JP2007122033A - Display device and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve color reproduction range in a display device having light-emitting elements. <P>SOLUTION: The display device is configured as follows; a display area has a plurality of picture elements each of which includes: first and second pixels each of which includes a light-emitting element having a chromaticity whose x-coordinate in a CIE-XY chromaticity diagram is 0.50 or more; third and fourth pixels each of which includes a light-emitting element having a chromaticity whose y-coordinate in the diagram is 0.55 or more; and fifth and sixth pixels each of which includes a light-emitting element having a chromaticity whose x-coordinate and y-coordinate in the diagram are 0.20 or less and 0.25 or less respectively. The light-emitting elements in the first and second pixels have different emission spectrums from each other, and the light-emitting elements in the third and fourth pixels have different emission spectrums from each other, and the light-emitting elements in the fifth and sixth pixels have different emission spectrums from each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display device including a light emitting element or an electro-optical element in a pixel. In particular, the present invention relates to a display device in which a light-emitting element includes a layer containing an organic material, a fluorescent material, or a phosphorescent material.

  Development of a display device using a light-emitting element that has a layer containing an organic material between a pair of electrodes and emits light by passing a current between the electrodes is in progress. Such a display device is advantageous in reducing the thickness and weight, and since it is self-luminous, it has good visibility and quick response. In addition, there is a possibility that the power consumption can potentially be very small, and it is actively developed as a next-generation display device, and partly put into practical use.

In a display device using the light-emitting element having the above structure, improvement in high image quality and wide color gamut is desired. For example, there is a strong demand for the development of a display device that can accurately reproduce and display colors, such as editing in printing operations, viewing of works such as arts and movies, and accurate grasp of real colors in telemedicine. Therefore, in order to improve the color gamut visually recognized by human eyes, studies have been made on optimizing the structure such as improvement of color purity and wide color gamut (see, for example, Patent Document 1).
JP 2001-039554 A

  However, there is still a surplus in the color gamut visually recognized by human eyes, and the color reproduction range on the current display device is still insufficient. FIG. 39 is a CIE-XY chromaticity diagram defined by the International Commission on Illumination (CIE), which manages color standards internationally. In the outer periphery of the figure, the vicinity of the rightmost edge corresponds to an emission spectrum of red monochromatic light of 700 nm, the vicinity of the uppermost edge corresponds to an emission spectrum of green monochromatic light of 546.1 nm, and the vicinity of the lowermost edge corresponds to an emission spectrum of blue monochromatic light of 435.8 nm. In this chromaticity diagram, the outer periphery of the graph (visible region) corresponds to a monochromatic light on the emission spectrum, and the inner side corresponds to a mixed color formed by combining monochromatic light, so the vividness (saturation) decreases as it goes inward. . When a color is expressed by additive color mixing, a plurality of reference colors can reproduce only the color of the portion surrounded by the polygon formed by the points shown in the CIE-XY chromaticity diagram.

  When expressed in the CIE-XY chromaticity diagram, red (R) indicates a color having coordinates in the region near the right side of the chromaticity diagram (the region surrounded by the dotted line 3901 and the periphery of the chromaticity diagram in FIG. 39). The human eye can feel red. Green (G) has coordinates in a region near the upper side of the chromaticity diagram (a region surrounded by a dotted line 3902 and the periphery of the chromaticity diagram in FIG. 39) when represented by a CIE-XY chromaticity diagram. The human eye can feel the color as green. Blue (B) is a region near the lower side of the chromaticity diagram when the CIE-XY chromaticity diagram is represented (in FIG. 39, the region surrounded by the dotted line 3903 and the dotted line 3904). A human eye can perceive a color having coordinates as blue. As a specific example, the chromaticity coordinates of the high-definition (high-definition television broadcast; HDTV) standard are R (x = 0.67, y = 0.33), G (x = 0.21, y = 0.71) and B (x = 0.14, y = 0.08) (triangle 3905 in FIG. 39).

  According to the method described in Patent Document 1, by increasing the color purity, the color reproduction range can be expanded in the direction of the arrow in FIG. 39, and the vividness of the color recognized by human eyes increases. However, there is still a surplus in the color gamut that can be recognized by human eyes, and by satisfying this, it becomes a problem to widen the color reproduction range.

  Therefore, the present invention solves the above-described problems in a display device including a light emitting element, and improves the color reproduction range and widens the color gamut visually recognized by human eyes.

  One display device of the present invention has a display area having a plurality of picture elements, and when the picture elements are represented by a CIE-XY chromaticity diagram, x in the CIE-XY chromaticity diagram is 0.50 or more. A first pixel and a second pixel each having a light-emitting element having coordinates in the region, and a third pixel having a light-emitting element having coordinates in a region where y in the CIE-XY chromaticity diagram is 0.55 or more. And the fourth pixel, and the fifth pixel and the sixth pixel each having a light emitting element having coordinates in a region where x is 0.20 or less and y is 0.25 or less in the CIE-XY chromaticity diagram. The light emitting element provided in the first pixel and the light emitting element provided in the second pixel have emission spectra different from each other, and the light emitting element provided in the third pixel and the fourth pixel are provided. The light emitting elements provided in the light emitting elements provided in the fifth pixel have emission spectra different from each other. When the light-emitting element provided in the pixel of the sixth, a structure having a different emission spectrum from each other.

  Another display device of the present invention has a display area having a plurality of picture elements. When the picture elements are represented by a CIE-XY chromaticity diagram, x in the CIE-XY chromaticity diagram is 0. A first pixel and a second pixel having a light emitting element having coordinates in a region of 50 or more, and a third pixel having a light emitting element having a coordinate in a region where y of the chromaticity diagram is 0.55 or more And a fourth pixel, and a fifth pixel and a sixth pixel each having a light emitting element having coordinates in a region where x in the chromaticity diagram is 0.20 or less and y is 0.25 or less. In the CIE-XY chromaticity diagram, the light emitting element provided in the first pixel and the light emitting element provided in the second pixel emit light in colors different from each other and are provided in the third pixel. In the CIE-XY chromaticity diagram, the light emitting elements provided in the light emitting element and the fourth pixel are different in color from each other. Light and the light-emitting element provided in the light emitting element and a pixel of the 6 provided on the fifth pixel is the CIE-XY chromaticity diagram, a configuration in which light emission coordinates in different colors.

  Another display device of the present invention has a display area having a plurality of picture elements. When the picture elements are represented by a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.50 or more. A first pixel and a second pixel each having a light emitting element having coordinates in the region, and a third pixel and a fourth pixel having light emitting elements having a coordinate in the region where y in the chromaticity diagram is 0.55 or more. And a fifth pixel and a sixth pixel having light emitting elements having coordinates in a region where x is 0.20 or less and y is 0.25 or less in the chromaticity diagram, The light emitting element provided in one pixel and the light emitting element provided in the second pixel are made of different materials and have emission spectra different from each other, and the light emitting element provided in the third pixel The light emitting elements provided in the fourth pixel are made of different materials and have different light emission spectra. Having Le, light-emitting element provided in the light emitting element and a pixel of the 6 provided on the fifth pixel is composed of different materials, and configured to have different emission spectrums.

  Another display device of the present invention has a display area having a plurality of picture elements. When the picture elements are represented by a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.50 or more. A first pixel and a second pixel each having a light emitting element having coordinates in the region, and a third pixel and a fourth pixel having light emitting elements having a coordinate in the region where y in the chromaticity diagram is 0.55 or more. And a fifth pixel and a sixth pixel having light emitting elements having coordinates in a region where x is 0.20 or less and y is 0.25 or less in the chromaticity diagram, The light-emitting element provided in one pixel and the light-emitting element provided in the second pixel have different film thicknesses from each other and have different emission spectra, and the light-emitting element provided in the third pixel The light emitting elements provided in the fourth pixel have different film thicknesses and different emission spectra. A light emitting element provided on the light emitting element and a pixel of the 6 provided on the fifth pixel is different thickness from each other, and configured to have different emission spectrums.

  Another display device of the present invention has a display area having a plurality of picture elements. When the picture elements are represented by a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.50 or more. A first pixel and a second pixel each having a light emitting element having coordinates in the region, and a third pixel and a fourth pixel having light emitting elements having a coordinate in the region where y in the chromaticity diagram is 0.55 or more. And a fifth pixel and a sixth pixel having light emitting elements having coordinates in a region where x is 0.20 or less and y is 0.25 or less in the chromaticity diagram, The first pixel and the second pixel have color filters having different transmission characteristics and transmit light having different emission spectra, and the third pixel and the fourth pixel have different transmission characteristics. And transmit light having emission spectra different from each other, and a fifth pixel, a sixth pixel, Pixel includes a color filter transmission characteristics are different from each other, and a configuration that transmits light in different emission spectrums.

  Another display device of the present invention has a display area having a plurality of picture elements. When the picture elements are represented by a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.50 or more. A first pixel and a second pixel each having a light emitting element having coordinates in the region, and a third pixel and a fourth pixel having light emitting elements having a coordinate in the region where y in the chromaticity diagram is 0.55 or more. And a fifth pixel and a sixth pixel having light emitting elements having coordinates in a region where x is 0.20 or less and y is 0.25 or less in the chromaticity diagram, The light-emitting element provided in one pixel and the light-emitting element provided in the second pixel are made of different materials, and emit light with colors having different coordinates in the CIE-XY chromaticity diagram. The light emitting element provided in the pixel and the light emitting element provided in the fourth pixel are made of different materials, and In the CIE-XY chromaticity diagram, light is emitted in colors different from each other, and the light-emitting element provided in the fifth pixel and the light-emitting element provided in the sixth pixel are made of different materials, and CIE In the -XY chromaticity diagram, light is emitted with colors having different coordinates.

  Another display device of the present invention has a display area having a plurality of picture elements. When the picture elements are represented by a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.50 or more. A first pixel and a second pixel each having a light emitting element having coordinates in the region, and a third pixel and a fourth pixel having light emitting elements having a coordinate in the region where y in the chromaticity diagram is 0.55 or more. And a fifth pixel and a sixth pixel having light emitting elements having coordinates in a region where x is 0.20 or less and y is 0.25 or less in the chromaticity diagram, The light-emitting element provided in one pixel and the light-emitting element provided in the second pixel have different film thicknesses, and emit light with colors having different coordinates in the CIE-XY chromaticity diagram. The light-emitting elements provided in the pixels and the light-emitting elements provided in the fourth pixel have different film thicknesses, and C In the E-XY chromaticity diagram, light is emitted in colors different from each other. The light-emitting elements provided in the fifth pixel and the light-emitting elements provided in the sixth pixel have different film thicknesses from each other and CIE. In the -XY chromaticity diagram, light is emitted with colors having different coordinates.

  Another display device of the present invention has a display area having a plurality of picture elements. When the picture elements are represented by a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.50 or more. A first pixel and a second pixel each having a light emitting element having coordinates in the region, and a third pixel and a fourth pixel having light emitting elements having a coordinate in the region where y in the chromaticity diagram is 0.55 or more. And a fifth pixel and a sixth pixel having light emitting elements having coordinates in a region where x is 0.20 or less and y is 0.25 or less in the chromaticity diagram, The first pixel and the second pixel have color filters having different transmission characteristics, and light transmitted through the color filter has colors having different coordinates in the CIE-XY chromaticity diagram. The pixel and the fourth pixel have color filters having different transmission characteristics from each other, and The light transmitted through the color filter is a color having different coordinates in the CIE-XY chromaticity diagram, and the fifth pixel and the sixth pixel have color filters having different transmission characteristics, and the color filter. The light that has passed through has a configuration in which the coordinates are different from each other in the CIE-XY chromaticity diagram.

  In addition, when the light-emitting element included in the first pixel or the light-emitting element included in the second pixel is represented by a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.6 or more, y Has a coordinate in an area of 0.35 or less, and the light-emitting element included in the third pixel or the light-emitting element included in the fourth pixel has a color when represented by a CIE-XY chromaticity diagram. The coordinates in the region where x is 0.3 or less and y is 0.6 or more in the degree diagram, and either the light emitting element included in the fifth pixel or the light emitting element included in the sixth pixel is CIE- When expressed in an XY chromaticity diagram, the chromaticity diagram may have a configuration in which coordinates are in a region where x is 0.15 or less and y is 0.2 or less.

  Further, the picture element may be configured to include a light emitting element that emits white light.

  The first pixel and the second pixel, the third pixel and the fourth pixel, and the fifth pixel and the sixth pixel may include light emitting regions having different areas.

  As the light-emitting element, an electroluminescence (EL) element (an organic EL element, an inorganic EL element, or an EL element containing an organic substance and an inorganic substance) can be used.

Note that the region in the CIE-XY chromaticity diagram in this specification refers to a region representing visible light that can be recognized by the human eye in the CIE-XY chromaticity diagram.

Note that a variety of switches can be used as a switch described in this specification, and examples thereof include an electrical switch and a mechanical switch. In other words, any device can be used as long as it can control the flow of current, and it is not limited to a specific device, and various devices can be used. For example, it may be a transistor, a diode (for example, a PN diode, a PIN diode, a Schottky diode, a diode-connected transistor, or the like), a thyristor, or a logic circuit that combines them. Therefore, when a transistor is used as a switch, the transistor operates as a mere switch, and thus the polarity (conductivity type) of the transistor is not particularly limited. However, when it is desirable that the off-state current is small, it is desirable to use a transistor having a polarity with a small off-state current. As a transistor with low off-state current, there are a transistor provided with an LDD region and a transistor having a multi-gate structure. Further, when the transistor operated as a switch operates at a source terminal potential close to a low potential power source (Vss, GND, 0 V, etc.), the N-channel type is used. On the contrary, the source terminal potential is a high potential. When operating in a state close to the side power supply (Vdd or the like), it is desirable to use a P-channel type. This is because the absolute value of the gate-source voltage can be increased, and the operation as a switch is easy.

  Note that both N-channel and P-channel switches may be used as CMOS switches. When a CMOS switch is used, a current can flow when either the P-channel switch or the N-channel switch is turned on, so that the switch can easily function as a switch. For example, the voltage can be appropriately output regardless of whether the voltage of the input signal to the switch is high or low. In addition, since the voltage amplitude value of the signal for turning on / off the switch can be reduced, the power consumption can be reduced.

  Note that in the case where a transistor is used as a switch, the transistor has an input terminal (one of a source terminal or a drain terminal), an output terminal (the other of the source terminal or the drain terminal), and a terminal for controlling conduction (a gate terminal). Yes. On the other hand, when a diode is used as a switch, it may not have a terminal for controlling conduction. Therefore, the wiring for controlling the terminals can be reduced.

Note that in this specification, “connected” includes a case of being electrically connected, a case of being functionally connected, and a case of being directly connected. Therefore, the structure disclosed in this specification includes things other than the predetermined connection relation. For example, one or more elements (for example, a switch, a transistor, a capacitor, an inductor, a resistor, a diode, or the like) that can be electrically connected may be arranged between a certain portion. In addition, a circuit (for example, a logic circuit (an inverter, a NAND circuit, a NOR circuit, etc.), a signal conversion circuit (a DA conversion circuit, an AD conversion circuit, a gamma correction circuit, etc.) or a potential level conversion circuit ( Power supply circuits such as booster circuits and step-down circuits, level shifter circuits that change the potential level of H and L signals, etc., voltage sources, current sources, switching circuits, and amplifier circuits (op amps, differential amplifier circuits, source follower circuits, and buffer circuits) Etc.), or a signal generation circuit, a memory circuit, a control circuit, etc.) may be disposed between them. Alternatively, they may be arranged directly connected without interposing other elements or other circuits therebetween.

  In addition, when only including the case where it is connected without interposing an element or a circuit, it shall be described as being directly connected. In addition, when it is described as being electrically connected, when it is electrically connected (that is, when connected with another element in between) and when it is functionally connected (That is, connected with another circuit in between) and directly connected (that is, connected without another element or circuit in between). .

Note that in this specification, various types of transistors can be used as a transistor. Thus, there is no limitation on the type of applicable transistor. Therefore, for example, a thin film transistor (TFT) including a non-single-crystal semiconductor film typified by amorphous silicon or polycrystalline silicon can be used. As a result, they can be manufactured even at a low manufacturing temperature, can be manufactured at low cost, can be manufactured on a large substrate, can be manufactured on a transparent substrate, and light can be transmitted through a transistor. Alternatively, a semiconductor substrate, an SOI substrate, or the like can be used. Further, a MOS transistor, a junction transistor, a bipolar transistor, or the like can be applied. Accordingly, a transistor with little variation can be manufactured, a transistor with high current supply capability can be manufactured, a transistor with a small size can be manufactured, and a circuit with low power consumption can be configured. In addition, a transistor including a compound semiconductor such as ZnO, a-InGaZnO, SiGe, or GaAs, or a thin film transistor obtained by thinning them can be used. Accordingly, the transistor can be manufactured even at a low manufacturing temperature, can be manufactured at room temperature, or a transistor can be directly formed on a substrate having low heat resistance, such as a plastic substrate or a film substrate. In addition, a transistor formed using an inkjet method or a printing method can be used. By these, it can manufacture at room temperature, can manufacture in a state with a low degree of vacuum, or can manufacture with a large sized board | substrate. Further, since the transistor can be manufactured without using a mask (reticle), the layout of the transistor can be easily changed. In addition, a transistor including an organic semiconductor or a carbon nanotube, or another transistor can be used. Thus, a transistor can be formed over a substrate that can be bent. Note that the non-single-crystal semiconductor film may contain hydrogen or halogen. Various types of substrates on which transistors are formed can be used and are not limited to specific types. Therefore, for example, a single crystal substrate, an SOI substrate, a glass substrate, a quartz substrate, a plastic substrate, a paper substrate, a cellophane substrate, a stone substrate, a stainless steel substrate, a stainless steel substrate, a foil substrate, or the like can be formed. Alternatively, a transistor may be formed using a certain substrate, and then the transistor may be moved to another substrate and placed on another substrate. As another substrate, a single crystal substrate, an SOI substrate, a glass substrate, a quartz substrate, a plastic substrate, a paper substrate, a cellophane substrate, a stone substrate, a stainless steel substrate, a stainless steel substrate, a foil substrate, or the like is used. be able to. By using these substrates, it is possible to form a transistor with good characteristics, to form a transistor with low power consumption, to make the device hard to break, or to have heat resistance.

Note that the structure of the transistor can take a variety of forms. It is not limited to a specific configuration. For example, a multi-gate structure having two or more gate electrodes may be used. When the multi-gate structure is used, the channel regions are connected in series, so that a plurality of transistors are connected in series. The multi-gate structure reduces the off current, improves the breakdown voltage of the transistor to improve reliability, and even when the drain-source voltage changes when operating in the saturation region. The inter-current does not change so much, and flat characteristics can be achieved. Alternatively, a structure in which gate electrodes are arranged above and below the channel may be employed. By adopting a structure in which the gate electrodes are arranged above and below the channel, the channel region is increased, so that the current value can be increased or a depletion layer can be easily formed and the S value can be decreased. When gate electrodes are provided above and below a channel, a structure in which a plurality of transistors are connected in parallel is obtained.

  Further, a structure in which a gate electrode is disposed above a channel, a structure in which a gate electrode is disposed below a channel, a normal staggered structure, or an inverted staggered structure may be employed. The channel region may be divided into a plurality of regions, or the channel regions divided into the plurality of regions may be connected in parallel or may be connected in series. In addition, a source electrode or a drain electrode may overlap with the channel (or a part thereof). By using a structure in which a source electrode or a drain electrode overlaps with a channel (or part of it), it is possible to prevent electric charges from being accumulated in part of the channel and unstable operation. There may also be an LDD (Lightly Doped Drain) region. By providing an LDD region, the off-current can be reduced, the breakdown voltage of the transistor can be improved to improve reliability, or the drain-source voltage can be changed even when the drain-source voltage changes when operating in the saturation region. The current does not change so much, and a flat characteristic can be obtained.

Note that various types of transistors can be used in this specification, and the transistor can be formed over various substrates. Therefore, the entire circuit may be formed on a glass substrate, may be formed on a plastic substrate, may be formed on a single crystal substrate, or may be formed on an SOI substrate. Alternatively, it may be formed on any substrate. Since all the circuits are formed on the same substrate, the number of parts can be reduced to reduce the cost, and the number of connection points with circuit parts can be reduced to improve the reliability. Alternatively, a part of the circuit may be formed on a certain substrate, and another part of the circuit may be formed on another substrate. That is, all of the circuits may not be formed on the same substrate. For example, part of a circuit is formed using a transistor over a glass substrate, another part of the circuit is formed over a single crystal substrate, and the IC chip is connected with COG (Chip On Glass) to form a glass. You may arrange | position on a board | substrate. Alternatively, the IC chip may be connected to the glass substrate using TAB (Tape Automated Bonding) or a printed board. As described above, since a part of the circuit is formed on the same substrate, the number of parts can be reduced to reduce the cost, and the number of connection points with the circuit parts can be reduced to improve the reliability. In addition, since the power consumption increases in a portion where the drive voltage is high or a portion where the drive frequency is high, an improvement in power consumption can be prevented if such a portion is not formed on the same substrate.

Note that a transistor is an element having at least three terminals including a gate, a drain, and a source, and has a channel region between the drain region and the source region. Current can flow through the source region. Here, since the source and the drain vary depending on the structure and operating conditions of the transistor, it is difficult to limit which is the source or the drain. Therefore, in the present invention, a region functioning as a source and a drain may not be called a source or a drain. In that case, as an example, there are cases where they are referred to as a first terminal and a second terminal, respectively.

  Note that the transistor may be an element having at least three terminals including a base, an emitter, and a collector. Similarly in this case, the emitter and the collector may be referred to as a first terminal and a second terminal.

Note that a gate refers to the whole or part of a gate electrode and a gate wiring (also referred to as a gate line or a gate signal line). A gate electrode refers to a portion of a conductive film that overlaps with a semiconductor that forms a channel region, an LDD region, or the like with a gate insulating film interposed therebetween. The gate wiring refers to wiring for connecting between the gate electrodes of each pixel or connecting the gate electrode to another wiring.

However, there is a portion that functions as a gate electrode and also functions as a gate wiring. Such a region may be called a gate electrode or a gate wiring. That is, there is a region where the gate electrode and the gate wiring cannot be clearly distinguished. For example, when there is a channel region that overlaps with an extended gate wiring, the region functions as a gate wiring, but also functions as a gate electrode. Therefore, such a region may be called a gate electrode or a gate wiring.

A region formed of the same material as the gate electrode and connected to the gate electrode may also be called a gate electrode. Similarly, a region formed of the same material as the gate wiring and connected to the gate wiring may be called a gate wiring. In a strict sense, such a region may not overlap with the channel region or may not have a function of being connected to another gate electrode. However, there is a region that is formed of the same material as the gate electrode and the gate wiring and connected to the gate electrode and the gate wiring due to a manufacturing process and the like. Therefore, such a region may also be called a gate electrode or a gate wiring.

For example, in a multi-gate transistor, the gate electrode of one transistor and the gate electrode of another transistor are often connected by a conductive film formed using the same material as the gate electrode. Such a region is a region for connecting the gate electrode and the gate electrode, and may be referred to as a gate wiring. However, a multi-gate transistor can be regarded as a single transistor, and thus the gate electrode You can call it. That is, what is formed of the same material as the gate electrode and the gate wiring and is connected to the gate electrode and the gate wiring may be called a gate electrode and a gate wiring.

For example, a portion of the conductive film that connects the gate electrode and the gate wiring may also be called a gate electrode or a gate wiring.

Note that a gate terminal refers to a part of a region of a gate electrode or a region electrically connected to the gate electrode.

Note that a source refers to the whole or part of a source region, a source electrode, and a source wiring (also referred to as a source line, a source signal line, or the like). The source region refers to a semiconductor region containing a large amount of P-type impurities (such as boron and gallium) and N-type impurities (such as phosphorus and arsenic). Therefore, a region containing a little P-type impurity or N-type impurity, that is, a so-called LDD (Lightly Doped Drain) region is not included in the source region. A source electrode refers to a portion of a conductive layer which is formed using a material different from that of a source region and is electrically connected to the source region. However, the source electrode may be referred to as a source electrode including the source region. The source wiring is a wiring for connecting between the source electrodes of each pixel or connecting the source electrode and another wiring.

However, there is a portion that functions as a source electrode and also functions as a source wiring. Such a region may be called a source electrode or a source wiring. That is, there is a region where the source electrode and the source wiring cannot be clearly distinguished. For example, when there is a source region that overlaps with an extended source wiring, the region functions as a source wiring, but also functions as a source electrode. Therefore, such a region may be called a source electrode or a source wiring.

A region formed of the same material as the source electrode and connected to the source electrode, or a portion connecting the source electrode and the source electrode may also be referred to as a source electrode. A portion overlapping with the source region may also be called a source electrode. Similarly, a region formed of the same material as the source wiring and connected to the source wiring may be called a source wiring. In a strict sense, such a region may not have a function of connecting to another source electrode. However, there is a region formed of the same material as the source electrode and the source wiring and connected to the source electrode and the source wiring because of a manufacturing process. Therefore, such a region may also be called a source electrode or a source wiring.

For example, a portion of the conductive film that connects the source electrode and the source wiring may be called a source electrode or a source wiring.

Note that a source terminal refers to a part of a source region, a source electrode, or a region electrically connected to the source electrode.

The drain is the same as the source.

Note that in this specification, a semiconductor device refers to a device having a circuit including a semiconductor element (such as a transistor or a diode). In addition, any device that can function by utilizing semiconductor characteristics may be used.

  A display device refers to a device having a display element (such as a liquid crystal element or a light-emitting element). Note that a display panel body in which a plurality of pixels including display elements such as a liquid crystal element and an EL element and peripheral drive circuits for driving these pixels are formed over the same substrate may be used. Further, it may include a peripheral drive circuit, so-called chip on glass (COG), which is disposed on the substrate by wire bonding or bumps. Furthermore, a device to which a flexible printed circuit (FPC) or a printed wiring board (PWB) is attached (such as an IC, a resistor, a capacitor, an inductor, or a transistor) may also be included. Furthermore, an optical sheet such as a polarizing plate or a retardation plate may be included. Furthermore, a backlight unit (which may include a light guide plate, a prism sheet, a diffusion sheet, a reflection sheet, and a light source (such as an LED or a cold cathode tube)) may be included. A light-emitting device refers to a display device including a self-luminous display element such as an EL element or an element used in an FED. A liquid crystal display device refers to a display device having a liquid crystal element.

Note that the display element, the display device, the light-emitting element, and the light-emitting device can have various forms or have various elements. For example, as a display element, a display device, a light emitting element, and a light emitting device, an EL element (an organic EL element, an inorganic EL element, or an EL element containing an organic substance and an inorganic substance), an electron emitting element, a liquid crystal element, electronic ink, a grating light valve ( GLV), plasma display (PDP), digital micromirror device (DMD), piezoelectric ceramic display, carbon nanotube, and other display media whose contrast is changed by an electromagnetic action can be applied. Note that a display device using an EL element is an EL display, and a display device using an electron-emitting device is a liquid crystal display such as a field emission display (FED) or a SED type flat display (SED: Surface-conduction Electron-Emitter Display). A display device using the element includes a liquid crystal display, a transmissive liquid crystal display, a transflective liquid crystal display, a reflective liquid crystal display, and a display device using electronic ink includes electronic paper.

In addition, in this specification, it is formed on a certain thing, or it is formed on the top. It is not limited to being in direct contact with the top. This includes cases where they are not in direct contact, that is, cases where another object is sandwiched between them. Therefore, for example, when the layer B is formed on the layer A (or on the layer A), the case where the layer B is formed in direct contact with the layer A and the case where the layer B is formed In which another layer (for example, layer C or layer D) is formed in direct contact with layer B and layer B is formed in direct contact therewith. The same applies to the description of “above”, and it is not limited to being in direct contact with a certain object, and includes a case where another object is sandwiched therebetween. Therefore, for example, when the layer B is formed above the layer A, the case where the layer B is formed in direct contact with the layer A and the case where another layer is formed in direct contact with the layer A. (For example, the layer C or the layer D) is formed, and the layer B is formed in direct contact therewith. It should be noted that the same applies to the case of below or below, and includes the case of direct contact and the case of no contact.

  By using the present invention, a display device using a light-emitting element can be provided with an improved color reproduction range on the CIE-XY chromaticity diagram. In other words, a display device capable of expressing vivid colors can be provided.

  Hereinafter, embodiments and examples of the present invention will be described with reference to the drawings. However, the present invention can be implemented in many different modes, and those skilled in the art can easily understand that the modes and details can be variously changed without departing from the spirit and scope of the present invention. Is done. Therefore, the present invention is not construed as being limited to the description of this embodiment mode. Note that in the drawings described below, the same portions or portions having similar functions are denoted by the same reference numerals, and repetitive description thereof is omitted.

(Embodiment 1)
(Configuration of display device of this embodiment)
FIG. 1 is a block diagram showing an example of the configuration of the display device of the present invention. Reference numeral 100 denotes a pixel portion in which a plurality of pixels 101 are arranged in a matrix, and this configuration is called an active matrix system. Reference numeral 102 denotes a signal line driver circuit, and 103 denotes a scanning line driver circuit.

  In FIG. 1, the signal line driver circuit 102 and the scanning line driver circuit 103 are formed over the same substrate as the pixel portion 100; however, the present invention is not limited to this structure. The signal line driver circuit 102 and the scanning line driver circuit 103 may be formed over a different substrate from the pixel unit 100 and connected to the pixel unit 100 via a connector such as an FPC (flexible printed wiring board). As a method for mounting the FPC, a connection method using an anisotropic conductive material or a metal bump, or a wire bonding method can be adopted. In FIG. 1, one signal line driver circuit 102 and one scanning line driver circuit 103 are provided, but the present invention is not limited to this structure. The number of the signal line driver circuits 102 and the scanning line driver circuits 103 can be arbitrarily set by a designer.

Note that in this specification, a pixel includes a color element that forms one image and includes a light-emitting element and an element that drives the light-emitting element (for example, a circuit including a transistor). In this specification, a picture element is assumed to include a pixel constituting a color element for displaying one minimum image. Therefore, in the case of a full-color display device composed of R (red), G (green), and B (blue) color elements, a picture element is composed of pixels including R color elements, G color elements, and B color elements. It is assumed that In addition, a pixel having a plurality of pixels is referred to as a first pixel and a second pixel in this order. Each pixel may have a different area size.

  In this specification, connection means an electrical connection unless otherwise specified. On the contrary, the disconnection means a state in which the connection is not established and the connection is electrically separated.

  In FIG. 1, the pixel portion 100 is provided with signal lines S1 to Sn, power supply lines V1 to Vn, and scanning lines G1 to Gm. Note that the number of signal lines and power supply lines is not necessarily the same. Further, it is not always necessary to have all of these wirings, and other different wirings may be provided in addition to these wirings.

  The signal line driver circuit 102 may be any circuit that can supply the input video signal to the signal lines S1 to Sn. Specifically, in this embodiment, as an example, the signal line driver circuit 102 includes a shift register 102a, a first latch circuit 102b, and a second latch circuit 102c. Note that the signal line driver circuit 102 of the display device of the present invention is not limited to the above structure. Further, it may be a signal line driver circuit corresponding to a digital video signal (also referred to as a digital video signal or a video signal), or an analog video signal (analog video) using a D / A (digital-analog) conversion circuit. (Signal) output signal line drive circuit may be used. Further, depending on the structure of the display device, a structure having a level shifter circuit, a buffer circuit, or the like may be used.

  The scanning line driving circuit 103 may be any circuit that can input signals to the scanning lines G1 to Gm in order to select pixels in the pixel portion. Specifically, in this embodiment, the scan line driver circuit 103 includes a shift register circuit. Further, depending on the structure of the display device, a structure having a buffer circuit and a level shifter circuit may be used. Moreover, there may be no latch circuit and it may be constituted by a shift register and a sampling switch.

  In addition, a signal such as a clock signal (S_CLK), a clock inversion signal (S_CLKB), a start pulse signal (S_SP), a digital video signal (Digital Video Data), a latch signal (Latch Signal), or the like is input to the signal line driver circuit 102. Is done. And according to those signals, the video signal according to the pixel of each column is output to each signal line S1-Sn. Note that an analog video signal may be input.

  In addition, a signal such as a clock signal (G_CLK), a clock inversion signal (G_CLKB), a start pulse signal (G_SP), or the like is input to the scan line driver circuit 103. And according to those signals, the signal which selects a pixel is output to the scanning line Gi (any one among 1st scanning lines G1-Gm) of the pixel row to select.

  Therefore, the video signals input to the signal lines S1 to Sn are each column of the pixel row selected by the signal input from the scanning line driving circuit 103 to the scanning line Gi (any one of the scanning lines G1 to Gm). Is written in the pixel 101. And each pixel row is selected by each scanning line G1-Gm, and the video signal corresponding to each pixel is written in all the pixels. Each pixel holds the written video signal for a certain period. Each pixel can maintain a state such as lighting by holding the video signal for a certain period.

  Although the display device using the light-emitting element shown in FIG. 1 has been described with respect to the driving method based on the active matrix method, it is not limited to this. In the present invention, a simple matrix (passive) method may be adopted. The active matrix method shown in FIG. 1 includes a control circuit having several switching thin film transistors in each pixel, and the light emission / non-light emission of each pixel is controlled by the control circuit of each pixel. On the other hand, in a simple matrix display device, a plurality of column signal lines and a plurality of row signal lines are arranged so as to intersect each other, and light emitting elements are sandwiched between the intersections. Therefore, a potential difference is generated in a region sandwiched between the selected row signal line and the column signal line that performs output, and the light emitting element emits light when a current flows.

  FIG. 46 shows a structure of a passive display device. FIG. 46 includes a column signal line driver circuit 4601, a row signal line driver circuit 4602, and a pixel portion 4603. The pixel portion 4603 is provided with column signal lines S1 to Sn and row signal lines V1 to Vn, and a plurality of light emitting elements 4604 are provided between the column signal lines and the row signal lines. When the passive method is adopted, the configuration of the present invention can be simplified as compared with the case where the active matrix method is adopted, which is preferable in this respect.

The configuration of the display device as described above can be employed in the present invention.

(Pixel configuration of this embodiment)
FIG. 2 shows a detailed configuration of the pixel portion of the present invention shown in FIG. In FIG. 2, a first pixel 201, a second pixel 202, a third pixel 203, a fourth pixel 204, a fifth pixel 205, and a sixth pixel 206 correspond to the pixel 101 in FIG. In addition, the first to sixth pixels are combined to form a picture element 200 that displays one minimum image. Each of the first pixel 201, the second pixel 202, the third pixel 203, the fourth pixel 204, the fifth pixel 205, and the sixth pixel 206 is provided with a light-emitting element. The pixel is the light emitting element R1, the second pixel is the light emitting element R2, the third pixel is the light emitting element G1, the fourth pixel is the light emitting element G2, the fifth pixel is the light emitting element B1, and the sixth pixel is the sixth pixel. A light emitting element B2 is connected to each pixel.

  Here, in the present specification, when the light emitting element R1 of the first pixel and the light emitting element R2 of the second pixel are expressed in a CIE-XY chromaticity diagram, x in the chromaticity diagram is in an area of 0.50 or more. It shall have coordinates. Further, the light emitting element G1 of the third pixel and the light emitting element G2 of the fourth pixel have coordinates in a region where y in the chromaticity diagram is 0.55 or more when represented by the CIE-XY chromaticity diagram. And In the light emitting element B1 of the fifth pixel and the light emitting element B2 of the sixth pixel, when the CIE-XY chromaticity diagram is expressed, x in the chromaticity diagram is 0.20 or less and y is 0.35 or less. It is assumed that the area has coordinates. More preferably, any of the light emitting element R1 of the first pixel and the light emitting element R2 of the second pixel has a chromaticity diagram x of 0.6 or more when represented by a CIE-XY chromaticity diagram. , Y has coordinates in the region of 0.35 or less. More preferably, when any of the light emitting element G1 of the third pixel and the light emitting element G2 of the fourth pixel is represented by a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.3 or less, It is assumed that y has coordinates in a region where 0.6 or more. More preferably, when any of the light emitting element B1 of the fifth pixel and the light emitting element B2 of the sixth pixel represents the CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.15 or less, It is assumed that the coordinates are in a region where y is 0.2 or less.

In the present invention, the absolute value _{G 12} of the difference between the coordinates of the CIE-XY chromaticity diagram of the light-emitting element G1 and G2 (x, distance y coordinates) is, CIE between the light emitting element R1 and the light-emitting element R2 it is preferably larger than the absolute value _{B 12} of the absolute value coordinates of the difference between CIE-XY chromaticity diagram between _{R 12} or light-emitting element B1 and the light-emitting element B2 of the difference between the coordinates of -XY chromaticity diagram. By satisfying G ₁₂ > R ₁₂ and G ₁₂ > B ₁₂ , the color reproduction range can be improved, and the color gamut visually recognized by human eyes can be widened.

Note that the region in the CIE-XY chromaticity diagram in this specification refers to a region representing visible light that can be recognized by the human eye in the CIE-XY chromaticity diagram. That is, it corresponds to the inner region surrounded by the thick line in the CIE-XY chromaticity diagram shown in FIG.

  FIG. 3 shows a circuit configuration of the picture element 200 of the present invention shown in FIG. The first pixel 201, the second pixel 202, the third pixel 203, the fourth pixel 204, the fifth pixel 205, and the sixth pixel 206 illustrated in FIG. ), A scanning line Gi (one of G1 to Gm), and a power supply line Vi (one of V1 to Vn). The first pixel 201, the second pixel 202, the third pixel 203, the fourth pixel 204, the fifth pixel 205, and the sixth pixel 206 are each switched for controlling the input of the video signal. 1 transistor 301, a second transistor 302 for driving that determines light emission / non-light emission of the light emitting element according to the video signal, a light emitting element 303, and a storage capacitor 304. The storage capacitor 304 is provided in order to hold the voltage (gate voltage) between the gate and the source of the second transistor 302 more reliably, but is not necessarily provided. Note that the voltage in this specification means a potential difference from the ground unless otherwise specified. The light emitting element 303 corresponds to the light emitting elements R1, R2, G1, G2, B1, and B2 in FIG. 2, and each is connected to a circuit for driving each. In the configuration shown in FIG. 3, the same power supply line Vi is used to share power supply lines for supplying current to the light emitting element R1 and the light emitting element R2, the light emitting element G1 and the light emitting element G2, and the light emitting element B1 and the light emitting element B2. Possible. Since the light-emitting elements R1 and R2, the light-emitting elements G1 and G2, and the light-emitting elements B1 and B2 have almost the same hue, the power supply lines can be shared in this way, and as a result, the display This is preferable because the number of power supply lines arranged in the apparatus can be reduced. In FIG. 3, the power supply lines connected to the light emitting element R1 and the light emitting element R2, the light emitting element G1 and the light emitting element G2, and the light emitting element B1 and the light emitting element B2 are shown as separate wirings. It may be branched.

A configuration different from the configuration shown in FIG. 3 is shown in FIG. In FIG. 52, components having the same functions as those in FIG. As shown in FIG. 52, the light-emitting element R1 and the light-emitting element R2, the light-emitting element G1 and the light-emitting element G2, in a light-emitting element B1 and the light-emitting element B2 be configured to be connected to a different second power supply line Vi ₂ respectively Good. The voltage applied to each light emitting element can be controlled by making the power supply lines for supplying current different between the light emitting element R1 and the light emitting element R2, the light emitting element G1 and the light emitting element G2, and the light emitting element B1 and the light emitting element B2. This is preferable because the luminance can be freely changed.

  Here, FIG. 4 illustrates a driving method when the light emitting element 303 in FIG. 3 emits light. In FIG. 4, a circuit connected to the light emitting element 404 includes a switching first transistor 401 that controls input of a video signal, and a second driving transistor that determines the light emission intensity of the light emitting element based on the video signal. A transistor 402, a signal line 405, a power supply line 406, and a scanning line 407 are included. The gate of the first transistor 401 is connected to the scanning line 407. The first terminal and the second terminal of the first transistor 401 (one of which is a source and the other is a drain) are connected to the signal line 405 and the other is connected to the gate of the second transistor 402. It is connected. One of a first terminal and a second terminal of the second transistor 402 is connected to the power supply line 406 and the other is connected to a pixel electrode included in the light-emitting element 404. The light emitting element 404 includes an anode and a cathode. In this specification, when the anode is used as a pixel electrode, the cathode is called a counter electrode, and when the cathode is used as a pixel electrode, the anode is called a counter electrode. The voltage of the counter electrode is often kept at a constant height. The first transistor 401 and the second transistor 402 may be either an n-channel transistor or a p-channel transistor. When the anode is used as the pixel electrode and the cathode is used as the counter electrode, the second transistor 402 is preferably a p-channel transistor. On the other hand, when the anode is used as the counter electrode and the cathode is used as the pixel electrode, the second transistor 402 is preferably an n-channel transistor.

  One of the two electrodes of the storage capacitor 403 is connected to the gate of the second transistor. The other of the two electrodes of the storage capacitor 403 is connected to the power supply line 406. However, the present invention is not limited to this, and may be connected to another wiring. The storage capacitor 403 is provided to more reliably maintain the voltage (gate voltage) between the gate and the source of the second transistor 402. However, by substituting the gate capacitance of the second transistor 402, the storage capacitor 403 is not necessarily provided. There is no need to provide it.

  In FIG. 4, when the scan line 407 is selected in the writing period, the first transistor 401 whose gate is connected to the scan line 407 is turned on. Then, when the video signal input to the signal line 405 is input to the gate of the second transistor 402 through the first transistor 401, a current flows from the power supply line 406 to the light-emitting element 404. Emits light.

  Note that the pixel configuration is not limited to this. Various pixel configurations such as a method of correcting variation in threshold voltage of a transistor and a method of inputting a signal current to a pixel can be applied.

The pixel configuration as described above can be adopted in the present invention.

(Operation method of this embodiment)
In the circuit configuration shown in FIG. 4, the operation timing when displaying is described with reference to FIG. In the display device, the screen is repeatedly rewritten and displayed during the display period. The number of times of rewriting is generally set to about 60 times per second so that the viewer does not feel flicker. Here, a period in which a series of screen rewriting and display operations is performed once, that is, a period indicated by 501 in FIG. In this embodiment, as an example, a case where a 3-bit digital video signal is used in a digital time gray scale method will be described. In the digital time gray scale method, one frame period 501 is further divided into a plurality of subframe periods. Here, since it is 3 bits, it is divided into three subframe periods, and writing and display in each emission color are performed in each period.

Each subframe period has an address (writing) period Ta # (# is a natural number) and a sustain (light emission) period Ts #. In FIG. 5, the length of the sustain (light emission) period is Ts1: Ts2: Ts3 = 4: 2: 1, and light emission or non-light emission is controlled in each sustain (light emission) period, thereby 2 ³ = 8. Express gradation. That is, the length of the sustain (light emission) period is set to a power of 2 ratio such that Ts1: Ts2: Ts3 = 2 ^(n-1) : 2 ^(n-2) :...: 2 ¹ : 2 ⁰ And For example, when only Ts3 emits light and Ts1 and Ts2 do not emit light, light is emitted for only about 14% of all the sustain (light emission) periods. That is, a luminance of about 14% can be expressed. When Ts1 and Ts2 emit light and Ts3 does not emit light, light is emitted for only about 86% of all the sustain (light emission) periods. That is, a luminance of about 86% can be expressed.

  By this operation, R1, R2, G1, G2, B1, and B2 which are the light emitting elements 303 in FIG. 3 are respectively driven. As described above, the light emitting elements provided in the respective pixels in the picture element 200 of FIG. 3 are independently controlled in light emission time by the circuit connected to each light emitting element, and a desired display color can be obtained. Here, the display color refers to a color that can be visually recognized as a color in which light emission obtained from a plurality of light emitting elements having different light emission colors included in one pixel is combined and mixed.

  The driving method is not limited to this. An analog signal may be input to the gate of the first transistor, and the luminance of the light emitting element 404 may be changed in an analog manner accordingly.

The operation method as described above can be adopted in the present invention.

(Configuration of Light Emitting Element of the Present Invention)
Next, an example of a light-emitting element applicable to the display device of the present invention is shown in FIG.

6A, an anode 602 on a substrate 601, a hole injection layer 603 made of a hole injection material, a hole transport layer 604 made of a hole transport material thereon, a light emitting layer 605, an electron In this element structure, an electron transport layer 606 made of a transport material, an electron injection layer 607 made of an electron injection material, and a cathode 608 are stacked. Here, the light emitting layer 605 may be formed of only one type of light emitting material, but may be formed of two or more types of materials. Further, the structure of the light-emitting element of the present invention is not limited to this structure. Needless to say, a circuit or wiring for driving a light-emitting element including a transistor may be provided between the substrate 601 and the anode 602.

  In addition to the laminated structure in which the functional layers shown in FIG. 6A are laminated, an element using a polymer compound, a high-efficiency element using a triplet light emitting material that emits light from a triplet excited state in the light emitting layer, and the like. The variation is wide. The light-emitting element can be applied to a white light-emitting element obtained by controlling a carrier recombination region by a hole blocking layer and dividing the light-emitting region into two regions.

  6A, first, a hole injection material, a hole transport material, and a light emitting material are sequentially deposited on a substrate 601 having an anode 602 (ITO: indium tin oxide). Next, an electron transport material and an electron injection material are vapor-deposited, and finally a cathode 608 is formed by vapor deposition.

Note that a hole generation layer may be provided instead of the hole injection layer. Note that the hole generating layer is a layer that generates holes, and is composed of at least one substance selected from hole transporting substances, and a substance that exhibits electron acceptability with respect to the hole transporting substance. Can be formed by mixing. Here, as the hole transporting substance, a substance similar to the substance that can be used to form the hole transporting layer can be used. As the substance exhibiting electron accepting properties, metal oxides such as molybdenum oxide, vanadium oxide, ruthenium oxide, and rhenium oxide can be used.

  Next, materials suitable for the hole injection material, the hole transport material, the electron transport material, the electron injection material, and the light emitting material are listed below.

As a hole injection material, a phthalocyanine compound such as phthalocyanine (abbreviation: H2Pc) or copper phthalocyanine (CuPC), or a poly (ethylenedioxythiophene) / poly (styrenesulfonic acid) aqueous solution (PEDOT / PSS) Molecule and the like. A material whose ionization potential of the material used for the hole injection layer is relatively smaller than the ionization potential of the functional layer formed in contact with the hole injection layer on the opposite side of the electrode functioning as an anode is positive. A hole injection layer can be formed by selecting from substances having hole transportability.

  As a material most widely used as a hole transport material, 4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl (abbreviation: NPB), 4,4′-bis [N— (3-methylphenyl) -N-phenylamino] biphenyl (abbreviation: TPD), 4,4 ′, 4 ″ -tris (N, N-diphenylamino) triphenylamine (abbreviation: TDATA), 4,4 ′ , 4 ″ -tris [N- (3-methylphenyl) -N-phenylamino] triphenylamine (abbreviation: MTDATA), 4,4′-bis {N- [4- (N, N-di-m -Tolylamino) phenyl] -N-phenylamino} biphenyl (abbreviation: DNTPD), 1,3,5-tris [N, N-di (m-tolyl) amino] benzene (abbreviation: m-MTDAB), 4,4 ', 4' '-G Scan (N- carbazolyl) triphenylamine (abbreviation: TCTA), phthalocyanine (abbreviation: H2Pc), copper phthalocyanine (abbreviation: CuPc), or vanadyl phthalocyanine (abbreviation: VOPc), and the like. The hole transport layer may be a layer having a multilayer structure formed by combining two or more layers made of the substances described above.

  As an electron transporting material, tris (8-quinolinolato) aluminum (abbreviation: Alq3), tris (4-methyl-8-quinolinolato) aluminum (abbreviation: Almq3), bis (10-hydroxybenzo [h] -quinolinato) beryllium ( Abbreviations: BeBq2), bis (2-methyl-8-quinolinolato) -4-phenylphenolato-aluminum (abbreviation: BAlq), bis [2- (2-hydroxyphenyl) benzoxazolate] zinc (abbreviation: Zn ( BOX) 2), bis [2- (2-hydroxyphenyl) benzothiazolate] zinc (abbreviation: Zn (BTZ) 2) and the like, as well as 2- (4-biphenylyl) -5- (4-tert-butylphenyl)- 1,3,4-oxadiazole (abbreviation: PBD), 1,3-bis [5- (p-tert-butylphenyl) 1,3,4-oxadiazol-2-yl] benzene (abbreviation: OXD-7), 3- (4-biphenylyl) -4-phenyl-5- (4-tert-butylphenyl) -1,2, 4-triazole (abbreviation: TAZ), 3- (4-biphenylyl) -4- (4-ethylphenyl) -5- (4-tert-butylphenyl) -1,2,4-triazole (abbreviation: p-EtTAZ) )), Bathophenanthroline (abbreviation: BPhen), bathocuproin (abbreviation: BCP), 2,2 ′, 2 ″-(1,3,5-benzenetriyl) -tris (1-phenyl-1H-benzimidazole) (Abbreviation: TPBI), 4,4-bis (5-methylbenzoxazol-2-yl) stilbene (abbreviation: BzOs), and the like. The electron transport layer may be a layer having a multilayer structure formed by combining two or more layers made of the substances described above.

