Circuit for driving a liquid crystal display panel

Details Circuit for driving a liquid crystal display panel Circuit for driving a liquid crystal display panel

1990-03-28

1992-10-20

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340793, 340811, G09G 336

Patent

active

051573865

ABSTRACT:
A circuit for driving an active matrix liquid crystal display having M rows and N columns by video digital data of K bits is provided. The rows and columns intersect at a plurality of thin film transistors which form at least in part a pixel at each intersection of a column and row. An analog switch capable of ON and OFF state receives a video voltage and a control signal and selectively outputs the video voltage to each column in response to a control signal. The video voltage varies in level sequentially increasing from the OFF state at least once each horizontal scanning period. A control receives the K bit digital input data and produces a control signal for controlling the time of the ON state of the analog switch in response to the input data. K is an integer at least equal to 1.

REFERENCES:
patent: 4180813 (1979-12-01), Yoneda
patent: 4427978 (1984-01-01), Williams
patent: 4427979 (1984-01-01), Clerc et al.
patent: 4488150 (1984-12-01), Kanatani
patent: 4743096 (1988-05-01), Wakai et al.
patent: 4766430 (1988-08-01), Gillete et al.
patent: 4859998 (1989-08-01), Kawamura et al.
patent: 5017914 (1991-05-01), Uchida et al.

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