KR102587819B1 - Organic light emitting display device and method of manufacturing the same - Google Patents

Abstract

An organic light emitting display device is provided. The organic light emitting display device includes a red subpixel, a green subpixel, a blue subpixel, and a white subpixel, and includes a lower substrate. The organic light emitting device is disposed on the lower substrate in each of the red subpixel, green subpixel, blue subpixel, and white subpixel, and includes an anode, an organic light emitting layer disposed on the anode, and a cathode. The upper substrate faces the lower substrate. The color filter is disposed below the upper substrate and includes a red color filter disposed to correspond to the red subpixel, a green color filter disposed to correspond to the green subpixel, and a blue color filter disposed to correspond to the blue subpixel. The external light absorption pattern is disposed within the white subpixel at the bottom of the upper substrate. In the organic light emitting display device according to an embodiment of the present invention, an external light absorption pattern disposed in a white subpixel absorbs external light incident on the white subpixel, thereby reducing external light reflectance.

Description

Organic light emitting display device and organic light emitting display device manufacturing method {ORGANIC LIGHT EMITTING DISPLAY DEVICE AND METHOD OF MANUFACTURING THE SAME}

The present invention relates to an organic light emitting display device and a method of manufacturing an organic light emitting display device, and more specifically, to an organic light emitting display device and a method of manufacturing an organic light emitting display device that can reduce external light reflection.

An organic light emitting display (OLED) is a self-emitting display device that includes multiple pixels, with one pixel emitting red (R), green (G), blue (B), or white (W). contains subpixels. Each subpixel may emit light independently, and each subpixel may be distinguished by a black matrix (BM).

An organic light emitting display device includes an organic light emitting device that emits light, and the organic light emitting device includes an anode, an organic light emitting layer, and a cathode. The organic light emitting display device may emit light using a top emission method or a bottom emission method, and the light emission method of the organic light emitting display device may vary depending on the configuration of the anode and cathode. A top emission type organic light emitting display device emits light toward the upper substrate. In order to emit light emitted from the organic light emitting layer upward, the anode may include a reflective layer and the cathode may be composed of a transparent electrode. A bottom emission type organic light emitting display device emits light toward the lower substrate. In order to emit light emitted from the organic light emitting layer downward, the anode may be composed of a transparent electrode and the cathode may be composed of an opaque electrode. .

An organic light emitting display device may be constructed by arranging an organic light emitting material in each subpixel. Additionally, the organic light emitting display device includes an organic light emitting element that emits white light throughout the red subpixel, green subpixel, blue subpixel, and white subpixel, with a red color filter in the red subpixel and a green color filter in the green subpixel. , the blue subpixel may include a configuration in which a blue color filter is disposed. Accordingly, an organic light emitting display device including a color filter emits red light through a red color filter in a red subpixel, emits green light through a green color filter in a green subpixel, and emits green light through a blue color filter in a blue subpixel. It emits blue light. Here, the white subpixel without a color filter emits white light emitted from the organic light emitting device. In this specification, the description will be based on a top emission organic light emitting display device that includes an organic light emitting element that emits white light and a color filter.

Since there is no color filter in the white subpixel of the organic light emitting display device, external light has a greater influence than other subpixels in which color filters are disposed. Specifically, in a white subpixel, external light that reaches the top of the upper substrate may pass through the upper substrate and reach the organic light emitting device, and may reach the anode of the organic light emitting device and be reflected by the reflection layer of the anode. Here, the external light reflected by the reflective layer may be emitted from the white subpixel through the upper substrate to the outside of the organic light emitting display device. This external light reflection has a problem in that it reduces the luminous efficiency of the top emission type organic light emitting display device and may cause inconvenience to the user.

Accordingly, there is a need for an organic light emitting display device and a method of manufacturing an organic light emitting display device that can suppress external light reflection while maintaining the aperture ratio of the light emitting portion of the white subpixel as much as possible.

[Related technical literature]

1. White front-emitting organic electroluminescent display device (Patent Application No. 10-2008-0127996)

2. Electroluminescent display device (Patent Application No. 10-2013-0101500)

In order to solve the problem that external light incident on a white subpixel in an organic light emitting display device is reflected by the reflector of an anode disposed in the white subpixel as described above, the inventors of the present invention developed a device that can reduce the reflectance of external light. A new structure and manufacturing method for an organic light emitting display device were invented.

Accordingly, the problem to be solved by the present invention is to provide an organic light emitting display device and a method of manufacturing an organic light emitting display device that can reduce external light reflection in the white subpixel by disposing a black matrix capable of absorbing external light in the white subpixel. It is done.

In addition, another problem to be solved by the present invention is that the aperture ratio of the white subpixel may be reduced due to the black matrix disposed in the white subpixel, and accordingly, to compensate for the reduced luminous efficiency of the white subpixel, An organic light emitting display device and a method of manufacturing an organic light emitting display device that can secure light emitting efficiency by reflecting light emitted by a light emitting device to the outside are provided.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

An organic light emitting display device according to an embodiment of the present invention is provided. The organic light emitting display device includes a red subpixel, a green subpixel, a blue subpixel, and a white subpixel, and includes a lower substrate. The organic light emitting device is disposed on the lower substrate in each of the red subpixel, green subpixel, blue subpixel, and white subpixel, and includes an anode, an organic light emitting layer disposed on the anode, and a cathode. The upper substrate faces the lower substrate. The color filter is disposed below the upper substrate and includes a red color filter disposed to correspond to the red subpixel, a green color filter disposed to correspond to the green subpixel, and a blue color filter disposed to correspond to the blue subpixel. The external light absorption pattern is disposed within the white subpixel at the bottom of the upper substrate. In the organic light emitting display device according to an embodiment of the present invention, an external light absorption pattern disposed in a white subpixel absorbs external light incident on the white subpixel, thereby reducing external light reflectance.

According to another feature of the present invention, the anode is characterized in that it includes a reflective layer and a transparent conductive layer.

According to another feature of the present invention, it further includes a black matrix arranged to surround each of the red subpixel, green subpixel, blue subpixel, and white subpixel.

According to another feature of the present invention, the external light absorption pattern has the same thickness as the black matrix and is made of the same material as the black matrix.

According to another feature of the present invention, the external light absorption pattern is arranged to have at least one shape among a dot, a line, and a mesh within the white subpixel.

According to another feature of the present invention, the area of the external light absorption pattern is smaller than 1/2 of the light emitting area of the white subpixel.

