KR20070037114A - Liquid crystal display and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a liquid crystal display device in which a white color filter, an overcoat layer, and a column spacer are integrally formed, and a method of manufacturing the same. A black matrix disposed on a first transparent insulating substrate and a first transparent insulating substrate in units of subpixels. A red, green, blue, white color filter adjacent to each other, an overcoat layer formed on the front surface of the first transparent insulating substrate, and a pixel formed on the overcoat layer in a region corresponding to the black matrix; The white color filter, the overcoat layer, and the column spacer are integrally formed with the color filter substrate, and the transverse electric field is controlled in units of pixels through a switching operation to control the amount of light transmitted to the color filter substrate. Provided are a liquid crystal display device including an array substrate to be adjusted, and a liquid crystal layer filled between two substrates, and a method of manufacturing the same.

Liquid Crystal Display, RGBW, Overcoat Layer, Column Spacer

Description

Liquid crystal display and method for manufacturing the same {Liquid crystal display and method for manufacturing the same}

1 is a model diagram illustrating one pixel of a liquid crystal display according to the related art.

2 is a plan view illustrating a part of a liquid crystal display according to the related art.

3 is a cross-sectional view of a portion of a liquid crystal display according to the related art.

4 is a schematic diagram of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a part of the color filter substrate illustrated in FIG. 4.

6 is a cross-sectional view illustrating a part of the array substrate illustrated in FIG. 4.

7 is a flowchart illustrating a manufacturing method of a liquid crystal display according to an exemplary embodiment of the present invention.

8 is a cross-sectional view illustrating some steps of FIG. 7.

9 is a schematic structural diagram of a halftone mask used in some steps of FIG. 7.

(Explanation of symbols for the main parts of the drawing)

100: color filter substrate 101: first transparent insulating substrate

110: black matrix 120: red color filter

121: green color filter 122: blue color filter

130: over coat layer 131: white color filter

132: column spacer 200: array substrate

201: second transparent insulating substrate TFT: thin film transistor

210: gate insulating film 211: data line

220: protective film 221: common electrode

222: pixel electrode 300: liquid crystal layer

M: half-tone mask

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a manufacturing method thereof, and more particularly, to a liquid crystal display device having a transverse electric field system and a manufacturing method thereof.

The liquid crystal display injects a liquid crystal material having anisotropic dielectric constant between the upper color filter substrate and the lower array substrate, and adjusts the intensity of the electric field formed in the liquid crystal material to change the molecular arrangement of the liquid crystal material, thereby It is a display device which expresses a desired image by adjusting the amount of light transmitted. As the liquid crystal display, a thin film transistor liquid crystal display (TFT LCD) using a thin film transistor (TFT) as a switching element is mainly used.

Recently, with the introduction of the RGBW 4 subpixel structure in which white subpixels are added in addition to the red, green, and blue subpixels that are basically used in the liquid crystal display, it is possible to express various colors and improve white luminance.

1 is a schematic diagram showing one pixel of a liquid crystal display according to the related art, and shows one pixel of the liquid crystal display having the RGBW 4 subpixel structure. 2 and 3 are a plan view and a cross-sectional view of a part of a liquid crystal display having the RGBW 4 sub pixel structure as illustrated in FIG. 1.

Each pixel constituting the conventional liquid crystal display is composed of red, green, blue, and white subpixels R, G, B, and W, as shown in FIGS. 1 and 2, and each subpixel (R, G). , B, and W are formed with red, green, blue, and white color filters 20, 21, 22, and 23, respectively, as shown in FIG.

The red, green, blue, and white color filters 20, 21, 22, and 23 are made of red, green, and blue color resins, and the white color filter 23 is installed as a transparent filter without any color to adjust the amount of light. Done.

As shown in FIG. 3, the color filter substrate 10 included in the liquid crystal display device is disposed such that the first transparent insulating substrate 11, the black matrix 12 for blocking light leakage, and the black matrix 12 are bounded. The red, green, blue, and white color filters 20, 21, 22, and 23, the overcoat layer 30 for planarization, the column spacer 40 for maintaining a cell gap, and the like.

By the way, the liquid crystal display of the RGBW 4 sub-pixel structure in which the white color filter 23 is added has advantages such as various colors, improved white luminance, and increased contrast ratio (C / R). As the processes for forming the filter 23 are added, and the white color filter 23, the overcoat layer 30, and the column spacer 40 are all formed through separate processes, the RGB 3 subpixel structure is applied. Compared with this, there is a problem in that the manufacturing process is complicated and the number of processes increases to increase the production cost.

