WO2013159527A1

WO2013159527A1 - Display device, color filter and manufacturing method thereof

Info

Publication number: WO2013159527A1
Application number: PCT/CN2012/085781
Authority: WO
Inventors: 刘宸; 陆金波; 舒适; 田肖雄; 王雪岚
Original assignee: 京东方科技集团股份有限公司
Priority date: 2012-04-27
Filing date: 2012-12-04
Publication date: 2013-10-31
Also published as: CN103376592A

Abstract

A display device, a color filter (300) and a manufacturing method thereof. The color filter (300) comprises a substrate (1), black matrices (2) disposed on the substrate (1), and color pixel regions arranged between the black matrices (2). The color pixel regions comprise a plurality of sub-pixel regions. Each sub-pixel region comprises at least two kinds of color pixel units and a mixed color pixel unit. The display device, the color filter (300) and the manufacturing method thereof enable the production efficiency to be improved, the production cost to be reduced highly, the four-color image display to be better realized, the brightness and the color of pictures to be improved and enriched, the display quality of images to be effectively improved, and the experience feeling of users to be enhanced.

Description

Display device, color filter and manufacturing method thereof

Embodiments of the present invention relate to a display device, a color filter, and a method of fabricating the same. Background technique

In recent years, liquid crystal display technology has been continuously developed and improved. TFT-LCD (Thin Film Transistor-Liquid Crystal Display) is an important position in the display field with its advantages of good image quality, low energy consumption and environmental protection. At present, the TFT-LCD is mainly formed by an array substrate and a color filter pair box, and the cavity behind the box is filled with liquid crystal. The existing color filter is based on a color filter of three primary colors of red, green and blue. The liquid crystal panel controls the arrangement state of the liquid crystal molecules by changing the voltage of the driving IC, and forms a liquid crystal switch to select whether to allow the light of the backlight to penetrate. The three primary colors are blended to form different colors, so that the liquid crystal display presents a bright and vivid picture.

As shown in FIG. 1 , it is a schematic diagram of a conventional color filter structure, which comprises a glass substrate Γ, a black matrix 2 ′ disposed on the glass substrate 用于 for shielding, a color pixel layer, a protective layer 6 ′ and a transparent conductive layer 7 . . The color pixel layer includes a red (R) pixel layer 3, a green (G) pixel layer 4, and a blue (Β) pixel layer 5, . The liquid crystal panel uses the pixel layers of the three primary colors and controls the light transmitted through the backlight through the liquid crystal switch to realize the display of the image color. However, the conventional color filter of the three primary color displays has been unable to meet the demand for high brightness and color saturation of the liquid crystal display.

In order to improve the display image quality of liquid crystal displays, color filters based on four-color display have appeared on the market. As shown in FIG. 2, it is a schematic diagram of a color filter structure of a first prior art four-color display, which comprises a glass substrate, a black matrix 2 disposed on a glass substrate for shielding, and a color pixel region. The protective layer 6 is sequentially disposed on the color pixel region, and the transparent conductive layer 7 is included. The color pixel layer region has four pixel regions: a red pixel layer 3, a green pixel layer 4, a blue pixel layer 5', and a yellow (Υ) pixel layer 9'. The added yellow pixel layer 9' implements a four-color display of the color filter to improve the color saturation of the image display.

As shown in FIG. 3, it is a schematic diagram of a color filter structure of a second prior art four-color display, which comprises a glass substrate, a black matrix 2' disposed on the glass substrate, and a color pixel region. The domain further includes a protective layer 6' and a transparent conductive layer 7' which are sequentially located on the color pixel region. The color pixel layer region has four pixel regions: a red pixel layer 3, a green pixel layer 4, a blue pixel layer 5, and a white (W) pixel layer 8. The added white pixel layer 8 realizes four-color display of the color filter to improve the brightness of the image display.