According to another feature of the present invention, it further includes a lower reflection pattern disposed below the external light absorption pattern.

According to another feature of the present invention, the lower reflective pattern is arranged to completely overlap the lower surface of the external light absorption pattern, and the upper surface of the lower reflective pattern and the lower surface of the external light absorption pattern have the same area.

According to another feature of the present invention, the lower reflective pattern is arranged to cover the lower part of the external light absorption pattern.

According to another feature of the present invention, the lower reflection pattern is characterized by reflecting internal light reaching the lower part of the external light absorption pattern among the light emitted from the organic light emitting layer.

According to another feature of the present invention, the lower reflective pattern includes a metal that reflects internal light.

A method of manufacturing an organic light emitting display device according to another embodiment of the present invention includes sequentially forming an anode, an organic light emitting layer that emits white light, and a cathode to correspond to a red subpixel, a green subpixel, a blue subpixel, and a white subpixel on a lower substrate. forming a black matrix that distinguishes red subpixels, green subpixels, blue subpixels, and white subpixels on the lower part of the upper substrate, forming an external light absorption pattern in the white subpixel on the lower part of the upper substrate, forming a color filter including a red color filter corresponding to the red subpixel, a green color filter corresponding to the green subpixel, and a blue color filter corresponding to the blue subpixel on the lower portion of the substrate and the lower portion of the black matrix, the upper portion It includes the step of bonding the substrate and the lower substrate. By the method of manufacturing an organic light emitting display device according to another embodiment of the present invention, an external light absorption pattern can be disposed simultaneously with a black matrix in a white subpixel, and thus a structure capable of absorbing external light can be disposed in a simpler process. there is.

According to another feature of the present invention, the step of forming an external light absorption pattern and the step of forming a black matrix are performed simultaneously.

According to another feature of the present invention, the method further includes forming a lower reflection pattern below the external light absorption pattern.

According to another feature of the present invention, the step of forming the color filter includes forming a gradient alleviating layer with the same material as one of the red color filter, green color filter, or blue color filter to cover the lower part of the external light absorption pattern. It is characterized by including.

According to another feature of the present invention, the method further includes forming a lower reflection pattern to cover the slope relief layer.

Specific details of other embodiments are included in the detailed description and drawings.

The present invention can manufacture an organic light emitting display device that can reduce high external light reflectance in white subpixels.

In addition, the present invention can manufacture an organic light emitting display device that can compensate for the reduced luminous efficiency of the white subpixel due to a black matrix for reducing external light reflectance in the white subpixel.

The effects according to the present invention are not limited to the contents exemplified above, and further various effects are included in the present specification.

1 is a schematic cross-sectional view illustrating an organic light emitting display device according to an embodiment of the present invention.
Figure 2 is a schematic plan view of a white subpixel of an organic light emitting display device according to an embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view illustrating an organic light emitting display device according to another embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view illustrating an organic light emitting display device according to another embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view illustrating an organic light emitting display device according to another embodiment of the present invention.
FIG. 6 is a schematic cross-sectional view illustrating an organic light emitting display device according to another embodiment of the present invention.
Figure 7 is a flowchart for explaining a method of manufacturing an organic light emitting display device according to an embodiment of the present invention.
8A to 8F are process cross-sectional views for explaining a method of manufacturing an organic light emitting display device according to an embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete and that common knowledge in the technical field to which the present invention pertains is not limited. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative, and the present invention is not limited to the matters shown. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. In cases where a component is expressed in the singular, the plural is included unless specifically stated otherwise.

When interpreting components, it is interpreted to include the margin of error even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., 'immediately' Alternatively, there may be one or more other parts placed between the two parts, unless 'directly' is used.

When an element or layer is referred to as being on another element or layer, it includes all cases where another layer or other element is interposed directly on or in the middle of another element.

Although first, second, etc. are used to describe various elements, these elements are not limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Like reference numerals refer to like elements throughout the specification.

The size and thickness of each component shown in the drawings are shown for convenience of explanation, and the present invention is not necessarily limited to the size and thickness of the components shown.

Each feature of the various embodiments of the present invention can be partially or fully combined or combined with each other, and as can be readily understood by those skilled in the art, various technical interconnections and operations are possible, and each embodiment may be implemented independently of each other. and may be implemented together due to a related relationship.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings.

1 is a schematic cross-sectional view illustrating an organic light emitting display device according to an embodiment of the present invention. Referring to FIG. 1, the organic light emitting display device 100 includes a lower substrate 110, a thin film transistor (TFT), an organic light emitting element 120, an upper substrate 130, a black matrix 140, and a color It includes a filter 150 and an external light absorption pattern 160. Additionally, the organic light emitting display device 100 is a top emission type organic light emitting display device in which light emitted from the organic light emitting element 120 passes through the upper substrate 130.

Referring to FIG. 1 , the organic light emitting display device 100 includes a red subpixel (SPR), a green subpixel (SPG), a blue subpixel (SPB), and a white subpixel (SPW). A subpixel is the basic light emitting unit of an organic light emitting display panel, and depending on the color of light emitted from each subpixel, it is red subpixel (SPR), green subpixel (SPG), blue subpixel (SPB), and white subpixel (SPW). ).

Referring to FIG. 1, a thin film transistor is disposed on the lower substrate 110. An overcoating layer is disposed to cover the thin film transistor, and the organic light emitting device 120 is disposed on the overcoating layer that flattens the top of the thin film transistor (TFT). The organic light emitting device 120 includes an anode 121, an organic light emitting layer 122, and a cathode 123. Here, the organic light-emitting layer 122 is an organic light-emitting layer that emits white light.

Referring to FIG. 1 , since the organic light emitting display device 100 is a top emission type organic light emitting display device, the anode 121 includes a reflective layer and a transparent conductive layer. Accordingly, light emitted from the organic light emitting layer 122 by the reflection layer of the anode 121 and heading toward the lower substrate 110 is reflected upward by the anode 121.

Additionally, the anode 121 is disposed to correspond to each of the red subpixel (SPR), green subpixel (SPG), blue subpixel (SPB), and white subpixel (SPW). Accordingly, the light emitted from the organic light emitting device 120 passes through each of the red subpixel (SPR), green subpixel (SPG), blue subpixel (SPB), and white subpixel (SPW) to produce red, green, and blue colors. Alternatively, it may represent white.

