JPS63311328A - Production of color filter for liquid crystal display body - Google Patents

Abstract

PURPOSE:To obtain reliefs of a prescribed film thickness by each of picture elements of respective colors by controlling the spectral sensitivity of a photosensitive material which is tightly adhered with the plural picture elements of different colors on part of the surface or over the entire surface, and sensitizing said photosensitive material by receiving the light transmitted through the picture elements. CONSTITUTION:A quartz glass plate 1 which has 50mm diameter and on which bichromated gelatin is coated is patterned and is then colored by dyeing, by which the respective picture elements 2 of red, blue and green are formed. The photosensitive material 3 is then coated on the picture elements 2 and further, white light (a light source such as xenon arc lamp or fluorescent lamp which radiates visible light is usable) is projected to the photosensitive material 3 through a transparent substrate 1 and the picture elements 2. This material is immediately developed to form the transparent reliefs 4, by which the color filters for the display body are obtd. The photosensitive material is thereby tightly adhered to part of the surface or the entire surface of the plural picture elements of the different colors and the spectral sensitivity of the photosensitive material can be controlled. The reliefs of the prescribed film thickness are thus easily obtd. for each of the picture elements of the respective colors with good accuracy.

Description

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

The main components of a conventional color liquid crystal display device are a liquid crystal that controls the amount of light transmitted through an electric field and a color filter that reproduces colors. In many cases, the control characteristics of liquid crystals depend on the wavelength of light and the thickness of the liquid crystal. That is, the optimum film thickness is different for each color (each transmitted wavelength). Therefore, in order to improve display image quality, it is necessary to change the film thickness for each pixel of a different color. (For example, Television Society of Japan Technical Report ED888 pp31 (1985)) For this reason, conventionally, for example, a color filter was created using the process shown in Figure 2, and the thickness of the liquid crystal layer was changed by controlling the film thickness of the color filter. was.

A conventional color filter creation process will be explained below.

First, a dyeable photosensitive material (such as a denatured protein such as gelatin or casein, or a synthetic dyeable resin made by adding dichromate, diazonium salt, etc. to impart photosensitivity) is applied to the glass substrate 5. After patterning, it is colored with a dye solution. These coating, patterning, and dyeing steps are repeated three times to create red, green, and blue pixels 6.

By finely adjusting the amount of dyeable photosensitive material applied to the glass substrate 5, the film thickness can be changed for each color.

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 swelled up at the boundaries of each pixel, making it impossible to obtain a predetermined film thickness.

Means to Solve the Problem By forming a photosensitive material layer with controlled spectral sensitivity on a part or the entire surface of a plurality of pixels of different colors, exposing and developing this layer, each pixel of each color is Obtain a relief of a predetermined film thickness.

Function: A photosensitive material that is in close contact with a portion or the entire surface of a plurality of pixels of different colors is exposed to light transmitted through the pixels. At this time, if the spectral sensitivity of the light-sensitive material is controlled, the degree of sensitivity will differ for each color, so a relief of a predetermined film thickness can be obtained for each pixel of each color.

Example As shown in FIG. 1 (A), a quartz glass plate 1 with a diameter of 5011 II 11 coated with geladine dichromate is patterned and then colored with dye to create red, green, and blue pixels 2. did. The film thickness was 1.0 μm. Next, the first
As shown in Figure (B), the photosensitive material 3 was applied onto the pixels 2. Furthermore, as shown in FIG. 1(C), a light source that emits visible light such as white light (xenon arc lamp, fluorescent lamp, etc.) can be used.

) was irradiated onto the photosensitive material 3 through the transparent substrate 1 and the pixels 2. This was immediately developed to create a transparent relief 4 as shown in FIG. 1(b), thereby obtaining the desired color filter for display.

Specific examples are shown below.

Example 1 - A copolymer of N-vinyl-2-pyrrolidone (formula (1) 1 or less, abbreviated as VP) and methyl methacrylate (hereinafter abbreviated as MMA) has 4,4 having an absorption at 380 rv to 560 n-
'Bisdiazodiphenylamine (formula (2) 1 or less BDD
A photosensitive material was prepared using A) as a crosslinking agent.

Formula (1) Formula (2) A copolymer of VP and MMA was synthesized as follows. 50 g (0.45 mol) of VP and 12 g (0.12 mol) of methyl methacrylate were dissolved in 60 g of methanol and introduced into a 300 cc flask. Into this flask, 0.031 g of azobisisobutyronitrile (hereinafter abbreviated as AIBN), which is a polymerization initiator, was added and polymerized by heating at 60° C. for 10 hours in a nitrogen atmosphere. After the reaction The polymer was precipitated using ethyl acetate, washed with acetone, and dried.

