Patent ID: 6226045
Filing Date: 2001-05-01
Classification: G09G,H03L,H04N

Abstract:
A digital display device having an apparatus for applying phase differences between red, green and blue signal transitions in analog video signals to a phase of a dot clock signal that has been regenerated from a horizontal synchronization signal in order to synchronize display of image data, said apparatus comprising:a differentiator for receiving the analog video signal and extracting signal transitions from the red, green and blue components of the video signal;a pulse shaper for eliminating amplitude variations in the signal transitions;a phase detector for detecting the phase measurements of the signal transitions between the red, green and blue components of the video signal, and for generating a sampling signal representative of phase differences of each of the signal transitions;a sample and hold means for converting the sampling signal from a first analog signal into a digital signal, and then converting the digital signal into a second analog signal after a preset time period;a phase shifter for combining said second analog signal with the horizontal synchronization signal to adjust the phase of the horizontal synchronization signal and generate a clock signal in phase with said signal transitions in the video signal, wherein said clock signal is used by the display device to synchronize display image data.