JPH0644083B2 - Manufacturing method of multicolor display device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor display device to which a color filter is applied and a method for manufacturing the same, and in particular, it is manufactured by a polymer resin layer formed by cationic electrodeposition. To a method for manufacturing a multicolor display device having the above-mentioned color filter.

Prior Art FIG. 1 shows a cross-sectional view of an example of a multicolor display device to which a conventional color filter is applied. In FIG. 1, 1
Is a transparent substrate, 2, 2 ', 2 "are display electrodes made of a transparent conductive layer patterned with arbitrary figures or characters, 3,
3 ', 3 "are color filters formed in close contact with the surfaces of the display electrodes 2, 2', 2", 4 is a transparent counter electrode, 5 '
Is a transparent counter substrate, and 6 is a spacer. In such a multi-color display device, a space 7 sandwiched between two substrates 1 and 5
If a color filter 3, 3 ′, 3 ″ is formed in a different color tone by filling a substance such as a liquid crystal or an electrochromic material that functions as an optical shutter that opens and closes by applying a voltage, the display electrode 2 , 2 ', 2 "and the counter electrode 4 are selectively applied with a voltage to enable multicolor display.

The multicolor display using a color filter has a very large practical effect because the method is simple, a free color tone is easily obtained, and it can be used in combination with various display materials and systems.

However, when manufacturing a multi-color display device using a color filter, the pattern of the display electrode and the pattern of the color filter formed on the surface of the display electrode must be manufactured so as not to shift. I won't. In particular, in the case of realizing a car graphic display using a fine pattern of three primary colors, the matching of the patterns of the display electrodes and the color filters is an important problem that is difficult to manufacture. In addition, color change to make multiple colors is also a factor that complicates the process, and particularly when trying to realize coloring by dyeing with a dye, an already colored portion is not dyed twice by the next dyeing process. As described above, the process of resisting dyeing gets in between and becomes more complicated. Furthermore, the dye-resisting technique itself is a difficult problem that must be considered individually for each dye.

Generally, as a method of creating a color filter,
Those using means such as screen printing and photolithography have been considered. Screen printing does not require anti-staining, but there is a limit to the miniaturization of the pattern, and the accuracy of the printing position becomes worse as the number of colors increases, and a deviation from the display pattern occurs. Although fine patterns are possible with Photolithography, it is necessary to pass through the Photolithography process every time the color is changed, and a dyeing prevention method that prevents double dyeing is required during dyeing, making the process extremely complicated. Therefore, the advantage of simple multicolor changing means is lost.

Therefore, the inventors of the present invention used to file Japanese Patent Application No. 57-233933.
In the simple method, the multi-color display device uses a robust color filter that does not cause a pattern shift even if the display pattern is fine, and can change the color without special dye-proofing. As a manufacturing method of the above, a method of manufacturing using a polymer resin electrodeposition method was proposed.

OBJECT OF THE INVENTION It is an object of the present invention to provide a method for further improving the multicolor display device using the color filter produced by the polymer resin electrodeposition method.

That is, the present invention, by using a specific cationic polymer resin electrodeposition bath as the polymer resin electrodeposition bath, in addition to the features of the polymer resin electrodeposition method described above, the colored layer of the conductive layer It was found that the material of the conductive layer can be used in a wider range because it is not easily affected, and that the stability of the electrodeposition bath is high. A method for manufacturing a color display device is provided. For that purpose, a multicolor display device is manufactured by using a conductive thin film layer on a substrate as an electrode and a color filter obtained by an electrodeposition method from a polymer resin electrodeposition bath containing a cationic polymer resin and a dye.

In order to produce the color filter used in the present invention, the conductive thin film layer is subjected to desired patterning by vapor deposition using a mask, sputtering, etching, etc. It is possible to form a colored layer in which the pattern position is not displaced by selectively electrodepositing on. Further, by repeating this operation, the colored layer is not formed again in the portion that has been electrodeposited once, so that it is possible to easily obtain multiple colors. The substrate used in this method has only to have an insulating surface, and the material and shape thereof are not limited by selecting a conductive thin film layer having good adhesion to the substrate.

