Patent
1985-06-11
1987-10-20
Griffin, Donald A.
350350S, G02F 113
Patent
active
047010266
ABSTRACT:
A method and circuits for multiplex driving of a multielement liquid crystal display device having a ferroelectric liquid crystal therein. The method includes the step of applying at least one selecting electric field pulse having an amplitude which exceeds a threshold value of optical response of the ferroelectric liquid crystal to each element during a selecting term. It further includes the step of applying at least one non-selecting electric field pulse having an amplitude which is no greater than threshold value to each element at a time other than the selecting term. The optical response of the ferroelectric liquid crystal is determined in accordance with waveforms of the selecting and non-selecting pulses. According to the invention the duration of the non-selecting pulses is much smaller than the time between selecting terms. The width of the non-selecting pulses is minimized.
REFERENCES:
patent: 3891307 (1975-06-01), Tsukamoto et al.
patent: 3895372 (1975-07-01), Kaji et al.
patent: 3896430 (1975-07-01), Hatsukano
patent: 3902169 (1975-08-01), Washizuka
patent: 4367924 (1983-01-01), Clark et al.
patent: 4508429 (1985-04-01), Nagae et al.
Sato Yuzuru
Yazaki Minoru
Griffin Donald A.
Kaplan Blum
Seiko Epson Kabushiki Kaisha
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