Programmable Gamma Buffers

Programmable gamma buffers provides multiple programmable reference voltages for gamma correction in TFT LCDs. Each gamma output comprises a 10-bit digital-to-analog converter (DAC) and high current buffer, which reduces the recovery time of the output voltages when critical levels and patterns are displayed. A precision-programmable internal reference sets the full-scale voltage of the DACs. The gamma output voltages and the programmable reference, programmed digitally through the 1 MHz (fast mode plus) I²C interface.