JP2015162588A - Organic electroluminescent display device and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic EL display device and the like, the organic EL display device being capable of suppressing color shift of a display image caused due to light leakage to an adjacent pixel.SOLUTION: An organic EL display device 10 includes: a substrate 1; an organic EL element 2 formed on the substrate and disposed in a pixel region; an insulating layer 3 formed on the substrate and disposed between the pixel regions; a plurality of coloring layers 4 formed on the organic EL element and disposed in the pixel region; and a light-shielding layer 5 formed on the insulating layer and defining a pixel. The width of the light-shielding layer is a width that does not allow light effective for the display of the organic EL element of one pixel region to pass through the coloring layer in adjacent other pixel region.

Description

  The present invention relates to an organic electroluminescence display device capable of suppressing color shift of a display image due to light leakage to adjacent pixels.

  The organic electroluminescence display device has high visibility due to self-coloring, it is an all-solid-state display unlike a liquid crystal display device, so it has excellent impact resistance, has a fast response speed, is less affected by temperature changes, In addition, it has attracted attention because of its advantages such as a large viewing angle, and research and development and commercialization are being promoted as flat panel displays following liquid crystal display devices and plasma displays. Hereinafter, electroluminescence may be abbreviated as EL.

  The organic EL display device can be broadly divided into three colors, a color conversion method, and a color filter method. The three-color coating method uses a red, green, and blue light-emitting layer, the color conversion method uses a blue light-emitting layer to combine the color conversion layers, and the color filter method uses a white light-emitting layer. It is a method of using and combining color filters. In the three-color painting method, a color filter may be used in combination to increase color purity.

  In an organic EL display device using a color filter, for example, a device having a configuration in which two substrates, a color filter substrate and an organic EL element substrate, are opposed to each other and sealed between both substrates is widely used. It has been. In such an organic EL display device, a colored layer is disposed for each pixel in the color filter, and a light emitting layer is disposed for each pixel in the organic EL element, and the pixel element is controlled and driven by the TFT element. In such an organic EL display device, light from a light emitting layer in a certain pixel region directly enters a colored layer in an adjacent pixel region, or passes through the colored layer in the adjacent pixel region and passes through the adjacent pixel region. Light leaks to adjacent pixels, such as entering a colored layer, and this causes a color shift of the display image depending on the viewing direction. This is because the light emitted from the organic EL element has no directivity and has a problem of poor viewing angle characteristics.

On the other hand, for example, as shown in Patent Document 1, by adopting a configuration in which a colored layer is formed on the organic EL element, the distance in the thickness direction of the organic EL element and the colored layer is reduced and the substrate is separated from the substrate. It has been studied to suppress light leakage by reducing light traveling in an oblique direction.
However, in recent years, along with the demand for higher definition and higher quality of displays, reduction of pixel size and reduction of line width of light shielding layer have been promoted, and thus light leakage to adjacent pixels as described above has occurred. Even if the organic EL display device has the above-described configuration, there are cases where it is difficult to sufficiently cope with it.
Therefore, in an organic EL display device, there is a demand for a design that more effectively suppresses color shift of a display image due to light leakage to adjacent pixels.

JP 2012-28058 A

As a result of intensive studies in view of the above circumstances, the present inventors have determined that light that is effective for display traveling from one pixel region to another adjacent pixel region out of the light from the organic EL element is shielded. By adjusting the width of the layer or the shape of the colored layer and the width between the colored layers, it is found that the color shift of the display image due to light leakage to the adjacent pixels can be suppressed, and the present invention is completed. It came to.
An object of the present invention is to provide an organic EL display device capable of suppressing a color shift of a display image due to light leakage to an adjacent pixel, and a manufacturing method thereof.

  In order to achieve the above object, the present invention provides a substrate, an organic EL element formed on the substrate and disposed in a pixel region, and an insulating layer disposed on the substrate and disposed between the pixel regions. An organic EL display device comprising: a plurality of colored layers formed on the organic EL element and disposed in the pixel region; and a light shielding layer formed on the insulating layer and defining pixels. Provided is an organic EL display device characterized in that the width of the first pixel region is such that light effective for display from the organic EL element in one pixel region does not pass through the colored layer in another adjacent pixel region To do.

  According to the present invention, since the width of the light shielding layer is the above-described width, an organic EL display device capable of suppressing color shift of a display image due to light leakage to adjacent pixels can be provided.

  The present invention provides a substrate, an organic EL element formed on the substrate and disposed in a pixel region, an insulating layer formed on the substrate and disposed between the pixel regions, and formed on the organic EL element. And an organic EL display device having a plurality of colored layers arranged in the pixel region, wherein a shape of the colored layer and a width between the colored layers is different from that of the organic EL element in the one pixel region. There is provided an organic EL display device having a shape and a width that do not transmit light that is effective for display in the other pixel region adjacent to the colored layer.

  According to the present invention, when the shape of the colored layer and the width between the colored layers are the shape and width described above, the organic color that can suppress the color shift of the display image due to light leakage to the adjacent pixels. An EL display device can be obtained.

  The present invention provides a substrate, an organic EL element formed on the substrate and disposed in a pixel region, an insulating layer formed on the substrate and disposed between the pixel regions, and formed on the organic EL element. An organic EL display device manufacturing method for manufacturing an organic EL display device having a plurality of colored layers arranged in the pixel region and a light shielding layer formed on the insulating layer to demarcate a pixel, The width of the light shielding layer is adjusted so that light effective for display from the organic EL element in one pixel region does not pass through the colored layer in the other adjacent pixel region, and the light shielding layer is adjusted. There is provided a method for manufacturing an organic EL display device comprising a light shielding layer forming step.

  According to the present invention, it is possible to manufacture an organic EL display device that can suppress color shift of a display image due to light leakage to adjacent pixels by including a light shielding layer forming step.

  The present invention provides a substrate, an organic EL element formed on the substrate and disposed in a pixel region, an insulating layer formed on the substrate and disposed between the pixel regions, and formed on the organic EL element. And a method of manufacturing an organic EL display device having a plurality of colored layers arranged in the pixel region, wherein the shape of the colored layer and the width between the colored layers is the organic of the one pixel region. It has a colored layer forming step of adjusting the shape and width so that light effective for display from an EL element does not pass through the colored layer of the other adjacent pixel region to form the colored layer. An organic EL display device manufacturing method is provided.

  According to the present invention, it is possible to manufacture an organic EL display device that can suppress a color shift of a display image due to light leakage to adjacent pixels by including a colored layer forming step.

  The organic EL display device of the present invention has an effect that it is possible to suppress color shift of a display image due to light leakage to adjacent pixels.

It is a schematic sectional drawing which shows an example of the organic electroluminescent display apparatus of this invention. It is a schematic sectional drawing which shows the other example of the organic electroluminescent display apparatus of this invention. It is a schematic sectional drawing which shows the other example of the organic electroluminescent display apparatus of this invention. It is a schematic sectional drawing which shows the other example of the organic electroluminescent display apparatus of this invention. It is a schematic sectional drawing which shows the other example of the organic electroluminescent display apparatus of this invention. It is explanatory drawing explaining "light effective for a display" in an organic EL element. It is a graph which shows the luminance distribution of the light discharge | released from an organic EL element. It is a schematic sectional drawing which shows the other example of the organic electroluminescent display apparatus of this invention. It is a schematic sectional drawing which shows the other example of the organic electroluminescent display apparatus of this invention. It is a process which shows an example of the manufacturing method of the organic electroluminescent display apparatus of this invention. It is a process which shows the other example of the manufacturing method of the organic electroluminescent display apparatus of this invention. It is a schematic sectional drawing which shows an example of the conventional organic EL display apparatus. It is a schematic sectional drawing which shows the other example of the conventional organic EL display apparatus. It is a schematic sectional drawing which shows the other example of the conventional organic EL display apparatus.

