Display device for displaying digital input image data using different filter segments for the lower and higher order bits
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United States of America Patent
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Jun 28, 2005
Grant Date -
N/A
app pub date -
Jan 12, 2000
filing date -
Mar 24, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
There is disclosed a display device using a color wheel having a color filter Cw, in addition to normal color filters corresponding to the three primary colors. The filter Cw has almost flat spectral transmission characteristics. Brightness information included in a color image signal is quantized with (n+m) bits. Information corresponding to the lower-order n bits is displayed by light transmitted through the filter Cw. Information corresponding to the upper-order n bits is displayed by light transmitted through the normal color filters. Only brightness information to which the human eye is visually sensitive is reproduced by the filter Cw having a lower transmissivity. This can eliminate a lack of the number of gray levels due to a constraint on the minimum switching speed of a light valve. Furthermore, the brightness little deteriorates.
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