JPH03132722A - Color liquid crystal electrooptical element - Google Patents

Abstract

PURPOSE:To prevent the destruction in sealing parts at the time of injection of a liquid crystal by constituting the above element in such a manner that the surface coating layer of a color filter substrate is not formed in the liquid crystal sealing part of a seal. CONSTITUTION:A thermosetting resin of a polyimide system is applied on the colored layer 12 formed on a transparent substrate 11 and is baked to form the coating layer 13. The surface coating layer 14 is so formed by flexographic printing in such a manner that this layer does not cover the liquid crystal injection port 20 and is formed in the part corresponding to transparent electrode patterns 15. The transparent electrodes 15 are then formed by a low-temp. sputtering method and are patterned by an acid etching liquid. Further, an oriented layer 16 consisting of the polyimide resin is formed so as not to cover the seal 18. The element is constituted in such a manner that the injection port sealing part 18 to be most applied with stresses at the time of liquid crystal injection does not continue onto the surface coating layer 14 having a relatively weak adhesive property, by which the adhesive strength between the respective layers near this part is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a liquid crystal electro-optical element incorporating a color filter.

[Prior art] The color filter substrate of the conventional color liquid crystal electro-optical element is
Dyeing method, printing method, electrodeposition method,
Color resist methods and the like are known. However, each method essentially has a limit in thickness control within a color or between colors, and furthermore, defects due to contamination of dust cannot be avoided.

Therefore, methods have been proposed in which a coat layer is provided on the colored layer and then the coat layer is polished, or a method in which the colored layer itself is polished.
A smooth color filter can now be obtained.

However, if a transparent electrode is formed in this state, the transparent electrode will break due to scratches caused by polishing or penetration of etching solution from dust spots, making electrode formation difficult. Therefore, a thin surface coating layer is formed over the entire polished surface. This prevents wire breakage. Therefore, regarding the structure of the seal portion of the color filter substrate, the seal of the liquid crystal injection port portion has a structure in which it is in contact with the surface coat layer on the color filter.

[Problems to be Solved by the Invention] However, with the conventional color filter substrate structure and seal structure, the adhesion between the surface coat layer and the polished coat layer is extremely weak, making it difficult to assemble the panel. During the vacuum injection of liquid crystal, stress caused by the pressure difference between the inside and outside of the substrate caused destruction at the injection seal portion, which occurred at point U. Therefore, in order to solve these conventional problems, the present invention provides a color liquid crystal electro-optical element that has a structure that provides sufficient adhesion strength at the injection port seal part and that can prevent disconnection of the transparent electrode. The purpose is to provide

[Means for Solving the Problems] The color liquid crystal electro-optical element of the present invention comprises a surface coating layer formed after polishing at least a color filter or a coating layer on the color filter, and further comprising a patterned transparent electrode. In a color liquid crystal electro-optical element in which a color filter substrate and a counter substrate having an electrode pattern are fixed via a seal and liquid crystal is injected and sealed, the surface coating layer of the color filter substrate is at least as thick as the liquid crystal of the seal. [Function] In the injection port seal part on the color filter substrate side configured as described above, the seal and the coated surface contact without intervening the surface coat layer, so that both Sufficient adhesion is obtained at the interface of
Breakage at the seal portion during liquid crystal injection can be prevented.

Hereinafter, the details of the present invention will be shown by examples.

[Example] FIG. 1 is a schematic diagram showing the structure of a color liquid crystal electro-optical element in an example of the present invention.

FIG. 1(a) is a cross-sectional view of the element, and FIG. 1(b) is
1 is a schematic diagram of a color filter substrate of a color liquid crystal electro-optical device viewed from the front.

After cleaning the transparent substrate 11, a colored layer 12 was formed using a color resist method. A polyimide-based thermosetting resin was coated on the obtained colored layer 12 by a roll coating method and baked to form a coat layer 13 having a thickness of about 20 μm. Since the surface of the color filter thus obtained had a step difference, polishing was performed to flatten it. The polishing process was divided into a lapping process using a PVA grindstone and a polishing process using alumina abrasive grains. After cleaning this substrate, a surface coating layer 14 is applied by flexographic printing to the liquid crystal injection port 2 as shown in FIG.
Approximately 2,000 electrodes were formed so as not to overlap with 0 and to be formed in the area corresponding to the transparent electrode pattern 15. Next, the transparent electrode 15 is formed by about 2
000 people were formed and patterned using an acid-based etching solution. Furthermore, an alignment layer 16 made of polyimide resin is formed on this.
was formed so as not to cover the seal 18. On the other hand, for the counter electrode substrate, transparent electrodes 15 were formed in a pattern on a transparent substrate 19, and an alignment layer 16 was provided in the same manner as the color filter substrate. Furthermore, a sealing material made by mixing an epoxy thermosetting resin and a spacer for gap control was formed on these two substrates by screen printing, and the two substrates were bonded together and heated under pressure to produce a panel.

Figure 2 shows a conventional example for comparison, and Figure 2 (a) shows
FIG. 2(b) is a cross-sectional view of the device, and is a schematic diagram of the color filter substrate of the color liquid crystal electro-optical device viewed from the front. In the conventional example, the surface coating layer 1 is coated up to the injection port 20.
4 is formed.

A liquid crystal 17 was placed on each panel obtained in this way.
was injected by vacuum injection. In the structure of the present invention, liquid crystal injection was successfully performed without damaging the panel even at an ultimate vacuum level of 1xlO-3Toor.

On the other hand, in the panel of the conventional example shown in FIG. 2, destruction occurred at the inlet seal portion when the inside of the vacuum chamber was around 10 to 30 T○Or.

[Effects of the Invention] As described above, according to the present invention, since the injection port seal part, which is subjected to the most stress during liquid crystal injection, is not placed on the surface coating layer with relatively weak adhesion, the gaps between each layer in this vicinity are Adhesion strength can be dramatically improved compared to conventional structures. As a result, problems such as panel breakage during panel assembly can be reliably prevented, resulting in a significant improvement in mass production yield, and the effects brought about by this are extremely large.

[Brief explanation of the drawing]

FIG. 1 shows the structure of a color liquid crystal electro-optical device in an embodiment of the present invention, FIG. 1(a) is a cross-sectional view of the device, and FIG. 1(b) is a
1 is a schematic diagram of a color filter substrate of a color liquid crystal electro-optical device viewed from the front. FIG. 2 shows a conventional example, FIG. 2(a) is a sectional view of the device, and FIG. 2(b) is a schematic diagram of a color filter substrate of a color liquid crystal electro-optical device viewed from the front. , 11... Color filter substrate 12... Colored layer 13... Coating layer 14... Surface coating layer 15... Transparent electrode 16... Alignment layer 17... Liquid crystal 18... Seal 19 ... Counter substrate 20 ... Inlet

Claims (1)

[Claims] After polishing at least the color filter or the coating layer on the color filter, a surface coating layer is formed, and a color filter substrate consisting of a patterned transparent electrode and a counter substrate having an electrode pattern are fixed via a seal. . A color liquid crystal electro-optical element in which liquid crystal is injected and sealed, wherein the surface coating layer of the color filter substrate is not formed at least on the liquid crystal injection part of the seal.