KR20160046604A - Display panel and method for manufacturing the same - Google Patents

Abstract

One embodiment of the present invention provides a substrate having a plurality of color sub-pixel regions and a white sub-pixel region constituting one unit pixel. The color sub-pixel region includes a plurality of color sub-pixels, and the white sub-pixel region includes a white sub-pixel. The color sub-pixel region includes a plurality of color filter layers with the different colors, so color is displayed by the color sub-pixels. The white sub-pixel provided in the white sub-pixel includes a reflection reduction layer using a color filter selected from the color filter layers to reduce reflectivity of external light, and makes the thickness of the reflection reduction layer thinner than the thickness of the color filter layer in order to prevent an influence upon white expression of the white sub-pixel. In addition, the reflection reduction layer includes a white balance layer to optimize a wavelength of the light emitted from the white sub-pixel with white wavelength. The light emitted from the white sub-pixel region, which includes the reflection reduction layer and the white balance layer, is capable of reducing the reflectivity with respect to the external light while maintaining white color.

Description

DISPLAY PANEL AND METHOD FOR MANUFACTURING THE SAME [0002]

The present invention relates to a display panel and a method of manufacturing the same, and more particularly, to a display panel which can reduce slimness and reflectance of external light to improve visibility, and a method of manufacturing the same.

Recently, display panels such as LCD (Liquid Crystal Display) and OLED (Organic Light Emitting Diode Display) have attracted attention as flat panel display panels.

In particular, display panels using organic light emitting diodes are advantageous in that they have excellent power consumption and a clearer image quality because no separate light source is required.

A display panel using an organic light emitting diode is realized by forming a thin film transistor (TFT) and an organic light emitting layer on a substrate. When a white organic light emitting device is used as an organic light emitting device, .

The display panel using the color filter and the white organic light emitting device may have a structure of three sub pixels of red, green and blue or white sub pixels pixels may be added to form a four-pixel structure.

The structure of the four subpixels to which the white subpixel is added is that the white color can be expressed by driving only the driving of the white subpixel without driving all of the red, green, and blue pixels to represent white in the display panel, It is advantageous to reduce power consumption.

However, in the case of a white subpixel, since a separate color filter layer is not disposed, reflection of external light by internal electrodes or the like of a pixel may occur, and a visibility problem may occur to a user using the display panel due to an increase of reflectance of external light.

In order to solve the visibility problem due to the reflectance of external light, a polarizer (pol) is used for a display panel.

However, since the thickness of the polarizing plate is thick, the thickness of the display panel is increased and the manufacturing cost is increased. Since the polarizing plate has a property of not being bent, it is possible to implement 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 panel including white subpixels, since an organic light emitting device is not used, a color filter layer is not present, so that the internal reflectance for external light is higher than that of neighboring subpixels.

The external light incident from outside is incident on the organic light emitting device through the substrate, and the incident external light is reflected by the common electrode or the like constituting the organic light emitting device It goes out again.

In order to reduce the visibility due to external light, a polarizing plate or the like may be separately provided on the outside of the substrate to reduce the reflectance. However, since the polarizing plate has a high manufacturing cost and does not bend well in the case of a polarizing plate, And there is a problem in implementing a thin display panel.

Accordingly, it is an object of the present invention to provide a display panel having improved visibility by reducing the reflectance of external light in a white sub-pixel of a display panel using an organic light emitting device.

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 substrate in which a plurality of unit pixels constituting one unit pixel are defined by a plurality of color subpixel regions and white subpixel regions according to an embodiment of the present invention.

A plurality of color subpixel regions constituting one unit pixel are formed in each color subpixel region and a white subpixel is formed in the white subpixel region.

The plurality of color sub-pixel regions include color filter layers formed to have different colors, and various colors can be represented by different single colors or combinations of plural colors of the plurality of color filter layers.

The white subpixel in the white subpixel region including the white subpixel can adjust the brightness of the color realized by the plurality of color filter layers in the color subpixel region and can drive only the white subpixel to represent white in the unit pixel have.

The white subpixel region including the white subpixel may form a reflection reducing layer with respect to external light to lower the reflection to the external light to improve the visibility of the user.

At least one color filter layer among the color filter layers formed in the color subpixel region is formed in the white subpixel region so as to be thinner than the thickness formed in the color subpixel region as the reflection reducing layer.

According to the embodiment of the present invention, the reflection reduction layer is provided in the white subpixel region of the display panel, thereby reducing the reflectance of the external light while maintaining the color of the white subpixel, thereby improving the visibility of the user.

There is an effect that the white color can be maintained with respect to the change of the color of the white subpixel due to the reflection reducing layer.

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.

FIG. 1 is a schematic cross-sectional view of a display panel including a reflection reducing layer for lowering external light reflection in a white sub-pixel region and a white balance layer for maintaining white color balance of white sub-pixels according to an embodiment of the present invention.
2 is a schematic cross-sectional view of a display panel including a reflection reducing layer and a white balance layer according to another embodiment of the present invention.
3A to 3C are schematic cross-sectional views for explaining white balance of a white subpixel to which a reflection reducing layer and a white balance layer are applied according to an embodiment 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.

