Contrast adjusting circuitry and video display apparatus...

Details Contrast adjusting circuitry and video display apparatus... Contrast adjusting circuitry and video display apparatus...

2006-01-03

2006-01-03

Shankar, Vijay (Department: 2673)

Computer graphics processing and selective visual display system

Display driving control circuitry

C345S205000, C345S211000, C345S212000, C345S213000

Reexamination Certificate

active

06982704

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-digital 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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