JP2003108070A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the variance of luminance of light emission of optical elements in each pixel in a matrix type display device. SOLUTION: The equivalent circuit 100 equivalent to one pixel of a display device includes a plurality of optical elements, an OLED (organic light-emitting diode) 20 and an OLED30. These optical elements, the OLED20, the OLED30 are driven respectively by different transistors a Tr20 and a Tr40. When a pixel is made to really perform display, luminance data having practically equal values are supplied to these optical elements, the OLED20 and the OLED30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device,
In particular, the present invention relates to a technique for suppressing variations in emission brightness in a matrix display device.

[0002]

2. Description of the Related Art In recent years, an OLED functioning as a light emitting element
(Organic Light Emitting D
A display device using an iode) is attracting attention as a display device that replaces a CRT or LCD. For example, a thin film transistor (Thin Fi) is used as an element for driving an OLED.
Research and development of a display device including an lm Transistor (hereinafter, simply referred to as a TFT) has been actively pursued. OLED has passive type and active type,
In the active type OLED, a switching TFT is arranged in each pixel of the display so that the pixel can be turned on even when the brightness data is not written.

FIG. 11 shows an equivalent circuit of one pixel of an active type organic EL display. In an active matrix type organic EL display, a current flowing in an optical element which is an OLED is controlled by a driving element provided inside the pixel.

This circuit 10 includes optical elements OLED1 and T
FT transistor Tr1 and transistor Tr
2 and the capacitor C1. Here, the transistor Tr1 is for switching, and the transistor Tr2 is for driving to drive the optical element OLED1.

In the transistor Tr1, the gate electrode is connected to the scanning line 30, and the drain electrode is the data line 32.
The source electrode is connected to the gate electrode of the transistor Tr2 and one electrode 20 of the capacitor C1. The data line 32 is connected to a constant current source, and the optical element OL
Luminance data is sent that determines the current flowing through ED1.

In the transistor Tr2, the gate electrode is connected to the source electrode of the transistor Tr1, the source electrode is connected to the cathode 16 of the optical element OLED1,
The drain electrode is connected to the power supply line 34. A current for actually causing the optical element OLED1 to emit light is supplied to the power supply line 34. In the capacitor C1, one electrode 2
0 is the source electrode of the transistor Tr1 and the transistor T
It is connected to the gate electrode of r2, and the other electrode 22 is connected to the power supply line 34.

The optical element OLED1 includes a light emitting element layer 14 sandwiched between a cathode 16 and an anode 18. The cathode 16 of the optical element OLED1 is a transistor Tr2.
, And the anode 18 is grounded.

The operation of the equivalent circuit 10 having the above configuration will be described. First, when a data potential is applied to the data line 32 and the scanning line 30 is set to high, the transistor Tr1 becomes conductive. At this time, the potential of the electrode 20 of the capacitor C1 rises. At the same time, the potential of the gate electrode of the transistor Tr2 changes to the same potential as the potential of the electrode 20 of the capacitor 40.

When the potential of the gate electrode of the transistor Tr2 exceeds a predetermined value, a current corresponding to the voltage is supplied to the power supply line 3
4 from the optical element OLED1 to the optical element OLED1
Emits light. Even if the scanning line 30 is set low, the gate potential of the transistor Tr2 is held by the capacitor C1, so that the optical element OLED1 continues to emit light with a brightness according to the amount of current supplied to the transistor Tr2.

[0010]

However, conventionally, in the display device as described above, there is variation in the characteristics of the transistors provided in each pixel, particularly the driving transistor,
Therefore, the light emission luminance varies. Due to the variation in the light emission luminance of each pixel, the display on the matrix type display becomes non-uniform, which hinders the practical use of the organic EL display.

The present invention has been made in view of the above problems, and an object thereof is to provide a technique for suppressing unevenness in the light emission luminance of each pixel in a matrix type display and displaying uniformly.

[0012]

One aspect of the present invention relates to a display device. In this display device, one pixel is composed of a plurality of optical elements, each of the optical elements is provided with an individual drive circuit, and when the pixel is actually displayed, the drive capability of those drive circuits is substantially reduced. Set to a value equal to. Here, the “optical element” includes not only a “light emitting element” such as an organic EL but also an element such as a liquid crystal that controls the light emission amount by an optical path blocking effect. That is, this display device may be either an active type or a passive type. "Drivability" is the theoretical emission brightness of an optical element. That is, the brightness data may be given to the plurality of light emitting elements so that the light emitting elements always have the same light emission brightness.

