Patent ID: 8698720
Filing Date: 2014-04-15
Classification: G09G

Abstract:
1. A display signal processing device comprising: a reference gradation voltage generating circuit that generates a first predetermined number of reference gradation voltages; a source drive comprising a digital-to-analog converting circuit that converts a display signal to a pixel voltage by selectively using the first predetermined number of reference gradation voltages from said reference gradation voltage generating circuit; and a control section that controls said source drive and said reference gradation voltage generating circuit, wherein said reference gradation voltage generating circuit includes a resistance circuit comprising a plurality of resistors connected in series, and a second predetermined number of variable voltage generating sections connected to both ends of said resistance circuit and to a predetermined connecting section of connecting sections of the plurality of resistors, the second predetermined number being less than the first predetermined number, said second predetermined number of variable voltage generating sections comprises a digital-to-analog converter that converts a plurality of numeral data supplied from said control section into output voltages which are each varied for gamma correction, and supplies the output voltages to said resistance circuit, and difference voltages between output terminals of said variable voltage generating sections are divided by said resistance circuit and the first predetermined number of reference gradation voltages are derived.