The thin film transistor (TFT) may be electrically connected to the organic light emitting device 120 through the anode 121. Here, the thin film transistor (TFT) is a driving thin film transistor that controls the driving of the organic light emitting device 120. Although only the driving thin film transistor that drives the organic light emitting device 120 is shown in FIG. 1, additional thin film transistors may be further included in each subpixel.

Referring to FIG. 1, a black matrix 140 is disposed under the upper substrate 130. Specifically, the black matrix 140 may be disposed on the lower part of the upper substrate 130 at regular intervals. Additionally, the black matrix 140 may be arranged with a constant width between each subpixel. Accordingly, each subpixel may be defined by the black matrix 140.

The black matrix 140 may be made of photoresist. Accordingly, the black matrix 140 may have a positive taper shape as shown in FIG. 1. The process of creating the tapered shape of the black matrix 140 will be described later with reference to FIG. 8.

The black matrix 140 includes a light-absorbing material and may absorb light. Specifically, the black matrix 140 includes a black material capable of absorbing light in various wavelength ranges. Accordingly, the black matrix 140 can absorb light incident from the top of the upper substrate 130, and is incident on the upper part of the upper substrate 130 to the reflective layer of the anode 121 of the organic light emitting device 120. Light that is reflected and directed back to the upper substrate 130 can also be absorbed, and light emitted from the organic light emitting device 120 between the upper substrate 130 and the lower substrate 110 can be absorbed.

In this way, the black matrix 140 that absorbs light is configured to independently emit light in each of the red subpixel (SPR), green subpixel (SPG), blue subpixel (SPB), and white subpixel (SPW). can be distinguished. That is, the black matrix 140 blocks the light emitted from the organic light emitting device 120 only in each of the red subpixel (SPR), green subpixel (SPG), blue subpixel (SPB), and white subpixel (SPW). Make it glow. Accordingly, the black matrix 140 prevents colors from mixing at the boundaries of each subpixel.

The two-dimensional arrangement and relationship between the subpixels and the black matrix 140 will be described later with reference to FIG. 2 .

Referring to FIG. 1, the color filter 150 is disposed below the upper substrate 130. Specifically, the color filter 150 is disposed between the black matrices 140 at the bottom of the upper substrate 130. Here, the color filter 150 may be arranged to cover a portion of the black matrix 140 and may be arranged to be thicker than the black matrix 140.

In addition, the color filter 150 includes a red color filter 150R disposed to correspond to the red subpixel (SPR), a green color filter 150G disposed to correspond to the green subpixel (SPG), and a blue subpixel (SPB). It includes a blue color filter (150B) arranged to correspond to. Specifically, the red color filter 150R is disposed in the red subpixel (SPR), the green color filter 150G is disposed in the green subpixel (SPG), and the blue color filter 150B is disposed in the blue subpixel (SPB). placed within.

The color filter 150 passes only light corresponding to a specific wavelength range. In particular, the color filter 150 may pass only light corresponding to a specific wavelength region among the light emitted toward the upper substrate 130 within the organic light emitting display device 100. Specifically, the red color filter 150R passes only the light corresponding to the red wavelength region among the light emitted toward the upper substrate 130, and the green color filter 150G passes only the light corresponding to the red wavelength region among the light emitted toward the upper substrate 130. Only light corresponding to the green wavelength region passes through, and the blue color filter 150B passes only light corresponding to the blue wavelength region among the light emitted toward the upper substrate 130.

Additionally, the color filter 150 may pass only light incident on the inside from the outside of the upper substrate 130, corresponding to a specific wavelength range. That is, the red color filter 150R passes only the light corresponding to the red wavelength region among the light incident from the outside of the upper substrate 130, and the green color filter 150G passes through the light incident from the outside of the upper substrate 130. Only light corresponding to the mid-green wavelength range passes through, and the blue color filter 150B passes only light corresponding to the blue wavelength range among the light incident from the outside of the upper substrate 130.

The color filter 150 is not disposed in the white subpixel (SPW). Accordingly, an external light reflection problem occurs in the white subpixel (SPW). Hereinafter, the external light absorption pattern 160 arranged to reduce external light reflection occurring in the white subpixel (SPW) will be described.

The external light absorption pattern 160 is disposed in the white subpixel (SPW) at the bottom of the upper substrate 130. Referring to FIG. 1, the external light absorption pattern 160 may be disposed at the center of the white subpixel (SPW). However, the arrangement of the external light absorption pattern 160 is not limited to the center of the white subpixel (SPW) and is arranged to reduce external light reflectance. Refer to FIG. 2 for various shapes of external light absorption patterns disposed in the white subpixel (SPW).

The external light absorption pattern 160 is made of a material that can absorb light. Preferably, the external light absorption pattern 160 may be made of the same material as the black matrix 140. Additionally, the external light absorption pattern 160 may be disposed to have the same thickness as the black matrix 140. Accordingly, the external light absorption pattern 160 may have the same tapered shape as the black matrix 140. Process characteristics by which the external light absorption pattern 160 and the black matrix 140 can be disposed with the same thickness and the same material will be described with reference to FIGS. 7 and 8.

Since the external light absorption pattern 160 is made of a material capable of absorbing light, the light L1 incident from the top of the upper substrate 130 and the light L1 incident from the top of the upper substrate 130 are absorbed into the organic light emitting device 120. The light (L2) reflected by the reflective layer of the anode 121 and directed back to the upper substrate 130 can be absorbed, and the light emitted from the organic light-emitting device 120 between the upper substrate 130 and the lower substrate 110 can be absorbed. Light (L3) can also be absorbed. The external light absorption pattern 160 is formed by the light L1 incident from the top of the upper substrate 130 and reflected by the reflective layer of the anode 121 of the organic light-emitting device 120 again. By absorbing the light L2 directed toward the upper substrate 130, external light is absorbed, and thus the external light reflectance is reduced.

In the organic light emitting display device 100 according to an embodiment of the present invention, the external light absorption pattern 160 is disposed in the white subpixel (SPW) to reduce external light reflectance. Specifically, since the external light absorption pattern 160 is made of a material capable of absorbing light, the light L1 incident from the top of the upper substrate 130 and the organic light emitting device ( Light L2 that is reflected by the reflective layer of the anode 121 of 120 and is directed back to the upper substrate 130 may be absorbed. In particular, in the white subpixel (SPW), the amount of light L2 that is incident from the upper part of the upper substrate 130, is reflected by the reflective layer of the anode 121 of the organic light emitting device 120, and heads back to the upper substrate 130 is More than in other subpixels. Accordingly, as the external light absorption pattern 160 is disposed in the white subpixel (SPW), L1 and L2, which are light incident from the outside, can be absorbed by the external light absorption pattern 160, so that the external light absorption pattern 160 External light reflectance may be significantly reduced.