Examples of the electron injection material include inorganic substances such as alkali metals or alkaline earth metals, alkali metal fluorides, alkaline earth metal fluorides, alkali metal oxides, and alkaline earth metal oxides. In addition to inorganic substances, substances that can be used to form an electron transport layer such as BPhen, BCP, p-EtTAZ, TAZ, and BzOs are also more preferable than those used to form an electron transport layer. In addition, by selecting a substance having a high electron affinity, it can be used as a substance for forming an electron injection layer. That is, the electron injection layer can also be formed by selecting a substance having an electron transport property that has a relatively higher electron affinity in the electron injection layer than the electron affinity in the electron transport layer. .

  There is no particular limitation on the light-emitting substance as a light-emitting layer including a light-emitting material, and a substance that has favorable emission efficiency and can emit light with a desired emission wavelength may be selected and used. For example, to obtain red light emission, 4-dicyanomethylene-2-isopropyl-6- [2- (1,1,7,7-tetramethyljulolidin-9-yl) ethenyl] -4H-pyran ( Abbreviation: DCJTI), 4-dicyanomethylene-2-methyl-6- [2- (1,1,7,7-tetramethyljulolidin-9-yl) ethenyl] -4H-pyran (abbreviation: DCJT), 4 -Dicyanomethylene-2-tert-butyl-6- [2- (1,1,7,7-tetramethyljulolidin-9-yl) ethenyl] -4H-pyran (abbreviation: DCJTB), periflanthene, 2,5 -Dicyano-1,4-bis [2- (10-methoxy-1,1,7,7-tetramethyljulolidin-9-yl) ethenyl] benzene, etc., emission spectrum from 600 nm to 680 nm It can be used and a substance which exhibits emission with a peak. When green light emission is desired, N, N′-dimethylquinacridone (abbreviation: DMQd), coumarin 6, coumarin 545T, tris (8-quinolinolato) aluminum (abbreviation: Alq3), etc., emission spectrum from 500 nm to 550 nm A substance exhibiting light emission having the following peak can be used. When blue light emission is desired, 9,10-bis (2-naphthyl) -tert-butylanthracene (abbreviation: t-BuDNA), 9,9′-bianthryl, 9,10-diphenylanthracene (abbreviation) : DPA), 9,10-bis (2-naphthyl) anthracene (abbreviation: DNA), bis (2-methyl-8-quinolinolato) -4-phenylphenolato-gallium (abbreviation: BGaq), bis (2-methyl) A substance exhibiting light emission having a peak of an emission spectrum from 420 nm to 500 nm, such as -8-quinolinolato) -4-phenylphenolato-aluminum (abbreviation: BAlq), can be used. In addition to the substances that emit fluorescence described above, a substance that emits phosphorescence such as tris (2-phenylpyridine) iridium may be used.

  There is no particular limitation on a substance (also referred to as a host material) used for bringing the light-emitting substance into a dispersed state, and 4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl (abbreviation: α In addition to a compound having an arylamine skeleton such as —NPD), 4,4′-bis (N-carbazolyl) biphenyl (abbreviation: CBP), 4,4 ′, 4 ″ -tris (N-carbazolyl) triphenyl Carbazole derivatives such as amine (abbreviation: TCTA), bis [2- (2-hydroxyphenyl) pyridinato] zinc (abbreviation: Znpp2), bis [2- (2-hydroxyphenyl) benzoxazolate] zinc (abbreviation: Metal complexes such as Zn (BOX) 2) and tris (8-quinolinolato) aluminum (abbreviation: Alq3) can be used.

In addition, as illustrated in FIG. 6B, a light-emitting element in which layers are formed in the reverse order of FIG. 6A can be used. That is, a cathode 608 on the substrate 601, an electron injection layer 607 made of an electron injection material, an electron transport layer 606 made of an electron transport material thereon, a light emitting layer 605, a hole transport layer 604 made of a hole transport material, This is an element structure in which a hole injection layer 603 made of a hole injection material and an anode 602 are laminated.

In addition, in order to extract light emitted from the light emitting element, at least one of the anode and the cathode may be transparent. Then, a TFT and a light emitting element are formed on the substrate, and a top emission that extracts light emission from a surface opposite to the substrate, a bottom emission that extracts light emission from the surface on the substrate side, and a surface opposite to the substrate side and the substrate. The pixel structure of the present invention can be applied to a light emitting element having any emission structure.

The light-emitting element of the present invention can be manufactured by combining materials having functions as described above.

(Configuration of injection structure in display device of this embodiment)
Next, examples of a top emission structure, a bottom emission structure, and a dual emission structure of a light-emitting element applicable to the display device of the present invention are shown in FIGS.

A light-emitting element having a top emission structure will be described with reference to FIG.

A driving TFT 701 is formed over the substrate 700, a first electrode 702 is formed in contact with a source electrode of the driving TFT 701, and a light emitting layer 703 and a second electrode 704 are formed thereon.

The first electrode 702 is an anode of the light emitting element. The second electrode 704 is a cathode of the light emitting element. That is, a light emitting element is a portion where the light emitting layer 703 is sandwiched between the first electrode 702 and the second electrode 704.

Here, as a material used for the first electrode 702 functioning as an anode, a material having a high work function is preferably used. For example, in addition to a single layer film such as a titanium nitride film, a chromium film, a tungsten film, a Zn film, or a Pt film, a stack of a titanium nitride film and a film containing aluminum as a main component, a titanium nitride film and aluminum as a main component A three-layer structure of a film and a titanium nitride film can be used. Note that with a stacked structure, resistance as a wiring is low, good ohmic contact can be obtained, and a function as an anode can be obtained. By using a metal film that reflects light, an anode that does not transmit light can be formed.

A material used for the second electrode 704 functioning as a cathode is a material having a low work function (Al, Ag, Li, Ca, or an alloy thereof such as MgAg, MgIn, AlLi, CaF ₂ , or calcium nitride). A stack of a metal thin film and a transparent conductive film (ITO (indium tin oxide), indium zinc oxide (IZO), zinc oxide (ZnO), or the like) is preferably used. Thus, a cathode capable of transmitting light can be formed by using a thin metal thin film and a transparent conductive film having transparency.

In this manner, light from the light emitting element can be extracted to the upper surface as indicated by an arrow in FIG.

A light-emitting element having a bottom emission structure will be described with reference to FIG. Except for the emission structure, the light emitting element has the same structure as that shown in FIG.

Here, as a material used for the first electrode 702 functioning as an anode, a material having a high work function is preferably used. For example, a transparent conductive film such as an ITO (indium tin oxide) film or an indium zinc oxide (IZO) film can be used. By using a transparent conductive film having transparency, an anode capable of transmitting light can be formed.

A material used for the second electrode 704 functioning as a cathode is a material having a low work function (Al, Ag, Li, Ca, or an alloy thereof such as MgAg, MgIn, AlLi, CaF ₂ , or calcium nitride). A metal film can be used. Thus, by using a metal film that reflects light, a cathode that does not transmit light can be formed.

In this manner, light from the light emitting element can be extracted to the lower surface as indicated by an arrow in FIG.

A light-emitting element having a dual emission structure will be described with reference to FIG. Except for the emission structure, the light emitting element has the same structure as that shown in FIG.

Here, as a material used for the first electrode 702 functioning as an anode, a material having a high work function is preferably used. For example, a transparent conductive film such as an ITO (indium tin oxide) film or an indium zinc oxide (IZO) film can be used. By using a transparent conductive film having transparency, an anode capable of transmitting light can be formed.

A material used for the second electrode 704 functioning as a cathode is a material having a low work function (Al, Ag, Li, Ca, or an alloy thereof such as MgAg, MgIn, AlLi, CaF ₂ , or calcium nitride). A stack of a metal thin film and a transparent conductive film (ITO (indium tin oxide), indium zinc oxide alloy (In ₂ O ₃ —ZnO), zinc oxide (ZnO), or the like) is preferably used. Thus, a cathode capable of transmitting light can be formed by using a thin metal thin film and a transparent conductive film having transparency.

In this manner, light from the light emitting element can be extracted on both sides as indicated by arrows in FIG.

The injection structure as described above can be employed in the display device of the present invention.

  Further, in the injection structure described with reference to FIG. 7, another configuration in which the interlayer film is increased can be taken.

  As an example, FIG. 51 illustrates a structure including a light-emitting element having a top emission structure. 51 differs from FIG. 7A in that a structure in which an interlayer insulating film 5101 is provided in one layer and a wiring 5102 for connecting to the first electrode is provided. By adopting a film having flatness as the interlayer insulating film 5101, it is possible to reduce disconnection of wiring caused by a step of the interlayer film in the first electrode or the like provided over the interlayer insulating film 5101, which is preferable. is there.

In addition, a structure in which a first reflective electrode 5103 made of the same material as the gate electrode and a second reflective electrode 5104 made of the same material as the source / drain electrode are provided below the light-emitting element may be employed. In the top emission structure, the light emitted to the lower part of the light emitting element is not emitted to the viewer side, and the light extraction efficiency is poor. However, it is preferable to employ a structure in which the first reflective electrode 5103 and the second reflective electrode 5104 are provided, so that light can be emitted more on the top surface of the light emitting element.

The injection structure as described above can be employed in the display device of the present invention.

(Configuration of Light Emitting Element Material in Display Device of Present Embodiment)
Next, a specific example of a light emitting element material applied to a light emitting element applicable to the display device of the present invention will be described.

  Regarding the configuration of the pixel portion of the present invention, the pixel of the present invention has a first pixel, a second pixel, a third pixel, a fourth pixel, a fifth pixel, and a sixth pixel. This has been described with reference to FIG. Each of the first to sixth pixels is provided with a light emitting element, the first pixel is a light emitting element R1, the second pixel is a light emitting element R2, the third pixel is a light emitting element G1, A light emitting element G2 is connected to the fourth pixel, a light emitting element B1 is connected to the fifth pixel, and a light emitting element B2 is connected to the sixth pixel.

  In the present specification, when the light emitting element R1 of the first pixel and the light emitting element R2 of the second pixel of the present invention are represented by a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.50 or more. Have coordinates in the area. In addition, the light emitting element G1 of the third pixel and the light emitting element G2 of the fourth pixel of the present invention are regions in which y in the chromaticity diagram is 0.55 or more when represented by the CIE-XY chromaticity diagram. Has coordinates. In the light emitting element B1 of the fifth pixel and the light emitting element B2 of the sixth pixel of the present invention, when the CIE-XY chromaticity diagram is expressed, x in the chromaticity diagram is 0.15 or less, and y is 0. It has coordinates in the area of .2 or less.

  Note that any one of the light-emitting element included in the first pixel and the light-emitting element included in the second pixel has a chromaticity diagram with x of 0.6 or more when expressed in a CIE-XY chromaticity diagram. , Y has coordinates in a region of 0.35 or less, and the light emitting element included in the third pixel or the light emitting element included in the fourth pixel is a CIE-XY chromaticity diagram. In the chromaticity diagram, x has a coordinate in a region where x is 0.3 or less and y is 0.6 or more, the light emitting element included in the fifth pixel, and the sixth pixel Any of the light-emitting elements included in the CIE-XY chromaticity diagram has coordinates in a region where x in the chromaticity diagram is 0.15 or less and y is 0.2 or less. It is more preferable to satisfy the configuration. A light emitting element provided in the first pixel, a light emitting element provided in the second pixel, a light emitting element provided in the third pixel, a light emitting element provided in the fourth pixel, and a fifth pixel The color in the CIE-XY chromaticity diagram can be obtained by arranging the light emitting elements provided in the CIE-XY chromaticity diagram in different regions when the provided light emitting device and the light emitting device provided in the sixth pixel are represented in the CIE-XY chromaticity diagram. A display device with a further improved reproduction range can be obtained.

  Specific examples of the light emitting element R1 and the light emitting element R2 used in the first pixel and the second pixel of the present invention will be described.

  A specific element structure of the light-emitting element R1 provided in the first pixel will be described. First, on ITO (110 nm), CuPc is 20 nm as a hole injection layer, NPB is 30 nm as a hole transport layer, and then a host material, 2,3-bis (4-diphenylaminophenyl) quinoxaline ( Abbreviation: TPAQn) and (acetylacetonato) bis [2- (2′-benzothienyl) pyridinato-N, C3 ′] iridium (abbreviation: Ir (btp) 2 (acac)) co-deposited layer of 30 nm, Next, BAlq was formed to 10 nm as an electron transport layer, Alq was further formed to 20 nm, calcium fluoride was formed to 2 nm as an electron injection layer, and finally Al was formed to a thickness of 150 nm as a cathode. Note that the ratio between TPAQn and Ir (btp) 2 (acac) in the light emitting layer was adjusted so that Ir (btp) 2 (acac) was 8 wt%.

  A specific element structure of the light-emitting element R2 provided in the second pixel will be described. First, on ITO (110 nm), CuPc is 20 nm as a hole injection layer, NPB is 30 nm as a hole transport layer, and then a layer in which TPAQn and rubrene as a host material are co-deposited as a light emitting layer is 30 nm, and then electron transport is performed. BAlq was formed to be 10 nm, Alq was further formed to 20 nm, calcium fluoride was formed to 2 nm as the electron injection layer, and finally Al was formed to be 150 nm as the cathode. In addition, the ratio of TPAQn and rubrene in the light emitting layer was adjusted so that rubrene might be 10 wt%.

  FIG. 8 shows an emission spectrum 801 for the manufactured light emitting element R1 and an emission spectrum 802 for the light emitting element R2. The emission spectrum of FIG. 8 is an emission spectrum when a current is passed through the light emitting element at a current density of 25 mA / cm 2. In FIG. 8, the emission spectrum 802 of R2 exists at a position shifted to the lower wavelength side of the emission spectrum 801 of R1. At this time, the chromaticity coordinates in the CIE-XY chromaticity diagram of the light emitting element R1 are (x, y) = (0.68, 0.32). Further, the chromaticity coordinates in the CIE-XY chromaticity diagram of the light emitting element R2 are (x, y) = (0.47, 0.52).

  Next, specific examples of the light-emitting element G1 and the light-emitting element G2 used for the third pixel and the fourth pixel of the present invention will be described.

  A specific element structure of the light-emitting element G1 provided in the third pixel will be described. On ITO (110 nm), DNTPD is 50 nm as a hole injection layer, NPB is 10 nm as a hole transport layer, and then a layer obtained by co-depositing Alq as a host material and coumarin 6 as a light emitting layer is 37.5 nm. Next, Alq was formed as an electron transport layer at 37.5 nm, then calcium fluoride was formed as an electron injection layer at 2 nm, and finally, Al was formed as a cathode at 150 nm. The ratio of Alq and coumarin 6 in the light emitting layer was adjusted so that coumarin 6 was 0.3 wt%.

  In addition, a specific element structure of the light-emitting element G2 provided in the fourth pixel will be described. On ITO (110 nm), DNTPD is 50 nm as a hole injection layer, NPB is 10 nm as a hole transport layer, then a layer in which Alq and DMQd as host materials are co-deposited as a light emitting layer is 37.5 nm, and then It was prepared by forming Alq as an electron transport layer at 37.5 nm, then forming an electron injection layer by calcium fluoride at 2 nm, and finally forming a cathode at 150 nm as Al. The ratio of Alq to DMQd in the light emitting layer was adjusted so that DMQd was 0.3 wt%.

  FIG. 9 shows an emission spectrum 901 for the manufactured light-emitting element G1 and an emission spectrum 902 for the light-emitting element G2. The emission spectrum in FIG. 9 is an emission spectrum when a current is passed through the light emitting element at a current density of 25 mA / cm 2. In FIG. 9, the emission spectrum 902 of G2 exists at a position shifted to the higher wavelength side of the emission spectrum 901 of G1. At this time, the chromaticity coordinates in the CIE-XY chromaticity diagram of the light emitting element G1 are (x, y) = (0.28, 0.63). Further, the chromaticity coordinates in the CIE-XY chromaticity diagram of the light emitting element G2 are (x, y) = (0.43, 0.56).

  Next, specific examples of the light-emitting element B1 and the light-emitting element B2 used for the fifth pixel and the sixth pixel of the present invention will be described.

  A specific element structure of the light-emitting element B1 provided in the fifth pixel is described. On ITO (110 nm), DNTPD is 30 nm as a hole injection layer, NPB is 30 nm as a hole transport layer, t-BuDNA is 40 nm as a light emitting layer, Alq is 20 nm as an electron transport layer, and then as an electron injection layer. The film was prepared by depositing calcium fluoride with a thickness of 2 nm and finally with a cathode having a thickness of 150 nm.

  In addition, a specific element structure of the light-emitting element B2 provided in the sixth pixel is described. On ITO (110 nm), 30 nm of DNTPD as a hole injection layer, 30 nm of NPB as a hole transport layer, 40 nm of a layer in which t-BuDNA and TPAQn are co-deposited as a light emitting layer, and then Alq as an electron transport layer And 20 nm of calcium fluoride as an electron injection layer, and finally 150 nm of Al as a cathode. The ratio of t-BuDNA to TPAQn in the light emitting layer was adjusted so that TPAQn was 5 wt%.

  FIG. 10 shows an emission spectrum 1001 for the manufactured light-emitting element B1 and an emission spectrum 1002 for the light-emitting element B2. The emission spectrum of FIG. 10 is an emission spectrum when a current is passed through the light emitting element at a current density of 25 mA / cm 2. In FIG. 10, the emission spectrum 1002 of B2 exists at a position shifted to the higher wavelength side of the emission spectrum 1001 of B1. At this time, the chromaticity coordinates in the CIE-XY chromaticity diagram of the light emitting element B1 are (x, y) = (0.15, 0.11). Further, the chromaticity coordinates in the CIE-XY chromaticity diagram of the light emitting element B2 are (x, y) = (0.18, 0.32).

  FIG. 11 shows a CIE-XY chromaticity diagram, in which the chromaticity coordinates of the light-emitting element R1, the light-emitting element R2, the light-emitting element G1, the light-emitting element G2, the light-emitting element B1, and the light-emitting element B2 produced above are plotted. In FIG. 11, a region where dots are connected with respect to the chromaticity coordinates of the light emitting elements R1, G1, and B1 is RGB1, and a region where dots are connected with respect to the chromaticity coordinates of the light emitting elements R2, G2, and B2. Is RGB2. By providing light emitting elements having different shades for RGB, which are the three primary colors, it is possible to express the shade of each color in the region surrounded by RGB6 shown in FIG. 11, and color reproduction on the CIE-XY chromaticity diagram A display device with an improved range can be provided.

In each light emitting element, in order to increase color purity, L = (2m−1) where L is the optical distance between the light emitting region of the light emitting element and the reflective electrode (electrode that reflects light), and λ is the target wavelength. ) A so-called microresonator structure (microcavity structure) that satisfies λ / 4 (where m is a natural number of 1 or more) may be employed. The optical distance is calculated by “actual distance × refractive index at wavelength λ”.

  Note that any one of the chromaticity coordinates of the light emitting elements R2, G2, and B2 may be present in a place other than the region formed by connecting the chromaticity coordinates of the light emitting elements R1, G1, and B1. This is because the color reproduction ranges of RGB1 and RGB2 in FIG. 11 overlap when all of the light emitting elements R2, G2, and B2 are present in an area formed by connecting the chromaticity coordinates of the light emitting elements R1, G1, and B1. It is.

  As described above, the display device of the present invention can employ the above light-emitting element material in each pixel. Note that the materials of the light-emitting elements listed above are only a part, and any light-emitting elements that can have the same chromaticity coordinates as in the present invention may be used.

Note that this embodiment mode can be implemented freely combining with any description in the embodiments or embodiment modes in this specification.

(Embodiment 2)
In this embodiment mode, a structure different from the structure of the light-emitting element in the display device of the present invention described in the above embodiment mode is described.

  Regarding the configuration of the pixel portion of the present invention, the pixel of the present invention has a first pixel, a second pixel, a third pixel, a fourth pixel, a fifth pixel, and a sixth pixel. This has been described with reference to FIG. Each of the first to sixth pixels is provided with a light emitting element, the first pixel is a light emitting element R1, the second pixel is a light emitting element R2, the third pixel is a light emitting element G1, A light emitting element G2 is connected to the fourth pixel, a light emitting element B1 is connected to the fifth pixel, and a light emitting element B2 is connected to the sixth pixel.

  In the present specification, when the light emitting element R1 of the first pixel and the light emitting element R2 of the second pixel of the present invention are represented by a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.50 or more. It is assumed that the area has coordinates. In addition, the light emitting element G1 of the third pixel and the light emitting element G2 of the fourth pixel of the present invention are regions in which y in the chromaticity diagram is 0.55 or more when represented by the CIE-XY chromaticity diagram. Have coordinates. In the light emitting element B1 of the fifth pixel and the light emitting element B2 of the sixth pixel of the present invention, when the CIE-XY chromaticity diagram is expressed, x in the chromaticity diagram is 0.15 or less, and y is 0. It has coordinates in the area of .2 or less.

  In the present embodiment, the first pixel, the light emitting elements R1, R2, provided in the second pixel, the third pixel, the light emitting elements G1, G2, provided in the fourth pixel, the fifth pixel, In the light emitting elements B1 and B2 provided in the sixth pixel, the emission spectra are made different by changing the film thickness of each light emitting element. As a result, when expressed in the CIE-XY chromaticity diagram, the coordinates of the chromaticity diagram are represented by the light emitting elements R1, R2, the third pixel, and the fourth pixel provided in the first pixel and the second pixel, respectively. The light emitting elements G1 and G2, the fifth pixel, and the light emitting elements B1 and B2 provided in the sixth pixel are different. Specific examples will be described below.

  In the present embodiment, the light emitting element G1 and the light emitting element G2 used for the third pixel and the fourth pixel are specifically used to make the coordinates of the chromaticity diagram different when expressed in the CIE-XY chromaticity diagram. An example will be described.

  A specific structure of the light-emitting element G1 provided in the third pixel is described. First, a layer in which CuPc is 20 nm as a hole injection layer, NPB is 40 nm as a hole transport layer, and Alq as a host material and coumarin 6 as a green light emitting material are co-deposited as a light emitting layer on ITO (110 nm). 40 nm, and then a layer in which Alq and Li were co-deposited as an electron injection layer was formed to 30 nm, and finally, Al was formed to 150 nm as a cathode. The ratio of Alq and coumarin 6 in the light emitting layer was adjusted so that coumarin 6 was 0.3 wt%. The ratio of Alq to Li in the electron injection layer was adjusted so that Li was 1 wt%.

  FIG. 12A illustrates a stacked structure of the light-emitting element G1 provided in the third pixel. An anode 1213 is formed on a substrate 1211 through a transistor 1212, a hole injection layer 1201A made of a hole injection material, a hole transport layer 1202A made of a hole transport material, an emission layer 1203A, and an electron made of an electron transport material. In this element structure, a transport layer 1204A, an electron injection layer 1205A made of an electron injection material, and a cathode 1214 are stacked. 12A is an enlarged cross-sectional view of the light emitting element portion in FIG.

  A specific element structure of the light-emitting element G2 provided in the fourth pixel will be described. First, a layer in which CuPc is 20 nm as a hole injection layer, NPB is 40 nm as a hole transport layer, and Alq as a host material and coumarin 6 as a green light emitting material are co-deposited as a light emitting layer on ITO (110 nm). 40 nm, and then a layer obtained by co-depositing Alq and Li as an electron injection layer was formed by depositing 30 nm, then a co-deposited layer of NPB and molybdenum oxide (VI) was formed by 180 nm, and finally Al was formed by depositing 150 nm as a cathode. . The ratio of Alq and coumarin 6 in the light emitting layer was adjusted so that coumarin 6 was 0.3 wt%. The ratio of Alq to Li in the electron injection layer was adjusted so that Li was 1 wt%. The ratio of NPB to molybdenum oxide (VI) was adjusted so that molybdenum oxide was 20 wt%.