In addition, the conductive thin film layer on which the colored layer is formed is cationically electrodepositable and is on the cathode side, so it is electrochemically stable because it does not inherently cause an elution reaction, and the cationic electrodeposition liquid is anionic. It is difficult to use the anionic electrodeposition liquid because the colored layer is formed with a smaller amount of electricity because the composition has higher current efficiency (weight of coating film applied by unit electricity amount) than the electrodeposition liquid. It is possible to form a stable colored layer on the conductive thin film layer mainly composed of indium oxide.

Structure of the Invention An example of a method for forming a colored layer by electrodeposition of a cationic polymer resin, which is an important point of the present invention, will be described below.

In this method, first, a conductive thin film layer is patterned as an insulating substrate on a glass substrate as described above (hereinafter, this is referred to as a transparent conductive pattern). Secondly, the cationic polymer resin electrodeposition composition is pure and diluted to a solid content of about 4 to 25% by weight in a polymer resin electrodeposition bath containing platinum,
Immerse the counter electrode such as stainless steel and the glass substrate provided with the above-mentioned transparent conductive pattern. Next, between the transparent electrode pattern to be colored and the counter electrode, the pattern is used as a cathode and the amount is about 5 to 30.
A DC voltage of 0V is applied. By this application, the polymer resin electrodeposition composition migrates only on the pattern to which a voltage is applied,
It is deposited as a coating film to color the transparent electrode pattern. In order to obtain the required film thickness, the electrodeposition conditions such as voltage, electrodeposition time and liquid temperature are adjusted. The usual dry film thickness is 5 μm or less. The electrodeposition time is usually 5 to 180 seconds, and the liquid temperature is 10 to 30 ° C. When the electrodeposition time for obtaining the required film thickness has passed, the energization is stopped, the glass substrate is taken out of the bath, and the bath liquid adhering to the surface is thoroughly washed with pure water and then heated to cure the coating film. In this way, one colored transparent electrode pattern is formed. Third, for example, in the case of making a multicolor filter of three colors of red, green, and blue, the second coloring step described above is performed for each transparent electrode pattern that requires coloring for the other two colors. Repeat. As described above, a three-color multicolor filter is produced by the cationic polymer resin electrodeposition method.

This method does not require a photolithography step for coloring, and is simple because it does not require a stain-proofing treatment, and that the transparent electrode pattern and the colored layer match, a fine pattern. This is a method that sufficiently solves the drawbacks of the photolithographic method and the printing method, such as being colored.

The polymer resin electrodeposition method includes an anionic polymer resin electrodeposition method in addition to the cationic polymer resin electrodeposition method. The cationic polymer resin electrodeposition method is practically superior to the anionic polymer resin electrodeposition method. That is, since the cationic polymer resin used in the electrodeposition method of the cationic polymer resin is essentially less hydrolyzable than the anionic polymer resin, the electrodeposition bath is stable. In the cationic polymer resin electrodeposition method, in the anionic polymer resin electrodeposition method,
While polymer resin is deposited on the anode side during electrodeposition,
Since it is deposited on the side of the cathode (cathode) that does not electrochemically elute the electrode, and because it is possible to obtain a higher current efficiency than the anionic compositionally, it is less susceptible to the electrodeposited material, Further, a wider material can be used for the conductive thin film layer, which has less influence on it. In particular, it is possible to stably form a colored layer on a conductive thin film layer mainly composed of indium oxide, which is relatively easily chemically affected and is difficult to perform by anionic electrodeposition.

Next, the cationic polymer resin electrodeposition bath used in the present invention will be described. This constitution is composed of (i) a cationic synthetic polymer resin as a film-forming component of the coating film, (ii) a pigment such as a pigment or a dye which is transparent and gives color to the coating film, and other components such as (iii) ) Organic solvents used for adjusting electrodeposition characteristics and bath solution stability, and for facilitating production, (i
It consists of v) an acidic substance for making the cationic polymer resin soluble in water, and (v) various auxiliaries for improving the coating film surface, electrodeposition characteristics, bath solution stability and the like.

The configuration contents will be described below.

