JPH0267520A - Manufacture of multicolor liquid crystal display device - Google Patents

Abstract

PURPOSE:To make the title display device excellent in reliability and long in service life by providing a protective layer 4 on the surface of a color filter which is produced by electrodeposition and surface-treated with a silane coupling agent and oriented films 5 and 8 on the protective layer 4. CONSTITUTION:In order to uniformly apply a high polymer containing an epoxy radical for forming a protective layer 4 to surfaces of color filters 3 of a polyester melamine resin, surface treatment is made to the surfaces of the color filters 3 with a silane coupling agent. In other words, by performing surface treatment to the surfaces of the filters 3 with the silane coupling agent, the high polymer containing the epoxy radical constituting the protective layer 4 which cannot be applied uniformly in the conventional example can be applied to the surfaces without phenomena of 'expulsion', etc. Therefore, oriented films 5 and 8 can be fitted to the protective layer 4 and a multicolor liquid crystal display device having a uniform and highly reliable orienting state can be obtained.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a method for manufacturing a multicolor liquid crystal display device using a color filter manufactured by electrodeposition, and particularly to a method for aligning on an electrodeposited color filter with improved alignment reliability. . [Summary of the Invention] The present invention relates to a method for manufacturing a multicolor liquid crystal display device using an electrodeposited color filter, which involves treating the surface of the electrodeposited color filter with a silane coupling agent and then providing a protective layer on the color filter. By providing an alignment film thereon, the reliability of alignment is significantly improved. [Prior Art] Fig. 2 shows an example of a multicolor liquid crystal display device using a tSS color filter. In Fig. 2, 10 is a transparent substrate made of glass, and 11 is a transparent conductive substrate patterned with arbitrary figures or characters. The electrode 12 made of a film is a color filter formed by electrodeposition of an electrodepositable polymer and a dye, and is colored in a plurality of arbitrary colors with a pattern matching that of the electrode 11. The method of manufacturing color filters by electrodeposition has already been disclosed in Japanese Patent Application No. 57-233933, and is an effective means for manufacturing high-definition color filters by a simple method. 13 is an alignment film formed by printing, spin-coding, dipping, etc. from a polyimide solution; 14 is a transparent second electrode; and 15 is a transparent second substrate. A space sandwiched between two substrates 10 and 15 is filled with liquid crystal 16 to form a liquid crystal cell. When this liquid crystal cell is sandwiched between a polarizer and an analyzer and a voltage is applied, it becomes a multicolor liquid crystal display device that displays the colors of the color filters. Conventionally, as a material for an alignment film for aligning liquid crystal molecules, a material obtained by rubbing the surface of polyimide in a certain direction with cloth or the like is known. Moreover, polyester-melamine resin, acrylic-melamine resin, etc. are disclosed as materials for electrodeposited color filters. When attaching a polyimide film to a color filter made of a synthetic polymer surface in this way,
Polyimide itself has poor adhesion to color filters, and the thermal physical behavior of polyimide and filter materials is different, so the stress at the interface between polyimide and color filters tends to be large, which reduces the reliability of the alignment ability of polyimide alignment films. (Especially in a test where the color filter is left at a high temperature of 80°C, the orientation may be lost after about 100 hours.As one of the countermeasures for this problem, as stated in Japanese Patent Application No. 61-62390, There is a method of providing high reliability by providing a protective layer with a buffering capacity to alleviate stress on the color filter and attaching an alignment film on the protective layer.Third.
An example is shown in the figure. In Figure 3, 17 is a transparent substrate made of glass, 18 is an electrode made of a transparent conductive film patterned with arbitrary figures or letters, and 19 is an electrodeposition made of an electrodepositable polymer and a dye. Color filter formed by
20 is a protective layer made of a polymer containing an epoxy group; 21 is a second substrate 22 having a transparent electrode 23 of the apprentice 2 which has been subjected to a rubbing treatment with an alignment film made of polyimide; and an alignment l1124 which has been subjected to a rubbing treatment thereon; were pasted together, and the gap between them was filled with liquid crystal 25 to obtain a multicolor liquid crystal display device. It can be seen that the alignment reliability of the multicolor liquid crystal display device manufactured by the above manufacturing method is improved compared to the conventional device shown in FIG. 2, and that it has a buffering ability to alleviate the stress applied to the interface between the color filter and the alignment film. [Problem to be solved by the invention] Just as polyimide itself has poor adhesion on color filters made of polyester-melamine resin, it is difficult to uniformly apply the polymer containing epoxy groups that forms the protective layer. ” etc., the surface of the protective layer becomes uneven,
From this point on, the problem was that the alignment deteriorated and spread to the surrounding areas. [Means for Solving the Problems] The present invention is intended to solve the above problems, and is aimed at uniformly applying a polymer containing an epoxy group to form a protective layer on a color filter made of polyester-melamine resin. , the color filter surface is treated with a silane coupling agent. [Effect] In this way, by treating the surface of the color filter with a silane coupling agent, there is no phenomenon such as "repelling" of the polymer containing epoxy groups that forms the protective layer that could not be uniformly coated on the color filter. By applying an alignment film to this protective layer, a multicolor liquid crystal display device having a uniform and highly reliable alignment state was obtained. [Example] The present invention will be specifically described below using Examples and Comparative Examples.

