Patent ID: 7050028

Claim:
A reference voltage generation circuit which generates multi-valued reference voltages for generating a gray scale value corrected by gamma correction based on gray scale data, the reference voltage generation circuit comprising: a ladder resistor circuit including a plurality of resistor circuits connected in series, and outputting voltages of first to i-th division nodes (“i” is an integer larger than or equal to 2) as first to i-th reference voltages, the first to i-th division nodes being formed by dividing the ladder resistor circuit by the resistor circuits; a first switching circuit inserted between a first power source line supplied with a first power source voltage and one end of the ladder resistor circuit; and a second switching circuit inserted between a second power source line supplied with a second power source voltage and the other end of the ladder resistor circuit, wherein on/off state of the first and second switching circuits are controlled based on first and second switching control signals, and wherein the first and second switching control signals are generated based on an output enable signal and a latch pulse signal when all signal electrodes of a display panel are driven, the output enable signal controlling drive of a signal electrode, and the latch pulse signal indicating a timing of scan period.