KR100961955B1 - LCD and its manufacturing method - Google Patents

Abstract

The present invention relates to a liquid crystal display device and a manufacturing method thereof. A liquid crystal display device according to the present invention comprises: a first glass substrate; The second glass substrate; A liquid crystal layer disposed between the first glass substrate and the second glass substrate; A color filter formed by patterning a plurality of color resins in a plurality of pixel areas on the first glass substrate; A black matrix formed on the first glass substrate and partitioning the plurality of pixel regions from each other; And an overcoat layer stacked on the color filter and the black matrix and having recesses recessed toward the color filter such that a region in which the liquid crystal layer is disposed is formed between the first glass substrate and the second glass substrate. It features. As a result, in forming a region in which the liquid crystal layer is disposed between the first glass substrate and the second glass substrate, the number of manufacturing steps can be reduced and the manufacturing cost can be reduced.

Description

Liquid crystal display and its manufacturing method {LIQUID CRYSTAL DISPLAY AND MANUFACTURING METHOD THEREOF}

1 is a cross-sectional view of a region of a liquid crystal display according to the present invention;

2A through 2E are views illustrating a manufacturing process of the liquid crystal display according to the present invention.

* Explanation of symbols for the main parts of the drawings

10: first glass substrate 12: color filter

14 black matrix 16 overcoat film

18: recess 20: second glass substrate

30: pixel electrode 40: common electrode

50: liquid crystal layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display device, and more particularly, to a liquid crystal display device and a method for manufacturing the liquid crystal layer, the thickness of which is determined by a recess formed in the overcoat film.                         

In general, a twisted nematic (TN) type thin film transistor (TFT) liquid crystal display (LCD) injects a liquid crystal between an upper plate and a lower plate, and an electric field is applied between the common electrode and the pixel electrode formed on the plate for each pixel, It is a device that composes the screen by changing the arrangement to pass or block the light.

The general formation of the TFT formed on the bottom plate is to laminate the gate layer on the glass substrate with aluminum or chromium, etc. Gates and gate lines are formed. Thereafter, a gate insulating film, amorphous silicon, silicon with an impurity, and a metal layer for forming a source drain electrode are stacked thereon, and a source drain electrode is formed through a masking technique using a second mask. In this case, a mask technique using a third mask is used to form an active region with a metal layer and a silicon layer containing impurities.

After laminating an insulating protective film thereon, a contact portion of the contact window, the gate line and the data line are exposed on the source portion again using a mask to complete the TFT structure. A pixel electrode connected through a source and a contact window of the TFT is formed on the passivation layer, and an alignment layer is formed thereon.

In the method of forming the top plate, a common electrode is formed on the glass substrate and the alignment layer is covered. In the case of a color LCD, a color filter is formed on the top plate. The color filter is formed by laminating films by mixing pigments with materials having photosensitivity for each of R, G, and B colors (Red, Green, Blue) and using a masking technique. In order to prevent the negative effect of the screen by forming a black matrix (BM: Black Matrix) first. The black matrix is formed by stacking a black resin layer of photosensitive material and leaving a pattern connecting the periphery of each pixel by a mask technique.

The inner surface of the upper plate and the lower plate formed by the above method is to distribute the spacer (Spacer) to maintain the gap between the two plates after the orientation.

On the other hand, in recent years, a color filter on array (COA) type LCD has been proposed. A COA type LCD uses a method of forming a film made of photosensitive R, G, B color resins instead of a protective film on a TFT. Therefore, a TFT is formed on the glass substrate, a color filter is formed instead of a protective film thereon, and a pixel electrode is formed thereon. Then, the aperture ratio is improved by forming a common electrode on a glass substrate on a corresponding top plate and forming only a black matrix pattern except color filters thereon.

On the other hand, Japanese Patent Laid-Open No. Hei 11-311786 discloses a COA type LCD in which a black matrix is formed on a lower plate. In addition, in the LCD disclosed in the Japanese Laid-Open Patent Publication, the cell gap between the upper plate and the lower plate is determined by the polymer wall without using a separate spacer. Here, the polymer wall includes a black matrix in which R, G, and B colored resins forming a color filter are sequentially stacked during the formation of the color filter, and a black matrix formed on the black matrix.

