JP3895077B2 - Manufacturing method of organic LED display - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention provides an organic LED display with excellent display quality.Lee'sIt relates to a manufacturing method.
[0002]
[Prior art]
An organic LED element (pixel) is basically composed of a light emitting layer or an organic layer composed of a light emitting layer and a charge transport layer and an electrode sandwiching the organic layer.
Conventionally, in an organic LED element using a polymer material, an organic layer is formed by applying a wet method such as a spin coating method, a dip method, or a doctor blade method. However, these coating methods make it difficult to pattern the organic layer, and it has been difficult to realize a full-color organic LED display in which an organic layer emitting three primary colors needs to be arranged for each pixel.
[0003]
Therefore, in recent years, a method for forming an organic layer by patterning by an ink jet method has been proposed (see Japanese Patent Application Laid-Open No. 10-12377 and Appl. Phys. Lett. 72, 5519 (1998)).
However, the organic layer film formed by the ink jet method has a defect that the surface shape is rough as compared with the film formed by the spin coat method (see FIG. 5). In the figure, 1 is a substrate, 2 is a first electrode, 3 is an organic layer, 5 is a partition, and 14 is an inkjet head, nozzle or needle.
[0004]
Thus, when the surface shape of the film of the organic layer is rough, there occurs a problem that unevenness of light emission occurs during light emission and the display quality as an organic LED display is lowered. In addition, there is a problem that it is very difficult to form a uniform electrode film on such a rough film.
Further, when an organic layer is formed by discharging a coating liquid for forming an organic layer a plurality of times by an inkjet method, an interface is formed between the films formed for each discharge (see FIG. 6, The figure number is the same as FIG. 5), and this interface has a problem of adversely affecting the electrical characteristics of the organic LED element.
[0005]
On the other hand, in the case of producing an organic LED display having a plurality of pixels by applying and forming an organic layer by the method using the coating liquid as described above, in order to prevent mixing of the organic layers, It is necessary to form a partition wall. However, due to the surface tension of the coating liquid for forming the organic layer used, an organic layer may be formed without filling the corners and corners of the pixels. In this case, a short circuit occurs between the electrodes. It happens (see FIG. 8). In the figure, 1 is a substrate, 2 is a first electrode, 3 is an organic layer, 4 is a second electrode, 5 is a partition, and 15 is a portion not filled with coating liquid.
[0006]
Therefore, in order to prevent a short circuit between the electrodes, a method of arranging the electrodes so as to avoid the corners of the pixels by narrowing the width of the electrodes can be considered, but in this case, the light emitting regions may be brought closer to each other. It becomes difficult and the problem that an aperture ratio becomes low arises.
[0007]
[Problems to be solved by the invention]
It is an object of the present invention to provide an organic LED display having a high aperture ratio that is free from uneven light emission during light emission and short-circuiting between electrodes, and has excellent display quality and electrical characteristics.
[0008]
[Means for Solving the Invention]
As a result of intensive research from such a viewpoint, the present inventors have formed an organic layer by a method of forming from a coating liquid for forming an organic layer containing a polymer material, and then softened the polymer material constituting the organic layer. The organic layer is planarized by heat treatment at a temperature equal to or higher than the temperature, preferably equal to or lower than the softening temperature of the material constituting the partition wall (see FIG. 7, the figure number in the figure is the same as FIG. 5), and It has been found that an organic layer can be formed evenly at the corners and corners of the pixel without any gap (see FIG. 9, the figure numbers in the figure are the same as those in FIG. 8), and the present invention has been completed. .
[0009]
  Thus, according to the present invention, there is provided an organic LED display in which a plurality of organic LED elements (pixels) including a light emitting layer or an organic layer composed of a light emitting layer and a charge transport layer are arranged and a partition is provided at least in part between the pixels. After forming at least one organic layer by a method using a coating liquid containing a polymer material, the glass transition temperature of the polymer material constituting the organic layer (showing the glass transition temperature) In the absence of a glass transition temperature, and a temperature lower than the glass transition temperature of the material constituting the partition wall (the melting point if the glass transition temperature is not indicated). Provided is a method for producing an organic LED display, wherein the liquid has a viscosity of 10 mPa · s or less at 20 ° C..
