PROJECTION TYPE PICTURE DISPLAY UNIT, PROJECTION PICTURE DISPLAY METHOD, AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To configure a multi-screen in which brightness change between a picture duplicate area and an outside of the picture duplicate area is difficult to visually recognize from low gradation to high gradation.SOLUTION: An off-set correction value Doffset calculated by linearly reducing an off-set correction value at a minimum gradation so that the off-set correction value becomes 0 at a gradation larger than a predetermined gradation Lset in an input picture signal is added to the input picture signal.