Driving method for liquid crystal device

Details Driving method for liquid crystal device Driving method for liquid crystal device

1994-04-18

1996-07-02

Saras, Steven

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 95, 345210, G09G 336

Patent

active

055327133

ABSTRACT:
A liquid crystal device of the type comprising a pair of oppositely disposed electrode plates having thereon a group of scanning lines and a group of data lines, respectively, and a liquid crystal disposed between the pair of electrode plates so as to form a pixel at each intersection of the scanning lines and data lines, is driven by a driving method including the steps of applying a scanning selection voltage waveform including a scanning selection signal to a scanning line within one scanning period, and applying a data signal waveform to data lines within the one scanning period. The data signal waveform is composed to include (i) a data signal period for a data signal synchronized with the scanning selection signal and providing a time-integrated voltage of zero applied to an associate pixel within the period and (ii) an AC signal period for an AC signal providing a time-integrated voltage of zero applied to the associated pixel within the AC signal period. As a result, a pixel on a selected scanning line written in an optical state, particularly a halftone state, is not affected by data signals applied for writing in pixels on a subsequently selected scanning line regardless of a relaxation time exhibited by the liquid crystal at the time of switching thereof.

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