KR102151609B1 - Display apparatus and manufacturing method of the same - Google Patents

Abstract

According to an embodiment of the present invention, a display device having a reduced reflectance for external light is provided. The color filter overlapping part is formed in the black matrix area defined by the black matrix, and the color filter overlapping part is formed to overlap in the order of blue color filter, red color filter, and green color filter, preventing color mixing and reducing reflection of external light. have.

Description

Display device and manufacturing method thereof {DISPLAY APPARATUS AND MANUFACTURING METHOD OF THE SAME}

The present invention relates to a display device and a method for manufacturing the same, and more particularly, to provide a display device and a method of manufacturing the same, which can increase visibility by reducing the reflectance of external light while being slim.

Recently, display devices such as a liquid crystal display (LCD) and an organic light-emitting diode display (OLED) are in the spotlight as flat panel display devices. In particular, display devices including an organic light emitting diode do not require a separate light source, and thus have an advantage of having excellent power consumption and realizing clearer image quality.

A display device using an organic light-emitting diode is implemented by forming a transistor and an organic light-emitting layer on a substrate. When a white organic light-emitting device is used as an organic light-emitting device, a color filter is provided on an upper plate to express colors.

In this way, a display device using a white organic light emitting diode is formed in a structure of 3 sub-pixels of red, green, and blue by using a color filter to express colors, or in a 3 sub-pixel structure. A 4 sub pixel structure may also be formed by adding a white sub pixel.

When a color is implemented by adding a white subpixel to the three color subpixels of red, green, and blue, it is advantageous to reduce power consumption of the display device because it is not necessary to drive all subpixels to produce white color.

In addition, in general, a polarizing plate is attached to improve external visibility by lowering the reflectance of external light of the display device.

However, since the polarizing plate is thick and does not bend well, there is a problem of increasing the thickness and manufacturing cost of the display device, and at the same time, it is difficult to implement a flexible display.

[Related technical literature]

1. Cholesteric liquid crystal color filter and its manufacturing method (Patent Application No. 10-2001-0028401)

In a display device using a white organic light emitting device, a color filter and a black matrix are formed on a first substrate side, an organic light emitting device is formed on a second substrate side, and a display device is formed by bonding the first and second substrates. Is implemented.

Specifically, a transistor (TFT; Thin Film Transistor) is formed on the second substrate side, and a pixel electrode, an organic light emitting layer, and a common electrode are formed on the transistor, and the organic light emitting layer is formed with holes and electrons injected through the common electrode and the pixel electrode. Emits light.

Meanwhile, a color filter layer is formed on the side of the first substrate to transmit light emitted from the organic emission layer through the color filter layer to express colors.

In such a display device, a polarizing plate is attached to the outer surface of the first substrate in order to improve visibility by lowering reflectance of external light.

The polarized light has the effect of first reducing light reflection for external light and secondly reducing the light reflected by the transmitted external light by internal devices.

However, when a polarizing plate is used, there is a problem in implementing a flexible and thin display device due to the high manufacturing cost and the characteristics of the polarizing plate not being bent well.

Accordingly, the problem to be solved of the present invention is an improved display device and manufacturing method capable of reducing the reflectance of external light in a display device using an organic light emitting device, reducing the thickness of the display device, and implementing a flexible display device. Is to provide.

The problems to be solved according to an embodiment of the present invention are not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, a display device including a color filter layer defined as a red color filter, a green color filter, and a blue color filter on a first substrate is provided.

The black matrix is formed on the color filter layer, and the color filter layer in the black matrix region corresponding to the black matrix includes a color filter overlapping portion in which a red color filter, a green color filter, and a blue color filter are overlapped.

In relation to the reflectance of each light of the blue color filter, red color filter, and green color filter, the color filter overlapping portion has the lowest reflectance of the blue color filter, and the reflectance increases in the order of the red color filter and the green color filter. .

According to another feature of the present invention, the color filter overlapping portion is characterized in that the first substrate overlaps in the order of a blue color filter having a low reflectance, a red color filter, and a green color filter.

According to another feature of the present invention, the thickness of the color filter overlapping portion is characterized in that the overlapped to a thickness of 4 ~ 6 ㎛.

According to another feature of the present invention, it is characterized in that filling between the color filter layer and the black matrix.

According to still another feature of the present invention, a second substrate including a plurality of light emitting devices facing the first substrate is included, and the plurality of light emitting devices are organic light emitting devices.

According to another feature of the present invention, a subpixel defined by a black matrix and a light emitting element is included, and the subpixel includes a white subpixel.

The color filter overlapping portion of the first substrate serves to reduce reflectance of external light incident on the first substrate and prevent color mixture of light emitted from the second substrate.

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

According to an exemplary embodiment of the present invention, reflectance of external light of the display device may be reduced by increasing the area occupied by the blue color filter rather than the area occupied by the red and green color filters. In addition, by providing a color filter overlapping portion in the black matrix area, there is an effect of lowering reflectance of external light and preventing color mixing of the display device.

