Driving method to improve response time of twistred nematic and super twisted nematic LCDs without increasing GRAM
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United States of America Patent
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Issued Date -
Nov 13, 2008
app pub date -
May 8, 2007
filing date -
May 8, 2007
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Abandoned
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Abstract
A driving method to improve response time of twisted nematic (TN) and super twisted nematic (STN) passive matrix LCDs without increasing graphic memory (GRAM) adopts an over-driving operation principle to convert data of three primary colors to YCbCr data and over-driving YCbCr data. Then compressing, sampling and combining are performed through a video compression standard to further reduce a portion of storage bits of the YCbCr data and over-driving YCbCr data. Through an output frequency doubling circuit an over-driving compensation potential higher or lower than the original output potential is flexibly given N times according to the over-driving Y'Cb'Cr' data within the update time period of each data bus. Thereby the response time of the LCDs improves without increasing the GRAM and dynamic picture blurring phenomenon also improves.
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