Patent ID: 7554517

Claim:
A gamma reference voltage generator for generating and applying gamma reference voltages to a source driver circuit of an LCD display system in response to gray scale codes received from a controller, comprising: a control interface logic circuit having an output bus; a first register including a plurality of groups of storage cells, the storage cells of each group having an input coupled to corresponding conductors of the output bus of the control interface logic circuit; a plurality of DACs each having an input coupled to an output of a corresponding storage cell of the second register; a plurality of buffers each having an input coupled to an out of a corresponding DAC and an output coupled to a resistor-string DAC of the source driver circuit and to source driver switch circuitry of the source driver circuit; the control interface logic circuit being operative to: receive gray scale codes representative of gamma reference voltages to be applied to source drivers of the source driver circuit and transfer the gray scale codes via the output bus to corresponding storage cells of the first register, and cause the gray scale codes in the first register to be applied to inputs of the DACs to produce signals representative of the gamma correction voltages to be applied to the source driver circuit.