JP5320267B2 - Organic EL display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL display for 3D display with a high aperture ratio and easy to manufacture. <P>SOLUTION: The organic EL display for 3D display is provided with a substrate 101, a plurality of sub pixels 120 arranged in a matrix shape on the substrate 101, and banks 105 defining areas where the sub pixels 120 are arranged. In the organic EL display for 3D display, each sub pixel 120 is equipped with pixel electrodes A and 103R and pixel electrodes B and 103L arranged on the substrate 101, and an organic functional layer arranged over a whole face of the region defined by the banks 105 for covering the pixel electrodes A and 103R and the pixel electrodes B and 103L, with the pixel electrodes A and 103R and the pixel electrodes B and 103L arranged between the banks 105 opposed to each other. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an organic EL display, and more particularly to an organic EL display for 3D display.

  A display for 3D display that can display a stereoscopic image to the user by providing a set of images having parallax to the right eye and the left eye of the user has been put into practical use. In recent years, development of a display for 3D display that can provide a stereoscopic image to a user without using special glasses has attracted attention.

  As a method for providing a stereoscopic image to a user without using special glasses or the like, there are methods called a parallax barrier method and a lenticular method.

  In the parallax barrier method, the display for 3D display provides an image for the left eye to the user's left eye and an image for the right eye to the user's right eye by a polarizing plate having a strip-shaped slit. Thereby, the user can observe a stereoscopic image.

  The lenticular method provides a left eye image to the user's left eye and a right eye image to the user's right eye by a sheet having a fine cylindrical lens (lenticular lens). Thereby, the user can observe a stereoscopic image (for example, refer patent document 1).

  By the way, the organic EL display is a display having an organic EL element utilizing electroluminescence of an organic compound. The organic EL element includes a pixel electrode and a counter electrode, and an organic light emitting layer that emits electroluminescence and is disposed between the two electrodes. The material of the organic light emitting layer that emits electroluminescence can be broadly classified into a combination of a low molecular organic compound (host material and dopant material) and a high molecular organic compound. Examples of the polymer organic compound that emits electroluminescence include polyphenylene vinylene called PPV and derivatives thereof.

  The organic light emitting layer containing a high molecular organic compound is formed, for example, by applying a material liquid containing an organic light emitting material and a solvent onto the pixel electrode by inkjet or the like. In this way, when the organic light emitting layer is formed by a coating method, the subpixels that emit different colors are separated by an insulating partition (bank) so that the material liquid does not enter the subpixels that emit different colors.

  Since organic EL displays are expected to be self-luminous and have high contrast, thinness, light weight, and low power consumption, they are currently being actively researched. In addition, since the organic EL display has a high response speed (about 100 μs), it is suitable for a display for 3D display that requires a high response speed (see, for example, Patent Document 1).

  FIG. 1 is a cross-sectional view of subpixels included in an organic EL display having a lenticular 3D display function described in Patent Document 1. As shown in FIG. 1, the sub-pixel included in the organic EL display of Patent Document 1 covers the substrate 1 and two OLEDs (# 1 and # 3) arranged on the substrate 1, and the substrate 1 and the OLED. A semi-cylindrical lens array 2 is provided. Each OLED has a first electrode, an organic light emitting layer, and a second electrode. As shown in FIG. 1, the functional layers (organic light emitting layer, second electrode, etc.) of each OLED are independent.

  OLED # 1 emits light for the right eye, and OLED # 3 emits light for the left eye. As described above, the combination of OLED # 1 and OLED # 3 and the semi-cylindrical lens array can display a right-eye image on the user's right eye and a left-eye image on the user's left eye. it can. Thereby, it becomes possible to produce parallax between a right eye and a left eye, and a stereoscopic image can be provided to the user.

JP 2008-304715 A

  However, as described in Patent Document 1, in order to fabricate a right-eye OLED and a left-eye OLED in which each functional layer is independent in one subpixel, the functional layer is extremely finely patterned. There is a need. This complicates the manufacturing process and tends to cause defects.

