A 402-output TFT-LCD driver IC with power-controlling function by selecting number of colors

A 402-output TFT-LCD driver with a power-controlling function by selecting a number of colors to be displayed is described. Power-controlling is realized by turning on and off reference voltage buffers used in DACs to convert RGB digital signals. The buffers must drive 1 to 402 capacitive loads. A phase compensation using a zero formed with the capacitive loads is proposed for the buffers. The analog section consumes 529 /spl mu/A, 182 /spl mu/A, 112 /spl mu/A for 262,144 colors, 4,096 colors, 512 colors, respectively.