KR20150125202A - Display apparatus and manufacturing method of the same - Google Patents

Abstract

According to an embodiment of the present invention, provided is a display device with decreased reflectivity of external light. A white sub-pixel has a color filter segment layer formed thereon, and the color filter segment layer has a red segment, a blue segment, and a green segment formed thereon, thereby decreasing reflection of external light while maintaining a white color of the white sub-pixel.

Description

DISPLAY APPARATUS AND MANUFACTURING METHOD OF THE SAME [0002]

The present invention relates to a display device and a method of manufacturing the same, and more particularly, to a display device capable of increasing the visibility by reducing the reflectance to external light while slim, and a method of manufacturing the same.

Recently, display devices such as a liquid crystal display (LCD) and an organic light-emitting diode display (OLED) are attracting attention as flat panel display devices. Particularly, display devices using organic light emitting diodes are advantageous in that they do not require a separate light source, and thus can realize excellent image quality with higher power consumption.

A display device using an organic light emitting diode is realized 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 the top panel to express color.

The display device using the white organic light emitting device may be formed with three subpixels of red, green, and blue using a color filter to express color, A four sub-pixel structure can also be formed by adding a white sub pixel.

In particular, when white subpixels are added to three subpixels of red, green, and blue, it is advantageous to reduce the power consumption of the display device because all the subpixels need not be driven in order to achieve white color.

However, in the case of the white subpixel, since the color filter layer is not used, the external light is reflected on the white subpixel electrodes constituting the white subpixel, which may cause a visibility problem to the user using the display device.

Therefore, in order to reduce the reflectance of external light in a display device using a white organic light emitting device, a polarizer is attached to the outside of the display device.

However, since the polarizer is thick and does not bend well, there is a problem of increasing the thickness and manufacturing cost of a display device, and at the same time, there are various problems in implementing a flexible display.

[Related Technical Literature]

[Patent Literature]

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

In the case of a white subpixel in a display device using a white organic light emitting element, since the same layer as a color filter layer is not present in comparison with a surrounding colored subpixel, the internal reflectance for external light is different from that of surrounding colored subpixels Respectively.

The external light incident from the outside is incident on the organic light emitting element layer through the substrate and reflected by the common electrode constituting the organic light emitting element, The path is not reduced as it is but goes out.

In order to suppress this, a polarizing plate or the like may be separately provided outside the substrate so as to suppress the reflectance. However, since the polarizing plate has a high manufacturing cost and is not bend well, the display device is flexible and thin due to the thickness of the polarizing plate there is a problem.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a display device and a method of manufacturing a display device using the organic light emitting device, in which the reflectance of external light is reduced with respect to the white subpixel of the display device to improve the visibility.

The solutions according to one embodiment of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

There is provided a display device having white subpixels and colored subpixel portions according to an embodiment of the present invention.

A color filter layer is formed on a first substrate and a white substrate on which a white subpixel and a colored subpixel are formed and a second substrate facing the first substrate. The color filter layer of the second substrate facing the white subpixel of the first substrate includes a color filter segment portion.

According to another aspect of the present invention, the color filter segment portion includes at least one of a red segment, a green segment, and a blue segment.

According to another aspect of the present invention, the blue segment corresponds to a size of 10 to 50% of the area of the white subpixel.

According to another aspect of the present invention, the green segment corresponds to a size of 10 to 50% of the area of the white subpixel.

According to still another aspect of the present invention, there is provided a liquid crystal display device including a black matrix formed on a color filter segment.

According to still another aspect of the present invention, there is provided an image processing apparatus including a color filter segment.

According to another aspect of the present invention, the auxiliary color segment is characterized in that a part of the color filter segment is formed by being extended.

According to another aspect of the present invention, the auxiliary color segment is characterized by being within 30% of the area of the color filter segment.

According to another aspect of the present invention, the auxiliary color segment is formed to have a width of 1 to 2 占 퐉.

According to another aspect of the present invention, there is further provided a display device including a black matrix formed on an auxiliary color segment.

According to another aspect of the present invention, the thickness of the color filter layer is 1.5 to 2.5 占 퐉.

According to another aspect of the present invention, the colored subpixel portion includes a red subpixel, a green subpixel, and a blue subpixel.

A method of manufacturing a display device having white subpixels and colored subpixel portions according to an embodiment of the present invention is provided. Forming a color filter layer on the second substrate, forming an overcoat layer on the second substrate, forming a black matrix on the overcoat layer, forming a black matrix on the overcoat layer, , And joining the first substrate and the second substrate.

According to another aspect of the present invention, forming the transistor, the white subpixel, and the colored subpixel portion on the first substrate includes forming the white organic light emitting element in the white subpixel portion and the colored subpixel portion .

According to still another aspect of the present invention, the step of forming the color filter layer on the second substrate includes a step of sequentially forming a red color filter, a green color filter, and a blue color filter.

According to still another aspect of the present invention, the step of forming the color filter layer on the second substrate includes forming the color filter segment opposed to the white subpixel simultaneously with the color filter layer.

