27.1: An Area‐Effective Source Driver with 12‐Bit Linear DAC for Large‐Size TFT‐LCDs

Abstract

AbstractAn 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.