JPH08160218A - Production of color filter - Google Patents

Abstract

PURPOSE: To resolve the difficulty of alignment at the time of transferring a color filter. CONSTITUTION: In the producing method for color filter for forming the color filter on a transparent substrate 1 by transferring a color filter layer 5 formed on a transfer sheet 4 using a low expansive sheet having the same coefficient of thermal expansion as that of a material to be transferred as a base film for transfer on the transparent substrate 1, the color filter layer 5 and a light shielding layer 2 are formed on the transfer sheet 4 and are collectively transferred on the transparent substrate 1. The alignment operation is unneeded. And alignment accuracy of the color filter with a black matrix and the yield, which are problems at the time of transferring, are drastically improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a color filter incorporated in a color liquid crystal display device.

[0002]

2. Description of the Related Art In a method for manufacturing a color filter in which a color filter layer is transferred from a transfer sheet onto a transparent substrate, the difference in the coefficient of thermal expansion from the transparent substrate made of low expansion glass is reduced to improve the dimensional accuracy. Therefore, since there is a heating step in the middle of the transfer step, the present inventors have proposed using a low-expansion sheet as the base film.

When the transfer sheet and the glass substrate with a metal chrome pattern are bonded and transferred in such a manufacturing process, conventionally, as shown in FIG. 2, the color filter layers 5R (red) and 5G ( Green), 5B
Alignment mark 5A using one color (blue) and alignment mark 2 using chrome on glass substrate 1
a was microscopically aligned using reflected light.
For this reason, the chrome alignment mark 2a is reflected in white and is difficult to see, which is time-consuming and inefficient.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the difficulty of alignment at the time of transferring a color filter as described above.

[0005]

According to the present invention, a color filter layer formed on a transfer sheet using a metal sheet having a low expansion coefficient similar to the thermal expansion coefficient of a transfer object as a transfer base film, glass, etc. A method of manufacturing a color filter in which a color filter is formed on a transparent substrate by transferring to a transparent substrate, the color filter layer and the light shielding layer are formed on a transfer sheet, and these are collectively applied to the transparent substrate under heat and pressure. It is a method for producing a color filter, which is characterized by transferring.

That is, specifically, as shown in FIG.
A polyvinyl alcohol layer 6 is applied on the metal sheet 4 as a release layer, and the color filter layer 5 and the black matrix layer 2 are formed thereon. Here, the order of forming these does not matter. Transfer sheet made in this way,
Facing the transparent glass substrate 1 coated with the adhesive 3, pressure-bonding, heating, and ultraviolet irradiation to cure the adhesive 3,
The color filter substrate 5 is manufactured by collectively transferring the color filter layer 5 and the black matrix layer 2 onto the glass substrate 1.

The present invention will be described in detail below with reference to the drawings. Manufacturing a color filter that forms a color filter on a transparent substrate by transferring a color filter layer that is formed on a transfer sheet that uses a sheet of low expansion metal as a transfer base film to a transparent substrate such as glass In the method, the so-called transfer method, metals and plastics having a low coefficient of thermal expansion such as nickel-iron alloy (42 alloy), amber material, polyethylene terephthalate, and polycarbonate are used as the transfer base film. For example, 42 alloy (Ni: 42 wt%, balance Fe) has a coefficient of thermal expansion of 20 to 40 × 10 ⁻⁷ / ° C., which is similar to the coefficient of thermal expansion of the substrate glass used in the liquid crystal display device.

Conventionally, when a metal is used as the base film, the alignment is performed using reflected light. Therefore, as shown in FIG. 2, the alignment mark 2a of metallic chrome is reflected in white and hard to see, and the time required for alignment takes about 1 to 2 hours, which is inconvenient. In order to fundamentally eliminate such inconvenience at the time of transfer, in the present invention, as shown in FIG. 1, the color filter layer 5 and the black matrix layer 2 are both formed on the metal sheet 4, and these are collectively glass. It was decided to transfer it onto the substrate 1.

