Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1989-11-20
1991-05-21
Brier, Jeffery A.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340811, 340793, G09G 336
Patent
active
050179144
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, a discharge power supply voltage and a control signal and selectively outputs either the video voltage and the discharge power supply 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: 4488150 (1984-12-01), Kanatani
patent: 4743096 (1988-05-01), Wakai et al.
patent: 4766430 (1988-08-01), Gillette et al.
patent: 4859998 (1989-08-01), Kawamura et al.
Shida Fumio
Uchida Masahide
Brier Jeffery A.
Seiko Epson Corporation
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