  Moreover, in order to make the functional layer of each OLED independent, a fixed space | interval is needed between each OLED. Since the distance between each OLED is a non-light emitting region, the aperture ratio of the display decreases as the distance between each OLED increases.

  This invention is made | formed in view of this point, and it aims at providing the organic EL display for 3D displays which can be manufactured easily and has a high aperture ratio.

  The present inventor found that the organic EL layer for 3D display functions without separating the organic functional layer of the sub-pixel of the organic EL display for 3D display into that for the right eye and that for the left eye. Completed the invention.

The present invention relates to the following organic EL display.
[1] substrate and, a plurality of sub-pixels arranged in a matrix on the substrate, an organic EL display having a bank defining the sub-pixels are arranged region,
The substrate has a concave bend between the banks facing each other;
Each of the sub-pixels is disposed over the entire area defined by the bank and the pixel electrode A and the pixel electrode B disposed on the concavely curved portion of the substrate, and the pixel electrode A and the pixel electrode B An organic functional layer covering
The organic EL display in which the pixel electrode A and the pixel electrode B are disposed between the banks facing each other.
[2] The organic EL display according to [1], wherein a region of the substrate defined by the bank is coated with an insulating inorganic film.
[3] The organic EL display according to [1] or [2], wherein the layer closest to the substrate among the organic functional layers is insulative.

  In the organic EL display for 3D display of the present invention, the organic functional layer of each sub-pixel is not separated for the right eye and the left eye, so that it can be easily produced. Further, in the organic EL display for 3D display according to the present invention, a partition for separating the functional layer for the right eye and the functional layer for the left eye that each subpixel has is not required, and accordingly, the light emission area is large and the aperture ratio is high. .

Sectional view of a conventional organic EL display having a 3D display function 3 is a perspective view of the organic EL display for 3D display according to Embodiment 1. FIG. Plan view of organic EL display for 3D display according to Embodiment 1 Plan view and sectional view of sub-pixels included in organic EL display for 3D display according to Embodiment 1 The figure which shows the advancing direction of the light emitted from the subpixel contained in the organic electroluminescent display for 3D displays of Embodiment 1. Plan view of sub-pixels included in organic EL display for 3D display of embodiment 2 Sectional drawing of the subpixel contained in the organic EL display for 3D display of Embodiment 3 Sectional drawing of the subpixel contained in the organic EL display for 3D display of Embodiment 4 Sectional drawing of the subpixel contained in the organic EL display for 3D display of Embodiment 5 The perspective view of the organic EL display for 3D display of Embodiment 6 Plan view of organic EL display for 3D display according to Embodiment 6

  The organic EL display of the present invention includes a substrate, subpixels (organic EL elements) arranged in a matrix on the substrate, and a bank that defines a region in which the subpixels are arranged.

[substrate]
The material of the substrate differs depending on whether the organic EL display is a bottom emission type or a top emission type. For example, when the display is a bottom emission type, the substrate is required to be transparent. Therefore, when the display is a bottom emission type, examples of the material of the substrate include glass, quartz, and transparent plastic.
On the other hand, when the display is a top emission type, the substrate does not need to be transparent. Therefore, when the display is a top emission type, the material of the substrate is arbitrary as long as it is an insulator, and is, for example, opaque plastic or metal.

  The size and thickness of the substrate may be appropriately set according to the size of the organic EL display to be manufactured, the material of the substrate, and the like. Further, a thin film transistor (TFT) for driving a pixel electrode described later may be incorporated in the substrate.

  A material liquid for an organic functional layer, which will be described later, is applied to the region defined by the bank on the substrate. For this reason, it is preferable that the area | region prescribed | regulated by the bank among board | substrates has lyophilic property with respect to the material liquid of an organic functional layer. This is because by making the substrate lyophilic with respect to the material liquid of the organic functional layer, the material liquid of the organic functional layer is well adapted to the substrate and an organic functional layer having a uniform film thickness can be formed. .

  In order to make the region defined by the bank of the substrate lyophilic, the region defined by the bank of the substrate may be coated with an insulating inorganic material such as silicon oxide having a high lyophilic property.

