JP2009071176A - Display apparatus and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display apparatus having a pixel array in which display pixels of the same color are not continuously arranged in one direction, such as in a case where a plurality of display pixels is in a delta array or the like, and which is capable of separating by color using a nozzle printing system, and to provide a method of manufacturing the same. <P>SOLUTION: A display apparatus 1 has a plurality of 3-color display pixels, each of which has a light-emitting element, is arranged in a delta shape. The display apparatus 1 has a plurality of separating walls 3 formed so as to separate pixel electrodes of the display pixels, and an organic compound layer formed on the pixel electrodes in a groove formed by the separating walls 3 by applying organic compound containing fluid in the groove with making a nozzle meet the groove. The separating walls 3 are formed so as to provide each pixel electrode of the display pixel of the same color arranged every two columns in a row direction in the groove formed by a pair of separating walls 3 and to extend in the row direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device and a method for manufacturing the display device.

  In a display device including a plurality of display pixels each having a light emitting element, for example, an organic EL (Electro Luminescence) element, a wet printing method such as an inkjet method or a nozzle printing method is used for a film forming process of an organic layer of the organic EL element. ing.

For example, in Patent Document 1, a groove corresponding to a predetermined pattern shape to be applied is formed on a substrate, and the substrate and the nozzle are relatively moved so that the nozzle is along the groove. A nozzle printing method has been proposed in which an organic EL material is applied in a groove. According to this nozzle printing method, rebound from the substrate can be prevented, and furthermore, it is not necessary to control the ejection position of the organic EL material and the on / off timing of the ejection with high precision, thereby facilitating coating control. be able to.
JP 2002-75640 A

  By the way, a full color display usually has display pixels of three colors of red (R), green (G), and blue (B), and the pixel arrangement of the display pixels of each color is a stripe arrangement, a delta arrangement, a mosaic arrangement, etc. There is. In general, a pixel arrangement in which display pixels of the same color such as a delta arrangement are not continuously arranged in one direction is suitable for displaying moving images, photographs, etc., and a stripe arrangement is suitable for displaying characters, tables, etc. It is known.

  However, since the organic EL material used for each color display pixel is different, it has to be applied separately according to the pixel arrangement. However, in the nozzle printing method of Patent Document 1, the organic EL material is continuously poured into the groove. The pixel arrangement that can be applied separately is limited to the stripe arrangement and the mosaic arrangement, and the pixel arrangement in which display pixels of the same color such as a delta arrangement are not continuously arranged in one direction is applied. Could not respond. Further, it is preferable that all the pixel arrays can be separately applied using the same manufacturing process, and the delta array and the like are also required to be separately applied using the nozzle printing method.

  The present invention has been made in view of the above circumstances, and a nozzle print is provided for a display device having a pixel array in which display pixels of a plurality of colors are not continuously arranged in one direction, such as a delta array. It is an object of the present invention to provide a display device and a method for manufacturing the display device that can be separately applied using a method.

In order to achieve the above object, a display device according to the first aspect of the present invention provides:
A display device in which a plurality of color display pixels having light emitting elements are arranged in a row and column direction,
The display pixels of the plurality of colors are arranged such that the display pixels of any one color are shifted in the column direction by 1.5 pixel pitch for each column, and the display pixels of the same color are arranged every other column in the row direction,
Each display pixel has a pixel electrode that forms a light emitting portion of the light emitting element,
A plurality of partition walls formed so as to partition the pixel electrodes of the display pixels for each row;
A plurality of grooves extending in the row direction are formed by the pair of the partition walls in the plurality of partition walls,
The pixel electrodes of the display pixels of the same color arranged in every other column in the row direction are provided inside the grooves.

  Each groove is formed to have a constant width in the row direction, for example, and each partition wall has a constant width in the row direction, for example.

Each of the grooves is formed, for example, such that the width in the row direction in the region corresponding to the pixel electrode of the display pixels of the same color arranged in every other column is wider than the width in the row direction in other regions. And
Each of the partition walls is, for example, a region corresponding to the pixel electrode of the display pixel of the same color arranged every other column, and the width in the row direction is larger than the width in the row direction in other regions. It has a narrowed deformation.

  The display pixel includes, for example, a pixel circuit having at least one active element that drives the light emitting element. In this case, it is preferable that the active element in the pixel circuit is formed below a region of the partition where the deformed portion is not formed.