  Hereinafter, the organic EL display device of the present invention and the method for manufacturing the organic EL display device will be described.

A. Organic EL Display Device The organic EL display device of the present invention has two aspects. Hereinafter, each aspect will be described.

I. First aspect An organic EL display device according to the present aspect includes a substrate, an organic EL element formed on the substrate and disposed in a pixel region, and an insulating layer formed on the substrate and disposed between the pixel regions. A plurality of colored layers formed on the organic EL element and disposed in the pixel region; and a light shielding layer that is formed on the insulating layer and demarcates a pixel, and the width of the light shielding layer is The light effective for display from the organic EL element in one of the pixel regions has a width that does not transmit the colored layer in the other pixel region adjacent thereto.
The details of “light effective for display” will be described later.

The organic EL display device of this embodiment will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing an example of the organic EL display device of this embodiment. As shown in FIG. 1, the organic EL display device 10 according to this aspect includes a substrate 1, an organic EL element 2 formed on the substrate 1 and disposed in the pixel region 9, and a pixel region 9 formed on the substrate 1. An insulating layer 3 disposed between them, a colored layer 4 of a plurality of colors including a red colored layer 4R, a green colored layer 4G, and a blue colored layer 4B formed on the organic EL element 2 and disposed in the pixel region 9; And a light shielding layer 5 which is formed on the layer 3 and defines the pixel P. The organic EL display device 10 usually has a barrier layer 6 formed so as to cover the organic EL element 2 and the insulating layer 3, and the colored layer 4 and the light shielding layer 5 are formed on the barrier layer 6. The organic EL element 2 includes, for example, a back electrode layer 21 formed in a pattern on the pixel region 9 on the substrate 1, an organic EL layer 22 formed on the back electrode layer 21 and having at least a light emitting layer, and an organic EL And a transparent electrode layer 23 formed on the layer 22. Further, the organic EL display device 10 may have the counter substrate 8, and the substrate 1 and the counter substrate 8 may be bonded together using the adhesive layer 7. FIG. 1 shows an example in which the light shielding layer 5 is formed between the pixel regions 9 on the barrier layer 6 and the colored layers 4 of different colors are formed on the light shielding layer 5 without any gaps.
In this embodiment, the width of the light shielding layer 5 is such that light effective for display from the organic EL element 2 in one pixel region 9a does not pass through the colored layer 4G in the other adjacent pixel region 9b. Features. FIG. 1 shows an example in which the width of the light shielding layer 5 is adjusted so that the width of the light shielding layer 5 overlaps the traveling direction of the light L _min having the lowest effective angle in the organic EL element 2. Details of the light L _min having the lowest effective angle will be described later.

2-5 is a schematic sectional drawing shown about the other example of the organic electroluminescence display of this aspect. FIG. 2 shows an example in which the light shielding layer 5 is formed between the pixel regions 9 on the barrier layer 6 and the colored layers 4 of different colors are formed on the light shielding layer 5 with a gap. FIG. 3 shows an example in which the colored layers 4 of different colors are formed between the pixel regions 9 on the barrier layer 6 without any gap, and the light shielding layer 5 is formed on the colored layer 4. 4 and 5, the colored layers 4 of different colors are formed between the pixel regions 9 on the barrier layer 6 with a gap, and the light shielding layer covers the gap and at least a part of the colored layer 4. An example in which 5 is formed is shown. Further, FIG. 4 shows an example in which the light shielding layer 5 is formed along the dent generated by the gap. In FIG. 5, the light shielding layer 5 is formed by filling the dent generated by the gap. An example is shown.
The reference numerals not described in FIGS. 2 to 5 are the same as the reference numerals described in FIG. 1, and thus the description thereof is omitted here.

Here, the “pixel” is a minimum unit constituting an image. For example, when one pixel is composed of three subpixels of red, green, and blue, in this specification, one subpixel is referred to as a “pixel”. Specifically, as shown in FIG. 1, the organic EL display device 10 has a colored layer 4 composed of a red colored layer 4R, a green colored layer 4G, and a blue colored layer 4B, and is defined by the light shielding layer 3. A plurality of pixels P are provided.
“Pixel area” refers to an area in which one pixel is arranged. For example, when one pixel is composed of three subpixels of red, green, and blue, an area in which one subpixel is arranged is referred to as a “pixel area”. Specifically, as shown in FIG. 1, the organic EL display device 10 has a colored layer 4 composed of a red colored layer 4R, a green colored layer 4G, and a blue colored layer 4B, and is defined by the light shielding layer 3. A plurality of pixel regions 9 in which the pixels P are arranged are provided.

  According to this aspect, since the width of the light shielding layer has the above-described width, an organic EL display device capable of suppressing color shift of a display image due to light leakage to adjacent pixels can be provided.

The reason for this will be briefly described.
First, in a conventional organic EL display device, it has been considered that a color shift of a display image due to light leakage to an adjacent pixel can be suppressed by forming a colored layer on an organic EL element. This is because a general organic EL element is designed as follows. That is, the organic EL element of a general organic EL display device is designed so that most of the light travels in a direction perpendicular to the substrate and a part of the light travels in an oblique direction with respect to the substrate. Yes. The light traveling in an oblique direction with respect to the substrate is designed so as to decrease as it approaches the horizontal direction with respect to the substrate. Therefore, by shortening the distance in the thickness direction between the organic EL element and the colored layer, the amount of light traveling in an oblique direction with respect to the substrate can be reduced, and a display image caused by light leakage to adjacent pixels can be reduced. It was thought that color shift could be suppressed.
However, when the pixel size and the width between the pixels are reduced with the recent increase in the resolution of the display, the above-described configuration can sufficiently suppress the color shift of the display image due to light leakage to the adjacent pixels. There are cases where it is difficult.

As shown in FIG. 12, in the conventional organic EL display device 100, most of the light effective for display from the organic EL elements in one pixel region 9a is applied to the colored layer 4R in one pixel region as light L11. To Penetrate. Some of the light travels in an oblique direction with respect to the substrate 1 like the lights L12 to L14. More specifically, a part of the light is directly incident and transmitted to the colored layer 4G in the other adjacent pixel region 9b like the light L12. Some of the light passes through the colored layer 4R in one pixel region like the light L13, and further passes through the colored layer 4G in another adjacent pixel region. A part of the light is absorbed by the light shielding layer 5 like the light L14. Conventionally, when the light shielding layer 5 is disposed, the width of the light shielding layer 5 is equal to the width of the light shielding layer 5 mainly for the purpose of not observing TFT elements and the like formed on the substrate 1 and improving the contrast between pixels. Since the relationship with the light effective for display proceeding from the pixel region to another adjacent pixel region has not been sufficiently studied, the light L12 and the light L13 are observed when viewed from an oblique direction. There was a color shift of the display image.
FIG. 12 is a schematic cross-sectional view showing an example of a conventional organic EL display device, and reference numerals that are not described are the same as those described in FIG.

On the other hand, in the organic EL display device of this aspect, the width of the light shielding layer is adjusted with reference to light effective for display traveling from one pixel region to another adjacent pixel region. As shown, the light shielding layer 5 can be arranged at a position where the light L2 corresponding to the light L12 and the light L3 corresponding to the light L13 can be absorbed.
Therefore, an organic EL display device capable of suppressing color shift of a display image due to light leakage to adjacent pixels can be obtained.
The lights L1 and L4 in FIG. 1 correspond to the lights L11 and L14 in FIG. 12, respectively.

  Hereinafter, the details of the organic EL display device of this embodiment will be described.

