JP2764962B2 - Manufacturing method of color filter - Google Patents

Description

The present invention relates to a method for producing a color filter used for a liquid crystal color display.

[Conventional technology]

A micellar electrolysis method in which dye particles insoluble or hardly soluble in water are surrounded by a surfactant that is positively charged by electrolysis, micelle colloid is formed, and micelles are destroyed by electrolytic oxidation to form a thin film of dye particles on the anode electrode. Has been reported by Saji et al. (J.Am.Chem.Soc., 109 ,
5881 (1987)), Chem. Lett. 893 (1988), etc.) We have confirmed that it is possible to form a wide variety of dye thin films in this film formation method (Japanese Patent Application No. 63-1988).
108726, Japanese Patent Application No. 63-174102).

Therefore, by applying this method, we devised a completely new manufacturing method for color filters used in liquid crystal displays (Japanese Patent Application No. Sho 63).
−175610).

[Problems to be solved by the invention]

However, in the application development to the color filter as described above, there are the following problems.

That is, the normal color filter is often composed of colored layers of two colors or three colors (three primary colors). For example, assuming a striped colored pattern, two colors are shown in FIG. Transparent electrode pattern (IT
O, etc.) on a transparent substrate. First, only the eleven electrode patterns are energized at once, immersed in an electrolytic solution, and electrolyzed.
A desired colored layer is formed. Subsequently, the twelve electrodes may be collectively turned on, immersed in an electrolytic solution, and electrolyzed to form a desired colored layer.

However, when forming a three-colored pattern,
For example, when a stripe electrode pattern as shown in FIG. 2 is formed, and red (R), green (G), and blue (B) coloring layers are to be alternately formed, for example, as shown in FIG. To create a state in which the electrodes are selectively turned on and the electrodes 22 and 23 are not turned on, an electrode device or the like having electrodes that are in contact at a fixed pitch and that can select only the electrode 21 must be used. Disappears.

However, the formation pitch of the transparent electrode pattern is 0.
When the pitch becomes extremely narrow, 5 mm or less, it is not possible to create a precise electrode device etc. that can selectively conduct at such a pitch, and to perform positioning for selecting only a predetermined electrode. It becomes a very difficult task.

On the other hand, an electrode pattern as shown in FIG. 3 is formed, and only the 31 electrode is connected by a conductive material at a dotted line portion indicated by 33, selectively electrolyzed, and a colored layer 35 is formed. In the case of coating, and then connecting the portion indicated by the dotted line indicated by 34 in FIG. 3 with a conductive material and performing electrolysis, the dye film formed by micellar electrolysis is active (even if heat treatment is performed). Due to the presence of conductivity, even if an attempt is made to selectively obtain a colored layer only on the 32 electrodes, a new colored layer is formed on the already formed colored layer on the 31 electrode. Occurs.

Therefore, when the 32 electrodes are selectively connected to conduct electricity, a method of providing a highly insulating film on the 31 electrode and performing electrolytic film formation only on the 32 electrode can be considered. This is the same when the film is formed by selectively connecting the 33 electrodes.

At this time, a method of providing an insulating film by using a photolithography method is conceivable, but the number of steps is increased and the cost is increased, so that the characteristics of the micellar electrolytic method, which is originally a low-cost film formation, cannot be utilized. Problems arise.

Therefore, the present invention is to solve such a problem, and an object of the present invention is to provide a method for easily manufacturing a color filter by a micelle electrolytic method.