  For example, an organic compound-containing liquid continuously discharged from a nozzle having a discharge portion is applied onto the pixel electrodes of the display pixels of the same color arranged in every other row in each groove, and the light emitting element An organic compound layer constituting the light emitting layer is formed, and the width of each groove in the row direction is at least larger than the outer shape of the discharge portion of the nozzle.

For example, a liquid repellent treatment is performed on the surface of the partition wall.
The light emitting element is, for example, an organic electroluminescence element.

A manufacturing method of a display device according to the second aspect of the present invention is as follows.
A method of manufacturing a display device in which a plurality of color display pixels having light emitting elements are arranged in a row and column direction,
The pixel electrodes of the display pixels of the plurality of colors are arranged so that the display pixels of any one color are shifted in the column direction by 1.5 pixel pitch for each column, and the display pixels of the same color are arranged every other column in the row direction. Forming to be arranged; and
Forming a plurality of partition walls extending in a row direction so as to partition the pixel electrodes of the display pixels for each row;
The organic compound-containing liquid is applied along a plurality of grooves formed by a pair of the partition walls in the plurality of partition walls, thereby forming a light emitting layer of the light emitting element on the pixel electrode in each groove. And a step of forming an organic compound layer.

  In the step of forming the plurality of partition walls, for example, the plurality of partition walls are arranged in every other column in the row direction in the grooves of the plurality of grooves formed by the pair of partition walls in the plurality of partition walls. The pixel electrodes of the display pixels of the same color are formed so as to be provided.

  In the step of forming the plurality of partition walls, for example, the partition walls are formed to have a constant width in the row direction, and the widths of the grooves in the row direction are made constant.

  In the step of forming the plurality of partition walls, for example, the width in the row direction is set in the region corresponding to the pixel electrode of the display pixel of the same color arranged in every other column in each partition wall, and the rows in the other regions. Forming a deformed portion narrower than the width in the direction, and the width in the row direction in the region corresponding to the pixel electrode of the display pixel of the same color arranged in every other column of each groove is a row in the other region Be wider than the width of the direction.

  The display pixel includes, for example, a pixel circuit having at least one active element that drives the light emitting element. In this case, it is preferable that the method further includes a step of forming the active element of the pixel circuit below a region of the partition where the deformed portion is not formed.

It is preferable to further include a step of applying a liquid repellent treatment to the surface of the partition wall.
An organic electroluminescence element is preferably used for the light emitting element.

  According to the present invention, for a display device having a pixel array in which display pixels of the same color, such as a delta array, are not continuously arranged in one direction, the color printing is performed using the nozzle printing method. Can do.

  Hereinafter, a display device and a method for manufacturing the display device of the present invention will be described with reference to the drawings. In the present embodiment, the present invention will be described by taking a display device including a plurality of display pixels each having a light emitting element formed of an organic EL (Electro Luminescence) element as an example.

  FIG. 1 is a diagram illustrating an example of a pixel array of the display device 1 in the present embodiment. In FIG. 1, only the pixels and the partition walls are shown in order to clearly show the relationship between the pixel arrangement and the partition walls.

  As shown in FIG. 1, the display device 1 includes an organic EL panel (OLED: Organic Light Emitting Diode) 2 and a plurality of partition walls 3.

  The organic EL panel 2 is a display panel in which display pixels having organic EL elements are two-dimensionally arranged on a substrate. In the organic EL panel 2 of the present embodiment, as shown in FIG. 1, a plurality of arrangements (delta arrangement) such that display pixels of three colors of red (R), green (G), and blue (B) are in a delta shape. )

  A plurality of partition walls 3 are arranged side by side on the substrate so as to form a stripe shape (straight line shape). In the present embodiment, the partition walls 3 extend in the row direction (left-right direction in FIG. 1) and are arranged in parallel in the column direction (up-down direction in FIG. 1). For this reason, the grooves formed by the partition walls 3 are also formed in stripes.

  The partition 3 is formed so as to divide a plurality of display pixels (pixel electrodes) of the organic EL panel 2 for each color. Therefore, only one color pixel electrode is provided in the groove formed by the partition 3. As described above, since only one color pixel electrode is provided in the groove, the nozzle printing method is used in the formation of the organic EL layer 15 (hole injection layer 15a, light emitting layer 15b) of the organic EL element described later. The organic EL material to be applied can be applied separately.

