Patent ID: 7151537

Claim:
A method for correcting the phase difference between a pixel clock of a graphics card and a sampling clock of a flat-panel display with an analog interface in a system having a flat-panel display, a graphics card and a computer, comprising: determining an ideal phase difference between the pixel clock of the graphics card and the sampling clock of the flat panel display; and performing an automatic adjustment of the ideal phase difference repeatedly during continued operation of the display to compensate for phase drift during the continued operation of the display by providing an updated ideal phase difference; wherein an ideal phase difference adjustment necessary for an instantaneous condition of the system during continued operation of the display is determined only at individual image spots, and the determined ideal phase difference adjustment is then applied to the entire display as the display displays images; wherein said automatic adjustment of the ideal phase difference comprises selecting a sufficiently bright image spot and the rising edge of a video pulse of this image spot is determined, and the ideal phase difference is adjusted such that a sampling instant for an entire image is situated approximately at the midpoint between rising and falling edges of the video pulse.