By the way, in the LCD disclosed in the Japanese Patent Laid-Open Publication, the cell gap between the upper plate and the lower plate and the thickness of the liquid crystal layer are formed by the polymer walls, but the mask technique must be used every time the black matrix and the black matrix are formed. There is a problem that the production cost increases.

Accordingly, an object of the present invention is to provide a liquid crystal display device and a method for manufacturing the same, in which the number of manufacturing steps is reduced and the manufacturing cost can be reduced in forming a region in which a liquid crystal layer is disposed between the first glass substrate and the second glass substrate. will be.

The above object is, according to the present invention, a liquid crystal display device having a first glass substrate, the second glass substrate, and a liquid crystal layer disposed between the first glass substrate and the second glass substrate, wherein the first glass substrate is provided. A color filter formed by patterning a plurality of color resins in a plurality of pixel areas on a glass substrate; A black matrix formed on the first glass substrate and partitioning the plurality of pixel regions from each other; And an overcoat layer stacked on the color filter and the black matrix and having recesses recessed toward the color filter such that a region in which the liquid crystal layer is disposed is formed between the first glass substrate and the second glass substrate. It is achieved by the liquid crystal display device characterized in that.

The thickness of the liquid crystal layer disposed between the first glass substrate and the second glass substrate may be determined by the recess.

In addition, the concave portion of the overcoat film is preferably formed by etching the overcoat film by a mask technique.

The colored resins of the plurality of colors include red, green and blue colored resins, and the black matrix is preferably formed by stacking the red, green and blue colored resins.

In addition, it is preferable that the first glass substrate be provided with a TFT structure.

In another aspect of the present invention, there is provided a liquid crystal display device having a first glass substrate and a second glass substrate bonded to the first glass substrate, wherein the first glass substrate is provided on the first glass substrate. Forming a color filter by patterning a plurality of color resins in a plurality of pixel areas; Forming a black matrix such that the plurality of pixel regions are partitioned from each other; Forming an overcoat layer on surfaces of the color filter and the black matrix; And forming a recessed portion recessed toward the color filter in an overcoat film formed on the surface of the color filter such that a region in which a liquid crystal layer is disposed is formed between the first glass substrate and the second glass substrate. It may be achieved by a method of manufacturing a liquid crystal display device.

Here, the concave portion of the overcoat film is preferably formed by etching the overcoat film by a mask technique.

The forming of the color filter and the forming of the black matrix may include forming a first color colored resin on a first image area and an area other than the image area on the first glass substrate; Exposing and developing the colored resin of the first color to form a first color color filter and a first black matrix layer; Forming a colored resin of a second color on the second image region on the first glass substrate and on the surface of the first black matrix layer; Exposing and developing the colored resin of the second color to form a second color matrix and a second black matrix layer laminated on the first black matrix layer; Forming a colored resin of a third color on a surface of the third image region and the second black matrix layer on the first glass substrate; And exposing and developing the colored resin of the third color to form a third black matrix layer stacked on the third color color filter and the second black matrix layer.

It is preferable to further include forming a TFT structure before forming the color filter on the first glass substrate.

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

As shown in FIG. 1, a liquid crystal display (LCD) according to the present invention includes a first glass substrate 10, a first glass substrate 10, and a first glass substrate 10. Formed on the liquid crystal layer 50 disposed between the second glass substrate 20, the color filter 12 formed in the plurality of pixel regions on the first glass substrate 10, and the first glass substrate 10. And a black matrix 14 for partitioning a plurality of pixel regions from each other, and an overcoat film 16 stacked on the color filter 12 and the black matrix 14.

The pixel electrode 30 is formed on the first glass substrate 10, and the color filter 12 is formed on the surface of the pixel electrode 30. In addition, a TFT (Thin Film Transistor) structure (not shown) is formed on the first glass substrate 10, and the formation of the TFT structure is the same as that of the above-described conventional technology, and a description thereof will be omitted.

