Patent ID: 8284139

Claim:
A gamma voltage generator, comprising: an operation amplifier, having a first input terminal, a second input terminal, and an amplified output terminal, wherein the amplified output terminal generates an amplified output voltage; a first reference impedance unit, having one terminal for receiving a first gamma voltage and another terminal coupled to the first input terminal of the operation amplifier; a second reference impedance unit, having one terminal for receiving a second gamma voltage and another terminal coupled to the second input terminal of the operation amplifier; a first variable impedance unit, coupled between the first input terminal and the amplified output terminal of the operation amplifier, for providing a first variable impedance; a second variable impedance unit, coupled between the second input terminal of the operation amplifier and the terminal of the first reference impedance unit for receiving the first gamma voltage, for providing a second variable impedance; and a select unit, coupled to the operation amplifier, for selecting the amplified output voltage or the first gamma voltage according to a control signal to generate an interpolated gamma output voltage.