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

Since the contents of the invention described in the problems to be solved above, the problem solving means, and effects do not specify essential features of the claims, the scope of the claims is not limited by the matters described in the contents of the invention.

1 is a schematic cross-sectional view of a display device in which reflectance of external light including a color filter overlapping portion is reduced according to an exemplary embodiment of the present invention.
2 is a schematic cross-sectional view of a display device having an RGB structure including a color filter overlapping portion according to another embodiment of the present invention.
3A to 3F are schematic cross-sectional views of a manufacturing method according to an embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms different from each other, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have it, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are exemplary, and the present invention is not limited to the illustrated matters. The same reference numerals refer to the same components throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. When'include','have','consists of' and the like mentioned in the specification are used, other parts may be added unless'only' is used. In the case of expressing the constituent elements in the singular, it includes the case of including the plural unless specifically stated otherwise.

In interpreting the constituent elements, it is interpreted as including an error range even if there is no explicit description.

In the case of a description of the positional relationship, for example, if the positional relationship of two parts is described as'upper','upper of','lower of','next to','right' Or, unless'direct' is used, one or more other parts may be located between the two parts.

In the case of a description of a temporal relationship, for example,'after','following','after','before', etc. It may also include cases that are not continuous unless' is used.

First, second, etc. are used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one component from another component. Accordingly, the first component mentioned below may be a second component within the technical idea of the present invention.

Each of the features of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments can be implemented independently of each other or can be implemented together in a related relationship. May be.

Hereinafter, a structure of a color filter segment and a black matrix for reducing reflectance of external light of a white subpixel according to an embodiment of the present invention will be described.

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

1 is a schematic cross-sectional view of a display device in which reflectance of external light including a color filter overlapping portion is reduced according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a display device 100 including a color filter layer 120 on a first substrate 110 is provided.

A TFT 170 is formed on the second substrate 160, and an insulating layer 180, a bank 220, and a pixel electrode 190 are formed on the TFT 170.

The second substrate 160 may include any one of glass, plastic, and metal. It may include a protective layer that prevents the penetration of oxygen and moisture.

An organic emission layer 200 is formed on the pixel electrode 190 and a common electrode 210 is formed on the organic emission layer 200. The pixel electrode 190 may serve as a reflector for light generated from the organic emission layer 200 when the display device 100 is in a top emission type.

The organic emission layer 200 emits light by holes and electrons injected through the common electrode 210 and the pixel electrode 190.

Although the organic light-emitting layer 200 is omitted in FIG. 1 and is briefly shown, in order to increase the luminous efficiency and stability of the organic light-emitting layer 200, it may be formed in a multilayer structure made of different materials. For example, a hole injection layer, a hole transport layer, and a light-emitting layer , An electron transport layer, an electron injection layer, and the like.

The color filter layer 120 is formed on the first substrate 110, and light emitted from the organic light emitting layer 200 on the second substrate is transmitted through the color filter layer 120 so that the display device 100 displays colors.

Referring to FIG. 1, the display apparatus 100 includes sub-pixels divided into W, R, G, and B regions.

The color filter layer 120 includes a blue color filter 121, a red color filter 122, a green color filter 123, and a color filter overlapping portion 130.

An overcoat layer 140 is formed on the color filter layer 120 and a black matrix 150 is formed on the overcoat layer 140.

The color filter layer 120 of the black matrix region 151 defined by the black matrix 150 includes a color filter overlapping portion 130 in order to reduce the reflectance of the external light incident from the outside of the first substrate 110. Include.

The color filter overlapping portion 130 may be formed in the process of forming the color filter layer 120, which will be described in detail later.

Light incident from the outside of the first substrate 110 passes through the color filter layer 120 and is reflected by an element formed on the second substrate 160 and exits the outside of the first substrate 110.

In particular, the black matrix region 151 has a higher reflectance of the light incident from the outside of the first substrate 110 than other regions, and thus the black matrix region 151 has a higher reflectance of the external light. ) To form a color filter overlapping portion 130.

The external light incident from the outside passes through the first substrate 110 and passes through the color filter overlapping part 130, reducing the amount of light, and the light reflected by the black matrix 150 passes through the color filter overlapping part 130 again. While being reduced.

The color filter overlapping portion 130 is stacked from the first substrate 110 in an order of lower reflectance to reduce reflectance of external light.

Meanwhile, the light emitted from the organic emission layer 200 of the second substrate 160 passes through the color filter layer 120 and is emitted to the outside, and the color filter overlapping unit 130 reduces interference between neighboring sub-pixels, thereby reducing the display device. The color mixture of (100) can be reduced.

2 is a schematic cross-sectional view of a display device having an RGB structure including a color filter overlapping portion according to another embodiment of the present invention.

Referring to FIG. 2, a color filter layer 120 including R, G, and B regions and a color filter overlapping portion 151 is formed on a first substrate 110.

An overcoat layer 140 and a black matrix 150 are formed on the color filter layer 120, and a color filter overlapping portion () on the color filter layer 120 corresponding to the black matrix region 151 defined by the black matrix 150 130) is formed.

