JPS62153903A - Production of color filter for liquid crystal display body - Google Patents

Abstract

PURPOSE:To easily obtain reliefs having prescribed thickness for each of picture elements of respective colors with good accuracy by bringing a photosensitive material into tight contact with part or the entire surface of picture element having plural different colors and controlling the quantity of the light to be irradiated to the photosensitive material. CONSTITUTION:The picture elements 2 for red, green and blue formed by patterning, for example, the dichromic acid gelatin coated on a glass plate then dyeing and coloring the same. A photosensitive resin 3 is then coated on the picture elements 2 formed on the glass plate 1. The resin 3 is exposed through a filter 4 for adjusting the quantity of the light to be irradiated to the respective picture elements. The filter 4 is so adjusted that, for example, the part 4a does not allow the transmission of the light, the part 4b allows the transmission of 50% light and the part 4c allows the transmission of 100% light. The resin is thereafter developed, by which the reliefs 5 having the film thicknesses different with the picture elements as shown by C are obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a color filter for a liquid crystal display used in a color liquid crystal display device.

Conventional technology In a color liquid crystal display device that consists of a liquid crystal and a color filter that control the amount of light transmitted or reflected, if the control characteristics of the liquid crystal depend on the wavelength of light and the film thickness of the liquid crystal, it is possible to It is necessary to change the film thickness for each pixel (
For example, Television Society Technical Report EDsss 331
(1985)).

In that case, the thickness of the liquid crystal can be easily changed by changing the thickness of the color filter for each pixel.

Color filters are manufactured by imparting photosensitivity to denatured proteins such as gelatin, casein, or synthetic dyeing resin to create a pixel pattern, and then dyeing it, or by applying a resist onto the dyeing resin that has been applied in advance. A conventional method is to dye each pixel using

In these methods, in order to change the film thickness for each pixel of each color, the dyeing resin is used from the beginning to change the film thickness for each pixel of each color. It was applied thickly.

Problems to be Solved by the Invention In this case, there was a problem in that it was difficult to control the film thickness of the dyeable resin, and the film also shone at the boundaries between pixels, making it impossible to obtain a predetermined film thickness.

Means to solve the problem: Apply photosensitive material to part or all of the pixels of different colors and control the amount of light irradiated to the photosensitive material to obtain a relief film with a thickness corresponding to each pixel of each color. .

Function: A photosensitive material that is in close contact with a portion or the entire surface of a plurality of pixels of different colors receives the light that has passed through the pixels and is sensitized. At this time, by changing the amount of light applied to the photosensitive material, a relief having a predetermined thickness can be obtained for each pixel of each color.

EXAMPLE FIG. 1 shows the process of manufacturing a color filter for a liquid crystal display according to the present invention. In the figure, 1 is a glass plate with a diameter of 6 oH, on which dichromate gelatin is coated, for example, is patterned, and then colored with a dye.
Red as shown in A.

Create each green and blue pixel 2. The film thickness may be approximately 1.0 μm.

Next, a photosensitive resin 3 is applied onto the pixels 2 formed on the glass plate 1. Next, as shown in B, the photosensitive resin 3 is exposed to light through a filter 4 for adjusting the amount of light hitting each pixel. This filter 4 is adjusted so that, for example, portions 4a do not transmit light, portions 4b5 and 4c transmit 60% of light, and portions 4C transmit 100% of the light. Thereafter, by developing, a relief 6 having a different thickness depending on each pixel is obtained as shown in C.

Example 1 4゜4'-bisdiazodiphenylamine (formula (2), abbreviated as BDDA) was added to a copolymer of N-vinyl-2-pyrrolidone (formula (1), abbreviated as Va) and methyl methacrylate. Used as a crosslinking agent in photosensitive materials.

was created.

CH-CH2・・・・・・・・・・・・(1)vp and M
The MA copolymer was synthesized as follows. VPe
soy (0.46 mol), methyl methacrylate 12y
(0.12 mol) was partially dissolved in methanol 6 and introduced into a 300 cc flask. 0.0317 of azobisisobutylnitrile (hereinafter abbreviated as AIBN), which is a polymerization initiator, was added to this flask, and the mixture was heated and stirred at 60° C. for 10 hours in a nitrogen atmosphere to polymerize. After the reaction, the polymer was precipitated using ethyl acetate, washed with acetone, and dried.

A photosensitive solution was prepared by adding 200 ml of BDDA as a crosslinking agent to the thus prepared polymer 107 and dissolving it in 90 y of methanol.

