Patent ID: 6876358
Filing Date: 2005-04-05
Classification: G09G

Abstract:
1. A multi-sync display apparatus comprising: a pseudo synchronization signal generation means that, when input synchronization signals are within a predetermined phase difference, generates pseudo synchronization signals that are synchronized with the input synchronization signals, and that, when the input synchronization signals exceed a predetermined phase difference, generates pseudo synchronization signals having a frequency of a synchronization signal directly before the input synchronization signal that exceeds the predetermined phase difference; phase comparison means that performs phase comparison on the pseudo synchronization signals and the input synchronization signals, and outputs comparison result signals when the phase difference between the pseudo synchronization signals and the input synchronization signals exceeds a predetermined phase difference; and signal change determination means that, when the comparison result signals are continuously output for a plurality of times, outputs a signal change determination signal indicating that the input synchronization signals have changed.