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

According to the embodiment of the present invention, the white subpixel is provided with a color filter layer, thereby maintaining the white color of the white subpixel while lowering the reflectance of the external light.

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

The scope of the claims is not limited by the matters described in the contents of the invention, as the contents of the invention described in the problems, the solutions to the problems and the effects to be solved do not specify essential features of the claims.

1 is a schematic cross-sectional view of a display device in which reflectance of external light of a white subpixel portion according to an exemplary embodiment of the present invention is reduced.
2 is a schematic cross-sectional view of a display device according to another embodiment of the present invention.
3 is a schematic cross-sectional view of a display device according to another embodiment of the present invention.
4 is a schematic cross-sectional view of a display device according to another embodiment of the present invention.
5A-5E are schematic process cross-sectional views illustrating a method of manufacturing according to various embodiments of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Where the terms "comprises", "having", "done", and the like are used in this specification, other portions may be added unless "only" is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if a temporal posterior relationship is described by 'after', 'after', 'after', 'before', etc., 'May not be contiguous unless it is used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, and technically various interlocking and driving are possible, and that the embodiments may be practiced independently of each other, It is possible.

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

Various embodiments of the present invention will now 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 of a white subpixel portion according to an exemplary embodiment of the present invention is reduced.

Referring to FIG. 1, a display device 100 including a white subpixel 110 and a colored subpixel portion 120 is provided.

A transistor 131 is formed on the first substrate 130 and an insulating layer 132, a bank 136 and a pixel electrode 133 are formed on the transistor 131.

The first substrate 130 may be formed of any one of glass, plastic, and metal. And a protective layer for preventing penetration of oxygen and moisture.

An organic light emitting layer 134 is formed on the pixel electrode 133 and a common electrode 135 is formed on the organic light emitting layer 134.

When the display device is a top emission type, the organic light emitting layer 134 may reflect light generated from the organic light emitting layer 134 to an upper portion of the display device.

The organic light emitting layer 134 emits light by holes and electrons injected through the pixel electrode 133 and the common electrode 135, respectively.

Although the organic light emitting layer 134 is schematically illustrated as a single layer in FIG. 1, the organic light emitting layer 134 may have a multi-layer structure composed of different materials in order to enhance the light emitting efficiency and stability of the organic light emitting layer 134. For example, , A light emitting layer, an electron transporting layer, an electron injecting layer, or the like.

Meanwhile, a second substrate 140 facing the first substrate 130 is provided.

The color filter layer 150 is formed on the second substrate 140 and the colors of red, green, and blue are expressed by the color filter layer 150 in the colored sub pixel unit 120.

In detail, the color filter layer 150 opposed to the colored subpixel portion 120 may be composed of a combination of the red color filter 151, the green color filter 152, and the blue color filter 153, The light emitted from the organic light emitting layer 134 of the organic light emitting layer 130 is transmitted through the color filter layer 150 to express a hue.

The color filter layer 150 facing the white subpixel portion 110 includes the color filter segment portion 154 to reduce the reflectance of the white subpixel portion 110 with respect to external light.

The amount of light transmitted by the color filter segment portion 154 is reduced when external light is incident on the white subpixel 110 and reflected by the internal metal electrode of the first substrate 130 The amount of light is reduced, and as a result, the reflectance of the white subpixel 110 with respect to external light is reduced.

The color filter segment 154 may be configured with a red segment 154R, a green segment 154G, a blue segment 154B, etc. to maintain the color of the white light emitted from the white subpixel 110, The blue segment 154B having the smallest light reflectance with respect to the color filter segment portion 154 can be formed with an area of 10% to 50% of the color filter segment portion 154. [

Alternatively, in consideration of the light efficiency of the white subpixel 110, the green segment 154G may be formed in an area of 10% to 50% of the color filter segment 154. [

2 is a schematic cross-sectional view of a display device according to another embodiment of the present invention.

Referring to FIG. 2, a black matrix 242 is formed on the color filter segment portion 154 opposite to the white subpixel 110 of the second substrate.

The black matrix 242 on the color filter segment portion 154 is formed at the boundary position of the red segment 154R, the green segment 154G and the blue segment 154B constituting the color filter segment portion 154, Thereby preventing color mixture and moire phenomenon between the segments constituting the light emitting section 154. Accordingly, while maintaining the white light of the white subpixel 110, the black matrix 142 may additionally be used to further reduce the reflectance of the white subpixel 110 to external light.

3 is a schematic cross-sectional view of a display device according to another embodiment of the present invention.

The color filter segment 354 can combine white light with a combination of a red segment 354R, a green segment 354G, and a blue segment 354B, and can also combine white light with other combinations of complementary colors Configuration is possible.

For example, a combination of red, blue, and green is a combination of white light, while a combination of yellow and green can be combined to produce a white light.

When a plurality of segments of color are formed so as to overlap each other in the order of forming each segment, an effect of reducing the cell gap due to process variations can be expected. In addition, The reflectance due to light can be further lowered.

Referring to FIG. 3, auxiliary color segments 355 are formed on adjacent boundaries of red segment 354R, green segment 354G, and blue segment 354B.

