DAP, LCD Device with a bias voltage

Details DAP, LCD Device with a bias voltage DAP, LCD Device with a bias voltage

1980-12-12

1983-10-25

Corbin, John K.

350332, G02F 1133, G02F 1137

Patent

active

044114966

ABSTRACT:
A liquid crystal color display device including a liquid crystal display cell having a Fredericksz transition effect, and a driving circuit for the display cell. At least one of the opposed electrodes of the liquid crystal display cell is divided into a plurality of electrode members aligned in a row, while the driving circuit supplies driving voltages to the plurality of electrode members corresponding to sound signals, the driving voltages being supplied sequentially having different levels in the order of alignment of the plurality of electrode members. The display device further includes a circuit for lowering the AC power source voltage to bias voltage or a predetermined low voltage level, the AC power source voltage being supplied to a common electrode member formed by the other opposed electrodes of the liquid crystal display cell the power-source voltage applying a potential difference to the liquid crystal, the potential difference being equal to the difference between the driving voltages and the predetermined low voltage.

REFERENCES:
patent: 3785721 (1974-01-01), Harsch et al.
patent: 4035060 (1977-07-01), Tsunoda et al.
patent: 4340277 (1982-07-01), Kaufman et al.
Sato et al., "Frequency Color Display by Nematic Liquid Crystals", Japan J. Appl. Phys., vol. 13, No. 3, 1974, pp. 559-560.

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