[0009]

According to the above method, since the color filter layer and the black matrix layer are formed in the same step, a difficult alignment operation becomes unnecessary. Therefore, misalignment at the time of transfer is eliminated, and pattern accuracy is improved.

[0010]

Example First, 6% by weight of polyvinyl alcohol was applied to a metal sheet 4 of nickel-iron alloy (42 alloy) having a thickness of 0.11 mm to a thickness of 5 to 10 μm by a dip coater method to form 150 After drying at 0 ° C., a polyvinyl alcohol layer 6 as a release layer was obtained. A red acrylic pigment-dispersed photosensitive material having the following composition was coated on the above-mentioned release layer by a reverse coater, dried, subjected to pattern exposure with active light, developed with an alkali developing solution, washed with water, and dried at 150 ° C. for 5 minutes. Similarly, green, blue and black were pattern-exposed and developed at predetermined positions to form a color filter element.

The composition of the acrylic pigment-dispersed photosensitive material is based on the following formulation. A: 10 parts by weight of pigment. All materials are indicated by color index (CI) number. Breakdown red; CI red pigment 177 green; CI green pigment 36, CI yellow pigment 139 blue; CI blue pigment 15 black; CI black pigment 7 B; anionic acrylic copolymer having the following composition
10 parts by weight Methyl methacrylate 2 parts by weight Methacrylic acid 1 part by weight Hydroxy methacrylate 2 parts by weight Butyl methacrylate 2 parts by weight Cyclohexyl acrylate 3 parts by weight C: Polyfunctional acrylic monomer (Toagosei Chemical Industry Co., Ltd.)
Made, product name "Aronix M-300")
10 parts by weight D: Photopolymerization initiator (manufactured by Ciba-Geigy, trade name "IRGAGUAR 907") 0.5 parts by weight E: Organic solvent 120 parts by weight A photopolymerizable pigment dispersion photosensitive material prepared by thoroughly mixing and mixing A to E Prepared.

On the other hand, 3 parts by weight of butyl methacrylate, manufactured by Toagosei Chemical Industry Co., Ltd., trade name "Aronix M-3"
05 "2 parts by weight, manufactured by Toagosei Kagaku Kogyo Co., Ltd., product name" Aronix M-400 "5 parts by weight, organic solvent 40 parts by weight, photopolymerization initiator (manufactured by Ciba-Geigy, product name" Irgagure 907 ") 0.2 A solution consisting of parts by weight was applied onto a washed glass substrate 1 under the trade name “7059” manufactured by Corning Incorporated, and a 2 μm adhesive layer was provided when dried.

The surface of the adhesive layer 4 and the surface of the transfer sheet formed as described above on which the colored layer is formed are opposed to each other at 150 ° C.
It was pressurized with two rolls heated to 0. After that, ultraviolet light of 100m
Both substrates were separated by irradiation with J / cm ² . As described above, the color filter layer 5 and the black matrix layer 2 were collectively transferred to the glass substrate 1.

[0014]

According to the method of the present invention, since the alignment operation is unnecessary, the time conventionally required for the alignment becomes unnecessary. In addition, the alignment accuracy between the color filter and the black matrix, which has been a problem during transfer, and the yield are dramatically improved. The following is a table comparing the conventional method with the method according to the present invention.

[0015]

[Table 1]

[0016]

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a color filter manufacturing method according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a manufacturing process of a conventional transfer type color filter.

[Explanation of symbols]

 1 Glass Substrate 2 Black Matrix Layer 2a Alignment Mark 3 Adhesive 4 Metal Sheet 5 Color Filter Layer 5A Alignment Mark 6 Polyvinyl Alcohol Layer

Claims (1)

[Claims] 1. A color filter layer formed on a transfer sheet using a low-expansion sheet having a coefficient of thermal expansion similar to that of a transfer object as a transfer base film is transferred to a transparent substrate such as glass. A method for producing a color filter in which a color filter is formed on a transparent substrate, wherein a color filter layer and a light-shielding layer are formed on a transfer sheet, and these are collectively transferred under heat and pressure onto the transparent substrate. Filter manufacturing method.