Voltage generating circuit for driving liquid crystal display de

Details Voltage generating circuit for driving liquid crystal display de Voltage generating circuit for driving liquid crystal display de

1990-12-21

1993-07-20

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

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

340811, 359 55, G09G 336

Patent

active

052297616

ABSTRACT:
A voltage generating circuit generates voltages of various voltage levels for driving a liquid crystal display device. A first voltage source generates first voltage for driving a liquid crystal device while there is provided a first switched capacitor circuit which inverts the first voltage in polarity to generate second voltage for driving a liquid crystal display device, and a second voltage source generates third voltage for driving the display device while there is provided a second switched capacitor circuit which inverts the third voltage in polarity to generate fourth voltage for driving the display device. Further, the first switched capacitor circuit is integrated together with a liquid-crystal driving circuit which selectively outputs the first and second liquid crystal driving voltage while the second switched capacitor circuit is integrated together with a liquid crystal driving circuit which selectively outputs the third and fourth liquid-crystal driving voltage.

REFERENCES:
patent: 3955353 (1976-05-01), Astle
patent: 4168498 (1979-09-01), Kubota et al.
patent: 4769639 (1988-09-01), Kawamura et al.
patent: 4860311 (1989-08-01), Storberg
patent: 4866297 (1989-09-01), Matsumoto
patent: 4929848 (1990-05-01), Gulczynski
patent: 4965566 (1990-10-01), Kawamura et al.

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