  FIG. 12B illustrates a stacked structure of the light-emitting element G2 provided in the fourth pixel. An anode 1213 through a transistor 1212 on a substrate 1211, a hole injection layer 1201B made of a hole injection material, a hole transport layer 1202B made of a hole transport material, an emission layer 1203B, and an electron made of an electron transport material. It is an element structure in which a transport layer 1204B, an electron injection layer 1205B made of an electron injection material, a co-deposited layer 1206 of NPB and molybdenum oxide (VI), and a cathode 1214 are stacked. Note that the laminated structure in the right view of FIG. 12B is an enlarged cross-sectional view of the light emitting element portion in FIG.

  Further, FIG. 13 shows an emission spectrum 1301 for the light emitting element G1 stacked as shown in FIG. 12A and an emission spectrum 1302 for the light emitting element G2 stacked as shown in FIG. 12B. The emission spectrum of FIG. 13 is an emission spectrum when a current is passed through the light emitting element at a current density of 25 mA / cm 2. In FIG. 13, the emission spectrum 1302 of G2 exists at a position shifted to the lower wavelength side of the emission spectrum 1301 of G1. At this time, the chromaticity coordinates in the CIE-XY chromaticity diagram of the light emitting element G1 are (x, y) = (0.30, 0.64). Further, the chromaticity coordinates in the CIE-XY chromaticity diagram of the light emitting element G2 are (x, y) = (0.21, 0.69).

  Similarly, the light emitting element R1 provided in the first pixel, the light emitting element R2 provided in the second pixel, the light emitting element B1 provided in the fifth pixel, and the light emitting element provided in the sixth pixel. By providing light emitting elements having different film thicknesses in B2, light emitting elements having different emission spectra can be obtained. In other words, the light emitting element R1 provided in the first pixel, the light emitting element R2 provided in the second pixel, the light emitting element B1 provided in the fifth pixel, and the light emitting element B2 provided in the sixth pixel. , Light emitting elements having chromaticity coordinates on different CIE-XY chromaticity diagrams can be obtained.

As exemplified in the present embodiment, the CIE-XY colors differ depending on the thickness of the light emitting elements R1 and R2, the light emitting elements G1 and G2, and the light emitting elements B1 and B2. A light emitting element having chromaticity coordinates on the degree diagram can be obtained. Needless to say, light emitting elements having different chromaticity coordinates on the CIE-XY chromaticity diagram may be obtained by using different light emitting element materials and changing the film thickness of the light emitting elements.

Further, changing the emission spectrum by changing the film thickness of the light emitting element (thickening) is not particularly limited to achieving by forming a co-evaporated layer, for example, as shown in FIGS. As described above, the hole injection layer 1201, the hole transport layer 1202, the light-emitting layer 1203, the electron transport layer 1204, or the electron injection layer 1205 may be thickened. For example, as shown in FIG. 45 (a), the hole injection layer 1201 is thickened so that the light emitting elements R1 and R2, the light emitting elements G1 and G2, and the light emitting elements B1 and B2 have different film thicknesses. Good. In addition, as shown in FIG. 45B, the hole transport layer 1202 is thickened so that the light emitting elements R1 and R2, the light emitting elements G1 and G2, and the light emitting elements B1 and B2 have different thicknesses. Also good. Further, as shown in FIG. 45C, the light emitting layer 1203 may be thickened so that the light emitting elements R1 and R2, the light emitting elements G1 and G2, and the light emitting elements B1 and B2 have different thicknesses. . Further, as shown in FIG. 54A, the electron transport layer 1204 is thickened so that the light emitting element R1 and the light emitting element R2, the light emitting element G1 and the light emitting element G2, and the light emitting elements B1 and B2 have different film thicknesses. Good. Further, as shown in FIG. 54B, the electron injection layer may be thickened so that the light emitting element R1 and the light emitting element R2, the light emitting element G1 and the light emitting element G2, and the light emitting elements B1 and B2 have different film thicknesses. . Of course, any one of the hole injection layer, the hole transport layer, the light emitting layer, the electron transport layer, or the electron injection layer is thickened to make the emission spectrum different, and the chromaticity coordinates on different CIE-XY chromaticity diagrams. You may obtain the light emitting element which has this.

In this embodiment mode, a co-evaporated layer containing a metal oxide is used to achieve a thick film. By using a metal oxide for the co-deposition layer, it is possible to prevent an increase in driving voltage due to the increase in film thickness, which is preferable.

Note that in the present embodiment of the present invention, the optical distance L between the light emitting region of the light emitting element and the reflective electrode (electrode that reflects light) and the target wavelength is λ, L = (2m−1) λ / This is different from a so-called microresonator structure (microcavity structure) that satisfies 4 (where m is a natural number of 1 or more). The optical distance is calculated by “actual distance × refractive index at wavelength λ”. In this embodiment of the present invention, the optical distance between the light emitting elements R1 and R2, the light emitting elements G1 and G2, and the light emitting elements B1 and B2 is different from each other as long as the emission spectra are different. You may design it. For example, the thickness of the light emitting element may be designed to be thinner in the order of the light emitting element R1, the light emitting element R2, the light emitting element G1, the light emitting element G2, the light emitting element B1, and the light emitting element B2, or the light emitting element R1 and the light emitting element R2, The light emitting element G1 and the light emitting element G2, and the light emitting element B1 and the light emitting element B2 may be set thinly in this order.

  Note that in this embodiment, by increasing the thickness of the light-emitting element, the distance D between the first electrode (anode) of the light-emitting element and the second electrode (cathode) of the light-emitting element is equal to that of the light-emitting element R1. The light emitting element R2, the light emitting element G1 and the light emitting element G2, and the light emitting elements B1 and B2 are different. In this specification, the distance D between the first electrode (anode) of the light-emitting element and the second electrode (cathode) of the light-emitting element is the end face on the light-emitting layer side of each electrode (in this embodiment, the first surface The distance between the first electrode side and the hole injection layer on the second electrode side and the boundary with the electron injection layer on the second electrode side.

  As described above, the display device of the present invention can employ the above light-emitting element material in each pixel. Note that the materials of the light-emitting elements listed above are only a part, and any light-emitting elements that can have the same chromaticity coordinates as in the present invention may be used.

Note that this embodiment mode can be implemented freely combining with any description in the embodiments or embodiment modes in this specification.

(Embodiment 3)
In this embodiment mode, a structure different from the structure of the light-emitting element in the display device of the present invention described in the above embodiment mode is described.

  Regarding the configuration of the pixel portion of the present invention, the pixel of the present invention has a first pixel, a second pixel, a third pixel, a fourth pixel, a fifth pixel, and a sixth pixel. This has been described with reference to FIG. Each of the first to sixth pixels is provided with a light emitting element, the first pixel is a light emitting element R1, the second pixel is a light emitting element R2, the third pixel is a light emitting element G1, A light emitting element G2 is connected to the fourth pixel, a light emitting element B1 is connected to the fifth pixel, and a light emitting element B2 is connected to the sixth pixel.

  In the present specification, when the light emitting element R1 of the first pixel and the light emitting element R2 of the second pixel of the present invention are represented by a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.50 or more. Have coordinates in the area. In addition, the light emitting element G1 of the third pixel and the light emitting element G2 of the fourth pixel of the present invention are regions in which y in the chromaticity diagram is 0.55 or more when represented by the CIE-XY chromaticity diagram. Has coordinates. In the light emitting element B1 of the fifth pixel and the light emitting element B2 of the sixth pixel of the present invention, when the CIE-XY chromaticity diagram is expressed, x in the chromaticity diagram is 0.15 or less, and y is 0. It has coordinates in the area of .2 or less.

  In the present embodiment, the first pixel, the light emitting elements R1, R2, provided in the second pixel, the third pixel, the light emitting elements G1, G2, provided in the fourth pixel, the fifth pixel, In the light emitting elements B1 and B2 provided in the sixth pixel, the emission spectra are approximately equal between R1 and R2, G1 and G2, and B1 and B2, and a color filter is provided in a light transmission part from each light emitting element. The emission spectrum is varied depending on the configuration. As a result, when expressed in the CIE-XY chromaticity diagram, the coordinates of the chromaticity diagram are represented by the light emitting elements R1, R2, the third pixel, and the fourth pixel provided in the first pixel and the second pixel, respectively. The light emitting elements G1 and G2, the fifth pixel, and the light emitting elements B1 and B2 provided in the sixth pixel are different. Specific examples will be described below.

  In this embodiment mode, a structure of a display device will be described using a cross-sectional structure of a picture element portion.

  FIG. 14 is a part of a cross-sectional view of a picture element of the display device in this embodiment. A display device of the present invention shown in FIG. 14A includes a substrate 1400, a base insulating film 1401, a semiconductor layer 1402, a gate insulating film 1403, a gate electrode 1404, an interlayer insulating film 1405, a connection portion 1406, and a first light emitting element. Electrode 1407, partition 1408, light emitting layer 1409, second electrode 1410 of the light emitting element, color filter (R1) 1411, color filter (R2) 1412, color filter (G1) 1413, color filter (G2) 1414, color filter ( B1) 1415, a color filter (B2) 1416, and a counter substrate 1417 are included.

  The light-emitting element is formed in a portion where the light-emitting layer 1409 is sandwiched between the first electrode 1407 and the second electrode 1410 of the light-emitting element. The light-emitting element is connected to a thin film transistor including a semiconductor layer 1402, a gate insulating film 1403, and a gate electrode 1404 through a connection portion 1406 that is in electrical contact with the first electrode 1407, and light emission is controlled. In this embodiment, the first electrode 1407 is a reflective electrode formed of a highly reflective material, the second electrode 1410 is a transparent electrode formed of a light-transmitting conductive material, The light is emitted from the direction of the electrode 1410.

  Note that the thin film transistor in FIG. 14A drives the light emitting element R1, the light emitting element G1, the light emitting element B1, the light emitting element R2, the light emitting element G2, and the light emitting element B2 in this order from the left. Note that the emission spectra of the light-emitting elements in the case where no color filter is provided in each pixel are approximately equal for R1 and R2, G1 and G2, and B1 and B2. 14A schematically illustrates light emission from the light-emitting element R1, the light-emitting element G1, the light-emitting element B1, the light-emitting element R2, the light-emitting element G2, and the light-emitting element B2 in order from the left. It is a representation.

  In the present embodiment, the light emitting elements R1, R2, provided in the first pixel, the second pixel, the third pixel, the light emitting elements G1, G2, provided in the fourth pixel, the fifth pixel, For each of the light emitting elements B1 and B2 provided in the six pixels, a color filter (R1) 1411, a color filter (R2) 1412, a color filter (G1) 1413, and a color filter (G2) are provided on the light emission side. 1414, a color filter (B1) 1415, and a color filter (B2) 1416 are provided. In this embodiment mode, the color filter (R1) 1411 and the color filter (R2) 1412, the color filter (G1) 1413 and the color filter (G2) 1414, the color filter (B1) 1415, and the color filter (B2) 1416 By changing the light transmission characteristics, the light emitting elements R1 and R2, the light emitting elements G1 and G2, and the light emitting elements B1 and B2 have different emission spectra. A light emitting element having chromaticity coordinates on the -XY chromaticity diagram can be obtained.

  The color filter may be produced by any of the pigment dispersion method, printing method, electrodeposition method, and dyeing method. In addition, the light emitting elements R1 and R2 provided in the first pixel and the second pixel, the third pixel, the light emitting elements G1 and G2 provided in the fourth pixel, the fifth pixel, and the sixth pixel Each of the provided light emitting elements B1 and B2 may be a light emitting element having the same emission spectrum, for example, a light emitting element having an emission spectrum that emits white light. By including the same light emitting element, the process of manufacturing the light emitting element can be simplified, which is preferable.

  FIG. 14B is a part of a cross-sectional view of a pixel of the display device in this embodiment mode. Note that each structure of the display device of the present invention illustrated in FIG. 14B is based on FIG.

  A difference from FIG. 14A is that light emitted from the light emitting element R1, the light emitting element G1, and the light emitting element B1 does not pass through a color filter. At this time, it is assumed that the emission spectra of the light emitting elements when no color filter is provided in each pixel are approximately equal between R1 and R2, G1 and G2, and B1 and B2. In FIG. 14B, emission spectra of light emitted from the light emitting element R2, the light emitting element G2, and the light emitting element B2 are transmitted through the color filter (R2) 1412, the color filter (G2) 1414, and the color filter (B2) 1416. Different depending on the characteristics. As a result, the light emission spectrums of the light emitted by the light emitting elements R1 and R2, the light emitting elements G1 and G2, and the light emitting elements B1 and B2 are made different from each other, so that different CIE-XY chromaticity diagrams are obtained. A light emitting element having chromaticity coordinates can be obtained.

  The light emitting elements of the same color are arranged on the entire surface, and the light emitting elements R1 and R2, the light emitting elements G1 and G2, and the light emitting elements B1 and B2 are emitted through color filters having different transmission characteristics. It is also possible to obtain light emitting elements having chromaticity coordinates on different CIE-XY chromaticity diagrams by differentiating the emission spectra of the emitted light. For example, a white light-emitting element may be provided as the same color light-emitting element, and a color filter may be provided above the first to sixth pixels as illustrated in FIG.

  FIG. 15A illustrates a display device of the present invention having a structure different from that in FIG. Note that each structure of the display device of the present invention illustrated in FIG. 15A is similar to FIG. FIG. 15A illustrates an example of a bottom emission display device in which a light-emitting element emits light to the first electrode 1407 side of the light-emitting element. In FIG. 15B, since light emission is extracted from the first electrode 1407 side, the first electrode 1407 is formed using a light-transmitting conductive material, and the second electrode 1410 serves as a reflective electrode. It is produced using.

  In the present embodiment, the light emitting elements R1, R2, provided in the first pixel, the second pixel, the third pixel, the light emitting elements G1, G2, provided in the fourth pixel, the fifth pixel, For each of the light emitting elements B1 and B2 provided in the six pixels, a color filter (R1) 1411, a color filter (R2) 1412, a color filter (G1) 1413, and a color filter (G2) are provided on the light emission side. 1414, a color filter (B1) 1415, and a color filter (B2) 1416 are provided. In this embodiment mode, the color filter (R1) 1411 and the color filter (R2) 1412, the color filter (G1) 1413 and the color filter (G2) 1414, the color filter (B1) 1415, and the color filter (B2) 1416 By changing the light transmission characteristics, the light emitting elements R1 and R2, the light emitting elements G1 and G2, and the light emitting elements B1 and B2 have different emission spectra. A light emitting element having chromaticity coordinates on the -XY chromaticity diagram can be obtained.

  The color filter may be produced by any of the pigment dispersion method, printing method, electrodeposition method, and dyeing method. In addition, the light emitting elements R1 and R2 provided in the first pixel and the second pixel, the third pixel, the light emitting elements G1 and G2 provided in the fourth pixel, the fifth pixel, and the sixth pixel Each of the provided light emitting elements B1 and B2 may be a light emitting element having the same emission spectrum, for example, a light emitting element having an emission spectrum that emits white light. By including the same light emitting element, the process of manufacturing the light emitting element can be simplified, which is preferable.

  FIG. 15B is a part of a cross-sectional view of a picture element of the display device in this embodiment mode. Note that each structure of the display device of the present invention illustrated in FIG. 15B is similar to FIG.

  A difference from FIG. 15A is that light emitted from the light emitting element R1, the light emitting element G1, and the light emitting element B1 does not pass through a color filter. At this time, it is assumed that the emission spectra of the light emitting elements in the case where no color filter is provided in each pixel are approximately equal for R1 and R2, G1 and G2, and B1 and B2. In FIG. 15B, emission spectra of light emitted from the light emitting element R2, the light emitting element G2, and the light emitting element B2 are transmitted through the color filter (R2) 1412, the color filter (G2) 1414, and the color filter (B2) 1416. Different depending on the characteristics. As a result, the light emission spectrums of the light emitted by the light emitting elements R1 and R2, the light emitting elements G1 and G2, and the light emitting elements B1 and B2 are made different from each other, so that different CIE-XY chromaticity diagrams are obtained. A light emitting element having chromaticity coordinates can be obtained.

  Note that light emitting elements of the same color are arranged on the entire surface, color filters having different transmission characteristics are provided on the light emitting elements in a superimposed manner, and the light emitting elements R1, R2, and G1 emitted through the color filters are emitted. It is also possible to obtain light emitting elements having different chromaticity coordinates on the CIE-XY chromaticity diagram by differentiating the emission spectra of the light emitting element G2 and the light emitting elements B1 and B2. For example, a white light-emitting element may be provided as the light-emitting element of the same color, and a color filter may be provided above the first to sixth pixels as illustrated in FIG.

  FIG. 15C is a part of a cross-sectional view of a pixel of the display device in this embodiment mode. Note that each structure of the display device of the present invention illustrated in FIG. 15C is based on FIG.

  15A and 15B are different in color filter (R1) 1411, color filter (R2) 1412, color filter (G1) 1413, color filter (G2) 1414, color filter (B1) 1415, color The filter (B2) 1416 is located at a position below the first electrode 1407 disposed between the light-emitting element and the transistor. The process is simple and easy. As a result, the light emission spectrums of the light emitted by the light emitting elements R1 and R2, the light emitting elements G1 and G2, and the light emitting elements B1 and B2 are made different from each other, so that different CIE-XY chromaticity diagrams are obtained. A light emitting element having chromaticity coordinates can be obtained.

  Further, by using a method of arranging a single color light emitting element having a short wavelength and converting to a necessary color through the color conversion layer, the light emitting element R1 and the light emitting element R2, the light emitting element G1 and the light emitting element G2, and the light emitting element B1 and the light emitting element are emitted. It may be possible to obtain light emitting elements having different chromaticity coordinates on the CIE-XY chromaticity diagram by differentiating the emission spectrum of light emitted from the element B2. A display device of the present invention illustrated in FIG. 40A includes a substrate 4000, a base insulating film 4001, a semiconductor layer 4002, a gate insulating film 4003, a gate electrode 4004, an interlayer insulating film 4005, a connection portion 4006, and a first light emitting element. Electrode 4007, partition wall 4008, light emitting layer 4009A and light emitting layer 4009B, second electrode 4010 of the light emitting element, color conversion layer (R1) 4011, color conversion layer (G1) 4012, color conversion layer (R2) 4013, color conversion layer (G2) Includes configurations of 4014 and counter substrate 4015.

For example, as the light emitting layer 4009A and the light emitting layer 4009B having a short wavelength, blue light emitting elements B1 and B2 having different emission spectra are arranged, and in the case of top emission (top emission) as shown in FIG. A color conversion layer may be provided above the first pixel, the second pixel, the fourth pixel, and the fifth pixel. In the case of adopting bottom emission, blue light emitting elements B1 and B2 having different emission spectra are arranged as the monochromatic light emitting layers 4009A and 4009B having a short wavelength, as shown in FIG. A color conversion layer may be disposed below the pixel, the second pixel, the fourth pixel, and the fifth pixel.

  Note that when the blue light-emitting elements B1 and B2 having different emission spectra are disposed as the monochromatic light-emitting elements having a short wavelength, the blue light-emitting elements B1 and B2 such as the light-emitting layers 4109A and 4109B in FIG. The film thickness of the light emitting element may be varied to vary the emission spectrum. For example, in the case of top emission (top emission) as shown in FIG. 41A, a blue light emitting layer 4109A and a light emitting layer 4109B having different emission spectra are provided as monochromatic light emitting elements having a short wavelength, and the first pixel is arranged. A color conversion layer may be provided above the second pixel, the fourth pixel, and the fifth pixel. In the case of adopting bottom emission, the light emitting layer 4109A and the light emitting layer 4109B of the blue light emitting element are arranged as shown in FIG. 41B, and the first pixel, the second pixel, and the fourth pixel are arranged. A color conversion layer may be disposed below the fifth pixel. Each configuration of the display device of the present invention shown in FIG. 41 is based on FIG.

  With regard to the color conversion method for converting to a necessary color through the color conversion layer, it can be said that it is a great advantage that there is no need to separately coat the light emitting layer because the light emitting color emitted from the light emitting element is one color. In addition, compared with the color filter method, the color conversion method is preferable because the color conversion layer obtains desired light emission using the progress of light absorption, excitation, and light emission.

Note that this embodiment mode can be implemented freely combining with any description in the embodiments or embodiment modes in this specification.

(Embodiment 4)
In the present embodiment, a configuration in which the pixel arrangement in one picture element described in the above embodiment is different from that shown in FIG. 2 will be described.

  Note that the pixel of the present invention has a first pixel, a second pixel, a third pixel, a fourth pixel, a fifth pixel, and a sixth pixel with respect to the configuration of the pixel portion of the present invention. Was described in FIG. Each of the first to sixth pixels is provided with a light emitting element, the first pixel is a light emitting element R1, the second pixel is a light emitting element R2, the third pixel is a light emitting element G1, A light emitting element G2 is connected to the fourth pixel, a light emitting element B1 is connected to the fifth pixel, and a light emitting element B2 is connected to the sixth pixel.

  As shown in FIG. 16, the pixel arrangement of the display device in this embodiment is such that a first pixel 1601, a second pixel 1602, a third pixel 1603, and a fourth pixel 1604 are included in a picture element 1600. , Fifth pixel 1605 and sixth pixel 1606, and each pixel is arranged in a stripe pattern.

  In FIG. 16, each of the first pixel 1601 to the sixth pixel 1606 is arranged in the column direction, but there is no particular limitation on the arrangement method, and for example, the first pixel 1601 to the sixth pixel 1606 may be arranged in the row direction. Further, for example, the first pixel 1601 including the light emitting element R1 and the fifth pixel 1605 including the light emitting element G2 may be disposed adjacent to each other. Also, the shape of each pixel is not limited to a rectangle as shown in FIG. 16, but may be a square, other polygons, or a shape having a curvature.

  Note that the width between the first pixel 1601 to the sixth pixel 1606 may be arranged at the same interval or at different intervals.

  In FIG. 53A, in a pixel 1600, a first pixel 1601, a second pixel 1602, and a third pixel 1603 are arranged side by side, and a fourth pixel 1604, a fifth pixel 1605, and a sixth pixel are arranged. Pixels 1606 are arranged in the next row, and the first pixel 1601, the second pixel 1602, the third pixel 1603, the fourth pixel 1604, the fifth pixel 1605, and the sixth pixel 1606 are provided for one pixel. It may be shifted and arranged. In the present embodiment, the pixels are arranged so as to be shifted by one pixel in the row direction, but are not particularly limited to one pixel. For example, as shown in FIG. 53B, the pixels may be shifted by half a pixel. By adopting a configuration in which the pixels are arranged so as to be shifted for each row in this way, it is possible to perform smooth display particularly in the display of a natural moving image.

  Note that, in the light-emitting element R1, the light-emitting element R2, the light-emitting element G1, the light-emitting element G2, the light-emitting element B1, and the light-emitting element B2, the light-emitting efficiencies of the light-emitting elements exhibiting the respective emission colors are different. For this reason, the current required for obtaining light emission with a desired luminance is relatively higher in a light emitting element having a lower light emission efficiency. Furthermore, the human eye has different sensitivities for each emission wavelength, and generally has a higher sensitivity to the green emission wavelength than the red and blue emission wavelengths. Therefore, in order to emit blue and red light so that the human eye has the same sensitivity as green, it is necessary to make the luminance of blue and red relatively higher than the luminance of green. However, flowing a large amount of current through the light emitting element in order to increase the luminance of the light emitting element promotes deterioration of the light emitting element and increases power consumption of the display device. In addition, when the emission wavelength is shifted due to the deterioration of the light emitting element, the color reproducibility of the display device is lowered and the image quality may be lowered.

Therefore, the light emitting element R1, the light emitting element R2, the light emitting element G1, the light emitting element G2, the light emitting element B1, and the light emitting element B2 may have different structures in advance. For example, the area of the light emitting element R1, the light emitting element R2, the light emitting element B1, and the light emitting element B2 may be doubled, and the area of the light emitting element G1 and the light emitting element G2 may be left as they are. By adopting such a configuration, it is possible to average variations in deterioration among the light emitting elements, which is preferable.

In addition to the configuration shown in FIG. 16, the pixel arrangement of the display device shown in FIG. 17 includes a first pixel 1701, a second pixel 1702, a third pixel 1703, a fourth pixel in the picture element 1700. The pixel 1704, the fifth pixel 1705, and the sixth pixel 1706 each include a first pixel, a second pixel, and a third pixel, and a fourth pixel, a fifth pixel, and a sixth pixel. Delta arrangement is arranged.

