Brightness adjusting circuit of liquid crystal matrix panel for

Details Brightness adjusting circuit of liquid crystal matrix panel for Brightness adjusting circuit of liquid crystal matrix panel for

1980-02-08

1982-03-09

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340784, 350333, G09G 336

Patent

active

043192378

ABSTRACT:
A drive circuit drives a liquid crystal display device of the type in which liquid crystal fills a space between an X-Y matrix substrate having a number of picture elements each including a switching element, and a common electrode plate. The drive circuit provides an optimum picture displayed to an observer in accordance with ambient conditions such as light and temperature. To this end, a DC bias voltage to determine the operating point of the liquid crystal display device is applied to the common electrode. The brightness of the displayed picture may be controlled by adjusting the DC bias voltage. The DC bias is changed in accordance with a change in an amount of ambient light or ambient temperature. Furthermore, in accordance with the fall of the ambient temperature the DC voltage applied to the common electrode is made to oscillate at a frequency to which the liquid crystal is insensitive, with respect to the bias point. At this time, the amplitude of the oscillation is made large.

REFERENCES:
patent: 4040721 (1977-08-01), Kurita
patent: 4045791 (1977-08-01), Fukai et al.
patent: 4082430 (1978-04-01), Schulthess et al.
patent: 4233603 (1980-11-01), Castleberry
"Liquid Crystal Matrix Display" by Bernard J. Lechner et al., Proceedings of the IEEE, vol. 59, No. II, Nov. 1971, pp. 1566-1579.
"Liquid Crystal Video Display", Technical Staff Hughes Aircraft Co/IPD, Electro-Optical Systems Design, Sep. 1976, (3 pages).

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