JPH01145631A - Production of liquid crystal panel - Google Patents

Abstract

PURPOSE:To enable the provision of connecting terminals to only one substrate via a conductive material interposed between two sheets of substrates even if the spacing between the substrates is extremely thin by joining two sheets of the substrates subjected to an orientation treatment at a specified spacing, then sealing the conductive material between two sheets of the substrates. CONSTITUTION:An epoxy resin is screen-printed on one of the substrates 1, 2 to form an outside circumferential seal and thereafter, about 2mum spacer particles are dispersed and disposed therebetween. Two sheets of such substrates are so disposed that the transparent electrode A part of a 1st substrate 1 and the transparent electrode (a) part of the 2nd substrate 2 face each other. The substrates are then pressurized under heating and are joined at about 2mum specified spacing. A liquid crystal is sealed between the substrates enclosed by a sealing agent. The conductive material is thereafter sealed between the electrodes. Namely, electrical conduction is obtd. After two sheets of the substrates are joined and, therefore, the liquid crystal panel which is provided with the connecting terminals only on one substrate and has the thin spacing between the substrates is easily produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a liquid crystal panel used for an electro-optical shutter or the like. In particular, the present invention relates to a method for establishing electrical continuity between the upper and lower substrates of a liquid crystal panel in which connection terminals for an external drive device are provided on only one substrate.

[Summary of the invention]

In a liquid crystal panel in which connection terminals for an external drive device are provided on only one substrate, two substrates are bonded at a certain distance, and then a conductive material is sealed in the space between the two substrates.
Establish continuity between the upper and lower boards.

[Conventional technology]

A liquid crystal panel is made up of two substrates that are bonded at a certain distance. There are two methods: one method is to provide a connecting terminal on each of the two substrates, and the other method is to provide a connecting terminal only on one substrate with a conductive material interposed between the two substrates.

-The latter method is often used due to the ease of connection, and most liquid crystal display panels for digital watches use this method.

By the way, conventionally, in order to provide a connection terminal on only one substrate, a method has been used in which one substrate is coated with a conductive substance and then the two substrates are bonded to establish electrical continuity between the substrates.

[Problem that the invention seeks to solve]

In reality, screen printing is used as a method of applying a conductive material to one of the substrates, and the height of the conductive material after printing is several tens of micrometers. Moreover, since the conductive material contains a large amount of inorganic material such as silver, it is quite difficult to compress the conductive material to a spacing of about 10 μm, which is generally required for liquid crystal panels. Furthermore, recently published high-speed response optical shunters using nematic liquid crystals, ferroelectric liquid crystal display panels, etc. require a substrate spacing of several μm, making conventional methods completely unusable.

[Means for solving problems]

The manufacturing method of the present invention solves the above problems,
The method is characterized in that two substrates that have been subjected to orientation treatment are bonded with a certain distance between them, and then a conductive substance is sealed in the space between the two substrates to establish electrical continuity between the substrates.

[Effect]

In this way, since conduction is established after the two substrates are bonded, it is possible to easily manufacture a liquid crystal panel in which connection terminals are provided only on one substrate and the distance between the substrates is several μm.

[Example] After providing transparent electrodes A, B, and a as shown in FIGS. 1 and 2 on two glass substrates 1.2, an alignment film made of a polyimide film is formed and rubbed. After forming an outer peripheral seal 3 on one side of the substrate 1.2 by screen printing an epoxy resin, spacer particles of about 2 μm are dispersed.

These two substrates are arranged so that the transparent electrode A portion of the first substrate 1 and the transparent electrode A portion of the second substrate 2 face each other, and are heated and pressurized to form a constant interval of approximately 2 μm. The liquid crystal is sealed between the substrates surrounded by the sealant 3 (FIGS. 3 and 4).

After this, A of the facing first substrate l and the second substrate 2
A conductive substance C made of silver paste diluted with butyl acetate is sealed between a. Now the transparent electrode a on the second substrate 2
and the first transparent electrode terminal A are established, and the first substrate 1
It was possible to drive the device by connecting it to the external drive vtT1 using the A and B portions as connection terminals.

(Effects of the Invention) According to the present invention, even when the substrate spacing is extremely thin, such as about 2 μm, a connecting terminal can be provided only on the - side of the substrate by interposing a conductive substance between the two substrates, and the effect is significant. It is.

[Brief explanation of the drawing]

Figure 1 is a layout diagram of transparent electrodes on the first substrate, and Figure 2 is a diagram of the arrangement of transparent electrodes on the first substrate.
The transparent electrode arrangement TtyA on the substrate shown in FIG. -fV line sectional view. Applicant: Seiko Electronic Industries Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In a liquid crystal panel in which connection terminals for an external drive device are provided on only one substrate, two substrates that have been subjected to alignment treatment are bonded at a certain distance, and then a conductive material is placed between the two substrates. A method for manufacturing a liquid crystal panel characterized by enclosing the upper and lower substrates and establishing conduction between the upper and lower substrates.