Accordingly, the technical problem to be achieved by the present invention is to form a white color filter, an overcoat layer, and a column spacer at a time in the RGB 4 subpixel structure, thereby simplifying the manufacturing process and reducing the number of processes, thereby reducing the production cost. It is to provide a liquid crystal display device.

Another object of the present invention is to provide a method of manufacturing a liquid crystal display device capable of efficiently manufacturing such a liquid crystal display device.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

The liquid crystal display according to the exemplary embodiment of the present invention for achieving the above technical problem is formed to be adjacent to each other in a sub-pixel unit and a black matrix disposed in a sub-pixel unit on a first transparent insulation substrate. An overcoat layer formed on the entire surface of the first transparent insulating substrate to cover the red, green, blue, and white color filters forming the pixel and bordering the black matrix, and the red, green, blue, and white color filters. And a column spacer disposed on the overcoat layer in units of pixels and positioned in a region corresponding to the black matrix, wherein the white color filter, the overcoat layer, and the column spacer are integrally formed. And controlling the transverse electric field on a pixel-by-pixel basis through a switching operation to determine the amount of light transmitted to the color filter substrate. And a liquid crystal layer filled between the array substrate to be adjusted and the color filter substrate and the array substrate.

The array substrate may include a second transparent insulating substrate, and a plurality of pixels in which regions are divided into gate lines and data lines arranged to cross each other on the second transparent insulating substrate, and each of the plurality of pixels may include a gate, A thin film transistor including a source and a drain electrode, and a common electrode and a pixel electrode formed in parallel with each other to generate a transverse electric field by a switching operation of the thin film transistor.

The white color filter, the overcoat layer, and the column spacer are made of acrylic resin and the like.

In addition, a method of manufacturing a liquid crystal display according to an exemplary embodiment of the present invention may include forming a black matrix on a first transparent insulating substrate and red, green, and blue adjacent to each other with the black matrix as a boundary. A color filter forming step of sequentially forming a color filter, a white color filter forming one pixel adjacent to the red, green, and blue color filters, an overcoat layer covering the entire surface of the first transparent insulating substrate, and the over An overcoat layer forming step of integrally forming column spacers disposed on a coat layer in a pixel unit and located in a region corresponding to the black matrix, and controlling a transverse electric field in pixels through a switching operation to the color filter substrate. An array substrate fabrication step of forming an array substrate for controlling the amount of light transmitted therethrough, and the color filter After laminating the substrate plate and the array is characterized in that it comprises a laminating and a liquid crystal injection step of filling the liquid crystal layer.

In the overcoat layer forming step, the white color filter, the overcoat layer, and the column spacer may be formed at once using a halftone mask in which a plurality of slit patterns are formed.

The thickness of the white color filter, the overcoat layer, and the column spacer may be adjusted by adjusting the size of the line region and the spacer region constituting the slit pattern for each region.

In the overcoat layer forming step, the white color filter, the overcoat layer, and the column spacer are formed of an acrylic resin or the like.

Specific details of other embodiments are included in the detailed description and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. Like reference numerals refer to like elements throughout.

Hereinafter, a liquid crystal display according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 4 to 6.

FIG. 4 is a schematic view illustrating a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 5 is a cross-sectional view illustrating a portion of the color filter substrate illustrated in FIG. 4, and FIG. 6 is a portion of the array substrate illustrated in FIG. 4. It is sectional drawing which shows.

Referring to FIG. 4, the liquid crystal display according to the exemplary embodiment of the present invention includes a color filter substrate 100, an array substrate 200, and a liquid crystal layer 300.

Referring to FIG. 5, the color filter substrate 100 may include a first transparent insulating substrate 101, a black matrix 110, red, green, and blue color filters 120, 121, and 122, a white color filter 131, The overcoat layer 130, the column spacer 132, and the like, and the overcoat layer 130 is integrally formed with the white color filter 131 and the column spacer 132.

The black matrix 110 is disposed on a first transparent insulating substrate 101 in subpixel units.

The red, green, blue, and white color filters 120, 121, 122, and 131 are formed to be adjacent to each other in subpixel units to form one pixel. The black matrix 110 is positioned at the boundary of each color filter 120, 121, 122, and 131.

The overcoat layer 130 is formed on the entire surface of the first transparent insulating substrate 101 to cover the red, green, blue, and white color filters 120, 121, 122, and 131 and the black matrix 110.

The column spacer 132 is formed on the overcoat layer 130 in units of pixels and is positioned in a region corresponding to the black matrix 110.