Figure 2 is a schematic plan view of a white subpixel of an organic light emitting display device according to an embodiment of the present invention.

Referring to FIG. 2, the black matrix 140 is arranged to surround the white subpixel (SPW). Additionally, the black matrix 140 is arranged to surround each of the red subpixel (SPR), green subpixel (SPG), blue subpixel (SPB), and white subpixel (SPW). That is, the black matrix 140 determines the boundaries of the red subpixel (SPR), green subpixel (SPG), blue subpixel (SPB), and white subpixel (SPW), and colors are mixed at the boundaries of each subpixel. prevent it from happening.

The external light absorption pattern 160 is disposed in the white subpixel (SPW) in various shapes to efficiently suppress external light reflection. Specifically, the external light absorption pattern 160 is disposed in the white subpixel (SPW) to have at least one shape among a dot, a line, and a mesh. For example, as shown in FIG. 2, the external light absorption pattern 160 is the shortest distance connecting the black matrix 140 disposed at the opposite boundary of the white subpixel (SPW). It can be arranged in a line shape.

Although it is shown in FIG. 2 that there is only one linear external light absorption pattern 160, the number of external light absorption patterns 160 is not limited. Accordingly, the external light absorption pattern may be formed by a plurality of lines arranged in the white subpixel (SPW), and a mesh-shaped external light absorption pattern in which a plurality of lines intersect each other may be arranged in the white subpixel (SPW). .

Likewise, the external light absorption pattern 160 may be arranged in a dot shape within the white subpixel (SPW). Specifically, the dot-shaped external light absorption pattern is formed so as not to be connected to the black matrix 140 disposed at the boundary of the white subpixel (SPW). The dot-shaped external light absorption pattern may be formed in a square, circular shape, etc., but the shape of the external light absorption pattern is not limited thereto.

Additionally, the external light absorption pattern 160 is disposed within the white subpixel (SPW) to maximize the aperture ratio of the white subpixel (SPW) while suppressing external light reflection. In order to maximize the aperture ratio of the white subpixel (SPW), the aperture area of the white subpixel (SPW) must be secured to the maximum. Accordingly, the area of the external light absorption pattern 160 should be as small as possible. Preferably, the area of the external light absorption pattern 160 may be smaller than 1/2 of the light emitting area of the white subpixel (SPW).

Here, the shape or area of the external light absorption pattern 160 is described as an example and is not limited thereto, and the external light absorption pattern 160 may be arranged in various shapes or areas within the white sub-pixel (SPW).

In the organic light emitting display device 100 according to an embodiment of the present invention, the external light absorption pattern 160 has various shapes or areas and is disposed within the white subpixel (SPW) to reduce external light reflectance. Specifically, the external light absorption pattern 160 may be arranged in the shape of at least one of one or more dots, lines, and meshes within the white subpixel (SPW) to maximize external light absorption. Additionally, the external light absorption pattern 160 may be arranged to be smaller than 1/2 of the light emitting area of the white subpixel (SPW) in order to secure the aperture ratio of the white subpixel (SPW). Here, the external light absorption pattern 160 can also absorb light emitted from the organic light emitting device 120, and if the external light absorption pattern 160 is too small, it may be difficult to reduce the external light reflectance, so it may be difficult to reduce the external light reflectance within the white subpixel (SPW). The shape and area of the external light absorption pattern 160 may be appropriately selected to minimize external light reflectance. Accordingly, the external light absorption pattern 160 may be arranged in various combinations of shapes and areas to minimize external light reflectance within the white subpixel (SPW).

FIG. 3 is a schematic cross-sectional view illustrating an organic light emitting display device according to another embodiment of the present invention. The organic light emitting display device 300 of FIG. 3 has only a lower reflection pattern 370 added compared to the organic light emitting display device 100 of FIG. 1, and other configurations are substantially the same, so duplicate descriptions will be omitted.

Referring to FIG. 3, the lower reflective pattern 370 is disposed below the external light absorption pattern 160. Specifically, the lower reflective pattern 370 is arranged to completely overlap the lower surface of the external light absorption pattern 160. Additionally, the lower reflective pattern 370 is disposed on the lower surface of the external light absorption pattern 160 so that the upper surface of the lower reflective pattern 370 and the lower surface of the external light absorption pattern 160 have the same area. That is, the lower reflective pattern 370 is disposed along the shape of the lower surface of the external light absorption pattern 160, and the lower surface of the lower reflective pattern 370 may be flat.

The lower reflective pattern 370 may reflect light toward the external light absorption pattern 160 within the white subpixel (SPW). Specifically, among the light emitted from the organic light emitting layer 122, the internal light L4 reaching the lower part of the external light absorption pattern 160 is reflected. Referring to FIG. 3 , the lower reflection pattern 370 reflects the internal light L4 reaching the lower part of the external light absorption pattern 160 and directs it toward the anode 121 of the organic light emitting device 120. Here, since the anode 121 includes a reflective layer, the internal light L4 reflected from the lower reflective pattern 370 travels toward the upper substrate 130 again. Accordingly, the lower reflection pattern 370 reflects the internal light L4 that reaches the lower part of the external light absorption pattern 160 among the light emitted from the organic light emitting layer 122, and the internal light L4 is absorbed by the external light absorption pattern 160. (L4) is not absorbed.

The lower reflective pattern 370 includes a material that reflects light. Specifically, the lower reflective pattern 370 includes a material with high light reflectance. Preferably, the lower reflective pattern 370 may include a metal with high light reflectivity.

The shapes of various lower reflection patterns will be described later with reference to FIGS. 4 to 6.

In the organic light emitting display device 300 according to an embodiment of the present invention, the lower reflective pattern 370 reflects internal light toward the external light absorption pattern 160, thereby improving the luminous efficiency of the white subpixel (SPW). Specifically, the lower reflection pattern 370 is arranged to completely overlap the lower surface of the external light absorption pattern 160, so that the internal light L4 directed to the external light absorption pattern 160 among the light emitted from the organic light emitting layer 122 is again It is reflected toward the anode (121). Here, since the anode 121 includes a reflective layer, the internal light L4 may travel toward the upper substrate 130 again and be emitted to the outside. Accordingly, the lower reflection pattern 370 reflects the light emitted from the organic light-emitting layer 122, which may be absorbed by the external light absorption pattern 160, and therefore the light emitted from the organic light-emitting layer 122 is a white subpixel (SPW). ) increases the probability of being released to the outside through the opening. That is, the luminous efficiency of the white bus pixel (SPW) can be improved by the lower reflective pattern 370 disposed below the external light absorption pattern 160.

FIG. 4 is a schematic cross-sectional view illustrating an organic light emitting display device according to another embodiment of the present invention. Compared to the organic light emitting display device 300 of FIG. 3, only the shape of the lower reflection pattern 470 of the organic light emitting display device 400 of FIG. 4 is changed, and other configurations are substantially the same, so redundant description will be omitted. .

Referring to FIG. 4 , the lower reflective pattern 470 is disposed to cover the lower portion of the external light absorption pattern 160 . Specifically, the lower reflective pattern 470 may completely cover the lower portion of the external light absorption pattern 160. Additionally, the lower reflective pattern 470 may be disposed conformally along the lower shape of the external light absorption pattern 160.

If the lower reflective pattern 470 is disposed to completely cover the lower part of the external light absorption pattern 160, light emitted from the organic light emitting layer 122 is not absorbed by the external light absorption pattern 160. Specifically, all light reaching the lower part of the external light absorption pattern 160 is incident on the lower reflection pattern 470. Accordingly, the lower reflection pattern 470 not only includes internal light that reaches the lower surface of the external light absorption pattern 160 among the light emitted from the organic light emitting layer 122, but also reaches the side of the tapered external light absorption pattern 160. Internal light can also be reflected.

Additionally, when the lower reflective pattern 470 is arranged conformally along the lower shape of the external light absorption pattern 160, the lower reflective pattern 470 includes a side surface with a different inclination from the lower surface. Accordingly, the lower reflective pattern 470 may reflect internal light at various angles through the side surface of the lower reflective pattern 470. Due to the side surface of the lower reflection pattern 470, a portion L5 of the internal light emitted from the organic light emitting layer 122 may not be reflected back toward the organic light emitting device 120 but may be directly reflected outside. Accordingly, the lower reflection pattern 470 may directly emit a portion of the internal light L5 through the inclined side surface according to the shape of the external light absorption pattern 160.

Accordingly, the internal light is not absorbed by the external light absorption pattern 160, but is reflected by the lower reflection pattern 470, and the light emitted from the white subpixel (SPW) increases.

In the organic light emitting display device 400 according to another embodiment of the present invention, the luminous efficiency in the white subpixel (SPW) can be increased by the lower reflective pattern 470 disposed to cover the lower part of the external light absorption pattern 160. there is. Specifically, since the lower reflective pattern 470 is arranged to completely cover the lower part of the external light absorption pattern 160, all light incident on the lower part of the lower reflective pattern 470 among the light emitted from the organic light-emitting layer 122 is reflected. It can be. Accordingly, the light emitted from the organic light emitting layer 122 is not absorbed by the external light absorption pattern 160 but is all reflected, thereby increasing the probability that the light is emitted to the outside from the white subpixel (SPW). That is, as the lower reflective pattern 470 is arranged to completely cover the lower part of the external light absorption pattern 160, luminous efficiency in the white subpixel (SPW) can be improved.

Additionally, in the organic light emitting display device 400, a portion of the light emitted from the organic light emitting layer 122 is reflected by the lower reflection pattern 470 disposed along the shape of the external light absorption pattern 160 and may be directly emitted to the outside. . Specifically, the external light absorption pattern 160 is disposed in a positive tapered shape on the lower surface of the upper substrate 130, and the lower reflective pattern 470 arranged to completely cover the external light absorption pattern 160 is the external light absorption pattern 160. It is arranged conformally according to the shape of . Because of this, the lower reflective pattern 470 may form a side surface that is inclined compared to the lower surface. Accordingly, among the light emitted from the organic light emitting layer 122, the light incident on the side of the lower reflection pattern 470 is not reflected toward the organic light emitting element 120 but is reflected toward the outside of the organic light emitting display device 400. . That is, the lower reflective pattern 470 may directly emit some of the light emitted from the organic light emitting layer 122 to the outside of the organic light emitting display device 400.

FIG. 5 is a schematic cross-sectional view illustrating an organic light emitting display device according to another embodiment of the present invention. Compared to the organic light emitting display device 100 of FIG. 4, the organic light emitting display device 500 of FIG. 5 has only a changed shape of the lower reflection pattern 570 and an added tilt relief layer 580, and other configurations are as follows. Since they are substantially the same, duplicate descriptions are omitted.

Referring to FIG. 5 , the slope alleviating layer 580 is disposed to cover the lower portion of the external light absorption pattern 160 . Specifically, the slope alleviating layer 580 may be disposed to completely cover the lower portion of the external light absorption pattern 160.

The gradient alleviating layer 580 may be made of the same material as the color filter 150. Specifically, the gradient alleviating layer 580 may be formed of the same material as one of the red color filter 150R, green color filter 150G, or blue color filter 150B. However, the gradient alleviating layer 580 may be formed in a different shape from the color filter 150. That is, as the slope relaxation layer 580 is disposed to completely cover the lower part of the external light absorption pattern 160, the slope relaxation layer 580 may form a convex portion. For example, the gradient relaxation layer 580 may have the shape of a portion of a sphere.

As shown in FIG. 5 , the tilt alleviating layer 580, which is arranged to cover the lower portion of the external light absorption pattern 160 and has a round shape, provides various tilts to the lower reflective pattern 570. Specifically, since the tilt alleviating layer 580 includes a surface that is not a plane, the tilt alleviating layer 580 alleviates the change in inclination between the plane and the side surface of the external light absorption pattern 160. The slope alleviating layer 580 includes a curved surface at the bottom, and the slope of the tangent or tangential surface gradually changes continuously at each point of the curved surface. That is, various tangent lines or contact surfaces may exist at each point where light enters the lower part of the gradient relaxation layer 580. Accordingly, if a reflective material is disposed below the gradient relaxation layer 580, light incident on the bottom of the gradient relaxation layer 580 may be reflected at various angles.

Referring to FIG. 5 , the lower reflective pattern 570 is disposed to cover the lower portion of the slope alleviating layer 580 . Specifically, the lower reflective pattern 570 may be arranged to completely cover the lower portion of the slope relaxation layer 580.

