Patent ID: 7663646

Claim:
A method for realizing on-screen display (OSD), implemented in a device capable of showing OSD that comprises a video signal receiver, an OSD signal receiver, and an output control unit, comprising: retrieving by the video signal receiver a first presenting part of video signals to be viewable on a display of the device capable of showing OSD and a second presenting part of said video signals other than said first part, wherein the first presenting part and the second presenting part of said video signals comprise three essential color space elements of the video signals; retrieving by the OSD signal receiver a second presenting part of on-screen-display (OSD) signals corresponding to said second part of said video signals, wherein a first presenting part and the second presenting part of said OSD signals comprise three essential color space elements of the OSD signals; selectively transmitting by the output control unit said retrieved second part of said video signals or said retrieved second part of said OSD signals for display; and displaying by the device capable of showing OSD a set of combinative viewable signals on said display by preparing first and second presenting parts of the set of combinative viewable signals respectively from said retrieved first part of said video signals and said selectively-transmitted second part of one of said video signals and said OSD signals, wherein said retrieved first part of said video signals, said retrieved second part of said video signals and said retrieved second part of said OSD signals are respectively stored in three different buffers before further processing.