JPS6325623A - Production of liquid crystal display device - Google Patents

Abstract

PURPOSE:To form a sealing material without thickening seal width in spite of a cell with a small cell gap and contacting a form plate with the surface of an orientation film by executing the letterpress printing of a prescribed pattern of the seal material for sealing liquid crystal by an elastic letterpress printing material. CONSTITUTION:The sealing material 12' is applied to a metal plate 11 on which many grooves 32 are engraved with 45-60 deg. angle to fill the grooves 32 uniformly with the sealing material 12', a roller 13 provided with the elastic letterpress printing material 14 is pressed to the material 12' while being rotated to transfer the sealing material 12' to the letterpress printing material 14 and then the sealing material 12' is transferred to the surface of a base 15. A projecting part 21 of the letterpress printing material 14 is part for transferring the sealing material 12' to the base 15 and a part other than the projecting part 21 is not contacted with the base surface. Thereby, influence to orientation is removed and seal thickness <=1mu can be available, so that a cell with a small gap can be prevented from the expansion of the seal more than required amount.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a liquid crystal display device, and more particularly to a method for manufacturing a liquid crystal display device in which a sealing material is formed by letterpress printing.

[Prior Art] Conventionally, in a method of manufacturing a liquid crystal display device, a sealing material is formed in a predetermined pattern on a substrate.

A process using screen printing is being carried out.

However, when forming a seal by screen printing, the amount of sealant printed on the substrate is large, and the cell gap is small (1 to 21
) had the disadvantage that the seal width was very thick and the display area was extremely small compared to the board area.

In addition, screen printing has the drawback that the screen printing plate comes into direct contact with the substrate surface, which often causes alignment defects such as scratches or adhesion of dirt to the alignment film.

[Problems to be Solved by the Invention] The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to eliminate the problems of the prior art such that the seal width does not increase even in cells with a small cell gap, and the plate does not touch the surface of the alignment film. It is an object of the present invention to provide a method for manufacturing a liquid crystal display device in which a sealing material can be formed.

[Means for Solving the Problems] That is, the present invention includes two electrode plates, a transparent conductive coating provided on one or both of the electrode plates, and the above two electrode plates.
In a method for manufacturing a liquid crystal display device comprising a sealing material sandwiched between two electrode plates and a liquid crystal sealed in a gap space formed by the electrode plates and the sealing material, the sealing material is made of an elastic letterpress material. , a method for manufacturing a liquid crystal display device, comprising a step of letterpress printing in a predetermined pattern.

In the present invention, the sealing material has no thixotropy,
Its viscosity is 10,000 cps or less, preferably 2,000 cps
It is desirable to use a material with ~5000 cps.

Further, specific examples of the sealing material include epoxy resin, silicone resin, nylon resin, and the like.

[Function] The method for manufacturing a liquid crystal display device of the present invention is to fill the concave pattern of a mold with a predetermined shape with a sealant, transfer the sealant to an elastic letterpress material, and then transfer the sealant onto a substrate. Since it is transferred and letterpress printed in a predetermined pattern, the sealant pattern formed on the substrate maintains the predetermined shape and line width, and the substrate can be attached without damaging the alignment film on the substrate. It is something that can be done.

[Example] Hereinafter, the present invention will be described in more detail based on the example shown in the drawings.

Example 1 FIGS. 1(a) to 1(d) are process diagrams showing a method of printing a sealing material in the present invention. First, a metal plate 11 is prepared in the process shown in FIG. 1(a). This board includes Figures 3(a) and (
As shown in Fig. 1(b), a large number of grooves 32 are cut at an angle of 45'' to 60°.Next, in the step of Fig. 1(b), the metal plate 11 is cut.
The sealing material 12 is evenly applied on the surface. The application method is to first drop the sealant onto the edge 31 of the metal plate If shown in FIG. 3(a), and then spread it uniformly in the direction of arrow B using a metal plate (not shown). Ta. In this way, the sealing material 12 can be uniformly filled into the groove 32 shown in cross section in FIG. 3(b). Next, an elastic letterpress material 1 is placed on the metal plate 11 coated with this sealant.
4 (for example, manufactured by Asahi Kasei Kogyo Co., Ltd., APR version) is rotated and pressed, the sealing material 12' is transferred onto the letterpress material 14, and as shown in FIG. 1(d), a transparent electrode pattern is formed. A seal is formed on the substrate by transferring the seal material 15 transferred by the letterpress material 14 onto the substrate 15 on which the seal is formed.

According to this method, even a thin film with an IJL of 1 or less can be easily formed, and by selecting a sealing material, it is also possible to form a film with a thickness of about 10H.

In this example, a non-thixotropic epoxy resin with a viscosity of 2,000 to 5,000 cps was used as the sealing material.
A thin film of ILm can be obtained.

In the above, a plan view of the relief material 14 used is shown in FIG. 2, and the portion other than the convex portion 21 where the sealing material is transferred to the substrate does not come into contact with the substrate surface. Therefore, by using such a relief printing plate, there is no influence on the orientation at all, and the disorder of orientation seen in screen printing does not occur.

[Effects of the Invention] As explained above, since the method for manufacturing a liquid crystal display device of the present invention prints a sealing material on a substrate using an elastic letterpress material, a thin film seal is formed, and therefore a cell gap is small. It is also possible to control the spread of the seal on the cell, making it possible to prevent it from spreading more than necessary.

Furthermore, since a letterpress printing plate is used, the printing plate does not come into contact with anything other than the necessary areas, so there is no adverse effect on orientation unlike in conventional screen printing.

[Brief explanation of drawings]

FIGS. 1(a) to (d) are process diagrams showing a printing method for a sealing material according to an embodiment of the present invention, FIG. 2 is a plan view of a letterpress material, and FIG. 3(a) is a plan view of a metal plate. Figure 3(b) is A
It is an A-line enlarged end view. 11... Metal plate 12. 12'... Seal material 13... Roller 14... Letterpress material 15...
Substrate 21...Convex part 31...End part
32... Mizo agent Norihiro Watanabe Figure 1

Claims (2)

[Claims] (1) Formed by two electrode plates, a transparent conductive coating provided on one or both of the electrode plates, a sealing material sandwiched between the two electrode plates, and the electrode plates and the sealing material. A method for manufacturing a liquid crystal display device comprising a liquid crystal sealed in a gap space in which the liquid crystal is sealed, the method comprising the step of letterpress printing the sealing material in a predetermined pattern using an elastic letterpress material. manufacturing method. (2) The method for manufacturing a liquid crystal display device according to claim 1, wherein the sealing material has no thixotropy and has a viscosity of 10,000 cps or less.