JPH0455302Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to improvement of a liquid crystal display element having a plurality of liquid crystal layers.

[Conventional technology]

This kind of conventional liquid crystal display element, for example, as shown in FIG. At the same time, the transparent conductive films 2 of the uppermost substrate 3 and the lowermost substrate 3' and the terminal portions of the intermediate substrate 3'' are electrically connected via an interconnector 6 formed by printing, dropping, etc. It is configured by connecting.

[Problem that the invention attempts to solve]

However, in the case of the above structure, since the interconnector 6 remains inside each liquid crystal cell, the terminal extraction part of each liquid crystal cell must be provided on the intermediate board 3'', and as a result, the connection to the circuit etc. on the circuit board is difficult. Furthermore, even if silver paste is used for the interconnector 6, it must be applied to the same number of substrate surfaces as the number of liquid crystal layers.
In addition to poor workability for processing, if a terminal extraction part is provided on the top or bottom board in the above structure, there will be parts other than the interconnector 6 between the other transparent conductive film and the terminal part. There is a problem in that the reliability of the conduction is low because of the presence of the metal. In addition, since each substrate 3 is made of a thick glass substrate with a thickness of 0.3 to 1.1 mm, there is a problem that parallax occurs when the viewing angle is tilted. To solve this problem, a thin glass substrate with a thickness of 0.1 mm is used. ,
The problem arises that it is easy to break and is not suitable for mass production.
Furthermore, by adopting a multilayer structure, it is possible to significantly improve the viewing angle dependence (the property that the display is visible or invisible depending on the viewing angle), which is a particular problem with a single layer structure, but since the substrate 3 is thick as described above, the liquid crystal display There is also the problem that the entire device becomes thicker.

In view of the above-mentioned problems, the present invention facilitates connection to circuits on circuit boards, improves workability related to interconnectors, and improves continuity reliability.
The object of the present invention is to provide a liquid crystal display element that is less likely to cause parallax, has good mass productivity, and has a thin overall liquid crystal display element.

[Means and actions for solving problems]

The liquid crystal display element according to the present invention uses a plastic film for the intermediate substrate, has a small hole in the intermediate substrate and its transparent conductive film, and connects the terminal portion of the uppermost or lowermost substrate to the interconnector penetrating the small hole. By electrically connecting the transparent conductive films of other substrates, the thickness of the intermediate substrate can be made thinner, and problems such as cracking will not occur even if this is done.
All the terminals of the liquid crystal cells can be taken out to the uppermost or lowermost substrate, and an interconnector can be formed that only requires coating one substrate surface with silver paste, etc., and all the transparent conductive films and terminal parts can be interconnected. This allows for direct electrical continuity only through the connector.

〔Example〕

Hereinafter, the present invention will be explained in detail based on the embodiment shown in FIG. 1, with the same reference numerals given to the same members as in the conventional example. The intermediate substrate is made of a thermoplastic plastic film (approximately 0.1 mm thick) such as ether sulfon) or PC (polycarbonate), and the intermediate substrate 7 and the transparent conductive film 1 provided on both sides thereof have small holes. The transparent conductive film 1 of the other substrates is electrically connected to the terminal portion of the uppermost substrate 3 or the lowermost substrate 3' by an interconnector 9 passing through the small hole 8. Incidentally, in order to make a small hole in the intermediate substrate 7 etc., the small hole portion may be removed with a punch, or the small hole may be formed by passing a needle through it.

The liquid crystal display element according to the present invention is constructed as described above, and since the intermediate substrate 7 is made of a plastic film, its thickness can be reduced to about 0.1 mm without causing problems such as cracking. Therefore, parallax is less likely to occur and at the same time, mass productivity is good.
Moreover, the entire liquid crystal display element becomes thinner. In addition, a small hole 8 is provided in the intermediate substrate 7, etc., and an interconnector 9 passing through the small hole 8 is used to connect the transparent conductive film 1 of the other substrates to the terminal portion of the uppermost substrate 3 or the lowermost substrate 3'.
Since the terminals of all the liquid crystal cells can be taken out to the uppermost substrate 3 or the lowermost substrate 3' if the patterns of the other substrates are shifted from each other, the circuits can be connected electrically. Connection to circuits etc. on the board becomes easy. Furthermore, for the same reason, the silver paste or the like is only applied to one substrate surface and is also applied to the other substrate surface through the small hole 8 to form the necessary interconnector 9, so the workability related to the interconnector 9 is improved. will improve. Further, for the same reason, all the transparent conductive films 1 and the terminal portions are directly electrically connected only through the interconnector 9, so that the reliability of electrical continuity is improved.

[Effect of idea]

As mentioned above, the liquid crystal display element according to the present invention can be easily connected to circuits on a circuit board, improves interconnector-related workability and continuity reliability, is less likely to cause parallax, and can be mass-produced. However, the liquid crystal display element has the important practical advantage that the entire liquid crystal display element is thin.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of a liquid crystal display element according to the present invention, and FIG. 2 is a sectional view of a conventional example. DESCRIPTION OF SYMBOLS 1...Transparent conductive film, 2...Alignment film, 3...Top substrate, 3'...Bottom substrate, 4...Sealing material, 5...
... Gap control material, 7 ... Intermediate board, 8
...small hole, 9...interconnector.

Claims (1)

[Scope of utility model registration request] In a liquid crystal display element having multiple liquid crystal layers,
A plastic film is used for the intermediate substrate, and a small hole is provided in the intermediate substrate and its transparent conductive film, and an interconnector penetrating the small hole allows the transparent conductive film of the other substrates to be connected to the terminal portion of the uppermost or lowermost substrate. A liquid crystal display element characterized by being electrically connected.