1. Light Effective for Display In this specification, “light effective for display” means that light from an organic EL element in one pixel region passes through a colored layer in another pixel region and affects a display image. Say light.
More specifically, “light that is effective for display” is light when the intensity of light that travels in the direction perpendicular to the substrate out of the light from the organic EL elements in one pixel region is 1. The light having an intensity ratio of 0.2 or more is preferred, and light having an intensity ratio of 0.3 or more, particularly 0.5 or more is preferred.
The organic EL element was made to emit light, and the intensity of light was evaluated visually and with a luminance meter from the direction perpendicular to the substrate. At that time, the voltage was lowered from a predetermined voltage condition (assumed to be condition 1). In this case, the intensity (luminance) ratio of light when visually felt sufficiently dark (condition 2) was 0.2. Therefore, in this embodiment, the light intensity ratio effective for display is set to 0.2 or more when the light traveling in the vertical direction is 1.

The light intensity ratio described above is usually determined by the angle between the light traveling direction and the vertical direction of the substrate.
In the following description, the angle formed between the vertical direction of the substrate and the light traveling direction that is the minimum value of the intensity ratio is referred to as a “lowest effective angle”, and the light having the minimum value of the intensity ratio is referred to as “having the lowest effective angle. It may be referred to as “light”.

“Light effective for display” in this embodiment will be described with reference to the drawings.
FIG. 6 is an explanatory view for explaining “light effective for display” in the organic EL element.
As shown in FIG. 6, “light that is effective for display” refers to light X in which the intensity ratio with respect to the light L ₉₀ traveling in the direction perpendicular to the substrate 1 in the organic EL element 2 is in the above-described range. Further, the “minimum effective angle” refers to an angle θ formed by the vertical direction W ₉₀ of the substrate 1 and the traveling direction W _min of the light L _min where the intensity ratio with respect to the light L ₉₀ is the minimum value in the above-described range. “Light having the lowest effective angle” refers to L _min .

  The above-mentioned minimum effective angle is appropriately determined according to the material and form of the organic EL element used in the organic EL display device, and is not particularly limited, but is 60 ° or less, particularly 50 ° or less, particularly 40 ° or less. Preferably there is.

The light intensity ratio and the minimum effective angle in this embodiment are values obtained by the following measurement method.
The luminance distribution of light emitted from the organic EL element was measured using EZ Contrast 160R manufactured by ELDIM, and luminance distribution data as shown in FIG. 7 was obtained. FIG. 7 is a graph showing the luminance distribution data of the organic EL element. The horizontal axis of the graph is the elevation angle with respect to the perpendicular extending from the substrate (the direction perpendicular to the substrate is 0 °), and the vertical axis is the luminance value. is there. The obtained brightness distribution data was normalized to the maximum value, and the light angle at which the intensity ratio was 0.2 was determined when the intensity of light traveling in the direction perpendicular to the substrate was 1.

2. Light-shielding layer The light-shielding layer in this embodiment is formed on the insulating layer to define pixels, and is formed in a predetermined pattern.
Here, “the light shielding layer is formed on the insulating layer” means that the light shielding layer is formed so as to overlap at least the insulating layer in plan view, and the light shielding layer is formed directly on the insulating layer. In addition, the light shielding layer is formed on the insulating layer via another layer.

(1) Width of light shielding layer In this embodiment, the width of the light shielding layer is such that light effective for display from the organic EL element in one pixel region is transmitted through the colored layer in the other pixel region. It is the width which is not.
“The width of the light-shielding layer is a width that does not allow light effective for display from the organic EL element in one pixel region to pass through the colored layer in another adjacent pixel region”. The width is adjusted so as to be able to absorb light effective for display that proceeds from the organic EL element in the pixel region to the other adjacent pixel region. Moreover, in this aspect, the width | variety of the light shielding layer arrange | positioned at least between the colored layers of a different color has the above-mentioned width | variety. Further, the width of the light shielding layer refers to the width at the portion in contact with the lower layer of the light shielding layer.
Hereinafter, a method for adjusting the width of the light shielding layer will be described.

  In this aspect, among the light effective for display from the organic EL elements in one pixel region, the light shielding layer can absorb the light effective for display that directly enters the colored layer in the other adjacent pixel region. Thus, it is preferable to adjust the width of the light shielding layer. Here, as shown in FIG. 12, since the light L13 is transmitted through the colored layer 4R and the colored layer 4G, most of the light L13 is absorbed from the transmittance characteristics of the colored layer 4R and the colored layer 4G. On the other hand, since the light L12 is transmitted only through the colored layer 4G, light that should not be emitted is emitted with the transmittance characteristics of the colored layer 4G. For this reason, the color L of the display image is particularly affected by the light L12 when viewed from an oblique direction.

  The light shielding layer so that the light shielding layer can absorb the light effective for display directly incident on the colored layer of the other adjacent pixel region out of the light effective for display from the organic EL element in one pixel region. As a method for adjusting the width of the light-shielding layer, for example, a method of adjusting the width of the light shielding layer so as to overlap with the traveling direction of light having the lowest effective angle in the organic EL element in one pixel region can be suitably used.

In such a method for adjusting the width of the light shielding layer, for example, as shown in FIGS. 1 to 2 and FIGS. 4 to 5, the colored layer 4 and the light shielding layer 5 are formed on the same plane in the organic EL display device 10. In such a case, the width of the light shielding layer 5 is arranged such that the light shielding layer 5 is disposed at a position where the light L _min having the lowest effective angle in the organic EL element 2 in one pixel region 9a is directly absorbed by the light shielding layer 5. Adjust.
For example, as shown in FIG. 3, when the light shielding layer 5 is formed on the colored layer 4 in the organic EL display device 10, in the organic EL element 2 in one pixel region 9 a, another adjacent pixel region. The width of the light shielding layer 5 is adjusted such that the light shielding layer is disposed at a position where the light L _min having the lowest effective angle incident on the colored layer 4G of 9b is absorbed by the light shielding layer 5.

  In addition, since the light shielding layer usually has a function of preventing the TFT element or the like formed on the substrate from being observed, the width of the light shielding layer is equal to or larger than the width of the insulating layer. Is done. In this embodiment, it is preferable that the width of the light shielding layer is greater than the width of the insulating layer. This is because, in the manufacturing process of the organic EL display device, it is easy to form the insulating layer and the light shielding layer so as to overlap in plan view.

  Further, the width of the light shielding layer can be obtained by calculating by the trigonometric theorem from the light of the lowest effective angle in the organic EL element in one pixel region and the interval between the organic EL element and the colored layer. The width of the light shielding layer is adjusted by observing or simulating an actual form in a cross section perpendicular to the substrate in the organic EL display device.

  The specific width of the light shielding layer is appropriately determined according to the material, shape, arrangement, and the like of the organic EL element, and is not particularly limited.

(2) Light-shielding layer The shape of the opening of the light-shielding layer is not particularly limited. For example, the shape of the colored layer may be a stripe shape, a dogleg shape, a delta arrangement, a triangle arrangement, a four-pixel arrangement type, or the like. The shape etc. which respond | corresponded can be mentioned.

As the light shielding layer, for example, a material in which a black color material is dispersed in a binder resin is used.
Examples of the black color material include those generally used for a light shielding layer of a color filter, and both pigments and dyes can be used. Examples thereof include carbon black and titanium black.
The binder resin is appropriately selected according to the method for forming the light shielding layer. In the case of the photolithography method, as the binder resin, for example, a photosensitive resin having a reactive vinyl group such as acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber is used. In the case of a printing method or an inkjet method, examples of the binder resin include polymethyl methacrylate resin, polyacrylate resin, polycarbonate resin, polyvinyl alcohol resin, polyvinyl pyrrolidone resin, hydroxyethyl cellulose resin, carboxymethyl cellulose resin, polyvinyl chloride resin, Examples include melamine resin, phenol resin, alkyd resin, epoxy resin, polyurethane resin, polyester resin, maleic acid resin, polyamide resin and the like.

  Moreover, the light shielding layer may contain a photopolymerization initiator, a sensitizer, a coating property improver, a development improver, a crosslinking agent, a polymerization inhibitor, a plasticizer, a flame retardant, and the like as necessary.

  The optical density of the light shielding layer is, for example, 2.0 or more, more preferably 4.0 or more.

