Liquid crystal display and turn-off method therefor

Details Liquid crystal display and turn-off method therefor Liquid crystal display and turn-off method therefor

1996-07-01

1998-09-08

Saras, Steven J.

Computer graphics processing and selective visual display system

Plural physical display element control system

Segmented display elements

345 52, 345211, G09G 318

Patent

active

058051210

ABSTRACT:
In a liquid crystal display (16) having rows and columns of pixels (22), one or more selected rows of pixels are turned off (put in a standby mode) in a manner that saves power. A row of pixels is turned off by applying to the row a cyclical two-level voltage (BP2) having a magnitude that, when combined with voltages (FP3) applied to columns, results in each pixel in the selected row receiving a combined voltage (BP2-FP3) having a reduced number of transitions (30), having a magnitude that is insufficient to turn on a pixel, and having an average value of substantially zero over a cycle. The method is incorporated in a liquid crystal display apparatus (32) having a mode control (54) for switching selected rows of pixels between an active mode and a standby mode.

REFERENCES:
patent: 3976362 (1976-08-01), Kawakami
patent: 4527096 (1985-07-01), Kindlmann
patent: 4764766 (1988-08-01), Aoyama et al.
patent: 5218352 (1993-06-01), Endoh et al.
patent: 5218399 (1993-06-01), Izumi et al.

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