| 摘要 |
<P>PROBLEM TO BE SOLVED: To make the phenomenon that image information write to a memory and image information read from the memory pass each other hardly occur. <P>SOLUTION: An input signal processing part includes a dual port memory 21, an effective area determination part 22, a passing determination part 23, and a frame memory control part 24. Input image data is read out synchronously with a signal SCLK asynchronous with an inputted synchronizing signal (ICLK) by the dual port memory 21. The effective area determination part 22 detects an input period of image data to be displayed on a display part 9 and outputs a detection result as input effective information and input line information. The passing determination part 23 determines whether passing will occur with respect to image data read from an input frame memory or not in accordance with signals ICLK and SCLK, scaling factor information, and input determination threshold information and in consideration of a scaling factor. The frame memory control part 24 controls the input frame memory on the basis of signals SCLK and REQ, input effective information, input line information, and a passing determination result. <P>COPYRIGHT: (C)2007,JPO&INPIT |
