Computer graphics processing and selective visual display system – Display driving control circuitry
Reexamination Certificate
2011-03-15
2011-03-15
Dharia, Prabodh M (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
C345S205000, C345S211000, C345S213000, C345S209000, C345S207000
Reexamination Certificate
active
07907134
ABSTRACT:
With the aim of offering a video display technique by which stable and high contrast video images are reproduced, contrast adjusting circuitry is constructed. The contrast adjusting circuitry detects a maximum picture level (MPL) and an average picture level (APL) of analog -to-dialog converted luminance signals for a predetermined period, determines one of the predefined luminance regions within which the MPL falls and one of the predefined luminance regions within which the APL falls, and, based on the thus determined luminance regions of both MPL and APL, carries out a contrast adjustment of video images by changing the gain of luminance signals and color depth correction by changing the gain of color signals.
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Aoki Hiroshi
Hasegawa Ryo
Matono Takaaki
Dharia Prabodh M
Hitachi , Ltd.
McDermott Will & Emery LLP
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