Method and apparatus for driving liquid crystal display unit

Details Method and apparatus for driving liquid crystal display unit Method and apparatus for driving liquid crystal display unit

1994-10-25

1995-07-04

Oberley, Alvin E.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345209, G09G 336

Patent

active

054304601

ABSTRACT:
A method for driving a liquid crystal display unit is arranged to apply positive-polarity signals to drains of thin film transistors of active matrix liquid crystal elements during an interval of a 1
field and to apply negative-polarity signals to the drains during an interval of a next 1
field. This method does not need to invert a common electrode voltage V.sub.com and a signal voltage V.sub.D at each scan period (1H). This contributes to easier design of a voltage-alternating circuit for V.sub.D or V.sub.com and reduces flicker resulting from the inversed voltage on an overall screen.

REFERENCES:
patent: 4591848 (1986-05-01), Morozumi et al.
patent: 4734692 (1988-03-01), Hosono et al.
patent: 4870399 (1989-09-01), Carlson
patent: 4922240 (1990-05-01), Duwaer

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