Referring to FIG. 5 , the lower reflective pattern 570 may be formed conformally according to the shape of the lower part of the slope alleviating layer 580 . The shape of the lower part of the lower reflective pattern 570 may be determined according to the shape of the slope relaxation layer 580. The lower reflection pattern 570 includes a non-planar surface along the shape of the lower portion of the slope alleviating layer 580, which is not planar. That is, the lower reflective pattern 570 may include a curved surface at the bottom. Accordingly, the lower reflection pattern 570, like the gradient relaxation layer 580, may have a different tangent line or surface at each point where light emitted from the organic light emitting layer 122 enters.

Since the lower part of the lower reflective pattern 570 is formed according to the shape of the lower part of the slope alleviating layer 580, the lower part of the lower reflective pattern 570 may have various tangent lines or contact surfaces. Accordingly, the light L6 incident on the lower part of the lower reflection pattern 570 may have a different angle of incidence and reflection with respect to the tangent or tangential surface at each incident point. That is, the lower reflective pattern 570 may reflect the light L6 emitted from the organic emission layer 122 and incident on the lower part of the lower reflective pattern 570 in various directions.

There are various tangents or contact surfaces on the lower surface of the lower reflection pattern 570 depending on the shape of the slope relaxation layer 580, and the lower reflection pattern 570 detects the light L6 incident on the lower part of the lower reflection pattern 570. It can be reflected in various directions. Accordingly, the light L6 incident on the lower reflection pattern 570 is reflected in various directions and has a higher probability of passing through the opening of the white subpixel (SPW).

In the organic light emitting display device 500 according to another embodiment of the present invention, the lower reflective pattern 570 arranged according to the shape of the slope relaxation layer 580 can improve the luminous efficiency of the white subpixel (SPW). Specifically, the lower reflective pattern 570 disposed to cover the slope alleviating layer 580, whose lower portion is a curved surface rather than a flat surface, may have various tangent lines or tangential surfaces. Accordingly, the lower surface of the lower reflective pattern 570 can reflect the light L6 incident on the lower part of the lower reflective pattern 570 in various directions, and the light L6 incident on the lower part of the lower reflective pattern 570 ) also increases the probability that the white subpixel (SPW) will be emitted to the outside. That is, as the lower reflective pattern 570 is arranged to cover the gradient relaxation layer 580 along the shape of the gradient relaxation layer 580 including a curved surface, luminous efficiency in the white subpixel (SPW) can be improved. .

FIG. 6 is a schematic cross-sectional view illustrating an organic light emitting display device according to another embodiment of the present invention. Compared to the organic light emitting display device 500 of FIG. 5, the organic light emitting display device 600 of FIG. 6 has a first external light absorption pattern 661, a second external light absorption pattern 662, and a first gradient relaxation layer 681. and the second slope alleviating layer 682 are added or changed, and the shape of the lower reflective pattern 670 is changed, but other configurations are substantially the same, so duplicate descriptions will be omitted.

Referring to FIG. 6 , the first external light absorption pattern 661 and the second external light absorption pattern 662 are disposed in the white subpixel (SPW) at the lower part of the upper substrate 130. Specifically, the first external light absorption pattern 661 and the second external light absorption pattern 662 may be disposed on the lower part of the upper substrate 130 adjacent to each other.

As the first external light absorption pattern 661 and the second external light absorption pattern 662 are arranged adjacent to each other, the probability that light incident from the top of the upper substrate 130 can be absorbed increases. Specifically, since the area where the first external light absorption pattern 661 and the second external light absorption pattern 662 are disposed on the lower surface of the upper substrate 130 is expanded, the first external light absorption pattern 661 and the second external light absorption pattern 662 662 may absorb more light incident from the top of the upper substrate 130. Accordingly, the external light reflectance of the organic light emitting display device 600 may be greatly reduced.

Referring to FIG. 6, the first gradient alleviating layer 681 is disposed to cover the lower part of the first external light absorption pattern 661, and the second gradient alleviating layer 682 is disposed to cover the lower part of the second external light absorption pattern 682. It is placed to cover. Accordingly, the first slope relaxation layer 681 may be disposed to completely cover the lower part of the first external light absorption pattern 661, and the second slope relaxation layer 682 may be arranged to completely cover the lower part of the second external light absorption pattern 662. It can be placed to completely cover. Additionally, the first gradient alleviating layer 681 and the second gradient alleviating layer 682 may be disposed separately from each other, and the first gradient alleviating layer 681 and the second gradient alleviating layer 682 may be connected to one another. A slope relief layer may be formed.

The first gradient alleviating layer 681 and the second gradient alleviating layer 682 may be made of the same material as the color filter 150. Specifically, the first gradient alleviating layer 681 and the second gradient alleviating layer 682 may be formed of the same material as one of the red color filter 150R, green color filter 150G, or blue color filter 150B. there is. Here, the first tilt alleviating layer 681 and the second tilt alleviating layer 682 may be formed of a color filter material of the same color, or may be formed of a color filter material of a different color.

Referring to FIG. 6, as the first gradient alleviating layer 681 is disposed to cover the lower part of the first external light absorption pattern 661, the first gradient alleviating layer 681 is the first external light absorption pattern 661. A convex portion is formed at the bottom. In addition, as the second gradient alleviating layer 682 is disposed to cover the lower part of the second external light absorption pattern 662, the second gradient alleviating layer 682 forms a convex portion on the lower part of the second external light absorption pattern 662. form Accordingly, the first slope relaxation layer 681 relaxes the slope of the first external light absorption pattern 661, and the second slope relaxation layer 682 relaxes the slope of the second external light absorption pattern 662.

Referring to FIG. 6 , the lower reflective pattern 670 is disposed to cover the lower part of the first slope alleviating layer 681 and the lower part of the second slope alleviating layer 682 . Specifically, the lower reflective pattern 670 may be arranged to completely cover the lower part of the first slope alleviating layer 681 and the lower part of the second slope alleviating layer 682. In addition, when the first gradient alleviating layer 681 and the second gradient alleviating layer 682 are disposed separately, the lower reflection pattern 670 is formed by the first gradient alleviating layer 681 and the second gradient alleviating layer 682. It may be arranged to cover this separated portion.

