Driving circuit for liquid crystal electro-optical device

Details Driving circuit for liquid crystal electro-optical device Driving circuit for liquid crystal electro-optical device

1982-07-30

1985-12-24

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340805, 350333, G09G 336

Patent

active

045609829

ABSTRACT:
A liquid crystal display device having non-linear characteristics provides uniform quality in a matrix display. In driving rows and columns of picture elements the duty ratio is substantially increased by shortening the time in which the picture element is selected and charged for lighting. Charging time is less than the half frame period divided by the number of columns to be driven in the half frame, and more rows of elements can be driven in the half frame period. The portion of time actually used for charging is designated as a fine scanning period. By modulating the voltage levels across the liquid crystal layer during fine scanning periods when the crystal element is not selected, effective voltage across the picture elements is maintained with little variation regardless of the number of picture elements driven on the same signal line. A gray scale display can be provided.

REFERENCES:
patent: 3955187 (1976-05-01), Bigelow
patent: 3976362 (1976-08-01), Kawakami
patent: 4378557 (1983-03-01), Murata
patent: 4385294 (1983-05-01), Miles
patent: 4427978 (1984-01-01), Williams
patent: 4462027 (1984-07-01), Lloyd

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