  The film thickness of the light shielding layer can be the same as the film thickness of a general light shielding layer in the color filter, and can be set within a range of 0.5 μm to 2.0 μm, for example.

  The method for forming the light shielding layer is not particularly limited as long as the light shielding layer can be formed in a pattern on the barrier layer, and examples thereof include a photolithography method, a printing method, and an ink jet method. it can.

(3) Second light shielding layer In this embodiment, when the colored layer 4 is formed on the light shielding layer 5, the second light shielding layer 52 is further formed on the light shielding layer 5, as shown in FIG. May be. By the second light shielding layer, not only the light effective for direct incidence from the organic EL element in one pixel region to the colored layer in another adjacent pixel region, but also through the colored layer in one pixel region is adjacent. Light that is effective for display incident on the colored layers in other pixel regions can also be absorbed, and the occurrence of color shift in the display image when viewed from an oblique direction can be effectively suppressed.

In the second light shielding layer, the optical density of the second light shielding layer is preferably lower than the optical density of the light shielding layer. More specifically, the optical density of the second light-shielding layer is preferably in the range of 0.5 to 1.5, and more preferably in the range of 0.7 to 1.3. Here, when the second light shielding layer is formed by photolithography, an alignment mark for alignment is usually formed on the substrate in advance. If the optical density of the second light-shielding layer is too high, it may be difficult to detect alignment marks when patterning the second light-shielding layer, making alignment difficult. Further, if the optical density of the second light shielding layer is too low, it may be difficult to prevent light leakage from adjacent pixels. Even when the optical density of the second light-shielding layer is high, it is possible to detect the alignment mark by adjusting the intensity of light irradiated when detecting the alignment mark.
Here, for example, the optical density can be measured by a spectrocolorimeter, and the optical density can be calculated from the Y value of the spectrum. As the spectrocolorimeter, a spectrocolorimeter manufactured by OLYMPUS Co., Ltd. can be used.

When the second light-shielding layer is included, the average transmittance in the visible light region of the second light-shielding layer is specifically preferably in the range of 5% to 25%, and more preferably 10% to 25%. It is preferable to be within the range. When the second light-shielding layer is formed by photolithography, if the average transmittance of the second light-shielding layer is too low, the alignment mark is difficult to detect when the second light-shielding layer is patterned. May be difficult. Further, if the average transmittance of the second light shielding layer is too high, it may be difficult to prevent light leakage from adjacent pixels. Even when the average transmittance of the second light-shielding layer is low, it is possible to detect the alignment mark by adjusting the intensity of light irradiated when detecting the alignment mark.
Here, the “visible light region” refers to a wavelength range of 400 nm to 700 nm.
As a method for measuring the transmittance, a method of measuring the transmittance of the second light shielding layer using the transmittance of the sample substrate (transparent substrate) as a reference (100%) can be employed. As the apparatus, an ultraviolet / visible spectrophotometer (for example, Hitachi U-4000) or an apparatus having a photodiode array as a detector (for example, Otsuka Electronics MCPD) can be used. The maximum transmittance and the minimum transmittance in the visible light region are the maximum value and the minimum value among the transmittances in the wavelength range of 400 nm to 700 nm, and the average transmittance in the visible light region is in the wavelength range of 400 nm to 700 nm. It is a value obtained by averaging the transmittance.

In the case where two light shielding layers are formed, the method for adjusting the width of the second light shielding layer is not particularly limited as long as the second light shielding layer is disposed on the light shielding layer. A method of adjusting the width of the second light shielding layer so as to overlap with the traveling direction of light having the lowest effective angle in the organic EL element in one pixel region can be mentioned. More specifically, the second light-shielding layer is disposed at a position capable of absorbing light having the lowest effective angle that passes through the colored layer of one pixel region and further passes through the colored layer of another adjacent pixel region. As described above, it is preferable to adjust the width of the second light shielding layer.
Further, the width of the second light shielding layer is not particularly limited as long as the second light shielding layer is disposed on the light shielding layer, and may be the same as the width of the light shielding layer. May be smaller or larger than the width of the light shielding layer. Among them, the width of the second light-shielding layer is preferably the same as the width of the light-shielding layer, or the width of the second light-shielding layer is preferably larger than the width of the light-shielding layer. It is preferable that it is larger than the width. When the width of the second light-shielding layer is larger than the width of the light-shielding layer 3, the second light-shielding layer is effective for direct incidence from the organic EL element in one pixel region to the colored layer in another adjacent pixel region. Can absorb not only light but also light that is effective for display that passes through the colored layer of one pixel region and enters the colored layer of another adjacent pixel region. The occurrence of color misregistration can be effectively suppressed. Further, alignment can be easily performed when the second light shielding layer is disposed on the light shielding layer. In general, since the second light shielding layer has an optical density lower than that of the light shielding layer, the aperture ratio is not greatly reduced even if the width is large. In addition, the light shielding layer is effective for displaying light that is effective for display from the organic EL element in one pixel region and is incident on the color layer in another adjacent pixel region through the colored layer in one pixel region. Since most of the light can be absorbed, the width of the light shielding layer may be smaller than the width of the second light shielding layer.

  The material, thickness, formation method, and the like used for the second light shielding layer can be the same as those described for the light shielding layer described above, and thus description thereof is omitted here.

3. Colored layer The colored layer in this embodiment is formed in a pattern on the organic EL element and has a plurality of colored layers.

  The colored layer has, for example, three colored layers of red, green, and blue. The color of the colored layer may be any color as long as it contains at least three colors of red, green, and blue. For example, three colors of red, green, and blue, red, green, blue, yellow, red, green, blue, and white Or five colors such as red, green, blue, yellow, and cyan. In the case of four colors of red, green, blue and white, a colored layer of three colors of red, green and blue and a white layer which will be described later are used.

The colored layer is, for example, a color material dispersed in a binder resin.
Examples of the color material include pigments and dyes of each color. Examples of the color material used for the red colored layer include perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments, anthracene pigments, and isoindoline pigments. Examples of the color material used in the green coloring layer include phthalocyanine pigments such as halogen polysubstituted phthalocyanine pigments or halogen polysubstituted copper phthalocyanine pigments, triphenylmethane basic dyes, isoindoline pigments, and isoindolinone pigments. And pigments. Examples of the color material used in the blue colored layer include copper phthalocyanine pigments, anthraquinone pigments, indanthrene pigments, indophenol pigments, cyanine pigments, dioxazine pigments, and the like. These pigments and dyes may be used alone or in combination of two or more.
As the binder resin, for example, a photosensitive resin having a reactive vinyl group such as acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber is used.
The colored layer may contain a photopolymerization initiator and, if necessary, a sensitizer, a coatability improver, a development improver, a crosslinking agent, a polymerization inhibitor, a plasticizer, a flame retardant, and the like.

  The arrangement of the colored layers is not particularly limited, and may be a known arrangement such as a stripe type, a mosaic type, a triangle type, or a four-pixel arrangement type.

  There may or may not be a gap between adjacent colored layers, but it is preferable that there is no gap among them.

  Further, on the same plane on which the colored layer is formed, a white layer that does not contain the color material, contains the binder resin, and transmits light effective for display from the organic EL element is formed. Also good. For example, when a red colored layer, a green colored layer, a blue colored layer, and a white layer are formed, at least one pixel out of three colors of red, green, and blue is not lit during display. The light leaks easily. On the other hand, in this aspect, since light leakage to the adjacent pixels can be suppressed, it is particularly useful when a white layer is formed.

The film thickness of the colored layer can be the same as the film thickness of a general colored layer in a color filter, and can be set, for example, within a range of 1 μm to 5 μm.
As a method for forming the colored layer, any method can be used as long as a plurality of colored layers can be arranged on the same plane, and examples thereof include a photolithography method, an inkjet method, and a printing method.
The thickness and formation method of the white layer are the same as those of the colored layer.

