Patent ID: 7973690

Claim:
A gamma voltage generation circuit, configured to generate a plurality of gamma voltages, the gamma voltage generation circuit comprising: an offset voltage generator, generating a first offset voltage by dividing a voltage difference between a first input voltage and a second input voltage based on a first code; a voltage level shifter, coupled to the offset voltage generator and comprising: a first voltage shifting circuit, coupled to the offset voltage generator, shifting down a first reference voltage by the first offset voltage to output a first level-shifted voltage; and a second voltage shifting circuit, coupled to the offset voltage generator, shifting down a second reference voltage by the first offset voltage to output a second level-shifted voltage; and a resistor string, comprising a plurality of resistors connected in series, each of the resistors outputting one of the gamma voltages, wherein a first end of the resistor string is coupled to an output terminal of the voltage level shifter, and a second end of the resistor string is coupled to an output terminal of the voltage level shifter; wherein the offset voltage generator comprises: a digital-to-analog converter, generating a first divided voltage by dividing the voltage difference between the first input voltage and the second input voltage according to the first code; and a first voltage divider, coupled to the digital-to-analog converter, dividing the first divided voltage to generate the first offset voltage.