Method and apparatus for driving liquid crystal display unit
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United States of America Patent
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Jul 4, 1995
Issued Date -
N/A
app pub date -
Oct 25, 1994
filing date -
Sep 17, 1991
priority date (Note) -
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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/n field and to apply negative-polarity signals to the drains during an interval of a next 1/n 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.
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