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the organic LED element (pixel) is generally composed of a substrate 1, a first electrode 2, an organic layer 3, and a second electrode 4. The organic LED display of the present invention is configured by arranging a plurality of such pixels. When forming such a plurality of pixels by a method of forming from a coating liquid, in order to prevent the organic layer from overlapping, the film thickness distribution, and the flow of the organic layer during heating and drying, a partition wall 5 is provided between the pixels. Form. In addition, from the viewpoint of display quality of the organic LED display, for example, contrast, it is preferable that the deflection plate 7 is provided outside the substrate. Further, from the viewpoint of reliability of the organic LED display, the second electrode 4 is provided. A sealing film or a sealing substrate 6 is preferably provided on the top.
[0011]
As the substrate 1, any of a quartz substrate, a glass substrate, a plastic substrate, and the like can be used, and the substrate 1 is not particularly limited thereto.
[0012]
The organic layer 3 includes a light emitting layer or a light emitting layer and a charge transport layer, and the light emitting layer and the charge transport layer may have either a single layer structure or a multilayer structure, respectively.
In order to enable multicolor light emission as an organic LED display, it is necessary to form a film by a method in which at least one layer in the organic layer 3 is formed from a coating liquid. Therefore, when the organic layer 3 has a multilayer structure, it is necessary to form a film by a method in which at least one organic layer is formed from a coating liquid. For example, a printing method, an inkjet head, a method of discharging with a nozzle or a needle, and the like can be mentioned, and a method of discharging with an inkjet head or a needle is particularly preferable. However, other organic layers may be formed by other known methods, for example, a dry method such as a vacuum deposition method, a wet method such as a spin coating method and a doctor blade method.
[0013]
The materials of the first electrode 2 and the second electrode 4 that sandwich the organic layer 3 are selected according to the configuration of the organic LED display. That is, in the organic LED display, when the substrate 1 is a transparent substrate and the first electrode 2 is a transparent electrode, light emission from the organic layer is emitted from the substrate 1 side. The second electrode 4 is preferably a reflective electrode, or a reflective film (not shown) is preferably provided on the surface of the second electrode 4 that is not adjacent to the organic layer 3.
Conversely, when the second electrode 4 is a transparent electrode, light emitted from the organic layer is emitted from the second electrode 4 side, so that the first electrode 2 is used as a reflective electrode, or A reflective film (not shown) is preferably provided between the substrate 1 and the substrate 1.
[0014]
As a material of the transparent electrode, for example, CuI, ITO (indium tin oxide), SnO₂ZnO and CuAlO₂Examples of the material of the reflective electrode include metals such as aluminum and calcium, alloys such as magnesium-silver and lithium-aluminum, laminated films of metals such as magnesium / silver, and lithium fluoride / aluminum. And a laminated film of an insulator and a metal.
[0015]
The partition wall 5 may have a single layer structure or a multilayer structure, and may be disposed between pixels or may be disposed between different emission colors. As a material for the partition wall, a material in which a light emitting material, a charge transport material or a polymer material is dissolved or dispersed, that is, a material which is insoluble or hardly soluble in a solvent of an organic layer forming coating solution is preferable. In order to improve display quality as an organic LED display, it is particularly preferable to use a black matrix material (for example, resin black for liquid crystal).
[0016]
Next, the arrangement of the organic layer of the organic LED display will be described.
In the organic LED display of the present invention, a plurality of organic LED elements (pixels) including a light emitting layer or an organic layer composed of a light emitting layer and a charge transport layer are disposed, and a partition is provided at least at a part between the pixels. As the arrangement, for example, as shown in FIG. 2A, a structure (striped arrangement) in which a plurality of organic LED elements are arranged in a matrix via partition walls 5 can be mentioned. These pixels are preferably composed of a red (R) light emitting pixel 8, a green (G) light emitting pixel 9, and a blue (B) light emitting pixel 10. Further, the pixel arrangement may be a mosaic arrangement, a delta arrangement, and a square arrangement as shown in FIGS. 2 (b), 2 (c), and 2 (d), respectively. The ratio of each of the R light emitting pixel, the G light emitting pixel, and the B light emitting pixel is not necessarily 1: 1: 1 as shown in FIG. 2D, and the occupied area of each pixel is the same. May be different for each pixel.
[0017]
Next, a connection method between the first electrodes and the second electrodes corresponding to each pixel will be described.
In the organic LED display of the present invention, as shown in FIG. 3A, the first electrode 2 and the second electrode 4 sandwiching the organic layer 3 are formed as stripe-shaped electrodes orthogonal to each other on a common substrate 1. Alternatively, the first electrode 2 or the second electrode 4 may be connected to a common electrode via a thin film transistor (TFT) 11 as shown in FIG. In the figure, 12 indicates a source bus line, and 13 indicates a gate bus line.