The plurality of optical elements forming one pixel may have substantially the same area, and may be arranged substantially uniformly in the area occupied by the pixel. Each of the plurality of optical elements may have a substantially rectangular shape, and the optical elements may be juxtaposed so that their long sides face each other to form a pixel. The plurality of optical elements may each be approximately triangular,
Pixels may be formed by arranging optical elements side by side so that their hypotenuses face each other. When the plurality of light emitting elements have substantially equal areas, the same luminance data may be given to each of the plurality of light emitting elements.

The display device may be of a matrix type, and at least one of a data line and a scanning line for controlling a pixel may be divided and connected to each of a plurality of optical elements as an independent signal line. Here, the “division” is not limited to the case where the originally single signal line is physically divided into two and the logically same signal is supplied, but different signals may be supplied.

Another aspect of the present invention relates to a display device.
In this display device, one pixel is formed by one optical element, at least a scanning line of a data line and a scanning line for controlling the pixel is divided, and a plurality of driving circuits connected to the respective divided scanning lines. Is provided in the optical element, and each scanning line is independently controlled. The display device may select and control the divided scan lines at different timings.

Another aspect of the present invention relates to a display device.
In this display device, one pixel is configured by one optical element, and a plurality of independently controllable drive circuits are provided in the optical element, and when the pixel is actually displayed, the drive capability of those drive circuits is set. Are set to substantially equal values.

The display device may be of a matrix type, and at least the scanning lines of the data lines and the scanning lines for controlling the pixels are divided, and these are connected to the plurality of driving circuits as independent signal lines. Good.

It is to be noted that any combination of the above components, and conversion of the expressions of the present invention between the method and the apparatus are also effective as an aspect of the present invention.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION In the following embodiments, an active type organic EL display will be described as a display device. This display is a matrix type including a plurality of pixels. Each pixel includes an optical element that is an OLED that functions as a light emitting element inside.

Embodiment 1 In this embodiment, each pixel is composed of one optical element and a plurality of drive circuits capable of independently controlling the optical element. Specifically, the optical element is driven by two driving transistors that are respectively connected to two scanning lines that are independently controlled.

FIG. 1 shows an equivalent circuit 100 for one pixel of the display device according to the embodiment of the present invention. In this embodiment mode, a signal is supplied to each pixel from the first scan line 132 and the second scan line 136 which are connected to the first scan line driver circuit 130 and the second scan line driver circuit 134, respectively. The display device further includes a control unit 150 that controls the first scanning line driving circuit 130 and the second scanning line driving circuit 134. In the present embodiment, one optical element O
For the LED 10, two driving transistors and two switching transistors are prepared.

First, the structure of the equivalent circuit 100 will be described.
The equivalent circuit 100 includes a first transistor Tr10 that is a TFT, a second transistor Tr20, a third transistor Tr30 and a fourth transistor Tr40, a first capacitor C10, a second capacitor C20, and an optical element OLED10. The first transistor Tr10 and the third transistor Tr30 are for switching. The second transistor Tr20 and the fourth transistor Tr40 are for driving to control the driving current flowing in the optical element OLED10. The optical element OLED10 includes a light emitting element layer 114 sandwiched between a cathode 110 and an anode 112.

In the first transistor Tr10, the gate electrode is connected to the first scanning line 132, the drain electrode is connected to the data line 138, the source electrode is the gate electrode of the second transistor Tr20 and the first capacitor C10.
One of the electrodes 120 is connected. The data line 138 is connected to a constant current source and sends brightness data that determines the current flowing through the optical element OLED10. In the present embodiment, the optical element OLED10 includes the second transistor Tr.
Since a current is supplied from 20 and the fourth transistor Tr40 to theoretically double the current, the data line 138 is sent with luminance data that is half the current value required to drive the optical element OLED10. . The brightness data value may be appropriately set according to the mounted circuit.