4). Substrate The substrate in this embodiment supports the organic EL element.
In this embodiment, in order to extract light from the colored layer side of the organic EL display device, the substrate may be transparent or opaque. As the substrate, those generally used in organic EL display devices can be used, for example, non-flexible inorganic substrates such as British glass, Pyrex (registered trademark) glass, synthetic quartz plate, and the like, Examples thereof include a resin substrate having flexibility such as a resin film and an optical resin plate. Among them, it is preferable to use an inorganic substrate, and it is preferable to use a glass substrate among inorganic substrates. Furthermore, it is preferable to use an alkali-free type glass substrate among the glass substrates. This is because the alkali-free type glass substrate is excellent in dimensional stability and workability in high-temperature heat treatment, and does not contain an alkali component in the glass, and thus can be suitably used for the substrate.

5. Organic EL Element The organic EL element in the present embodiment is an element in which an organic EL layer including a light emitting layer is formed between an anode and a cathode. For example, a back electrode layer formed in a pattern on a substrate, and a back electrode The insulating layer formed in the opening of the layer, the organic EL layer formed on the back electrode layer and including the light emitting layer, and the transparent electrode layer formed on the organic EL layer can be included.
The organic EL element may emit white light or may emit each color such as red, green, and blue, but preferably emits white light. Since the white light emission type organic EL display device is likely to cause a color shift of a display image due to light leakage to an adjacent pixel, the configuration of this aspect is useful.
Hereinafter, each structure in an organic EL element is demonstrated.

(1) Organic EL layer The organic EL layer has one or more organic layers including at least a light emitting layer. Examples of the organic layer constituting the organic EL layer other than the light emitting layer include a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer. The hole transport layer is often integrated with the hole injection layer by adding a hole transport function to the hole injection layer. In addition, as an organic layer constituting the organic EL layer, holes or electrons such as a hole blocking layer and an electron blocking layer are prevented from penetrating, and further, exciton diffusion is prevented and excitons are placed in the light emitting layer. By confining, a layer for increasing the recombination efficiency can be cited. The configuration of the organic EL layer may be a general configuration, in which only the light-emitting layer, the structure in which the hole injection layer and the light-emitting layer are stacked in this order, the hole injection layer, the light-emitting layer, and the electron injection layer are stacked in this order. The structure in which the hole injection layer, the hole blocking layer, the light emitting layer, and the electron injection layer are stacked in this order, the structure in which the hole injection layer, the light emitting layer, and the electron transport layer are stacked in this order can be exemplified. .

  The light emitting layer may be a white light emitting layer and may have a plurality of color light emitting layers, but is preferably a white light emitting layer. As described above, since the white light emission type organic EL display device is likely to cause a color shift of a display image due to light leakage to adjacent pixels, the configuration of this aspect is useful. The light emitting material used for the white light emitting layer is hardly composed of a single compound, and generally light emitting materials having two to three colors are used. In this case, the emission spectrum of the white light-emitting layer is a combination of the spectra of the light-emitting materials of the respective colors.

  About the material of each layer which comprises an organic EL layer, a formation method, etc., it can be made to be the same as that of a general organic EL element.

(2) Transparent electrode layer and back electrode layer The transparent electrode layer and the back electrode layer are provided to apply a voltage to the light emitting layer and cause light emission in the light emitting layer. One is an anode and the other is a cathode. is there. The back electrode layer is formed between the substrate and the organic EL layer, and the transparent electrode layer is formed on the organic EL layer.
About a material, a formation method, etc. of a transparent electrode layer and a back electrode layer, it can be made to be the same as that of a general organic EL element.

6). Insulating layer The insulating layer in this embodiment is formed on the substrate and is disposed between the pixel regions. The insulating layer is usually formed in the opening of the back electrode layer formed in a pattern in the pixel region on the substrate, and is conducted between adjacent back electrode layers, or is conducted between the transparent electrode layer and the back electrode layer. It is formed in order to prevent As a material of the insulating layer, a material of a general insulating layer in an organic EL display device can be used. For example, a photo-curable resin such as a photosensitive polyimide resin or an acrylic resin, a thermosetting resin, an inorganic material, or the like. Can be mentioned.

  The thickness of the insulating layer is not particularly limited as long as it defines a pixel and can insulate between the adjacent back electrode layer and between the transparent electrode layer and the back electrode layer. For example, it is preferably within a range of 0.3 μm to 100 μm, more preferably within a range of 0.5 μm to 50 μm, and particularly preferably within a range of 1 μm to 20 μm.

  The method for forming the insulating layer is not particularly limited as long as the insulating layer can be formed in a pattern on the substrate, and examples thereof include a printing method and a photolithography method.

7). Other Configurations The organic EL display device of this embodiment is not particularly limited as long as it has the above-described configuration, and other configurations can be appropriately selected and added as necessary.
Hereinafter, such a configuration will be described.

(1) Barrier Layer In the organic EL display device of this embodiment, it is preferable that the barrier layer 6 is formed so as to cover the organic EL element 2 and the insulating layer 3 as shown in FIG. This is because deterioration of the organic EL element due to oxygen, water vapor, etc. in the atmosphere can be suppressed. The barrier layer can be the same as that used in general organic EL display devices. For example, an inorganic oxide such as silicon oxide, silicon nitride, silicon carbide, aluminum oxide, and titanium oxide is sputtered or vacuumed. Examples thereof include those formed by physical vapor deposition such as vapor deposition.

(2) Refractive Index Adjustment Layer When the organic EL display device of this embodiment has a barrier layer, it may have a refractive index adjustment layer on the barrier layer. This is because the interface reflection due to the difference in refractive index between the organic EL element and the colored layer can be suppressed and the light extraction efficiency can be improved.
Since the specific refractive index adjustment layer can be the same as that used in a general organic EL display device, the description thereof is omitted here.

(3) Opposing Substrate The organic EL display device of this aspect usually has a counter substrate 8 as shown in FIG. The counter substrate is disposed to protect the light shielding layer, the colored layer, the organic EL element, the insulating layer, and the like in the organic EL display device. Since it is disposed on the surface on which the color filter of the organic EL display device is formed, it usually has transparency.
Although it does not specifically limit as transparency of a counter substrate, For example, it is preferable that the total light transmittance of a counter substrate is 80% or more, and it is more preferable that it is 90% or more. In addition, let the total light transmittance of a transparent base material be the value (total light) measured by the method prescribed | regulated by JISK7105.

  A specific counter substrate can be the same as that used for the substrate, and thus description thereof is omitted here.

  A board | substrate and a counter substrate are bonded together and arrange | positioned through an adhesive layer, for example. Since the adhesive layer can be the same as that used in a general organic EL display device, the description thereof is omitted here.

(4) TFT element In the organic EL display device of this embodiment, a TFT element is usually formed on a substrate. Since the TFT element can be the same as that used in a general organic EL display device, description thereof is omitted here.

8). Manufacturing method of organic EL display device The manufacturing method of the organic EL display device according to this aspect is not particularly limited, and for example, the method described in the section “B. Manufacturing method of organic EL display device” described later is preferably used. be able to.

9. Applications The organic EL display device according to this aspect is suitable for high-definition displays. For example, it can be used for mobile electronic devices such as mobile notebook computers and multifunction terminal devices (also referred to as high-function terminal devices). It is done.

II. Second Aspect The organic EL display device according to the present aspect includes a substrate, an organic EL element formed on the substrate and disposed in a pixel region, and an insulating layer formed on the substrate and disposed between the pixel regions. A plurality of colored layers formed on the organic EL element and disposed in the pixel region, wherein the shape of the colored layer and the width between the colored layers is equal to that of the one pixel region. The shape and width are such that light effective for display from the organic EL element does not pass through the colored layer of the other adjacent pixel region.

