JPS63128302A - Color filter and its production - Google Patents

Abstract

PURPOSE:To attain a display superior in image quality by packing a black coloring matter around the substrate surface area where gaps between coloring picture elements, pinhole parts of coloring picture elements, and plural coloring picture elements are provided. CONSTITUTION:Black materials are packed around the substrate surface area, where gaps between coloring picture elements 3, pinhole parts 1 of coloring picture elements, and plural coloring picture elements 3 are provided, to optically shield them from light. Black materials are packed in gaps 2 between coloring picture elements 3 for the same purpose. Carbon or the like is preliminarily dispersed in a resin and this resin is hardened or a resin is dyed with a black dye or is filmed with a metal or the like to obtain said black materials. Thus, the display superior in color purity, contrast, etc., is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color filter and a method for manufacturing the same. It relates to its manufacturing method.

[Conventional technology]

Color filters for color LCD devices are made by repeatedly forming fine colored pixels of multiple colors on a substrate made of glass, plastic, thin film transistor, etc., and then providing a protective film on top of them. The following various methods have been proposed for forming colored pixels of a filter.

(1) Photolithography method Proteins such as gelatin, gris, casein, etc. and PVA
A method in which a colored image is sequentially formed through plate making and dyeing processes using a water-soluble polymer into which a dyeing group has been introduced, and a photoreactive hardening agent such as ammonium chromate or a diazo compound.

(II) Electrodeposition method Ionized pigment is dispersed in water, voltage is applied to a transparent electrode patterned in advance, and the ionized pigment is deposited on the transparent electrode.This process is repeated one after another to form one colored pixel. How to get it.

(II+) Vapor deposition method Sublimable dyes, pigments, etc. are deposited on the substrate in a high vacuum, and colored pixels are obtained sequentially by lift-off method or etching method, or low refractive index material and high refractive index material are predetermined. A method of sequentially obtaining colored pixels by using a lift-off method or a processing method using multilayer interference thin films that are laminated in alternating thicknesses.

(!φ printing method Using pigments or dyes with good transparency.

Dispersed in a vehicle by screen printing, offset printing or flexographic intaglio printing.

A method of forming each colored pixel in sequence.

In particular, the printing method (1v) has excellent productivity and can therefore be expected to reduce costs, and is further characterized in that the physical properties of the colored pixels are robust.

Accuracy aspects such as pixel dimensions and total pitch, which were drawbacks in the past, have also been improved and are now at a level that allows them to be used as color filters.

[Problem that the invention seeks to solve]

Although the printing method has the above-mentioned advantages, it has the disadvantage that pinholes often occur in colored pixels.

For example, offset printing depends on the adhesion of the ink to the plate, blanket, printing material, or water.

Since it is established on the basis of a balance due to various physical factors such as gender, dust, unpurified components of ink, water, solvents, etc. can locally disrupt this balance and cause pinholes.

For this reason, careful attention has been paid to the ink purification method and color filter manufacturing environment, and efforts have been made to perform two or three printings to minimize the occurrence of pinholes.

In addition, in the case of color filters for color liquid crystal display elements, the purpose of improving color purity and contrast, and in the case of color liquid crystal display elements using one type of thin film transistor, is to prevent dark current caused by light from the transistor. Although it is possible to provide these black light shielding portions, there are the following problems.

First, it is necessary to prepare a plate for the black light-shielding portion in addition to a plate for the colored pixels, and there is a problem in that it is difficult to register the two in the x-y-θ directions.

There is a problem in that the aperture ratio of the color filter decreases because an overlapping area is formed between the exposed colored pixel area and the black light shielding area.

Due to the above-mentioned problems, forming a black light-shielding layer by the conventional printing method was time-consuming and did not produce sufficient effects.

Therefore, the problem to be solved by the present invention is to eliminate the drawbacks of color filters produced by conventional printing methods, and to easily manufacture a color filter in which the substrate surface area other than the colored pixels is shielded from light by a black light shielding part. An object of the present invention is to provide a color filter and a method for manufacturing the same.

[Means for solving problems]

The present invention solves the above-mentioned problems, and the first invention is, ``In a color filter in which colored pixels of a plurality of colors are sequentially and repeatedly arranged on a transparent substrate by a printing method, The second aspect of the invention is to ``print on a transparent substrate at a predetermined pitch and in a sequentially repeating manner, Colored pixels of multiple colors are formed, then a black colored negative photosensitive resin is applied to the entire surface of the transparent substrate on which the colored pixels are provided, and after being exposed to light from the side opposite to the side on which the colored pixels are provided, it is developed. A method for producing a distinctive color filter."