In the second transistor Tr20, the gate electrode is connected to the source electrode of the first transistor Tr10 and one electrode 120 of the first capacitor C10,
The drain electrode is connected to the power supply line 140, and the source electrode is connected to the cathode 110 of the optical element OLED10.
The anode 18 of the optical element OLED10 is grounded. The other electrode 122 of the first capacitor C10 is connected to the power line 14
Connected to 0.

In the third transistor Tr30, the gate electrode is connected to the second scanning line 136, the drain electrode is connected to the data line 138, the source electrode is the gate electrode of the fourth transistor Tr40 and the second capacitor C20.
One of the electrodes 124 is connected. Fourth transistor T
At r40, the gate electrode is the third transistor Tr3.
0 is connected to the source electrode and one electrode 124 of the second capacitor C20, the drain electrode is connected to the power supply line 140, and the source electrode is connected to the optical element OLED10. The other electrode 126 of the second capacitor C20 is connected to the power supply line 140.

Next, the operation of the equivalent circuit 100 having the above configuration will be described. First, when the data potential is applied to the data line 138 and the first scanning line 132 connected to the first scanning line driving circuit 134 is set to high, the first transistor Tr10 becomes conductive. Thereby, the first capacitor C1
The electric charge is gradually stored in 0, and the first transistor Tr10
The electric potential of the electrode 120 connected to the source electrode of the device rises. At the same time, the potential of the gate electrode of the second transistor Tr20 rises as much as the potential of the electrode 120 of the first capacitor C10. That is, at this time, the second transistor Tr
The potential difference between the gate and source of 20 and the potential difference between both electrodes of the first capacitor C10 are equal.

At this time, the second transistor Tr20
When a predetermined constant potential is applied to the drain electrode of the power source line 140, a current corresponding to the gate-source potential difference of the second transistor Tr20 is supplied from the power source line 140 to the optical element OL.
It flows to ED10. As a result, the optical element OLED10 emits light.

In this state, if the first scanning line 132 is set low, the connection between the second transistor Tr20 and the data line 138 will be cut off.
The gate-source potential difference of r20 is the first capacitor C10.
The same amount of electric current continues to flow in the optical element OLED 10 since the optical element OLED is held by the optical element OLED.

Similarly, when the second scanning line 162 connected to the second scanning line driving circuit 134 is made high, the third transistor Tr30 becomes conductive. Accordingly, the electrode 1 connected to the third transistor Tr30 of the second capacitor C20
The potential of 24 rises. At the same time, the fourth transistor Tr
The potential of the gate electrode of 40 also rises by the same amount as the potential of the electrode 124 of the second capacitor C20. Therefore, at this time, the power supply line 1 is connected to the drain electrode of the fourth transistor Tr40.
When a predetermined constant potential is applied by 40, a current corresponding to the gate-source potential difference of the fourth transistor Tr40 flows from the power supply line 140 to the optical element OLED10. As a result, the optical element OLED10 emits light. In this state, even if the second scanning line 136 is set to low, the fourth transistor Tr
Since the gate-source potential difference of 40 is held by the second capacitor C20, the same amount of current continues to flow in the optical element OLED10.

The control unit 150 controls the first scanning line driving circuit 130 and the second scanning line driving circuit 134 so that the first scanning line 132 and the second scanning line 136 are alternately set to high. According to the present embodiment, the optical element OLED10
Since the currents from the two transistors, that is, the second transistor Tr20 and the fourth transistor Tr40, flow through the device, even if the characteristics of one of the transistors are deteriorated, they are averaged and the variation in brightness is suppressed. Therefore, variations in light emission of the optical element due to the performance of the transistor can be reduced, and the quality of the display device as a whole can be improved.

FIG. 2 is a schematic top view of a display device mounted with the circuit shown in FIG. The display device 160 is shown in FIG.
In addition to the configuration shown in FIG. 3, the data line driver circuit 162 connected to the data line 138 is provided. The control unit 150 also controls the data line driving circuit 162. The display device 160 is
The plurality of first scanning lines 132, the plurality of second scanning lines 136, the plurality of data lines 138, and the plurality of power supply lines 140 are included. Each of the first scan line 132 and the second scan line 136 is shared by pixels in the same row forming a matrix, and each of the data line 138 and the power supply line 140 is shared by pixels in the same column.

