JPH0821995A - Color liquid crystal display device and its manufacture - Google Patents

Abstract

PURPOSE:To prevent the occurrence of discontinuity at a transparent electrode directly laminated on a color filter. CONSTITUTION:Respective filter components 3R, 3G, and 3B are formed on a transparent substrate 1 including a black matrix 2 so that an adjacent part formed later is superposed on the adjacent part previously formed. Thus, interstices are not formed between respective filter components 3R, 3G and 3B, so that the discontinuity is prevented from occuring on the transparent electrode 5 directly formed thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color liquid crystal display device and a manufacturing method thereof.

[0002]

2. Description of the Related Art FIG. 2 shows a part of an example of a conventional color liquid crystal display device. In this color liquid crystal display device, the transparent substrate 1 made of one glass or the like has a film thickness of 500 to 500 made of chromium or the like on the inner surface (the surface facing the other transparent substrate).
A black matrix 2 as a light-shielding film having a thickness of about 1000 Å is provided in a stripe shape or a lattice shape. Further, the color filter elements 3R, 3G, and 3B of three colors of R (red), G (green), and B (blue) are striped or mosaic-shaped over the inner surface of the transparent substrate 1 and the edges of the surface of the black matrix 2. It is provided in. In this case, the width T of the color filter elements 3R, 3G, 3B is somewhat larger than the spacing D between the black matrices 2 in consideration of misalignment with the black matrix 2 and the arrangement pitch P of the black matrices 2. Is getting smaller to some extent. As a result, the color filter element 3
Both ends of R, 3G and 3B are provided on the black matrix 2 and adjacent to the color filter elements 3R and 3R.
A gap 4 is formed between G and 3B to some extent. A transparent electrode 5 made of ITO is provided on the upper surfaces of the color filter elements 3R, 3G, 3B and the like, and an alignment film 6 is provided on the upper surfaces thereof.

[0003]

By the way, in such a conventional color liquid crystal display device, in the case of forming the color filter 3 composed of a plurality of types of color filter elements 3R, 3G, and 3B, as an example, the black matrix 2 is used. A red layer is formed on the entire upper surface of the transparent substrate 1 including, the red layer is photolithographically formed into a stripe shape or a mosaic shape to form a red filter element 3R, and then a green layer is formed on the entire upper surface. Similarly, the green filter element 3G is formed, then the blue layer is formed on the entire upper surface, and the blue filter element 3B is similarly formed from this blue layer. However, each filter element 3R, 3G,
The film thickness of 3B is relatively thick, about 1 to 2 μm, in order to obtain the color separation characteristics required for the color filter. On the other hand, when the red, green, and blue color layers are formed into a stripe shape or a mosaic shape by photolithography, unnecessary portions are removed by development. Therefore, for example, as shown in FIG. 3, each filter element 3R, 3G, 3B
The side part of may have an inverse taper shape. On the other hand, when a transparent electrode is laminated on the color filter, some unevenness is generated on the color filter surface, so the transparent electrode was conventionally laminated through a protective film. Are mixed in and cause a decrease in product yield. Therefore, it is currently under study to directly stack the transparent electrode on the color filter. However, when the transparent electrode 5 is directly formed by depositing ITO on the entire upper surface of the color filter 3, for example, as shown in FIG. 3, the cross section formed between the filter elements 3R, 3G, and 3B has a substantially trapezoidal shape. The entire inner surface of the gap 4 of IT
There is a problem that it is difficult to cover the O5a, and thus the transparent electrode 5 in this portion is likely to be broken. The object of the present invention is to produce in a good yield with fewer steps,
It is an object of the present invention to provide a color liquid crystal display device capable of preventing breakage of a transparent electrode and a manufacturing method thereof.

[0004]

According to the present invention, a color filter is provided on a transparent substrate containing a black matrix so that adjacent color filters are in close contact with each other, and a transparent electrode is provided thereon. .

[0005]

According to the present invention, since the adjacent color filter elements are in close contact with each other, no gap is formed between the color filter elements, and thus a gap having a substantially trapezoidal cross section is formed between the color filter elements. It is possible to prevent disconnection of the transparent electrode formed on the transparent electrode.