Next, the third invention is to form colored pixels of a plurality of colors on a transparent substrate at a predetermined pitch and in a sequentially repeated arrangement by a printing method, and then apply a dyeable negative type over the entire surface of the transparent substrate provided with the colored pixels. A method for producing a color filter, which comprises applying a photosensitive resin, exposing it to light from the side opposite to the side on which colored pixels are provided, developing it, and then dyeing the obtained photosensitive resin image black with a dye. .” is the gist.

Next, the fourth invention is to form colored pixels of a plurality of colors on a transparent substrate by a printing method at a predetermined pitch and in a sequentially repeated arrangement, and then apply a positive type over the entire surface of the transparent substrate provided with the colored pixels. After coating a photosensitive resin and exposing it to light from the side opposite to the side on which the colored pixels are provided, it is developed to form a resin image of the same shape as the colored pixel on the colored pixel. It is characterized by depositing black resin or metal in a thin film on the substrate surface, and then removing the photosensitive resin image to lift off and remove the black resin film portion or metal thin film portion on the photosensitive resin image. ``Method for manufacturing color filters.''

Hereinafter, one embodiment of the present invention will be explained in detail with reference to the drawings.

FIGS. 1(a) and 1(b) respectively show a top view and a sectional view of the first aspect of the present invention. The color filter produced by the printing method is arranged sequentially like colored pixels 3, but the pinholes (or chips) 1 leak bright, white backlight light, reducing the overall color purity. In addition, since the irregularly scattered pinholes 1 are mostly transparent, their brightness is about 3 to 5 times that of red and blue colored pixels, and about 2 to 3 times that of green pixels. Optically block light. Furthermore, the gaps 2 between the colored pixels 3 are also filled with black material for the same purpose. The black material can be obtained by pre-dispersing carbon or the like in a resin and curing it, dyeing the resin with a black dye, or coating it with a metal or the like.

The above color filter is manufactured using the following manufacturing method. You can get more.

First, the manufacturing method according to the second invention will be explained using FIG. 2 (al to C).

Colored pixels 5 are formed on a transparent substrate 6 such as glass or plastic by an offset printing method or a silk screen method.
are formed sequentially. Next, a negative photosensitive resin 7 in which black dye and pigment are dispersed is applied. The selection of the negative photosensitive resin depends on the vehicle for the colored pixels 5 obtained by the printing method, and is determined in consideration of the wettability to the colored pixels 5. That is, when the vehicle for the colored pixels 5 is oil-based, an oil-based negative photosensitive resin is also used, and when the vehicle is water-soluble, a water-soluble photosensitive resin is applied. However, even if the vehicle is a water-soluble resin, if the hydrophilic group is lost during curing due to dehydration reaction, etc., an oil-based photosensitive resin is better.

In the case of oil-based negative photosensitive resins that can satisfy the above conditions, B, Kodak KPR, KOR.

KAR-3, KMER, KMR series, Dyna
chem-1〇- DCR, Hunt Chem WAY C0AT series, Fuji Yakuhin F8R, FPBTLy 9-x',
F'VR, Tokyo Ohkasha MPPR, OMR series, o
s horse OT BR.

0NNR Nries, TPR1 Toshisha Photonice UR-
3000, Japan Synthetic Rubber Co., Ltd. CIR-771, CBR-M
Alternatively, various UV curing resins may be used. In the case of water-based, Moroya Ink Co., Ltd. MFL-8. Fuji Pharmaceutical FVR, FRi
/! J-, (Tokyo Ohkasha G-90, N0NCRO
N, Nolant NPR-29, Ueno Chemical Co. C0M8I
There are 8T etc. This photosensitive resin is used to form a ξ゛τ optical layer. Therefore, it does not necessarily have to be colorless and transparent.
Selected based on adhesion, sensitivity, resolution, etc.

The black material is dissolved or uniformly dispersed in the photosensitive resin. In the pigment system, carbon black (C01,
77265), acetylene plastic.

(C, 1,77266), lamp black (C9I).

77266), bone black (C0I, '17267)
).

Graphite (c, 1.77265), iron black (C, I, 774
99).

Anijinpura, Ri (C, I, 50440), N7=/
For black and dye-based dyes, any black coloring dye may be used when used uniformly dispersed like pigments, and when used by dissolving it in a water-soluble photosensitive resin, a direct dye is used.
,I, Direct Black17(C,I, 2
7700), C, I, Dlreet Black
19 (C.