Second Embodiment In the present embodiment, each pixel is composed of two optical elements and a plurality of drive circuits individually connected to each of these optical elements. Specifically, each pixel includes two driving transistors respectively connected to two optical elements.

FIG. 3 shows an equivalent circuit 200 for one pixel of the display device according to the embodiment of the present invention. Hereinafter, the same configurations as those in FIG. The new configuration in FIG. 3 is that the equivalent circuit 200 has a first optical element OLED20 and a second optical element OLED30. In addition, the first optical element O of the equivalent circuit 200
The LED 20 and the second optical element OLED 30 also differ from the configuration of FIG. 1 in that they are driven by one scanning line 210.

In the equivalent circuit 200, the gate electrode of the first transistor Tr20 and the third transistor Tr20.
The gate electrode of 30 is connected to one scanning line 210. The source electrode of the second transistor Tr20 is connected to the cathode of the first optical element OLED20, and the source electrode of the fourth transistor Tr40 is connected to the cathode of the second optical element OLED30. First optical element OLED
20 and the anode 18 of the second optical element OLED30 are grounded.

Next, the operation of the equivalent circuit 200 having the above configuration will be described. First, when the data potential is applied to the data line 138 and the scanning line 210 is set to high, the first transistor Tr10 and the third transistor TR30 are made conductive. As a result, the second transistor Tr
Gate electrode 20 and electrode 12 of the first capacitor C10
0, the potentials of the gate electrode of the fourth transistor Tr40 and the electrode 124 of the second capacitor C20 rise. That is, at this time, the potential difference between the gate and source of the second transistor Tr20, the potential difference between both electrodes of the first capacitor C10, the potential difference between the gate and source of the fourth transistor Tr40, and the potential difference between both electrodes of the second capacitor C20 become equal.
Here, when a predetermined constant potential is applied by the power supply line 140, a current corresponding to the gate-source potential difference of the second transistor Tr20 is supplied from the power supply line 140 to the first optical element OLED.
Flows to 20. Similarly, a current according to the gate-source potential difference of the fourth transistor Tr40 flows from the power supply line 140 to the second optical element OLED30. As a result, the first optical element OLED20 and the second optical element OLED30 each emit light.

In this state, even if the scanning line 210 is set to be low, the gate-source potential difference of the second transistor Tr20 will be changed by the first capacitor C10.
Since the gate-source potential difference of 40 is respectively held by the second capacitor C20, the first optical element OLED2
The same amount of current continues to flow in the 0 and the second optical element OLED30.

According to the present embodiment, the first optical element OL
The same luminance data is supplied to the ED 20 and the second optical element OLED 30 from the data line 138, and light is emitted at the same timing. Therefore, even if the characteristics of the driving transistor that drives one of the optical elements are deteriorated, the emission luminance of the other optical element is compensated for, and the emission luminance of the pixel can be kept constant to some extent. Therefore, the quality of the entire display device can be improved even if there is some variation in the light emission of the optical element due to the performance of the transistor.

FIG. 4 is a schematic top view showing one pixel of the display device according to the present embodiment. Figure 4 (a)
[Fig. 4] is a schematic top view of the equivalent circuit 200 shown in Fig. 3. Here, each of the first optical element OLED20 and the second optical element OLED30 has a substantially rectangular shape. First optical element OLED20 and second optical element OLED30
Are arranged side by side so that the long sides of the substantially rectangular shape face each other to form one pixel. The first optical element OLED
The 20 and the second optical element OLED 30 may be arranged as shown in FIGS. 4B and 4C. What is shown above is an example, and the first optical element OLED20
And various arrangement | positioning of the 2nd optical element OLED30 can be considered. However, it is preferable from the standpoint of mounting and smoothing of emission brightness that the plurality of optical elements forming each pixel have substantially equal areas and are arranged substantially evenly in the region occupied by each pixel.

Third Embodiment In the present embodiment, each pixel is composed of two optical elements and a plurality of drive circuits which are individually connected to each of the optical elements and are capable of independently controlling each optical element. To be done. Specifically, each pixel includes two driving transistors connected to two optical elements, and each driving transistor is connected to two scanning lines which are independently controlled.