[0018]
Next, the organic layer forming coating solution will be described.
The organic layer forming coating liquid depends on the layer structure of the organic layer, but in the case of a multilayer structure, it can be divided into a light emitting layer forming coating liquid and a charge transport layer forming coating liquid. Here, the charge transport layer means an electron transport layer, an electron injection layer, a hole transport layer, and a hole injection layer.
[0019]
As the light emitting layer forming coating solution, a known polymer light emitting material for organic LED dissolved or dispersed in a solvent, or a known low molecular weight light emitting material for organic LED and a known polymer material are used as a solvent. Those dissolved or dispersed may be mentioned.
[0020]
Examples of the polymer light-emitting material include poly (2-decyloxy-1,4-phenylene) (DO-PPP), poly [2,5-bis [2- (N, N, N-triethylammonium) ethoxy]- 1,4-phenylene-alt-1,4-phenylene] dibromide (PPP-NEt_Three ⁺), Poly [2- (2′-ethylhexyloxy) -5-methoxy-1,4-phenylenevinylene] (MEH-PPV), poly [5-methoxy- (2-propanoxysulfonide) -1,4 -Phenylene vinylene] (MPS-PPV) and poly [2,5-bis (hexyloxy) -1,4-phenylene- (1-cyanovinylene)] (CN-PPV). It is not limited.
[0021]
Examples of the low-molecular light-emitting material include dicyanomethylene derivatives (DCM2), 2- (4-t-butylphenyl) -5- (4-biphenylyl) -1,3,4-oxadiazole (PBD). , Tetraphenylbutadiene (TPB), coumarin (for example, Coumarin 6), Nile red, oxadiazole derivatives, and the like, but are not particularly limited in the present invention.
[0022]
The polymer material assists the formation of the organic layer when the light emitting material itself has no or low film forming ability.
Examples of the polymer material include polycarbonate (PC, mp = 163 ° C.), ethylene-vinyl acetate copolymer (EVA, mp = 99 ° C.), polymethyl methacrylate (PMMA, Tg = 114 ° C., mp> 300 ° C.). And polyvinyl carbazole (PVCz, Tg = 150 to 180 ° C., mp> 300 ° C.) and the like, but are not particularly limited in the present invention.
[0023]
As the solvent for dissolving or dispersing the above-described polymer light-emitting material, low-molecular light-emitting material, and polymer material, any solvent used in the art can be used. Among them, dichloromethane, ethylene glycol, propylene glycol, triethylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, glycerin, formamide, N-methyl-2-pyrrolidone, Low vapor pressure solvents such as cyclohexanone, methanol, 1-propanol, octane, nonane and decane are preferred.
[0024]
In the light emitting layer forming coating solution, additives for pH adjustment, viscosity adjustment and filling acceleration, as required, known hole transport materials and charge transport materials for organic LEDs and organic photoconductors, A dopant such as an acceptor and a donor may be added. Examples of the hole transport material include N, N′-bis- (3-methylphenyl) -N, N′-bis- (phenyl) -benzidine (TPD) and N, N′-di (naphthalene-1- Yl) -N, N′-diphenyl-benzidine (NPD) and the like, and examples of the electron transport material include 3- (4-biphenylyl) -4-phenylene-5-t-butylphenyl-1,2 , 4-triazole (TAZ) and tris (8-hydroxynato) aluminum (Alq3).
[0025]
As a coating liquid for forming a charge transport layer, a known polymer charge transport material for organic LED or organic photoconductor dissolved or dispersed in a solvent, or a known solution for organic LED or organic photoconductor A low molecular charge transport material and a known polymer material dissolved or dispersed in a solvent can be used.
[0026]
Examples of the polymer charge transport material include polyaniline (PANI), 3,4-polyethylenedioxythiophene (PEDT), polycarbazole (PVCz), poly (triphenylamine derivative) (Poly-TPD), and poly (oxadi). An azole derivative (Poly-OXZ) etc. are mentioned.
[0027]
Examples of the low molecular charge transport material include N, N′-bis- (3-methylphenyl) -N, N′-bis- (phenyl) -benzidine (TPD), N, N′-di (naphthalene). -1-yl) -N, N′-diphenyl-benzidine (NPD) and oxadiazole derivatives.
