Method and apparatus for displaying RGB and sync video without auxiliary frame storage memory.

摘要

Disclosed is a method and apparatus for supplying a video input to a liquid crystal display device (10). The input video is sampled and analyzed to determine the existing video format. The video is then conditioned to be compatible with the LCD display device (10). If the number of lines in the input video are substantially less than the number of display lines available in the LCD (10), an alternate frame display mode is enabled in which every other video frame is displayed such that the display frame rate is one half of the input video frame rate. The "latency" of the LCD display device (10) aids in avoiding any apparent flicker in the displayed video. If the number of lines in the input video is one half or less than the number of display lines available, the input video is supplied to a line buffer memory (38) which is read out to the LCD (10) at twice the video input line rate with the result that each line of the displayed video is a double scan of the input video to provide a more pleasing video image covering a greater portion of the LCD display panel. <IMAGE>