Here, the white color filter 131, the overcoat layer 130, and the column spacer 132 are formed at one time to have an integral shape, and thus are made of the same material.

An organic material having excellent planarization characteristics is used for the overcoat layer 130, an organic material having elasticity against external pressure is used as the column spacer 132, and a transparent color that can improve white brightness with the white color filter 131. Since organic materials are commonly used, select materials that meet these requirements, such as acrylic resins.

The array substrate 200 controls the transverse electric field on a pixel-by-pixel basis through a switching operation to adjust the amount of light transmitted to the color filter substrate 100 to implement various colors.

Referring to FIG. 6, the array substrate 200 may include a gate line (not shown), a data line 211, a thin film transistor (TFT), and the like, formed on the second transparent insulating substrate 201. It consists of a plurality of pixels provided.

The gate line (not shown) and the data line 211 are disposed to cross each other, and a thin film transistor TFT that performs a switching operation is formed at the crossing portion.

The thin film transistor TFT may include a gate electrode 202 formed on the second transparent insulating substrate 201, and a source electrode 206 spaced apart from the left and right with the semiconductor layer 203 made of an undoped amorphous silicon material interposed therebetween. ) And a drain electrode 207. At the interface between the source electrode 206 and the drain electrode 207 and the semiconductor layer 203, ohmic contact layers 204 and 205 made of n + hydrogenated amorphous silicon material heavily doped with n-type impurities are formed. do.

A gate insulating layer 210 is disposed between the gate electrode 202 and the semiconductor layer 203, and a passivation layer 220 made of an inorganic insulating material such as silicon nitride (SiNx) or an organic insulating material is disposed on the thin film transistor TFT. Is formed.

The common electrode 221 and the pixel electrode 222 may be made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), and may be formed on the passivation layer 220 in parallel to each other to form a thin film transistor (TFT). By generating a transverse electric field by the switching operation of the) to adjust the orientation of the liquid crystal layer (300). The common electrode 221 and the pixel electrode 222 may be disposed differently according to the pixel structure to be selected, or may be formed of an opaque metal material when the common electrode 221 and the pixel electrode 222 are formed in an inactive region.

The liquid crystal layer 300 is filled between the color filter substrate 100 and the array substrate 200.

Hereinafter, a method of manufacturing a liquid crystal display according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 7 to 9.

FIG. 7 is a flowchart illustrating a method of manufacturing a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 8 is a cross-sectional view illustrating some steps of FIG. 7, and FIG. 9 is a halftone mask used in some steps of FIG. 7. It is a schematic configuration diagram of the.

Referring to FIG. 7, a method of manufacturing a liquid crystal display according to an exemplary embodiment includes a color filter substrate manufacturing step S100, an array substrate manufacturing step S200, a bonding and a liquid crystal injection step S300, and the like.

The color filter substrate manufacturing step S100 may be subdivided into a black matrix forming step S110, a color filter forming step S120, and an overcoat layer forming step S130.

First, in the black matrix forming step S110, the black matrix 110 is formed on a first transparent insulating substrate 101 in subpixel units.

Next, in the color filter forming step (S120), each of the red, green, and blue color filters 120, 121, and 122 respectively corresponding to one sub-pixel is formed. The red, green, and blue color filters 120, 121, and 122 are formed by using the black matrix 110 as a boundary, and then, in the overcoat layer forming step (S130), the white color filter 131 is formed in a region corresponding to the white subpixel. ), The adjacent red, green, blue, and white color filters 120, 121, 122, and 131 form one pixel unit.

In the overcoat layer forming step (S130), the white color filter 131, the overcoat layer 130, and the column spacer 132 made of acrylic resin or the like are integrally formed. The white color filter 131 is formed to form one pixel adjacent to the red, green, and blue color filters 120, 121, and 122, and the overcoat layer 130 is formed of the black matrix 110 and the red, green, and blue colors. It is formed to cover the entire surface of the first transparent insulating substrate 101 to cover the color filters (120, 121, 122). In this case, the column spacer 132 is formed on the overcoat layer 130 in units of pixels and is positioned at a portion corresponding to the black matrix 110. In this case, the white color filter 131, the overcoat layer 130, and the column spacer 132 may be formed at a time by using the halftone mask M in which a plurality of slit patterns are formed.

As illustrated in FIG. 9, when the sizes of the line region L and the spacer region S constituting the slit pattern are adjusted for each region, the white color filter 131, the overcoat layer 130, and the column spacer ( 132 can be adjusted. Here, if the size of the line region L and the space region S forming the slit pattern can be adjusted, the amount of light is irradiated can be adjusted, so that the thickness of each region can be easily adjusted. Therefore, the overcoat layer 130, the white color filter 131, and the column spacer 132 may be patterned to a desired thickness by adjusting the size of the slit pattern.

