Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-01-13
1994-08-23
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
361776, 359 83, G02F 11343
Patent
active
053412338
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to an ultrathin and ultralightweight liquid crystal module which can freely be bent without causing troubles such as wiring breaks, and which has a liquid crystal panel and a board that can be replaced easily.
2. Background Art
As shown in FIG. 16 of the accompanying drawings, one conventional liquid crystal panel comprises a liquid crystal 201 sandwiched between a pair of glass substrates 200. The liquid crystal panel also has a group of liquid crystal drive electrodes (not shown) disposed on each of the glass substrates 200. These liquid crystal drive electrodes are connected to liquid crystal driver LSI circuits 203 through a connection circuit network on a printed circuit board 202.
Since the conventional liquid crystal panel is composed of glass substrates and a relatively hard printed circuit board, the entire assembly has been inflexible, rigid, and flat.
Large-size liquid crystal panels which incorporate glass substrates are considerably heavy. Therefore, it is necessary to install such large-size liquid crystal panels stably so that they will not be deformed and will be resistant to vibrations. A lot of labor is required to assemble and maintain the large-size liquid crystal panels, resulting in a great total cost which has made the large-size liquid crystal panels impracticable and prevented them from finding wide use.
In recent years, there have been developed various liquid crystal panels which have flexible plastic substrates and hence are lightweight and can be flexed, providing curved surfaces (see Japanese patent publication No. 1-6084 and Japanese laid-open patent publication No. 1-91113) .
In such a liquid crystal panel with flexible plastic substrate, however, it is not possible to mount a printed-circuit board directly on a plastic substrate. It is therefore necessary to use a liquid crystal driver LSI circuit and an interconnection network as external circuits, around or independently separately from the liquid crystal panel. As a result, the liquid crystal display device incorporating the liquid crystal panel has large outer dimensions.
There is also known a liquid crystal display device including a liquid crystal panel that has flexible plastic substrates, and circuits such as a liquid crystal driver LSI circuit mounted on the reverse side of the liquid crystal panel through a reinforcing plate and a circuit board that can be bent to a certain extent.
With the known liquid crystal display device, configurations that the liquid crystal panel can take are governed by the rigidity and shape of the reinforcing plate and the circuit board which are disposed on the reverse side of the liquid crystal panel. Thus, the flexibility of the plastic substrates cannot fully be utilized, so that the liquid crystal display device displays desired information in a limited curvature range.
Another problem is that the weight and thickness of the liquid crystal panel are increased by the reinforcing plate and other components.
Since the circuit board and the liquid crystal driver LSI circuit are fixed to the liquid crystal panel, when the liquid crystal panel is deformed, stresses are developed in joints between terminals of liquid crystal driver electrodes on the plastic substrates and interconnections of the liquid crystal driver LSI circuit, tending to cause defects such as wiring breaks and peeling of the liquid crystal panel. In order to avoid such defects, the shape of the liquid crystal panel cannot be changed after it has been determined once.
The circuit board terminals and external input terminals are generally joined by soldering or the like. Therefore, when a defect occurs after the liquid crystal panel has been packaged, it is difficult to replace and reuse the liquid crystal panel and the circuit board, resulting in a reduced yield.
Prior liquid crystal display devices are designed such that a liquid crystal display unit is relatively large in size and an electronic circuit for driving the liquid crystal is as compact as possibl
REFERENCES:
patent: 4514042 (1985-04-01), Nujii et al.
patent: 4697885 (1987-10-01), Minowa et al.
patent: 4904065 (1990-02-01), Yuasa et al.
patent: 5029984 (1991-06-01), Adachi et al.
patent: 5044734 (1991-09-01), Sperl et al.
Patent Abstracts of Japan: vol. 13, No. 215 (p-874) May 19, 1989 & JP-A-01 132 231 (Seiko) Feb. 2, 1989*abstract*.
Patent Abstracts of Japan: vol. 14, No. 264 (p-1057) Jun. 7, 1990 & JP-A-02 073 219 (Idemitsu Kosan) Mar. 13, 1990 *abstract*.
Patent Abstracts of Japan: vol. 7, No. 60 (p-182) Mar. 12, 1983 & JP-A-57 205 711 (Richo) Dec. 16, 1982 *abstract*.
Kurosawa Moriyoshi
Tomoike Kazuhiro
Idemitsu Kosan Co. Ltd.
Parker Kenneth
Sikes William L.
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