Patent ID: 7248254
Filing Date: 2007-07-24
Classification: G09G

Abstract:
1. A gamma correcting circuit comprising: a basic voltage generating circuit which has one end connected to a first high-potential power supply and the other end connected to a first low-potential power supply and generates and outputs a plurality of basic voltages by dividing a voltage difference between a voltage of said first high-potential power supply and a voltage of said first low-potential power supply; a gamma correction resistor circuit having a plurality of resistor elements connected in series between a second high-potential power supply and a second low-potential power supply, and gray-scale voltage output terminals and n (n being a positive integer >1) reference-voltage output terminal groups, both provided at respective nodes between said resistor elements, each of said n reference-voltage output terminal groups including a maximum of u (u being a positive integer >1) reference-voltage output terminal candidates; and a gamma correction adjusting circuit having n gamma characteristic adjusting units in association respectively with said n reference-voltage output terminal groups, each of said n gamma characteristic adjusting units selects one of a maximum v (v being a positive integer >1) basic voltages supplied from said basic voltage generating circuit as a reference voltage based on correction adjustment data and selects an output terminal for said selected reference voltage from said maximum of u reference-voltage output terminal candidates included in the associated one of said n reference-voltage output terminal groups based on said correction adjustment data, said gamma characteristic adjusting units each comprising: