JPH04122914A - Color liquid crystal display device - Google Patents

Abstract

PURPOSE:To eliminate the need for spacers which are distributed on a substrate and to eliminate the need for the time and distribution device for the distribution by providing a black matrix which has a spacer function in an area other than a picture element part on a color filter substrate. CONSTITUTION:Organic pigment is dispersed uniformly in photosensitive resin, which is applied on a glass substrate 11 to form a color filter pattern by photolithography. This process is repeated for three colors which are red (R), green (G), and blue (B), thereby arraying the primary colors. An overcoat layer 9 is formed on this color filter pattern and an indium tin oxide (ITO) transparent electrode 10 is further formed. On this color filter substrate 1, the stripped black matrix 5 which serves for the spacer function and is 45 mum wide and 5 mum high is formed of metallic chromium by photolithography technique between picture elements 7 at random longitudinally and laterally to 200 mum.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a color liquid crystal display device.

[Prior Art] Color display technology using liquid crystals has been put into practical use in various fields such as liquid crystal televisions. In order to perform high-definition color display using a liquid crystal, it is necessary to consider the contrast viewing angle and to prevent unevenness due to the position of the gap. To this end, it is important to superimpose two substrates containing color filters with high precision while maintaining a uniform spacing. In a conventional color liquid crystal display device, as shown in FIG. 5, a color filter substrate 1 and a counter substrate 2 are separated from each other so as to maintain a uniform gap between the two substrates 1 and 2. It has a structure in which these two substrates are bonded together with a spacer 12 and a seal 3 containing a mixture of spacers, and the liquid crystal 6 is sealed therein. The spacers 12 need to be distributed over the display area at uniform intervals on the substrate to ensure screen uniformity.

[Problems to be Solved by the Invention] In a conventional color liquid crystal display device, a common method is to distribute and overlap spacers 12 on at least one of the color filter substrate 1 and the counter substrate 2. However, in such a method of adjusting the gap between two substrates, the difference in the distribution density of the spacers 12 on the substrates causes the gap to vary depending on the position, which may cause uneven hue of the screen ρ, or 12 is ω
If the pixel is located above the pixel, the brightness within the pixel will change, causing a problem of conilast non-uniformity within the screen. Another problem is that a dedicated device and a long period of time are not required to distribute the spacers 12 on at least one plate.

[Means for Solving the Problems] The gist of the present invention is to provide a spacer function to an area other than the pixel portion on a long filter substrate in a color liquid crystal display device in which a liquid crystal is sandwiched between two substrates having electrodes. The reason is that the black matrix is provided with a black matrix.

[Operation of the Invention] A black matrix is formed between pixels provided on a color filter substrate by, for example, a photolithography method. When the dimensions of this black matrix are made to match the dimensions of a spacer, the black matrix also functions as a spacer.

[Example code] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic sectional view of a color liquid crystal display device according to a first embodiment of the present invention, and FIG. 2 shows a state in which a black matrix 5 which also serves as a spacer is provided on a color filter substrate 1. The sectional view and hole 3 diagram shown are plan views of the color filter substrate 1. The manufacturing process of the color filter substrate 1 is as follows:
An organic pigment is uniformly dispersed in a photosensitive resin, this is applied onto a glass substrate 1], and a color filter pattern is formed by removing photolithogelafin. This process is red (R)
), green (G), and blue (B) 7. Repeat this process to arrange the three primary colors. An overcoat layer 9 and an indium tin oxide (ITO) transparent electrode 10 are formed on this color filter pattern. Then, on this color filter substrate 1, a strip-like black matrix 5 with a width of 45 μm and a height of 5 μm, which also serves as a spacer, is formed by using photolithography technology to form a strip-like black matrix 5 which also serves as a spacer and is randomly spaced between pixels 7 with a width of 45 μm and a height of 5 μm. Form. The color liquid crystal display device manufactured by this method was able to reduce the in-plane non-uniformity of the cap to 2 times that of the conventional method.

FIG. 4 is a plan view of a black matrix of the present invention which also functions as a spacer and is formed at the center of four pixels 7, each occupying 200 μm in length and width, with a length of 45 μm, a width of 45 μm, and a height of 5 μm. The color liquid crystal display device manufactured by this method was able to reduce the in-plane gap non-uniformity to one-tenth that of the conventional method.

Above 1. Table 1 shows a comparison between the second embodiment and the conventional example.

Note that the hue inconsistency due to the dispersion density of the spacer and the contrast non-uniformity due to the spacer on the pixel are values when the incidence rate of the conventional method is set as 100.

[Effects of the Invention] As explained above, in the present invention, a black matrix is formed on the color filter substrate 1 which also functions as a spacer, and this black matrix serves to keep the gap between the substrates uniform.

In the conventional example, after manufacturing a color liquid crystal display element, the spacer 12 on the pixel 7 changes the brightness within the pixel, causing in-plane contrast non-uniformity, and due to the difference in the dispersion density of the spacer 12, the gap varies depending on the position. However, in the present invention, the problems of the conventional example are solved and the yield is improved. Furthermore, in the assembly process of the liquid crystal display device, the spacers distributed on at least one of the substrates are no longer required, and the time and distribution device required for distribution are also no longer required.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing the first embodiment of the present invention, FIG. 2 is a sectional view showing the color filter of the first embodiment equipped with a black matrix that also functions as a spacer, and FIG. 2 is a plan view of the substrate shown in FIG. 2, FIG. 4 is a plan view of the second embodiment, and FIG. 5 is a sectional view showing a conventional color display liquid crystal panel. 0・・・・・・・・・Black matrix that also functions as a spacer, ・Pixel, ・Black matrix, ・Spacer

Claims (1)

[Claims] A color liquid crystal display device in which a liquid crystal is sandwiched between two substrates having electrodes, characterized in that a black matrix having a spacer function is provided in a region other than a pixel portion on a color filter substrate.