| 摘要 |
PROBLEM TO BE SOLVED: To guarantee monotonic increase property of gamma correction characteristics of gradation voltage by ensuring monotonic increase of a gamma setting data, to eliminate such possibility that circuit elements constituting a DA converter 24 are broken by mismatch of the characteristics of the gradation voltage. SOLUTION: A gamma correction power supply circuit includes: a plurality of DA converters which generate the gamma correction voltage to determine the gamma correction characteristics of the gradation voltage which is input to a display device; a plurality of registers which are provided correspondingly to the plurality of converters, respectively, and which store the gamma setting data to determine the level of the gamma correction voltage in each corresponding DA converter; and a writing restriction circuit which determines whether, the gamma setting data which are input from an external device satisfies predetermined level relation to be satisfied for achieving the gamma correction characteristics, and which outputs the gamma setting data to the plurality of registers, only when the gamma setting data satisfy the predetermined level relation. COPYRIGHT: (C)2011,JPO&INPIT
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