However, the above two kinds of color filters for realizing four-color display need to form four pixel regions separately by using four patterning processes independently. However, using a patterning process every time will seriously increase the production cost of the entire product and make it inefficient. That is to say, the yellow pixel layer or the white pixel layer added in the prior art requires an additional independent patterning process with the conventional color filter having the three primary color display, resulting in low production efficiency and increased production cost. . Summary of the invention

Embodiments of the present invention provide a display device, a color filter, and a method for fabricating the same, which can overcome the complicated and cumbersome process caused by the conventional four-color patterning process for forming a color filter having four color pixel units. Inefficiency, increased production costs and other defects.

An aspect of the invention provides a color filter, comprising: a substrate; a black matrix disposed on the substrate; a color pixel region located between the black matrices, the color pixel region including a plurality of sub-pixel regions Each of the sub-pixel regions includes at least two color pixel units and mixed color pixel units.

For the color filter, for example, the pixel unit of the at least two colors is equal in size and shape identical to the mixed color pixel unit.

For the color filter, for example, the pixel unit of the at least two colors includes a red pixel unit, a green pixel unit, and a blue pixel unit, and the mixed color pixel unit is composed of at least two of red, green, and blue. The sub-pixel unit of color is composed.

For the color filter, for example, the red pixel unit is formed by the same patterning process as the red sub-pixel unit constituting the mixed color pixel unit; and/or the green pixel unit and the mixed color pixel are formed. The green sub-pixel unit in the cell is formed by the same patterning process; and/or, the blue pixel unit is formed by the same patterning process as the blue sub-pixel unit constituting the mixed color pixel unit.

Another aspect of the present invention also provides a display device comprising the above-described color filter.

A still further aspect of the present invention provides a method of fabricating a color filter, including: Step S1, forming a black matrix on the substrate by using a patterning process;

Step S2, forming a color pixel region between the black matrices by using a patterning process, the color pixel region comprising a plurality of sub-pixel regions, each of the sub-pixel regions comprising pixel cells of at least two colors and mixed color pixel cells.

For the method, for example, pixel units of at least two colors are equal in size and shape identical to the mixed color pixel unit.

For the method, for example, the pixel unit of the at least two colors includes a red pixel unit, a green pixel unit, and a blue pixel unit, and the mixed color pixel unit is composed of at least two colors of red, green, and blue. Pixel unit configuration.

For the method, for example, the red pixel unit is formed by the same patterning process as the red sub-pixel unit constituting the mixed color pixel unit; and/or the green pixel unit and the green pixel constituting the mixed color pixel unit The sub-pixel unit is formed by the same patterning process; and/or, the blue pixel unit is formed by the same patterning process as the blue sub-pixel unit constituting the mixed color pixel unit.

The embodiment of the invention provides a display device, a color filter and a manufacturing method thereof, which can improve production efficiency and greatly reduce production cost; meanwhile, the color filter can better realize four-color image display. It greatly enhances and enriches the brightness and color of the picture, effectively improves the display quality of the image and enhances the user's experience. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below. It is obvious that the drawings in the following description relate only to some embodiments of the present invention, and are not intended to limit the present invention. .

1 is a schematic structural view of a conventional color filter;

2 is a schematic structural view of a first prior art color filter;

3 is a schematic structural view of a second prior art color filter;

4 is a schematic structural view of a color filter according to an embodiment of the present invention;

5 is a process flow diagram of a method for fabricating a color filter according to an embodiment of the present invention;

6 is a schematic structural view of a color filter according to Embodiment 2 of the present invention;

Figure 7 is a schematic illustration of a display device in accordance with an embodiment of the present invention. Reference mark:

1. Glass substrate; 2. Black matrix; 3. Red pixel unit; 4. Green pixel unit; 5. Blue pixel unit; 6. Mixed color pixel unit; 7. Protective layer; 8. Transparent conductive layer. detailed description

The technical solutions of the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings of the embodiments of the present invention. It is apparent that the described embodiments are part of the embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present invention without departing from the scope of the invention are within the scope of the invention.

