JPS62153904A - Production of color filter for liquid crystal display body - Google Patents

Abstract

PURPOSE:To obtain a color filter having a black matrix which has good accuracy and substantial black chromaticity by coating a photosensitive material on a transparent substrate and subjecting the parts required as picture elements to exposure and development, then coating a black coating compd. thereon and etching the same. CONSTITUTION:The photosensitive resin 2 is coated over the entire surface on the transparent substrate 1 and is exposed by using a photomask 3 designed to allow the passage of light only to the parts preliminarily intended the picture elements and to prohibit the passage of the light to the black matrix part. The resin is then developed by warm water so that only the exposed parts remain. The black coating compd. 4 is uniformly coated over the entire surface and is subjected to etching by using hydrogen peroxide water after drying. The exposed parts of the photoresist film swell by the hydrogen peroxide water and are dislodged together with the black part coated thereon, which the black part is windowed. The black matrix 5 is formed by the remaining part. The stages for coating the dyeable photosensitive resin on the picture element parts, subjecting the resin to exposure and development then to patterning of the picture elements and immersing the substrate into a dyeing liquid to dye the resin are repeatedly executed for each of R, G and B colors, by which the good color filter is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a color filter used in a color liquid crystal display device that combines a color filter and a liquid crystal.

Conventional technology Conventionally, the Cassie filter for color liquid crystal display devices is made by coating a photosensitive resin on a transparent substrate, exposing and developing it to create pixel reliefs, and then coloring it with R, G, and B colors by dyeing, etc. R
, G, and B patterns were printed.

Problems to be Solved by the Invention However, when trying to create a black matrix of thin lines between pixels, there is no good dye that can be dyed black using dyeing methods, and it is necessary to dye with a mixture of two or three colors of dye. However, there were problems such as unevenness depending on the dyeing conditions and inability to reproduce black with sufficient density.

In addition, the printing method has the disadvantage that it is difficult to print thin lines of about 2 μm, and if the lines are thick, the pixel area becomes smaller due to blurring at the intersections.

Means for Solving the Problems A photosensitive material is coated on a transparent substrate, and after exposing and developing the portions necessary for pixels, a black paint is coated and etching is performed to form a black matrix. After that, a pixel portion is formed.

The photosensitive material in the pixel area swells due to the etching after the black paint is applied, and the coating applied on top of it swells. It falls off along with the film, and a window is formed in the black coating area, forming a black matrix with high precision. The subsequent formation of pixel parts can be done by filling the spaces between the black matrices with dyeable photosensitive resin and forming pixels by dyeing or by printing, making it easy to produce high-precision color filters. be able to.

EXAMPLE An example of the present invention will be described below. As shown in FIG. 1A, a photosensitive resin 2 was applied over the entire surface of a transparent substrate 1 using a method such as a spin cord. As photosensitive resin 2, a mixture of polyvinyl alcohol and ammonium dichromate was used.

Next, as shown in FIG. 1B, exposure was carried out with an ultra-high pressure mercury lamp using a photomask 3 designed to allow light to pass through only the pixel area, but not to allow light to pass through the black mask area.

After the exposure was completed, development was carried out with warm water as shown in C, leaving only the exposed areas. Next, as shown in D, black paint 4 containing gelatin and carbon in a ratio of 3:5 was uniformly applied over the entire surface. After drying, etching was performed using hydrogen peroxide water as shown in E. The exposed portion of the photoresist film was swollen by the hydrogen peroxide solution and fell off together with the black portion painted on it, a window was opened in the black portion, and a black matrix 6 was formed in the remaining portion.

A dyeable photosensitive resin made of gelatin and ammonium dichromate is applied to the pixel area, and the pixel is patterned by exposure and development. , B. The process was repeated for each color to obtain a good color filter.

A good color filter was also obtained by printing each color of R, G, and B on the pixel portion by offset printing after forming the black matrix.

A liquid crystal 6 is held between transparent substrates 1 and 1'. A color filter 7 and a common electrode 8 formed of a transparent electrode film are laminated in this order on the upper transparent substrate 1. A pixel electrode 9 formed of a thin film field effect transistor (hereinafter abbreviated as TPT) and a transparent conductive film driven by the TPT is supported on the lower transparent substrate 1'. 1o
and 10' are polarizing plates arranged so that their polarization axes are parallel to each other. The alignment of the molecules of the liquid crystal 6 is controlled by the alignment films 11 and 11'.

The liquid crystal panel is configured as described above, and the white 6''-
' When the TPT is driven in accordance with the pixel signal and the voltage applied to the liquid crystal layer is changed at the same time as colored light is irradiated, the amount of light passing through the liquid crystal layer changes accordingly, and a color image is reproduced.

Effects of the Invention According to the present invention, it is possible to produce a color filter coated with a black paint, etched with high accuracy, and having a black matrix with sufficient blackness.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the process of manufacturing a color filter for a liquid crystal display according to the present invention, and FIG. 2 is a cross-sectional view of an example of a panel of a color liquid crystal display device constructed using the color filter for a liquid crystal display according to the present invention. It is a diagram. 1...Transparent substrate, 2...Photosensitive resin, 3
...Photomask, 4...Black paint, 6
...Black matrix.

Claims (4)

[Claims] (1) A black matrix is formed by applying a photosensitive material onto a transparent substrate, exposing and developing the areas necessary for pixels, then applying black paint to the entire surface, and etching to remove the photosensitive material. A method for manufacturing a color filter for a liquid crystal display, comprising the steps of: forming a pixel portion in a gap between the black matrices. (2) The method for manufacturing a color filter for a liquid crystal display according to claim 1, wherein the pixel portion is formed by dyeing a photosensitive dyeable resin. (3) A method for manufacturing a color filter for a liquid crystal display according to claim 1, wherein the pixel portion is formed by printing. (4) The method for producing a color filter for a liquid crystal display according to claim 1, wherein the black paint is a component consisting of carbon and gelatin.