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, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, various configurations of the display panel including the reflection reducing layer capable of reducing the external light reflectance of the white subpixel according to the embodiment of the present invention and the white balance layer capable of maintaining the white color balance of the white subpixel Will be described.

In the case of the white subpixel of the display panel including the organic light emitting element or the subpixel not having the color filter layer, the external light reflectance by the electrode of the organic light emitting element is high.

In the case of the subpixel including the color filter layer, the external light reflectance by the electrode of the organic light emitting element is low due to the color filter layer.

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 panel including a reflection reducing layer for lowering external light reflection in a white subpixel region and a white balance layer for maintaining a white color life balance of white subpixels according to an embodiment of the present invention.

Referring to FIG. 1, a display panel 100 includes a unit pixel 120 defined by a white subpixel region 130 and a color subpixel region 140.

The white subpixel region 130 includes white subpixels 131 and the color subpixel region 140 includes at least one color subpixel 141.

The white subpixel 131 and the color subpixel 141 include at least one driving element 181 on the lower substrate 111 so that the subpixel is controlled by the driving element 181. The driving element 181 is connected to the organic light emitting element and specifically to the pixel electrode 183 formed on the insulating layer 182.

The organic light emitting layer 184 and the common electrode 185 are formed on the pixel electrode 183 and the pixel electrode 183 is separated into the bank layer 186. [

The pixel electrode 183 may be made of a different material depending on the light emitting mode of the display panel 100.

For example, in the case of the top emission type, the pixel electrode 183 may include a metal-based material that reflects light to reflect the light of the organic light emitting layer 184 upward.

On the other hand, a substrate 110 opposed to the lower substrate 111 is provided. The substrate 110 includes a black matrix 154 and a color filter layer 150 opposite the color sub-pixel region 140.

The color filter layer 150 includes a red color filter 151, a green color filter 152, and a blue color filter 153.

The white subpixel 131 includes a reflection reducing layer 170 and a white balance layer 160 on a substrate 110.

The reflection reducing layer 170 is formed of the same material as the color filter layer selected from the red color filter 151, the green color filter 152 and the blue color filter 153 included in the color filter layer 150.

However, when the white subpixel 131 transmits light through the reflection reducing layer 170, the reflection reducing layer 170 is formed more visibly than the color filter layer 150 to reduce the reflection of external light, Minimize the change.

The white balance layer 160 may be configured with at least one segment, considering the color of the color filter selected as the reflection reducing layer 170 so that light transmitted through the reflection reducing layer 170 is more perceived as white have.

In addition, the white balance layer 160 can further reduce the reflectance of the white sub-pixel region 130 with respect to external light, thereby further improving the visibility.

The thickness of the white balance layer 160 is substantially equal to the thickness of the reflection reducing layer 170 or more than that of the color filter layer 150.

The area of the white balance layer 160 corresponds to 30% to 70% of the white subpixel 130 area. In addition, the area of the reflection reducing layer 170 corresponds to the area of the white sub-pixel region 130.

The color filter selected as the reflection reducing layer 170 and the color filter selected as the white balance layer 160 may be different colors.

The white balance layer 160 prevents the white subpixel 131 from being biased to a specific color due to the reflection reducing layer 170 when the display panel 100 displays white color and black color, White and black color expressions can be further enhanced.

The white balance layer 160 may control the white balance of the white light of the white sub-pixel region 230 by adjusting the width of the white balance layer 160 according to the color of the color filter employed in the reflection reducing layer 170.

A detailed description thereof will be described later.

2 is a schematic cross-sectional view of a display panel including a reflection reducing layer and a white balance layer according to another embodiment of the present invention.

Referring to FIG. 2, the display panel 200 includes a unit pixel 220 defined by a white subpixel region 230 and a color subpixel region 240.

The white subpixel region 230 includes a white subpixel 231 and the color subpixel region 240 includes at least one color subpixel 241.

The white subpixel 231 and the color subpixel 241 include the driving element 281 on the lower substrate 211 and the driving element 281 includes the white subpixel 231 and the color subpixel 241 And controls the light emission.

An insulating layer 282 is formed on the driving element 281 and a pixel electrode 283 is formed on the insulating layer 282. The driving element 281 and the pixel electrode 283 are connected to each other, .

The pixel electrode 283 is formed separately from the subpixels by the bank layer 286. [

An organic light emitting layer 284 and a common electrode 285 are formed on the pixel electrode 283 to constitute an organic light emitting device.

The pixel electrode 283 and the common electrode 285 inject electrons and holes into the organic light emitting layer 284 to emit light in the organic light emitting layer 284 and form a hole injecting layer, A transport layer, and an electron injection layer.

The substrate 210 facing the lower substrate 211 includes a black matrix 254 and a color filter layer 250 and includes a reflective lower layer 270 and a white balance layer 260 ).

The color filter layer 250 facing the color subpixel region 240 may include a red color filter 251, a green color filter 252 and a blue color filter 253, The black matrix 254 may be included at the boundary to prevent color mixing between sub-pixels.

