Dot-clock adjustment method and apparatus for a display...

Details Dot-clock adjustment method and apparatus for a display... Dot-clock adjustment method and apparatus for a display...

2005-08-02

2005-08-02

Wu, Xiao (Department: 2674)

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

C345S098000, C348S536000, C348S537000

Reexamination Certificate

active

06924796

ABSTRACT:
The frequency of the dot clock in an image display device is adjusted by calculating a first image characteristic from the differences between adjacent picture elements, varying the phase of the dot clock, determining whether the frequency of the dot clock is correct from the way the first image characteristic varies according to the phase of the dot clock, and changing the frequency if it is incorrect. The first image characteristic is, for example, the maximum difference, the histogram distribution of the differences, or a ratio calculated from the histogram. The phase of the dot clock may be adjusted according to a second image characteristic, such as the difference between a single pair of pixel values, which is also measured over a range of dot-clock phase settings.

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