Device for applying an A.C. voltage without D.C. component to a

Details Device for applying an A.C. voltage without D.C. component to a Device for applying an A.C. voltage without D.C. component to a

1974-11-15

1976-09-14

Curtis, Marshall M.

Communications: electrical

Systems

With specific power supply

340324M, 350160LC, G09F 932

Patent

active

039810046

ABSTRACT:
The present invention relates to an A.C. drive device for a liquid display panel in which liquid crystal layers are interposed between opposing segments across which an A.C. voltage is selectively applied to selectively drive the liquid crystal layers for displaying desired numerals, characters or the like. Clamp circuits are provided to prevent a D.C. voltage component from being applied to the liquid crystal layers when any selected character or numeric is to be displayed. This serves to extend the durability of the liquid crystal.

REFERENCES:
patent: 3532813 (1970-10-01), Lechner
patent: 3786485 (1974-01-01), Wojcik
patent: 3877017 (1975-04-01), Kawakami et al.

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