JPH0255334A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To reduce the manhour of production by forming different liquid crystal injection ports for upper and lower liquid crystal layers in a liquid crystal display device oppositely arranging three substrate and having the upper and lower liquid crystal layers. CONSTITUTION:Substrate 1C, 1B are combined and a displaying liquid crystal cell is formed through a sealing material 2A. Then, a substrate 1A is oppositely stuck to the substrate 1B of said cell through a sealing material 2B to form a compensating liquid crystal cell. Two injection ports are prepared for the liquid crystal display device and arranged on respectively different substrate end face sides. Even in the case of using different liquid crystal components for displaying and compensating, respective liquid crystal can be easily injected displaying liquid crystal 4A from the injection port 3A and then injecting compensating liquid crystal 4 from the injection port 3B.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a liquid crystal display device.

[Summary of the invention]

In recent years, liquid crystal display devices have been increasingly used in place of CRTs, and as a result, high time division driving has become required. As a liquid crystal display device that enables sufficiently high time division driving, there is a super twisted nematic type liquid crystal display device (hereinafter referred to as the STN type) in which the twist angle of the liquid crystal molecules is increased, but this display is heavily colored and has a poor appearance. bad. In order to eliminate the coloring and improve the appearance, a neutralized dry stead nematic liquid crystal display device (hereinafter referred to as NTN type), which has an optical compensation layer, was introduced. Since a liquid crystal cell is used as the
There are two more cards than N'4, which increases the weight and cost. Therefore, by sharing the substrate between the display liquid crystal layer and the compensation liquid crystal layer and using three substrates, it is possible to reduce the weight and manufacturing cost.

[Conventional technology]

As shown in Figure 2, in the conventional NTN type structure using three substrates, if the display liquid crystal 4A and the compensation liquid crystal 4B are different, first the substrates IB and IC are combined to form a display liquid crystal cell. After forming the display liquid crystal cell and filling it with liquid crystal, it is common to bond the substrate IB of the display liquid crystal cell and another substrate IA with a sealing material at a predetermined interval, and then seal the liquid crystal in the space. Met.

Furthermore, the injection port 3A of the display liquid crystal cell and the injection port 3B of the compensation liquid crystal cell are formed on the same side.

[Problem to be solved by the invention]

However, in the above-mentioned conventional technology, the assembly process of the liquid crystal cell is
This has the disadvantage that it has to be repeated several times and that it takes a lot of man-hours to construct the liquid crystal cell.

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and an object of the present invention is to provide a method that requires fewer manufacturing steps and can easily inject different liquid crystals into a display liquid crystal cell and a compensation liquid crystal cell.

[Means to solve the problem]

The liquid crystal display device of the present invention has three substrates disposed facing each other, a sealing material having an injection port between each substrate, an upper liquid crystal layer, and a formation position of the injection port. is different between the upper liquid crystal layer and the upper liquid crystal layer.

〔Example〕

Hereinafter, the present invention will be described in detail based on Examples.

FIG. 1 is a diagram showing an embodiment of the present invention.

The substrate IB serves as one side substrate of the display liquid crystal cell and one side substrate of the compensation liquid crystal cell. Therefore, alignment treatment films are formed on both sides of the substrate IB, and alignment treatment such as well-known rubbing is performed.

Further, one side of the substrate IC and the substrate IA (the side facing the substrate IB) is subjected to alignment treatment in the same manner as the substrate IB.

First, combine the substrate IC and the substrate IB, and
They are bonded together via A to form a display liquid crystal cell. Although not shown in FIG. 1, well-known transparent electrodes are formed in a matrix on the inner surface of the substrate of this display liquid crystal cell.
Any display is possible.

Next, a compensation liquid crystal cell is formed by bonding the substrate IA with the sealing material 2B in between so as to face the substrate IB of the display liquid crystal cell.

Next, a method for injecting different liquid crystals into the liquid crystal display device configured as described above will be described.

As is clear from FIG. 1, there are two injection ports in the liquid crystal display device of this embodiment, and they are arranged on different end surfaces of the substrates. That is, the injection port 3A in the figure is the injection port for the display liquid crystal cell, and the injection port 3B is the injection port for the compensation liquid crystal cell.

Therefore, by first injecting the display liquid crystal 4A from the injection port 3A, and then injecting the compensation liquid crystal 4B from the injection port 3B, it is possible to easily inject liquid crystals even when different liquid crystals are used for display and compensation. It became possible.

In this embodiment, the injection ports 3A and 3B are formed on opposite sides (right side and left side) as shown in FIG. The same effect can be obtained even if

〔Effect of the invention〕

As described above, according to the present invention, in a liquid crystal display device having a display liquid crystal layer and a compensation liquid crystal layer between three substrates, the formation positions of the injection ports of each liquid crystal layer are diagonal. With this structure, the number of manufacturing steps can be reduced, and different liquid crystals can be easily injected into the display liquid crystal cell and the compensation liquid crystal cell.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of a liquid crystal display device according to the present invention. FIG. 2 is a diagram showing the structure of a conventional liquid crystal display device. LA, IB, IC...board 2A, 2B...Seal material 3A, 3B... Inlet 4A...Display liquid crystal 4B...Compensation liquid crystal that's all Applicant: Seiko Epson Corporation

Claims (1)

[Claims] In a liquid crystal display device having three substrates disposed facing each other, a sealing material having an injection port between the substrates, and an upper liquid crystal layer and a lower liquid crystal layer, the formation position of the injection port is different from the upper liquid crystal layer. A liquid crystal display device characterized in that the lower liquid crystal layer is different.