Unless otherwise defined, technical terms or scientific terms used herein shall be of the ordinary meaning understood by those of ordinary skill in the art to which the invention pertains. The words "first", "second" and similar terms used in the specification and claims of the present invention do not denote any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the words "a" or "an" do not denote a quantity limitation, but rather mean that there is at least one. The words "including" or "comprising", etc., are intended to mean that the elements or objects preceding "including" or "comprising" are intended to encompass the elements or Component or object. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationship may also change accordingly.

Example 1

As shown in FIG. 4, an embodiment of the present invention provides a color filter comprising: a glass substrate 1, a black matrix 2, a color pixel region, a protective layer 7, and a transparent conductive layer 8. The black matrix 2 is disposed on the glass substrate 1; the color pixel regions are located between the black matrixes 2, and include a plurality of sub-pixel regions, each of the sub-pixel regions including at least two color pixel units and mixed color pixel units.

In this embodiment, each sub-pixel region includes pixel units of four colors, which are a red (R) pixel unit 3, a green (G) pixel unit 4, a blue (B) pixel unit 5, and a mixed color pixel unit 6, respectively. The mixed color pixel unit 6 is composed of sub-pixel units of two colors of red and green. For example, the red pixel unit 3, the green pixel unit 4, the blue pixel unit 5, and the mixed color pixel sheet The elements 6 are equal in size and have the same shape. The mixed color pixel unit 6 composed of two colors of red and green displays yellow. For example, in order to make the yellow color of the display thereof more in line with the yellow reference color, the regions of the red sub-pixel unit and the green sub-pixel unit in the mixed color pixel unit 6 are set to be equal. The green sub-pixel unit and the green pixel unit 4 in the mixed color pixel unit 6 are formed by the same patterning process, which is made of the same material as the green pixel unit 4. The red sub-pixel unit and the red pixel unit 3 in the mixed color pixel unit 6 are formed by the same patterning process, which is made of the same material as the red pixel unit 3. The protective layer 7 is located on the color pixel area for flattening the color pixel area and the black matrix 2. On the surface of the protective layer 7, there is a transparent conductive layer 8 for forming a pixel electrode. The transparent conductive layer 8 may be made of an ITO material.

The patterning process used in the present invention is a process of exposure, development, etching, and photoresist removal which is conventionally used in the prior art.

The color contained in the pixel unit can be determined according to actual needs. The mixed color pixel unit 6 is not limited to the red and green colors in the embodiment, and the color types included in the mixed color pixel unit can be determined according to actual needs.

In the liquid crystal panel using the above color filter, the red pixel unit 3, the green pixel unit 4, the blue pixel unit 5, and the mixed color pixel unit 6 are respectively controlled by separate driving IC elements. The mixed color pixel region in the mixed color pixel unit 6 is also controlled by a single driving IC element. When the voltage of the mixed color pixel unit 6 is turned on, that is, the mixed color pixel unit 6 is changed by changing the arrangement state of the liquid crystal molecules. When light passes, the red sub-pixel unit and the green sub-pixel unit in the mixed color pixel unit 6 simultaneously transmit light, and yellow light formed by mixing the red sub-pixel unit and the green sub-pixel unit is displayed. When the mixed color pixel unit 6 has no light passing through, the red sub-pixel unit and the green sub-pixel unit in the mixed color pixel unit 6 are both opaque, that is, displayed in a black occlusion state.

Compared with the color filter of the prior art three-color display, the newly added mixed color pixel unit 6 forms a yellow display by mixing the red sub-pixel unit and the green sub-pixel unit, and realizes four-color display of the color filter. , to enhance and enrich the color saturation of the image, to achieve the color filter color requirements, effectively improve the image display quality, enhance the user's experience. At the same time, the color filter with four color pixel units can be produced by using only three patterning processes, which improves the production efficiency and greatly reduces the production cost.

As shown in FIG. 5, an embodiment of the present invention provides a process for fabricating the above color filter structure. Method, the method includes the following steps.

Step S1, forming a black matrix layer having a black matrix pattern by using a patterning process on the substrate.