  When the display pixels of the display device 1 are driven by an active driving method, an anode line (Anode line) connected to an organic EL element of each display pixel, a data line (Data line), and , A select line is formed. The anode line is formed to extend in the row direction. The data line is formed so as to extend in the column direction, and the select line is formed so as to be orthogonal to this and extend in the row direction. The display pixels of the display device 1 may be passively driven. In that case, an anode line connected to the organic EL element of each display pixel and a cathode line (Cathode line) are formed on the substrate. For example, the anode line is formed to extend in the row direction, and the cathode line is formed. It is formed to extend in the column direction. In the present embodiment, it is assumed that the display pixel is an active drive method.

  FIG. 2 is a diagram illustrating an example of a circuit configuration of an active drive type display pixel of the display device 1. As shown in FIG. 2, each display pixel includes a pixel driving circuit Dc having an active element such as a TFT (Thin Film Transistor), and an organic EL element OLED (Organic Light Emitting) that emits light by a current controlled by the pixel driving circuit Dc. The circuit configuration includes a diode.

  As shown in FIG. 2, the pixel drive circuit Dc includes a transistor (selection transistor) Tr11, a transistor (light emission drive transistor) Tr12, and a capacitor Cs, and is connected to the anode terminal of the organic EL element OLED.

  As shown in FIG. 2, the selection transistor Tr11 has a gate terminal connected to the select line Ls, a source terminal connected to the data line Ld arranged in the column direction of the display panel, and a drain terminal connected to the contact N11. The gate terminal of the light emission drive transistor Tr12 is connected to the contact N11, the source terminal is connected to the supply voltage line La, and the drain terminal is connected to the contact N12. The capacitor Cs is connected to the gate terminal and the drain terminal of the transistor Tr12. The capacitor Cs is an auxiliary capacitance additionally provided between the gate and drain of the transistor Tr12, or a capacitance component composed of these parasitic capacitance and auxiliary capacitance. The organic EL element has an anode terminal (anode electrode) connected to the contact N12 and a cathode terminal (cathode electrode) connected to a reference voltage Vss (for example, ground potential GND).

  Each of the transistors Tr11 and Tr12 is an n-channel thin film transistor (field effect transistor). Note that a p-channel field effect transistor may be used, and in this case, the source terminal and the drain terminal are connected in the opposite manner to FIG.

  The select line Ls is connected to a select driver (not shown), and a selection voltage (select signal) Ssel for setting a plurality of display pixels arranged in the row direction of the display panel to a selected state at a predetermined timing is applied. . The data line Ld is connected to a data driver (not shown), and a data voltage (gradation signal) Vpix corresponding to the display data is applied at a timing synchronized with the selection state of each display pixel.

  In addition, the anode line (supply voltage line) La is connected directly or indirectly to a predetermined high potential power source, for example, and applies a light emission driving current corresponding to display data to a pixel electrode (for example, an anode electrode) of the organic EL element. Shed. Therefore, a predetermined high potential (supply voltage Vdd) having a potential higher than the reference voltage Vss applied to the counter electrode (cathode electrode) of the organic EL element is applied to the anode line La.

  That is, in each display pixel, the supply voltage Vdd and the reference voltage Vss are applied to both ends (the drain terminal of the transistor Tr12 and the cathode terminal of the organic EL element) of the pair of the transistor Tr12 and the organic EL element connected in series. A forward bias is applied to the organic EL element so that the organic EL element can emit light, and the current value of the light emission drive current that flows according to the gradation signal Vpix is controlled by the pixel drive circuit.

  Next, an example of the structure of the display pixel of the display device 1 will be described. FIG. 3 shows a plan view of the display pixel. 4 is a cross-sectional view taken along line IV-IV in FIG. The display device 1 of the present embodiment is a so-called bottom emission type in which light is extracted from the substrate side.

  The board | substrate 11 is formed from the material provided with translucency, for example, is comprised from the glass substrate. On the substrate 11, a gate electrode Tr12g, a data line Ld, and an insulating film 12 are formed.

  The insulating film 12 is made of an insulating material such as a silicon oxide film or a silicon nitride film. The insulating film 12 is formed on the substrate 11 so as to cover the gate electrode Tr12g and the data line Ld. The insulating film 12 functions as a gate insulating film of the transistor Tr12 in the region where the gate electrode Tr12g is formed.