In FIG. 17, the first pixel 1701 and the fourth pixel 1704, the second pixel 1702 and the fifth pixel 1705, and the third pixel 1703 and the sixth pixel 1706 are configured to have different areas. It is not limited to. The first pixel 1701 and the fourth pixel 1704, the second pixel 1702 and the fifth pixel 1705, the third pixel 1703 and the sixth pixel 1706 may have the same area, or the first pixels 1701 to 1701. The sixth pixel 1706 may have different areas. Further, the method of taking the picture element is not particularly limited, and the picture element 1710 may form an image.

  Further, for example, the first pixel 1701 including the light emitting element R1 and the third pixel 1703 including the light emitting element B1 may be disposed adjacent to each other. Also, the shape of each pixel is not limited to the rectangle as shown in FIG. 17, and may be a square, other polygons, or a shape having a curvature, for example. Note that the width between the first pixel 1701 to the sixth pixel 1706 may be arranged at the same interval or at different intervals.

  In the display device of the present invention, not only the first to sixth pixels but also the first pixel 1801, the second pixel 1802, the third pixel 1803, and the fourth pixel as shown in FIG. 1804, a fifth pixel 1805, a sixth pixel 1806, a seventh pixel 1807, an eighth pixel 1808, and a ninth pixel 1809 may be employed. Note that the seventh pixel 1807 includes the light-emitting element R3, the eighth pixel 1808 includes the light-emitting element G3, and the ninth pixel 1809 includes the light-emitting element B3.

In FIG. 18, the first pixel 1801, the fourth pixel 1804, and the seventh pixel 1807, the second pixel 1802, the fifth pixel 1805, and the eighth pixel 1808, and the third pixel 1803 and the sixth pixel 1806 are displayed. And the ninth pixel 1809 have different areas, but the present invention is not limited to this. The first pixel 1801, the fourth pixel 1804, the seventh pixel 1807, the second pixel 1802, the fifth pixel 1805, the eighth pixel 1808, the third pixel 1803, the sixth pixel 1806, and the ninth pixel. The pixels 1809 may have the same area, or the first pixel 1801 to the ninth pixel 1809 may have different areas.

  In the display device of the present invention, the first pixel 1901, the second pixel 1902, and the third pixel 1903 are arranged side by side as shown in FIG. 19A, without being limited to the first to sixth pixels. The fourth pixel 1904, the fifth pixel 1905, the sixth pixel 1906, and the seventh pixel 1907 may be arranged. Note that the seventh pixel includes a white light-emitting element W.

  Note that when the light emitting element W of the seventh pixel represents a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.30 or more and 0.40 or less, y is 0.30 or more, and 0. It shall have coordinates in the area below 40. More preferably, when the light emitting element W of the seventh pixel is represented by a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.30 or more and 0.35 or less, and y is 0.30. It is assumed that the coordinates are in the region of 0.35 or less.

19A, the first pixel 1901 and the fourth pixel 1904, the second pixel 1902 and the fifth pixel 1905, and the third pixel 1903 and the sixth pixel 1906 have the same area. However, it is not limited to this. The first pixel 1901 and the fourth pixel 1904, the second pixel 1902 and the fifth pixel 1905, the third pixel 1903 and the sixth pixel 1906 may have different areas, or the first pixel 1901 The sixth pixel 1906 may have different areas.

  FIG. 19B shows a structure different from that in FIG. 19A differs from FIG. 19A in that the first pixel 1901, the second pixel 1902, the third pixel 1903, the fourth pixel 1904, the fifth pixel 1905, the sixth pixel 1906, and the seventh pixel. 1907 is the difference in arrangement. Of course, the arrangement of each pixel is not particularly limited to this. Also, the shape of each pixel is not limited to a rectangle as shown in FIG. 19, but may be a square, other polygons, or a shape having a curvature.

In addition, by providing the seventh pixel with the light emitting element W that emits white light, white is displayed by the color mixture of the light emitting element R1, the light emitting element R2, the light emitting element G1, the light emitting element G2, the light emitting element B1, and the light emitting element B2. On the other hand, since display can be performed by light emission of only the light emitting element W, power consumption can be reduced, which is preferable. Further, when displaying an intermediate color, additive color mixing with white is preferable because power consumption can be further reduced.

  In the display device of the present invention, the picture element may include a light emitting element W1 that emits white light in the seventh pixel and a light emitting element W2 that emits white light in the eighth pixel. Good. Similarly to the light emitting element R1 and the light emitting element R2, the light emitting element G1 and the light emitting element G2, and the light emitting element B1 and the light emitting element B2, the light emitting element W1 and the light emitting element W2 have different emission spectra. As a result, it is possible to provide a display device that displays more vivid colors and consumes less power.

  Note that when the light emitting element W1 of the seventh pixel and the light emitting element W2 of the eighth pixel represent the CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.30 or more and 0.40 or less, It is assumed that the coordinates are in a region where y is 0.30 or more and 0.40 or less. More preferably, when the light emitting element W1 of the seventh pixel and the light emitting element W2 of the eighth pixel are represented by a CIE-XY chromaticity diagram, x in the chromaticity diagram is 0.30 or more and 0 It is assumed that the coordinates are in a region where .35 or less and y is 0.30 or more and 0.35 or less.

Note that this embodiment mode can be implemented freely combining with any description in the embodiments or embodiment modes in this specification.

(Embodiment 5)
In this embodiment mode, the pixel configuration and operation method described in the above embodiment modes are different from those shown in FIGS.

  According to the pixel configuration and operation method shown in FIGS. 4 and 5, the address (writing) period and the sustain (light emission) period are completely separated, so that the length of the sustain (light emission) period can be freely set. Although there is a merit, in the address (writing) period, while writing is performed in one row, writing and light emission are not performed in other rows. That is, the duty ratio is lowered as a whole.

  Therefore, an operation in which the address (writing) period and the sustain (light emission) period are not separated will be described.

  A pixel configuration for achieving the above operation is shown in FIG. The pixel configuration illustrated in FIG. 20 includes a first transistor 2001 for switching that controls input of a video signal (also referred to as a switching transistor), and a second transistor for driving that determines light emission / non-light emission of a light-emitting element based on the video signal. 2002 (also referred to as a driving transistor), a third transistor 2003 (also referred to as an erasing transistor) for erasing a voltage between the gate and the source of the second transistor, a light emitting element 2004, a storage capacitor 2005, a signal line 2006, a first transistor 1 scan line 2007, second scan line 2008, power supply line 2009, and counter electrode 2010. The storage capacitor 2005 is provided to more reliably hold the voltage (gate voltage) between the gate and the source of the first transistor 2001 and the second transistor 2002, but it is not necessarily provided. Note that the voltage in this specification means a potential difference from the ground unless otherwise specified. The light emitting element 2004 corresponds to the light emitting elements R1, R2, G1, G2, B1, and B2 in FIG.

  The first transistor 2001 is controlled using the first scan line 2007. When the first transistor 2001 is turned on, a video signal is input from the signal line 2006 to the storage capacitor 2005. Then, the second transistor 2002 is turned on / off according to the video signal, and a current flows from the power supply line 2009 through the light emitting element 2004 to the counter electrode 2010.

  When the signal is to be erased, the second scanning line 2008 is selected, the third transistor 2003 is turned on, and the second transistor 2002 is turned off. Then, current does not flow from the power supply line 2009 to the counter electrode 2010 through the light emitting element 2004. As a result, a non-lighting period can be created and the length of the lighting period can be freely controlled.

  Next, FIG. 21 shows a timing chart in the case of performing an operation of erasing the pixel signal. In this embodiment, as an example, a case where a 3-bit digital video signal is used in the digital time gray scale method as in FIG. 5 will be described. In the digital time gray scale method, one frame period 2101 is further divided into a plurality of subframe periods. Here, since it is 3 bits, it is divided into three subframe periods, and writing and display in each emission color are performed in each period.

  In FIG. 21, each subframe period has an address (write) period Ta # (# is a natural number) and a sustain (light emission) period Ts #. In FIG. 21, it can be seen that the address (writing) period and the sustain (light emission) period are not separated in each subframe period obtained by dividing one frame period 2101. That is, when writing in the i-th row is completed, light emission starts immediately in the i-th row. Thereafter, when writing is performed on the i + 1th row, the i-th row is already in the sustain (light emission) period. By setting such timing, the duty ratio can be increased.

  However, in the case of the timing shown in FIG. 21, when the sustain (light emission) period is shorter than the address (write) period, the address (write) period in a certain subframe period and the address (write) period in the next subframe period A period in which and overlap occurs. Therefore, as shown in FIG. 20, the erasing period Tr3 is forcibly used from the time when the sustain (light emission) period ends to the start of the next address (write) period using the third transistor. Is provided. By this erasing period, overlapping of address (writing) periods in different subframe periods can be avoided. Specifically, the second scan line driver circuit for controlling the third transistor is used to output an erasing selection pulse, and the third transistor is turned on at a desired timing in order from the first row. Turn it on. Note that the second scan line driver circuit may have the same configuration as the first scan line driver circuit which performs normal writing. Therefore, the period for writing the erasing signal (hereinafter referred to as a reset period) Te3 is equal in length to the address (writing) period.

  Note that although the case where the number of gradation display bits is equal to the number of subframes is described here as an example, it may be divided into a larger number of periods. Further, even if the ratio of the length of the sustain (light emission) period is not necessarily a power of 2, gradation expression is possible. In this manner, by adopting the pixel configuration shown in FIG. 20, the length of the lighting period can be easily controlled in each row.

  By adopting the pixel configuration as shown in FIG. 20, a plurality of subframes can be arranged in one frame even if the signal writing operation is slow. Further, when performing an erasing operation, it is not necessary to acquire erasing data in the same manner as a video signal, so that the driving frequency of the source driver can be reduced.

  Further, a field sequential method may be used in the pixel configurations of FIGS. In FIG. 22A, in the pixel configuration in FIG. 4, one frame period indicated by 2201 is divided into six periods indicated by 2202 to 2207, and writing and display are performed in each emission color in each period. . In FIG. 22B, in the pixel structure of FIG. 20, one frame period indicated by 2201 is divided into six periods indicated by 2202 to 2207, and writing and display in each emission color are performed in each period. Do.

  In FIGS. 22A and 22B, a case where a 3-bit digital video signal is used will be described as an example. In the case of the digital time gray scale method, the frame period 2201 is further divided into a plurality of subframe periods. Since it is 3 bits here, it is divided into three subframe periods.

  22A and 22B, the first period 2202, the second period 2203, the third period 2204, and the fourth period corresponding to the light emitting elements R1, R2, G1, G2, B1, and B2 are used. One period among the six periods indicated by the period 2205, the fifth period 2206, and the sixth period 2207, for example, the period of the first period 2202 will be described.

Note that the first period 2202 includes an address (writing) period Ta1 _# (# is a natural number) and a sustain (light emission) period Ts1 _# in each subframe period. The second period is an address (writing) period Ta2 _# (# is a natural number) and a sustain (light emission) period Ts2 _# , and the same applies to the third to sixth periods.

In FIG. 22A, the length of the sustain (light emission) period is Ts1 ₁ : Ts1 ₂ : Ts1 ₃ = 4: 2: 1, and light emission or non-light emission is controlled in each sustain (light emission) period. Thus, 2 ³ = 8 gradations are expressed. That is, the length of the sustain (light emission) period is set to _{2 such} as Ts1 ₁ : Ts1 ₂ : Ts1 ₃ = 2 ⁽ⁿ⁻¹⁾ : 2 ⁽ⁿ⁻²⁾ :...: 2 ¹ : 2 ⁰ The power ratio. For example, when only Ts1 ₃ emits light and Ts1 ₁ and Ts1 ₂ do not emit light, light is emitted only for about 14% of all the sustain (light emission) periods. That is, a luminance of about 14% can be expressed. When Ts1 ₁ and Ts1 ₂ emit light and Ts1 ₃ does not emit light, light is emitted for only about 86% of all the sustain (light emission) periods. That is, a luminance of about 86% can be expressed.

  As shown in FIG. 21, this operation is repeated in the first to sixth emission colors, that is, the light emitting element R1, the light emitting element R2, the light emitting element G1, the light emitting element G2, the light emitting element B1, and the light emitting element B2 in FIG. The viewer can visually recognize the multicolor expression by the afterimage effect.

  In FIG. 20, the third transistor 2003 is used; however, another method can be used. This is because it is only necessary to forcibly create a non-lighting period, so that no current is supplied to the light emitting element 2004. Therefore, a non-lighting period may be generated by disposing a switch in any of the paths through which current flows from the power supply line 2009 to the counter electrode 2010 through the light-emitting element 2004 and controlling on / off of the switch. Alternatively, the gate-source voltage of the second transistor 2002 may be controlled so that the second transistor is forcibly turned off.

  FIG. 23 shows an example of a pixel configuration in the case where the second transistor is forcibly turned off. A difference from FIG. 20 is that an erasing diode 2301 is connected between the gate of the second transistor 2002 and the second scanning line 2008.

  When the signal is to be erased, the second scanning line 2008 is selected (here, set to a high potential), the erasing diode 2301 is turned on, and the second scanning line 2008 is connected to the gate of the second transistor 2002. Allow current to flow. As a result, the second transistor 2002 is turned off. Then, no current flows from the power supply line 2009 to the counter electrode 2010 through the light emitting element 2004. As a result, a non-lighting period can be created and the length of the lighting period can be freely controlled.

  When it is desired to hold the signal, the second scanning line 2008 is not selected (here, set to a low potential). Then, the erasing diode 2301 is turned off, so that the gate potential of the second transistor 2002 is held.

  The erasing diode 2301 may be anything as long as it has a rectifying property. A PN-type diode, a PIN-type diode, a Schottky diode, or a Zener-type diode may be used.

  Alternatively, a transistor may be used by diode connection (gate and drain connected). A circuit diagram in that case is shown in FIG. As the erasing diode 2301, a diode-connected transistor 2401 is used. Here, an N-channel type is used, but the present invention is not limited to this. A P-channel type may be used.

Note that the timing chart, the pixel configuration, and the driving method shown in this embodiment mode are examples, and the present invention is not limited to this. The present invention can be applied to various timing charts, pixel configurations, and driving methods.

Next, the operation region of the driving transistor in the case of the digital gradation method will be described. FIG. 25 is a characteristic diagram of the operation of the transistor when the horizontal axis represents the voltage applied between the gate and the source of the transistor and the vertical axis represents the current flowing through the source and drain of the transistor.

For example, when operating in the saturation region, there is an advantage that even if the voltage-current characteristics of the light emitting element deteriorate, the value of the current flowing therethrough does not change. Therefore, the display device is not easily affected by burn-in. However, if the current characteristics of the driving transistor vary, the current flowing therethrough also varies. Therefore, display unevenness may occur.

On the other hand, when operating in the linear region, even if the current characteristics of the driving transistor vary, the value of the current flowing therethrough is not easily affected. For this reason, display unevenness is unlikely to occur. Further, since the gate-source voltage (absolute value) of the driving transistor does not become too large, the power consumption can be reduced.

Furthermore, if the gate-source voltage (the absolute value thereof) of the drive transistor is increased, even if the current characteristics of the drive transistor vary, the value of the current flowing therethrough is hardly affected. However, when the voltage-current characteristics of the light-emitting element deteriorate, the value of current flowing there may be changed. Therefore, the display device is easily affected by burn-in.

  In this manner, when the driving transistor is operated in the saturation region, the current value does not change even if the characteristics of the light emitting element change. Therefore, in that case, the driving transistor can be regarded as operating as a current source. Therefore, such driving is called constant current driving.

  Further, when the driving transistor is operated in the linear region, the current value does not change even if the current characteristics of the driving transistor vary. Therefore, in that case, the driving transistor can be regarded as operating as a switch. Therefore, it can be considered that the voltage of the power supply line is applied to the light emitting element as it is. Therefore, such driving is called constant voltage driving.

  The present invention can employ either constant current drive or constant voltage drive. Therefore, whether to use constant current driving or constant voltage driving may be changed as appropriate in consideration of variations in light emitting elements and transistors.

Note that this embodiment mode can be implemented freely combining with any description in the embodiments or embodiment modes in this specification.

(Embodiment 6)
In this embodiment mode, another structure of the layout of each pixel and each wiring in the present invention will be described.

  FIG. 26 shows a layout diagram of the circuit diagram shown in FIG. Note that the circuit diagram and layout diagram are not limited to FIG. 4 and FIG.

  Switching transistors 2601A and 2601B, drive transistors 2602A and 2602B, and electrodes of light emitting elements R1 and R2 are arranged. The sources and drains of the switching transistors 2601A and 2601B are connected to the signal line 2604 and the gate of the driving transistor 2602A or 2602B, respectively. The gate of the switching transistor 2601A is connected to the scanning line 2605A, and the gate of the switching transistor 2601B is connected to the scanning line 2605B. The sources and drains of the drive transistors 2602A and 2602B are connected to the power supply line 2606 and the electrodes of the light emitting elements R1 and R2, respectively. The storage capacitor (not shown) is connected between the gate of the driving transistor 2602A or 2602B and the power supply line 2606, but is not necessarily provided.

  Note that a plurality of signal lines 2604 may be provided corresponding to the driving transistors 2602A and 2602B.

  The signal line 2604 and the power supply line 2606 are formed by the second wiring, and the scanning lines 2605A and 2605B are formed by the first wiring.

FIG. 27 shows a top view of a pixel configuration corresponding to FIG. Reference numerals given to the components in FIG. 27 are the same as those in FIG.

  In FIG. 27, in the case of a top gate structure, a film is formed in the order of a substrate, a semiconductor layer, a gate insulating film, a first wiring, an interlayer insulating film, and a second wiring. In the case of the bottom gate structure, the film is formed in the order of the substrate, the first wiring, the gate insulating film, the semiconductor layer, the interlayer insulating film, and the second wiring. In FIG. 27, storage capacitors 2701A and 2701B are provided between the power supply line and the first wiring.

Note that a double gate structure in which two channel formation regions of the switching transistors 2601A and 2601B are formed has been described, but a single gate structure in which one channel formation region is formed or a triple gate structure in which three channel formation regions are formed. May be. Alternatively, a dual gate type or other structure having two gate electrodes disposed above and below the channel formation region with a gate insulating film interposed therebetween may be used.

  In FIG. 27, when the distance between the light emitting element R1 and the light emitting element R2 in the same picture element is D1, the distance between the light emitting element R1 and the light emitting element R2 in the picture element in another row is D2. According to the form of FIG. 27 in the present embodiment, the configuration is such that D1 <D2, and the distance between the light emitting element R1 and the light emitting element R2 in the same pixel can be reduced. In the present invention, the light emitting element R1 and the light emitting element are arranged by arranging them side by side in the column direction (vertical direction in FIG. 26) as shown in FIG. 27 and no scanning line between the light emitting element R1 and the light emitting element R2. This is preferable because the color mixture of the element R2 becomes easier to visually recognize. Needless to say, the light-emitting elements G1 and G2 and the light-emitting elements B1 and B2 have the same structure, which makes it easier to visually recognize the color mixture. In the case where the light emitting element R1 and the light emitting element R2 are arranged side by side in the row direction (the horizontal direction in FIG. 26), the light emitting element R1 and the light emitting element R1 are not emitted by not arranging the power supply line between the light emitting element R1 and the light emitting element R2. The element R2 is preferably arranged at a more adjacent position.

  In the pixel of FIG. 26, the scanning line 2605B can be replaced with the scanning line 2605A of the pixel in another row. That is, in that case, the scanning line 2605B of the display device illustrated in FIG. 26 can be omitted. As an example, FIG. 28 shows a configuration in which the scanning line 2605B of the pixel in FIG. 26 is omitted and the scanning line 2605A of the pixel in the adjacent row is substituted.

  The configuration of the display device shown in FIGS. 26 and 28 is an example, and the present invention is not limited to this. For example, the power supply line may not be arranged in parallel with the signal line, may be arranged in parallel with the scanning line, or each of the power supply lines may be arranged in a grid pattern. That is, as shown in FIG. 29, the power supply line in the pixel of FIG. 26 may be arranged in parallel with the scanning line.

  As described above, the configuration of the wiring around the pixel of the display device of the present invention is wide-ranging, and it is noted that the configuration is not particularly limited to the configurations listed in this specification.

  Note that this embodiment mode can be freely combined with any description in other embodiment modes and embodiments in this specification.

(Embodiment 7)
In this embodiment mode, a structure of a display panel having the pixel structure described in the above embodiment is described with reference to FIGS.

30A is a top view showing the display panel, and FIG. 30B is a cross-sectional view of FIG. 30A cut along A-A ′. The display panel includes a signal line driver circuit 3001, a pixel portion 3002, a first scan line driver circuit 3003, and a second scan line driver circuit 3006 indicated by dotted lines. In addition, a sealing substrate 3004 and a sealing material 3005 are provided, and an inner side surrounded by the sealing material 3005 is a space 3007.

  Note that the wiring 3008 is a wiring for transmitting a signal input to the first scan line driver circuit 3003, the second scan line driver circuit 3006, and the signal line driver circuit 3001, and is an FPC 3009 (flexible flexible terminal) serving as an external input terminal. Video signal, clock signal, start signal, etc. are received from the print circuit). An IC chip 3019 (a semiconductor chip on which a memory circuit, a buffer circuit, or the like is formed) is mounted on a connection portion between the FPC 3009 and the display panel by a COG (Chip On Glass) or the like. Although only the FPC is shown here, a printed wiring board (PWB) may be attached to the FPC. The display device in this specification includes not only a display panel body but also a state in which an FPC or a PWB is attached thereto. In addition, it is assumed that an IC chip or the like is mounted.

  Next, a cross-sectional structure will be described with reference to FIG. A pixel portion 3002 and its peripheral driver circuits (a first scan line driver circuit 3003, a second scan line driver circuit 3006, and a signal line driver circuit 3001) are formed over a substrate 3010. Here, a signal line A driving circuit 3001 and a pixel portion 3002 are shown.

  Note that the signal line driver circuit 3001 includes unipolar transistors such as an N-channel TFT 3020 and an N-channel TFT 3021. Note that in the case where a pixel is formed using a unipolar transistor as a pixel structure, a unipolar display panel can be manufactured by forming the peripheral driver circuit using an N-channel transistor. Of course, a CMOS circuit may be formed using not only a unipolar transistor but also a P-channel transistor. In this embodiment mode, a display panel in which a pixel portion and a peripheral driver circuit are formed over the same substrate is shown; however, the display panel is not necessarily required, and all or part of the peripheral driver circuit is formed on an IC chip or the like. It may be implemented with In that case, the driver circuit does not need to be unipolar and can be used in combination with a P-channel transistor.

  In addition, the pixel portion 3002 includes a TFT 3011 and a TFT 3012. Note that the source electrode of the TFT 3012 is connected to the first electrode 3013 (pixel electrode). An insulator 3014 is formed so as to cover an end portion of the first electrode 3013. Here, a positive photosensitive acrylic resin film is used.

  In order to improve the coverage, a curved surface having a curvature is formed at the upper end portion or the lower end portion of the insulator 3014. For example, in the case where positive photosensitive acrylic is used as a material for the insulator 3014, it is preferable that only the upper end portion of the insulator 3014 has a curved surface having a curvature radius (0.2 μm to 3 μm). As the insulator 3014, either a negative photoresist that becomes insoluble in an etchant by light or a positive photoresist that becomes soluble in an etchant by light can be used.

  A light emitting layer 3016 and a second electrode 3017 (counter electrode) are formed over the first electrode 3013, respectively. Here, as a material used for the first electrode 3013 which functions as an anode, a material having a high work function is preferably used. For example, in addition to single layer films such as ITO (indium tin oxide) film, indium zinc oxide (IZO) film, titanium nitride film, chromium film, tungsten film, Zn film, and Pt film, titanium nitride film and aluminum are mainly used. A laminate of a component film, a three-layer structure of a titanium nitride film, a film containing aluminum as a main component, and a titanium nitride film can be used. Note that with a stacked structure, resistance as a wiring is low, good ohmic contact can be obtained, and a function as an anode can be obtained.