[Means for solving the problem]

The method for producing a color filter of the present invention comprises the steps of: preparing a micelle aqueous solution comprising, as basic components, water-insoluble or hardly-soluble pigment particles, a surfactant charged by electrolysis, and a supporting electrolyte.
A substrate provided with a plurality of electrodes having different electrode end positions corresponding to the color layer to be formed is immersed in a substrate provided with a plurality of electrodes, and the micelle aqueous solution is electrolyzed to selectively immerse the electrodes. What is claimed is: 1. A method of manufacturing a color filter for depositing dye particles of a plurality of colors on an electrode, comprising: selecting an electrode for forming a first colored layer from the plurality of electrodes; A step of electrically conducting; and a step of immersing the substrate in a first micelle aqueous solution in a state where one end of the electrode is exposed, and depositing pigment particles on the electrode by electrolysis to form a first colored layer. And immersing the substrate in an electrolytic solution while exposing one end of the electrode on which the first colored layer is formed, and electrolyzing the first substrate.
Forming an insulating film or a high resistance film in a region adjacent to the colored layer, selecting an electrode for forming a second colored layer from the plurality of electrodes, and forming an electrode at each of the selected electrode ends. Electrically conducting across the insulating film or the high resistance film; and immersing the substrate in a second micelle aqueous solution in a state where one end of the electrode is exposed, and dyeing the pigment particles on the electrode by electrolysis. Depositing to form a second colored layer.

Further, an electrode forming a first colored layer is selected from the plurality of electrodes, and a first colored layer is formed on a region excluding one end of each of the selected electrodes. An insulating film or a high-resistance film is partially formed by an electrochemical polymerization method.

As a method of forming the insulating film or the high-resistance film, a printing method or the like is preferable as a low-cost method, but a more preferable method is an electrochemical polymerization method.

〔Example〕

A transparent substrate having a diagonal of 5 inches as shown in FIG. 4 in which a transparent electrode of ITO (indium tin oxide) was formed on a stripe pattern was used.

First, 1000 ml of a dye colloid aqueous solution having the following composition was prepared for the purpose of forming a blue-violet colored layer.

・ Dye monochloro copper phthalocyanine 10mM ・ Electrochemically charged surfactant ferrocenyl PEG (manufactured by Dojindo Chemical) 3mM ・ Supporting electrolyte LiBr 0.05M In this dye colloid aqueous solution, all 41 electrodes in Fig. 4 are shown at 44 dotted lines. The transparent substrate selectively conductive with carbon paste was immersed. The immersed area was the area indicated by 45 in FIG. This was used as an anode, and a stainless steel substrate was immersed as a cathode, and electrolysis was performed at a fixed pressure of 0.9 V for 30 minutes.

By this operation, a blue-violet monochloro copper phthalocyanine film having a film thickness of 8000 mm was formed on the stripe pattern electrode 41 (the region immersed in the liquid) in FIG. After washing with water, the substrate 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 above-mentioned blue-violet dye film was formed was similarly selectively conducted at the position of 44, immersed in the region of 46, and with respect to the saturated calomel electrode +0.
The cells were subjected to constant potential electrolysis at 7 V for 10 minutes.

Electrolyte composition aniline 0.1M Mg (ClO ₄ ) ₂ 0.05M As a result, in all of the 41 electrodes, only in the region of 47, an electrochemical polymerized aniline film with high electrical resistance was 7000
It was formed with a film thickness of Å. At this time, no polymerized aniline film was formed on the conductive blue-violet monochloro copper phthalocyanine. This is because the surface potential of the monochlorocopper phthalocyanine film does not reach the polymerization potential of aniline due to the potential drop.

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

Subsequently, the region indicated by the dotted line indicated by 48 in FIG. 4 was electrically connected to the substrate with a carbon paste.

Subsequently, up to the 45th region was immersed in an aqueous solution of dye colloid having the following composition, and electrolysis was carried out under the same conditions as those for the aqueous solution of dye colloid described above.

・ Dianthraquinonyl red 8mM ・ Electrochemically charged surfactant ferrocenyl PEG (manufactured by Dojindo) 3mM ・ Supporting electrolyte LiBr 0.05M At this time, the red film of dianthraquinonyl red was formed by 42 The red film of diansuraquinonyl red was not formed on the blue-violet dye film formed on the electrode of No. 41 only.

That is, at this time, the portion where the carbon paste was applied on the electrode 41 was on the aniline polymer film, the electrode 41 was insulated by the aniline polymer film, and the red dye film was selectively formed only on the electrode 42. It means that it was done.