Next, in the array substrate manufacturing step (S200), the array substrate 200 is manufactured to control the amount of light transmitted to the color filter substrate 100 by controlling the transverse electric field in units of pixels through a switching operation. The array substrate 200 divides regions of pixels by arranging a plurality of gate lines (not shown) and data lines 211 that cross each other on the second transparent insulating substrate 201, and thin film transistors (TFTs) on each pixel. ), And the process of forming the common electrode 221 and the pixel electrode 222.

Next, the process of adhering and injecting the liquid crystal (S300), bonding the color filter substrate 100 and the array substrate 200, and then filling the liquid crystal layer 300.

Conventionally, the color filter substrate is generally subjected to seven steps of forming a black matrix, forming a red color filter, forming a green color filter, forming a blue color filter, forming a white color filter, forming an overcoat layer, and forming a column spacer. It was.

However, according to the method of FIGS. 7 to 9, the process may be performed on the color filter substrate 100 by forming the black matrix 110, forming the red color filter 120, and forming the green color filter 121. In this case, the blue color filter 122 may be formed, the white color filter 131 having the integrated shape, the overcoat layer 130, and the column spacer 132 may be formed in five steps.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that.

Therefore, since the embodiments described above are provided to completely inform the scope of the invention to those skilled in the art, it should be understood that they are exemplary in all respects and not limited. The invention is only defined by the scope of the claims.

The liquid crystal display according to the preferred embodiment of the present invention as described above implements an RGB 4 sub pixel structure in which a white color filter, an overcoat layer, and a column spacer are integrally formed, thereby simplifying a manufacturing process and reducing the number of processes. The production cost can be reduced.

In addition, in the method for manufacturing a liquid crystal display device according to a preferred embodiment of the present invention, such a liquid crystal display device can be efficiently manufactured by using a halftone mask or the like.

Claims (7)

A first transparent insulating substrate, a black matrix disposed in subpixel units on the first transparent insulating substrate, red, green, blue, formed to be adjacent to each other in subpixel units to form one pixel and having the black matrix as a boundary portion; A white color filter, an overcoat layer formed on the entire surface of the first transparent insulating substrate so as to cover the red, green, blue, and white color filters, and formed in a pixel unit on the overcoat layer and corresponding to the black matrix. A color filter substrate including a column spacer positioned therein, wherein the white color filter, the overcoat layer, and the column spacer are integrally formed; An array substrate for controlling an amount of light transmitted to the color filter substrate by controlling a transverse electric field in units of pixels through a switching operation; And a liquid crystal layer filled between the color filter substrate and the array substrate. The method of claim 1, The array substrate, And a plurality of pixels, each of which is divided into a second transparent insulating substrate and a gate line and a data line arranged to cross each other on the second transparent insulating substrate, wherein each of the plurality of pixels includes a gate, a source, and a drain electrode. And a common electrode and a pixel electrode which are formed in parallel with each other and are formed in parallel to each other to generate a transverse electric field by the switching operation of the thin film transistor. The method of claim 1, The white color filter, the overcoat layer, the column spacer, A liquid crystal display device comprising an acrylic resin. Forming a black matrix on the first transparent insulating substrate; A color filter forming step of sequentially forming red, green, and blue color filters so that the black matrix is adjacent to each other; A white color filter adjacent to the red, green, and blue color filters to form one pixel, an overcoat layer covering the entire surface of the first transparent insulating substrate, and a black matrix disposed on the overcoat layer in units of pixels; An overcoat layer forming step of integrally forming a column spacer positioned at a region corresponding to the at least one column; An array substrate manufacturing step of forming an array substrate for controlling an amount of light transmitted to the color filter substrate by controlling a transverse electric field on a pixel basis through a switching operation; And And bonding the color filter substrate and the array substrate and then filling the liquid crystal layer and injecting the liquid crystal layer. The method of claim 4, wherein In the overcoat layer forming step, The white color filter, the overcoat layer, and the column spacer are formed at a time by using a halftone mask having a plurality of slit patterns. The method of claim 5, And controlling the size of the line region and the spacer region constituting the slit pattern for each region to adjust thicknesses of the white color filter, the overcoat layer, and the column spacer. The method of claim 4, wherein In the overcoat layer forming step, The white color filter, the overcoat layer, and the column spacer are formed of an acrylic resin.

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