Patent ID: 8228322

Claim:
A method of controlling halt and resumption of scanning actions of an LCD, comprising: monitoring an incoming video source to detect abnormality of the video source; recording current scan line position and corresponding polarity; stopping scanning of a panel of the LCD when the abnormality of the video source is detected, wherein the scan line for which the panel begins to stop scanning is defined as a halt scan line, its corresponding polarity is defined as a halt polarity, and its associated frame is defined as a halt frame; after a normal video source has been detected again, determining one or both of the following parameters: a resumptive scan line that has a position equal to that of the halt scan line with respect to a first pixel of respective frame; and a resumptive polarity such that a resumptive frame has the same polarity as the halt frame; and resuming the panel scanning on one or both of the following conditions: at the resumptive scan line; and when the polarity of the resumptive frame matches the polarity of the halt frame; wherein the panel scanning is stopped by de-asserting an output enable signal inputting to a scan driver of the LCD only when the abnormality of the video source is detected.