Liquid crystal apparatus

Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix

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345209, G09G 318

Patent

active

060467177

ABSTRACT:
A liquid crystal apparatus comprises scanning electrodes and data electrodes intersecting with each other to form a pixel at each intersection, and a ferroelectric liquid crystal disposed between the scanning electrodes and data electrodes. The apparatus includes a first unit for applying to the scanning electrodes at least two scanning selection signals in at least two vertical scanning periods; the scanning selection signals having mutually different waveforms and each having a pulse of one or the other voltage polarity with respect to the level of a voltage applied a scanning electrode when it is not selected; and a second unit for applying data pulses to the data electrodes in phase with said pulse of one or the other voltage polarity. The first unit and second unit in combination apply a fore voltage pulse to a pixel on a scanning electrode selected by application of the pulse of one or the other voltage polarity prior to each application of a writing voltage formed by combination of the pulse of one or the other polarity and an information pulse. 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.

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