Sync processor of flat panel display for determining signal...

Details Sync processor of flat panel display for determining signal... Sync processor of flat panel display for determining signal...

2005-10-04

2008-10-28

Hsia, Sherrie (Department: 2622)

Television

Synchronization

Automatic phase or frequency control

C348S547000, C348S521000

Reexamination Certificate

active

07443450

ABSTRACT:
In a sync processor for determining safety of signals on the basis of a horizontal/vertical sync signal generated according to a data enable signal, the sync processor includes a digital horizontal/vertical signal generator, a selector, a digital horizontal/vertical signal detector, a horizontal/vertical polarity determination unit, and a horizontal/vertical frequency determination unit. The digital horizontal/vertical signal generator generates a digital horizontal/vertical sync signal from the data enable signal. The digital horizontal/vertical signal detector detects a signal received from the selector and generates a digital horizontal/vertical signal. The horizontal/vertical polarity determination unit counts the number of low and high durations of a horizontal/vertical sync signal and generates a horizontal/vertical polarity signal in response. The horizontal/vertical frequency determination unit counts the number of cycles of the clock signal occurring in low and high durations of a digital horizontal/vertical polarity signal and generates a horizontal/vertical frequency signal in response.

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