FIG. 5 shows an equivalent circuit 300 for one pixel of the display device according to the embodiment of the present invention. Hereinafter, the same configurations as those in FIG. The new configuration in FIG. 5 is that the equivalent circuit 300 includes the first optical element OLED20 and the second optical element OLED30, like the equivalent circuit 200 in FIG.

The source electrode of the second transistor Tr20 is connected to the first optical element OLED20 and the source electrode of the second transistor Tr20 is connected to the fourth transistor Tr4.
The source electrodes of 0 are respectively connected to the second optical element OLED30.

Next, the operation of the equivalent circuit 300 having the above configuration will be described. A first potential connected to the first scan line driver circuit 134 while applying a data potential to the data line 138
When the scan line 132 is set to high, the first transistor Tr1
0 conducts. At this time, if a predetermined constant potential is applied to the drain electrode of the second transistor Tr20 by the power supply line 140, a current corresponding to the gate-source potential difference of the second transistor Tr20 is supplied from the power supply line 140 to the first optical element O.
It flows to the LED 20. In this state, even if the first scanning line 132 is set low, the gate-source potential difference of the second transistor Tr20 is held by the first capacitor C10, so that the same amount of current continues to flow in the first optical element OLED20.

Next, when the second scanning line 162 connected to the second scanning line driving circuit 134 is made high, the third transistor Tr30 becomes conductive. At this time, if a predetermined constant potential is applied by the power supply line 140, the fourth transistor Tr40
A current corresponding to the gate-source potential difference of the current flows from the power supply line 140 to the second optical element OLED30. In this state, even if the second scanning line 136 is set to low, the fourth transistor Tr
Since the gate-source potential difference of 40 is held by the second capacitor C20, the same amount of current continues to flow in the second optical element OLED30. The controller 150 controls the first scanning line driving circuit 130 and the second scanning line driving circuit 134 so that the first scanning line 132 and the second scanning line 136 are alternately set to high.

According to the present embodiment, the first optical element OL
The same luminance data is supplied from the data line 138 to the ED 20 and the second optical element OLED 30, and they are sequentially driven. Therefore, it has the same effect as the second embodiment, and the quality of the entire display device can be improved even if there is some variation in the light emission of the optical element due to the performance of the transistor.

FIG. 6 is a schematic top view showing one pixel of the display device according to the present embodiment. Figure 6 (a)
[Fig. 6] is a schematic top view of the equivalent circuit 300 shown in Fig. 5. Here, each of the first optical element OLED20 and the second optical element OLED30 has a substantially rectangular shape. First optical element OLED20 and second optical element OLED30
Are arranged side by side so that the long sides of the substantially rectangular shape face each other to form one pixel. The first optical element OLED
20 and the second optical element OLED30 may be arranged as shown in FIGS. 6B and 6C. What is shown above is an example, and the first optical element OLED20
And various arrangement | positioning of the 2nd optical element OLED30 can be considered.

Fourth Embodiment In the present embodiment, each pixel is composed of two optical elements and a plurality of drive circuits which are individually connected to each of the optical elements and are capable of independently controlling each optical element. To be done. Specifically, each pixel includes two driving transistors connected to two optical elements, and each driving transistor is supplied with brightness data from two independently controlled data lines. It

FIG. 7 shows an equivalent circuit 400 for one pixel of the display device according to the embodiment of the present invention. Hereinafter, the same components as those in FIGS. 1 and 3 are designated by the same reference numerals, and the description thereof will be appropriately omitted. The equivalent circuit 400 includes the first optical element OLED20 and the second optical element OL as in the equivalent circuit 200 of FIG.
Having ED30. In the new configuration in FIG. 7, each pixel has a first data line 41 connected to a first data line drive circuit 410 and a second data line drive circuit 414.
2 and the signal is supplied from the second data line 416.

The source electrode of the first transistor Tr10 is connected to the first data line 412, and the source electrode of the third transistor Tr30 is connected to the second data line 416.
The operation of the equivalent circuit 400 is the same as that of the equivalent circuit 300 shown in FIG. However, the source electrode of the first transistor Tr10 and the third transistor Tr30 are supplied with the luminance data from different data lines. The controller 150 controls the first data line 412 and the second data line 416 so that the luminance data having the same logical value is supplied.

