JPH0854619A - Production of color filter - Google Patents

Abstract

PURPOSE:To provide an easy method to produce a color filter having high precision without mixing of colors. CONSTITUTION:On a dielectric layer 12 formed on a light-transmitting conductive body 11, an electrostatic latent image is formed and developed with a desired color developer 16-18 to form a color layer. This procedure is repeated to form other color layers to obtain the color filter. In this method, an electrifying body 13 having a mask 14 corresponding to the image pattern on its surface is brought into contact with the dielectric layer 12 to apply voltage to produce an electrostatic latent image.

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 used for a solid-state image pickup device, a liquid crystal display device or the like.

[0002]

2. Description of the Related Art Color filters for image pickup devices, liquid crystal display devices, etc., in which light-transmitting red, blue, green and black filter portions are provided in a desired pattern on a transparent substrate such as glass. Is manufactured.

Conventionally, as a method for producing a color filter, a dyeing method or a pigment in which a dyeable photosensitive resin is applied on a transparent substrate, an image is formed through exposure and development steps, and a desired color is dyed. Apply the dispersed photosensitive resin on the transparent substrate,
Exposure, developing pigment dispersion method, printing method in which colored ink is directly applied on a transparent substrate by offset printing method, etc., after patterning a transparent conductive layer on a transparent substrate, and using an electrodeposition paint only on a desired pattern portion There is an electrodeposition method for forming a colored layer.

Among the above methods, the dyeing method has a drawback that it is difficult to control the dyeing process, and an intermediate layer is required to prevent color mixture between colors, which complicates the process. Further, in the dyeing method and the pigment dispersion method, it is difficult to uniformly apply the photosensitive resin when manufacturing a large color filter. The printing method requires advanced printing technology in order to maintain positional accuracy. Further, the electrodeposition method has a drawback that the patterning of the transparent conductive layer is complicated.

Therefore, as a more accurate and simple method for manufacturing a color filter, a method using an electrostatic recording method is known.
It is described in JP-A-3-126902 and JP-A-3-150503. In these methods, after forming a transparent conductive layer and a dielectric layer on a transparent substrate, an electrostatic latent image is formed on the dielectric layer, development is performed using a colored developer, and a colored layer is formed on the dielectric layer. To form.

As a means for forming an electrostatic latent image, a transparent conductive layer and a dielectric layer are sequentially provided on the transparent substrate, and a conductive mask having fine pores is superposed on the transparent substrate, and the fine pores are formed by corona charging. A method of charging, a method of uniformly charging the dielectric layer and then covering with a conductive mask having pores, and removing the electric charge in the portion in contact with the mask, the dielectric layer of the transparent substrate, and a conductive support There is a method of applying a DC voltage by facing a part of which is provided with an insulating layer, and the like.

[0007]

[Problems to be Solved by the Invention] In the former two methods,
Since the charging is performed by corona charging, a high voltage must be applied, and ozone is generated, which causes a problem in durability of the device and adversely affects the human body. Further, in the latter method, when the area of the desired color filter is increased, the adhesion between the transparent substrate and the conductive support having the insulating layer is not uniform, and the positional accuracy of each colored layer shifts or color mixing occurs. There was a problem that

[0008]

The inventors of the present invention have made extensive studies to solve the above-mentioned problems, and as a result, provided a dielectric layer on a light-transmissive conductor and formed an electrostatic latent image on the dielectric layer. In a method for producing a color filter in which an electrostatic latent image is developed with a desired colored developer to form a colored layer, and then another colored layer is formed through the same process, a mask corresponding to an image pattern is provided on the surface. It has been found that the electrostatic latent image may be produced by bringing a charged body into contact with the dielectric layer and applying a voltage thereto.

In the present invention, a highly accurate color filter can be manufactured by using the electrostatic recording method. Further, since the electrostatic latent image is produced by contact charging, environmental problems such as ozone generation do not occur. Further, in particular, by using a roll-shaped charged body around which a mask is wound as the charged body, it is not necessary to bring the entire surface of the dielectric layer on the transparent substrate into close contact with the mask at the same time, and high positional accuracy can be obtained. It can be manufactured.

The present invention will be described in detail below with reference to FIG. In the present invention, first, the dielectric layer 12 is provided on the light transmissive conductor 11 (FIG. 1A), and the charging body 13 is brought into contact with the dielectric layer 12 through the mask 14 (FIG. 1B), and the voltage is applied. Is applied to form an electrostatic latent image (FIG. 1C). Next, this electrostatic latent image is developed with a colored developer 15 to form a colored layer on the dielectric layer 12 (FIG. 1 (d)). At least 3 steps
By repeating this, red, blue, and green colored layers are provided to manufacture a color filter (FIG. 1E).

