| 摘要 |
PROBLEM TO BE SOLVED: To prevent the degradation of display characteristics caused by stripes occurring in division boundary positions even when increasing the number of degrees of freedom of display area selection for picture-in-picture or the like. SOLUTION: A source driver SD1 for main video screen and a source driver SD2 for superimposition or picture-in-picture share signal lines SL1 to SLn, and a control part 3 outputs video signal sampling start signals SSP1 and SSP2 to the source drivers SD1 and SD2 with a lag between them so that the signal line SLx (1<=x<=N) which the source driver SD1 has finished driving may be driven further by the source driver SD2. Therefore, the main video screen given by the source driver SD1 can be overwritten on a screen for superposition or picture-in-picture given by the source driver SD2. In this case, the source drivers SD1 and SD2 themselves are not divided so as not to generate stripes in division boundary positions on the display screen.
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