Liquid crystal display systems

Details Liquid crystal display systems Liquid crystal display systems

1980-05-28

1983-07-12

Curtis, Marshall M.

Communications: electrical

Continuously variable indicating

With meter reading

340719, 340784, 350334, G09G 336

Patent

active

043933807

ABSTRACT:
A matrix liquid crystal display circuit operates on a level of AC voltage equal to the voltage required for DC drive. The circuit includes a selecting transistor connected to the picture element and a capacitor for each picture element of the matrix. The capacitor in each row connects to a common electrode and the transistor gates in each row connect to a common electrode. The voltage level of the common capacitor electrode is shifted periodically relative to a reference voltage in order to invert the image signal polarity across the picture element and produce an AC drive. Inverted image signals of similar voltage level are alternately sampled.

REFERENCES:
patent: 3904924 (1975-09-01), Hilsum et al.
patent: 4233603 (1980-11-01), Castleberry
patent: 4239346 (1980-12-01), Lloyd

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