US 6,982,704 B2 | ||
Contrast adjusting circuitry and video display apparatus using same | ||
Hiroshi Aoki, Yokohama (Japan); Ryo Hasegawa, Yokohama (Japan); and Takaaki Matono, Yokohama (Japan) | ||
Assigned to Hitachi, Ltd., Tokyo (Japan) | ||
Filed on Nov. 15, 2002, as Appl. No. 10/295,033. | ||
Claims priority of application No. 2002-104383 (JP), filed on Apr. 05, 2002. | ||
Prior Publication US 2003/0189558 A1, Oct. 09, 2003 | ||
Int. Cl. G09G 5/00 (2006.01) |
U.S. Cl. 345—204 | 2 Claims |
1. A video display apparatus which converts analog video signals to digital video signals and displays video images, comprising:
a detection circuit configured to detect a maximum picture level and an average picture level of analog-to-digital converted
luminance signals for a predetermined period;
a control circuit configured to determine a first luminance region within which the detected maximum picture level falls,
and a second luminance region within which the average picture level falls, and to control the gain of analog luminance signals
before A/D conversion and/or digital luminance signals after A/D conversion, by feeding back the first luminance region data
and the second luminance region data, or by feeding back only the second luminance region data;
a black level extension circuit configured to perform black level extension processing, wherein, for input digital video signals
under a predetermined level at which the black level extension starts, the output level of the input digital video signals
is depressed, based on data of the detected average picture level;
a color matrix circuit configured to convert the color signals and the black level extended luminance signals into red, green,
and blue digital video signals, and to output the red, green, and blue digital video signals; and
a display unit configured to display video images reproduced from the digital video signals output from the color matrix circuit.
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