Referring to FIG. 6 , the lower reflective pattern 670 may be formed conformally along the shape of the lower part of the first slope alleviating layer 681 and the lower part of the second slope alleviating layer 682 . Accordingly, the lower reflection pattern 670 includes a plurality of convex portions facing the organic light emitting device 120 according to the shape of the lower part of the first tilt relaxed layer 681 and the lower part of the second tilt relaxed layer 682. can do. In addition, when the first gradient alleviating layer 681 and the second gradient alleviating layer 682 are disposed separately, the lower reflection pattern 670 is formed by the first gradient alleviating layer 681 and the second gradient alleviating layer 682. A recess may be included corresponding to this separated portion.

Since the lower reflective pattern 670 includes convex portions and concave portions, the lower portion of the lower reflective pattern 670 may have various tangent lines or contact surfaces. Accordingly, the lower reflective pattern 670 can reflect the light L7 incident on the lower part of the lower reflective pattern 670 in various directions through the convex portion and the concave portion. Accordingly, the light L7 incident on the lower reflective pattern 570 is reflected in various directions by the convex and concave parts of the lower reflective pattern 670, increasing the probability of passing through the opening of the white subpixel (SPW). .

In the organic light emitting display device 600 according to another embodiment of the present invention, the external light reflectance can be greatly reduced by the first external light absorption pattern 661 and the second external light absorption pattern 662. Specifically, since the area of the surface of the first external light absorption pattern 661 and the second external light absorption pattern 662 is in contact with the upper substrate 130, the external light incident from the top of the upper substrate 130 is the first external light. The probability of reaching the absorption pattern 661 and the second external light absorption pattern 662 increases. Accordingly, external light incident from the top of the upper substrate 130 is absorbed by the first external light absorption pattern 661 and the second external light absorption pattern 662, and the external light reflectance in the organic light emitting display device 600 increases. can be reduced.

In addition, the organic light emitting display device 600 includes a first gradient alleviating layer 681, a second gradient alleviating layer 682, and Light emission efficiency is improved in the white subpixel (SPW) by the lower reflection pattern 670. Specifically, the lower reflection pattern 670 is formed to cover both the first slope relaxation layer 681 and the second slope relaxation layer 682 having a curved surface, so that the first slope relaxation layer 681 and the second slope relaxation layer 682 are formed. Along the shape of layer 682, lower reflective pattern 670 includes convex portions and concave portions. Accordingly, the light L7 incident on the lower part of the lower reflective pattern 670 may be reflected in various directions by the convex and concave parts of the lower reflective pattern 670. Accordingly, the probability of light reflected by the convex and concave portions of the lower reflection pattern 670 passing through the opening of the white subpixel (SPW) increases, and luminous efficiency in the white subpixel (SPW) can be improved.

Figure 7 is a flowchart for explaining a method of manufacturing an organic light emitting display device according to an embodiment of the present invention. 8A to 8F are process cross-sectional views for explaining a method of manufacturing an organic light emitting display device according to an embodiment of the present invention. FIGS. 8A to 8F are process cross-sectional views for explaining the manufacturing method of the organic light emitting display device 500 shown in FIG. 5 , and redundant descriptions of components described with reference to FIG. 5 are omitted.

First, the anode 121, the organic light emitting layer 122 that emits white light, and the cathode 123 are formed on the lower substrate 110 by forming a red subpixel (SPR), a green subpixel (SPG), a blue subpixel (SPB), and It is sequentially formed to correspond to the white subpixel (SPW) (S71).

Referring to FIG. 8A , a thin film transistor (TFT) may be disposed on the lower substrate 110 to correspond to each subpixel, and an overcoating layer may be formed to cover the thin film transistor (TFT). Anodes 121 are disposed on the lower substrate 110 to correspond to each of the red subpixel (SPR), green subpixel (SPG), blue subpixel (SPB), and white subpixel (SPW). Next, a bank layer that separates each subpixel is formed, and the organic light emitting layer 122 and the cathode 123 are sequentially stacked on the bank layer and the anode 121.

Next, a black matrix material 849 is disposed under the upper substrate 130.

Referring to FIG. 8B, a black matrix material 849 is disposed at a constant thickness on the entire lower surface of the upper substrate 130. Specifically, the black matrix material 849 may be a material whose properties change depending on the irradiated light. For example, the black matrix material 849 may be a photoresist.

Next, the black matrix 140 is formed under the upper substrate 130 to distinguish the red subpixel (SPR), green subpixel (SPG), blue subpixel (SPB), and white subpixel (SPW) (S72) . Next, the external light absorption pattern 160 is formed in the white subpixel (SPW) below the upper substrate 130 (S73).

Referring to FIG. 8C, the black matrix 140 is formed to distinguish each subpixel from the black matrix material 849. Specifically, the black matrix 140 may be formed through a photolithography process. The black matrix 140 is formed by patterning the black matrix material 849 through a photolithography process to leave a desired portion or remove an unwanted portion. Here, the black matrix 140 may have various shapes depending on the photolithography process and the properties of the black matrix material 849. For example, the black matrix 140 may have a positive taper shape as shown in FIG. 8C.

Here, forming the external light absorption pattern 160 and forming the black matrix 140 may be performed simultaneously. Specifically, the black matrix 140 and the external light absorption pattern 160 may be formed simultaneously from the black matrix material 849 through a single photolithography process. That is, the black matrix 140 and the external light absorption pattern 160 can be formed simultaneously in a single photolithography process by patterning the black matrix material 849. Accordingly, the black matrix 140 and the external light absorption pattern 160 may be formed of the same material, and may have the same shape and the same thickness.

Subsequently, the color filter 150 is provided under the upper substrate 130 and a portion of the black matrix 140, including a red color filter 150R corresponding to the red subpixel (SPR) and a green subpixel (SPG) corresponding to the green subpixel (SPG). It is formed to include a green color filter 150G and a blue color filter 150B corresponding to a blue subpixel (SPB) (S74).

Referring to FIG. 8D, a color filter 150 is disposed below the upper substrate 130 in response to each subpixel. Here, the color filter 150 may not be disposed in the white subpixel (SPW).

The gradient relief layer 580 is made of the same material as one of the red color filter 150R, green color filter 150G, or blue color filter 150B so that it covers the lower part of the external light absorption pattern 160 within the white subpixel (SPW). It can be formed as Specifically, the gradient relaxation layer 580 is a red color filter 150R to cover the external light absorption pattern 160 within the white subpixel (SPW) when the color filter 150 is disposed corresponding to each subpixel. Materials can be placed. In FIG. 8D, the gradient relaxation layer 580 is shown as being made of a red color filter 150R material, but the material of the gradient relaxation layer 580 is not limited thereto. Here, the gradient alleviating layer 580 may be arranged to cover the external light absorption pattern 160 and may include a convex portion. Accordingly, the slope relief layer 580 is simultaneously formed of the same material as one of the red color filter 150R, green color filter 150G, or blue color filter 150B, and is formed on the plane and side surface of the external light absorption pattern 160. The slope can be eased.