[Subpixel]
“Sub-pixel” means a region where an organic EL element is formed. The sub-pixel includes a sub-pixel that emits red light, a sub-pixel that emits green light, and a sub-pixel that emits blue light. The sub-pixels that emit these three colors (RGB) constitute one pixel.

[bank]
A bank is an insulator disposed on a substrate that defines a region in which subpixels are disposed. The bank may surround four sides of each subpixel, or may define an area in which subpixels emitting the same color light are arranged in a line (see FIG. 3). When the bank surrounds the four sides of each sub-pixel, the organic EL display has a grid-like bank. On the other hand, when the bank defines a region where sub-pixels emitting the same color light are arranged in a line, the organic EL display has a line-shaped bank.

  A bank prescribes | regulates the area | region where the material liquid of the organic functional layer mentioned later is applied. The material of the bank is not particularly limited as long as it is an insulator. Examples of the bank material include an insulating resin such as polyimide. The surface of the bank preferably has low wettability (for example, liquid repellency). In order to reduce the wettability of the bank surface, for example, the bank material may be an insulating resin containing a fluorine resin, or the bank surface may be treated with fluorine-based gas plasma.

  Next, the configuration of each subpixel will be described. Each subpixel has 1) a pair of pixel electrodes (pixel electrode A and pixel electrode B), 2) an organic functional layer, and 3) a counter electrode. Thus, in the present invention, each subpixel has two pixel electrodes, whereas each subpixel has one organic functional layer and a counter electrode.

1) Pixel electrode A and pixel electrode B
The pixel electrode is a conductive member disposed on the substrate. The pixel electrode normally functions as an anode, but may function as a cathode. Further, a film made of a metal oxide (for example, tungsten oxide or molybdenum oxide) may be formed on the surface of the pixel electrode as a hole injection layer.

  As described above, each sub-pixel has a pair of pixel electrodes (pixel electrode A and pixel electrode B). In other words, the pair of pixel electrodes are arranged in a region defined by two banks facing each other (see FIGS. 4A and 4B). The distance between the pixel electrode A and the pixel electrode B is preferably 5 to 20 μm. The dimensions of the pixel electrode A and the pixel electrode B are preferably the same. The pixel electrode A and the pixel electrode B are electrically insulated and controlled by separate driving TFTs.

When the display is a bottom emission type, the pixel electrode is required to be a transparent electrode. Examples of the material of such a pixel electrode include ITO (indium tin oxide), IZO (indium zinc oxide), ZnO (zinc oxide), and the like.
When the display is a top emission type, the pixel electrode is required to have light reflectivity. Examples of such pixel electrode materials include silver-containing alloys, more specifically, silver-palladium-copper alloys (also referred to as APC), silver-ruthenium-gold alloys (also referred to as ARA), and MoCr (molybdenum chromium). And aluminum alloys such as NiCr (nickel chrome) and aluminum-neodymium alloy (also referred to as Al-Nd). An ITO film and an IZO film (Indium Zinc Oxide) may be disposed on the surface of the reflective pixel electrode.

2) Organic functional layer The organic functional layer is a layer including at least an organic light emitting layer disposed on the pixel electrode. In the present invention, the layer closest to the substrate among the organic functional layers is insulative.

  The organic functional layer is formed by applying the material liquid of the organic functional layer to the region defined by the bank described above. For example, an organic functional layer material solution (a solution in which an organic functional layer material is dissolved in an organic solvent such as anisole or cyclohexylbenzene) is applied by a coating method (for example, an ink jet method) and dried to obtain an organic functional layer. A layer can be formed. For this reason, in the present invention, the organic functional layer is disposed over the entire area surrounded by the bank defining the subpixel arrangement area, and covers the pixel electrode A and the pixel electrode B. Therefore, in the present invention, the subpixel has only one organic functional layer.