As the charging member according to the present invention, it is particularly preferable to wind a conductive elastic member having an electric resistance of 10 ⁶ to 10 ¹⁰ Ω · cm around a metal core rod. As the metal core rod, a metal having good conductivity such as iron, aluminum, copper or SUS can be used. As the conductive elastic body,
An elastic body containing conductive fine particles can be used. As the conductive fine particles, carbon black,
Tin oxide particles, titanium oxide particles and the like can be used. Examples of the elastic body used in the present invention include urethane, natural rubber, butyl rubber, polyisoprene rubber, polybutadiene rubber, silicone, styrene-butadiene rubber, ethylene-propylene rubber and the like. A protective layer made of nylon, urethane or the like may be provided around the elastic body. The shape of the charged body is preferably a roll shape, but various shapes such as a blade shape, a square block shape, a spherical shape, and a brush shape may be used.

As shown in FIG. 1, the charged body is covered with a mask corresponding to the image pattern so that only the necessary portion of the dielectric layer is charged. Of the developing methods described below,
When the positive development method is performed, the portion other than the colored layer is covered with an insulating mask so that the portion corresponding to the colored layer is charged. As an insulating mask, 10 ¹⁰ Ω · c
Natural rubber, synthetic rubber, plastic, paper or the like having an electric resistance of m or more can be used.

The light transmissive conductor according to the present invention includes:
A glass plate having an electric resistance of 10 ⁸ Ω · cm or less, a glass plate out of this resistance range, a plastic film such as polyethylene terephthalate (PET), or a metal such as gold, copper, nickel, palladium, aluminum or chromium, or I
It is possible to use those provided with a conductive thin film of metal oxide such as TO and tin oxide. When a plastic film is used, the surface on which the conductive thin film is not formed can be used as a dielectric layer as long as its electric resistance is 10 ¹⁰ Ω · cm or more.

As the dielectric layer according to the present invention, various resins and inorganic compounds can be used as long as they are transparent. The dielectric layer must be charge retentive in order to retain an electrostatic charge or electrostatic latent image. Therefore, it is desirable that the electric resistance is 10 ¹⁰ Ω · cm or more. Further, the dielectric layer needs to have a thickness of 0.3 mm or more in order to retain the electrostatic charge. Considering the film strength of the dielectric layer,
It is desirable to have a thickness of 0.3-5 mm. In addition, a support layer may be provided on the surface of the light transmissive conductor according to the present invention on which the dielectric layer is not formed in order to enhance the strength.

Acrylic resin, styrene-maleic anhydride copolymer, vinyl acetate resin, polycarbonate, polyethylene, polyimide, polyester, polyamide and the like can be used for the dielectric layer according to the present invention.

The electrostatic latent image obtained by contacting the dielectric layer with the charged body and applying a voltage is developed with a colored developer.
As the developing method, a positive developing method in which a charged portion is developed by using a colored developer having a charge opposite to that of the electrostatic latent image, and a non-charged by using a colored developer having a charge of the same polarity as that of the electrostatic latent image Both reversal development methods of developing parts can be used.

As the colored developer, a wet or dry electrophotographic developer can be used. Both the wet and dry color developing agents contain at least a colored and charged resin. Wet-colored developers can be used more preferably because they easily form uniform particles of this resin. The wet colored developer contains at least a solvent and a colored resin.

As a solvent for the wet type developer used when the wet type developer is used as the colored developer in the present invention, a low volatile solvent having a high resistance value is suitable, and particularly, its electric resistance value is 10 ⁹ Ω. An organic solvent having a cm or more and a dielectric constant of 3.5 or more is preferable. Examples thereof include aliphatic hydrocarbons, alicyclic hydrocarbons, halogenated hydrocarbons and the like.

In the colored resin particles in the wet developer used in the present invention, the copolymer having a hydrophilic portion and a non-philic portion with respect to the above solvent has high dispersibility, and It is preferable that the performance as a developing solution is not deteriorated even if it is recycled and reused many times.

As the hydrophilic portion, a homopolymer of the component is dissolved in a solvent, and examples thereof include higher alkyl esters of acrylic acid or methacrylic acid, linseed oil, soybean oil, safflower oil, castor oil and the like. Examples include natural resins such as vegetable oil-modified alkyd resin, rosin-modified alkyd resin, cyclized rubber, and rosin-modified phenol formaldehyde resin. As the non-amphiphilic component, on the contrary, a homopolymer of which does not dissolve in a solvent, specifically, a lower alkyl ester of acrylic acid or methacrylic acid or a substituted product thereof, acrylonitrile, styrene, acrylic acid, One or more of methacrylic acid, vinyl acetate, vinyl chloride, vinylidene chloride, vinyl alcohol, ethylene fluoride, vinyl acetal and the like can be used. Even when a dry developer is used, the resin that can be used in the above-mentioned wet developer can be used.