  The light emitting layer 3016 is formed by an evaporation method using an evaporation mask or an inkjet method. For the light emitting layer 3016, a group 4 metal complex of the periodic table of elements is used as a part thereof, and other materials that can be used in combination are low molecular weight materials and high molecular weight materials. Also good. In addition, as a material used for the light-emitting layer, an organic compound is usually used in a single layer or a stacked layer, but in this embodiment, a structure in which an inorganic compound is used for part of a film formed of the organic compound is also included. And Further, a known triplet material can be used.

Further, a material used for the second electrode 3017 formed over the light-emitting layer 3016 includes a material having a low work function (Al, Ag, Li, Ca, or an alloy thereof such as MgAg, MgIn, AlLi, CaF ₂ , or nitridation. Calcium) may be used. Note that in the case where light generated in the light-emitting layer 3016 is transmitted through the second electrode 3017, a thin metal film and a transparent conductive film (ITO (indium oxide oxide) are used as the second electrode 3017 (cathode). It is preferable to use a stack of a tin alloy), an indium zinc oxide alloy (In ₂ O ₃ —ZnO), zinc oxide (ZnO), or the like).

  Further, the sealing substrate 3004 and the substrate 3010 are attached to each other with the sealant 3005, so that the light-emitting element 3018 is provided in a space 3007 surrounded by the substrate 3010, the sealing substrate 3004, and the sealant 3005. Note that the space 3007 includes a structure filled with a sealing material 3005 in addition to a case where the space 3007 is filled with an inert gas (nitrogen, argon, or the like).

  Note that an epoxy-based resin is preferably used for the sealant 3005. Moreover, it is desirable that these materials are materials that do not transmit moisture and oxygen as much as possible. In addition to a glass substrate or a quartz substrate, a plastic substrate made of FRP (Fiberglass-Reinforced Plastics), PVF (polyvinyl fluoride), Mylar, polyester, acrylic, or the like can be used as a material used for the sealing substrate 3004.

  As described above, a display panel having the pixel configuration of the present invention can be obtained. Note that the above-described configuration is an example, and the configuration of the display panel of the present invention is not limited to this.

As shown in FIG. 30, the signal line driver circuit 3001, the pixel portion 3002, the first scan line driver circuit 3003, and the second scan line driver circuit 3006 are formed over the same substrate, thereby reducing the cost of the display device. Can be planned. In this case, the manufacturing process can be simplified by making transistors used in the signal line driver circuit 3001, the pixel portion 3002, the first scan line driver circuit 3003, and the second scan line driver circuit 3006 unipolar. Therefore, further cost reduction can be achieved.

Note that as the structure of the display panel, as shown in FIG. 30A, the signal line driver circuit 3001, the pixel portion 3002, the first scan line driver circuit 3003, and the second scan line driver circuit 3006 are formed over the same substrate. The signal line driver circuit 3101 shown in FIG. 31 corresponding to the signal line driver circuit 3001 may be formed over the IC chip and mounted on the display panel with COG or the like. Note that the substrate 3100, the pixel portion 3102, the first scan line driver circuit 3103, the second scan line driver circuit 3104, the FPC 3105, the IC chip 3106, the IC chip 3107, the sealing substrate 3108, and the sealing material in FIG. 3109 corresponds to the substrate 3010, the pixel portion 3002, the first scan line driver circuit 3003, the second scan line driver circuit 3006, the FPC 3009, the IC chip 3019, the sealing substrate 3004, and the sealant 3005 in FIG. .

That is, only a signal line driver circuit that requires high-speed operation is formed on an IC chip using a CMOS or the like to reduce power consumption. Further, by using a semiconductor chip such as a silicon wafer as the IC chip, higher speed operation and lower power consumption can be achieved.

Further, by using the same substrate as the pixel portion 3102 for the first scan line driver circuit 3103 and the second scan line driver circuit 3104, cost reduction can be achieved. Further, the second scan line driver circuit 3103, the second scan line driver circuit 3104, and the pixel portion 3102 are formed of unipolar transistors, so that cost can be further reduced. As the structure of the pixel included in the pixel portion 3102, the pixel described in any of Embodiments 1, 2, 3, and 4 can be used.

Thus, the cost of a high-definition display device can be reduced. Further, by mounting an IC chip on which a functional circuit (memory or buffer) is formed at a connection portion between the FPC 3105 and the substrate 3100, the substrate area can be effectively used.

Further, the signal line driver circuit 3111 in FIG. 31B corresponding to the signal line driver circuit 3001, the first scan line driver circuit 3003, and the second scan line driver circuit 3006 in FIG. The line driver circuit 3114 and the second scan line driver circuit 3113 may be formed over an IC chip and mounted on the display panel with COG or the like. In this case, a high-definition display device can have lower power consumption. Therefore, in order to obtain a display device with lower power consumption, it is preferable to use polysilicon for a semiconductor layer of a transistor used in the pixel portion. Note that the substrate 3110, the pixel portion 3112, the FPC 3115, the IC chip 3116, the IC chip 3117, the sealing substrate 3118, and the sealing material 3119 in FIG. 31B are the substrate 3010, the pixel portion 3002, the FPC 3009, and the IC in FIG. It corresponds to a chip 3019, a sealing substrate 3004, and a sealant 3005.

In addition, cost can be reduced by using amorphous silicon for the semiconductor layer of the transistor in the pixel portion 3112. Further, a large display panel can be manufactured.

Further, the second scan line driver circuit, the first scan line driver circuit, and the signal line driver circuit are not necessarily provided in the row direction and the column direction of the pixels. For example, as shown in FIG. 32A, the peripheral drive circuit 3201 formed on the IC chip has a first scan line drive circuit 3114, a second scan line drive circuit 3113, and a signal shown in FIG. The function of the line driver circuit 3111 may be provided. Note that the substrate 3200, the pixel portion 3202, the FPC 3204, the IC chip 3205, the IC chip 3206, the sealing substrate 3207, and the sealant 3208 in FIG. 32A are the substrate 3010, the pixel portion 3002, the FPC 3009, and the IC in FIG. It corresponds to a chip 3019, a sealing substrate 3004, and a sealant 3005.

FIG. 32B is a schematic diagram for explaining wiring connection of the display device in FIG. The display device includes a substrate 3210, a peripheral driver circuit 3211, a pixel portion 3212, an FPC 3213, and an FPC 3214. An external signal and a power supply potential are input to the peripheral driver circuit 3211 from the FPC 3213. Then, an output from the peripheral driver circuit 3211 is input to a wiring in a row direction and a column direction connected to the pixel included in the pixel portion 3212.

  As described above, the configuration of the display panel in the display device of the present invention is various, and it is added that the configuration is not particularly limited to the configurations listed in this specification.

  Note that this embodiment mode can be freely combined with any description in other embodiment modes and embodiments in this specification.

(Embodiment 8)
In this embodiment mode, another structure of the cross-sectional structure of each pixel and transistor in the present invention is described.

  FIG. 44 shows an example of a circuit diagram in this embodiment. Note that the circuit diagram is not limited to FIG. The circuit diagrams listed in FIG. 44 are circuit diagrams configured using N-type transistors. By forming a circuit that forms a pixel with an N-type transistor, a display device that can handle a large-area substrate with a simple process can be provided. Specific examples will be described below.

  FIG. 44A shows a circuit configuration. A pixel includes a first transistor 4401, a second transistor 4402, and a light emitting element 4406. A signal line 4403 to which a video signal is input and a gate of the second transistor 4402 are connected to the first transistor 4401. Connected through. A scanning line 4407 is connected to the gate of the first transistor 4401. A second transistor 4402 and a light emitting element 4406 are connected between the first power supply line 4404 and the second power supply line 4405. Then, current flows from the first power supply line 4404 to the second power supply line 4405. The light emitting element 4406 emits light according to the magnitude of current flowing therethrough.

  Note that a storage capacitor may be provided in order to hold a video signal input to the gate of the second transistor 4402. In that case, a storage capacitor may be provided between the gate of the second transistor 4402 and the drain of the second transistor 4402, or between the gate of the second transistor 4402 and the source of the second transistor 4402. A holding capacitor may be arranged between them. Alternatively, a storage capacitor may be provided between the gate of the second transistor 4402 and another wiring (a dedicated wiring, a scan line of a pixel in the previous row, or the like). Alternatively, the storage capacitor may not be provided due to the gate capacitance of the second transistor 4402. Note that the second transistor 4402 and the first transistor 4401 are n-channel transistors.

FIG. 44B illustrates another circuit configuration of this embodiment. A pixel includes a first transistor 6001, a second transistor 6002, a third transistor 6009 (also referred to as a holding transistor), a holding capacitor 6010, and a light-emitting element 6006, and a signal line 6003 through which a video signal is input. And the source of the second transistor 6002 are connected to each other through the first transistor 6001. A scanning line 6007 is connected to the gate of the first transistor 6001. A second transistor 6002 and a light emitting element 6006 are connected between the first power supply line 6004 and the second power supply line 6005. Then, a current flows from the first power supply line 6004 to the second power supply line 6005. The light emitting element 6006 emits light according to the amount of current flowing therethrough. A storage capacitor 6010 is disposed between the gate and the source of the second transistor 6002, and a third transistor 6009 is connected between the gate and the drain of the second transistor 6002. A scanning line 6007 is connected to the gate of the third transistor 6009.

  A current source circuit 6008 is disposed in the signal line driver circuit. The current source circuit 6008 supplies a current having a magnitude corresponding to the video signal to the pixel. Then, the video signal supplied to the source signal line 6003 when the scan line 6007 is selected is input to the second transistor 6002. At this time, since the potential of the first power supply line 6004 is changed, no current flows through the light emitting element 6006 because of the potential relationship between the first power supply line 6004 and the second power supply line 6005. Then, the gate-source voltage of the second transistor 6002 having a necessary magnitude is held in the holding capacitor 6010 in accordance with the magnitude of the video signal. After that, the scanning line 6007 is in a non-selected state, and the charge accumulated in the storage capacitor 6010 is held. Therefore, even when the drain potential or the source potential of the second transistor 6002 changes, the gate-source voltage of the second transistor 6002 does not change. Then, the potential of the first power supply line 6004 returns to the original state, a current having a magnitude corresponding to the video signal flows through the second transistor 6002, and also flows through the light emitting element 6006.

  FIG. 44C illustrates another circuit configuration of this embodiment. A pixel includes a first transistor 7001, a second transistor 7002, a third transistor 7009, a storage capacitor 7010, and a light-emitting element 7006. A signal line 7003 to which a video signal is input and a second transistor 7002 are provided. Is connected to the first gate via a first transistor 7001. A first scanning line 7007 is connected to a gate of the first transistor 7001. A second transistor 7002 and a light emitting element 7006 are connected between the first power supply line 7004 and the second power supply line 7005. A current flows from the first power supply line 7004 to the second power supply line 7005. The light emitting element 7006 emits light according to the magnitude of current flowing therethrough. A storage capacitor 7010 is disposed between the gate and the source of the second transistor 7002, and a third transistor 7009 is connected between the gate and the drain of the second transistor 7002. A second scan line 7016 is connected to the gate of the third transistor 7009.

  In the circuit configuration illustrated in FIG. 44C, the third transistor 7009 is turned on in accordance with a signal input from the second scan line 7016. Then, the gate-source voltage of the second transistor 7002 corresponding to the threshold voltage of the second transistor 7002 is held in the storage capacitor 7010. Therefore, variations in the threshold voltage of each drive voltage can be corrected in advance. Note that a voltage higher than the threshold voltage may be held in the storage capacitor 7010 in advance by increasing the potential of the second power supply line 7005 for a moment.

  Then, the video signal supplied to the signal line 7003 is input to the gate of the second transistor 7002. Then, current flows through the second transistor 7002 and also flows through the light-emitting element 7006 in accordance with the magnitude of the video signal.

  44A to 44C, the second transistor may be operated only in the saturation region, may be operated in the saturation region and the linear region, or may be operated only in the linear region. May be.

  When operating only in the linear region, the second transistor generally operates as a switch. Therefore, it is difficult for the switching operation to be affected by the characteristic variation due to deterioration or temperature of the second transistor. When operating only in the linear region, it is often digitally controlled whether or not a current flows through the light emitting element 7006. In that case, in order to increase the number of gradations, it may be dealt with by combining a time gradation method or an area gradation method.

  Next, the case where an amorphous silicon (a-Si: H) film is used for the semiconductor layer of the transistor in the circuit configuration shown in FIG. 42 shows a case of a top gate transistor, and FIGS. 43 and 49 show a case of a bottom gate transistor.

FIG. 42A shows a cross section of a forward staggered transistor using amorphous silicon as a semiconductor layer. As shown in FIG. 42A, a base film 7602 is formed on a substrate 7601. Further, a pixel electrode 7603 is formed over the base film 7602. In addition, a first electrode 7604 made of the same material is formed in the same layer as the pixel electrode 7603.

As the substrate, a glass substrate, a quartz substrate, a ceramic substrate, a plastic substrate, or the like can be used. The base film 7602 can be formed using a single layer such as aluminum nitride (AlN), silicon oxide (SiO ₂ ), or silicon oxynitride (SiO _x N _y ), or a stacked layer thereof.

Further, a wiring 7605 and a wiring 7606 are formed over the base film 7602, and an end portion of the pixel electrode 7603 is covered with the wiring 7605. An N-type semiconductor layer 7607 and an N-type semiconductor layer 7608 having an N-type conductivity are formed over the wirings 7605 and 7606. A semiconductor layer 7609 is formed between the wiring 7605 and the wiring 7606 and over the base film 7602. A part of the semiconductor layer 7609 extends to the N-type semiconductor layer 7607 and the N-type semiconductor layer 7608. Note that this semiconductor layer 7609 is formed using a non-crystalline semiconductor film such as amorphous silicon (a-Si: H) or microcrystalline semiconductor (μ-Si: H). In addition, a gate insulating film 7610 is formed over the semiconductor layer 7609. An insulating film 7611 made of the same material and in the same layer as the gate insulating film 7610 is also formed over the first electrode 7604. Note that a silicon oxide film, a silicon nitride film, or the like is used as the gate insulating film 7610.

  A gate electrode 7612 is formed over the gate insulating film 7610. A second electrode 7613 made of the same material and in the same layer as the gate electrode 7612 is formed over the first electrode 7604 with an insulating film 7611 interposed therebetween. A storage capacitor 7619 is formed by sandwiching an insulating film 7611 between the first electrode 7604 and the second electrode 7613. Further, an interlayer insulator 7614 is formed to cover an end portion of the pixel electrode 7603, the driving transistor 7618, and the storage capacitor 7619.

A light-emitting layer 7615 and a counter electrode 7616 are formed over the interlayer insulator 7614 and the pixel electrode 7603 located in the opening thereof, and a light-emitting element 7617 is formed in a region where the light-emitting layer 7615 is sandwiched between the pixel electrode 7603 and the counter electrode 7616. Has been.

Further, the first electrode 7604 illustrated in FIG. 42A may be formed using the first electrode 7620 as illustrated in FIG. The first electrode 7620 is formed using the same material in the same layer as the wirings 7605 and 7606.

FIG. 43 shows a partial cross section of a display panel using a bottom-gate transistor using amorphous silicon as a semiconductor layer.

  A base film 7702 is formed over the substrate 7701. Further, a gate electrode 7703 is formed over the base film 7702. In addition, a first electrode 7704 made of the same material is formed in the same layer as the gate electrode 7703. As a material for the gate electrode 7703, polycrystalline silicon to which phosphorus is added can be used. In addition to polycrystalline silicon, silicide which is a compound of metal and silicon may be used.

A gate insulating film 7705 is formed so as to cover the gate electrode 7703 and the first electrode 7704. As the gate insulating film 7705, a silicon oxide film, a silicon nitride film, or the like is used.

  In addition, a semiconductor layer 7706 is formed over the gate insulating film 7705. In addition, a semiconductor layer 7707 made of the same material is formed in the same layer as the semiconductor layer 7706.

As the substrate, a glass substrate, a quartz substrate, a ceramic substrate, a plastic substrate, or the like can be used. For the base film 7702, a single layer such as aluminum nitride (AlN), silicon oxide (SiO ₂ ), or silicon oxynitride (SiO _x N _y ), or a stacked layer thereof can be used.

N-type semiconductor layers 7708 and 7709 having N-type conductivity are formed over the semiconductor layer 7706, and an N-type semiconductor layer 7710 is formed over the semiconductor layer 7707.

Wirings 7711, 7712, and 7713 are formed over the N-type semiconductor layers 7708, 7709, and 7710, respectively, and a conductive layer 7713 made of the same material as the wirings 7711 and 7712 is formed over the N-type semiconductor layer 7710. Yes.

A second electrode including the semiconductor layer 7707, the N-type semiconductor layer 7710, and the conductive layer 7713 is formed. Note that a storage capacitor 7720 having a structure in which the gate insulating film 7705 is sandwiched between the second electrode and the first electrode 7704 is formed.

In addition, one end portion of the wiring 7711 extends, and a pixel electrode 7714 is formed in contact with the upper portion of the extended wiring 7711.

In addition, an insulator 7715 is formed so as to cover the end portion of the pixel electrode 7714, the driving transistor 7719, and the storage capacitor 7720.

A light emitting layer 7716 and a counter electrode 7717 are formed over the pixel electrode 7714 and the insulator 7715, and a light emitting element 7718 is formed in a region where the light emitting layer 7716 is sandwiched between the pixel electrode 7714 and the counter electrode 7717.

The semiconductor layer 7707 and the N-type semiconductor layer 7710 which are part of the second electrode of the storage capacitor are not necessarily provided. In other words, the second electrode may be the conductive layer 7713 and the storage capacitor may have a structure in which the gate insulating film is sandwiched between the first electrode 7704 and the conductive layer 7713.

Note that in FIG. 43A, by forming the pixel electrode 7714 before forming the wiring 7711, the second electrode made of the same material in the same layer as the pixel electrode 7714 as shown in FIG. A storage capacitor 7720 having a structure in which the gate insulating film 7705 is sandwiched between 7721 and the first electrode 7704 can be formed.

Note that although an inverted staggered channel-etched transistor is shown in FIG. 43, a channel-protective transistor may of course be used. The case of a transistor having a channel protective structure will be described with reference to FIGS.

A transistor with a channel protective structure shown in FIG. 49A is an insulator 7801 serving as an etching mask over a region where a channel of the semiconductor layer 7706 of the driving transistor 7719 having the channel etch structure shown in FIG. Are different from each other, and other common parts use common reference numerals.

Similarly, in the channel protection type transistor shown in FIG. 49B, an etching mask is formed over a region where the channel of the semiconductor layer 7706 of the channel etching structure driving transistor 7719 shown in FIG. 43B is formed. The difference is that an insulator 7802 is provided, and common points are used for other common parts.

By using an amorphous semiconductor film for a semiconductor layer (a channel formation region, a source region, a drain region, or the like) of a transistor included in the pixel of the present invention, manufacturing cost can be reduced. For example, an amorphous semiconductor film can be used by using the pixel structure shown in FIG.

  Note that this embodiment mode can be freely combined with any description in other embodiment modes and embodiments in this specification.

(Embodiment 9)
In this embodiment, a structure of a passive display panel that can be applied to the present invention will be described.

  FIG. 47A is a diagram illustrating a top view of the pixel portion before sealing. FIG. 47B is a cross-sectional view taken along the chain line AA ′ in FIG. FIG. 47C is a cross-sectional view taken along −B ′.

  On the substrate 2110, a plurality of first electrodes 2113 are arranged in stripes at equal intervals. A partition 2114 having an opening corresponding to each pixel is provided over the first electrode 2113, and the partition 2114 having the opening has a light-shielding material (photosensitive material in which a black pigment or carbon black is dispersed). Or a non-photosensitive organic material (polyimide, acrylic, polyamide, polyimide amide, resist or benzocyclobutene) or SOG film (for example, an SiOx film containing an alkyl group). For example, a material such as COLOR MOSAIC CK (trade name) manufactured by Fuji Film Orin Co., Ltd. is used as the partition wall 2114 having an opening. A partition 2114 having an opening functions as a black matrix (BM). Note that an opening corresponding to each pixel is a light emitting region 2121.

A plurality of reverse-tapered partition walls 2122 that are parallel to each other and intersect with the first electrode 2113 are provided over the partition wall 2114 having an opening. The reverse-tapered partition wall 2122 is formed by using a positive photosensitive resin in which an unexposed portion remains as a pattern in accordance with a photolithography method, and adjusting the exposure amount or development time so that the lower portion of the pattern is etched more. . This inversely tapered partition wall 2122 may also be formed of the above-described light-shielding material to further improve the contrast.

  FIG. 48 is a perspective view immediately after forming a plurality of parallel reverse-tapered partition walls 2122. Note that the same reference numerals are used for the same parts as in FIG.

  The height of the inversely tapered partition wall 2122 is set larger than the thickness of the film containing an organic compound and the conductive film. When a film containing an organic compound and a conductive film are stacked over the first substrate having the structure shown in FIG. 48, the first substrate is separated into a plurality of electrically independent regions as shown in FIG. , A second electrode 2116 is formed. The second electrode 2116 is a striped electrode parallel to each other and extending in a direction intersecting the first electrode 2113. Note that a film containing an organic compound and a conductive film are also formed over the reverse-tapered partition wall 2122; however, the light-emitting layer 2115R, the light-emitting layer 2115G, the light-emitting layer 2115B, and the second electrode 2116 are separated.

  Note that in this embodiment mode, the first light emitting element R1 in the present invention is the light emitting layer 2115R, the third light emitting element G1 in the present invention is the light emitting layer 2115G, and the fifth light emitting element B1 in the present invention is the light emitting layer 2115B. Correspond. Note that in this embodiment mode, the second light-emitting element R2 in the present invention is a region under the light-emitting layer 2115R in FIG. 47A, and the fourth light-emitting element G2 in the present invention is a light-emitting layer in FIG. 47A. The region below 2115G, the sixth light emitting element B2 in the present invention, corresponds to the region below the light emitting layer 2115B in FIG. Regarding the means for making the emission spectra different between the light emitting element R1 and the light emitting element R2, the light emitting element G1 and the light emitting element G2, and the light emitting element B1 and the light emitting element B2, the materials of the light emitting elements may be different. The thickness may be different, or it may be achieved by using a color filter or a color conversion layer having different transmission characteristics. In this embodiment, the light-emitting layer 2115R, the light-emitting layer 2115G, and the light-emitting layer 2115B will be described, and description of all pixels will be omitted.

  Here, an example is shown in which a light-emitting layer 2115R, a light-emitting layer 2115G, and a light-emitting layer 2115B are selectively formed to form a light-emitting device capable of full-color display capable of obtaining three types (R, G, and B) of light emission. The light emitting layer 2115R, the light emitting layer 2115G, and the light emitting layer 2115B are formed in stripe patterns parallel to each other.

  In addition, the light-emitting element is sealed by bonding the second substrate with a sealant. If necessary, a protective film covering the second electrode 2116 may be formed. Note that the second substrate is preferably a substrate having a high barrier property against moisture. Further, if necessary, a desiccant may be disposed in a region surrounded by the sealing material.

  FIG. 50 shows a top view of a light emitting module on which an FPC or the like is mounted after sealing.

Note that a light-emitting device in this specification refers to an image display device, a light-emitting device, or a light source (including a lighting device). In addition, a module in which a connector such as an FPC (Flexible Printed Circuit) or TAB (Tape Automated Bonding) tape or TCP (Tape Carrier Package) is attached to the light emitting device, or a printed wiring board provided on the end of the TAB tape or TCP In addition, a module in which an IC (integrated circuit) is directly mounted on a light emitting element by a COG (Chip On Glass) method is also included in the light emitting device.

A first substrate 5001 and a second substrate 5010 are attached with a sealant 5011 so as to face each other. As the sealant 5011, a photo-curing resin may be used, and a material with low degassing and low hygroscopicity is preferable. Further, the sealant 5011 may be added with a filler (a rod-like or fiber-like spacer) or a spherical spacer in order to keep the substrate interval constant. Note that the second substrate 5010 is preferably formed using a material having the same thermal expansion coefficient as that of the first substrate 5001, and glass (including quartz glass) or plastic can be used.

As shown in FIG. 50, in the pixel portion that performs image display, the column signal line group and the row signal line group intersect so that they are orthogonal to each other.

  The first electrode 2113 in FIG. 47 corresponds to the column signal line 5002 in FIG. 50, the second electrode 2116 in FIG. 47 corresponds to the row signal line 5003, and the inversely tapered partition 2122 in FIG. Equivalent to. A light emitting layer is sandwiched between the column signal line 5002 and the row signal line 5003, and the intersection 5005 corresponds to one pixel.