  The organic EL material contained in the organic light emitting layer of the organic functional layer is appropriately selected for each sub-pixel according to the color (RGB) of light emitted from the sub-pixel (organic EL element). The organic EL material may be either a high-molecular organic EL material or a low-molecular organic EL material, but a high-molecular organic EL material is preferable from the viewpoint of forming by a coating method. This is because by using the polymer organic EL material, the organic light emitting layer can be easily formed without damaging other members. Examples of the polymer organic EL material include polyphenylene vinylene and derivatives thereof, polyacetylene and derivatives thereof, polyphenylene (PP) and derivatives thereof, polyparaphenylene ethylene and derivatives thereof, poly 3- Examples include hexylthiophene (poly-3-hexylthiophene (P3HT)) and its derivatives, polyfluorene (PF) and its derivatives, and the like. Examples of the low molecular organic EL material include tris (8-quinolinolato) aluminum.

  In addition to the organic light emitting layer, the organic functional layer may have a hole transport layer (interlayer), an electron injection layer, an electron transport layer, and the like.

  The hole transport layer is disposed between the pixel electrode (or hole injection layer) and the organic light emitting layer. The hole transport layer has a function of efficiently transporting holes to the organic light emitting layer and a function of blocking intrusion of electrons into the pixel electrode (or hole injection layer). The hole transport layer is a layer made of, for example, a polyaniline-based material. For the hole transport layer, a material liquid of the hole transport layer (for example, a solution in which the material of the hole transport layer is dissolved in an organic solvent such as anisole or cyclobenzene) is placed on the pixel electrode (or hole injection layer). It can be formed by coating. Although the thickness of a positive hole transport layer is not specifically limited, For example, what is necessary is just about 10-40 nm.

  As described above, the layer closest to the substrate among the organic functional layers is insulative. Here, “the layer on the most substrate side of the organic functional layer” means that when the organic functional layer has a hole transport layer, it is a hole transport layer, and when the organic functional layer does not have a hole transport layer, It is an organic light emitting layer. For this reason, when the organic functional layer has a hole transport layer, the hole transport layer is insulative. On the other hand, when the organic functional layer does not have a hole transport layer, the organic light emitting layer is insulative.

  As described above, in the present invention, the pixel electrode of the sub-pixel is patterned into the pixel electrode A and the pixel electrode B, but the organic functional layer is not patterned, so that the manufacturing process is easy. In addition, since a bank for patterning the organic functional layer in the sub-pixel is not necessary, the interval between the pixel electrode A and the pixel electrode B can be reduced, and the aperture ratio can be increased.

  Also, in the vicinity of the bank, the film thickness of the organic functional layer to be formed is likely to be disturbed, but in the present invention, the bank for patterning the organic functional layer in the sub-pixel is omitted, so the film thickness of the organic functional layer is It becomes uniform. When the thickness of the organic functional layer is uniform, the luminance of the sub-pixel is improved. Therefore, in the present invention, the luminance of the display is high and the 3D image quality is high.

  Also, as described above, the most substrate-side layer of the organic functional layer is insulative, so that the pixel electrode A and the pixel electrode B can be formed without patterning the organic functional layer for the pixel electrode A and the pixel electrode B. There is no risk of crosstalk between the two.

3) Counter electrode The counter electrode is a conductive member disposed on the organic functional layer. The counter electrode normally functions as a cathode, but may function as an anode. A plurality of subpixels may share one counter electrode. For example, all the subpixels included in one panel may share one counter electrode.

  The material of the counter electrode differs depending on whether the display is a bottom emission type or a top emission type. In the case of the top emission type, since the counter electrode needs to be transparent, it is preferable to use a conductive member having a transmittance of 80% or more as an example of the material of the counter electrode. Thereby, a display with high luminous efficiency can be obtained.

  Such a transparent cathode may be composed of a layer containing an alkaline earth metal, a layer made of an electron-transporting organic material, and a metal oxide layer. Examples of alkaline earth metals include magnesium, calcium and barium. The electron transporting organic material is, for example, an electron transporting organic semiconductor material. The metal oxide is not particularly limited, and for example, indium tin oxide or indium zinc oxide.