For example, a photoresist for a black matrix is coated on a glass substrate, and exposed and developed by a patterned mask to obtain a black matrix pattern. The substrate to be used may also be a plastic substrate or the like.

Step S2: forming a color pixel region between the black matrices by using a patterning process, the color pixel region including a plurality of sub-pixel regions, each of the sub-pixel regions including at least two color pixel units and mixed color pixel units.

In this embodiment, each sub-pixel region includes pixel units of four colors, which are a red pixel unit, a green pixel unit, a blue pixel unit, and a mixed color pixel unit, and the mixed color pixel unit is composed of two colors of red and green. Pixel unit configuration. A mixed color pixel unit composed of two colors of red and green displays yellow.

For example, in this embodiment, a red photoresist is coated on the glass substrate of step S1, and a red pixel unit is simultaneously formed on the corresponding position of the substrate by exposure, development, etching, and photoresist removal by patterning the mask. And a red sub-pixel unit in the mixed color pixel unit; repeating the above steps to simultaneously form a green sub-pixel unit in the green pixel unit and the mixed color pixel unit, the green sub-pixel unit being closely attached to the red sub-pixel unit to form a mixed color pixel The unit, the green sub-pixel unit and the red sub-pixel unit are mixed to form a yellow display, and the blue pixel unit is formed by the above process steps.

Alternatively, a protective layer may be applied on the substrate on which step S2 is completed for flattening the color pixel regions and the black matrix. It is also possible to sputter a transparent conductive layer on the protective layer for forming a pixel electrode.

It should be noted that the formation of the red pixel unit, the green pixel unit, and the blue pixel unit in this step does not limit the order. The red pixel unit, the green pixel unit, the blue pixel unit, and the mixed color pixel unit are equal in size and have the same shape.

The red pixel unit, the green pixel unit, the blue pixel unit, and the mixed color pixel unit in the color filter are controlled by separate driving IC elements. The mixed color pixel unit is also controlled by a driving IC element. When the voltage of the mixed color pixel unit is turned on, that is, the mixed color pixel unit has light passing through by changing the arrangement state of the liquid crystal molecules, the mixed color pixel The red sub-pixel unit and the green sub-pixel unit in the cell simultaneously transmit light, and a yellow color formed by mixing the red sub-pixel unit and the green sub-pixel unit is displayed. When the mixed color pixel unit has no light passing through, the red sub-pixel unit and the green sub-pixel unit in the mixed color pixel unit are opaque, that is, displayed as black. Occlusion state. Compared with the existing four-color color filter process, the four-color display of the color filter not only reduces the patterning process, improves the production efficiency, greatly reduces the production cost, and can achieve better results. The purpose of the four-color display is to enhance the color saturation of the color filter and improve the display quality of the image.

Example 2

As shown in FIG. 6, an embodiment of the present invention provides a color filter comprising: a glass substrate 1, a black matrix 2, a color pixel region, a protective layer 7, and a transparent conductive layer 8. The black matrix 2 is disposed on the glass substrate 1; the color pixel regions are located between the black matrixes 2 and include a plurality of sub-pixel regions, each of the sub-pixel regions including at least two color pixel units and mixed color pixel units.

In this embodiment, each sub-pixel region includes pixel units of four colors, which are a red (R) pixel unit 3, a green (G) pixel unit 4, a blue (R) pixel unit 5, and a mixed color pixel unit 6, respectively. The mixed color pixel unit 6 is composed of sub-pixel units of three colors of red, green, and blue. For example, the red pixel unit 3, the green pixel unit 4, the blue pixel unit 5, and the mixed color pixel unit 6 are equal in size and have the same shape. For example, the mixed color pixel unit 6 composed of three colors of red, green, and blue displays white. For example, in order to make the white color of the display more conform to the white reference color, the areas of the red sub-pixel unit, the green sub-pixel unit, and the blue sub-pixel unit in the mixed-color pixel unit 6 are set equal. The red sub-pixel unit and the red pixel unit 3 in the mixed color pixel unit 6 are formed by the same patterning process, which is made of the same material as the red pixel unit 3; the green sub-pixel unit and the green in the mixed color pixel unit 6 The pixel unit 4 is formed by the same patterning process, which is made of the same material as the green pixel unit 4. The blue sub-pixel unit and the blue pixel unit 5 in the mixed color pixel unit 6 are formed by the same patterning process, and are made of the same material as the blue pixel unit 5.