  Note that the row signal line 5003 is electrically connected to a connection wiring 5008 at a wiring end, and the connection wiring 5008 is connected to the FPC 5009b through an input terminal 5007. The column signal line 5002 is connected to the FPC 5009a through the input terminal 5006.

  Further, if necessary, an optical film such as a polarizing plate or a circular polarizing plate (including an elliptical polarizing plate), a retardation plate (λ / 4 plate, λ / 2 plate), a color filter, etc. is appropriately provided on the exit surface. Also good. Further, an antireflection film may be provided on the polarizing plate or the circularly polarizing plate. For example, anti-glare treatment can be performed that diffuses reflected light due to surface irregularities and reduces reflection. Moreover, you may perform the anti-reflection process which heat-processes to a polarizing plate or a circularly-polarizing plate. Thereafter, in order to protect from external impact, a hard coat treatment may be performed. However, when a polarizing plate or a circularly polarizing plate is used, the light extraction efficiency decreases due to the polarizing plate or the circularly polarizing plate. In addition, the cost of the polarizing plate or the circularly polarizing plate itself is high and easily deteriorates.

  In this embodiment, a black partition (also referred to as a bank or a barrier) serving as a black matrix (BM) is provided between pixels on a substrate side where a light-emitting element is provided to absorb stray light from the light-emitting element, or The contrast of display can be improved by shielding.

  Note that this embodiment mode can be freely combined with any description in other embodiment modes and embodiments in this specification.

(Embodiment 10)
In this embodiment mode, another structure of the light-emitting element of the present invention will be described.

  Although the light-emitting element described in the above embodiment is mainly an organic electroluminescence (EL) element, it is not limited thereto.

  For example, DMD (Digital Micromirror Device), PDP (Plasma Display Panel), FED (Field Emission Display; Field Emission Display), SED (Surface-Declide-on-Discrete-on-Discrete-on-Disc) ), An electrophoretic display device (electronic paper), or a piezoelectric ceramic display.

  Among the light-emitting elements listed above, elements that can recognize colors by transmitting light may be displayed through a color filter as described in Embodiment Mode 3. The light emitting element R1 of the first pixel and the light emitting element R2 of the second pixel, the light emitting element G1 of the third pixel, the light emitting element G2 of the fourth pixel, the light emitting element B1 of the fifth pixel, and the sixth pixel. The light emission spectra of the light emitting element B2 are made different. As a result, when expressed in the CIE-XY chromaticity diagram, the coordinates of the chromaticity diagram are represented by the light emitting elements R1, R2, the third pixel, and the fourth pixel provided in the first pixel and the second pixel. The light emitting elements G1 and G2 provided, the fifth pixel, and the light emitting elements B1 and B2 provided in the sixth pixel may be different.

  Of the light-emitting elements listed above, self-luminous elements may be color-converted with a phosphor or the like for display. The light emitting element R1 of the first pixel and the light emitting element R2 of the second pixel, the light emitting element G1 of the third pixel, the light emitting element G2 of the fourth pixel, the light emitting element B1 of the fifth pixel, and the sixth pixel. The light emission spectra of the light emitting element B2 are made different. As a result, when expressed in the CIE-XY chromaticity diagram, the coordinates of the chromaticity diagram are represented by the light emitting elements R1, R2, the third pixel, and the fourth pixel provided in the first pixel and the second pixel. The light emitting elements G1 and G2 provided, the fifth pixel, and the light emitting elements B1 and B2 provided in the sixth pixel may be different.

  Note that this embodiment mode can be freely combined with any description in other embodiment modes and embodiments in this specification.

The display device of the present invention can be applied to various electronic devices. Specifically, it can be applied to a display portion of an electronic device. Such electronic devices include video cameras, digital cameras, goggles-type displays, navigation systems, sound playback devices (car audio, audio components, etc.), computers, game devices, portable information terminals (mobile computers, mobile phones, portable games) Or an image reproducing apparatus (specifically, an apparatus having a display capable of reproducing a recording medium such as a digital versatile disc (DVD) and displaying the image). .

FIG. 38A shows a display which includes a housing 38101, a support base 38102, a display portion 38103, and the like. A display device having the pixel structure of the present invention can be used for the display portion 38103. The display includes all display devices for displaying information such as for personal computers, for receiving television broadcasts, and for displaying advertisements. A display using the display device of the present invention for the display portion 38103 can express bright colors.

In recent years, the need for high added value of displays has been increasing. Therefore, how to reduce the manufacturing cost and express vivid colors becomes an issue.

For example, by using the pixel configuration in FIG. 2 or the like for the pixel portion of the display panel, a display panel that can express vivid colors can be provided.

In addition, as shown in FIG. 30A, a display panel with reduced manufacturing costs can be formed by forming a pixel portion and a peripheral driver circuit over the same substrate.

Further, by using an amorphous semiconductor (eg, amorphous silicon (a-Si: H)) for a semiconductor layer of a transistor in a circuit included in the pixel portion, the process can be simplified and further cost reduction can be achieved. In this case, as shown in FIGS. 31B and 32A, a driver circuit around the pixel portion is preferably formed on the IC chip and mounted on the display panel by COG or the like. Thus, the use of an amorphous semiconductor makes it easy to increase the size of the display.

FIG. 38B shows a camera, which includes a main body 38201, a display portion 38202, an image receiving portion 38203, operation keys 38204, an external connection port 38205, a shutter 38206, and the like.

In recent years, production competition has intensified along with the improvement in performance of digital cameras and the like. And how to keep high-performance products at low prices is important. A digital camera using the display device of the present invention for the display portion 38202 can express vivid colors.

For example, as shown in FIG. 31A, a signal line driver circuit with a high operating speed is formed on an IC chip, and a scanning line driver circuit with a relatively low operating speed is formed of a unipolar transistor together with a pixel portion. By forming the circuit on the same substrate, high performance can be realized and cost can be reduced. Further, by applying an amorphous semiconductor, for example, amorphous silicon, to a semiconductor portion of a transistor used in a pixel portion and a scan line driver circuit which is integrally formed with the pixel portion, cost can be further reduced.

  FIG. 38C illustrates a computer, which includes a main body 38301, a housing 38302, a display portion 38303, a keyboard 38304, an external connection port 38305, a pointing device 38306, and the like. A computer using the display device of the present invention for the display portion 38303 can express vivid colors.

  FIG. 38D illustrates a mobile computer, which includes a main body 38401, a display portion 38402, a switch 38403, operation keys 38404, an infrared port 38405, and the like. A mobile computer using the display device of the present invention for the display portion 38402 can express vivid colors.

FIG. 38E shows a portable image reproducing device (specifically, a DVD reproducing device) provided with a recording medium, which includes a main body 38501, a housing 38502, a display portion A38503, a display portion B38504, a recording medium (DVD, etc.). A reading unit 38505, operation keys 38506, a speaker unit 38507, and the like are included. The display portion A38503 can mainly display image information, and the display portion B38504 can mainly display character information. An image reproduction device using the display device of the present invention for the display portion A 38503 or the display portion B 38504 can express vivid colors.

  FIG. 38F illustrates a goggle type display including a main body 38601, a display portion 38602, an earphone 38603, a support portion 38604, and the like. A goggle type display using the display device of the present invention for the display portion 38602 can express vivid colors.

  FIG. 38G illustrates a portable game machine including a housing 38701, a display portion 38702, speaker portions 38703, operation keys 38704, a storage medium insert portion 38705, and the like. A portable game machine using the display device of the present invention for the display portion 38702 can express bright colors.

  FIG. 38H illustrates a digital camera with a television receiving function, which includes a main body 38801, a display portion 38802, operation keys 38803, speakers 38804, a shutter 38805, an image receiving portion 38806, an antenna 38807, and the like. A digital camera with a television receiver function using the display device of the present invention for the display portion 38802 can express vivid colors.

Such a digital camera with a television receiving function that is multifunctional is required to be usable for a long time by a single charge, while increasing the frequency of use for viewing the television.

For example, as shown in FIGS. 31B and 32A, it is possible to reduce power consumption by forming a peripheral drive circuit on an IC chip and using a CMOS or the like.

  Thus, the present invention can be applied to all electronic devices.

  Note that this embodiment can be implemented freely combining with any description in the other embodiments and examples in this specification.

In this embodiment, a structure example of a cellular phone including a display device using the pixel structure of the present invention in a display portion will be described with reference to FIG.

  A display panel 3701 is incorporated in a housing 3730 so as to be detachable. The shape and dimensions of the housing 3730 can be changed as appropriate in accordance with the size of the display panel 3701. A housing 3730 to which the display panel 3701 is fixed is fitted into a printed board 3731 and assembled as a module.

  The display panel 3701 is connected to the printed board 3731 through the FPC 3713. A signal processing circuit 3735 including a speaker 3732, a microphone 3733, a transmission / reception circuit 3734, a CPU, a controller, and the like is formed over the printed board 3731. Such a module, the input means 3736, and the battery 3737 are combined and stored in a housing 3739. The pixel portion of the display panel 3701 is arranged so that it can be seen from an opening window formed in the housing 3739.

  In the display panel 3701, a pixel portion and some peripheral driver circuits (a driver circuit having a low operating frequency among a plurality of driver circuits) are integrally formed using a TFT over a substrate, and some peripheral driver circuits (a plurality of driver circuits) are formed. A driving circuit having a high operating frequency among the circuits) may be formed over an IC chip, and the IC chip may be mounted on the display panel 3701 by COG (Chip On Glass). Alternatively, the IC chip may be connected to the glass substrate using TAB (Tape Auto Bonding) or a printed board. With such a structure, the power consumption of the display device can be reduced, and the usage time by one charge of the mobile phone can be extended. In addition, the cost of the mobile phone can be reduced.

  In addition, the display device described in the above embodiment can be applied as appropriate to the pixel portion.

  For example, in order to reduce power consumption, as shown in FIGS. 31B and 32A, a pixel portion is formed on a substrate using TFTs, and all peripheral drive circuits are formed on an IC chip. The IC chip may be mounted on the display panel by COG (Chip On Glass) or the like.

  Further, the configuration shown in this embodiment is an example of a mobile phone, and the display device of the present invention is not limited to the mobile phone having such a configuration, and can be applied to mobile phones having various configurations. A vivid color can be expressed by providing the display device of the present invention.

In this embodiment, an example of a structure of an electronic device having a display device using the pixel structure of the present invention in a display portion, particularly a television receiver including an EL module will be described.

  FIG. 33 shows an EL module in which a display panel 3301 and a circuit board 3311 are combined. The display panel 3301 includes a pixel portion 3302, a scan line driver circuit 3303, and a signal line driver circuit 3304. On the circuit board 3311, for example, a control circuit 3312, a signal dividing circuit 3313, and the like are formed. The display panel 3301 and the circuit board 3311 are connected by a connection wiring 3314. An FPC or the like can be used for the connection wiring.

In the display panel 3301, a pixel portion and some peripheral driver circuits (a driver circuit having a low operating frequency among a plurality of driver circuits) are formed over the same substrate using TFTs, and some peripheral driver circuits (a plurality of driver circuits) are formed. A driver circuit having a high operating frequency among circuits is formed over an IC chip, and the IC chip is preferably mounted on the display panel 3301 by COG (Chip On Glass) or the like. Alternatively, the IC chip may be mounted on the display panel 3301 using TAB (Tape Auto Bonding) or a printed board. Note that FIG. 30A shows an example of a configuration in which some peripheral drive circuits are formed integrally with a pixel portion on a substrate and an IC chip on which other peripheral drive circuits are formed is mounted by COG or the like.

The display device described in the above embodiment can be applied as appropriate to the pixel portion.

For example, in order to reduce power consumption, a pixel portion is formed on a glass substrate using TFTs, all peripheral drive circuits are formed on an IC chip, and the IC chip is displayed by COG (Chip On Glass) or the like. It may be mounted on a panel.

  With this EL module, an EL television receiver can be completed. FIG. 34 is a block diagram showing the main configuration of an EL television receiver. A tuner 3401 receives video signals and audio signals. The video signal includes a video signal amplifying circuit 3402, a video signal processing circuit 3403 that converts a signal output from the video signal into a color signal corresponding to each color of red, green, and blue, and uses the video signal as input specifications of the drive circuit. It is processed by the control circuit 3412 for conversion. The control circuit 3412 outputs signals to the scanning line driver circuit 3410 side and the signal line driver circuit 3404 side, respectively. In the case of digital driving, a signal dividing circuit 3413 is provided between the control circuit 3412 and the signal line driving circuit 3404, and an input digital signal is divided into m and supplied to the signal line driving circuit 3404 for output to the display panel 3411. It is good also as composition to do.

  Of the signals received by the tuner 3401, the audio signal is sent to the audio signal amplifier circuit 3405, and the output is supplied to the speaker 3407 through the audio signal processing circuit 3406. The control circuit 3408 receives control information on the receiving station (reception frequency) and volume from the input unit 3409 and sends a signal to the tuner 3401 and the audio signal processing circuit 3406.

  FIG. 35A illustrates a television receiver in which an EL module of a different form from that in FIG. 34 is incorporated. In FIG. 35A, a display screen 3502 is formed of an EL module. The housing 3501 is appropriately provided with a speaker 3503, an operation switch 3504, and the like.

  FIG. 35B shows a television receiver that can carry only a display wirelessly. A housing and a signal receiver are incorporated in the housing 3512, and the display portion 3513 and the speaker portion 3517 are driven by the battery. The battery can be repeatedly charged by a charger 3510. The charger 3510 can transmit and receive a video signal, and can transmit the video signal to a signal receiver of the display. The housing 3512 is controlled by operation keys 3516. The device illustrated in FIG. 35B can also be referred to as a video / audio two-way communication device because a signal can be transmitted from the housing 3512 to the charger 3510 by operating the operation key 3516. In addition, by operating the operation key 3516, a signal is transmitted from the housing 3512 to the charger 3510, and further, a signal that can be transmitted by the charger 3510 is received by another electronic device, thereby controlling communication of the other electronic device. It can be said to be a general-purpose remote control device. The present invention can be applied to the display portion 3513.

  FIG. 36A shows a module in which a display panel 3601 and a printed wiring board 3602 are combined. The display panel 3601 includes a pixel portion 3603 provided with a plurality of pixels, a first scan line driver circuit 3604, a second scan line driver circuit 3605, and a signal line driver circuit that supplies a video signal to the selected pixel. 3606.

  The printed wiring board 3602 is provided with a controller 3607, a central processing unit 3608 (CPU), a memory 3609, a power supply circuit 3610, an audio processing circuit 3611, a transmission / reception circuit 3612, and the like. The printed wiring board 3602 and the display panel 3601 are connected by a flexible wiring board 3613 (FPC). The flexible wiring board 3613 may be provided with a storage capacitor, a buffer circuit, and the like so as to prevent noise from being applied to the power supply voltage and the signal and the rise of the signal from being slowed down. The controller 3607, the audio processing circuit 3611, the memory 3609, the CPU 3608, the power supply circuit 3610, and the like can be mounted on the display panel 3601 using a COG (Chip On Glass) method. The scale of the printed wiring board 3602 can be reduced by the COG method.

  Various control signals are input / output via an I / F unit 3614 (interface) provided in the printed wiring board 3602. An antenna port 3615 for transmitting and receiving signals to and from the antenna is provided on the printed wiring board 3602.

  FIG. 36B is a block diagram of the module shown in FIG. This module includes a VRAM 3616, a DRAM 3617, a flash memory 3618, and the like as the memory 3609. The VRAM 3616 stores image data to be displayed on the panel, the DRAM 3617 stores image data or audio data, and the flash memory 3618 stores various programs.

  The power supply circuit 3610 supplies power for operating the display panel 3601, the controller 3607, the CPU 3608, the sound processing circuit 3611, the memory 3609, and the transmission / reception circuit 3612. Depending on the panel specifications, the power supply circuit 3610 may be provided with a current source.

  The CPU 3608 includes a control signal generation circuit 3620, a decoder 3621, a register 3622, an arithmetic circuit 3623, a RAM 3624, an interface 3619 for the CPU 3608, and the like. Various signals input to the CPU 3608 through the interface 3619 are temporarily stored in the register 3622 and then input to the arithmetic circuit 3623, the decoder 3621, and the like. The arithmetic circuit 3623 performs an operation based on the input signal and designates a place to send various commands. On the other hand, the signal input to the decoder 3621 is decoded and input to the control signal generation circuit 3620. The control signal generation circuit 3620 generates a signal including various instructions based on the input signal, and a location specified in the arithmetic circuit 3623, specifically, a memory 3609, a transmission / reception circuit 3612, an audio processing circuit 3611, a controller 3607, and the like. Send to.

  The memory 3609, the transmission / reception circuit 3612, the sound processing circuit 3611, and the controller 3607 operate according to the received commands. The operation will be briefly described below.

  A signal input from the input unit 3625 is sent to the CPU 3608 mounted on the printed wiring board 3602 via the I / F unit 3614. The control signal generation circuit 3620 converts the image data stored in the VRAM 3616 into a predetermined format in accordance with a signal sent from an input unit 3625 such as a pointing device or a keyboard, and sends the image data to the controller 3607.

  The controller 3607 performs data processing on a signal including image data sent from the CPU 3608 in accordance with the panel specifications, and supplies the processed signal to the display panel 3601. Further, the controller 3607 generates an Hsync signal, a Vsync signal, a clock signal CLK, an AC voltage (AC Cont), and a switching signal L / R based on the power supply voltage input from the power supply circuit 3610 and various signals input from the CPU 3608. Generated and supplied to the display panel 3601.

  In the transmission / reception circuit 3612, signals transmitted / received as radio waves in the antenna 3628 are processed. Specifically, high-frequency signals such as an isolator, a band-pass filter, a VCO (Voltage Controlled Oscillator), an LPF (Low Pass Filter), a coupler, and a balun are used. Includes circuitry. A signal including audio information among signals transmitted and received in the transmission / reception circuit 3612 is sent to the audio processing circuit 3611 in accordance with a command from the CPU 3608.

  A signal including audio information transmitted in accordance with an instruction from the CPU 3608 is demodulated into an audio signal by the audio processing circuit 3611 and transmitted to the speaker 3627. An audio signal sent from the microphone 3626 is modulated by the audio processing circuit 3611 and sent to the transmission / reception circuit 3612 in accordance with a command from the CPU 3608.

  A controller 3607, a CPU 3608, a power supply circuit 3610, an audio processing circuit 3611, and a memory 3609 can be mounted as a package of this embodiment.

  Of course, the present invention is not limited to a television receiver, and is applied to various uses as a display medium of a particularly large area such as a monitor of a personal computer, an information display board in a railway station or airport, an advertisement display board in a street, etc. can do. By providing the display device of the present invention, vivid colors can be expressed.

  Note that this embodiment can be implemented freely combining with any description in the other embodiments and examples in this specification.

With respect to the present embodiment, an application mode is shown and described for an application example using a display panel in which the display device of the present invention is used as a display unit. A display panel using the display device of the present invention for a display portion can be configured to be provided integrally with a moving body, a building, or the like.

An example of a display panel having the display device of the present invention in a display portion is shown in FIG. 55 as an example of a display device-integrated moving body. FIG. 55A shows an example in which a display panel 9702 is used for a glass door glass of a train car main body 9701 as an example of a display device-integrated moving body. A display panel 9702 having the display device of the present invention shown in FIG. 55A as a display portion can easily switch an image displayed on the display portion by a signal from the outside. Therefore, it is possible to expect a more effective advertising effect by switching the image on the display panel every time when the customer base of the passengers on the train changes.

The display panel having the display device of the present invention in the display portion is not limited to being applicable only to the door glass in the train car body shown in FIG. It can be applied to any place. An example thereof will be described with reference to FIG.

FIG. 55 (b) illustrates the interior of the train car body. FIG. 55B shows a display panel 9703 provided on the glass window and a display panel 9704 suspended from the ceiling in addition to the glass door display panel 9702 of the door shown in FIG. The display panel 9703 having the display device of the present invention in a display portion includes a self-luminous display element. Therefore, the display panel 9703 displays an advertisement image when crowded, and does not display other than when crowded. You can also see the appearance. A display panel 9704 having the display device of the present invention in a display portion is provided with a switching element such as an organic transistor on a film-like substrate to bend the display panel itself, drive a self-luminous display element, and perform display. It is also possible to do this.

Another application mode of an application example of a display device-integrated moving body using a display panel having the display device of the present invention in a display portion will be described with reference to FIG.

An example of a display panel having the display device of the present invention in a display portion is shown in FIG. FIG. 56 shows an example of a display panel 9902 that is integrally attached to a car body 9901 as an example of a display unit-integrated moving body. The display panel 9902 having the display device of the present invention shown in FIG. 56 as a display unit is attached integrally with the body of the automobile, and displays the operation of the body and information input from inside and outside the body on demand, It also has a navigation function to other destinations.

Note that the display panel having the display device of the present invention in the display portion is not limited to being applicable only to the front portion of the vehicle body shown in FIG. It can be applied to any place such as a door.

Another application example of an application example of a display device-integrated moving body using a display panel having the display device of the present invention in a display portion will be described with reference to FIG.

An example of a display panel having the display device of the present invention in a display portion is shown in FIG. FIG. 57A shows an example of a display panel 10102 that is integrally attached to a passenger seat ceiling portion in an airplane body 10101 as an example of a display unit-integrated moving body. A display panel 10102 having the display device of the present invention shown in FIG. 57A as a display portion is integrally attached via an airplane body 10101 and a hinge portion 10103, and the passenger can display the display panel 10102 by expansion and contraction of the hinge portion 10103. Can be viewed. The display panel 10102 has a function of displaying information by being operated by a passenger or being used as an advertisement or an entertainment means. Also, as shown in FIG. 57 (b), safety at the time of takeoff and landing can be taken into consideration by bending the hinge portion 10103 and storing it in the airplane body 10101. Note that it can also be used as a guide light for the airplane body 10101 by turning on the display element of the display panel in an emergency.

Note that the display panel having the display device of the present invention in the display portion is not limited to being applicable only to the ceiling portion of the aircraft body 10101 shown in FIG. It can be applied to any place such as a door or a door. For example, a configuration may be employed in which a display panel is provided behind the seat in front of the seat for operation / viewing.

In this embodiment, the moving body is exemplified as a train car body, an automobile body, and an airplane body, but is not limited to this. A motorcycle, an automobile (including an automobile, a bus, etc.), a train (monorail, Including railways), ships, etc. By applying the display panel including the display device of the present invention, a moving body including a display medium that achieves reduction in size and power consumption of the display panel and favorable operation can be provided. In particular, it is easy to switch the display of a plurality of display panels in the moving body at the same time by an external signal, so an advertisement display panel for an unspecified number of customers, and an information display board for emergency disasters It can be said that it is extremely useful.

An application example using a display panel having the display device of the present invention in a display portion will be described with reference to FIG.

FIG. 58 shows a display panel having the display device of the present invention in a display portion, in which a switching element such as an organic transistor is provided on a film-like substrate, and the display panel itself is curved by driving a self-luminous display element. A possible display panel and its application will be described. FIG. 58 illustrates a structure in which a display panel is provided on a curved surface of a columnar body provided outdoors such as a utility pole as a building, and here, a structure in which the display panel 9802 is provided on a utility pole 9801 as a columnar body is illustrated.

The display panel 9802 shown in FIG. 58 is positioned at the middle of the height of the utility pole and is provided at a position higher than the human viewpoint. By visually recognizing the display panel from the moving body 9803, an image on the display panel 9802 can be recognized. The viewer can visually recognize the information display and the advertisement display by repeatedly foresting outdoors like a utility pole and displaying the same image on the display panel 9802 provided on the established utility pole. In FIG. 58, since the display panel 9802 provided on the utility pole 9801 can easily display the same image from an external signal, extremely efficient information display and advertising effect can be expected. In addition, since the display panel of the present invention is provided with a self-luminous display element as a display element, it can be said that the display panel is useful as a display medium with high visibility even at night.

In addition, as for an application example using a display panel having the display device of the present invention in a display portion, an application form of a building different from FIG. 58 will be described with reference to FIG.

FIG. 59 shows an application example of a display panel having the display device of the present invention in a display portion. FIG. 59 shows an example of a display panel 10002 integrally attached to a side wall in the unit bus 10001 as an example of a display device integrated type. A display panel 10002 having the display device of the present invention shown in FIG. 59 as a display portion is attached to a unit bath 10001 so that a bather can view the display panel 10002. The display panel 10002 has a function of displaying information by being operated by a bather or being used as an advertisement or an entertainment means.

