Fujitsu Siemens Computers Gmbh

Paul Von Hase

Albertus Soemantri

A method and a device for correcting the phase between the pixel clock of a graphics card and the sampling clock of a flat-panel display with an analog interface in a system including a flat-panel display, graphics card, and computer. Automatic adjustment of the phase is performed repeatedly. In the process, the rising edge of a video pulse of a sufficiently bright image spot in the first image column close to the back-porch region is determined. The falling edge of a video pulse is determined at a sufficiently bright image spot in the last image column close to the front-porch region, and the phase is adjusted such that the sampling instant is situated approximately at the midpoint between the rising and falling edges of a video pulse.

Method and device for adjusting the phase for flat screens

The invention relates to a method and a device for matching the phase between the pixel clock of a graphics card and the sampling clock of a flat-panel display with an analog interface in a system comprising flat-panel display, graphics card and computer. Herein the rising edge of a video pulse of a sufficiently bright image spot in the first image column close to the back-porch region is determined. The falling edge of a video pulse at a sufficiently bright image spot in the last image column close to the front-porch region is determined, and the phase is adjusted such that the sampling instant is situated approximately at the midpoint between the rising and falling edges of a video pulse.

Method and device for compensating the phase for flat screens

A method for monitoring the setting of the phase between the pixel clock rate of a graphics card and the sampling clock rate of a flat screen having an analog interface includes the steps of setting a flag if the phase of the flat screen has been set by the user. The flag is interrogated upon switching on the flat screen and/or upon a change of the video mode at a computer and/or an exchange of the graphics card and/or upon an exchange of the computer. A display is provided or a setting of the phase is initiated if, during the interrogation, it is ascertained that the flag is not set. A device for monitoring the setting of the phase between the pixel clock rate of the graphics card and the sampling clock rate of the flat screen is also provided.

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Munich, Germany

Paul Von Hase