Cationic synthetic polymer resins used as the film-forming component of the coating film are acrylic resin, epoxy resin, urethane resin,
There are polybutadiene resin, polyamide resin and the like, which are used alone or in a mixture or in combination with a crosslinkable resin such as urethane resin and polyester resin. Each resin has a basic group such as an onium group such as amino group, ammonium and sulfonium in the molecule, and is solubilized in water with an acid or an acidic substance such as succinic acid, formic acid, propionic acid and lactic acid. use.

The amount of acid or acidic substance used is usually indicated by MEQ. The measuring method is described in Examples. The amount is an important characteristic value because it greatly affects the stability of the electrodeposition bath, the current efficiency, the finished state of the colored layer, the state of the conductive thin film layer, and the like. The MEQ value in the generally used cationic polymer resin electrodeposition method is 15 to 70, but in the present invention, 15 to 50 is a range to which the MEQ value is applied, and preferably 20 to 40. When it is less than 15, the stability of the electrodeposition bath may be lacking because the water dispersibility of the polymer resin used is impaired, and when it is more than 50, the current efficiency is lowered, the colored layer is not formed properly, or the conductivity of the electrode is reduced. The destruction of the thin film layer may occur. MEQ value of anion electrodeposition bath is usually 4
The efficiency is as high as 0 to 130, and the current efficiency by the cation electrodeposition method is higher than that of the anion electrodeposition method, and the value can be double or more.

Acrylic resin, epoxy resin, or a mixture thereof, or a combination with an urethane resin is a preferable resin in terms of transparency and color characteristics. The manufacturing method of these polymer resins varies depending on the type thereof, but an acrylic resin will be described as an example. It is obtained by radical copolymerization of monomers having a vinyl group such as acrylic resin leaf, acrylic acid ester, methacrylic acid ester and styrene. Its composition is (i) the amount of base in the resin for solubilization, (i
i) amount of functional group for imparting reactivity, (iii) hardness,
(iv) Determined in consideration of coating film performance and the like. The base is introduced into the resin by introducing a oxirane group into the resin using glycidyl acrylate or methacrylate, and adding an amine to the oxirane group to obtain a secondary or tertiary amino group, or a base which is originally a base. There is a method of using amino acrylate or methacrylate such as tert-butylaminoethylmethacrylate or dimethylaminoethylmethacrylate, or vinylpyridine having properties. The degree of basicity is indicated by the base number of the resin and has an important characteristic value because it greatly affects the degree of solubilization and the electrodeposition characteristics, and is usually 0.2 to 2.0, preferably 0.4 to 1. It is 0. When the base number is 0.2 or less, the dispersibility in water may be poor and the stability may be poor, and when the base number is 2.0 or more, the current efficiency may be lowered, or the colored layer may be poorly formed. This numerical value is not limited to acrylic resins, but applies to all cationic resins. In addition, a hydroxyl group or an amide group is introduced into the resin in order to impart water dispersion stability and reactivity using hydroxy acrylate or acrylic acid amide. Once the monomer composition has been determined, normal polymerization
Solution polymerization is carried out using a general radical polymerization initiator in a hydrophilic solvent. Is the obtained resin self-crosslinking,
Alternatively, it is optionally used in combination with a crosslinkable resin such as a urethane resin having a blocked NCO group.

Pigments or dyes are used as pigments that are transparent and give electrodeposition, but for pigments the transparency of the resulting coating film, for dyes, bath stability, electrodeposition characteristics, coating film durability, etc. You must choose one that does not cause a problem with. From this point of view, suitable pigments are phthalocyanine-based and slene-based organic pigments, iron oxide and other oxide inorganic pigments, and dyes are oil-soluble or dispersible dyes. Dyes such as pigments to be used are preferably purified and used to remove impurities because a good coating film can be obtained.

Organic solvents are added to the composition for the purpose of i) obtaining a smooth coating film, ii) improving bath solution stability, and iii) facilitating dispersion. As the type, hydrophilic solvents such as cellosolves such as ethyl, butyl and methyl cellosolve, alcohols such as isopropanol and butanol, glycols and carbitols are mainly used, but in some cases, hydrophobic properties such as xylol, toluol and mineral terpen A solvent can also be used. Examples of the auxiliaries used include a dispersant that improves the dispersibility of the pigment, a leveling agent that improves the smoothness of the coating film, and an antifoaming agent that stops the foaming of the bath.