1.35255), C, I, Diract Bla
ck 22 (C0I.

35435), C, ■, Direct Black
32 (C6I.

35440), C, I, Direct Black
38(C0I, 30235) = C, I, Dire
ct Black (C, I, 27720), C,
I, DirectBlack 56 (C, 1,341
70), C, 1, Direct Black 71 (
(,I, 25040),C,1,Direct B
Lack 74 (C8I.

34180), C, I, Direct Black
75 (C, I, 35870).

C,I, Direct Black 77 (C,I
, 35860) etc.

Oil-based photosensitive resins include oil-soluble dyes, specifically C6I,
5olvent Black3 (C, I, 261
50), C, I.

8o1vent Black5 (C, I, 5Q41
5), C01,5olventBIack7 (C,
I, 50415), C01, Ac1d Black
123 (Solvent Black) (C, 1, 12
195) etc. are used.

These black materials need to be carefully selected to ensure whether they react with the photosensitive resin, sufficient sensitivity and resolution, adhesion to the substrate, and coatability.

Moreover, the black material does not have to be black alone, but can also be obtained by a mixture of red, blue, and green materials, for example.

Perform irradiation. At this time, if the amount of exposure is too high, the colored pixel 5
Determining the optimum exposure amount is important because the upper part of the image will also be exposed. This exposure has the advantage that it is the easiest method to expose the photosensitive resin portions between and around the colored pixels.

The above is a description of the manufacturing method according to the second invention.

Next, regarding the manufacturing method according to the third invention, FIG.
This will be explained using el.

Colored pixels 8 are sequentially formed on a transparent substrate 9 made of glass, plastic, or linic by an offset printing method or a silk screen method.

Next, a negative photosensitive resin 10 having dyeability is applied. The selection of the negative photosensitive resin varies depending on the vehicle for the colored pixels 8 obtained by the printing method, and is determined by taking into consideration the wettability of the colored pixels 8. That is, when the vehicle for the colored pixels 8 is oil-based, an oil-based negative photosensitive resin is also used, and when the vehicle is water-soluble, a water-soluble photosensitive resin is applied. However, even if the vehicle is a water-soluble resin, the hydrophilic groups are lost during curing due to dehydration reactions, etc., so it is better to use an oil-based photosensitive resin. As a negative photosensitive resin with dyeing properties, if it is oil-based, Japan Synthetic Rubber Co., Ltd. JDR series is used, and if it is water-based, animal proteins such as gelatin, gryu, casein, polyvinyl alcohol, polyvinylpyrrolidone, etc. are used. Water-soluble synthetic resins such as those imparted with photosensitivity by adding dichromates, chromates, diazo compounds, etc. are used.

This type of dyeable photosensitive resin is applied by spin coating or roller coating, and then heated to remove the solvent and dry and harden.
Figure 3(b)). Next, as shown in FIG. 3(C), appropriate ultraviolet light 11 is irradiated from the back side of the pattern for exposure. By this exposure, the colored pixels, the photosensitive resin portions around the colored pixels, and the photosensitive resin portions corresponding to the pinholes of the colored pixels are exposed to light. Development is carried out using water, hot water or fishing to obtain a pattern 10 as shown in FIG. 3(d).

After the pattern 10 is sufficiently cured by heating, it is dyed with a dye. As the dye, an acid dye is used for the dyeable photosensitive resin, and the dye is several to 10 W, t, %.
Dyeing is carried out using a dye solution composed of a dye, several w, t, and h of a pH adjuster, and water at a solution temperature of 40 to 90° C. to obtain a light-shielding layer 11. As acidic dyes, C, 1, A
c1d Black 1 (C, 1, 20470), C
,1,Ac1d Black 2(C,1,50420
).

C,1,Ac1d Black 7 (C,1,263
00), c, 1. Aeid Black24 (C,
1,26370), C,1,Ac1d Black
26 (C, I.

27070), C, 1, Ac1d Black 31
(C, 1, 17580).

C,1,Ac1d Black 48 (C,1,65
005), C,1, Ac1d Bla-ck 51(
C, 1, 16711), C, 1, Aeid Black
k 52 (C, I.

15711), C, 1, Ac1d Black 94
(C, 1, 30336), etc. are used, and ammonium acetate, ammonium sulfate, acetic acid, formic acid, sulfuric acid, etc. are used as the pH adjusting agent.

In this way, the color filter of the present invention can be obtained as shown in FIG. 3(e). Although this manufacturing method, L-adic, is more complicated than the manufacturing method of the second invention, it also includes a dyeing step, but because it exposes a transparent photosensitive resin,
It has the advantage of requiring a short exposure time and providing a high optical density.

