Horizontal shift clock pulse selecting circuit for driving a...

Details Horizontal shift clock pulse selecting circuit for driving a... Horizontal shift clock pulse selecting circuit for driving a...

2006-09-26

2006-09-26

Lefkowitz, Sumati (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

Reexamination Certificate

active

07113161

ABSTRACT:
An influence of a switching noise caused by a horizontal shift clock to an oscillation frequency of a voltage controlled oscillator should be eliminated, to prevent an image shift in a PAL skip period. For this purpose, an odd number line horizontal shift clock from an odd number line horizontal shift clock generator and an even number line horizontal shift clock from an even number line horizontal shift clock generator are switched by a horizontal shift clock switching circuit, to be input to a color LCD panel. The horizontal shift clock switching circuit selects and outputs either the odd number line horizontal shift clock or the even number line horizontal shift clock according to a line identifying signal, in a normal period. By contrast, in a PAL skip period a selecting state of the shift clock is inverted immediately upon start of a PAL skip period, from a selecting state right before the start of the skip period, and the selecting state is again inverted in half a cycle of a horizontal scanning period.

REFERENCES:
patent: 4364080 (1982-12-01), Vidovic
patent: 5963604 (1999-10-01), Greiss
patent: 6603450 (2003-08-01), Yamazaki et al.
patent: 2002/0176009 (2002-11-01), Johnson et al.
patent: 05037909 (1993-02-01), None

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