Liquid crystal apparatus

Details Liquid crystal apparatus Liquid crystal apparatus

1988-03-04

1993-01-26

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

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

340805, 358236, G09G 336

Patent

active

051825490

ABSTRACT:
In a liquid crystal apparatus the scanning electrodes are applied with at least two scanning selection signals in at least two vertical scanning periods. The scanning selection signals comprise mutually different waveforms, each comprising a pulse of one or the opposite voltage polarity with respect to the level of a voltage applied to a scanning electrode when it is not selected. Data pulses are applied to the data electrodes in phase with the pulse. A writing voltage and a fore voltage are applied prior to the writing voltage formed by the combination of the pulse and a data voltage to a pixel on a scanning electrode during a selection period determined by application of the one or the opposite polarity to the scanning electrode. The fore voltage pulse has a polarity opposite to that of the writing voltage and an amplitude which is 1/2 or less of that of the writing voltage.

REFERENCES:
patent: 4635129 (1987-01-01), Togashi
patent: 4638310 (1987-01-01), Ayliffe
patent: 4655561 (1987-04-01), Kanbe et al.
patent: 4693563 (1987-09-01), Harada et al.
patent: 4701026 (1987-10-01), Yazaki et al.
patent: 4701799 (1987-10-01), Yoshimura
patent: 4711531 (1987-12-01), Masubuchi
patent: 4715688 (1987-12-01), Harada et al.
patent: 4725129 (1988-02-01), Kondo et al.
patent: 4770502 (1988-09-01), Kitazima
patent: 4800382 (1989-01-01), Okada et al.
patent: 4836656 (1989-06-01), Mouri et al.

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