10-bit source driver with resistor-resistor-string digital-to-analog converter

— A 10-bit gray-scale source driver using a resistor-resistor-string digital-to-analog converter (RR-DAC) is proposed for a TFT-LCD source driver. The 10-bit RR-DAC consists of an 8-bit resistor-string DAC and a two-bit resistor-string DAC without an intermediate unity-gain buffer to isolate the parallel-connected resistor string. The output deviation of the proposed source driver is less than ±3 mV. The chip area of the proposed 10-bit source driver with an RR-DAC is increased to 29% of that of an 8-bit source driver.