Liquid crystal display device
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United States of America Patent
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-
Dec 14, 2004
Grant Date -
Jan 30, 2003
app pub date -
Jul 11, 2002
filing date -
Jul 27, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A liquid crystal display device is provided. An image memory (4) stores therein input pixel data (R.sub.in, B.sub.in, G.sub.in) on a frame-by-frame basis. Differencing circuits (23 to 25) calculate respective difference data ((R.sub.in -G.sub.pre), (B.sub.in -R.sub.in), (G.sub.in -B.sub.in)) on a pixel-by-pixel basis. Comparator circuits (27, 28, 29) output a pulse when the difference data is greater than a difference level (DLV). Counter memories (30 to 32) perform a counting operation each time the pulse is inputted thereto, and output respective counts (FLN_R, FLN_B, FLN_G) after the counting operation for one line. Comparator circuits (34 to 36) output a pulse to skip flag registers (37 to 39), respectively, when the respective counts are greater than a skip level. Skip flags (SPF_Ri, SPF_Bi, SPF_Gi) corresponding to a current line are set at '1.' A gate pulse for the line corresponding to the skip flags '1' is skipped. This reduces the write time of image data.
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