Method for driving a ferroelectric liquid crystal displays and b

Details Method for driving a ferroelectric liquid crystal displays and b Method for driving a ferroelectric liquid crystal displays and b

1993-01-14

1994-08-30

Hjerpe, Richard

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345210, G09G 336

Patent

active

053432177

ABSTRACT:
A ferroelectric liquid crystal display is supplied with voltages by STN driving IC's, and a bias voltage circuit for generating voltages supplied to bias pins of driving IC's is provided. The two composite voltages are supplied to liquid crystal cells during the pixel period and the kinds of composite voltage is five or six. In order to supply these composite voltages to the liquid crystal cells, control signal pins of STN driving IC's are supplied with a signal which is "high" during the first half of pixel period and "low" during the latter half of pixel period, and bias voltage pins are supplied with voltages which should be applied to common electrodes and segment electrodes. The circuit for generating bias voltages such voltages includes a plurality of resistors and two power supplies. Thus, the ferroelectric liquid crystal displays can be economically driven, and the flickering of a picture is decreased.

REFERENCES:
patent: 4728947 (1988-03-01), Ayliffe et al.
patent: 4769639 (1988-09-01), Kawanura et al.
patent: 4870398 (1989-09-01), Bos
patent: 5047757 (1991-09-01), Bone et al.

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