  The transistors Tr11 and Tr12 are n-channel thin film transistors (TFTs). The transistors Tr11 and Tr12 are formed on the substrate 11. The transistor Tr12 includes a semiconductor layer SMC, a source electrode Tr12s, a drain electrode Tr12d, an ohmic contact layer OHM, and a gate electrode Tr12g. Note that, similarly to the transistor Tr12, the transistor Tr11 includes a semiconductor layer, a source electrode Tr11s, a drain electrode Tr11d, an ohmic contact layer, and a gate electrode Tr11g.

  In the transistors Tr11 and Tr12, the gate electrodes Tr11g and Tr12g are made of, for example, aluminum-neodymium-titanium (AlNdTi) or chromium (Cr). The source electrodes Tr11s and Tr12s and the drain electrodes Tr11d and Tr12d are respectively provided. For example, it is made of aluminum-titanium (AlTi) / Cr, AlNdTi / Cr, or Cr. Further, ohmic contact layers OHM are formed between the source electrodes Tr11s and Tr12s, the drain electrodes Tr11d and Tr12d, and the semiconductor layer SMC for low resistance contact.

  Further, a source region and a drain region (not shown) are formed in the semiconductor layer SMC, and when a predetermined voltage is applied to the gate electrodes Tr11g and Tr12g, a channel is formed in a region facing the gate electrodes Tr11g and Tr12g. The

  An interlayer insulating film 13 (13a, 13b) is formed on the transistor Tr12 and the anode line La. The interlayer insulating film 13 is formed of an insulating material such as SiN.

  A partition wall 3 is formed on the interlayer insulating film 13. The partition 3 is comprised from resin, for example, photosensitive polyimide. As shown in FIGS. 3 and 4, the partition walls 3 are formed in a stripe shape so that the cross-sectional shape is square, the planar shape is square, and extends in the column direction (vertical direction shown in FIG. 3).

  In addition, the partition wall 3 has a groove formed by the partition wall 3 in any one of three types of pixels in which pixels of three colors of red (R), green (G), and blue (B) are arranged in a delta shape. It is formed so as to extend in a stripe shape from the type of pixel toward the center between the other two types of pixels.

  FIG. 5 is a diagram for explaining the formation position of the partition wall 3 of the present embodiment. As shown in FIG. 5, in the organic EL panel 2, display pixels of any one color are arranged shifted in the column direction by 1.5 pixel pitch for each column, and display pixels of the same color are arranged every other column in the row direction. It is arranged. The partition 3 is in the vicinity of the center of any one type of pixel electrode arranged at the end (left end in FIG. 5) of the pixels (pixel electrodes) arranged in a delta shape in the groove formed by the pair of partitions 3 From this position, it is formed to extend in a stripe shape in the row direction (left-right direction in FIG. 5). For example, it is formed in the groove 4 formed by the partition 3a and the partition 3b so as to extend in a stripe shape (in a straight line) in the row direction from a position near the center of the red (R) pixel electrode. For this reason, in the pixel electrodes arranged in the delta arrangement, the pixel electrodes arranged every other (every other row) in the groove 4 are provided. As a result, only the red (R) pixel electrodes are arranged in the groove 4. In FIG. 5, the groove 4 has a shape that crosses a portion where the green (G) and blue (B) pixel electrodes are adjacent to each other, but between the pixel electrodes actually formed on the substrate 11. There is a gap portion, and as will be described later, an interlayer insulating film 13 is formed in this gap portion (having a gap as shown in FIG. 1). Even if this organic EL material is applied, the organic EL material in the gap portion between adjacent pixel electrodes does not emit light. Therefore, even in the delta arrangement, each color can be separately applied by the nozzle printing method.

  Thus, the partition 3 is formed so that the pixel electrode (anode electrode 14) is divided for each color. For this reason, only one color pixel electrode is provided in the groove formed by the partition walls 3, and a nozzle printing method is used for forming an organic EL layer 15 (hole injection layer 15a, light emitting layer 15b) described later. It is used so that an organic EL material can be applied.