The protective layer 7 is located on the color pixel area for flattening the color pixel area and the black matrix 2. On the surface of the protective layer 7, there is a transparent conductive layer 8 for forming a pixel electrode. The transparent conductive layer 8 is made of an ITO material.

The patterning process used in the present invention is a process of exposure, development, etching, and photoresist removal which is conventionally used in the prior art. The color contained in a specific pixel unit can be determined according to actual needs.

In the liquid crystal panel using the above color filter, the red pixel unit 3, the green pixel unit 4, the blue pixel unit 5, and the mixed color pixel unit 6 are respectively controlled by separate driving IC elements. System. The mixed color pixel unit 6 is also controlled by a driving IC element. When the voltage of the mixed color pixel unit 6 is turned on, that is, by changing the arrangement state of the liquid crystal molecules, the mixed color pixel unit 6 has light passing through, The red sub-pixel, the green sub-pixel, and the blue sub-pixel of the mixed-color pixel unit 6 simultaneously transmit light, and white light formed by mixing a red sub-pixel, a green sub-pixel, and a blue sub-pixel is displayed. When the mixed color pixel unit 6 has no light passing through, the red sub-pixel unit, the green sub-pixel unit and the blue pixel unit in the mixed color pixel unit 6 are opaque, that is, displayed in a black occlusion state.

Compared with the color filter of the prior art three-color display, the newly added mixed color pixel unit forms a white display by mixing red sub-pixels, green sub-pixels and blue pixels, and realizes four colors of the color filter. The display enhances and enriches the display brightness of the image, realizes the requirement of high brightness of the color filter, effectively improves the display quality of the image, and enhances the user experience. At the same time, the color filter with four color pixel units can be produced by using only three patterning processes, which improves the production efficiency and greatly reduces the production cost.

With continued reference to FIG. 5, an embodiment of the present invention provides a process for fabricating the color filter structure described above, the method comprising the following steps.

In this embodiment, each sub-pixel region includes pixel units of four colors, which are a red pixel unit, a green pixel unit, a blue pixel unit, and a mixed color pixel unit, and the mixed color pixel unit is composed of three colors: red, green, and blue. The sub-pixel unit of color is composed. A mixed color pixel unit composed of three colors of red, green, and blue displays white.

In this embodiment, a red photoresist is coated on the glass substrate of step S1, and a red pixel unit is simultaneously formed on the corresponding position of the substrate by performing a exposure, development, etching, and photoresist removal process by patterning the mask. Red sub-pixel unit in the mixed color pixel unit; repeating the above steps to simultaneously form the green sub-pixel unit in the green pixel unit and the mixed color pixel unit, the green sub-pixel unit being in close contact with the red sub-pixel unit; repeating the above steps and forming at the same time Blue pixel unit and The blue sub-pixel units in the mixed color pixel unit collectively form a mixed color pixel unit that is in close contact with the green sub-pixel unit. The red sub-pixel unit, the green sub-pixel unit, and the blue sub-pixel unit are mixed and displayed in white. It should be noted that, in this step, the formation of the red pixel unit, the green pixel unit, and the blue pixel unit is in no particular order, and further, the red sub-pixel unit, the green sub-pixel unit, and the blue sub-pixel in the mixed-color pixel unit The order of the units is also in no particular order. Alternatively, a protective layer may be applied on the substrate on which step S2 is completed for flattening the color pixel regions and the black matrix. A transparent conductive layer is sputtered on the protective layer for forming a pixel electrode.