The common electrode 40 is formed on a surface of the second glass substrate 20 that faces the first glass substrate 10.                     

The liquid crystal layer 50 is disposed in the recess 18 to be described later between the first glass substrate 10 and the second glass substrate 20 and is formed by an electric field formed between the pixel electrode 30 and the common electrode 40. The arrangement changes to transmit and block light.

The color filter 12 is formed by patterning color resins of three colors of red, green, and blue on a pixel area of the first glass substrate 10 by a masking technique. do. Here, the mask technique is a generalized technique and includes processes such as exposure, development, and pattern etching using a pattern mask.

The black matrix 14 is formed to protrude from the first glass substrate 10 toward the second glass substrate 20 and has a matrix shape so that a plurality of pixel regions are mutually partitioned. Here, the black matrix 14 increases the contrast of the liquid crystal display and prevents the negative effect of the screen due to the overlapping of colors.

The black matrix 14 of the liquid crystal display according to the present invention is formed by laminating three color resins of red, green, and blue, which form the color filter 12. Here, when the colored resins of three colors of red, green, and blue are stacked, the resin does not transmit light, thereby preventing the light from penetrating into the black matrix 14 region. do.

On the surface of the color filter 12 and the black matrix 14, an overcoat film which is a photosensitive transparent insulating film is formed. In the overcoat film 16 according to the present invention, the overcoat film 16 coated on the surface of the color filter 12, that is, the overcoat film 16 positioned in the pixel region, is recessed toward the color filter 12. 18) is formed. The liquid crystal layer 50 is disposed in the recess 18, and the liquid crystal layer 50 is disposed between the first glass substrate 10 and the second glass substrate 20 by the valley depth of the recess 18. The thickness of is determined. In addition, the thickness of the overcoat layer 16 determines the cell gap between the first glass substrate 10 and the second glass substrate 20 together with the above-described black matrix 14. Here, it is preferable to adjust the thickness of the overcoat film 16 and the black matrix 14 and the bone depth of the concave portion 18 so that the thickness of the liquid crystal layer 50 is approximately 5 μm.

The manufacturing process of the liquid crystal display device according to the present invention having the above configuration will be described with reference to FIGS. 2A to 2E.

First, a first glass substrate 10 having a TFT structure is prepared. At this time, a pixel electrode is formed on the first glass substrate 10 on which the TFT structure is formed (see FIG. 2A). Then, the color filter 12 and the black matrix 14 are formed on the first glass substrate 10 in the following manner. First, a red color is formed in the image region on the first glass substrate 10 except for the first image region (the region where the red color filter 12 is formed) and the image region, that is, the region where the black matrix 14 is formed. The colored resin is used to form a red color filter 12 and a first black matrix layer 14a, respectively, using a mask technique (see FIG. 2B). Then, a region other than the second image region (the region where the green color filter 12 is formed) and the image region among the image regions on the first glass substrate 10, that is, the surface of the first black matrix layer 14a. The green color resin is formed using a mask technique to form a green color filter 12 and a second black matrix layer 14b, respectively (see FIG. 2C). Then, the third image area (the area where the blue color filter 12 is formed) and the image area except the image area of the image area on the first glass substrate 10, that is, on the surface of the second black matrix layer 14b. The blue color resin is formed using the mask technique to form the green color filter 12 and the third black matrix layer 14c, respectively, so that the pattern and the black matrix of the color filter 12 are formed on the first glass substrate 10. Formation of 14 is completed (see FIG. 2D).

Then, the overcoat film 16 is formed on the surface of the color filter 12 and the black matrix 14 formed on the first glass substrate 10 (FIG. 2E). Then, the concave portion 18 is formed on the surface of the color filter 12 among the overcoat film 16, that is, the overcoat film 16 formed in the pixel region through a mask technique (see FIG. 1). Here, in the mask used in the mask technique, slits corresponding to the recesses 18 for exposure are formed, and the recesses 18 are formed through a process such as exposure and development.