A photosensitive solution was prepared by adding 200 mg of BDDA as a crosslinking agent to 10 g of the polymer thus prepared and dissolving it in 90 g of methanol. This photosensitive solution was spin-coded onto the pixels using the glass having red, green, and blue pixels at 100 Or, p, m. This is 7
After baking at 0℃ for 20 minutes, use a xenon arc lamp 500W (Ushio IJUXI).

-500D-0), the distance between the light source and the sample is 3.
0 cm, and light was irradiated from the glass substrate side for 2 minutes as shown in FIG. After that, 2-Property Tools 15
% methyl ethyl ketone solution for 1 minute and then developed, then immersed in methyl ethyl ketone for 2 minutes, and then at 150°C.
, and post-baked for 10 minutes to create a color filter. The film thickness of this color filter was measured using a stylus-type film thickness measuring device (Tenker Instruments Alpha Step Tenc).
orInstrument Alpha 5tep
) The results of the measurements are shown in Figure 3. 1.0± in red pixel area
0.1 μm, 1.5±0.1 um in the green pixel area, and 2.2±0.1 um in the blue pixel area.

Example 2 The same polymer as in Example 1 was used in the photosensitive material. Add 400 na+ as a crosslinking agent to 10 g of this polymer.
A photosensitive solution was prepared by adding 200 mg of 7-dimethylamino-2-fluorenediazonium chloride (formula (3)) having an absorption of ~600 nm and dissolving it in 90 g of methanol.

Equation (3): A color filter was prepared using this photosensitive liquid under the same conditions as in Example 1 and using the same type of glass.

The pixel thickness of this color filter is 1.0 in the red pixel part.
±Q, 1 gm, 1.6 ± O, lum in the green pixel part, and 2.3 ± 0.1 μm in the blue pixel part.

Example 3 The same polymer as in Example 1 was used in the photosensitive material. 245n*~ as a crosslinking agent to 10g of this polymer
1-azidopyrene (formula (4)
) was added thereto and dissolved in 90 g of methanol to prepare a photosensitive solution.

Equation (4): A color filter was prepared using the same type of glass under the same conditions as Example 17 except that the photosensitive liquid was irradiated with light for 3 minutes. The pixel film thickness of this color filter is 1.0±0.1 μm in the red pixel portion and 1.6±0.1 μm in the green pixel portion.
1 am, and 2.2±0.1 μm in the blue pixel portion.

Example 4 The same polymer as in Example 1 was used in the photosensitive material. A photosensitive solution was prepared by adding 20 hg of a condensate of BDDA and formaldehyde as a crosslinking agent to 10 g of this polymer, and dissolving this in 90 g of methanol.

A condensate of BDDA and formaldehyde was prepared as follows. Add concentrated sulfuric acid 151 to BDDAIOg,
Formaldehyde Ig was added to this solution, and the mixture was incubated at 10° C. for 3 hours. After that, 100 ml of methanol was added and the precipitate was filtered for synthesis.

A color filter was prepared using the same type of glass under the same conditions as in Example 1 except that the photosensitive liquid was irradiated with light for 1 minute. The pixel film thickness of this color filter is 1.0±0.1 μm in the red pixel portion, 1.7±0.0 μm in the green pixel portion,
1μm, 2.4±0.1. in blue pixel area. It was czm.

Example 5 As a light-sensitive material, polyvinyl cinnamylidene acetate as shown in formula (5) to which erythrosine was added as a sensitizer was used. This spectral sensitivity is 400no+~
It was 600rv.

Formula (5) % Formula % This polyvinyl cinnamylidene acetate was synthesized as follows. 20 g of polyvinyl alcohol and 90 g of cinnamylidene acetic acid chloride were mixed with 30 g of methyl ethyl ketone.
01, and in this solution, 43 g of triethylamine
After the addition, the mixture was heated at 50° C. for 5 hours. After adding 300 cc of ethyl acetate, the precipitate was filtered to synthesize the compound shown in formula (1).

A color filter was prepared using this photosensitive liquid under the same conditions as in Example 1 and using the same type of glass.

The pixel thickness of this color filter is 1.0 in the red pixel part.
±0.1 μm, 1.5 ±0.1 μm in the eastern part of the recording, and 2.2 ±0.1 μm in the blue pixel area.