The reflective sublayer 270 corresponding to the white subpixel region 230 is formed by a color filter selected from a red color filter 251, a green color filter 252 and a blue color filter 253 constituting the color filter layer 250 But may be formed to be thinner than the color filter layer 250 so that the wavelength of the light emitted from the organic light emitting layer 284 does not have a wavelength of red, green or blue.

The pixel electrode 283 of the organic light emitting element constituting the white subpixel 231 may be formed of a metallic material reflecting light emitted from the organic light emitting layer 284, A decrease in visibility may occur.

Therefore, the reflection reducing layer 270 has an effect of suppressing external light reflection by the pixel electrode 283 and the like.

The white balance layer 260 may employ a color filter used in the color filter layer 250 or a color filter that is a mixture of two colors.

For example, the white balance layer 260 may be a color filter in which the colors of red and green are mixed.

The white balance layer 260 may adjust the width or thickness of the white subpixel region 230 in order to adjust the white color of the white subpixel region 230. The white balance layer 260 may change the width and thickness according to the color of the color filter employed in the reflection reducing layer 270 Can be designed.

3A to 3C are schematic cross-sectional views for explaining white balance of a white subpixel to which a reflection reducing layer and a white balance layer are applied according to an embodiment of the present invention.

Referring to FIG. 3A, when a blue color filter is used as the reflection reducing layer 370, a white organic light emission as a light source is taken as an example. A light source having a wavelength of red (R), green (G) A case where light is transmitted through the reflection reducing layer 370 and the white balance layer 360 will be described as an example.

Since the blue light is applied to the reflection reducing layer 370, the green light and the red light are reduced in the first pass through the blue light.

The white balance layer 360 is divided into a red color filter and a green color filter.

Light passing through the white balance layer 360 transmits red light and green light.

As a result, the light transmitted through the reflection reducing layer 370 and the light transmitted through the reflection reducing layer 370 and the white balance layer 360 maintain the intensity of the red, green, and blue wavelengths constantly, do.

The white balance layer 360 may be formed of a plurality of color filters depending on the thickness of the reflection reducing layer 370. When the white balance layer 360 is formed by adjusting the thickness and width of the white balance layer 360, The ratio of the red, green, and blue wavelengths of the light transmitted through the white balance layer 360 can be adjusted to maintain the white balance.

3B and 3C, the white balance layer 360 may be a mixed color filter of red and green or a color filter of a single color.

3B shows an example using a mixed color filter of red and green as the white balance layer 360. The light transmitted through the reflection reducing layer 370 and the white balance layer 360 is a light having a wavelength of green and red, And maintains the white color balance with the wavelength of light not transmitted through the layer 360.

FIG. 3C shows an example using a red color filter as a single color filter as the white balance layer 360. The red color filter is composed of the light transmitted through the reflection reducing layer 370 and the light transmitted through the reflection reducing layer 370 and the white balance layer 360 The wavelength of the white color balance is maintained together.

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, 200: display panel
110, 210 and 310:
111 and 211:
120, 220: unit pixel
130, 230: White sub-pixel area
131, 231: white subpixel
140: Color sub-pixel area
141: Color sub-pixel
150, 250: Color filter layer
160, 260, 360: white balance layer
170, 270, 370: reflection reducing layer

Claims (12)

A substrate on which a color subpixel region and a white subpixel region constituting one unit pixel are defined;
At least one color subpixel included in the color subpixel region;
A white subpixel included in the white subpixel region;
A plurality of color filter layers having different colors in the color subpixel regions;
A white balance layer included in the white subpixel region; And
And a reflection reduction layer included in the white subpixel region,
Wherein the reflection reducing layer includes at least one color filter layer selected from a plurality of the color filter layers,
Wherein the white balance layer is at least one color filter selected from the reflection / reflection reduction layer. The method according to claim 1,
Wherein the plurality of color subpixels comprise red subpixels, green subpixels, and blue subpixels. 3. The method of claim 2,
Wherein the color filter layer is a color filter selected from a red color filter, a green color filter and a blue color filter. The method according to claim 1,
And an area of the white balance layer corresponds to an area of 30% to 70% of the white sub pixel area. The method according to claim 1,
And the area of the reflection reducing layer corresponds to the area of the white sub-pixel area. The method according to claim 1,
Wherein the reflection reducing layer is a blue color filter. The method according to claim 6,
Wherein the white balance layer comprises at least one color filter segment,
Wherein the color filter segment comprises a color filter segment selected from a red color filter and a green color filter. The method according to claim 6,
Wherein the white balance layer is a mixture of a red color filter and a green color filter. The method according to claim 1,
And a lower substrate corresponding to the substrate and including an organic light emitting element. 10. The method of claim 9,
And the organic light emitting element corresponding to the white subpixel region is a white light emitting element. 10. The method of claim 9,
And the organic light emitting element corresponding to the color subpixel region is an organic light emitting element of the same color as the color filter layer corresponding to the color subpixel region. The method according to claim 1,
Wherein the color filter selected as the reflection reducing layer and the color filter selected as the white balance layer are different colors.

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