  The transparent cathode may be composed of a layer containing an alkali metal, an alkaline earth metal or a halide thereof and a layer containing silver. The layer containing silver may be comprised only from silver, and may be comprised from a silver alloy. Moreover, you may provide a refractive index adjustment layer with high transparency on the layer containing silver. The light extraction efficiency can be improved by providing the refractive index adjustment layer.

  A sealing film may be further disposed on the counter electrode. The sealing film has a function of protecting the organic functional layer, the pixel electrode, and the like from moisture, heat, impact, and the like. Examples of the material of the sealing film include silicon nitride and silicon oxynitride.

  The organic EL display of the present invention can function as an organic EL display for 3D display using a parallax division method. The organic EL display for 3D display of the present invention may be a lenticular method or a parallax barrier method, but an image becomes dark in the parallax barrier method, so the lenticular method is preferred.

  The lenticular method is a method in which different images are displayed on the user's right eye and left eye by a lenticular lens having a plurality of mutually parallel cylindrical lenses, and a stereoscopic image is displayed to the user (see Embodiment 1).

  The parallax barrier method is a method of displaying different images for the user's right eye and left eye and displaying a stereoscopic image to the user by a parallax barrier having fine slits. In the parallax barrier method, the light for the right eye emitted from the display enters the right eye through the slit of the parallax barrier; the light for the left eye emitted from the display passes through the slit of the parallax barrier. , Enter the left eye. On the other hand, the light for the right eye emitted from the display is blocked by the barrier so that it does not enter the left eye; the light for the left eye emitted from the display is blocked by the barrier so that it does not enter the right eye.

For this reason, the organic EL display of the present invention may have a lenticular lens or a parallax barrier. The lenticular lens and the parallax barrier are arranged on the display surface side of the display with respect to the organic functional layer.
Specifically, in the case of a top emission type display, since light is extracted from the sealing film side, the lenticular lens and the parallax barrier are arranged on the sealing film. On the other hand, in the case of a bottom emission type display, since light is extracted from the substrate side, the lenticular lens and the parallax barrier are disposed on the back surface of the surface on which the pixel electrodes are formed.
Moreover, according to the specific embodiment of the present invention, a 3D image can be displayed without providing a lenticular lens or a parallax barrier (see Embodiment 5).

  In the organic EL display for 3D display of the present invention, one of the pair of pixel electrodes functions to display a right-eye image (right-eye pixel electrode), and the other functions to display a left-eye image (for left-eye). Pixel electrode). Hereinafter, the pixel electrode A is also referred to as a right eye pixel electrode, and the pixel electrode B is also referred to as a left eye pixel electrode.

  In the organic EL display for 3D display of the present invention, the region on the right-eye pixel electrode in the organic light-emitting layer emits light observed by the right eye of the user of the 3D display, and the left-eye pixel electrode in the organic light-emitting layer. The upper region emits light that is observed in the left eye of the user of the 3D display (see FIG. 5).

  As described above, in the present invention, since the organic functional layer is not patterned for the right eye and the left eye, the manufacturing process is easy. In addition, since a bank for patterning the organic functional layer for the right eye and the left eye is not necessary, the interval between the pixel electrode A and the pixel electrode B can be reduced, and the aperture ratio can be increased.

  Hereinafter, embodiments of the production method of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments.

(Embodiment 1)
In Embodiment 1, a lenticular 3D display organic EL display having a line bank will be described. In the first embodiment, the display is a top emission type.

  FIG. 2 is a perspective view of the organic EL display 100 for 3D display according to the first embodiment. As shown in FIG. 2, the organic EL display 100 includes a substrate 101, a counter electrode 109, and a lenticular lens 110. Subpixels 120 are arranged in a matrix on the substrate 101. In the present embodiment, the long axis of the cylindrical lens 111 included in the lenticular lens is parallel to the long axis of a line-shaped bank, which will be described later. Moreover, it is preferable that the pitch at which the cylindrical lens 111 is arranged and the pitch at which the sub-pixel is arranged are the same.

