Method of driving liquid-crystal display
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United States of America Patent
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-
Jun 13, 2006
Grant Date -
Feb 5, 2004
app pub date -
Jul 31, 2003
filing date -
Aug 1, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A liquid-crystal display is driven by pulse-width modulation. One frame of an input video signal is divided into a plurality of subframes. A first pulse signal is applied to a liquid crystal irrespective of the level of the input video signal. A pulse width of the first pulse signal corresponds to the duration of the subframe. Application of the first pulse signal only does not drive the liquid crystal. A second pulse signal is applied to the liquid crystal in accordance with the level of the input video signal so that second pulses of the second pulse signal are superimposed on the first pulses at the same polarity, to perform pulse-width modulation to the liquid crystal. An average duration P of the subframes and a response time L obtained by adding a rise time and a fall time of the liquid crystal meet the requirements P
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