Then, after bonding the second glass substrate 20 and the first glass substrate 10 on which the common electrode 40 is formed, the liquid crystal is injected into the recess 18 to seal the TFT panel. When the production of the TFT panel is completed, the manufacturing of the liquid crystal display device is completed by mounting a drive IC for driving the TFT, connecting the drive IC to the control PCB, and installing a backlight.

In the above-described embodiment, the color filter 12 and the black matrix 14 have been described as an example of a COA type liquid crystal display device formed on the first glass substrate 10 having the TFT structure, but the color filter 12 The black matrix 14 may be formed on the second glass substrate 20.

In addition, in the above-described embodiment, the pixel electrode 30 is formed between the color filter 12 and the first glass substrate 10, but after the color filter 12 is formed, the pixel electrode 30 may be formed on the surface of the color filter 12. Of course it can.

As described above, the color filter is stacked on the color filter 12 and the black matrix 14 so that an area in which the liquid crystal layer 50 is disposed is formed between the first glass substrate 10 and the second glass substrate 20. By providing the overcoat film 16 having the concave portion 18 recessed toward (12), the number of manufacturing steps of the liquid crystal display device can be reduced, and the manufacturing cost can be reduced.

As described above, according to the present invention, there is provided a liquid crystal display device and a method of manufacturing the same, which reduce the number of manufacturing steps and reduce the manufacturing cost.

Claims (9)

A liquid crystal display device having a first glass substrate and a second glass substrate facing each other, and a liquid crystal layer disposed between the first glass substrate and the second glass substrate. A color filter formed by patterning a plurality of color resins in a plurality of pixel areas on the first glass substrate; A black matrix formed on the first glass substrate and partitioning the plurality of pixel regions from each other; And an overcoat layer stacked on the color filter and the black matrix and having recesses recessed toward the color filter such that a region in which the liquid crystal layer is disposed is formed between the first glass substrate and the second glass substrate. A liquid crystal display device. The method of claim 1, And a thickness of the liquid crystal layer disposed between the first glass substrate and the second glass substrate is variable according to the depth of the recess. The method of claim 2, And the concave portion of the overcoat layer is formed by etching the overcoat layer by a mask technique. The method of claim 2, The colored resin of the plurality of colors comprises a colored resin of red, green and blue, And the black matrix is formed by laminating the colored resins of red, green, and blue. The method according to any one of claims 1 to 4, And a TFT structure on the first glass substrate. In the manufacturing method of a liquid crystal display device having a first glass substrate and a second glass substrate to be bonded to the first glass substrate, Forming a color filter by patterning a plurality of color resins in a plurality of pixel areas on the first glass substrate; Forming a black matrix such that the plurality of pixel regions are partitioned from each other; Forming an overcoat layer on surfaces of the color filter and the black matrix; And forming a recessed portion recessed toward the color filter in an overcoat film formed on the surface of the color filter such that a region in which a liquid crystal layer is disposed is formed between the first glass substrate and the second glass substrate. A manufacturing method of a liquid crystal display device. The method of claim 6, And the concave portion of the overcoat layer is formed by etching the overcoat layer by a mask technique. The method of claim 7, wherein Forming the color filter and forming the black matrix, Forming a colored resin of a first color in a first image region and a region other than the first image region on the first glass substrate; Exposing and developing the colored resin of the first color to form a first color color filter and a first black matrix layer; Forming a colored resin of a second color on the second image region on the first glass substrate and on the surface of the first black matrix layer; Exposing and developing the colored resin of the second color to form a second color matrix and a second black matrix layer laminated on the first black matrix layer; Forming a colored resin of a third color on a surface of the third image region and the second black matrix layer on the first glass substrate; And forming a third black matrix layer laminated on the third color color filter and the second black matrix layer by exposing and developing the colored resin of the third color. The method of claim 8, And forming a TFT structure before forming the color filter on the first glass substrate.

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