The red pixel unit, the green pixel unit, the blue pixel unit, and the mixed color pixel unit in the color filter are respectively controlled by separate driving IC elements. The mixed color pixel unit is also controlled by a driving IC element. When the voltage of the mixed color pixel unit is turned on, that is, the mixed color pixel unit has light passing through by changing the arrangement state of the liquid crystal molecules, the mixed color pixel The red sub-pixel unit, the green sub-pixel unit, and the blue sub-pixel unit in the unit simultaneously transmit light, and white light formed by mixing the red sub-pixel unit, the green sub-pixel unit, and the blue sub-pixel unit is displayed. When the mixed color pixel unit has no light passing through, the red sub-pixel unit, the green sub-pixel unit, and the blue sub-pixel unit in the mixed color pixel unit are opaque, that is, displayed in a black occlusion state. Alternatively, a protective layer may be applied on the substrate on which step S2 is completed for flattening the color pixel regions and the black matrix. A transparent conductive layer is sputtered on the protective layer for forming a pixel electrode. It can realize four-color display of color filter, which not only reduces one patterning process, improves production efficiency, greatly reduces production cost, and can better reduce the production cost compared with the existing four-color color filter process. The embodiment of the present invention further provides a display device including the color filter in the first embodiment or the second embodiment. sheet. The display device may, for example, further comprise an array substrate.

As shown in FIG. 7, one example of the display device is a liquid crystal display device including a color filter 300 and an array substrate 200 opposed to each other, and the color filter 300 and the array substrate 200 form a liquid crystal cell through the sealant 300. The liquid crystal layer 400 is filled in the liquid crystal cell. The liquid crystal display device may further include a backlight 500.

The display device can be a liquid crystal display, a liquid crystal panel, a liquid crystal computer or other display device. The display device of the embodiment of the invention can improve the product image by using the color filter in the first embodiment Like the brightness of the display, it satisfies the customer's demand for high brightness; 彩色 The color filter in the second embodiment can improve the color saturation of the product image display and meet the customer's demand for color saturation. The display device can realize the four-color display of the liquid crystal display with a minimum of steps, improve the production efficiency, and greatly reduce the production cost; greatly improve and enrich the brightness and color of the picture, and effectively improve the display quality of the image. , enhance the user experience.

The above is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims.

Claims

Claim

1. A color filter comprising:

Substrate

a black matrix disposed on the substrate;

A color pixel region is located between the black matrices, the color pixel region including a plurality of sub-pixel regions, each of the sub-pixel regions including at least two color pixel units and a mixed color pixel unit.

The color filter according to claim 1, wherein the pixel unit of the at least two colors and the mixed color pixel unit are equal in size and have the same shape.

The color filter according to claim 1 or 2, wherein the pixel unit of the at least two colors comprises a red pixel unit, a green pixel unit, and a blue pixel unit, the mixed color pixel unit being red, It is composed of sub-pixel units of at least two colors of green and blue.

The color filter according to claim 3, wherein the red pixel unit is formed by the same patterning process as the red sub-pixel unit constituting the mixed color pixel unit;

And/or, the green pixel unit is formed by the same patterning process as the green sub-pixel unit constituting the mixed color pixel unit;

And/or, the blue pixel unit is formed by the same patterning process as the blue sub-pixel unit constituting the mixed color pixel unit.

A display device comprising the color filter of any one of claims 1-4.

6. A method of fabricating a color filter, comprising

Step S1, forming a black matrix on the substrate by using a patterning process;

The method of manufacturing a color filter according to claim 6, wherein the pixel unit of at least two colors is equal in size and shape in shape as the mixed color pixel unit.

The method of manufacturing the color filter according to claim 6 or 7, wherein the pixel unit of the at least two colors comprises a red pixel unit, a green pixel unit, and a blue pixel unit, and the mixed color pixel unit It is composed of sub-pixel units of at least two colors of red, green, and blue.

The method of fabricating a color filter according to claim 8, wherein the red pixel unit is formed by the same patterning process as the red sub-pixel unit constituting the mixed color pixel unit; and/or The green pixel unit is formed by the same patterning process as the green sub-pixel unit constituting the mixed color pixel unit;