Embodiment 1 FIG. 1 shows an example of a multicolor display device manufactured by the manufacturing method of the present invention. Transparent electrode 2 made of InzOa on a transparent glass substrate l
was buttered and formed. This substrate is immersed in an electrodeposition solution with the composition shown below, a positive voltage is applied to the transparent electrode on which a red filter is to be formed between the substrate and a negative voltage is applied to the counter electrode, and the substrate is pulled up and washed with water at 200°C for about 30 minutes. I baked it to create a red filter. A protective layer 4 was prepared using an electrodeposition solution. Next, the i! Solutions were prepared in which the red pigment in the solution was changed to a green pigment and a blue pigment, respectively, and green and blue filters were sequentially formed in the same manner to form a red, green, and blue multicolor filter 3. This glass substrate was dipped in a liquid in which a silane coupling agent having the structure shown below was dissolved in the following manner, and then dried with fluorocarbon vapor to perform surface treatment of a color filter. HJCH2C1bNHCH2CHiCHzSi (0(
A solution having the following composition was applied onto this filter using a spin cord, and then heated and cured at 200°C for 1 hour. On top of the protective layer 4, 10 wt of polyimide represented by the following formula was applied.
% cyclohexane solution was applied by spin code method,
After baking at 200° C. for 1 hour, the surface was rubbed in a certain direction with a cotton cloth to form an alignment layer 5. After that, a second transparent electrode 7 is provided on the glass substrate 6 of the cylinder 2,
An alignment film 8 was formed thereon, and the rubbed substrate 1 was bonded to the substrate 1 facing each other, and the gap therebetween was filled with liquid crystal 9 to obtain a multicolor liquid crystal display device. When this multicolor liquid crystal display device was left at a high temperature of 80° C., the alignment state remained good and almost no deterioration was observed even after 100 hours. [Comparative Example 1] A multicolor liquid crystal display device was manufactured in the same manner as in Example 1 except that the color filter surface treatment in Example 1 was not performed. When this multicolor liquid crystal display device was left at a high temperature of 80° C., alignment deterioration occurred in areas where the protective layer “repelled” because it could not be applied uniformly, and spread to almost the entire area within 500 hours. [Comparative Example 2] A multicolor liquid crystal display device was produced in the same manner as in Example 1 except that the protective layer in Example 1 was not applied. When this multicolor liquid crystal display device was left at a high temperature of 80° C., almost no alignment occurred after 250 hours. [Example 2] The protective layer in Example 1 was formed by spin-coding from a 10 wt% ethyl cellosolve acetate solution of epoxy-modified acrylic (M resin) and baked at 200°C for lhr. When a multicolor liquid crystal display device was created in 2009, the same effects as in Example 1 were obtained. [Effects of the Invention] As described above in the Examples, according to the present invention, the surface of a color filter created by electrodeposition After the surface is treated with a silane coupling agent, a protective layer is placed on top of the protective layer, and an alignment film is further placed on top of this to provide a multicolor liquid crystal display device with excellent reliability and guaranteed long life. I can do that.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a specific example of a multicolor liquid crystal display device manufactured by the manufacturing method of the present invention, and FIGS. 2 and 3 are longitudinal sectional views showing an example of a multicolor liquid crystal display device to which an electrodeposited color filter is applied. It is. l, 6.10.15.17.22...Transparent substrate 2.7.
11.14.18.23...Transparent electrode 3.12.19.
・・・・・・・・・Color filter 4゜20 ・・Protective layer 5. 8, l 3. 2 l, 24...Alignment film 9. 16゜25 ・・Cross-sectional product of liquid crystal display device as shown in Figure 1

Claims (1)

[Claims] (1) In a method for manufacturing a multicolor liquid crystal display device using a color filter, a plurality of conductive layers arranged insulated from each other are formed on a substrate, and then an electrodeposition polymer is deposited on the conductive layers. Color filters are sequentially formed selectively by electrodeposition from a solution in which pigments are dispersed, and the surface of the color filter is treated with a silane coupling agent, and then
A method for manufacturing a multicolor liquid crystal display device, comprising sequentially laminating a protective layer and an alignment film on the color filter.