A glass plate having red, green, and blue pixels was prepared, and the above photosensitive liquid was applied onto the pixels using a spin code at 100 Or, p, m. After pre-baking this at 70''C for 20 minutes, no light passes through the red pixel area as shown in Figure 1B.
50% of the light is transmitted to the green pixel part, and 1 part of the light is transmitted to the blue pixel part.
I applied a filter that allows 00% transmission. From above, use a xenon arc lamp 500W (UX L-5 manufactured by Ushio Inc.)
00D-0), light was irradiated for 26 seconds with the distance between the light source and the sample set to 1 eim.

After that, a color filter was prepared by immersing it in 15% methyl ketone of 2-propertool for 2 minutes and post-baking at 150''C for 10 minutes.The film thickness of this color filter was measured using a contact type step needle (Tencor Instrument). The results of measurement using Alpha 5tep (manufactured by Co., Ltd.) are shown in FIG.

The red pixel area was 1.0±0.18 μm, the recording pixel area was 1.60 μm, and the blue pixel portion was 2.3±0.1 μm.

Example 2 A diazo resin obtained by condensation polymerization of 4,4'-bisdiazophenylamine and formaldehyde was added to a polyvinyl acetate emulsion with polyvinyl alcohol added thereto and used as a photosensitive material. Similarly to 1, a glass having red, green, and blue pixels was used, and 150 Or, p, m was applied onto the pixels using a spin code. After drying this at room temperature, as shown in Figure 1B, no light passes through the red pixel area, 50% light passes through the green pixel area, and 100% light passes through the blue pixel area. I applied a filter to make it worse. Light was irradiated from above using a xenon arc lamp 5ooW for 20 seconds with the distance between the light source and the sample set to 16 cm. Thereafter, water washing and development were performed, followed by post-baking at 100°C for 10 minutes to produce a color filter.

When the film thickness of this color filter was measured in the same manner as in Example 1, it was found to be 0.8 μm + 0.1 μm in the red pixel portion, 1.4 μm ± 0.1 μm in the green pixel portion, and 2.0 μm + 0.1 μm in the blue pixel portion.
It was 1 μm.

A comparative photosensitive solution was prepared by dissolving 20% ammonium dichromate, 6 g of an aqueous solution, 2% chromium alum, and 1 y of an aqueous solution in 20% gelatin, 25 y of an aqueous solution. This photosensitive solution was applied to the same type of glass as in Example 1 at 150 Or, p.
, m, was applied with a spin cord. The xenon lamp used in Example 1 was applied to the glass plate coated with this photosensitive liquid.
After irradiating light for 2 minutes through a mask with a hole of 00 μm x 200 μm, it was immersed in a red dye aqueous solution to produce a red pixel. Next, apply a photosensitive liquid to this glass plate at 100 or
, p, m with a spin code, and after going through the steps described above, it was immersed in an aqueous green dye solution to create a recording pixel next to the red pixel. Furthermore, apply 50 ml of photosensitive liquid to this glass plate.
Or, p, and m were coated with a spin code, and a blue pixel was created next to the recording pixel using an aqueous blue dye solution.

This color filter has light between pixels, which is 1.0±0.2 μm in the red pixel area and 1.2±0 μm in the 1 recording pixel area.
5 μm 1 blue pixel part was 1.4 +0.6 μm 0 Effects of the Invention According to the manufacturing method of the present invention, a photosensitive material is closely attached to a part or the entire surface of a plurality of pixels of different colors, and the amount of light irradiated to the photosensitive material is reduced. By controlling it, a relief having a predetermined film thickness can be easily obtained with high precision for each pixel of each color.

[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 graph showing the measurement results of the film thickness of the color filter obtained according to the present invention. 1o ・ 1...Glass plate, 2...Pixel, 3...
...Photosensitive material, 4...Filter, 6...
...Relief. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Red pixel Shikei Kenga ← Mizute direction →

Claims (6)

[Claims] (1) A photosensitive material layer is formed in close contact with a portion or the entire surface of a plurality of pixels of different colors, and the photosensitive material is exposed and developed by controlling the amount of light irradiated to each part to be different. A method for manufacturing a color filter for a liquid crystal display, characterized in that relief having a predetermined film thickness that differs for each pixel of each color is obtained by doing so. (2) The method for manufacturing a color filter for a liquid crystal display according to claim 1, characterized in that the photosensitive material is a photosensitive material that is insolubilized by crosslinking a photoreactant with a polymer compound. (3) The method for producing a color filter for a liquid crystal display according to claim 2, wherein the photoreactant is a diazo compound. (4) Production of a color filter for a liquid crystal display according to claim 3, wherein the diazo compound is 4,4'-bisdiazophenylamine or a condensate of 4,4'-bisdiazophenylamine and formaldehyde. Law. (5) The method for producing a color filter for a liquid crystal display according to claim 2, wherein the polymer compound is an acrylic resin. (6) The method for producing a color filter for a liquid crystal display according to claim 2, wherein the polymer compound is polyvinyl acetate.