Document Type and Number:
Japanese Patent JPS5078181
Kind Code:
U
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.
Application Number:
JP13442773U
Publication Date:
July 07, 1975
Filing Date:
November 20, 1973
Export Citation:
International Classes:
G02F1/133; G09G3/18; (IPC1-7): H05B37/00; G09F9/30; G02F1/13; G06K15/18