JPS62141502A - Production of color filter for liquid crystal display body - Google Patents

Abstract

PURPOSE:To improve a contrast ratio by tightly adhering a silver halide salt material to parts to be formed as picture elements or the entire surface thereof and exposing and developing said material through a mask to form a black matrix at the boundaries of the parts to be formed as the picture elements. CONSTITUTION:A color filter for a display body is produced by tightly adhering the silver halide salt material 4 to parts to be formed as the picture elements 2 or the entire surface thereof then forming the black matrix 3 to the boundaries of the parts to be formed as the picture elements 2 by exposing and developing said material through the mask 5. The silver halide salt material 4 tightly adhered to parts to be formed as the picture elements 2 or the entire surface thereof is sensitized by receiving the light transmitted through the mask 5. Said material is further subjected to an ordinary developing process or reversal developing process by which the parts irradiated with the light or the parts not irradiated with the light are reduced to pulverized metallic silver particles. The pulverized particles scatter light and function as the black matrix 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a color liquid crystal display device and can be used in devices that display color images such as television/video monitors or computer terminals.

Conventional technology In a color liquid crystal display device whose components include a liquid crystal that controls the amount of light transmitted or reflected and a color filter, a black matrix is created by creating a black matrix between pixels in order to improve contrast. This black matrix was created by patterning a dyeable polymer material and then dyeing it black with dye, or by printing black ink.

Problems to be Solved by the Invention In this case, the black matrix created using black dye or black ink had a high light transmittance in the wavelength range of 400 nm to 700 nm, making it impossible to obtain sufficient contrast.

The only way to solve the problem is to adhere a silver halide salt material to part or all of the part that should become a pixel, then expose it to light through a mask and develop it to create a black matrix at the boundary of the part that should become a pixel. A color filter for a display body is manufactured.

The silver halide salt material that is in close contact with a part or the entire surface of the portion that is to become the active pixel is exposed to the light that has passed through the mask. Further, by carrying out a normal development process or a reversal development process (thus, the areas that received light or the areas that did not receive light are reduced to fine metal silver particles. These fine particles scatter light and function as a black matrix.

Example 1 A color filter was created by the process shown in FIG. A quartz glass plate 1 having a diameter of 50 m'll was coated with dichromate gelatin, and after patterning, it was colored with a dye to create red, green, and blue pixels 2. Film thickness is 1.0μm
Met.

Using this glass having red, green, and blue pixels 2, a black matrix 3 was created using the materials and method shown below. Silver salt material 4 was created from the following solutions A and B.

Solution: Potassium bromide 166g Potassium iodide 5g Gelatin 65g Water 1700g Solution B: Silver nitrate 200g Water
2000 g of liquid A was stirred vigorously while being kept at 70°C, and liquid B at 70°C was gently dropped into the liquid. This liquid was stirred at 80° C. for 3 hours, then a solution of 260 g of gelatine dissolved in 100 g of water was added, stirred for 30 minutes, and then cooled overnight. After further washing in water at 6°C for 2 hours, 100g of gelatin was added and heated to 60°C.
I stirred it for an hour. To 100 g of this emulsion, 400 mKs of chromium alum, 40 gs of silane coupling agent (Shin-Etsu Chemical Exhibition KBM602), and 2% ethanol solution of erythrosin expressed by the following formula as a sensitizer, 1
g was added to prepare silver salt material 4.

This silver salt material 4 was spin-coded at 100 Or, p, m onto the glass pixel having the red, green, and blue pixels 2 described above. After pre-baking this for 70°Cl2O, a xeno/arc lamp 5oot (trXL-
60on-0), the distance between the light source and the sample was set to 30cIII, and light was irradiated for 2 seconds through a mask 6 as shown in the figure.

This glass plate was treated with a developer having the composition shown below.

Development 1: P-methylaminophenol 4g anhydrous sodium sulfite eog hydroquinone 10g sodium carbonate 63g potassium bromide 2.6g Add water to make a total volume of 10100O Fixing solution: water 35oml ammonium thiosulfate 100g anhydrous sodium sulfite 7.5g 28% acetic acid aqueous solution 241111 Boric acid
3.75 g The irradiated glass plate was first immersed in a developer solution at 20°C for 2 minutes, then washed with water at 20°C, and then immersed in a constant temperature solution at 20°C for 2 minutes to apply Black Matrix 3. Created. A liquid crystal display device was created using this color filter, and the contrast ratio of the transmittance when no voltage was applied and when 6V was applied was measured at 400 nm to 700 nm, and it was found to be 47.
It was 2. FIG. 2 shows the relationship between applied voltage and transmittance. The thickness of the black matrix 3 was measured with a contact type step needle and was 1.8 μm.

Example 2 The same silver salt material as in Example 1 was used. This silver salt material was applied to the same material under the same conditions as in Example 1, irradiated with light for 1 second, and then tanned with a developer having the composition shown below. The tanning treatment here is as follows.

Developer B: Pyrogallol 4g Sodium hydroxide 1.5g Potassium chloride 0.75g Potassium bromide 0.76g Citric acid 0.1g Water Sooml fixer: Same composition as in Example 1. It was immersed in 20'C developer solution B for 2 minutes, then washed with 20°d water, and then immersed in 20'C fixer solution for 2 minutes. Further, unnecessary parts were washed away with hot water at 60°C to obtain a black matrix, and a color filter for display was produced. A liquid crystal display device was created using this color filter, and as in Example 1, 400 nm to 7
When the contrast ratio was measured at 00 nm, it was 60.7.
Met. Note that the color filter created in Example 2 is 400 nm to 700 nm smaller than that created in Example 1.
The transmittance at m was high. The thickness of the black matrix was 1.8 μm as measured by a contact level difference meter.

