1988-09-22
1991-04-30
Miller, Stanley D.
350336, G02F 1133
Patent
active
050112660
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention concerns a liquid crystal display device in which polymer film substrates are extended from a display area outwardly to form electrode lead-out portions, an external circuit substrate is inserted between the electrode lead-out portions and the circuit substrate is electrically connected with an external driving circuit.
BACKGROUND ART
Generally, liquid crystal display devices have been utilized in various fields, for example, in office automation equipments or measuring instruments as display devices small in size, reduced in weight and of low electric power consumption. Among these liquid crystal display devices, while those liquid crystal display devices for displaying graphs or letters have a great number of picture elements, those with relatively small number of picture elements have been made into products or studied in recent years for utilizing liquid crystals as the device for controlling the amount of transmission light such as sun visors for use in automobiles, protection spectacles for welding, protection spectacles for laser beam, helmet shields for use in autobicycles, goggles for use in skiing or autobicycles or liquid crystal shutters for use in three-dimensional television sets. Furthermore, those devices having laminated liquid crystal panels have been made into products or studied, for example, liquid crystal protection spectacles for welding, liquid crystal protection spectacles for laser beams and liquid crystal shutters for use in three-dimensional television sets particularly requiring relatively low transmittance and high contrast.
In a conventional multi-layered liquid crystal display device of this type, one end (upper end) of a substrate is extended than the other to form an electrode lead-out portion and a transparent electrodes are formed to the electrode lead-out portion. The transparent electrodes on one side are collectively disposed at the upper end of the substrate for concentrating the electrodes for applying electric fields to the liquid crystal panels and the situation is the same for the other transparent electrodes, in which two-layered liquid crystal display panels prepared by laminating liquid crystal panels are formed. In such two-layered liquid crystal display panel, a connector corresponding to the thickness of the electrode lead-out portions is fitted and electric fields from an external driving circuit are applied to the liquid crystal panels respectively.
However, the conventional multi-layered liquid crystal display panel of this kind, since a polymer film is used as the substrate and electrodes are formed to the substrate to fit the connector, the transparent electrodes on the substrate made of polymer film are poor to the friction as compared with the liquid crystal panel made of glass, there is a problem that the connection reliability is low.
The present inventor has made an earnest study on such a problem and, as a result, has found an effective countermeasure therefor based on a plurality of inventions regarding the liquid crystal display device that the applicant of the present invention has previously proposed.
One of them is a liquid crystal optical device (refer to Japanese Patent Application No. Sho 61-303207), which intends to prevent the intrusion of obstacles in the precutting step to improve the yield by PF-LCD with less number of picture elements (LCD made of polymer film, PF-Liquid Crystal display), and in which electrodes on upper and lower substrates of an identical configuration are extended in one identical direction and an external circuit substrate is inserted between them. According to this system, the electrodes are highly resistive to friction upon insertion of connectors to improve the reliability in the connection when using the electrodes on external circuit substrates, for example, copper electrodes of FPC (plated with solder, gold, nickel, etc.). The other is a liquid crystal display device (Japanese Patent Application No. Sho 62-15779), which intends to prevent the disconnection of the e
REFERENCES:
patent: 4474432 (1984-10-01), Takamatsu et al.
patent: 4549174 (1985-10-01), Funada et al.
patent: 4772100 (1988-09-01), Suenaga
patent: 4896946 (1990-01-01), Suzuki et al.
Suzuki Takumi
Uehara Kiyohiro
Gross Anita Pellman
Miller Stanley D.
Ricoh & Company, Ltd.
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