  FIG. 3 is a plan view of the organic EL display 100 for 3D display according to Embodiment 1 in which the lenticular lens 110, the counter electrode 109, and the organic functional layer are omitted. As shown in FIG. 3, the organic EL display 100 according to the first embodiment includes a line bank 105 arranged on a substrate 101.

  A plurality of sub-pixels 120 that emit light of the same color are arranged in a line in an area defined by the line bank 105. The sub-pixel 120R is a sub-pixel that emits red light; the sub-pixel 120G is a sub-pixel that emits green light; the sub-pixel 120B is a sub-pixel that emits blue light.

  FIG. 4A is an enlarged view of the sub-pixel 120 shown in FIG. 4B is a cross-sectional view taken along line AA of the sub-pixel 120 shown in FIG. 4A. In FIG. 4A, the organic functional layer, the counter electrode, and the lenticular lens are omitted, but in FIG. 4B, the organic functional layer, the cathode, and the lenticular lens are not omitted. 4A and 4B, the sub-pixel 120 has a pair of pixel electrodes (a right-eye pixel electrode 103R and a left-eye pixel electrode 103L). The right-eye pixel electrode 103R (pixel electrode A) and the left-eye pixel electrode 103L (pixel electrode B) are disposed between the two banks 105 facing each other. The subpixel 120 includes an organic functional layer 107 disposed over the entire region defined by the bank 105, a counter electrode 109 disposed on the organic functional layer 107, and a lenticular lens 110 disposed on the counter electrode 109. Have

Thus, in the organic EL display of Embodiment 1, each sub-pixel has two pixel electrodes (right-eye pixel electrode and left-eye pixel electrode), whereas the organic functional layer is for left-eye and right-eye use. It is not patterned.
For this reason, an organic functional layer can be formed simply and a manufacturing process is easy. In addition, since a bank for patterning the organic functional layer for the right eye and the left eye is not necessary, the interval between the right eye pixel electrode and the left eye pixel electrode can be reduced, and the aperture ratio can be increased.

  Next, the operation principle of the organic EL display for 3D display according to Embodiment 1 will be described.

  FIG. 5 is a diagram illustrating a trajectory of light emitted from the sub-pixel 120. The broken line X indicates the direction of light emitted from the region on the left-eye pixel electrode 103L in the organic functional layer 107, and the solid line Y originates from the region on the right-eye pixel electrode 103R in the organic functional layer 107. Indicates the direction of the emitted light.

  As shown in FIG. 5, the light emitted from the left-eye pixel electrode 103 </ b> L is bent by the lenticular lens 110 and enters the user's left eye L. On the other hand, the light emitted from the right-eye pixel electrode 103R is bent by the lenticular lens 110 and enters the right eye R of the user.

  As described above, the combination of the left-eye pixel electrode 103L and the right-eye pixel electrode 103R and the lenticular lens 110 displays a right-eye image on the user's right eye and a left-eye image on the user's left eye. be able to. Thereby, parallax can be produced between the right eye and the left eye, and a stereoscopic image can be displayed to the user.

(Embodiment 2)
In Embodiment 2, a mode in which the shape of the pixel electrode for the right eye and the pixel electrode for the left eye is a comb shape will be described.

  FIG. 6 is a plan view of the sub-pixel 220 included in the 3D display organic EL display according to the second embodiment. As shown in FIG. 6, the sub-pixel 220 of the second embodiment is the same as the sub-pixel 120 of the first embodiment except that the shape of the pixel electrode is different. Therefore, the same components as those of the sub-pixel of Embodiment 1 are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 6, the sub-pixel 220 includes a comb-shaped right-eye pixel electrode 203R and a left-eye pixel electrode 203L. The teeth 204R of the comb-shaped right-eye pixel electrode 203R and the teeth 204L of the comb-shaped left-eye pixel electrode 203L are engaged with each other.

  In the display as described in the first embodiment, there is a possibility that the film thickness of the organic functional layer may be disturbed due to a difference in level between the pixel electrode, the substrate, and the surface. Disturbances in the thickness of the organic functional layer also lead to disturbances in luminance. For this reason, there is a possibility that the luminance of the pixel electrode is disturbed along the contour. However, if the shape of the right-eye pixel electrode and the left-eye pixel electrode is a comb shape as in the present embodiment, the luminance disturbance along the contour of the pixel electrode is less noticeable.

  In addition, by engaging the teeth of the comb-shaped right-eye pixel electrode and the teeth of the comb-shaped left-eye pixel electrode, the distance between the right-eye pixel electrode and the left-eye pixel electrode can be reduced, and the display The aperture ratio can be increased.

  For this reason, according to the present embodiment, in addition to the effects of the first embodiment, it is possible to provide an organic EL display for 3D display that has no luminance unevenness and a high aperture ratio.

(Embodiment 3)
In Embodiment 3, a mode in which the cross section of the pixel electrode is a forward taper will be described.

  FIG. 7 is a cross-sectional view of the sub-pixel 320 included in the 3D display organic EL display according to the third embodiment. As shown in FIG. 7, the sub-pixel 320 of the third embodiment is the same as the sub-pixel 120 of the first embodiment except that the cross-sectional shape of the pixel electrode is different. Therefore, the same components as those of the sub-pixel of Embodiment 1 are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 7, the sub-pixel 320 includes a forward-tapered right-eye pixel electrode 303R and a forward-tapered left-eye pixel electrode 303L.

As described above, by making the right-eye pixel electrode 303R and the left-eye pixel electrode 303L into a forward tapered shape, a level difference based on the height difference between the pixel electrode surface and the substrate surface can be reduced. Thereby, the area | region where an organic functional layer is apply | coated can be smoother, and the organic functional layer which has a uniform film thickness is obtained.
Therefore, according to the present embodiment, in addition to the effects of the first embodiment, an organic EL display for 3D display without luminance unevenness can be provided.

(Embodiment 4)
In Embodiment 4, a mode in which a right-eye pixel electrode and a left-eye pixel electrode are embedded in a substrate will be described.

  FIG. 8 is a cross-sectional view of the sub-pixel 420 included in the 3D display organic EL display according to the fourth embodiment. As shown in FIG. 8, the sub-pixel 420 of the fourth embodiment is the same as the sub-pixel 120 of the first embodiment except that the pixel electrode is embedded in the substrate. Therefore, the same components as those of the sub-pixel of Embodiment 1 are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 8, the sub-pixel 420 includes a right-eye pixel electrode 403R and a left-eye pixel electrode 403L embedded in the substrate 101. The height of the surface of the right-eye pixel electrode 403R and the left-eye pixel electrode 403L is the same as the height of the surface of the substrate 101. In order to manufacture the right-eye pixel electrode 403R and the left-eye pixel electrode 403L embedded in the substrate 101, the pixel electrode may be formed on the substrate 101, and then the substrate 101 may be pressed with a heat roll. Further, a recess having the same depth as the thickness of the pixel electrode is formed on the surface of the substrate 101 before the formation of the pixel electrode, and the pixel electrode is formed in the recess so as to be embedded in the substrate as in this embodiment. A pixel electrode can also be produced.

Thus, by making the surface height of the right-eye pixel electrode 403R and the left-eye pixel electrode 403L the same as the surface height of the substrate 101, there is no level difference due to the height difference between the pixel electrode surface and the substrate surface. The area where the organic functional layer is applied can be flattened. For this reason, an organic functional layer having a uniform film thickness is obtained.
Therefore, according to the present embodiment, in addition to the effects of the first embodiment, an organic EL display for 3D display without luminance unevenness can be provided.

(Embodiment 5)
In Embodiment 5, an organic EL display for 3D display that does not use a lenticular lens and a parallax barrier will be described.

  FIG. 9 is a cross-sectional view of the sub-pixel 520 included in the 3D display organic EL display according to the fifth embodiment. As shown in FIG. 9, the subpixel 520 of the second embodiment is the same as the subpixel 120 of the first embodiment except that the shape of the substrate is different. Therefore, the same components as those of the sub-pixel of Embodiment 1 are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 9, the subpixel 520 includes a substrate 501 having a concave curved portion 502. In the concave curved portion 502, a right-eye pixel electrode 503R and a left-eye pixel electrode 503L are arranged. The broken line X indicates the direction of light emitted from the left-eye pixel electrode 503L, and the solid line Y indicates the direction of light emitted from the right-eye pixel electrode 503R in the organic functional layer 107.