Note that the display panel having the display device of the present invention in the display portion is not limited to be applicable only to the side wall of the unit bus 10001 shown in FIG. It can be applied to any place, such as a part or the tub itself.

FIG. 60 shows an example in which a television device having a large display portion is provided in a building. FIG. 60 includes a housing 8010, a display portion 8011, a remote control device 8012 which is an operation portion, a speaker portion 8013, and the like. A display panel including the display device of the present invention in the display portion is applied to manufacture of the display portion 8011. The television apparatus in FIG. 60 is integrated with a building as a wall-hanging type, and can be installed without requiring a large installation space.

In this embodiment, an electric pole, a unit bus, the inside of a building, and the like are taken as examples of the building. However, the present embodiment is not limited to this, and any building that can include a display panel may be used. By providing the display device of the present invention in a display panel, a building including a display medium capable of expressing colorful colors can be provided.

Note that this embodiment can be freely combined with any description in other embodiments and examples in this specification. In addition, any description in this embodiment can be freely combined and implemented.

The schematic diagram of the display apparatus of this invention. The schematic diagram of the picture element of the display apparatus of this invention. The circuit diagram of the pixel of the display apparatus of this invention. FIG. 6 is a circuit diagram of a pixel of a display device of the present invention. FIG. 6 is a timing chart of the display device of the present invention. Sectional drawing of the light emitting element of the display apparatus of this invention. Sectional drawing of the display apparatus of this invention. FIG. 7 is an emission spectrum diagram of the light-emitting element. FIG. 7 is an emission spectrum diagram of the light-emitting element. FIG. 7 is an emission spectrum diagram of the light-emitting element. The CIE-XY chromaticity diagram of the light emitting element of the present invention. Sectional drawing of the light emitting element of the display apparatus of this invention. FIG. 7 is an emission spectrum diagram of the light-emitting element. Sectional drawing of the display apparatus of this invention. Sectional drawing of the display apparatus of this invention. The schematic diagram of the picture element of the display apparatus of this invention. The schematic diagram of the picture element of the display apparatus of this invention. The schematic diagram of the picture element of the display apparatus of this invention. The schematic diagram of the picture element of the display apparatus of this invention. FIG. 6 is a circuit diagram of a pixel of a display device of the present invention. FIG. 6 is a timing chart of the display device of the present invention. FIG. 6 is a timing chart of the display device of the present invention. FIG. 6 is a circuit diagram of a pixel of a display device of the present invention. FIG. 6 is a circuit diagram of a pixel of a display device of the present invention. 6A and 6B illustrate operation of a transistor in a display device of the present invention. The circuit diagram of the pixel of the display apparatus of this invention. FIG. 6 is a top view of a pixel of a display device of the present invention. The circuit diagram of the pixel of the display apparatus of this invention. The circuit diagram of the pixel of the display apparatus of this invention. 1 is a diagram of a display device of the present invention. 1 is a diagram of a display device of the present invention. 1 is a diagram of a display device of the present invention. 4A and 4B each illustrate an electronic device to which a display device of the present invention can be applied. 4A and 4B each illustrate an electronic device to which a display device of the present invention can be applied. 4A and 4B each illustrate an electronic device to which a display device of the present invention can be applied. 4A and 4B each illustrate an electronic device to which a display device of the present invention can be applied. 4A and 4B each illustrate an electronic device to which a display device of the present invention can be applied. 4A and 4B each illustrate an electronic device to which a display device of the present invention can be applied. The CIE-XY chromaticity diagram for demonstrating a prior art example. Sectional drawing of the display apparatus of this invention. Sectional drawing of the display apparatus of this invention. Sectional drawing of the display apparatus of this invention. Sectional drawing of the display apparatus of this invention. FIG. 6 is a circuit diagram of a pixel of a display device of the present invention. Sectional drawing of the light emitting element of the display apparatus of this invention. The schematic diagram of the display apparatus of this invention. Sectional drawing of the display apparatus of this invention. Sectional drawing of the display apparatus of this invention. Sectional drawing of the display apparatus of this invention. The schematic diagram of the display apparatus of this invention. Sectional drawing of the display apparatus of this invention. FIG. 6 is a circuit diagram of a pixel of a display device of the present invention. The schematic diagram of the picture element of the display apparatus of this invention. Sectional drawing of the light emitting element of the display apparatus of this invention. FIG. 14 illustrates a method for using an electronic device of the invention. FIG. 14 illustrates a method for using an electronic device of the invention. FIG. 14 illustrates a method for using an electronic device of the invention. FIG. 14 illustrates a method for using an electronic device of the invention. FIG. 14 illustrates a method for using an electronic device of the invention. FIG. 14 illustrates a method for using an electronic device of the invention.

Explanation of symbols

R1 Light emitting element R2 Light emitting element R3 Light emitting element G1 Light emitting element G2 Light emitting element G3 Light emitting element B1 Light emitting element B2 Light emitting element B3 Light emitting element W Light emitting element W1 Light emitting element W2 Light emitting element 100 Pixel portion 101 Pixel 102 Signal line driver circuit 102a Shift register 102b 1st latch circuit 102c 2nd latch circuit 103 Scan line drive circuit 200 Picture element 201 1st pixel 202 2nd pixel 203 3rd pixel 204 4th pixel 205 5th pixel 206 6th pixel 301 First transistor 302 Second transistor 303 Light-emitting element 304 Retention capacitor 401 First transistor 402 Second transistor 403 Retention capacitor 404 Light-emitting element 405 Signal line 406 Power line 407 Scan line 501 Frame period 601 Substrate 602 Anode 603 Hole Injection layer 604 hole transport layer 05 light-emitting layer 606 electron transport layer 607 an electron injection layer 608 cathode 700 substrate 701 driving TFT
702 First electrode 703 Light emitting layer 704 Second electrode 801 Emission spectrum 802 Emission spectrum 901 Emission spectrum 902 Emission spectrum 1001 Emission spectrum 1002 Emission spectrum 1201A Hole injection layer 1201B Hole injection layer 1202A Hole transport layer 1202B Hole transport Layer 1203A Light emitting layer 1203B Light emitting layer 1204A Electron transport layer 1204B Electron transport layer 1205A Electron injection layer 1205B Electron injection layer 1201 Hole injection layer 1202 Hole transport layer 1203 Light emission layer 1204 Electron transport layer 1205 Electron injection layer 1206 Co-evaporation layer 1211 Substrate 1212 Transistor 1213 Anode 1214 Cathode 1301 Emission spectrum 1302 Emission spectrum 1400 Substrate 1401 Base insulating film 1402 Semiconductor layer 1403 Gate insulating film 1404 Gate Pole 1405 interlayer insulating film 1406 connecting portion 1407 first electrode 1408 partition wall 1409 light emitting layer 1410 a second electrode 1411 color filter (R1)
1412 Color filter (R2)
1413 Color filter (G1)
1414 Color filter (G2)
1415 Color filter (B1)
1416 Color filter (B2)
1417 counter substrate 1600 picture element 1601 first pixel 1602 second pixel 1603 third pixel 1604 fourth pixel 1605 fifth pixel 1606 sixth pixel 1700 picture element 1701 first pixel 1702 second pixel 1703 3rd pixel 1704 4th pixel 1705 5th pixel 1706 6th pixel 1710 Picture element 1800 Picture element 1801 1st pixel 1802 2nd pixel 1803 3rd pixel 1804 4th pixel 1805 5th pixel 1806 6th pixel 1807 7th pixel 1808 8th pixel 1809 9th pixel 1900 Picture element 1901 1st pixel 1902 2nd pixel 1903 3rd pixel 1904 4th pixel 1905 5th pixel 1906 5th Sixth pixel 1907 Seventh pixel 2001 First transistor 2002 Second transistor 2003 Second 3 transistor 2004 light emitting element 2005 holding capacitor 2006 signal line 2007 first scanning line 2008 second scanning line 2009 power supply line 2010 counter electrode 2101 frame period 2110 substrate 2113 first electrode 2114 partition wall 2115B light emitting layer 2115G light emitting layer 2115R light emitting Layer 2116 Second electrode 2121 Light emitting region 2122 Partition 2201 Frame period 2202 Period 2203 Period 2204 Period 2205 Period 2206 Period 2207 Period 2301 Erase diode 2302 Scanning line 2303 Data line 2304 Partition 2306 Input terminal 2307 Input terminal 2308 Connection wiring 2309a FPC
2309b FPC
2310 Substrate 2311 Sealing material 2401 Transistor 2601A Switching transistor 2601B Switching transistor 2602A Driving transistor 2602B Driving transistor 2604 Signal line 2605A Scanning line 2605B Scanning line 2606 Power supply line 2701A Holding capacitor 2701B Holding capacitor 3001 Signal line driver circuit 3002 Pixel unit 3003 Scanning line driver circuit 3004 Sealing substrate 3005 Sealing material 3006 Scan line driving circuit 3007 Space 3008 Wiring 3009 FPC
3010 Substrate 3011 TFT
3012 TFT
3013 First electrode 3014 Insulator 3016 Light emitting layer 3017 Second electrode 3018 Light emitting element 3019 IC chip 3020 N-channel TFT
3021 N-channel TFT
3100 Substrate 3101 Signal line driver circuit 3102 Pixel portion 3103 Scan line driver circuit 3104 Scan line driver circuit 3105 FPC
3106 IC chip 3107 IC chip 3108 Sealing substrate 3109 Sealing material 3110 Substrate 3111 Signal line driver circuit 3112 Pixel portion 3113 Scan line driver circuit 3114 Scan line driver circuit 3115 FPC
3116 IC chip 3117 IC chip 3118 Sealing substrate 3119 Sealing material 3200 Substrate 3201 Peripheral drive circuit 3202 Pixel portion 3204 FPC
3205 IC chip 3206 IC chip 3207 Sealing substrate 3208 Sealing material 3210 Substrate 3211 Peripheral drive circuit 3212 Pixel portion 3213 FPC
3214 FPC
3301 Display panel 3302 Pixel portion 3303 Scanning line driving circuit 3304 Signal line driving circuit 3311 Circuit board 3312 Control circuit 3313 Signal dividing circuit 3314 Connection wiring 3401 Tuner 3402 Video signal amplification circuit 3403 Video signal processing circuit 3404 Signal line driving circuit 3405 Audio signal amplification Circuit 3406 Audio signal processing circuit 3407 Speaker 3408 Control circuit 3409 Input unit 3410 Scan line drive circuit 3411 Display panel 3412 Control circuit 3413 Signal division circuit 3501 Case 3502 Display screen 3503 Speaker 3504 Operation switch 3510 Charger 3512 Case 3513 Display unit 3516 Operation key 3517 Speaker portion 3601 Display panel 3602 Printed wiring board 3603 Pixel portion 3604 Scan line driving circuit 360 5 Scanning Line Driver Circuit 3606 Signal Line Driver Circuit 3607 Controller 3608 CPU
3609 Memory 3610 Power supply circuit 3611 Audio processing circuit 3612 Transmission / reception circuit 3613 Flexible wiring board 3614 I / F unit 3615 Antenna port 3616 VRAM
3617 DRAM
3618 Flash memory 3619 Interface 3620 Control signal generation circuit 3621 Decoder 3622 Register 3623 Arithmetic circuit 3624 RAM
3625 Input means 3626 Microphone 3627 Speaker 3628 Antenna 3701 Display panel 3713 FPC
3730 Housing 3731 Printed circuit board 3732 Speaker 3733 Microphone 3734 Transmission / reception circuit 3735 Signal processing circuit 3736 Input means 3737 Battery 3939 Housing 3740 Antenna 3901 Dotted line 3902 Dotted line 3903 Dotted line 3904 Dotted line 3905 Triangle 4000 Substrate 4001 Base insulating film 4002 Semiconductor layer 4003 Gate insulating film 4004 Gate electrode 4005 Interlayer insulating film 4006 Connection portion 4007 First electrode 4008 Partition wall 4009A Light emitting layer 4009B Light emitting layer 4010 Second electrode 4011 Color conversion layer (R1)
4012 Color conversion layer (G1)
4013 Color conversion layer (R2)
4014 Color conversion layer (G2)
4015 Counter substrate 4109A Light emitting layer 4109B Light emitting layer 4401 First transistor 4402 Second transistor 4403 Signal line 4404 First power supply line 4405 Second power supply line 4406 Light emitting element 4407 Scan line 4601 Column signal line drive circuit 4602 Row signal line Drive circuit 4603 Pixel portion 4604 Light emitting element 5001 First substrate 5002 Column signal line 5003 Row signal line 5004 Partition wall 5005 Intersection 5006 Input terminal 5007 Input terminal 5008 Connection wiring 5009a FPC
5009b FPC
5010 Second substrate 5011 Sealing material 5101 Interlayer insulating film 5102 Wiring 5103 Reflective electrode 5104 Reflective electrode 6001 First transistor 6002 Second transistor 6003 Signal line 6004 First power supply line 6005 Second power supply line 6006 Light emitting element 6007 Scanning Line 6008 Current source circuit 6009 Third transistor 6010 Storage capacitor 7001 First transistor 7002 Second transistor 7003 Signal line 7004 First power supply line 7005 Second power supply line 7006 Light emitting element 7007 First scanning line 7009 Third Transistor 7010 storage capacitor 7016 second scanning line 7601 substrate 7602 base film 7603 pixel electrode 7604 first electrode 7605 wiring 7606 wiring 7607 N-type semiconductor layer 7608 N-type semiconductor layer 7609 semiconductor 7610 Gate insulating film 7611 Insulating film 7612 Gate electrode 7613 Second electrode 7614 Interlayer insulator 7615 Light emitting layer 7616 Counter electrode 7617 Light emitting element 7618 Drive transistor 7619 Storage capacitor 7620 First electrode 7701 Substrate 7702 Base film 7703 Gate electrode 7704 First Electrode 7705 gate insulating film 7706 semiconductor layer 7707 semiconductor layer 7708 N type semiconductor layer 7709 N type semiconductor layer 7710 N type semiconductor layer 7711 wiring 7712 wiring 7713 conductive layer 7714 pixel electrode 7715 insulator 7716 light emitting layer 7717 counter electrode 7718 light emitting element 7719 Drive transistor 7720 Storage capacitor 7721 Second electrode 7801 Insulator 7802 Insulator 8010 Housing 8011 Display portion 8012 Remote control device 8013 Speaker portion 9701 Train vehicle main body 9702 Display panel 9703 Display panel 9704 Display panel 9801 Telephone pole 9802 Display panel 9803 Moving body 9901 Car body 9902 Display panel 10001 Unit bus 10002 Display panel 10101 Aircraft car body 10102 Display panel 10103 Hinge portion 38101 Housing 38102 Support base 38103 Display portion 38201 Main unit 38202 Display unit 38203 Image receiving unit 38204 Operation key 38205 External connection port 38206 Shutter 38301 Main unit 38302 Housing 38303 Display unit 38304 Keyboard 38305 External connection port 38306 Pointing device 38401 Main unit 38402 Display unit 38403 Switch 38404 Operation key 38405 Infrared port 38501 Main unit 38502 Housing Body 38503 table Part A
38504 Display B
38505 section 38506 operation key 38507 speaker section 38601 main body 38602 display section 38603 earphone 38604 support section 38701 housing 38702 display section 38703 speaker section 38704 operation key 38705 storage medium insertion section 38801 main body 38802 display section 38803 operation key 38804 speaker 38805 shutter 38805 38807 Antenna

Claims (13)

A display area having a plurality of picture elements;
When the pixel is represented by a CIE-XY chromaticity diagram, the first pixel and the second pixel each include a light emitting element having a coordinate in a region where x of the CIE-XY chromaticity diagram is 0.50 or more. A pixel, a third pixel and a fourth pixel including light emitting elements having coordinates in a region where y in the CIE-XY chromaticity diagram is 0.55 or more, and x in the CIE-XY chromaticity diagram is 0. .5 or less, and a fifth pixel and a sixth pixel each having a light-emitting element having coordinates in a region where y is 0.25 or less,
The light emitting element provided in the first pixel and the light emitting element provided in the second pixel have different emission spectra,
The light emitting element provided in the third pixel and the light emitting element provided in the fourth pixel have different emission spectra.
The display device, wherein the light emitting element provided in the fifth pixel and the light emitting element provided in the sixth pixel have different emission spectra. A display area having a plurality of picture elements;
When the pixel is represented by a CIE-XY chromaticity diagram, the first pixel and the second pixel each include a light emitting element having a coordinate in a region where x of the CIE-XY chromaticity diagram is 0.50 or more. A pixel, a third pixel and a fourth pixel including light emitting elements having coordinates in a region where y in the CIE-XY chromaticity diagram is 0.55 or more, and x in the CIE-XY chromaticity diagram is 0. .5 or less, and a fifth pixel and a sixth pixel each having a light-emitting element having coordinates in a region where y is 0.25 or less,
The light emitting element provided in the first pixel and the light emitting element provided in the second pixel emit light in colors having different coordinates in the CIE-XY chromaticity diagram,
The light emitting element provided in the third pixel and the light emitting element provided in the fourth pixel emit light in colors having different coordinates in the CIE-XY chromaticity diagram,
The display device, wherein the light emitting element provided in the fifth pixel and the light emitting element provided in the sixth pixel emit light in colors having different coordinates in the CIE-XY chromaticity diagram. A display area having a plurality of picture elements;
When the pixel is represented by a CIE-XY chromaticity diagram, the first pixel and the second pixel each include a light emitting element having a coordinate in a region where x of the CIE-XY chromaticity diagram is 0.50 or more. A pixel, a third pixel and a fourth pixel including light emitting elements having coordinates in a region where y in the CIE-XY chromaticity diagram is 0.55 or more, and x in the CIE-XY chromaticity diagram is 0. .5 or less, and a fifth pixel and a sixth pixel each having a light-emitting element having coordinates in a region where y is 0.25 or less,
The light emitting element provided in the first pixel and the light emitting element provided in the second pixel are made of different materials and have different emission spectra.
The light emitting element provided in the third pixel and the light emitting element provided in the fourth pixel are made of different materials and have emission spectra different from each other.
The display device, wherein the light-emitting element provided in the fifth pixel and the light-emitting element provided in the sixth pixel are made of different materials and have different emission spectra. A display area having a plurality of picture elements;
When the pixel is represented by a CIE-XY chromaticity diagram, the first pixel and the second pixel each include a light emitting element having a coordinate in a region where x of the CIE-XY chromaticity diagram is 0.50 or more. A pixel, a third pixel and a fourth pixel including light emitting elements having coordinates in a region where y in the CIE-XY chromaticity diagram is 0.55 or more, and x in the CIE-XY chromaticity diagram is 0. .5 or less, and a fifth pixel and a sixth pixel each having a light-emitting element having coordinates in a region where y is 0.25 or less,
The light-emitting element provided in the first pixel and the light-emitting element provided in the second pixel have different film thicknesses from each other and have different emission spectra.
The light emitting element provided in the third pixel and the light emitting element provided in the fourth pixel are different in film thickness from each other and have different emission spectra,
The display device, wherein the light-emitting element provided in the fifth pixel and the light-emitting element provided in the sixth pixel have different thicknesses and have different emission spectra. A display area having a plurality of picture elements;
When the pixel is represented by a CIE-XY chromaticity diagram, the first pixel and the second pixel each include a light emitting element having a coordinate in a region where x of the CIE-XY chromaticity diagram is 0.50 or more. A pixel, a third pixel and a fourth pixel including light emitting elements having coordinates in a region where y in the CIE-XY chromaticity diagram is 0.55 or more, and x in the CIE-XY chromaticity diagram is 0. .5 or less, and a fifth pixel and a sixth pixel each having a light-emitting element having coordinates in a region where y is 0.25 or less,
The first pixel and the second pixel include color filters having different transmission characteristics, and transmit light having different emission spectra.
The third pixel and the fourth pixel include color filters having different transmission characteristics, and transmit light having different emission spectra. The fifth pixel and the sixth pixel have transmission characteristics. A display device comprising different color filters and transmitting light having different emission spectra. A display area having a plurality of picture elements;
When the pixel is represented by a CIE-XY chromaticity diagram, the first pixel and the second pixel each include a light emitting element having a coordinate in a region where x of the CIE-XY chromaticity diagram is 0.50 or more. A pixel, a third pixel and a fourth pixel including light emitting elements having coordinates in a region where y in the CIE-XY chromaticity diagram is 0.55 or more, and x in the CIE-XY chromaticity diagram is 0. .5 or less, and a fifth pixel and a sixth pixel each having a light-emitting element having coordinates in a region where y is 0.25 or less,
The light-emitting element provided in the first pixel and the light-emitting element provided in the second pixel are made of different materials and emit light in colors having different coordinates in the CIE-XY chromaticity diagram. And
The light emitting element provided in the third pixel and the light emitting element provided in the fourth pixel are made of different materials, and emit light in colors having different coordinates in the CIE-XY chromaticity diagram. And
The light-emitting element provided in the fifth pixel and the light-emitting element provided in the sixth pixel are made of different materials, and emit light in colors having different coordinates in the CIE-XY chromaticity diagram. A display device characterized by: A display area having a plurality of picture elements;
When the pixel is represented by a CIE-XY chromaticity diagram, the first pixel and the second pixel each include a light emitting element having a coordinate in a region where x of the CIE-XY chromaticity diagram is 0.50 or more. A pixel, a third pixel and a fourth pixel including light emitting elements having coordinates in a region where y in the CIE-XY chromaticity diagram is 0.55 or more, and x in the CIE-XY chromaticity diagram is 0. .5 or less, and a fifth pixel and a sixth pixel each having a light-emitting element having coordinates in a region where y is 0.25 or less,
The light-emitting element provided in the first pixel and the light-emitting element provided in the second pixel have different film thicknesses, and emit light in colors having different coordinates in the CIE-XY chromaticity diagram. And
The light emitting elements provided in the third pixel and the light emitting elements provided in the fourth pixel have different film thicknesses, and emit light with colors having different coordinates in the CIE-XY chromaticity diagram. And
The light emitting element provided in the fifth pixel and the light emitting element provided in the sixth pixel have different film thicknesses, and emit light with colors having different coordinates in the CIE-XY chromaticity diagram. A display device characterized by: A display area having a plurality of picture elements;
When the pixel is represented by a CIE-XY chromaticity diagram, the first pixel and the second pixel each include a light emitting element having a coordinate in a region where x of the CIE-XY chromaticity diagram is 0.50 or more. A pixel, a third pixel and a fourth pixel including light emitting elements having coordinates in a region where y in the CIE-XY chromaticity diagram is 0.55 or more, and x in the CIE-XY chromaticity diagram is 0. .5 or less, and a fifth pixel and a sixth pixel each having a light-emitting element having coordinates in a region where y is 0.25 or less,
The first pixel and the second pixel include color filters having different transmission characteristics, and light transmitted through the color filter is a color having different coordinates in the CIE-XY chromaticity diagram.
The third pixel and the fourth pixel include color filters having different transmission characteristics, and light transmitted through the color filter is a color having different coordinates in the CIE-XY chromaticity diagram.
The fifth pixel and the sixth pixel are provided with color filters having different transmission characteristics, and light transmitted through the color filter is a color having different coordinates in the CIE-XY chromaticity diagram. A display device. In any one of Claims 1 thru | or 8,
Either the light emitting element included in the first pixel or the light emitting element included in the second pixel has an x of 0 in the CIE-XY chromaticity diagram when represented by the CIE-XY chromaticity diagram. .6 or more and coordinates are in a region where y is 0.35 or less,
One of the light emitting element included in the third pixel and the light emitting element included in the fourth pixel is represented by x in the CIE-XY chromaticity diagram when represented by the CIE-XY chromaticity diagram. .3 or less, y has a coordinate in a region of 0.6 or more,
Any of the light emitting element included in the fifth pixel and the light emitting element included in the sixth pixel has an x of 0 in the CIE-XY chromaticity diagram when represented by the CIE-XY chromaticity diagram. A display device having coordinates in an area where .15 or less and y is 0.2 or less. In any one of Claims 1 thru | or 9,
The display device, wherein the picture element includes a light emitting element that emits white light. In any one of Claims 1 to 10,
The first pixel, the second pixel, the third pixel, and the fourth pixel, and the fifth pixel and the sixth pixel include light emitting regions having different areas. A display device. In any one of Claims 1 to 11,
The display device, wherein the light emitting element is an electroluminescence element. An electronic apparatus comprising the display device according to any one of claims 1 to 12.

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