The substrate was heated and baked at 180 ° C. for 30 minutes in order to improve the adhesion of the red dye film.

Next, only the electrode indicated by 43 was electrically connected at the portion indicated by the dotted line indicated by 49, and electrolysis was performed in an aqueous dye colloid solution having the following composition.
The electrolysis conditions were the same as those for forming the dye film.

・ Dye Brominated chlorinated copper phthalocyanine 8mM ・ Electrolytically charged surfactant ferrocenyl PEG (manufactured by Dojindo Chemical) 3mM ・ Supporting electrolyte LiBr 0.05M By this electrolysis, 8500Å of a green dye film was obtained on 43 electrodes.

By the above operation, a micelle electrolytic color filter consisting of three primary colors of blue, red and green was obtained.

The conditions for forming the dye, surfactant, supporting electrolyte, and dye film used are not limited as in Examples, and furthermore, an insulating film or a high-resistance film formed by an electrochemical polymerization method. Are not limited to the materials and film forming conditions of the examples, and the materials include dimethylaniline,
Diethylaniline, pyrrole, dimethylphenol, diethylphenol and the like are also effective.

〔The invention's effect〕

As described above, according to the present invention, when manufacturing a color filter using a micelle electrolysis method, easily and selectively on a desired electrode without forming another new dye film on a conductive dye film. Thus, a desired dye film could be formed only on the substrate. The present invention can be said to be an effective method for mass production from the viewpoint of its simplicity and low cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a pattern of a transparent electrode when a two-color filter is manufactured by micellar electrolysis. FIG. 2 is a diagram showing an example of a pattern of a transparent electrode when three color filters are manufactured by micellar electrolysis. FIG. 3 is a view showing an example of a pattern of a transparent electrode when three color filters are produced by micellar electrolysis. FIG. 4 is a view showing a pattern of a transparent electrode used in the embodiment of the present invention. 11 Transparent electrode 12 Transparent electrode 21 Transparent electrode 31 Transparent electrode 32 Transparent electrode 33 Electrically conductive part 34 Electrically conductive part 35 Dye film formed (Shaded area) 36 ... Transparent electrode 41 ... Transparent electrode 42 ... Transparent electrode 43 ... Transparent electrode 44 ... Electrically conducting part 45 ... Immersion area in dye colloid aqueous solution 46 ... Electrochemical polymerization Area immersed in electrolyte for forming a film 47 Area where an electrochemical polymerized film is formed 48 Area where electric conduction is made 49 Area where electric conduction is made

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02B 5/20

Claims (2)

(57) [Claims] 1. A position of one electrode end corresponding to a colored layer formed in a micelle aqueous solution containing, as basic components, pigment particles insoluble or hardly soluble in water, a surfactant charged by electrolysis, and a supporting electrolyte. A method for producing a color filter, in which a substrate provided with a plurality of electrodes formed differently and a current-carrying electrode are immersed, and the micelle aqueous solution is electrolyzed to selectively deposit a plurality of color pigment particles on the electrodes. A step of selecting an electrode for forming the first colored layer from the plurality of electrodes and electrically connecting the selected electrode to an end thereof; exposing one end of the electrode; A step of immersing the substrate in a first micelle aqueous solution in a state and depositing pigment particles on the electrode by electrolysis to form a first colored layer; one end of the electrode on which the first colored layer is formed; With the substrate exposed to the electrolyte A step of forming an insulating film or a high resistance film in a region adjacent to the first colored layer by immersion and electrolysis, and selecting an electrode for forming a second colored layer from the plurality of electrodes, and selecting Electrically conducting across the insulating film or the high-resistance film at each electrode end; immersing the substrate in a second micelle aqueous solution while exposing one end of the electrode; Depositing pigment particles on the electrode to form a second colored layer. 2. An electrode for forming a first colored layer is selected from the plurality of electrodes, and a first colored layer is formed on a region excluding one end of each of the selected electrodes. 2. The method for producing a color filter according to claim 1, wherein an insulating film or a high resistance film is formed on a part of one end by an electrochemical polymerization method.