The dyes used are commonly used sand mills,
Although it is dispersed using a disperser such as a pearl mill, a roll mill and an attritor, it must be sufficiently dispersed to obtain the transparency and smoothness of the coating film. The dispersed dyes are well mixed with a solvent-diluted and neutralized cationic polymeric resin. Next, auxiliaries are added, and finally pure water is added to a predetermined concentration,
Usually, it is diluted to a solid content of about 4 to 25% and then subjected to the electrodeposition method.

The present invention will be described below with reference to examples. Unless otherwise specified, the central part of a sentence is a weight part.

Example 1 The following three-color cationic electrodeposition solution was prepared.

The bath was prepared by mixing 55.0 parts of acrylic resin, 18.0 parts of ethyl cellosolve, 3.0 parts of isopropyl alcohol, and 5.0 parts of each pigment, and mixing this mixture with a laboratory sand grind mill (Asada Iron Works Co., Ltd. (Manufactured by Kuraray Co., Ltd.) until the particle size of the pigment becomes 0.4 μm or less, the dispersed mixture is neutralized with acetic acid, and then diluted with ion-exchanged water. The obtained bath liquid has a MEQ of 40. The special features of the acrylic resin used are
Nonvolatile content 75%, base number 1.0, viscosity 60 poise (25
℃). The base number was measured by the following method.

Measurement of Base Number An unneutralized basic resin containing no acidic compound is collected in an Erlenmeyer flask so that the solid content is about 1 g. Add 60 cc of dioxane and dissolve well (sometimes warm). Add 2-3 drops of methyl red and add 1 / 10N-HCl
The "CC number" required until the color change point is converted per 1 g of the basic resin, and the value is used as the base number of the basic resin.

The MEQ was measured by the following method.

20 ml sample is precisely weighed and 100 ml tetrahydrofuran
Is added and placed under stirring, the pH is measured with a pH meter while a 1/10 N-alcoholic KOH solution is added dropwise, and a titration curve is drawn. From the two inflection points of the titration curve, the midpoint is determined, and the titer of the 1/10 N-alcoholic KOH solution required up to the midpoint is determined. Then, calculate the acid concentration according to the following MEQ formula.

Where V: 1/10 N-alcoholic KO required up to midpoint
Titration amount of H solution (ml) f: Titer of 1/10 N-alcoholic KOH solution S: Weight of sample (g) C: Heating residue of sample FIG. 2 shows a method for producing a color filter according to the present invention. It is an example of a cross-sectional view of an applied multicolor display device.

The creation method will be described in detail below.

The patterning step 8 is a display substrate made of a transparent material, and an indium oxide transparent conductive film is formed on the display substrate by a spray coating method. The transparent conductive film is patterned into a stripe shape by etching to obtain a display electrode 9.

Electrodeposition Step The display substrate 8 having the display electrodes 9 formed thereon is immersed in the electrodeposition bath prepared as described above. An electrode desired to be colored in the same color is selected among the display electrodes 9 patterned in a stripe shape, and a voltage of 20 V is applied for 3 minutes with the selected electrode as a cathode. After energization, the display substrate 8 is pulled up and washed thoroughly with water to wash away the solution adhering to the portion to which no voltage is applied. After washing with water and drying, a colored layer having good transparency is formed on the electrode to which a voltage has been applied.

Curing Step Next, the acrylic resin in the colored layer formed by electrodeposition is baked to cause a crosslinking reaction to be cured. When baking is performed in air at 175 ° C. for 30 minutes, the colored layer is completely cured. The cured colored layer will not be re-deposited even if it is immersed in the electrodeposition bath again.Therefore, for the second and subsequent formation of the colored layer, a display electrode having a different color was selected again. It is realized by repeating the steps of electrodeposition and curing in an electrodeposition bath in which pigments of different colors are dispersed.

