Patent ID: 8610658

Claim:
An apparatus comprising: a first reference voltage generator having a first group of gamma correction buffer circuits and digital-to-analog converters (DACs), each gamma correction buffer circuit of the first group having an input coupled to an output of a corresponding DAC of the first group, respectively, and an output coupled by a corresponding output conductor, respectively, to a corresponding tap point of a first resistor string; a second reference voltage generator having a second group of gamma correction buffer circuits and DACs, each gamma correction buffer circuit of the second group having an input coupled to an output of a corresponding DAC of the second group, respectively, and an output coupled by a corresponding output conductor, respectively, to a corresponding tap point of a second resistor string, the gamma curve correction circuitry being coupled to receive a first supply voltage and a second supply voltage; a midrange supply voltage circuit having an input that is coupled to the first and second reference voltage generators, wherein the midrange supply voltage circuit is configured to produce a midrange supply voltage having a value approximately midway between the first supply voltage and the second supply voltage; and a first gamma correction buffer of the first group having a high-side supply voltage terminal coupled to receive the first supply voltage and a low-side supply voltage terminal coupled to receive the midrange supply voltage, and a second gamma correction buffer of the second group having a low-side supply voltage terminal coupled to receive the second supply voltage and a high-side supply voltage terminal coupled to receive the midrange supply voltage to reduce power consumption of the first gamma correction buffer of the first group and the first gamma correction buffer of the second group.