According to the present embodiment, the first optical element OL
The ED 20 and the second optical element OLED 30 are supplied with the luminance data of the same logical value and driven at the same timing. Therefore, it has the same effect as the second embodiment, and the quality of the entire display device can be improved even if there is some variation in the light emission of the optical element due to the performance of the transistor.

FIG. 8 is a schematic top view showing one pixel of the display device according to the present embodiment. Figure 8 (a)
[Fig. 8] is a schematic top view of the equivalent circuit 400 shown in Fig. 7. Here, each of the first optical element OLED20 and the second optical element OLED30 has a substantially rectangular shape. First optical element OLED20 and second optical element OLED30
Are arranged side by side so that the long sides of the substantially rectangular shape face each other to form one pixel. The first optical element OLED
20 and the second optical element OLED30 may be arranged as shown in FIG. What is shown above is an example, and what is shown above is an example, and various arrangements of the first optical element OLED20 and the second optical element OLED30 can be considered.

Fifth Embodiment In this embodiment, each pixel is composed of two optical elements and a plurality of drive circuits which are individually connected to each of the optical elements and are capable of independently controlling each optical element. To be done. Specifically, each pixel includes two driving transistors that are respectively connected to two optical elements, and each driving transistor is connected to two scan lines that are independently controlled,
Luminance data from the two data lines are supplied respectively.

FIG. 9 shows an equivalent circuit 500 for one pixel of the display device according to the embodiment of the present invention. Hereinafter, the same configurations as those in FIGS. 1, 3 and 7 are designated by the same reference numerals, and the description thereof will be appropriately omitted. The equivalent circuit 500 is the equivalent circuit 20 of FIG.
Like 0, it has a first optical element OLED 20 and a second optical element OLED 30. Further, similarly to the equivalent circuit of FIG. 1, each pixel has a first scanning line driving circuit 130 and a second scanning line driving circuit 130.
A signal is supplied from the first scanning line 132 and the second scanning line 136 which are respectively connected to the scanning line driving circuit 134.
Further, similar to the equivalent circuit of FIG. 7, each pixel has a first data line driving circuit 410 and a second data line driving circuit 41.
First data line 412 and second data line 412 respectively connected to
A signal is supplied from the data line 416.

Next, the operation of the equivalent circuit 400 is the same as that of the equivalent circuit shown in FIGS. The control unit 150
The first data line 412 and the second data line 416 are controlled so that the luminance data having the same logical value is supplied.

According to the present embodiment, the same effects as those of the second to fourth embodiments are obtained, and the quality of the entire display device is improved even if there is some variation in the light emission of the optical element due to the performance of the transistor. be able to.

FIG. 10 is a schematic top view showing one pixel of the display device according to the present embodiment. Figure 10
FIG. 9A is a schematic top view of the equivalent circuit 500 shown in FIG. 9. Here, each of the first optical element OLED20 and the second optical element OLED30 has a substantially rectangular shape.
First optical element OLED20 and second optical element OLED
The pixels 30 are arranged side by side so that the long sides of the generally rectangular shape face each other to form one pixel. The first optical element OL
The ED 20 and the second optical element OLED 30 are shown in FIG.
They may be arranged as shown in (b). In addition, FIG.
As shown in (c), the first optical element OLED20 and the second optical element OLED30 may each have a substantially triangular shape. In this case, the first optical element OLED20 and the second optical element OLED30 may be arranged side by side so that the hypotenuses of the substantially triangular shape face each other to form one pixel. What is shown above is an example, and what is shown above is an example, and various arrangements of the first optical element OLED20 and the second optical element OLED30 can be considered.

The present invention has been described above based on the embodiments. It is understood by those skilled in the art that these embodiments are mere examples, and that various modifications can be made to the combinations of the respective constituent elements and the respective processing processes, and such modifications are also within the scope of the present invention. By the way. Hereinafter, such an example will be described.

In the embodiment, the switching transistor and the driving transistor are shown as n-channel type, but these transistors may be p-channel type, or a combination of n-channel type and p-channel type. May be. The circuit configuration in this case is set as appropriate.

