Computer graphics processing and selective visual display system – Display driving control circuitry – Intensity or color driving control
Reexamination Certificate
2005-03-18
2008-11-18
Tran, Henry N (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
Intensity or color driving control
C345S088000, C345S589000, C345S600000, C348S744000, C348S750000, C348S751000, C353S031000, C353S034000, C353S073000, C359S237000, C359S245000, C359S276000
Reexamination Certificate
active
07453475
ABSTRACT:
Exemplary embodiments of the invention provide an optical display device that modulates light from a light source in two stages through an optical modulator and a luminance adjusting element to expand the luminance dynamic range and the number of the gradation levels of a display image, that allows the picture quality to be enhanced, and that is suitably applied to display an image according to the resolution of the luminance adjusting element having a higher resolution than the optical modulator. Exemplary embodiments provide a projection type display device that converts RGB pixel values in HDR display data into YCbCr pixel values, selects the maximum Ymaxfrom corresponding YCbCr values on a pixel-basis in a color modulation light valve, and calculates average values Cbaveand Crave. The device converts YCbCr pixel values consisting of these values into RGB pixel values, determines the transmittance T1of each of the pixels in the color modulation light valve using the RGB value, then determines the transmittance T2of each of the pixels in the luminance modulation light valve based on the transmittance T1, and determines control values for the light valves based on the values T1and T2.
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Asahi Tsunemori
Nakamura Jun-ichi
Nitta Takashi
Uchiyama Shoichi
Oliff & Berridg,e PLC
Seiko Epson Corporation
Tran Henry N
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