[0028]
Examples of the polymer material and the solvent for dissolving or dispersing the polymer charge transport material, the low molecular charge transport material, and the polymer material described above include the polymer materials and solvents exemplified in the light emitting layer forming coating solution.
Further, the charge transport layer forming coating solution may be added with additives such as pH adjusting agent, viscosity adjusting agent and filling promoting agent, and dopants such as acceptor and donor as required.
[0029]
The organic layer forming coating solution such as the light emitting layer forming coating solution and the charge transport layer forming coating solution is adjusted to adjust the mixing ratio of the solid content and the solvent so that the viscosity at 20 ° C. is 10 mPa · s or less. Is preferred. The coating liquid is preferably prepared so that its surface tension is 40 dyn / cm or more.
[0030]
In the method of the present invention, an organic layer is formed by a method of forming from a coating liquid for forming an organic layer, and then heat treatment is performed at a temperature higher than the softening temperature of the polymer material constituting the organic layer.
[0031]
FIG. 4 is a schematic view showing an organic layer forming step in the method of the present invention. In the figure, 1 is a substrate, 2 is a first electrode, 5 is a partition, and 14 is an inkjet head, nozzle or needle.
The coating liquid is ejected from the inkjet head, nozzle or needle 14 to form an organic layer on the first electrode 2 or on the organic layer previously formed. This step may be a single discharge using one kind of coating liquid for one pixel, or a plurality of times of discharging using a plurality of kinds of coating liquids.
[0032]
As a method of forming from the coating liquid, any of the known methods can be applied, but taking into consideration the alteration of the coating liquid for forming the organic layer due to heat, a piezo method with less influence of heat and a discharge method using compressed gas are preferable. Among these, a method of discharging the coating liquid from an ink jet, a nozzle or a needle is particularly preferable.
Furthermore, from the viewpoint of production efficiency, it is preferable to use a plurality of inkjet heads, nozzles or needles that discharge the coating liquid, for each coating liquid having a different emission color. The organic layer is preferably formed with a film thickness of less than 1 μm. If the film thickness is thicker than 1 μm, the driving voltage is remarkably increased due to the resistance of the organic layer, which is not preferable.
[0033]
After the organic layer is formed by the above method, it is preferably heat-treated by a known method immediately after the formation of the organic layer.
The heating temperature is preferably higher than the softening temperature of the polymer material constituting the organic layer, preferably at a temperature equal to or lower than the softening temperature of the material constituting the partition wall. Here, the softening temperature is a temperature at which the polymer material softens and means a melting point or a glass transition temperature.
[0034]
Further, when the organic layer has a multilayer structure, in order to prevent the plurality of organic layers from being melted and mixed by heat treatment, the softening temperature of the polymer material constituting the organic layer formed earlier is It is preferable that the temperature is higher than the softening temperature of the polymer material constituting the organic layer to be formed later. The heating temperature in this case is preferably in the range where the former softening temperature is the upper limit and the latter softening temperature is the lower limit.
[0035]
Although the heating time varies depending on the heating temperature, it may be at least a time for flattening the organic layer, and usually about 5 minutes to 8 hours is sufficient.
Examples of the heating method include a hot plate and an oven. The heating environment is not particularly limited, but it is preferably performed in an inert gas or under vacuum in order to prevent deterioration of the polymer material such as oxidation.
[0036]
【Example】
Examples The present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.
[0037]
Example 1
An ITO transparent stripe electrode having a width of 200 μm and a pitch of 220 μm was formed as a first electrode on a glass substrate with a thickness of 130 nm with ITO (indium tin oxide) by photolithography. Next, the substrate was ultrasonically cleaned with isopropyl alcohol, acetone and pure water for 10 minutes, respectively, and further subjected to UV ozone treatment and O 2.₂Each plasma treatment was performed for 10 minutes.
Next, a negative photosensitive polyimide film having a film thickness of 20 μm (manufactured by Hitachi Chemical DuPont, Tg = 260 ° C.) was formed on the substrate by spin coating. Next, mask exposure was performed to wash away the resist residue, and a partition having a pitch of 340 μm in the direction parallel to the ITO electrode and a pitch of 220 μm in the direction perpendicular to the ITO electrode and a width of 40 μm was formed by a photoresist method.
[0038]
A hole transport layer forming coating liquid was discharged by a commercially available inkjet printer to form a hole transport layer having a thickness of 75 nm on the substrate. As a coating solution for forming a hole transport layer, polycarbonate (PC, mp = 163 ° C.) having a weight ratio of 70:30 and N, N′-bis- (3-methylphenyl) -N, N′-bis- (phenyl) ) -Benzidine (TPD) dispersed in dichloromethane was used. Immediately after forming the hole transport layer, the obtained substrate was heat-treated at 170 ° C. for 1 hour.