The auxiliary color segment 355 may be formed by extending the red segment 354R, the green segment 354G and the blue segment 354B constituting the color filter segment portion 354 and the color filter segment portion 354 Or may be formed through a separate process.

It is preferable that the auxiliary color segment 355 is formed to have a thickness of 1 to 2.5 탆 and is formed to have an area of 30% or less of the color filter segment portion 354 in consideration of the efficiency of the white subpixel 110.

4 is a schematic cross-sectional view of a display device according to another embodiment of the present invention.

4, a color filter segment portion 354 is formed on a second substrate 140 facing the white subpixel 110 and an auxiliary color segment 355 is formed on the color filter segment portion 354 .

A black matrix 442 is further formed on the auxiliary color segment 355 to prevent color mixing and moire phenomenon for the color filter segment portion 354 and to prevent the color filter segment portion 354 and the auxiliary color segment The reflectance of the white subpixel 110 to the external light is lowered by the black matrix 355 and the black matrix 442.

5A-5E are schematic process cross-sectional views illustrating a method of manufacturing according to various embodiments of the present invention.

5A, a transistor 131, an insulating layer 132, a pixel electrode 133, a bank 136, an organic light emitting layer 134, and a common electrode 135 are formed stepwise on a first substrate 130 . The drawings for specific processes for forming each constitution are omitted.

Referring to FIGS. 5B, 5C, and 5D, a red color filter 151, a green color filter 152, and a blue color filter 153 are sequentially formed on a second substrate 140 facing the first substrate 130 To form the color filter layer 150, the color filter segment 154 may be formed at a position corresponding to the white subpixel 110 without any additional process.

Referring to FIGS. 5c and 5d, the auxiliary color segments 355 may be formed at the same time when forming the color filter segment portions 354 to simultaneously form the auxiliary color segment portions 355 without additional processing.

In detail, the auxiliary color segment 355 overlaps the formation positions of the red segment 354R, the green segment 354G and the blue segment 354B to form a red segment 354R, a green segment 354G, (354B) may extend and overlap each other.

Then, an overcoat layer 141 is formed and a black matrix 142 is formed as shown in FIG. 5E. At this time, as shown in FIG. 5 (e), the black matrix 142 is also formed on the color filter segment portion 154 opposed to the white subpixel 110 as the red segment 154R, the green segment 154G, Can be formed at the boundary position of the color filter 154B or on the auxiliary color segment.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

100 display device 110 white subpixel
120 colored subpixel unit 130 a first substrate
131 transistor 132 insulating layer
133 pixel electrode 134 OLED
135 common electrode 136 bank
140 second substrate 141, 341 overcoat layer
142, 242, 442 black matrix 150, 350 color filter layer
151 Red Color Filter 152 Green Color Filter
153 Blue Color Filter 154 Color Filter Segment
154R, 354R Red segment 154B, 354B Blue segment
154G, 354G Green segment 355 Auxiliary color segment

Claims (16)

A white subpixel and a colored subpixel formed on the first substrate; And
And a color filter layer formed on a second substrate facing the first substrate,
And the color filter layer facing the white subpixel includes a color filter segment portion. The method according to claim 1,
Wherein the color filter segment portion comprises at least one of a red segment, a blue segment, and a green segment. 3. The method of claim 2,
Wherein the blue segment corresponds to a size of 10 to 50% of an area of the white subpixel. 3. The method of claim 2,
Wherein the green segment corresponds to a size of 10 to 50% of the white subpixel area. 3. The method of claim 2,
And a black matrix formed on the color filter segments. The method according to claim 1,
And further comprising an auxiliary color segment on the color filter segment. The method according to claim 6,
Wherein the auxiliary color segment is formed by extending a portion of the color filter segment. The method according to claim 6,
Wherein the auxiliary color segment is within 30% of the area of the color filter segment. The method according to claim 6,
Wherein the auxiliary color segment is formed with a width of 1 to 2 占 퐉. The method according to claim 6,
And a black matrix formed on the auxiliary color segment. The method according to claim 1,
And the thickness of the color filter layer is 1.5 to 2.5 占 퐉. The method according to claim 1,
Wherein the colored subpixel portion comprises a red subpixel, a green subpixel, and a blue subpixel. Forming a transistor, a white subpixel, and a colored subpixel portion on a first substrate;
Forming a color filter layer on the second substrate;
Forming an overcoat layer on the second substrate;
Forming a black matrix on the overcoat layer;
And bonding the first substrate and the second substrate to each other. 14. The method of claim 13,
The step of forming transistors, white subpixels and colored subpixel portions on the first substrate
Forming a white organic light emitting element in the white subpixel portion and the colored subpixel portion. 14. The method of claim 13,
Wherein forming the color filter layer on the second substrate comprises:
A red color filter, a green color filter, and a blue color filter in this order. The method of claim 13, wherein
Wherein forming the color filter layer on the second substrate comprises:
And forming a color filter segment opposite to the white subpixel at the same time as the color filter layer.

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