Television – Image signal processing circuitry specific to television – Gray scale transformation
Reexamination Certificate
2006-09-05
2006-09-05
Yenke, Brian P. (Department: 2622)
Television
Image signal processing circuitry specific to television
Gray scale transformation
C348S649000, C348S678000, C348S687000, C348S703000, C345S589000, C345S604000, C345S617000, C345S690000
Reexamination Certificate
active
07102695
ABSTRACT:
A method and apparatus for selectively enhancing contrast depending on the level of incoming video signals while preserving colors are provided. An apparatus for enhancing the contrast and brightness of a video signal displayed on a display device includes: a first luminance level transformation circuit that receives luminance and chrominance signals, reduces the level of the luminance signal in response to a first control signal, and outputs the chrominance signals and the luminance signal whose level has been reduced; an image converting circuit that receives the output signals from the first luminance level transformation circuit and converts the received signals into RGB video signals; and a second luminance level transformation circuit that receives the RGB video signals from the image converting circuit, concurrently increases the respective levels of the RGB video signals in response to a second control signal, and outputs the RGB video signals whose levels have been increased. It is desirable that the display device is a color display tube (“CDT”), a thin film transistor liquid crystal display (“TFT-LCD”), or a plasma display panel (“PDP”).
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Han Yong-In
Huh Chang-Won
Kim Chang-Yeong
Lee Seong-Deok
Park Seok-Joon
F. Chau & Associates LLC
Yenke Brian P.
LandOfFree
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