Subsequently, the lower reflective pattern 570 is formed to cover the slope relaxation layer 580.

Referring to FIG. 8E, the lower reflective pattern 570 is formed to completely cover the lower portion of the gradient relaxation layer 580 within the white subpixel (SPW). Accordingly, the lower reflective pattern 570 is formed along the convex portion of the slope relaxation layer 580, and thus the lower reflective pattern 570 also includes the convex portion. Accordingly, the lower reflective pattern 570 may have various shapes depending on the shape of the slope relaxation layer 580.

Next, the upper substrate 130 and the lower substrate 110 are bonded (S75).

Referring to FIG. 8F, the upper substrate 130 has a portion where the external light absorption pattern 160, the slope relaxation layer 580, and the lower reflection pattern 570 are disposed within the white subpixel (SPW) on the lower substrate 110. It is adhered to face the organic light emitting device 120. Accordingly, each organic light emitting device 120 is arranged to correspond to each subpixel.

In the organic light emitting display device manufacturing method according to an embodiment of the present invention, the external light absorption pattern 160 may be formed simultaneously with the black matrix 140. Specifically, the external light absorption pattern 160 may be formed by patterning the black matrix material 849 to have the same thickness and shape as the black matrix 140 through a single photolithography process. The external light absorption pattern 160 may be arranged in various shapes within the white subpixel (SPW) depending on the method of patterning the black matrix material 849. Accordingly, the external light absorption pattern 160 can be formed simultaneously with the black matrix 140 through a process for generating the black matrix 140 without a separate process, and can be arranged in various shapes depending on the patterning method.

Additionally, in the method of manufacturing an organic light emitting display device according to an embodiment of the present invention, the tilt relief layer 580 is made of the same material as one of the red color filter 150R, green color filter 150G, or blue color filter 150B. can be formed. That is, the gradient alleviating layer 580 may be formed simultaneously with the color filter 150 through the process of forming the color filter 150 .

Although embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

100, 300, 400, 500, 600: Organic light emitting display device
110: lower substrate
120: Organic light emitting device
121: anode
122: Organic light-emitting layer
123: cathode
130: upper substrate
140: Black Matrix
150: Color filter
160: External light absorption pattern
370, 470, 570, 670: Lower reflection pattern
580: Slope relief layer
661: First external light absorption pattern
662: Second external light absorption pattern
681: First slope relief layer
682: Second slope relief layer
849: Material for black matrix

Claims (25)

Thin film transistors disposed in a plurality of subpixels on a substrate;
an organic insulating film disposed on the thin film transistor to planarize it;
an anode disposed on the organic insulating film and including a reflective layer and a transparent conductive layer;
a bank disposed on the anode and the organic insulating film and directly contacting and overlapping a portion of the upper surface of the anode;
an organic light-emitting layer and a cathode disposed on the anode;
a plurality of color filters disposed on the cathode and corresponding to light-emitting areas of the plurality of subpixels;
a black matrix arranged to overlap the bank;
at least one external light absorption pattern disposed to at least partially overlap a light emitting area of at least one subpixel among the plurality of subpixels; and
It includes a gradient alleviating layer that at least partially overlaps the external light absorption pattern,
The plurality of color filters are spaced apart from each other, and some areas overlap with the black matrix,
The bank partially overlaps the thin film transistor,
Some areas of the bank and the plurality of color filters overlap,
The organic light emitting display device wherein the gradient alleviating layer is disposed to cover a lower portion of the external light absorption pattern. According to claim 1,
An organic light emitting display device, wherein the cathode is made of a transparent electrode. According to claim 1,
The plurality of color filters are:
An organic light emitting display device whose width becomes narrower toward the top in areas not in contact with the black matrix. According to claim 1,
The external light absorption pattern is disposed on a white subpixel among the plurality of subpixels. According to clause 4,
The external light absorption pattern is formed on the same layer as the black matrix and has the same tapered shape as the black matrix. According to clause 4,
The organic light emitting display device wherein the external light absorption pattern has the same thickness and is made of the same material as the black matrix. According to clause 4,
An organic light emitting display device, wherein the external light absorption pattern partially overlaps the light emitting area of the white subpixel. According to clause 7,
The external light absorption pattern is disposed at the center of the white subpixel. According to clause 7,
The organic light emitting display device wherein the external light absorption pattern is arranged to have at least one shape among a dot, a line, and a mesh within the white subpixel. According to clause 4,
An organic light emitting display device, wherein the gradient alleviation layer is disposed in a white subpixel. delete According to claim 1,
The organic light emitting display device further includes a lower reflective pattern disposed below the gradient relaxation layer to cover the gradient relaxation layer. According to claim 1,
An organic light emitting display device wherein the organic light emitting layer or the cathode is disposed on the bank. According to claim 1,
The organic light emitting layer has at least one common layer commonly disposed in the plurality of subpixels. According to claim 1,
An organic light emitting display device, wherein the plurality of subpixels are spaced apart from each other at equal intervals.
According to claim 1,
The thin film transistor includes a semiconductor layer, a gate electrode, a source electrode, and a drain electrode,
An organic light emitting display device, wherein the organic insulating film is disposed on the source electrode and the drain electrode. According to claim 16,
The organic light emitting display device is disposed to directly contact the source electrode and the drain electrode. According to claim 1,
An organic light emitting display device, wherein the color filter has a width greater than the anode. According to claim 1,
The width of the black matrix corresponds to the gap between the anodes of each subpixel. According to claim 1,
An organic light emitting display device wherein the width of the black matrix is smaller than the width of the bank. According to claim 1,
The organic light emitting display device wherein the gradient alleviating layer is made of the same material as the color filter. According to claim 1,
The organic light emitting display device wherein the slope alleviating layer contacts a lower surface and an entire side surface of the external light absorption pattern. According to claim 1,
An organic light emitting display device, wherein the slope alleviating layer has a round shape. According to claim 12,
The organic light emitting display device wherein the lower reflection pattern is conformally formed along the lower shape of the slope relaxation layer. According to claim 12,
The organic light emitting display device wherein the lower reflection pattern includes a non-flat surface along the shape of the lower part of the slope relaxation layer.