Method and apparatus for driving a liquid crystal display panel

Details Method and apparatus for driving a liquid crystal display panel Method and apparatus for driving a liquid crystal display panel

1991-01-16

1992-09-29

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340765, 340805, G09G 336

Patent

active

051516900

ABSTRACT:
A method and apparatus for driving a liquid crystal panel is disclosed, wherein the scanning electrodes are formed on one of two substrates between which a liquid crystal layer is interposed. Signal electrodes are formed on the other substrate. Scanning electrode voltage driving waveforms consisting of selective and non-selective voltages are applied to the scanning electrodes of the liquid crystal panel. Lighting and non-lighting voltage waveforms are applied to the signal electrodes of the liquid crystal panel. The polarity of the lighting and non-lighting voltages and selective and non-selective voltages of the scanning electrodes are inverted at predetermined periods to avoid any DC effect. A period is provided for in which the selective voltage is not applied to any scanning electrodes. During this unapplied period, a compensating voltage is applied to each signal electrode in accordance with the number of variations of voltages applied to the signal electrode with respect to the non-selective voltage applied to the scanning electrode during a preceding predetermined period.

REFERENCES:
patent: 4748444 (1988-05-01), Arai
patent: 5010326 (1991-04-01), Yamazaki et al.

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