JPH02144501A - Production of color filter - Google Patents

Abstract

PURPOSE:To easily produce a color filter by a shyster electrolysis method by previously providing an insulating film or high-resistance film to a part of non-selected electrodes. CONSTITUTION:Electrolysis is executed by selectively conducting specific electrode patterns and the insulating film or high-resistance film is previously formed on the non-selected electrode 47. The electrodes 41 are insulated by an aniline polymerized film 47 if the electrochemically polymerized film of the aniline having he high electric resistance is formed only in the region 47 of the electrodes 41 to 7,000Angstrom film thickness and the electrolysis is executed by immersing the electrodes into an aq. colloidal soln. The red dyestuff film is eventually selectively formed only on the electrodes 42. The desired dyestuff film is selectively formed only on the desired electrode without allowing the fresh another dyestuff film to be formed on the dyestuff film having the conductivity in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a method for manufacturing a color filter used in a liquid crystal color display.

[Conventional technology 1 Insoluble in water or! i! The Sissel electrolysis method, in which soluble dye particles are surrounded by a positively charged surfactant through electrolysis to form a Sissel colloid, and a thin film of dye particles is formed on the anode electric fence by destroying the Sissel through electrolytic oxidation, was developed by Saji et al. It has been reported (j, Am, C,
hem, Sac,, 109,588N198711
, Chera, Lett, 89H19881, etc.) This is a new wet film formation method, and we have confirmed that a wide variety of dye thin films can be formed using this film formation method (
Patent application 1987-108726, patent application 1987-174102
).

Therefore, we devised a completely new manufacturing method for color filters used in liquid crystal displays by applying the original π-opening method (patent application No. 63).
-175610).

(Problem to be Solved by the Invention 1) However, the following problems have been encountered in the application to color filters as described above.

In other words, color filters usually have two or three colors (
It is often purchased based on the colored layer of 3 primary colors, but here is one example ^
When assuming a four-color striped pattern, if two colors are used, a transparent electrode pattern (IT
(O, etc.) is formed on a transparent substrate, first, only the 11 electrode patterns are electrically connected at once, and then immersed in an electrolytic solution to perform electrolysis to form a desired colored layer. Subsequently, the 12 electrodes are electrically connected all at once, and the electrodes are immersed in an electrolytic solution to perform electrolysis to form a desired colored layer.

However, when forming a three-color colored pattern, for example, a striped electrode pattern as shown in FIG. 2 is formed, and colored layers of red (R), edge (G), and blue (B) are formed. When trying to form alternately.

For example, electrode 21 in FIG. 2 is selectively made conductive.

In order to create a state in which the electrodes 22 and 23 are not electrically conductive, 'r4. It becomes necessary to use an electrode device or the like in which a pole is formed.

However, the formation pitch of the transparent electrode pattern is 0.
．． When it comes to extremely narrow pitches of 5 mm or less, it becomes difficult to create precise electrode devices that can selectively conduct electricity at such pitches, and to perform positioning to select only the predetermined electrodes. This will be an extremely difficult task.

On the other hand, form an electrode pattern as shown in Figure 3.
Only the parts shown by the dotted line 33 are connected by a conductive material, selectively decomposed, a colored layer 35 is formed, and the electrode is coated, and then the dotted line shown by 34 in FIG. Even when the parts are connected with conductive material and electrolysis is performed, the dye film produced by Sissel electrolysis remains active (even after heat treatment, etc.).
Because conductivity maintains pressure, even if you try to selectively obtain a colored layer only on electrode 32, a new colored layer will be formed on the already formed colored layer on electrode 31. occurs.

Therefore, when selectively connecting and conducting the 32 electrodes, a method can be considered in which a film with high insulation properties is provided on the 31 electrodes and the film is electrolytically formed only on the 32 electrodes. This is 33
The same holds true when forming a film by selectively connecting the electrodes.

