Method for driving a ferroelectric liquid crystal optical appara

Details Method for driving a ferroelectric liquid crystal optical appara Method for driving a ferroelectric liquid crystal optical appara

1988-05-09

1989-05-30

Miller, Stanley D.

Communications: electrical

Land vehicle alarms or indicators

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

350333, 340784, 340805, G02F 113

Patent

active

048345105

ABSTRACT:
The present invention realizes display of the intermediate tone by shortening the selection period of the one scanning line and setting a mean voltage level applied to the pixels to 0 by selectively applying the pulse, to the pixels, for initializing the ferroelectric liquid crystal to the saturated reverse response condition and the pulse superposing the high frequency AC pulse to the pulse having a mean voltage of 0 for such pulse and then applying the AC pulse which holds the response condition of ferroelectric liquid crystal while such pulse group is not applied to the pixels, and moreover by controlling a voltage value or duty (rate of the period for applying high frequency AC pulse and the period for not applying the pulse) of the high frequency AC pulse to be superposed to such pulse depending on the display tone.

REFERENCES:
patent: 4701026 (1987-10-01), Yazaki et al.
patent: 4715688 (1987-12-01), Harada et al.
patent: 4725129 (1988-02-01), Kondo et al.
patent: 4762400 (1988-08-01), Shimoda et al.
patent: 4765720 (1988-08-01), Toyono et al.
patent: 4770502 (1988-09-01), Kitazima et al.
patent: 4773738 (1988-09-01), Hayakawa et al.
patent: 4776676 (1988-10-01), Inoue et al.

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