JPH02170131A - Color liquid crystal display panel - Google Patents

Abstract

PURPOSE:To eliminate the breakdown of a panel seal part and to improve the durability by bringing an orienting film are a color filter side substrate into contact with each other not across an overcoat. CONSTITUTION:A color filter 2 is formed on a glass lower substrate 1 and thermosetting resin is printed thereupon and backed to form the overcoat 3, which covers the color filter 2. At this time, the coating area of the overcoat 3 is set slightly inside the area surrounded with a sealant 5. Then, the polyimide orienting film 4 is applied on the color filter side surface and baked. Then the sealant 5 made principally of thermosetting epoxy resin is printed at the peripheral part of the substrate in a specific shape and after spacers 6 are scattered over the entire surface, the glass upper substrate 11 is stuck and bonded by thermocompression. Thus, the orienting film 4 and the substrate on the side of the filter 2 are brought into direct contact with each other to obtain the structure of superior strength.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a color liquid crystal display panel having a built-in color filter.

[Prior Art] Conventionally, in a color liquid crystal display panel with a built-in color filter, the structure of the sealing part on the minus side of the color filter among two opposing substrates is described. It had a structure in which it was in contact with the surface through an alignment film.

[Problems to be Solved by the Invention] However, if the sealing part on the color filter side is t4N M as described above, the adhesion between the alignment film and the overcoat is extremely weak, so the liquid crystal during the panel assembly process is During vacuum injection, stress caused by a pressure difference between the inside and outside of the substrate causes damage to the sealing portion.

Therefore, in order to solve these conventional problems, the present invention provides a υ that can obtain sufficient adhesion strength in the seal portion.
The purpose of the present invention is to provide a color liquid crystal display panel having four structures.

[Means for Solving the Problems] In order to solve the above problems, the color liquid crystal display panel of the present invention has two substrates arranged facing each other with a liquid crystal phase in between, and one of the substrates is provided with an overcoat. In a color liquid crystal display panel having a structure in which a colored filter is provided on the inner surface of the substrate, and the peripheral portions of the two substrates are sealed with a sealant, the overcoat is applied by printing on the color filter, and the overcoat is applied on the color filter by printing. It is characterized in that the application area is limited to the inside of the area surrounded by the sealant.

[Function] In the seal portion on the color filter side configured as above, the alignment film and the color filter side substrate contact each other without an overcoat, so there is sufficient adhesion force at the interface between the two, equivalent to that of the opposing substrate. can be obtained, and breakage at the seal portion during the panel assembly process can be prevented.

[Actual/Stream Side] Examples of the present invention will be described below based on the drawings. In FIG. 1, a color filter 2 is placed on a glass lower substrate 1.
to form. On top of that, a thermosetting resin is applied by printing and fired to form an overcoat 6, and a color filter 2 is formed.
cover. At this time, the area to which the overcode 6 is applied is set to be slightly inside the area surrounded by the sealant.

A polyimide alignment film 4 is coated on the color filter sub-substrate that has undergone the above steps, and then baked. After that, a sealant 5 mainly made of thermosetting epoxy resin is printed around the substrate in a predetermined shape, and spacers 6 are spread over the entire surface, and then the glass substrate (counter substrate) 11 is bonded and thermocompression bonded. conduct. FIG. 2 shows the positional relationship between the overcoat 3 and the sealant 5 on the color filter side substrate in this state.

We also conducted a comparison with a conventional panel with a cost of 174 (Fig. 3) to determine whether the panel obtained in the above example can withstand the stress applied between the two substrates when liquid crystal is vacuum-injected. A test was conducted. The test is conducted using the following method.

After installing the panels according to the present invention (Samples 1 to 5) and those with conventional structures (Comparative Examples 1 to 6) in a vacuum chamber, the degree of vacuum was increased to 5°C using a rotary pump at a predetermined pumping speed.
Vacuuming was performed until Xi reached 0-3 torr.

Table 1 summarizes the presence or absence of breakage in the panel seal portion at this time.

Table 1 As is clear from Table 1, all panels with conventional structures (Comparative Examples 1 to 6) had a vacuum degree of 3 to 10 torr in the chamber.
Although breakage occurred at the seal portion near r, the samples of the present invention (samples 1 to 5) did not break at all and were able to sufficiently withstand the stress applied to the panel during liquid crystal injection.

[Effects of the Invention] As explained above, the color liquid crystal display panel of the present invention has a structure in which the alignment film and the color filter side substrate are in contact with each other at the sealing portion of the color filter side substrate without an overcoat. The adhesion strength in this area is greatly improved compared to conventional ones, and it is possible to solve the problem of breakage occurring at the panel seal part during vacuum injection of liquid crystal during the panel manufacturing process. Furthermore, as mentioned above, the color liquid crystal display panel of the present invention has excellent resistance to external stress due to its structure, so it has great effects such as dramatically improving durability in daily use. be.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a color liquid crystal display panel of the present invention. FIG. 2 is a plan view of the color liquid crystal display panel of the present invention on the glass lower substrate side (color filter side). Figure 6 is a cross-sectional view of a conventional color liquid crystal display panel.
...Glass lower substrate 2 ... Color filter 3 ...
・Overcoat 4.14...Alignment film 5...Sealant 6...Sceaser 7...Liquid crystal 1・・・・・・Glass top substrate 1・・・・・・More than liquid crystal injection port

Claims (1)

[Claims] Of the two substrates placed facing each other with the liquid crystal phase in between, one of the substrates has a structure in which a color filter with an overcoat is provided on the inner surface of the substrate, and the peripheral portions of the two substrates are sealed with a sealant. In a sealed color liquid crystal display panel, the overcoat is applied by printing onto the color filter, and the applied area is limited to the inside of the area surrounded by the sealant. display panel.