| 摘要 |
A circuit for detecting an active video area for a display device, a method for detecting an active video area for a display device, and a coordinate mapping method using the detected active video area are provided. The circuit for detecting an active video area for a display device includes a comparison signal generator, a horizontal starting point detecting unit, a horizontal ending point detecting unit, a vertical starting point detecting unit, and a vertical ending point detecting unit. The method for mapping coordinates of a video source to coordinates of a display device includes (a) selecting a predetermined area of the video source, (b) generating a predetermined reference pattern, (c) transmitting R, G, and B signals in which the reference pattern is embedded, to the display device, (d) comparing the R, G, and B signals with a predetermined black level and outputting a comparison signal which indicates the existence of a video signal, (e) detecting a horizontal starting point, a horizontal ending point, a vertical starting point, and a vertical ending point using the comparison signal, and (f) converting the selected predetermined area of the video source into the counterpart area of the display device, using a predetermined mapping relationship and the detected horizontal starting point, the detected horizontal ending point, the detected vertical starting point, and the detected vertical ending point. Coordinates of the video source are thereby mapped to coordinates of the display device.
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