[0006]

FIG. 1 shows the essential parts of a color liquid crystal display device according to an embodiment of the present invention. In this figure, the same reference numerals are given to the same names as those in FIG. 2, and the description thereof will be omitted as appropriate. In this color liquid crystal display device, color filter elements 3R, 3G and 3B of three colors are provided in a stripe shape or a mosaic shape on the upper surface of a transparent substrate 1 including a black matrix 2. In this case, the adjacent color filter elements 3R, 3G, 3B are in close contact with each other. Then, the color filter element 3R,
A transparent electrode 5 made of ITO is directly provided on the upper surface of 3G, 3B, etc., and an alignment film 6 is provided on the upper surface thereof.

Here, the color filter elements 3R, 3G,
An example of a method for forming 3B will be described. First, a red layer is formed on the entire upper surface of the transparent substrate 1 including the black matrix 2, and then the red layer is formed into a stripe shape or a mosaic shape by photolithography to form the red filter element 3R. In this case, the width T of the red filter element 3R
₁ is somewhat larger than the arrangement pitch P of the black matrix 2 so that both ends thereof are located on the black matrix 2.

Next, a green layer is formed on the entire upper surface, and then the green layer is formed into a stripe shape or a mosaic shape by photolithography so that the green filter element 3G is formed adjacent to the red filter element 3R. In this case, the arrangement pitch P of the black matrix 2 is set so that the width T ₂ of the green filter element 3G overlaps the end portion adjacent to the red filter element 3R and the other end portion is located on the black matrix 2. It is made larger to some extent.

Next, a blue layer is formed on the entire upper surface, and then this blue layer is formed into a stripe or mosaic pattern by photolithography to form a blue filter element 3B.
Also in this case, the width T ₃ of the blue filter element 3B is set so that the adjacent portion of the blue filter element 3B and the red filter element 3R is the red filter formed earlier in the adjacent portion of the blue filter element 3B formed later. Overlays adjacent portions of element 3R, and also includes blue filter element 3B and green filter element 3G.
In the portion adjacent to and, the adjacent portion of the blue filter element 3B formed later is formed in the green filter element 3 formed earlier.
It is made larger than the arrangement pitch P of the black matrix 2 to some extent so as to overlap with the adjacent portion of G.

As described above, in this color liquid crystal display device, the adjacent filter elements 3R, 3G and 3B are in close contact with each other, so that each filter element 3
No gap is formed between R, 3G, and 3B, so that a gap having a substantially trapezoidal cross section is not formed between the filter elements 3R, 3G, and 3B, and thus the transparent electrode 5 formed directly thereon is not formed. It is possible to prevent disconnection. Further, since the adjacent portion of the filter element 3R, 3G, 3B that is formed next to each other is overlapped on the adjacent portion of the previously formed one, the conventional structure shown in FIG. Compared with the case, the accuracy of photolithography at the time of forming each of the filter elements 3R, 3G, and 3B can be relaxed to some extent, and the yield can be improved.

[0011]

As described above, according to the present invention, since the adjacent color filter elements are in close contact with each other, no gap is formed between the color filter elements, and therefore the color filter elements are not separated from each other. It is possible to prevent a disconnection from occurring in a transparent electrode directly formed on the gap without forming a gap having a substantially trapezoidal cross section. As a result, the color liquid crystal display device can be manufactured at a low cost with a high yield in a smaller number of steps.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a color liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of an example of a conventional color liquid crystal display device.

FIG. 3 is a cross-sectional view shown for explaining problems of the conventional color liquid crystal display device.

[Explanation of symbols]

 1 Transparent substrate 2 Black matrix 3 Color filter 3R, 3G, 3B Color filter element 5 Transparent electrode 6 Alignment film

Claims (3)

[Claims] 1. A black matrix provided in a predetermined position on a transparent substrate, a color filter in which adjacent color filter elements are provided in close contact with each other on the black matrix, and a black filter is provided directly on the color filter. And a transparent electrode, which is a color liquid crystal display device. 2. A black matrix is formed on a transparent substrate, and a color filter is formed on the transparent substrate, and adjacent portions of those adjacent to each other on the black matrix are formed first. And a transparent electrode is directly formed on the color filter so that the transparent electrode is directly formed on the color filter. 3. The method of manufacturing a color liquid crystal display device according to claim 2, wherein the color filter is formed by photolithography.