Example 3 A high-resolution plate coated with an emulsion on glass was used to create a black matrix on a transparent substrate. This high-resolution dry plate was a commercially available one (Konishi Roku Photo Industry Co., Ltd. [HRP N4 type)].

This dry plate was irradiated with light for 1 second using the same mask as in Example 1 and then tanned in the same manner as in Example 2 to obtain a black matrix. This glass plate with a black matrix was coated with dichromate gelatin, and after buttering, a red dye aqueous solution (Nippon Kayaku Kayanolphloxin NK 0.5% aqueous solution PH4) was heated at 66°C.
I created a red pixel by dipping it in Dichromate gelatin was applied in the same manner, and after patterning, a green dye aqueous solution at 66°C (Hodogaya Chemical Industry Eisen Primula Turquoise Blue GLH and Nippon Kayaku Kayakaran Yellow GL 6)
:4 mixture of O, S% aqueous solution (pH 4) to create a green pixel. Create a pattern again with gelatin, 6
A blue pixel was created by immersing it in blue dye water-soluble 7i (ICI Co., Ltd. Kumari-Brilliant Blue GO 15% water-soluble ap14) at 6°C. A liquid crystal display device was created using the color filter created in this way, and a 400 nl liquid crystal display device was created in the same manner as in Example 1.
When the contrast ratio was measured at 11 to 700 nm,
It was 61.2. The thickness of the black matrix was 1.8 μm as measured by a contact level difference meter.

Example 4 The same silver salt material as in Example 1 was used. This silver salt material was spin-coded at 70 Or, p, m on the same substrate as in Example 1, prebaked at 70'C for 20 minutes, and then irradiated with light for 2 seconds. Thereafter, tanning treatment was performed under the same conditions as in Example 2. A liquid crystal display device was prepared using this color filter, and the contrast ratio was measured at 400 nm to 700 nm in the same manner as in Example 1, and found to be 48.7.

The thickness of the black matrix was 3.2 μm as measured by a contact profilometer. The photosensitive solution of the comparative example was 25 g of a 20% aqueous gelatin solution, 5 g of a 20% aqueous solution of ammonium dichromate, A solution containing 1 g of a 2% aqueous solution of chromium alum was used. This photosensitive solution was mixed with glass K 1500 r of the same type as in Example 1,
Spin coded with p and m. The xenon lamp used in Example 1 was applied to the glass plate coated with this photosensitive liquid, and the size was 1.
After irradiating it with light for 2 minutes through a mask with a hole of ooμlll×200 μm, it was immersed in the aqueous red dye solution used in Example 3 to create a red pixel. Next, this glass plate was spin-coded with a photosensitive liquid at 100 Or, pm, and after going through the process described above, it was immersed in the green dye aqueous solution used in Example 3 to create a green pixel next to the red pixel. did. Further, a photosensitive solution was spin-coded on this glass plate using so or p, m, and a blue pixel was created next to the green pixel using the aqueous blue dye solution used in Example 3. Finally, a photosensitive solution was spin-coded on this glass plate at 500 r, p, m, and a black dye aqueous solution (Sumitomo Chemical Acid Pluak 10B 0.5%
A black matrix was created using an aqueous solution PH4). A liquid crystal display device was prepared using this color filter, and the contrast ratio was measured at 400 nm to 700 f1m in the same manner as in Example 1, and it was found to be 2o.4. FIG. 3 shows the relationship between applied voltage and transmittance. In addition, the thickness of the black matrix was measured with a contact type step meter and was 1.
It was 8 μm.

Effects of the invention As described above, a silver halide salt material is adhered to a part or the entire surface of the part to become a pixel, and then exposed to light through a mask and developed to create a black matrix at the boundary of the part to become a pixel. By doing so, we were able to improve the contrast ratio.

In the present invention, glass having red, green, and blue pixels created by patterning and dyeing dichromate gelatin was used, but the pixels may be created by printing, photography, or the like.

In addition to glass, the substrate can be made of epoxy resin, transparent plastic such as polycarbonate, or the like.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the manufacturing process of a color filter of the present invention, FIG. 2 is a diagram showing applied voltage-transmittance characteristics of a liquid crystal display device of an example, and FIG. 3 is a diagram of a conventional liquid crystal display device. FIG. 3 is a diagram showing applied voltage-transmittance characteristics. 1...Transparent substrate, 2...Pixel, 3...
...Black matrix, 4...Silver halide salt material, 6...Mask. Name of agent: Patent attorney Toshio Nakao and one other person
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Claims (4)

[Claims] (1) A silver halide salt material is adhered to a part or the entire surface of the part to become a pixel, and then exposed to light through a mask and developed to create a black matrix at the boundary of the part to become a pixel. A method for producing color filters for liquid crystal displays. (2) A method for manufacturing a color filter for a liquid crystal display according to claim 1, characterized in that a black matrix is created after forming a plurality of pixels. (3) The method for manufacturing a color filter for a liquid crystal display according to claim 1, characterized in that pixels are created after a black matrix is created on a transparent substrate. (4) The method for producing a color filter for a liquid crystal display according to claim 1, wherein the developing method of the exposed silver halide material is tanning development.