  The surface of the partition wall 3 is preferably subjected to a liquid repellent treatment. By applying a liquid repellent treatment to the surface of the partition 3, it is possible to suppress the solution containing these organic compounds from being sucked to the side surface of the partition 3 when the organic EL layer is formed. This is because mixing can be prevented. Moreover, since it can suppress sucking up to the side surface of the partition 3, the film thickness of the organic EL layer formed in a pixel can be formed uniformly.

  An anode electrode (pixel electrode) 14 is formed on the insulating film 12 formed in the pixel formation region. The anode electrode 14 is made of a conductive material having translucency, for example, ITO (Indium Tin Oxide), ZnO, or the like. The anode electrode 14 is subjected to a surface treatment so as to be lyophilic with respect to the organic compound-containing liquid applied to the pixel region. Each anode electrode 14 is insulated from the anode electrode 14 of another adjacent pixel by the interlayer insulating film 13.

  An organic EL layer 15 is formed on the anode electrode 14. The organic EL layer 15 includes, for example, a hole injection layer 15a and a light emitting layer 15b.

  The hole injection layer 15 a is formed on the anode electrode 14. The hole injection layer 15a supplies holes to the light emitting layer 15b. The hole injection layer 15a is made of an organic polymer material that can inject and transport holes. The hole injection layer 15a is preferably made of a material having a low injection barrier from the anode electrode 14 and a high hole mobility. In this embodiment, the organic compound-containing liquid containing an organic polymer hole injection / transport material is used. As described above, a PEDOT / PSS aqueous solution that is a dispersion in which polyethylenedioxythiophene (PEDOT) as a conductive polymer and polystyrene sulfonic acid (PSS) as a dopant are dispersed in an aqueous solvent is used. The hole injection layer 15a is formed by applying and drying this PEDOT / PSS aqueous solution by a nozzle printing method.

  The light emitting layer 15b is formed on the hole injection layer 15a. The light emitting layer 15 b has a function of generating light by applying a predetermined voltage between the anode electrode 14 and the cathode electrode 16. The light emitting layer 15b is a known polymer light emitting material capable of emitting fluorescence or phosphorescence, for example, red (R), green (G) containing a conjugated double bond polymer such as polyparaphenylene vinyl or polyfluorene. ), A light emitting material for blue (B) color. These luminescent materials are appropriately solutions (dispersions) dissolved (or dispersed) in an aqueous solvent or an organic solvent such as tetralin, tetramethylbenzene, mesitylene, and xylene. The light emitting layer 15b is formed by applying this solution (dispersion) by a nozzle printing method and volatilizing the solvent.

  A cathode electrode (counter electrode) 16 is provided on the light emitting layer 15 b and the partition 3. The cathode electrode 16 is formed from a conductive material such as Ba, Ca, or the like. In the present embodiment, the cathode electrode is composed of a single electrode layer and is connected to GND.

  The reflective metal 18 is formed on the cathode electrode 16. The reflective metal 18 may be any metal that can reflect the light emitted from the light emitting layer 15b toward the cathode electrode 16 toward the anode electrode 14, and is formed of a material and a film thickness that can reflect all visible light, for example. The reflective metal 18 is preferably made of a metal having a high visible light reflectance, and is made of, for example, Ag, AlNdTi, or Al.

  In the display device 1 (organic EL element) configured as described above, light corresponding to the amount of current flowing through the light emitting layer 15b is generated by applying a predetermined voltage between the anode electrode 14 and the cathode electrode 16. . Then, the generated light is reflected directly from the anode electrode 14 and by the reflection metal 18 and is extracted from the anode electrode 14 side.

  Next, a method for manufacturing the display device 1 of the present embodiment will be described. 6 and 7 are diagrams for explaining a method of manufacturing the display device of the present embodiment.

  First, a substrate 11 made of a glass substrate is prepared. Next, a metal film is formed on the substrate 11 by a sputtering method, a vacuum deposition method, or the like, and patterned into the shape of the gate electrode Tr12g and the data line Ld.

  Subsequently, the insulating film 12 is formed on the gate electrode Tr12g and the data line Ld by a CVD (Chemical Vapor Deposition) method or the like. Next, a semiconductor layer SMC is formed on the insulating film 12, and a protective film BL is further formed on the upper surface of the semiconductor layer SMC.

  Next, the anode electrode 14 is formed on the insulating film 12 by sputtering or the like. Subsequently, an ohmic contact layer OHM is formed by a sputtering method, a vacuum evaporation method, or the like. Next, the source electrode Tr12s and the drain electrode Tr12d are formed by sputtering, vacuum deposition, or the like. As a result, the state shown in FIG.