[0039]
Next, a light emitting layer forming coating solution was discharged by a commercially available ink jet printer, and was applied by patterning on the hole transport layer to form a light emitting layer having a thickness of 100 nm. The coating solution for forming the light emitting layer was an ethylene-vinyl acetate copolymer (EVA, mp = 99 ° C.) having a weight ratio of 70:20:10, a dicyanomethylene derivative (DCM2), and 2- (4-t) for the red light emitting layer. -Butylphenyl) -5- (4-biphenylyl) -1,3,4-oxadiazole (PBD) dispersed in methanol, EVA having a weight ratio of 70:20:10 for a green light emitting layer Coumarin 6 and PBD dispersed in dichloromethane, and 70:20:10 weight ratio EVA, tetraphenylbutadiene (TPB) and PBD dispersed in methanol for blue light emitting layer Using. Immediately after forming the light emitting layer, the obtained substrate was heat-treated at 110 ° C. for 1 hour.
[0040]
Next, an LiF film having a thickness of 0.9 nm is formed on the light emitting layer by vapor deposition, and further, an Al electrode having a thickness of 0.2 μm, a width of 330 μm, and a pitch of 340 μm is formed as a second electrode by vapor deposition using a shadow mask. Formed. Finally, the obtained element was sealed with an epoxy resin.
In the organic LED display produced as described above, no short circuit between the first electrode and the second electrode was observed. Further, when a pulse voltage of 40 V was applied to the organic LED display, red, green and blue light emission was observed.
The aperture ratio of this element was 72%.
[0041]
Comparative Example 1
An organic LED display was produced in the same manner as in Example 1 except that heat treatment was not performed immediately after forming the hole transport layer and the light emitting layer.
In the obtained organic LED display, a short circuit was observed between the first electrode and the second electrode.
[0042]
Comparative Example 2
Other than not performing heat treatment immediately after forming the hole transport layer and the light emitting layer, and forming an Al electrode having a film thickness of 0.2 μm, a width of 240 μm, and a pitch of 340 μm as the second electrode by vapor deposition using a shadow mask. Produced an organic LED display in the same manner as in Example 1.
In the obtained organic LED display, no short circuit between the first electrode and the second electrode was observed. Further, when a pulse voltage of 40 V was applied to the organic LED display, red, green and blue light emission was observed.
The aperture ratio of this element was 48%.
[0043]
Example 2
An ITO transparent stripe electrode having a width of 200 μm and a pitch of 220 μm was formed as a first electrode on a glass substrate with ITO having a thickness of 130 nm by photolithography. Next, the substrate was ultrasonically cleaned with isopropyl alcohol, acetone and pure water for 10 minutes, respectively, and further subjected to UV ozone treatment and O 2.₂Each plasma treatment was performed for 10 minutes.
Next, a positive resist film (manufactured by JSR, Tg = 250 ° C.) having a film thickness of 30 μm was formed on this substrate by spin coating. Next, mask exposure was performed to wash away the resist residue, and a partition having a pitch of 340 μm in the direction parallel to the ITO electrode and a pitch of 220 μm in the direction perpendicular to the ITO electrode and a width of 40 μm was formed by a photoresist method.
[0044]
A hole transport layer forming coating solution was discharged by a commercially available dispenser to form a hole transport layer having a thickness of 75 nm on the substrate. As a coating liquid for forming a hole transport layer, a dispersion of PC (mp = 163 ° C.) having a weight ratio of 70:30 and TPD in dichloromethane was used. Immediately after forming the hole transport layer, the obtained substrate was heat-treated at 170 ° C. for 1 hour.
[0045]
Next, the light emitting layer forming coating solution was discharged by a commercially available dispenser, and was applied by patterning onto the hole transport layer to form a light emitting layer having a thickness of 100 nm. The light-emitting layer forming coating solution was prepared by dispersing EVA (mp = 99 ° C.), DCM2 and PBD in a weight ratio of 70:20:10 in methanol for the red light-emitting layer, and weight ratio of 70:20 for the green light-emitting layer. 20:10 EVA, Coumarin 6 and PBD dispersed in dichloromethane, and 70:20:10 EVA, TPB and PBD dispersed in methanol were used for the blue light emitting layer. Immediately after forming the light emitting layer, the obtained substrate was heat-treated at 110 ° C. for 1 hour.