Referring to FIG. 2, the display device 100 is a display device having an RGB 3 sub-pixel structure, and a TFT 170, a pixel electrode 190, an organic emission layer 200, a bank 220 and a common display device are provided on the second substrate 160. It includes an electrode 210.

3A to 3F are schematic cross-sectional views of a manufacturing method according to an embodiment of the present invention.

The process of forming each of the components shown in FIG. 3A is omitted, but referring to FIG. 3A, the TFT 170, the insulating layer 180, the pixel electrode 190, and the bank are on the second substrate 160. 220, the organic emission layer 200 and the common electrode 210 are formed in stages.

3B, C, and D, a blue color filter 121, a red color filter 122, and a green color filter 123 are sequentially formed on the first substrate 110 facing the second substrate 160. The color filter layer 120 may be formed by forming the color filter layer 120, and the color filter overlapping portion 130 may be formed in each step of forming the color filter layer 120 without a separate process.

As a method of forming the color filter layer 120, after applying the blue color filter 121, the red color filter 121 or the green color filter 123 on the first substrate, dry etching using a mask (not shown). It can be formed at a location designated by the designer by etching methods such as (Dry etching).

Specifically, the blue color filter 121 is formed by applying the blue color filter 121 on the first substrate 110 and then removing unnecessary portions through a dry etching process using marks.

When forming the blue color filter 121, the blue color filter 121 is formed by including the color filter overlapping portion 130.

Subsequently, the red color filter 122 is formed by the same method, and the red color filter 122 is formed by overlapping the blue color filter 121 formed on the color filter overlapping portion 130.

Then, the green color filter 123 is formed in the same manner.

When the green color filter 123 is formed, the green color filter 123 is formed by overlapping on the blue color filter 121 and the red color filter 122 formed by overlapping the color filter overlapping portion 130.

Referring to FIG. 3E, an overcoat layer 140 is formed on the color filter layer 120 and a black matrix 150 is formed. In this case, the black matrix 150 is formed to coincide with the color filter overlapping portion 130.

The overcoat layer 140 may be formed by a method such as spin coating to form a flat surface, and may be omitted.

Referring to FIG. 3F, details of the bonding process and the like are omitted, but the first substrate 110 and the second substrate 160 are bonded to each other to complete the display device 100.

Although the 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 can be made without departing from the 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 to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects. The scope of protection of the present invention should be interpreted by the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100 display device 110 first substrate
120 color filter layer 121 blue color filter
122 Red Color Filter 123 Green Color Filter
130 Color filter overlapping part 140 Overcoat layer
150 Black Matrix 151 Black Matrix Area
160 second substrate 170 TFT
180 insulating layer 190 pixel electrode
200 Organic light emitting layer 210 Common electrode
220 banks

Claims (13)

A color filter layer formed on the first substrate and including at least a red color filter, a green color filter, and a blue color filter;
A black matrix formed on the color filter layer;
The black matrix area corresponding to the black matrix includes a color filter overlapping portion in which the red color filter, the green color filter, and the blue color filter are stacked in a vertical direction,
The reflectance of the color filter overlapping portion for external light is lower than that of other color filters,
And the color filter overlapping portion is disposed between the first substrate and the black matrix. The method of claim 1,
And the color filter overlapping portion overlapping the blue color filter, the red color filter, and the green color filter in order of increasing reflectivity from the first substrate. The method of claim 1,
And the color filter overlapping portion overlapping the first substrate in the order of the blue color filter, the red color filter, and the green color filter. The method of claim 1,
The display device, characterized in that the thickness of the color filter overlapping portion is 4 ~ 6 ㎛. The method of claim 1,
The display device further comprising an overcoat layer filling between the color filter layer and the black matrix. The method of claim 1,
And a second substrate including a plurality of light emitting elements facing the first substrate. The method of claim 6,
The display device, wherein the light emitting device is a white light emitting device. The method of claim 6,
And a plurality of subpixels defined by the black matrix and the light emitting device. The method of claim 8,
The display device, wherein the plurality of subpixels includes white subpixels. Forming a blue color filter including a black matrix area on the first substrate;
Forming a red color filter including a black matrix area on the first substrate;
Forming a green color filter including a black matrix area on the first substrate;
Forming an overcoat layer on the first substrate;
Forming a black matrix on the overcoat layer;
Forming a transistor and an organic light-emitting device on a second substrate; And
Including the step of bonding the first substrate and the second substrate,
A method of manufacturing a display device, wherein a part of the blue color filter, a part of the red color filter, and a part of the green color filter are formed to be stacked in a vertical direction between the first substrate and the black matrix. The method of claim 10,
The forming of the blue color filter, red color filter, and green color filter includes an etching process using a mask. The method of claim 11,
The method of manufacturing a display device, wherein the etching process includes a dry etching process. The method of claim 10,
The forming of the overcoat layer includes forming the overcoat layer flat by a spin coding process.

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