Liquid crystal display device using signal converter of digital

Details Liquid crystal display device using signal converter of digital Liquid crystal display device using signal converter of digital

1977-07-26

1979-12-25

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

340800, 350333, 358241, G06K 1518

Patent

active

041808134

ABSTRACT:
A liquid crystal display device capable of displaying halftone pictures comprises a liquid crystal display panel in which liquid crystal picture elements are provided at the intersections of the m scanning electrodes and the n signal electrodes arranged in matrix configuration so as to be selectively lit up, a first liquid crystal drive circuit for selectively applying scanning voltages to the m scanning electrodes, a second liquid crystal drive circuit for applying brightness signal voltages to the n signal electrodes, wherein the signal converting circuit for supplying the n brightness signal voltages corresponding to the n signal electrodes to the second liquid crystal drive circuit in synchronism with the scanning voltages is simplified by constructing all the component circuits, except the A/D converter, in digital fashion so that it can be easily integrated and that every signal electrode need not be provided with a brightness control circuit.

REFERENCES:
patent: 3590156 (1971-06-01), Easton
patent: 3733435 (1973-05-01), Chodil et al.
patent: 3776615 (1973-12-01), Tsukamoto et al.
patent: 3838209 (1974-09-01), Tsuchiya et al.
patent: 3995939 (1976-12-01), Borel et al.
patent: 4024529 (1977-05-01), Sakai
patent: 4044345 (1977-08-01), Ueda et al.

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