[0046]
Next, an LiF film having a thickness of 0.9 nm is formed on the light emitting layer by vapor deposition, and further, an Al electrode having a thickness of 0.2 μm, a width of 330 μm, and a pitch of 340 μm is formed as a second electrode by vapor deposition using a shadow mask. Formed. Finally, the obtained element was sealed with an epoxy resin.
In the organic LED display produced as described above, no short circuit between the first electrode and the second electrode was observed. Further, when a pulse voltage of 40 V was applied to the organic LED display, red, green and blue light emission was observed.
The aperture ratio of this element was 72%.
[0047]
Comparative Example 3
An organic LED display was produced in the same manner as in Example 2 except that the heat treatment was not performed immediately after forming the hole transport layer and the light emitting layer.
In the obtained organic LED display, a short circuit was observed between the first electrode and the second electrode.
[0048]
Comparative Example 4
Other than not performing heat treatment immediately after forming the hole transport layer and the light emitting layer, and forming an Al electrode having a film thickness of 0.2 μm, a width of 240 μm, and a pitch of 340 μm as the second electrode by vapor deposition using a shadow mask. Produced an organic LED display in the same manner as in Example 2.
In the obtained organic LED display, no short circuit between the first electrode and the second electrode was observed. Further, when a pulse voltage of 40 V was applied to the organic LED display, red, green and blue light emission was observed.
The aperture ratio of this element was 48%.
[0049]
【The invention's effect】
The organic LED display manufacturing method of the present invention includes an organic LED element (pixel) having a plurality of organic LED elements (pixels) including a light emitting layer or an organic layer composed of a light emitting layer and a charge transport layer, and having a partition wall at least partially between the pixels. A method of manufacturing an LED display, wherein at least one organic layer is formed by a method of forming from a coating liquid containing a polymer material, and then heat treatment is performed at a temperature higher than the softening temperature of the polymer material constituting the organic layer Including the step of:
Therefore, the organic layer can be flattened, and the organic layer can be formed evenly at the corners and corners of the pixel without any gaps. Therefore, there is no uneven light emission or short-circuit between electrodes, and display quality and electrical properties are eliminated. An organic LED display having a high aperture ratio and excellent characteristics can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of an organic LED display of the present invention.
FIG. 2 is a schematic partial plan view of the arrangement of the light emitting layer of the organic LED display of the present invention.
FIG. 3 is a schematic partial plan perspective view of an organic LED display of the present invention.
FIG. 4 is a schematic view of an organic layer forming process according to the present invention.
FIG. 5 is a schematic cross-sectional view of an organic layer produced by a conventional inkjet method.
FIG. 6 is a schematic cross-sectional view of an organic layer produced by a conventional inkjet method.
FIG. 7 is a schematic cross-sectional view of an organic layer produced by the method of the present invention.
FIG. 8 is a schematic partial plan view of an organic layer produced by a conventional inkjet method.
FIG. 9 is a schematic partial plan view of an organic layer produced by the method of the present invention.
[Explanation of symbols]
1 Substrate
2 First electrode
3 Organic layer
4 Second electrode
5 Bulkhead
6 Sealing film or sealing substrate
7 Polarizing plate
8 Red light emitting pixels
9 Green light emitting pixels
10 Blue light emitting pixels
11 Thin film transistor (TFT)
12 Source bus line
13 Gate bus line
14 Inkjet head, nozzle or needle

Claims (3)

  A method for manufacturing an organic LED display in which a plurality of organic LED elements (pixels) including a light emitting layer or an organic layer composed of a light emitting layer and a charge transport layer are arranged and having a partition wall at least at a part between the pixels. After forming at least one organic layer by a method using a coating solution containing a material, the glass transition temperature of the polymer material constituting the organic layer (melting point if no glass transition temperature is shown) And a heat treatment at a temperature lower than the glass transition temperature of the material constituting the partition walls (or the melting point when no glass transition temperature is shown), and the coating liquid containing the polymer material is 10 mPa · s at 20 ° C. The manufacturing method of the organic LED display characterized by having the following viscosity.   The manufacturing method according to claim 1, wherein the organic layer is formed from the coating liquid by a method of discharging the coating liquid from an inkjet, a nozzle, or a needle.   The manufacturing method according to claim 1, wherein the organic layer is formed with a film thickness thinner than 1 μm.

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