  Subsequently, an interlayer insulating film 13a is formed by CVD, photolithography, or the like so as to cover the transistor Tr12 and the like, and an anode line La is formed by sputtering, vacuum evaporation, or the like. Further, an interlayer insulating film 13b is formed by a CVD method, photolithography, or the like. As a result, the state shown in FIG.

  Next, after a resin, for example, a photosensitive polyimide layer is formed on the interlayer insulating film 13b, a photomask formed in a shape corresponding to the partition wall 3 is formed on the polyimide layer, and patterning is performed. A partition wall 3 is formed as shown in FIG. In this manner, the TFT circuit, the pixel electrode, the interlayer insulating film 13, and the partition 3 made of photosensitive polyimide are formed on the pixel substrate 11.

  In addition, after forming the partition 3, it is preferable to perform the liquid-repellent treatment on the polyimide surface. For example, the substrate 11 on which the partition walls 3 are formed is cleaned using pure water, and an oxygen plasma process is performed for both the lyophilic treatment of the pixel electrodes and the surface modification of the partition walls 3. By oxygen plasma treatment, the imide ring on the polyimide surface is opened, hydrogen derived from water adsorbed on the polyimide surface or absorbed inside is taken in, and a carboxyl group and an amino bond are generated. Next, a liquid repellency treatment is performed on the polyimide surface of the partition wall 3 surface. By the liquid repellent treatment, the carboxyl groups generated on the polyimide surface undergo dehydration polymerization, and the surface of the partition walls 3 is made liquid repellent.

  Next, a PEDOT / PSS aqueous solution in which a hole injection material (PEDOT as a conductive polymer and PSS as a dopant) is dispersed is applied onto the anode electrode 14 by a nozzle printing method. In the present embodiment, since the anode electrode 14 and the surrounding interlayer insulating film 13 are lyophilic, the applied PEDOT ink spreads sufficiently. Furthermore, since the surface of the partition wall 3 is liquid repellent, the applied ink is prevented from being sucked up. After the application of the PEDOT / PSS aqueous solution, for example, by drying on a hot plate at a temperature of 100 ° C. or higher, the hole injection layer 15a is formed on the anode electrode 14 as shown in FIG. The

  Subsequently, a solution obtained by dissolving red, green, and blue light emitting materials (polyfluorene-based) in an organic solvent such as tetralin, tetramethylbenzene, and mesitylene is formed on the hole injection layer 15a by a nozzle printing method. . As described above, since the surface of the partition wall 3 is liquid repellent, color mixing with adjacent pixels is prevented, and red, green, and blue can be separated accurately. After the light emitting material is formed, the residual solvent is removed by drying with a hot plate in a nitrogen atmosphere or drying with a sheathed heater in a vacuum. Thereby, as shown in FIG.7 (c), the light emitting layer 15b is formed on the positive hole injection layer 15a.

  Here, since the partition 3 is formed in the groove formed by the pair of partition 3 so that only one color pixel electrode is provided, in the application of the solution by the nozzle printing method, as shown in FIG. In addition, the nozzle 21 can be scanned along the stripe-shaped groove. For this reason, the organic EL material discharged from the nozzle 21 can be applied on the anode electrode 14 of a predetermined color. Therefore, in the formation of the organic EL layer 15 (the hole injection layer 15a and the light emitting layer 15b), the organic EL material to be applied can be separately applied using the nozzle printing method. As shown in FIG. 8, the nozzle 21 has a discharge portion 21a from which the organic EL material is discharged, and the organic EL material discharged from the discharge portion 21a flows into a groove formed by the pair of partition walls 3. It is. Here, the width in the row direction of the groove formed by the partition walls 3 is formed to be larger than the outer dimension of the discharge portion 21a.

  Next, the cathode electrode 16 made of Ca, Ba or the like is formed on the pixel substrate on which the light emitting layer 15a has been formed by vacuum deposition, sputtering, or the like. Next, the reflective metal 18 is formed on the cathode electrode 16 and the partition 3 by, for example, sputtering or vapor deposition, whereby the display device 1 is completed.