In the present embodiment, a striped color filter 10 having a width of 200 μm in the order of red, blue and green is applied to a patterning process → a red electrode electrodeposition process → a curing process → a blue electrode electrodeposition process → a curing process → a green electrode electrode. It was manufactured by the method of coating process → curing process, and it was performed very easily. The color filter obtained had no color shift, was uniform, and had the property of being resistant to acid, alkali, various organic solvents, hot water, and the like.
The pigment used was extremely stable in the colored layer and had an initial light absorption rate of 9% even after 360 hours of the carbon arc test.
It showed a value of 5% or more and had excellent light resistance.

In this way, the color filter 10 can display the display electrode 9
The display substrate 8 is integrally formed on the display substrate 9 so that the stripes of the display electrode 9 and the counter electrode 11 intersect at right angles via the spacer 13 and the transparent counter substrate 12 having the transparent counter electrode 11 formed in a stripe shape. And configure cells. TN-FEM liquid crystal is filled as the display material 14 in the cell,
A multicolor liquid crystal display device was manufactured. In this case, a voltage is applied between the display electrode 9 and the counter electrode 11, and the cell is sandwiched between the polarizer and the detector whose transmission axes are parallel to each other, and is transparent when viewed from the direction of the display substrate 8 or the counter substrate 12. Color filter 1
A color of 0 is displayed, and when the voltage application is stopped, it becomes black.
When the light is irradiated from the direction of the counter substrate 12, the color of the color filter 10 is displayed more effectively because the cell has good transparency.

Thus, the manufacturing method of the multicolor display device of the present embodiment, despite the simple manufacturing method, without impairing the display quality,
Indium oxide is suitable for providing a highly reliable low-voltage matrix-driven color graphic display device that can obtain a color filter with a fine pattern, and that is difficult to electrodeposit with an anion electrodeposition solution. It was clarified that it can be applied to a display substrate having a display electrode formed of a transparent conductive film.

Example 2 In the same manner as in Example 1, the display material 14 in Example 1 is a negative-type guest-host liquid crystal using a black dichroic dye, and the display substrate 8 is a white material (white ceramic). Created the device. In this case, a voltage is applied between the display electrode 9 and the counter electrode 11, and when viewed from the direction of the transparent counter substrate 12 via the deflecting plate, the color filter 10 is obtained.
Is displayed brightly, and when the voltage application is stopped, it becomes black which is the color of the dichroic dye in the liquid crystal. Also in this embodiment,
The same effect as in Example 1 was obtained.

Example 3 The display material 14 in Example 1 was DSM liquid crystal, and the display electrode 8 was formed by patterning arnium in the display substrate 8 by mask vapor deposition. Then, a multicolor liquid crystal display device was prepared in the same manner as in Example 1. In this case, when a voltage is applied between the display electrode 9 and the counter electrode 11 and viewed from the transparent counter substrate 12, the DSM liquid crystal is in a light scattering state, and the color of the color filter 10 is displayed in milky white. . When the voltage application is stopped, the light scattering state disappears, resulting in a dark color state. In order to efficiently generate the light-scattering state of the DSM liquid crystal, it is necessary to flow a certain amount of ion current, and the high resistance of the color filter 10 hinders it. Therefore, by providing a transparent electrode having a pattern matching the display electrode 9 on the color filter 10 and using the transparent electrode as a voltage application electrode, the driving voltage can be reduced, and the same effect as in Example 1 can be obtained. .

Example 4 The following three-color cationic electrodeposition solution was prepared.

75% by weight of non-volatile content used in Example 1, base number 1.0,
450 parts of an acrylic resin having a viscosity of 60 poise (25 ° C.), 20.0 parts of ethyl cellosolve, and 3.0 parts of isopropyl alcohol are mixed. Acetic acid is added to this mixture with stirring to neutralize it, and then diluted with water.

On the other hand, 80.0 parts of methyl cellosolve, blue, green,
5.0 parts of each red dye is dissolved under stirring. Add this dissolved material to the acrylic resin aqueous solution created earlier,
A cationic electrodeposition solution having a MEQ of 35, namely, blue, green, and red, was prepared.