The organic EL display device of this embodiment will be described with reference to the drawings.
FIG. 9 is a schematic cross-sectional view showing an example of the organic EL display device of this embodiment. As shown in FIG. 9, the organic EL display device 10 of this aspect includes a substrate 1, an organic EL element 2 formed on the substrate 1 and disposed in the pixel region 9, and a pixel region 9 formed on the substrate 1. And an insulating layer 3 disposed therebetween, and a plurality of colored layers 4 including a red colored layer 4R, a green colored layer 4G, and a blue colored layer 4B formed on the organic EL element 2 and disposed in the pixel region 9 .
In the present embodiment, the shape of the colored layer 4 and the width between the colored layers 4 are such that the light effective for display from the organic EL element 2 in the one pixel region 9a is adjacent to the colored layer in the pixel region 9b. 4 is a shape and a width that does not pass through. FIG. 9 shows an example in which the shape of the colored layer 4 and the width between the colored layers 4 are adjusted so as not to overlap the traveling direction of the light L _min having the lowest effective angle in the organic EL element 2. .
Note that the reference numerals not described in FIG. 9 are the same as the reference numerals described in FIG.

  According to this aspect, the organic EL display device capable of suppressing the color shift of the display image due to the light leakage to the adjacent pixels by having the shape of the colored layer and the interval between the colored layers as described above. It can be.

The reason for this will be briefly described.
First, in the conventional organic EL display device, when there is no light-shielding layer, the shape of the colored layer is mainly from the viewpoint of ease of production, for example, as shown in FIG. In the case where a part of each other is stacked between the pixel regions 9 or, for example, from the viewpoint of improving the luminance of the organic EL display device 100, the width of the organic EL element 2 in the pixel region 9 is set as shown in FIG. In addition, a width between the colored layers 4 was provided. However, in the conventional organic EL display device, the relationship between the shape of the colored layer and the width between the colored layers and the light effective for display traveling from one pixel region to another adjacent pixel region is sufficiently studied. Therefore, for example, in the light effective for display from the organic EL element in one pixel region 9a, as shown in FIGS. 13 and 14, a part of other pixel regions adjacent to each other as shown in the light L12. Directly incident on and transmitted through the colored layer 4G of 9b, or a part of the colored layer 4R in one pixel region 9a and the colored layer 4G in another adjacent pixel region 9b as shown in FIG. When the light L12 and the light L13 are observed when viewed through and viewed from an oblique direction, a color shift of the display image occurs.
FIGS. 13 and 14 are schematic cross-sectional views showing an example of a conventional organic EL display device. Reference numerals that are not described can be the same as those described in FIG. Omitted.

On the other hand, in the organic EL display device according to this aspect, the shape of the colored layer and the width between the colored layers are adjusted with reference to light effective for display traveling from one pixel region to another adjacent pixel region. Therefore, as shown in FIG. 9, the shape of the colored layer can be adjusted so as not to contact the light L2 corresponding to the light L12. Further, light corresponding to the light L13 can be prevented from being generated.
Therefore, an organic EL display device capable of suppressing color shift of a display image due to light leakage to adjacent pixels can be obtained.

Hereinafter, the details of the organic EL display device of this embodiment will be described.
Note that the light, substrate, organic EL element, insulating layer, other configurations, applications, and the like that are effective for display in this aspect may be the same as those described in the section “I. First aspect” described above. Since it can do, description here is abbreviate | omitted.

1. Colored layer The colored layer in this embodiment is formed on the organic EL element and disposed in the pixel region.
Here, “the colored layer is formed on the organic EL element” means that the colored layer is formed so as to overlap at least the insulating layer in plan view, and the colored layer is formed directly on the organic EL element. The case where a colored layer is formed on the organic EL element through another layer is included.

(1) Colored layer shape and width between colored layers In this aspect, the colored layer shape is a colored layer in another pixel region adjacent to light effective for display from an organic EL element in one pixel region. It is the shape which does not permeate | transmit. Further, the width between the colored layers is a shape in which light effective for display from the organic EL element in one pixel region does not pass through the colored layers in the other adjacent pixel regions.
“The shape of the colored layer and the width between the colored layers are such that light effective for display from the organic EL element of one pixel region does not pass through the colored layer of another adjacent pixel region” In addition, the shape of the colored layer and the width between the colored layers are widths adjusted so as not to transmit light effective for display proceeding from the organic EL element in one pixel region to the other adjacent pixel region. Say. In this embodiment, at least the width between the colored layers of different colors has the above-described width.
Hereinafter, a method for adjusting the shape of the colored layer and the width between the colored layers will be described.

  In this aspect, out of the light effective for display from the organic EL element in one pixel region, the light effective for display that is directly incident on the colored layer in another adjacent pixel region does not pass through the colored layer. It is preferable to adjust the shape of the colored layer and the width between the colored layers. As described in the section “I. First aspect” described above, the light that is effective for display that directly enters the colored layer of another adjacent pixel region causes a color shift of the display image due to light leakage to the adjacent pixel. This is because the influence of is great.

  Among the light effective for display from the organic EL element in one pixel region, the light directly incident on the colored layer in the other adjacent pixel region is prevented from passing through the colored layer and between the colored layers. As a method for adjusting the width of the colored layer, for example, a method of adjusting the shape of the colored layer and the width between the colored layers so as not to overlap the light traveling direction having the lowest effective angle in the organic EL element of one pixel region. It can be used suitably.

In the above-described method for adjusting the shape of the colored layer and the width between the colored layers, for example, as shown in FIG. 9, the light L _min having the lowest effective angle in the organic EL element 2 in one pixel region 9a is directly colored. The shape of the colored layer and the width between the colored layers are adjusted so that the layer 4G does not enter. As the shape of the colored layer, for example, the thickness, the cross-sectional shape and the like are adjusted.

  The colored layer is usually formed to be equal to or larger than the size of the organic EL element. For this reason, the width between the colored layers is usually formed to be equal to or smaller than the width of the insulating layer, and more preferably to be smaller than the width of the insulating layer. . This is because in the manufacturing process of the organic EL display device, it is easy to form the organic EL element and the colored layer so as to overlap in plan view.

  The specific shape of the colored layer and the width between the colored layers are appropriately determined according to the material, shape, arrangement, and the like of the organic EL element.

(2) Colored layer In this aspect, there is a gap between adjacent colored layers.
Examples of the method for forming the colored layer in a desired shape include a method of adjusting the shape of the colored layer by adjusting exposure conditions, development conditions, firing conditions, and the like when a photolithography method is used. . Further, for example, in the ink jet method, a method of adjusting the preparation, discharge conditions, drying conditions, firing conditions and the like of the composition for the colored layer can be mentioned.

  About a colored layer, since it can be the same as that of the content demonstrated by the term of "I. 1st aspect" except said point, description here is abbreviate | omitted.

2. Manufacturing method of organic EL display device The manufacturing method of the organic EL display device according to this aspect is not particularly limited, and for example, the method described in the section “B. Manufacturing method of organic EL display device” described later is preferably used. be able to.

B. Manufacturing Method of Organic EL Display Device The manufacturing method of the organic EL display device according to this aspect has two aspects. Hereinafter, each aspect will be described.

I. 1st aspect The manufacturing method of the organic electroluminescent display device of this aspect WHEREIN: The organic EL element formed on the said board | substrate and arrange | positioned in the pixel area | region, It was formed on the said board | substrate and arrange | positioned between the said pixel area | regions. Manufacturing for manufacturing an organic EL display device having an insulating layer, a colored layer of a plurality of colors formed on the organic EL element and disposed in the pixel region, and a light-shielding layer formed on the insulating layer and defining pixels In this method, the width of the light-shielding layer is adjusted so that light effective for display from the organic EL element in one pixel region does not pass through the colored layer in another adjacent pixel region. And a light-shielding layer forming step of forming the light-shielding layer.

