Device for driving a liquid crystal display device

Details Device for driving a liquid crystal display device Device for driving a liquid crystal display device

1992-02-24

1993-06-15

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340784, 340811, G09G 336

Patent

active

052203131

ABSTRACT:
A device for driving a liquid crystal display device, including, a segment signal output circuit for supplying segment signals to segment electrodes of the liquid crystal display device, a level of each of the segment signals being changed according to a level of corresponding one of data signals received by the segment signal output circuit, and a back plate signal output circuit for supplying a back plate signal having a predetermined level to back plate electrodes of the liquid crystal display device in succession. The segment signal output circuit is adapted to shift a level of each of the segment signals, for a short period of time at least shortly prior to change of level of corresponding one of the data signals, to such a value that electric charges charged up in a corresponding liquid crystal cell are discharged within the short period of time.

REFERENCES:
patent: 4737782 (1988-04-01), Fukuma et al.
patent: 4909607 (1990-03-01), Ross

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