In the first, third and fifth embodiments, the first
Although the scanning line driving circuit and the second scanning line driving circuit are used, instead of physically dividing the circuit in this way, a plurality of scanning lines are connected to one circuit and the scanning lines are sequentially arranged for each row. Alternatively, the brightness data may be written to a plurality of scanning lines included in one pixel.

[0059]

By suppressing the variation of the light emission luminance in each pixel, the quality of the entire display device can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an equivalent circuit of one pixel of a display device according to an embodiment of the present invention.

2 is a schematic top view of a display device mounted with the circuit shown in FIG. 1. FIG.

FIG. 3 is a diagram showing an equivalent circuit of one pixel of the display device according to the embodiment of the present invention.

FIG. 4 is a schematic top view showing one pixel of the display device according to the present embodiment.

FIG. 5 is a diagram showing an equivalent circuit of one pixel of the display device according to the exemplary embodiment of the present invention.

FIG. 6 is a schematic top view showing one pixel of the display device according to the present embodiment.

FIG. 7 is a diagram showing an equivalent circuit of one pixel of the display device according to the exemplary embodiment of the present invention.

FIG. 8 is a schematic top view showing one pixel of the display device according to the present embodiment.

FIG. 9 is a diagram showing an equivalent circuit of one pixel of the display device according to the exemplary embodiment of the present invention.

FIG. 10 is a schematic top view showing one pixel of the display device according to the present embodiment.

FIG. 11 is a diagram showing an equivalent circuit of one pixel of a conventional active type organic EL display.

[Explanation of symbols]

100 ... Equivalent circuit, 110 ... Cathode, 112 ...
Anode, 114 ... Light-emitting element layer, 120 ... Electrode, 1
22 ... Electrode, 130 ... First scanning line drive circuit, 132
..First scanning line, 134. Second scanning line drive circuit, 13
6 ... Second scanning line, 138 ... Data line, 140 ... Power supply line, 200 ... Equivalent circuit, 210 ... Scanning line, 300
..Equivalent circuit, 400..Equivalent circuit, 410..First data line driving circuit, 412..First data line, 414 ..
Second data line drive circuit, 416..Second data line, 50
0 ... Equivalent circuit, Tr10 ... First transistor, Tr
20 ... Second transistor, Tr30 ... Third transistor, Tr40 ... Fourth transistor, C10 ... First
Capacitor, C20 ... Second capacitor, OLED10
..Optical element, OLED20..First optical element, OLE
D30 ... Second optical element.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09G 3/36 G09G 3/36 H05B 33/08 H05B 33/08 33/14 33/14 A F term (reference) ) 3K007 AB02 EB00 GA04 5C006 AC11 AF42 AF43 BB13 BB16 BC22 FA22 5C080 AA06 BB05 DD05 EE28 FF11 JJ02 JJ03 5C094 AA03 BA03 BA29 CA19 CA20 DB01 DB04 EA04 EA07

Claims (7)

[Claims] 1. A pixel is composed of a plurality of optical elements, and each of these optical elements is provided with an individual drive circuit, and when the pixel is actually displayed, the drive capability of these drive circuits is substantially reduced. A display device characterized by being set to a value equal to. 2. The display according to claim 1, wherein the plurality of optical elements forming the one pixel have substantially equal areas, and are arranged substantially evenly in a region occupied by the pixel. apparatus. 3. The plurality of optical elements are each substantially rectangular, and the pixels are formed by arranging the optical elements side by side so that their long sides face each other.
Display device according to. 4. The plurality of optical elements are each substantially triangular, and the pixels are formed by arranging the optical elements side by side so that their hypotenuses face each other.
Display device according to. 5. The display device is of a matrix type, and at least one of a data line and a scanning line for controlling the pixel is divided and connected to each of the plurality of optical elements as an independent signal line. The display device according to any one of claims 1 to 4. 6. One pixel is formed by one optical element, and at least a scanning line of a data line and a scanning line for controlling the pixel is divided, and a plurality of drives connected to the respective divided scanning lines. A display device characterized in that a circuit is provided in the optical element and each scanning line is independently controlled. 7. The display device according to claim 6, wherein the divided scanning lines are selected and controlled at different timings.