Patent ID: 8253718
Filing Date: 2012-08-28
Classification: G09G

Abstract:
1. A power consumption reduction device comprising: a region-adaptive gray level conversion unit; wherein the gray level conversion unit is operable to convert n1 bits of gray level information for a low gray level region into m1 (<n1) bits of gray level information, further operable to convert n2 bits of gray level information for an intermediate gray level region into m2 (≦n2) bits of gray level information, and still further operable to convert n3 bits of gray level information for a high gray level region into m3 (<n3) bits of gray level information, and the gray level conversion unit converts a gray level of an input video signal so that m1≦m2, m3≦m2 and n1+n2+n3>m1+m2+m3 are all satisfied; a first power consumption calculation unit operable to calculate power consumption for an input video signal prior to gray level conversion; a second power consumption calculation unit operable to calculate power consumption for an input video signal following gray level conversion; and a peak brightness control unit operable to issue an instruction to increase the peak brightness level of a self-luminous display device so that power consumption following gray level conversion remains equal to or below power consumption prior to gray level conversion, wherein the peak brightness control unit determines a rate of increase in peak brightness level based on a value obtained by dividing power consumption prior to gray level conversion by power consumption following gray level conversion.