Patent ID: 7446747

Claim:
A multiple channel programmable gamma correction voltage generator, comprising: a reference voltage applied across a resistor ladder; said resistor ladder including M adjustable tap resistors distributed along said resistor ladder, each providing a corresponding one of M tap voltages distributed according to a gamma correction value, wherein M is a positive integer; said resistor ladder comprising a plurality of first resistors coupled in series, each of said plurality of first resistors comprising a plurality of second resistors coupled in series forming a plurality of intermediate locations; M buffers, each having an input receiving a corresponding one of said M tap voltages and an output providing a corresponding one of M gamma correction voltages; select logic which inserts each of said M adjustable tap resistors into said resistor ladder into M of said plurality of first resistors by inserting a corresponding one of said M adjust adjustable tap resistors at a selected one of said plurality of intermediate locations of a corresponding one of said plurality of first resistors, and that selects a tap point of each of said M adjustable tap resistors to select each of said M tap voltages based on corresponding select values; and a programmable non-volatile memory device, coupled to said select logic, that provides said select values indicative of said gamma correction value.