JPH04365009A - Liquid crystal device - Google Patents

Abstract

PURPOSE:To prevent the cross talk, afterimage and seizure of a liquid crystal device by connecting the orientation films on upper and lower substrates with a conducting material. CONSTITUTION:Electrode layers 12a, 12b and orientation thin films 13a, 13b are arranged on the surfaces of substrates 11a, 11b made o glass or plastic, and a pair of substrates 11a, 11b are arranged so that the orientation film faces are faced to each other. Periphery sections are stuck with sealing agents 14a, 14b, a liquid crystal 15 is sealed inside, and polarizing plates 16a, 16b are arranged on the outside. The surfaces of the orientation film layers 13a, 13b of the upper and lower substrates 11a, 11b are connected with a conducting material 17, i.e., the conducting material 17 is conducting grains dispersed in the sealing agents 14a, 14b. Electric charges accumulated on the surfaces of the orientation films on the upper and, lower substrates 11a, 11b are moved and removed, thus the cross talk, afterimage and seizure of a liquid crystal device are prevented.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to computer terminals,
The present invention relates to electro-optical devices using liquid crystals used in systems such as image display devices and shutters.

0002

[Prior Art] Conventionally, as shown in FIG.
is a substrate made of glass, plastic, etc., on the surface of which electrode layers 52a, 52b and alignment film layers 53a, 53b are provided. The pair of substrates are installed so that their alignment film surfaces face each other. 54a and 54b are sealing agents for sealing the liquid crystal, 55 is a liquid crystal material, and 56a and 56b are polarizing plates.

As a conventional method for forming an alignment film for a liquid crystal device, a method is known in which a polyimide polymer resin is applied onto a substrate and then rubbed in a certain direction with a cloth or the like. For example, such a structure is disclosed in Japanese Unexamined Patent Publication No. 143525/1983.

0004

[Problems to be Solved by the Invention] However, in conventional liquid crystal devices, due to the difference in resistance value depending on the width and length of the electrode layers on the upper and lower substrates, and the difference in the thickness of the alignment film layer, There is a problem in that the amount of charge charged on each panel differs, and this causes crosstalk, image retention, and burn-in phenomena in liquid crystal devices. Particularly when a polymer is used as the material for the alignment film layer, the influence of the electrical charge is significant.

There would be no problem if an electrically symmetrical circuit could be formed between the upper and lower substrates, but it was actually impossible to achieve symmetry including wiring resistance. Therefore, the purpose of the present invention is to solve these conventional problems by focusing on the fact that the surface of the alignment film layer has some conductivity due to adhesion of moisture, etc. It is an object of the present invention to provide a liquid crystal device which eliminates the influence of undesired electric charges.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the present invention involves sandwiching a liquid crystal between a pair of substrates each having a transparent electrode on the substrate and an alignment film on the electrode, and applying a sealant to the outer periphery of the liquid crystal. In the bonded liquid crystal device, alignment films formed on the upper and lower substrates were connected by a conductive material.

[0007]

[Operation] In the liquid crystal device configured as above,
Since the surfaces of the alignment film layers on the upper and lower substrates are connected, undesired charges accumulated on the surfaces are moved and removed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal cross-sectional view of a liquid crystal device according to the present invention. In FIG. 1, 11a and 11b are substrates made of glass, plastic, etc., with electrode layers 12a and 12b on the surface.
Alignment film layers 13a and 13b are provided. The pair of substrates are installed so that their alignment film surfaces face each other. 14a,
14b is a sealant for sealing liquid crystal, 15 is a liquid crystal material, and 16a and 16b are polarizing plates. Reference numeral 17 is a conductive material that connects the surfaces of the alignment film layers on the upper and lower substrates.

Carbon particles were used as the conductive material. FIG. 2 is a plan view of a liquid crystal device according to the present invention. In FIG. 2, 21a and 21b are substrates, 22a is an alignment film on the substrate 21a, and 22b is a range of the alignment film on the substrate 21b. 23 is a sealant. 24 is a conductive material for connecting the upper and lower alignment film layers. As shown in FIG. 2, since the upper and lower electrodes do not overlap at the sealant portion, the electrodes on the upper and lower substrates will not be short-circuited by the conductive substance added to the sealant.

In the liquid crystal device formed in this manner, burn-in of the liquid crystal device is reduced. There is no problem with the amount of conductive particles added as long as the amount does not cause short-circuits between electrode patterns on the same substrate. Further, although carbon particles were used as the material for connecting the alignment film layers, the same effect can be obtained using a conductive material. Next, another embodiment will be described in which the alignment film layers on the upper and lower substrates are connected. FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention.

In FIG. 3, 31a and 31b are glass;
A substrate made of plastic or the like, with an electrode layer 32a on the surface,
32b, and alignment film layers 33a and 33b are provided. The pair of substrates are installed so that their alignment film surfaces face each other. 34a and 34b are sealants for sealing the liquid crystal;
35 is a liquid crystal material, and 36a and 36b are polarizing plates. 37
A and 37b are electrically conductive substances that connect the surfaces of the alignment film layers on the upper and lower substrates. Silver paste was used as the conductive substance. FIG. 4 is a plan view of FIG. 3.

In FIG. 4, 41a and 41b are substrates;
4a indicates the alignment film on the substrate 41a, and 44b indicates the range of the alignment film on the substrate 41b. 45 is a sealant. 46
is a conductive material for connecting the upper and lower alignment film layers. 42 and 43 are electrodes on 41a and 41b, respectively. As shown in FIG. 4, the upper and lower alignment film layers were connected at a position where the upper and lower electrodes would not short-circuit.

In the liquid crystal device formed as described above, burn-in of the liquid crystal device is reduced. In this embodiment, a polyimide-based alignment film material is used, but the same effect can be obtained regardless of the type of material used as long as the alignment film functions as an insulating film layer between the liquid crystal layer and the electrode layer. Further, although silver paste was used as the material for connecting the alignment film layers, the same effect can be obtained using a conductive material.

[0014]

Effects of the Invention As explained above, the present invention provides a liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates each having a transparent electrode on the substrate and an alignment film on the electrode, and the outer periphery of the substrate is bonded with a sealant. In this method, since the alignment films formed on the upper and lower substrates are connected by a conductive material, the charges accumulated on the surfaces of the alignment films on the upper and lower substrates are moved and removed, thereby reducing crosstalk in the liquid crystal device. It has the effect of eliminating afterimages and burn-in.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a cross section of a liquid crystal device of the present invention.

FIG. 2 is an explanatory diagram showing the configuration of a liquid crystal device of the present invention.

FIG. 3 is an explanatory diagram showing a cross section of a liquid crystal device of the present invention.

FIG. 4 is an explanatory diagram showing the configuration of a liquid crystal device of the present invention.

FIG. 5 is an explanatory diagram showing a cross section of a conventional liquid crystal device.

[Explanation of symbols]

11a, 11b board 12a, 12b electrode layer 13a, 13b alignment film layer 14a, 14b Sealant 15 Liquid crystal material 16a, 16b Polarizing plate 17 Conductive substances

Claims (2)

[Claims] 1. In a liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates each having a transparent electrode on the substrate and an alignment film on the electrode, and the outer periphery of the substrate is adhered with a sealant, the liquid crystal device is formed on the upper and lower substrates. A liquid crystal device characterized in that alignment films are connected by a conductive material. 2. The liquid crystal display element according to claim 1, wherein the conductive substance is conductive particles dispersed in a sealant.