At this time, a method of forming an insulating film using photolithography or etching may be considered, but this increases the number of steps and costs, making it impossible to take advantage of the characteristics of the Sicell electrolysis method, which is originally a low-cost method of film formation. The problem arises that the

The present invention is intended to solve these problems, and its primary purpose is to selectively conduct electrolysis through specific electrode patterns when manufacturing color filters using the Sissel electrolysis method. In order to do this, by providing insulating IIQ or high-resistance films on some of the non-selected electrodes in advance using a simple method, it is possible to manufacture color filters using the Sissel electrolysis method consisting of color patterns of three or more colors. Methods for Solving the Problems II', 71 The method for manufacturing the color filter of the present invention is to provide a method for producing a color filter of the present invention by using pigment particles that are insoluble in water or difficult to wash, and a surfactant that is charged by electrolysis. and a supporting electrolyte as the basic components, prepare a Sicell colloid aqueous solution of the dye in which the dye particles are surrounded by the surfactant, and destroy this Sicell by electrolysis to precipitate the dye particles on the conductor to form a single dye thin film. In a color filter manufacturing method using Sissel electrolysis, when electrolysis is performed by selectively conducting a specific electrode pattern, an insulating film or a high-resistance film is formed on a part of the non-selected electrodes. It is characterized by 1-ru.

As a method for forming an insulating film or a high resistance film, a printing method is preferable as a low-cost method, but a method using an electrochemical polymerization method is more desirable.

[Execution 49+11 A transparent substrate of 5 inches diagonally as shown in FIG. 4, which was formed into a transparent strip pattern of iTo (indium soot oxide), was used.

First, an aqueous dye colloid solution having the following composition was prepared at 10100O for the purpose of forming a blue-purple colored layer 1'.

・Dye monochlorosteel phthalocyanine 10mM ・Surfactant charged by electrolysis Ferrocenyl PEG (manufactured by Doguchi Kagaku) 3mM ・Supporting electrolyte LiBr O, 05M In this dye colloid aqueous solution, all 41 electrodes in Fig. 4 were connected to the 44 dotted lines. The above-mentioned transparent substrate, which was selectively conductive at certain points with carbon paste, was immersed. The immersed area is 4 in Figure 4.
The area is shown in 5. This was used as an anode, a stainless steel substrate was immersed as a cathode, and electrolysis was performed for 30 minutes at a constant voltage of 0.9V.

By this operation, a bluish-purple color film of monochlorosteel phthalocyanine was formed on the striped pattern electrode 41 (the area immersed in the liquid) in FIG. 4 to a thickness of 8000 mm. After washing this substrate with water, it was baked at 180° C. for 30 minutes to improve the adhesion of the dye film.

Next, an aqueous solution having the following composition was prepared, and the substrate on which the blue-violet dye film was formed was similarly made selectively conductive at the position 44, and immersed up to the region 46 to form a saturated calomel electrode +0.
, 7 ■ for 10 min.

Electrolyte composition Aniline 0.1MMg (ClO
2) z 0.05M As a result, in all 41 electrodes, an electrochemically polymerized film of aniline with a high electrical resistance was formed only in 47 regions to a thickness of 7000 μm. At this time, no aniline polymer film was formed on the conductive blue-purple monochlorosteel phthalocyanine.

This is because the surface potential of the monochlorosteel phthalomyanine film does not reach the polymerization potential of aniline due to potential drop.

Next, this substrate was once washed with water and then dried at 120° C. for 15 minutes.

Subsequently, the area indicated by the dotted line 48 in FIG. 4 on the above substrate was made electrically conductive using carbon paste.

Subsequently, the area No. 45 was immersed in a dye colloid aqueous solution having the composition shown below, and electrolyzed under the same conditions as the above-mentioned license 5 colloid aqueous solution.

・Dye dianthraquinonyl red 8mM ・Surfactant charged by electrolysis Ferrocenyl PEG (manufactured by Doguchi Kagaku) 3mM ・Supporting electrolyte LiBr 0.05M At this time,
The red film of dianthraquinonyl red was formed by
No. 42 electrode-I was present, and no red crotch of dianthraquinonyl red was formed on the bluish-purple dye film formed on electrode No. 41.

That is, at this time, the part of the electrode No. 41 where the carbon paste was applied was on the aniline polymer film, and the electrode No. 41 was insulated from the aniline polymer film, and the red dye film was selectively applied only to the electrode No. 42. This means that it was formed.

The first two substrates were pk-filled at 180° C. for 30 minutes in order to improve the adhesion of the red dye nQ.

Next, only the electrode indicated by 43 was made conductive at the dotted line indicated by 49, and electrolysis was carried out in an aqueous dye colloid solution having the following composition. The electrolytic conditions were the same as those for forming the dye film described above.

・Dye brominated chlorinated copper phthalocyanine 8 mM ・Surfactant charged by electrolysis Ferrocenyl PEG (manufactured by Doguchi Chemical Co., Ltd.) 3mM Supporting electrolyte LiBr 0.05M Through this electrolysis, a green dye 11i8500 was deposited on 43 electrodes. It was done.

Through the above operations, a Sissel electrolytic color filter consisting of the three primary colors of blue, red, and green was produced.

The dye, surfactant, supporting electrolyte, and film forming conditions for the dye film used are not limited to those in the examples. The anti-film is not limited to the materials and film-forming conditions of the examples, and materials include dimethylaniline, diethylaniline, virol, dimethylphenol,
Diethylphenol is also effective.

[Effects of the Invention 1 As described above, the present invention enables the production of color filters using the Sissel electrolysis method, easily and selectively without forming a new and different dye film on conductive dyes. The present invention, in which a desired dye film can be formed only on a desired electrode, is considered to be a scientifically effective method from the viewpoint of simplicity and low cost.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a transparent electrode pattern when manufacturing a two-color color filter using the Sissel electrolysis method. FIG. 2 is a diagram showing an example of a pattern of transparent electrodes when manufacturing three-color color filters using the Sissel electrolysis method. FIG. 3 is a diagram showing an example of a pattern of transparent electrodes when manufacturing three-color color filters using the Sissel electrolysis method. FIG. 4 is a diagram showing a pattern of transparent electrodes used in an example of the present invention. l l ・ 12 ・ 2 l ・ 3 l ・ 32 ・ 33 ・ 34 ・ 35 ・ 36 ・ 4 l ・ 42 ・ 43 ・ 44 ・ 45 ・ 46 ・ Transparent electrode Transparent electrode Transparent electrode Transparent electrode Transparent electrode Points of electrical continuity Dye film (U line part) formed at the point where electrical conduction is established Transparent electrode Transparent electrode Transparent electrode Transparent electrode Point where electrical conduction is established Dye colloid water; Area 47 immersed in electrolyte to form... electrochemical polymerization film formation! lf2. Shita territory +v
48...Places that have electrical continuity 49...Places that have electrical continuity Applicant Seiko Epson Co., Ltd. (company agent, patent attorney Kisanbe Meiki (and 1 other person)) 2 -
Ichisen 2141

Claims (1)

[Scope of Claims] 1) The basic components are pigment particles that are insoluble or poorly soluble in water, a surfactant that is charged by electrolysis, and a supporting electrolyte,
A color using the Shissel electrolysis method, in which a Shissel colloid aqueous solution of the dye in which the pigment particles are surrounded by the surfactant is prepared, and the Shissel is destroyed by electrolysis, and the pigment particles are deposited on the conductor to form a thin pigment film. In the filter manufacturing method, when electrolysis is performed by selectively conducting specific electrodes,
A method for manufacturing a color filter, characterized in that an insulating film or a high resistance film is formed on a portion of unselected electrodes in advance. 2) The method for manufacturing a color filter according to claim 1, wherein an electrochemical polymerization method is used to form the insulating film or the high-resistance film.