Patent ID: 6392642
Filing Date: 2002-05-21
Classification: G09G

Abstract:
A display device for displaying video frame signals transmitted from a signal source, the video frame signals comprising a plurality of vertical synchronization signals, horizontal synchronization signals and video signals, the display device comprising:a screen for displaying a video picture formed by a plurality of video signals; a displaying circuit for processing the video frame signals transmitted from the signal source and displaying the video signals on the screen, the displaying circuit comprising a frequency generator for generating pixel clocks for sampling the video signals; a first counter for counting the number of horizontal synchronization signals presented between two consecutive vertical synchronization signals when video signals are active, which equals to the number of horizontal scanning lines displayed on the screen; and a control circuit for adjusting the frequency of the pixel clocks generated by the frequency generator according to the number of horizontal scanning lines counted by the first counter so that the displaying circuit can correctly sample the video signals according to the pixel clocks generated by the frequency generator.