Comparative Example 1 The photosensitive solution was 25 g of 20% gelatin aqueous solution, 5 g of 20% ammonium dichromate aqueous solution, and 2% chromium alum.
A solution containing 1 g of an aqueous solution was used. This photosensitive solution was applied to the same type of glass as in Example 1 for 1500 r.

I made a spin code with 1da. Using the xenon lamp used in Example 1, lOOμ was applied to the glass plate coated with this photosensitive liquid.
A red pixel was created by irradiating light for 2 minutes through a mask with 1×200μ carbon holes and then immersing it in an aqueous red dye solution.

Next, apply photosensitive liquid to this glass plate at 1000 r, p, m.
After spin-coding with , and going through the process described above, it was immersed in an aqueous green dye solution to create a green pixel next to the red pixel.

Furthermore, apply photosensitive liquid to this glass plate at 500r, p, ts.
, and a blue pixel was created next to the green pixel using a blue dye aqueous solution.

The film thickness of each pixel of this color filter is shown in FIG. There is a rise between pixels, 1.0±0.2μm in the red pixel part
, 1.0±0.5μm in the eastern part of the recording, 1.3± in the blue pixel area
It was 0.6 μm.

Comparative Example 2 The same polymer as in Example 1 was used in the photosensitive material. 300n-~ as a crosslinking agent to 10g of this polymer
p-diazophenylamine with absorption at 450rv (
Formula (6)) was added for 200s+g, and this was mixed with methanol 90g.
A photosensitive solution was prepared by dissolving it in g.

Equation (6): A color filter was produced using the same type of glass under the same conditions as in Example 1 except that the photosensitive liquid was irradiated with light for 3 minutes. The pixel thickness of this color filter is
It was 1.0 μm in the red pixel part, 1.0 μm in the recording eastern part, and 1.3 μm in the blue pixel part.

Even if the light irradiation time was increased, it was not possible to create a difference in film thickness between the eastern part of the recording and the red pixel part.

Note that in the above examples, glass having red, green, and blue pixels created by patterning and dyeing dichromate gelatin was used, but a substrate having pixels created by printing, photography, etc. may also be used. . Furthermore, the substrate may be made of epoxy resin, plastic such as polycarbonate, etc. in addition to glass.

Effects of the Invention According to the manufacturing method of the present invention, by closely adhering a photosensitive material to a part or the entire surface of a plurality of pixels of different colors and controlling the spectral sensitivity of the photosensitive material, a relief of a predetermined film thickness can be produced for each pixel of each color. Good accuracy (could be easily obtained).

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the manufacturing process of a color filter according to an embodiment of the present invention, FIG. 2 is a sectional view of a conventional color filter, and FIG. 3 is a film of a color filter obtained by the present invention. Graph showing thickness measurement results. FIG. 4 is a graph showing thickness measurement results of a conventional color filter. 1...Glass substrate, 2...Pixel, 3...Photosensitive material, 4...Relief for each pixel, 5...Glass substrate, 6...Pixel, 7... ...Transparent conductive film, 8.
...Liquid crystal layer, 9...Electrode, 10...Glass substrate. Name of agent: Patent attorney Toshio Nakao and one other person
Color Tip 8-°Liquid crystal layer 9-Electrode Figure 2

Claims (8)

[Claims] (1) A photosensitive material layer with controlled spectral sensitivity is formed in close contact with a part or the entire surface of a plurality of pixels of different colors, and by exposing and developing this, a predetermined film thickness is achieved for each pixel of each color. A method for producing a color filter for a liquid crystal display, characterized by obtaining relief. (2) The method for manufacturing a color filter for a liquid crystal display according to claim 1, wherein the photosensitive material is a photocurable resin sensitive to visible light. (3) The method for producing a color filter for a liquid crystal display according to claim 1, which comprises crosslinking a photoreactant to a polymer compound of a photosensitive material to make it insolubilizable. (4) The method for producing a color filter for a liquid crystal display according to claim 3, wherein the photoreactant absorbs light of 400 nm to 600 nm. (5) Claim 3 or 4, characterized in that the photoreactant is a diazo compound or an azide compound.
A method for producing a color filter for a liquid crystal display as described in 2. (6) The method for producing a color filter for a liquid crystal display according to claim 5, wherein the diazo compound is 4,4'-bisdiazodiphenylamine or a condensate of 4,4'-bisdiazodiphenylamine and formaldehyde. . (7) The method for producing a color filter for a liquid crystal display according to claim 1, wherein the photosensitive material contains a sensitizer that is sensitive to visible light. (8) The method for producing a color filter for a liquid crystal display according to claim 1, wherein the sensitizer has absorption in a wavelength range of 500 nm to 600 nm.