The above is a description of the manufacturing method according to the third invention.

Next, a manufacturing method according to the fourth invention will be explained using FIGS. 4(a) to 4(f).

Colored pixels 1 are printed on a transparent substrate 13 such as glass or plastic by an offset printing method or an optical screen method.
2 are sequentially formed (FIG. 4(a)). Next, a positive photosensitive resin 14 is applied. The coating method is spin coating or roller coating, followed by removal of the solvent by heating and drying and curing (FIG. 4(b)). As the positive photosensitive resin, a novolac type photosensitive resin is used, for example, Tokyo Ohka Co., Ltd.
FPR series, Fuji Pharmaceutical Co., Ltd. FPPR C series, F
HPR series, Npprei Microposite series, Hoechst Corporation 2 Nries 9 Japan Synthetic Rubber Co., Ltd. PFR-
3003, Hunt Chemical Company WAY C0AT-HPR
, WAY COAT-MPR or other appropriate ultraviolet light 15 is irradiated to perform exposure. By this exposure, the photosensitive resin portions between and around the colored pixels and the photosensitive resin portions corresponding to the pinholes of the colored pixels are exposed to light. Development is carried out by dipping or spraying using a predetermined dedicated developer to obtain a pattern as shown in FIG. 4(d).

A light shielding layer 16 is provided on these patterns as shown in FIG. 4(e). This light-shielding layer 16 can be made of a resin (vehicle) with a black material dispersed therein, or a metal thin film with a high optical density even though it is a thin film.

Finally, as shown in FIG. 4(f), the light shielding layer 16 on the pixel is lifted off by immersing it in a solvent or alkaline solution and peeling off the positive photosensitive resin.

The color filter obtained in this manner has the advantage that the optical density of the light-shielding layer can be increased.

〔Example〕

Example 1 Corning 5" 7059 material (plate thickness 1.xmt) After ultrasonic cleaning using Wako Pure Chemical's RB8 cleaning solution,
After washing with water and drying, colored pixels were obtained by offset printing.

The plate used for printing was a waterless flat plate made by Toshisha, and a mosaic pattern was printed on the original plate by exposure and developed using the company's exclusive developer @TWL-650.

This was attached to a Kouyousha Ector printing machine (offset proofing machine), printed using red ink, and thermally cured. With respect to this red ink, one plate was shifted by a predetermined pitch, and green ink was used and thermally cured. Further, colored pixels were formed in the same manner using blue ink to obtain colored pixels in which red, green, and blue were regularly arranged. Table 1 shows the composition of each ink.

Table 1 Ink composition Preparation of light-shielding parts, etc. A black colored negative photosensitive resin prepared by dispersing 5W, t, Chi Daido Kasei Diamond Black (C, 1,50440) in Tokyo Ohka Co., Ltd. OMR-8530cp was applied to the colored pixels. The coating was applied by rotation to a film thickness of 0.5 μm, and prebaked at 90° C. for 30 minutes in a clean open environment.

Next, only ultraviolet light from a 2 hw mercury lamp was irradiated from the back side of the patterned surface of one colored pixel for 60 seconds through a Toshiba@300-400 nm transmission type color physicator, and after spray development for 1 minute with a special developer, the pattern was rinsed with a special rinse. After rinsing with liquid for 15 seconds, post-baking was performed in a clean open condition at 150° C. for 30 minutes.

Finally, Torangecone resin FHL240
6 was spin-coated to a film thickness of 1 tin and thermally cured at 150° C. for 30 minutes in a clean open environment to obtain a desired color filter.

The color filter thus obtained had extremely excellent characteristics, with no pinholes and a flatness of 0.2 μm in the range.

Example 2 Creation of colored pixels Colored pixels were formed in the same manner as in VC Example 1 using Corning Co., Ltd. 5" 7059 material (thickness: 1.1 mt).

Preparation of light-shielding parts, etc. JDR-98 from Japan Synthetic Rubber Co., Ltd. was spin-coated to a 0.5 μm trap, and prebaked in clean open at 120° C. for 30 minutes.

Next, only ultraviolet light from a 2kW mercury lamp was irradiated from the back side of the colored pixel pattern surface for 30 seconds through a Toshiba 300-40011m transmission type color filter, developed by immersion in room temperature water for 1 minute, and then cleaned at 180°C for 30 minutes. We did an open post-beta.

Further, the colored pixel patterned substrate was immersed for 10 minutes in a dye bath containing 3% Nippon Kayaku black acid dye Kayanol Milling Black VLG and 3 wt% acetic acid at a temperature of 40°C to carry out dyeing. It was dried in a clean oven for 30 minutes.

Finally, Thorenricorn mBWsTL24
06 was spin-coated to a film thickness of 1 ttm and thermally cured at 150'C for 30 minutes in a clean open environment to obtain a desired color filter.

The color filter obtained in this way.

There are no pinholes and the flatness is 0.2μ in the range.
A product with extremely excellent characteristics was obtained.

Example 3 Creation of colored pixels Corning Co. 5'. Colored pixels were formed in the same manner as in Example 1 on 7059 material (plate thickness 1.1 shoulder t).

Preparation of light-shielding parts, etc. Hoechst AZ-1350 was spin-coated to a thickness of 1.5 μm, and prebaked at 90° C. for 30 minutes in a clean open environment. Next, Toshiba 300-400 nff1
Through a transmission type color filter, only ultraviolet light from a 2 kW mercury lamp was applied to the back side of the colored pixel pattern surface, and the sample was rinsed with water and air-dried.

This is followed by PerkinElmer's Landex 2 device.
At 400, chromium oxide was applied by 500 people. Furthermore, the substrate was immersed in acetone, and a Planson ultrasonic cleaner (27
Ultrasonic waves were applied at a frequency of 150 W (kHz, 150 W) to lift-on the chromium oxide.

Finally, Toray Silicone Silicone Tree 1] 18R24
06 was spin-coated to a film thickness of 11rlrL, and thermally cured at 150°C for 30 minutes in a clean open environment to obtain a desired color filter.

The color filter thus obtained had no pinholes, the density of the light shielding area was 3 or more, and had excellent characteristics.

〔Effect of the invention〕

Since the color filter of the present invention is shielded by the black light-shielding part, it is possible to display images with excellent image quality, and since the substrate area other than the colored pixels is shielded by the black light-shielding part, color purity, contrast, etc. can be improved. It is possible to display excellent results.

Furthermore, since it has excellent flatness, it is possible to create a display cell that has no variation in the distance between electrodes and therefore provides uniform display.

Further, according to the manufacturing method of the present invention, it is possible to obtain a color filter with excellent image quality due to no pinholes, no decrease in aperture ratio due to light shielding parts, and good flatness characteristics through a simple process. I can do it.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are a top view and a sectional view of a color filter of the present invention, FIGS. 2(al to d) are sectional views showing the manufacturing process of the manufacturing method of the second invention, Figures (al to C) are sectional views showing the manufacturing process of the manufacturing method of the third invention, and Figures 4(a) to fJ are sectional views showing the manufacturing process of the manufacturing method of the fourth invention.

Claims (4)

[Claims] (1) Colored pixels of multiple colors are printed on a transparent substrate using a printing method.
In the provided color filter, a black colored material is filled in gaps between colored pixels, pinhole portions of colored pixels, and a substrate surface area around a substrate surface area where a plurality of colored pixels are provided in a sequentially repeated arrangement. A color filter. (2) Colored pixels of multiple colors are formed on a transparent substrate at a predetermined pitch and in a sequentially repeated arrangement by a printing method, and then a black colored negative photosensitive resin is applied to the entire surface of the transparent substrate on which the colored pixels are provided. . A method for manufacturing a color filter, which comprises exposing and developing from the side opposite to the side on which colored pixels are provided. (3) Colored pixels of multiple colors are formed on a transparent substrate at a predetermined pitch and in a sequentially repeated arrangement by a printing method, and then a dyeable negative photosensitive resin is applied to the entire surface of the transparent substrate on which the colored pixels are provided. A method for producing a color filter, which comprises exposing and developing the image from the side opposite to the side on which the colored pixels are provided, and then dyeing the obtained photosensitive resin image black with a dye. (4) Colored pixels of multiple colors are formed on a transparent substrate by a printing method at a predetermined pitch and in a sequentially repeated arrangement, and then a positive photosensitive resin is applied to the entire surface of the transparent substrate on which the colored pixels are provided. After exposure from the side opposite to the side on which the colored pixels are provided, a resin image having the same shape as the colored pixel is formed on the colored pixel by developing, and then a black resin is applied to the transparent substrate surface on which the colored pixel and the resin image are provided. Alternatively, a method for manufacturing a color filter characterized by depositing metal in a thin film form and then removing the photosensitive resin image to lift off and remove the black resin film portion or the metal thin film portion on the photosensitive resin image. .