As shown in FIG. 9, the direction of light emitted from the left-eye pixel electrode 503L is controlled by the concave curved portion 502, and is incident on the left eye of the user. On the other hand, the direction of the light emitted from the right-eye pixel electrode 503R is controlled by the concave curved portion 502, and enters and enters the right eye of the user.
Thus, by forming the concave curved portion 502 on the substrate 501, parallax is generated between the right eye and the left eye of the user without using a lenticular lens or a parallax barrier, and a stereoscopic image is displayed to the user. Can do.

(Embodiment 6)
In the first embodiment, the example in which the major axis of the pixel electrode and the major axis of the line-shaped bank are parallel to each other has been described. In the sixth embodiment, an example in which the major axis of the pixel electrode and the major axis of the line bank are orthogonal to each other will be described.

  FIG. 10 is a perspective view of an organic EL display 600 for 3D display according to the sixth embodiment. Constituent members that are the same as those of the sub-pixel of the first embodiment are given the same reference numerals and description thereof is omitted. Sub-pixels 620 are arranged in a matrix on the substrate 101. In the present embodiment, the long axis of the cylindrical lens 111 included in the lenticular lens is orthogonal to the long axis of the line-shaped bank 105 described later.

  FIG. 11 is a plan view of an organic EL display 600 for 3D display according to Embodiment 6 in which the lenticular lens, the counter electrode, and the organic functional layer are omitted. As shown in FIG. 11, a plurality of sub-pixels 620 that emit light of the same color are arranged in a line in the region defined by the line bank 105. The sub-pixel 620R is a sub-pixel that emits red light; the sub-pixel 620G is a sub-pixel that emits green light; the sub-pixel 620B is a sub-pixel that emits blue light. As described above, in this embodiment, the pixel composed of the sub-pixel 620R, the sub-pixel 620G, and the sub-pixel 620B becomes longer in the vertical direction of the display and becomes shorter in the horizontal direction of the display.

  The sub-pixel 620 includes a right-eye pixel electrode 603R and a left-eye pixel electrode 603L. The major axis of the right-eye pixel electrode 603R and the left-eye pixel electrode 603L is orthogonal to the major axis of the line bank 105.

  As described above, in the sixth embodiment in which the long axis of the pixel electrode is orthogonal to the long axis of the line-shaped bank, the pixel becomes longer in the vertical direction of the display and becomes shorter in the horizontal direction of the display. For this reason, the number of pixels arranged in the horizontal direction of the display increases, and the horizontal resolution of the display increases.

  According to the present invention, an organic EL display for 3D display that has a simple manufacturing process and a high aperture ratio can be provided.

100, 600 3D display organic EL display 101, 501 Substrate 103, 203, 303, 403, 503, 603 Pixel electrode 105 Bank 107 Organic functional layer 109 Counter electrode 110 Lenticular lens 111 Cylindrical lens 120, 220, 320, 420, 520 , 620 Subpixel 502 Concave curve

Claims (3)

A substrate, a plurality of sub-pixels arranged in a matrix on the substrate, an organic EL display having a bank defining the sub-pixels are arranged region,
The substrate has a concave bend between the banks facing each other;
Each of the sub-pixels is disposed over the entire area defined by the bank and the pixel electrode A and the pixel electrode B disposed on the concavely curved portion of the substrate, and the pixel electrode A and the pixel electrode B An organic functional layer covering
The organic EL display in which the pixel electrode A and the pixel electrode B are disposed between the banks facing each other.   The organic EL display according to claim 1, wherein a region defined by the bank of the substrate is coated with an insulating inorganic film.   The organic EL display according to claim 1, wherein the layer closest to the substrate among the organic functional layers is insulative.

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