A method for manufacturing the organic EL display device of this embodiment will be described with reference to the drawings.
10A to 10E are schematic cross-sectional views illustrating an example of a method for manufacturing the organic EL display device according to this embodiment. First, as shown in FIG. 10A, the organic EL element 2 and the insulating layer 4 are formed on the substrate 1, and the barrier layer 6 is formed so as to cover the organic EL element 2 and the insulating layer 3. Next, as shown in FIG. 10B, a light shielding layer composition containing a black color material and a binder resin is applied on the barrier layer 6 to form a light shielding layer forming layer 5 ′. Next, as shown in FIG. 10 (c), the light shielding layer forming layer 5 ′ is irradiated with exposure light L through a photomask M, exposed, and then developed to develop the light shielding layer shown in FIG. 10 (d). 5 is formed (light shielding layer forming step). In this embodiment, the width of the light shielding layer 5 is adjusted so that light effective for display from the organic EL element 2 in one pixel region 9a does not pass through the colored layer 4 in another adjacent pixel region 9b. Thus, the light shielding layer 5 is formed. FIG. _10D shows an example in which the width of the light shielding layer 5 is adjusted so that the width of the light shielding layer 5 overlaps the traveling direction of the light L _min having the lowest effective angle in the organic EL element 2. . In FIG. 10D, next, as shown in FIG. 10E, a colored layer 4 of a plurality of colors is formed in the pixel region on the barrier layer 6 using a photolithography method or the like. Through the above steps, the organic EL display device 10 can be manufactured.

According to this aspect, by including the light shielding layer forming step, it is possible to manufacture an organic EL display device capable of suppressing color shift of a display image due to light leakage to adjacent pixels.
Hereinafter, the detail of the manufacturing method of the organic EL display device of this aspect is demonstrated.

1. Light-shielding layer forming step The light-shielding layer forming step in this aspect is the light-shielding layer having the width of the light-shielding layer in the colored layer of the other pixel region adjacent to light effective for display from the organic EL element of the one pixel region. In this step, the light shielding layer is formed by adjusting the width so as not to transmit.

  About the adjustment method of the width | variety of the light shielding layer used for this process, it can be made to be the same as that of the content demonstrated by the above-mentioned item of "A. In this step, the width of the light shielding layer may be adjusted by actually assembling the organic EL display device, or the width of the light shielding layer may be adjusted by simulation.

  The light shielding layer material, formation method, and light shielding layer obtained in this step can be the same as those described in the above-mentioned section “A. Organic EL display device I. First aspect”. Explanation here is omitted.

2. Other Steps The manufacturing method of the organic EL display device according to this embodiment is not particularly limited as long as it includes the above-described light shielding layer forming step. Usually, the process of forming an organic EL element and an insulating layer on a board | substrate, the process of forming a several colored layer on an organic El element, and the process of forming another structure as needed can be mentioned. The formation method of these structures and the obtained structure can be the same as the contents described in the section “A. Organic EL display device I. First aspect”, and thus the description thereof is omitted here.

3. Organic EL Display Device The organic EL display device obtained by the manufacturing method of the present embodiment can be the same as the contents described in the above-mentioned section “A. Organic EL display device I. First embodiment”. The description in is omitted.

II. Second aspect A method for manufacturing an organic EL display device according to this aspect includes a substrate, an organic EL element formed on the substrate and disposed in a pixel region, and disposed between the pixel region and formed on the substrate. A manufacturing method for manufacturing an organic EL display device having an insulating layer and a colored layer of a plurality of colors formed on the organic EL element and disposed in the pixel region, wherein the shape of the colored layer and the colored layer The colored layer is adjusted so that the width between them is a shape and width in which light effective for display from the organic EL element in one of the pixel regions does not pass through the colored layers of other adjacent pixel regions. It is a manufacturing method characterized by having the colored layer formation process which forms.

11A to 11E are schematic cross-sectional views illustrating an example of a method for manufacturing the organic EL display device of this aspect. First, as shown in FIG. 11A, the organic EL element 2 and the insulating layer 3 are formed on the substrate 1, and the barrier layer 6 is formed so as to cover the organic EL element 2 and the insulating layer 3. Next, although not illustrated, as shown in FIG. 11B, a red colored layer forming layer 4R ′ is then applied by applying a red colored layer composition containing a red color material and a binder resin onto the barrier layer. Form. Next, as shown in FIG. 11 (c), the red colored layer 4R ′ shown in FIG. 11 (d) is developed by irradiating the red colored layer forming layer 4R ′ with the exposure light L through the photomask M, followed by development. (Colored layer forming step). In this aspect, the shape of the red colored layer and the width between the red colored layers are such that light effective for display from the organic EL element in one pixel region is transmitted through the colored layer in the adjacent pixel region. The colored layer is formed by adjusting so as not to have a shape and width. FIG. 11D shows an example in which the organic EL element 2 is adjusted so as not to contact the traveling direction of the light L _min having the lowest effective angle. Similarly, a green colored layer and a blue colored layer are formed. Through the above steps, the organic EL display device 10 shown in FIG. 11E can be manufactured.

According to this aspect, by having the colored layer forming step, it is possible to manufacture an organic EL display device capable of suppressing color shift of a display image due to light leakage to adjacent pixels.
Hereinafter, the detail of the manufacturing method of the organic EL display device of this aspect is demonstrated.

1. Colored layer forming step In the colored layer forming step in this embodiment, the shape of the colored layer and the width between the colored layers are adjacent to the pixel region where light effective for display from the organic EL element of the one pixel region is adjacent. This is a step of adjusting the shape and width so as not to pass through the colored layer and forming the colored layer.

  The method for adjusting the shape of the colored layer and the width between the colored layers used in this step may be the same as the contents described in the above-mentioned section “A. Organic EL display device II. Second aspect”. it can. In this step, the shape of the colored layer and the width between the colored layers may be adjusted by actually assembling the organic EL display device, and the shape of the colored layer and the width between the colored layers are simulated by simulation. May be adjusted.

  About the material of the colored layer used for this process, the formation method, and the obtained colored layer, since it can be made to be the same as that of the content explained in the above-mentioned section of “A. Organic EL display device I. First aspect”. Explanation here is omitted.

2. Other Steps The method for producing the organic EL display device according to this aspect is not particularly limited as long as it has the above-described colored layer forming step. Usually, the process of forming an organic EL element and an insulating layer on a board | substrate, and the process of forming another structure as needed can be mentioned. The formation method of these structures and the obtained structure can be the same as the contents described in the section “A. Organic EL display device I. First aspect”, and thus the description thereof is omitted here.

3. Organic EL Display Device The organic EL display device obtained by the manufacturing method of this aspect can be the same as the contents described in the above-mentioned section “A. Organic EL display device II. Second aspect”. The description in is omitted.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples.
(Preparation of black matrix material)
First, 63 parts by mass of methyl methacrylate (MMA), 12 parts by mass of acrylic acid (AA), 6 parts by mass of 2-hydroxyethyl methacrylate (HEMA), and 88 parts by mass of diethylene glycol dimethyl ether (DMDG) in the polymerization tank. After the parts were charged, stirred and dissolved, 7 parts by mass of 2,2′-azobis (2-methylbutyronitrile) was added and dissolved uniformly. Then, it stirred at 85 degreeC under nitrogen stream for 2 hours, and also was made to react at 100 degreeC for 1 hour. Further, 7 parts by mass of glycidyl methacrylate (GMA), 0.4 parts by mass of triethylamine, and 0.2 parts by mass of hydroquinone were added to the resulting solution, and the mixture was stirred at 100 ° C. for 5 hours to obtain a copolymer resin solution ( A solid content of 50%) was obtained.
Next, the following materials were stirred and mixed at room temperature to obtain a curable resin composition.
<Composition of curable resin composition>
-Copolymer resin solution (solid content 50%)-16 parts by mass-Dipentaerythritol pentaacrylate (Sartomer SR399)
... 24 parts by mass · Ortho-cresol novolak type epoxy resin (Epico Shell Epoxy Co., Ltd. Epicoat 180S70) ... 4 parts by mass · 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one ... 4 parts by mass Parts ・ Diethylene glycol dimethyl ether… 52 parts by mass

Next, the following components were mixed and sufficiently dispersed in a sand mill to prepare a black pigment dispersion.
<Composition of black pigment dispersion>
Black pigment (Mitsubishi Chemical Corporation # 2600) ... 20 parts by mass Polymer dispersion (Big Chemie Japan, Ltd. Disperbyk 111)
... 16 parts by mass, solvent (diethylene glycol dimethyl ether) ... 64 parts by mass

Thereafter, the following components were sufficiently mixed to obtain a black matrix material (optical density (OD) of 3.0 or more).
<Composition of black matrix material>
Black pigment dispersion: 43 parts by weight Curable resin composition: 19 parts by weight Diethylene glycol dimethyl ether: 38 parts by weight

[Example 1]
The organic EL display device illustrated in FIG. 1 was produced according to the following method.