Using this three-color electrodeposition bath, a multicolor display device was prepared in the same manner as in Example 1, and the same effect as in Example 1 was obtained.

Example 5 The following three color cationic electrodeposition bath solutions were prepared.

The amino epoxy isocyanate resin was prepared as follows.

Epikote # 1004 336 copies, Epikote # 100
1 143 parts and 140 parts of ethyl cellosolve were mixed and stirred to be completely dissolved. The temperature was raised to 50 ° C., and a solution of 59 parts of diethanolamine and 20 parts of isopropyl alcohol was added with stirring for 1 hour. After the addition, the temperature was maintained at 80 to 85 ° C for 3 hours. A solution of 202 parts of adduct B-1065 and 100 parts of ethyl cellosolve was added to the above with stirring for 30 minutes, and further maintained at 80 to 85 ° C. for 1 hour and 30 minutes,
An amino epoxy isocyanate resin was obtained. The nonvolatile content of this resin was 74% and the base number was 1.0.

55.0 parts of the aminoepoxy isocyanate resin, 18.0 parts of ethyl cellosolve, 3.0 of isopyropyr alcohol
Parts, and 5.0 parts of each of blue, green, and red pigments were mixed, and dispersed by an experimental sand grind mill (manufactured by Asada Iron Works Co., Ltd.) until the pigment particle size was 0.3 μm or less. 1.2 parts of acetic acid was added to the dispersed mixture with stirring to neutralize it, and then diluted with water to prepare a cationic electrodeposition solution having an MEQ of 40.

A multicolor display device was prepared in the same manner as in Example 1 by using these three-color electrodeposition bath solutions, and the same effects as in Example 1 were obtained.

Example 6 The display electrode 9 in Example 1 was made of a tin oxide transparent conductive film, and a multicolor display device was made by the same method as in Example 1 below to obtain the same effects as in Example 1.

Comparative Example 1 The following anion electrodeposition bath solution was prepared.

Non-volatile content 75%, acid value 50 KOH / g, viscosity 60 poise (25 ° C) polyester resin 95.0 parts, butyl cellosolve 25.0 parts, ethyl cellosolve 5.0 parts, n-butanol 18.0 parts and phthalocyanine blue SR -1
50 C was mixed and dispersed with a laboratory sand grind mill (manufactured by Asada Iron Works Co., Ltd.) until the pigment particle size was 0.4 μm or less. Triethylamine was added to the dispersed mixture under stirring to neutralize it, and then diluted with ion-exchanged water to prepare an anion electrodeposition bath solution.

The acid value was measured by the following method.

Method for measuring acid value A fixed amount of resin is dissolved in a fixed amount of alcohol or ether, and the solution is titrated with 1/2 normal potassium hydroxide using phenolphthalein as an indicator.

The mg number of potassium hydroxide required for titration is converted into 1 g of resin solid content, and the value is taken as the acid value.

The display substrate 8 having the display electrode 9 used in Example 1 and having a transparent conductive film of indium oxide formed in the electrodeposition bath solution.
And the display electrode 9 as an anode and between the counter electrode and the counter electrode.
A voltage of V was applied for 3 minutes, and after pulling it up and washing with water and drying, the colored layer formed on the display electrode 9 was rough in practical use and was not good in practice.

Comparative Example 2 The following cationic electrodeposition bath solution was prepared.

As in Example 1, a special acrylic resin having a nonvolatile content of 75%, a base number of 1.0, and a viscosity of 60 poise (25 ° C.) was used. The bath was prepared in the same manner as in Example 1 except that the amounts of raw materials used were different, to obtain a cationic electrodeposition bath solution having an MEQ of 60.

The display substrate formed of the tin oxide transparent conductive film used in Example 2 was immersed in this bath solution, and electrodeposition was performed in the same manner as in Example 1, but the formed colored layer had a rough surface. Was caused and was practically bad.

Comparative Example 3 The following cationic electrodeposition bath was prepared.

As in Example 1, a special number of acrylic resin having a non-volatile content of 75%, a base number of 1.0, and a viscosity of 60 poise (25 ° C.) was used.