  As described above, according to the present embodiment, the partition 3 is formed so that only one color pixel electrode is provided in the groove formed by the partition 3. For this reason, for a display device having a pixel arrangement in which display pixels of the same color, such as a delta arrangement, are not continuously arranged in one direction, the application of the organic EL material to be applied using the nozzle printing method Can be divided.

  In this embodiment, since the surface of the partition wall 3 made of polyimide is liquid repellent, the applied solution is sucked into the partition wall when forming the hole injection layer 15a and the light emitting layer 15b. Is suppressed. For this reason, the uniformity of the film thickness profile on the pixel electrode (anode electrode 14) can be improved.

  In addition, this invention is not restricted to said embodiment, A various deformation | transformation and application are possible. Hereinafter, other embodiments applicable to the present invention will be described.

  In the above embodiment, the present invention has been described by taking as an example the case where the partition 3 (and the groove formed by the partition 3) is formed in a stripe shape. For example, as shown in FIG. You may provide the deformation | transformation part 31 which narrows. The deformed portion 31 is formed so that the width of the groove formed by the partition 3 is increased, that is, the width of the partition 3 is reduced so that a large pixel electrode (anode electrode 14) is provided in the groove. The deformed portion 31 is deformed according to (in accordance with) the shape of the anode electrode 14. In the present embodiment, since the shape of the anode electrode 14 is square, the deformed portion 31 is formed in a concave shape so that the width of the anode electrode 14 provided in the groove is widened. As described above, since the deformed portion 31 is provided in the partition wall 3, even if the partition wall 3 is formed so that only one color pixel electrode is provided in the groove formed by the partition wall 3, the pixel electrode ( There is no need to make the anode electrode 14) small. For this reason, the organic EL material to be applied can be separately applied using the nozzle printing method without reducing the aperture ratio. In this case, as shown in FIG. 10, in order to secure the formation region of the transistors Tr11 and Tr12, the transistors Tr11 and Tr12 are preferably provided below the region where the deformed portion 31 of the partition wall 3 is not provided. In the case of the configuration shown in FIGS. 9 and 10, the width of the partition 3 in the row direction varies between the region corresponding to the pixel electrode and the other region, and the width of the groove formed by the pair of partitions 3 is also different. The width of the groove in the region corresponding to the pixel electrode is smaller than the width of the groove in the region corresponding to the pixel electrode. In this case, the width of the narrowest portion of the groove formed by the partition wall 3 is formed larger than the outer dimension of the discharge part 21a.

  In the above embodiment, the present invention has been described by taking the case where the organic EL layer 15 is formed of the hole injection layer 15a and the light emitting layer 15b as an example. For example, the organic EL layer 15 includes the hole injection layer 15a and the light emitting layer 15b. An interlayer layer having a function of blocking electrons moving in the light emitting layer 15b may be formed therebetween. In this case, there is an effect of increasing the recombination probability between electrons and holes in the light emitting layer 15b. This interlayer layer is preferably made of a material having a high hole mobility and an electron blocking function.

  Further, an electron transport layer may be provided on the light emitting layer 15b. In this case, the efficiency of electron injection into the light emitting layer 15b can be increased and a hole blocking function can be provided. The electron transport layer is preferably made of an alkaline earth metal such as Mg, Ca, Ba, an oxide thereof, or an alloy with a metal.

  In the above embodiment, the present invention has been described by taking the case where the pixel driving circuit Dc has two transistors (TFTs) as an example. However, for example, even if the pixel driving circuit Dc has three TFTs, Alternatively, it may have four or more TFTs.

  In the above embodiment, the present invention has been described by taking the case where the light emitting element is an organic EL element as an example. Absent.

It is a figure which shows an example of the pixel arrangement | sequence of the display apparatus of embodiment of this invention. It is a figure which shows an example of the circuit structure of the display pixel of the active drive system of a display apparatus. It is a figure which shows the top view of a display pixel. It is the IV-IV sectional view taken on the line of FIG. It is a figure for demonstrating the formation position of a partition. It is a figure for demonstrating the manufacturing method of a display apparatus. It is a figure for demonstrating the manufacturing method of a display apparatus. It is a figure for demonstrating the coating method of the solution by a nozzle printing system. It is a figure which shows an example of the pixel arrangement | sequence of the display apparatus of other embodiment. It is a figure which shows the top view of the display pixel of other embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 2 ... Organic EL panel, 3 ... Partition, 11 ... Substrate, 12 ... Insulating film, 13 ... Interlayer insulating film, 14 ... Anode electrode, 15 ... Organic EL layers 15, 15a ... Hole injection layer, 15b ... Light emitting layer, 16 ... Cathode electrode

