An Area-Effective Source Driver with 12-Bit Linear DAC for Large-Size TFT-LCDs

摘要

An area-effective 12-bit linear digital-to-analog converter (DAC) of source driver is proposed for large-size TFT-LCDs. The proposed DAC is composed of resistor-string DAC for MSB 6-bit, current DAC for LSB 6-bit and interpolation amplifiers. To reduce the area of DAC, 6-bit current DAC is designed using low voltage devices. We designed and fabricated the source driver with the proposed DAC using 0.13 μm process with 2.5 V low voltage devices and 16 V high voltage devices. One channel layout area is 17.5 μm × 600 μm, which is shrunk by 15% compared with that of 8-bit resistor-string DAC. The experimental results show that the output voltage deviation is less than 3.5 mV.