The method for preparing the bath is the same as in Example 1 except that the amounts of raw materials used are different.
A cation electrodeposition bath solution having an MEQ of 10 was obtained by the same method as in Example 1, but this bath solution was an extremely unstable bath solution containing aggregates of acrylic resin and was not suitable for practical use.

Comparative Example 4 The following cationic electrodeposition bath was prepared.

A bath solution having a MEQ of 40 was prepared in the same manner as in Example 1 except that a non-volatile resin having a nonvolatile content of 75%, a base number of 0.1, and a viscosity of 40 poise (25 ° C.) was used as the cationic acrylic resin. Created.

This bath liquid was an extremely unstable bath liquid containing agglomerates of acrylic resin and was not suitable for practical use.

Comparative Example 5 The following cationic electrodeposition bath was prepared.

A bath solution having a MEQ of 40 was prepared in the same manner as in Example 1 except that a specific number of resins having a nonvolatile content of 75%, a base number of 3.0 and a viscosity of 100 poise (25 ° C.) was used as the cationic acrylic resin. Created.

A display substrate having a display electrode formed of the indium oxide transparent conductive film used in Example 1 was immersed in this bath solution,
Electrodeposition was carried out in the same manner as in Example 1, but the obtained colored layer had rough skin and was practically inferior.

EFFECTS OF THE INVENTION As described above in detail in the embodiments, the method for manufacturing a multicolor display device according to the present invention is simple, and special means such as dye-proofing for separating colors for multicoloring is used. It is possible to produce a color filter without using a cation electrodeposition electrode, and since it is a cation electrodeposition bath, it is difficult to electrodeposition in an anion electrodeposition bath. It is also applicable to a multicolor display device. Further, the color filter is robust and has no pattern shift, and can achieve high display quality and reliability even when combined with a display material such as liquid crystal.

[Brief description of drawings]

FIG. 1 is a sectional view of an example of a multicolor display device to which a conventional color filter is applied, and FIG. 2 is a sectional view of an example of a multicolor display device according to the manufacturing method of the present invention. 1,8 ...... Display substrate 2,9 ...... Display electrode 3,10 ...... Color filter 4,11 …… Counter electrode 5,12 …… Counter substrate 7,14 …… Display material

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Mitsuru Suginoya 6-31-1 Kameido, Koto-ku, Tokyo Seiko Electronics Co., Ltd. (72) Inventor Yutaka Sano 6-31-1 Kameido, Koto-ku, Tokyo No. Seiko Electronics Co., Ltd. (72) Inventor Yumiko Terada 6-31-1 Kameido, Koto-ku, Tokyo Seiko Electronics Co., Ltd. (72) Naoki Kato 6-31-1 Kameido, Koto-ku, Tokyo No. Seiko Denshi Kogyo Co., Ltd. (72) Inventor Taeyuki Suzuki 3-17 Yamanone, Zushi City, Kanagawa Prefecture (72) Inventor Junichi Yasukawa 2-13-13, South East Coast, Chigasaki City, Kanagawa Prefecture (72 ) Inventor Toyowa Nomura 5-1-1, Higashi-Narashino, Narashino-shi, Chiba (72) Inventor Kazuo Toda 6-6-14, Kanamachi, Katsushika-ku, Tokyo (72) Inventor Shinji Ito Prefecture Narashino Higashinarashino 3-chome No. 7 No. 24 (56) Reference Patent Sho 59-90818 (JP, A) JP Akira 60-33507 (JP, A)

Claims (1)

[Claims] 1. A method of manufacturing a multicolor display device to which a multicolor color filter is applied, wherein the multicolor color filter is provided on a plurality of conductive layers which are disposed on a substrate so as to be insulated from each other, and a cationic polymer resin. A colored layer is selectively formed from an electrodeposition liquid by electrodeposition, and thereafter, the operation is repeated with a cationic polymer resin electrodeposition liquid of different colors to form a multicolored layer, and the cationic polymer resin. Has a base number of 0.2 to 2.0 and a MEQ of the electrodeposition liquid of 15 to 50, and a method for producing a multicolor display device.