Claims (14)

A display device in which a plurality of color display pixels having light emitting elements are arranged in a row and column direction,
The display pixels of the plurality of colors are arranged such that the display pixels of any one color are shifted in the column direction by 1.5 pixel pitch for each column, and the display pixels of the same color are arranged every other column in the row direction,
Each display pixel has a pixel electrode that forms a light emitting portion of the light emitting element,
A plurality of partition walls formed so as to partition the pixel electrodes of the display pixels for each row;
A plurality of grooves extending in the row direction are formed by a pair of the partition walls in the plurality of partition walls,
The display device, wherein the pixel electrodes of the display pixels of the same color arranged in every other column in the row direction are provided inside the grooves.   The display device according to claim 1, wherein each of the grooves is formed to have a constant width in the row direction, and each of the partition walls has a constant width in the row direction. Each of the grooves is formed so that a width in a row direction in a region corresponding to the pixel electrode of the display pixels of the same color arranged in every other column is wider than a width in a row direction in other regions.
Each partition is an area corresponding to the pixel electrode of the display pixel of the same color arranged every other column, and the width in the row direction is narrower than the width in the row direction in other areas. The display device according to claim 1, further comprising a deformed portion. The display pixel includes a pixel circuit having at least one active element that drives the light emitting element;
The display device according to claim 3, wherein the active element in the pixel circuit is formed below a region of the partition wall where the deformed portion is not formed. A liquid containing an organic compound continuously discharged from a nozzle having a discharge portion is applied onto the pixel electrodes of the display pixels of the same color arranged in every other row in each of the grooves, and light emission of the light emitting element A layered organic compound layer is formed,
5. The display device according to claim 1, wherein a width of each groove in a row direction is at least larger than an outer shape of a discharge portion of the nozzle.   The display device according to claim 1, wherein a liquid repellent treatment is performed on a surface of the partition wall.   The display device according to claim 1, wherein the light emitting element is an organic electroluminescence element. A method of manufacturing a display device in which a plurality of color display pixels having light emitting elements are arranged in a row and column direction,
The pixel electrodes of the display pixels of the plurality of colors are arranged so that the display pixels of any one color are shifted in the column direction by 1.5 pixel pitch for each column, and the display pixels of the same color are arranged every other column in the row direction. Forming to be arranged; and
Forming a plurality of partition walls extending in a row direction so as to partition the pixel electrodes of the display pixels for each row;
The organic compound-containing liquid is applied along a plurality of grooves formed by a pair of the partition walls in the plurality of partition walls, thereby forming a light emitting layer of the light emitting element on the pixel electrode in each groove. Forming the organic compound layer, and a method for manufacturing a display device.   In the step of forming the plurality of partition walls, the plurality of partition walls are arranged in every other column in the row direction in the grooves of the plurality of grooves formed by the pair of partition walls in the plurality of partition walls. The method for manufacturing a display device according to claim 8, wherein the pixel electrode of the display pixel is provided.   10. The method according to claim 8, wherein, in the step of forming the plurality of partition walls, the partition walls are formed to have a constant width in the row direction, and the widths of the grooves in the row direction are made constant. Manufacturing method of display device.   In the step of forming the plurality of partition walls, the width in the row direction is set in the region corresponding to the pixel electrode of the display pixel of the same color arranged in every other column in each partition wall, and the row direction in the other regions. By forming a deformed portion narrower than the width, the width in the row direction in the region corresponding to the pixel electrode of the display pixel of the same color arranged in every other column of each groove is set in the row direction in the other regions. 10. The method for manufacturing a display device according to claim 8, wherein the display device is wider than the width. The display pixel includes a pixel circuit having at least one active element that drives the light emitting element;
12. The method for manufacturing a display device according to claim 11, further comprising a step of forming the active element of the pixel circuit below a region of the partition wall where the deformed portion is not formed.   The method for manufacturing a display device according to claim 8, further comprising a step of performing a liquid repellent treatment on a surface of the partition wall.   The method for manufacturing a display device according to claim 8, wherein an organic electroluminescence element is used as the light emitting element.

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