Patent ID: 6967688

Claim:
An apparatus for reducing noise effects associated with the vertical position of an on screen display (OSD) image for a display device that uses a vertical flyback signal and a horizontal flyback signal in producing an image, comprising: a clock signal generator that is configured to produce multiple horizontal clock signals in response to the horizontal flyback signal, wherein each multiple horizontal clock signal has a different phase with respect to one another; a phase selection circuit that is configured to select one of the multiple horizontal clock signals such that an edge associated with the selected multiple horizontal clock signal is non-coincident with an edge associated with the vertical flyback signal; and a blanking circuit that is configured produce a blanking signal in response to the selected multiple horizontal clock signal such that the blanking signal determines the vertical position of the OSD image, whereby noise effects associated with at least one of the vertical flyback signal and the horizontal flyback signal are minimized.