JPH0451220A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent the generation of unequal display by forming conductive films respectively on the front surfaces on the side opposite from the liquid crystal of respective substrates and electrically connecting these conductive films to each other. CONSTITUTION:Transparent electrodes 23, 24 are deposited on the opposite inside surface of a pair of the transparent substrates 21, 22. Oriented films 25, 26 are formed across the surfaces of the electrodes 23, 24. The substrates 21, 22 are parted by spacers 27 consisting of an electrical insulating material and the liquid crystal 28 is sealed in the space thereof. The circumference is sealed by a sealing material 29. The transparent conductive films 30, 31 are respectively formed on the front surfaces of the substrates 21, 22 on the side opposite from the liquid crystal 28. The conductive films 30, 31 are electrically connected to each other by conductors 32 in a part on the outer peripheral edge of the substrates 21, 22. Polarizing plates 33, 34 are respectively formed on the conductive films 30, 31. An electrostatic shielding state is attained by the conductive films 30, 31 electrically connected to each other and, therefore, the local electrification and discharge are averted.

Description

[Detailed description of the invention] Industrial applications The present invention relates to improvements in liquid crystal display devices.

Conventional technology A typical prior art is shown in FIG.

A transparent electrode 34 is formed on a substrate 1.2 made of glass or the like to form a simple matrix, an alignment film 5.6 is formed thereon, and a liquid crystal 8 is formed in a space with a spacer 7 interposed therebetween. The substrates 1 and 2 are encapsulated and sealed with a sealing material 9, and polarizing plates 10 and 11 are provided on the outer surfaces of the substrates 1 and 2. The polarizing plate 10.11 has a laminated structure of electrically insulating films and has the property of being easily charged.In particular, the protective film was peeled off from the polarizing plate 10.11 and the protective film was peeled onto the substrate 1. It is well known that when the polarizing plates 10 and 11 are attached, a charge of several 100 to several 1000 V is generated. Furthermore, during the manufacture of liquid crystal display devices, there are many opportunities for static electricity to be generated during the alignment process, the polarizing plate attachment process, the polarizing plate protective film peeling process, the drive circuit connection process, and the like.

Problem to be Solved by the Invention When the polarizing plate 10.11 is charged with static electricity in this way, an electric double layer is formed, causing the substrate 1.2 in the liquid crystal display device to
There is also a charge between them, creating a potential difference.

When static electricity is charged inside the liquid crystal display device,
When the terminal portions of the transparent electrodes 3 and 4 come into contact with metal and discharge occurs, the transparent electrodes 3.
The charged state of the alignment films 5 and 6 and the spacer 7 located on the liquid crystal 4 changes locally, and the threshold voltage of the liquid crystal 8 changes locally. As a result, the transparent electrodes 3 and 4 became discharge paths.
So-called linear lighting unevenness occurs along the line, resulting in a significant deterioration of display quality.

An object of the present invention is to provide a liquid crystal display device that can prevent display unevenness from occurring.

Means for Solving the Problems The present invention provides a liquid crystal display device in which a liquid crystal is sealed between a pair of substrates, in which a conductive film is formed on the surface of each substrate opposite to the liquid crystal, and these conductive films are interconnected. This is a liquid crystal display device characterized in that it is electrically connected to.

Function According to the present invention, a conductive film is formed on the surface of each substrate opposite to the liquid crystal, and these conductive films are electrically connected to each other. An electrostatic shield state is created outside. Thereby, local charging and discharging of the liquid crystal display device can be avoided, and display unevenness can be prevented from occurring.

The present invention can be practiced in connection with a transmissive liquid crystal display, in which case the conductive film is transparent, and the invention can also be practiced in connection with a reflective liquid crystal display, in which case one of the conductive films is transparent. The conductive film may be a light-shielding conductive film made of aluminum or the like.

Embodiment FIG. 1 is a sectional view of an embodiment of the present invention. In a transmission type simple matrix liquid crystal display device, transparent electrodes 23 and 24 formed by vapor deposition or sputtering are deposited on opposing inner surfaces of a pair of substrates 21 and 22 made of transparent glass or synthetic resin. Alignment films 25 and 26 are formed over these transparent electrodes 23 and 24. The transparent electrodes 23,24 may for example consist of a material such as ITO (indium and tin oxide).

The substrates 21 and 22 include spacers 2 made of electrically insulating material.
7, and in that space, for example, T N (T
A twisted Ne+5atic) type liquid crystal 28 is sealed, and its surroundings are sealed with two sealants.

Transparent conductive films 30 and 31 are formed on the surfaces of the substrates 21 and 22 opposite to the liquid crystal 28, respectively.

This conductive film 31 may be made of, for example, the above-mentioned ITO, or alternatively polyethylene sulfide (abbreviated as PE).
5) It may have a structure in which an ITO conductive film is formed on a film, or it may have another structure.
A conductive film 30.31 is formed over the entire surface of the substrate 21.22.

At a portion of the outer periphery of the substrate 21.22, conductive films 30.31 are electrically connected to each other by a conductor 32. This conductor 32 may be made of conductive particles dispersed in a synthetic resin material, such as silver paste, for example. This conductor 32 may be made of not only silver paste, etc. The conductive film 30.3 may have a configuration of
1, polarizing plates 33 and 34 are respectively formed.

In this way, an electrostatic shielding state is achieved by the conductive films 30, 31 electrically connected to each other, so that local charging and discharging can be avoided, resulting in so-called linear lighting irregularities along the transparent electrodes 23, 24. The display quality can be improved without any trouble.

As another embodiment of the present invention, in a reflective liquid crystal display device,
A polarizing plate 34 is formed on the substrate 22, and on the polarizing plate 34 (
A conductive film made of a metal material such as aluminum is formed in the lower part of FIG. 1, and the other configurations are the same as those described above.

Effects of the Invention As described above, according to the present invention, a conductive film is formed on each surface of a pair of substrates sandwiching a liquid crystal on the side opposite to the liquid crystal, and these conductive films are electrically connected to each other. An electrostatic shielding state is achieved, thereby preventing local charging and discharging, preventing display unevenness, and improving display quality.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the present invention, and FIG. 2 is a sectional view of the prior art. 21.22...Substrate, 23.24...Transparent electrode, 28
...Liquid crystal, 30.31...Conductive film, 32...Conductor,
334...Polarizing plate

Claims (1)

[Claims] In a liquid crystal display device in which a liquid crystal is sealed between a pair of substrates, a conductive film is formed on the surface of each substrate opposite to the liquid crystal, and these conductive films are electrically connected to each other. A liquid crystal display device characterized by: