Display device and display system using the same

Details Display device and display system using the same Display device and display system using the same

1993-01-04

1995-07-25

Oberley, Alvin E.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 90, 345 96, 345 98, G09G 336

Patent

active

054366356

ABSTRACT:
Pixel electrodes and thin film transistors are arranged in a matrix in a display device, while polymer dispersion liquid crystals are interposed between an opposite electrode and the pixel electrodes on an electrode substrate. A signal is written into each pixel electrode by a pair of drive ICs for outputting signals in positive and negative polarities respectively with respect to an electrical potential at the opposite electrode. Two transistors are provided at each pixel electrode or an analog switch is provided at a signal output terminal of each drive IC so that signals of positive and negative polarities are not simultaneously written into an identical pixel electrode. When no voltage is applied to the pixel electrode, the incident light is reflected so as to be dispersed by the liquid crystal, and when a voltage is applied to the pixel electrode, the state of the liquid crystal is made light-permeable. The display device is used as a display panel to construct a viewfinder having a low electrical power consumption. The display device is also used as a light valve to construct a projection type television capable of displaying a magnified video picture on a screen with a high luminance.

REFERENCES:
patent: 4613207 (1986-09-01), Fergason
patent: 4936656 (1990-06-01), Yamashita et al.
patent: 4977456 (1990-12-01), Furuya
patent: 5117298 (1992-05-01), Hirai

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