As the colorant used in the color developer according to the present invention, a halogen-containing pigment typified by benzidine yellow and phthalocyanine green, an azo metal salt dye and the like can be used. To color the resin, the colorant and the resin dispersion liquid are dispersed and stirred by a ball mill, a paint shaker, a dyno mill or the like. In addition to this, the color developer is developed,
A charge control agent may be contained within a range that does not adversely affect fixing and the like. Further, the charge is positive or negative depending on the charging polarity.

After development, the colored developer adhered to the dielectric layer is fixed by a method such as a heat fixing method, a light fixing method or a solvent fixing method.

[0023]

EXAMPLES The present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples without departing from the spirit of the invention.

Example 1 An ITO thin film (surface resistance 10 ⁵ Ω was formed on a 1 mm thick glass substrate.
/ Cm ² ) by a sputtering method, and a styrene-maleic anhydride copolymer (weight composition ratio 80/2
A thin film 12 (thickness 5.0 μm) having a weight average molecular weight of 22,000 was prepared. Next, as shown in FIG. 1 (b), carbon black-containing nitrile butyl rubber (electrical resistance 10 ⁸ Ω · cm, around the iron core rod 15 (diameter 1.5 cm),
A mask 14 (80 μm thick) made of insulating butyl rubber is attached to a charged body 13 having a thickness of 2 cm) and the styrene-maleic anhydride copolymer thin film 12 forming layer of the glass substrate is brought into contact with the charged body 13. , A positive electrostatic latent image corresponding to the image pattern was formed (applied voltage: 500
V). 400 parts by weight of this electrostatic latent image obtained by reacting the composition shown in Table 1 in a nitrogen atmosphere at 80 ° C. for 3 hours and a red dye (manufactured by Hodogaya Chemical Co., Ltd., Spiron Red)
After developing (positive development) with a wet developer for electrophotography (negative charging) containing 20 parts by weight of GRLH, heat fixing was performed at 70 ° C. to form a red colored layer.

[0025]

[Table 1]

Subsequently, instead of the red dye, a blue dye (manufactured by Hodogaya Chemical Co., Ltd., Spilion Blue) is used.
GRLH Special) or green dye (Hodogaya Chemical Co., Ltd., Spilion Green 3GNH)
The above process was repeated using the same electrophotographic wet developer as described above except for using (Special), and a blue colored layer and a green colored layer were sequentially formed to manufacture a color filter having a three-color structure. No defects such as color mixture were confirmed in the obtained color filter.

Example 2 On one side of a PET film (thickness 0.2 μm), Example 1 was applied.
An ITO thin film was prepared in the same manner as in. An electrostatic latent image corresponding to an image pattern was produced by using the other side of this film around the charged body 13 used in Example 1 and winding a mask 14 made of an insulating butyl rubber. Development and fixing are carried out in the same manner as in Example 1, and this process is repeated until red,
Blue and green colored layers were formed. The obtained color filter had no defects such as color mixture.

[0028]

According to the method of manufacturing a color filter of the present invention, the electrostatic recording method is used to easily achieve high accuracy.
It is possible to manufacture a color filter having no color mixture. Further, by using the contact charging method as the charging method, it is possible to safely manufacture a high-quality color filter.

[Brief description of drawings]

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

[Explanation of symbols]

 11 Light-Transmissive Conductor 12 Dielectric Layer 13 Charged Body 14 Mask 15 Core Bar 16, 17, 18 Colored Developer

Claims (2)

[Claims] 1. A dielectric layer is provided on a light-transmissive conductor, an electrostatic latent image is formed on the dielectric layer, and the electrostatic latent image is developed with a desired coloring developer to form a colored layer. In the manufacturing method of the color filter to form another colored layer through the same process,
By bringing a charged body having a mask corresponding to an image pattern on the surface into contact with the dielectric layer and applying a voltage,
A method of manufacturing a color filter, which comprises producing the electrostatic latent image. 2. The charged body comprises at least a metallic core rod and 1
2. The method for producing a color filter according to claim 1, wherein the roll-shaped charged body is composed of a conductive elastic body having an electric resistance of 0 ⁶ to 10 ¹⁰ Ω · cm.