(Preparation of organic EL element substrate)
As a support substrate, a glass substrate (manufactured by Asahi Glass Co., Ltd., AN100 glass) was prepared, and a thin film transistor circuit was produced according to a conventional method with respect to the support substrate. On this, a back electrode layer made of aluminum was formed so as to correspond to a colored layer of each color of the color filter layer described later, and an insulating layer made of polyimide was formed in the gap between these back electrode layers. The insulating layer portion was a non-light emitting area of the organic EL element substrate, and its width was 5 μm.
Next, an organic EL element (laminated structure of a hole injection layer, a white light emitting layer, and an electron injection layer) was formed in the gap between the insulating layers, and a transparent electrode layer made of indium tin oxide (ITO) was formed thereon. .
Next, a silicon nitride film was formed as a transparent barrier layer by a vapor deposition method. The film thickness was 500 nm.

(Preparation of light shielding layer and colored layer)
Using the black matrix material prepared as described above at a position corresponding to the inside of the outer periphery of the pixel portion when a color filter layer to be described later is disposed on the surface of the transparent barrier layer, a width of 5.0 μm and a thickness by photolithography. A light shielding portion (line width 5 μm) between adjacent pixels was formed so as to have a thickness of 1.3 μm.
Next, red, green, blue, and white colored layers having the following composition were formed in the gaps between the light shielding portions between adjacent pixels by photolithography so as to form a line in this order. In addition, the curable resin composition contained in each colored layer is the same as the curable resin composition in the black matrix material prepared as described above. The thickness of the formed colored layer was 2.8 μm, adjacent colorants were overlapped, and the width was 5.0 μm or less.

<Red colored layer forming composition>
・ C. I. Pigment Red 254 ... 10 parts by mass, polysulfonic acid type polymer dispersant ... 8 parts by mass, the curable resin composition described above ... 15 parts by mass, 3-methoxybutyl acetate ... 67 parts by mass

<Green colored layer forming composition>
・ C. I. Pigment Green 58: 10 parts by mass / C.I. I. Pigment Yellow 138 3 parts by weight, polysulfonic acid type polymer dispersant 8 parts by weight, the curable resin composition 12 parts by weight, and 3-methoxybutyl acetate 67 parts by weight

<Blue colored layer forming composition>
・ C. I. Pigment Blue 1 ... 5 parts by mass, polysulfonic acid type polymer dispersant ... 3 parts by mass, the curable resin composition described above ... 25 parts by mass, 3-methoxybutyl acetate ... 67 parts by mass

<White layer forming composition>
-The curable resin composition ... 33 parts by mass--3-methoxybutyl acetate ... 67 parts by mass

(Production of organic EL display device)
The organic EL light-emitting device substrate having the light shielding layer and the colored layer obtained as described above and a glass substrate (manufactured by Asahi Glass Co., Ltd., AN100) are bonded with a 10 μm-thick resin adhesive layer to form an organic EL display device. Was made.

[Example 2]
An organic EL display device was produced in the same manner as in Example 1 except that the light shielding layer was formed after forming the colored layer.

[Example 3]
An organic EL display device was produced in the same manner as in Example 2 except that the thickness of the colored layer was 3.0 μm.

[Reference example]
An organic EL display device was produced in the same manner as in Example 2 except that the thickness of the colored layer was 2.5 μm.

[Comparative Example 1]
An organic EL display device was produced in the same manner as in Example 1 except that the light shielding layer and the colored layer were formed on the counter substrate side.

[Comparative Example 2]
An organic EL display device was produced in the same manner as in Example 2 except that the light shielding layer and the colored layer were formed on the counter substrate side.

[Evaluation]
The parallax (color shift when viewed from an oblique direction) of the produced organic EL display device was evaluated. As a result, no color misregistration occurred in the organic EL display devices of Examples 1 to 3. On the other hand, color misregistration occurred in the organic EL display devices of Reference Example and Comparative Examples 1-2.
Comparing Example 1 with Comparative Example 1 and Example 2 with Comparative Example 2, a display element having good viewing angle characteristics without parallax even when having the same opening area by being close to the light emitting layer side Was found to be obtained.
Also, from the results of the organic EL display devices of Examples 2 and 3 and the reference example, the reason why the color shift occurred in the reference example is that display is effective when the distance between the light-shielding layer and the light emitting layer varies depending on the thickness of the colored layer. Since the light has an angle, it is considered that the light enters the adjacent pixel without being blocked by the light blocking layer.

DESCRIPTION OF SYMBOLS 1 ... Substrate 2 ... Organic EL element 3 ... Insulating layer 4 ... Colored layer 5 ... Light-shielding layer 10 ... Organic EL display device 9, 9a, 9b ... Pixel region P ... Pixel

Claims (4)

A substrate,
An organic electroluminescence element formed on the substrate and disposed in a pixel region;
An insulating layer formed on the substrate and disposed between the pixel regions;
A plurality of colored layers formed on the organic electroluminescence element and disposed in the pixel region;
An organic electroluminescence display device having a light-shielding layer formed on the insulating layer and defining pixels;
The width of the light-shielding layer is a width that prevents light effective for display from the organic electroluminescence element in one pixel region from passing through the colored layer in another adjacent pixel region. Luminescence display device. A substrate,
An organic electroluminescence element formed on the substrate and disposed in a pixel region;
An insulating layer formed on the substrate and disposed between the pixel regions;
An organic electroluminescence display device having a plurality of colored layers disposed on the pixel region and formed on the organic electroluminescence element,
The shape of the colored layer and the width between the colored layers are such that light effective for display from the organic electroluminescence element in one pixel region does not pass through the colored layer in another pixel region adjacent to the pixel layer, and An organic electroluminescence display device having a width. A substrate,
An organic electroluminescence element formed on the substrate and disposed in a pixel region;
An insulating layer formed on the substrate and disposed between the pixel regions;
A plurality of colored layers formed on the organic electroluminescence element and disposed in the pixel region;
An organic electroluminescence display device manufacturing method for manufacturing an organic electroluminescence display device having a light shielding layer formed on the insulating layer and defining pixels,
The light-shielding layer is adjusted so that the light effective for display from the organic electroluminescence element in one pixel region does not pass through the colored layer in another adjacent pixel region. The manufacturing method of the organic electroluminescent display apparatus characterized by having the light shielding layer formation process which forms a layer. A substrate,
An organic electroluminescence element formed on the substrate and disposed in a pixel region;
An insulating layer formed on the substrate and disposed between the pixel regions;
An organic electroluminescence display device manufacturing method for manufacturing an organic electroluminescence display device having a plurality of colored layers formed on the organic electroluminescence element and disposed in the pixel region,
The shape of the colored layer and the width between the colored layers are such that light effective for display from the organic electroluminescence element in one pixel region does not pass through the colored layer in another pixel region adjacent to the pixel layer, and A method for producing an organic electroluminescence display device, comprising a colored layer forming step of forming the colored layer by adjusting the width.