An Area-Efficient Fully R-DAC-Based TFT-LCD Column Driver

作者：Lu Chih Wen^*; Shen Chien Chih; Chen Wei Chih

来源：IEEE Transactions on Circuits and Systems I-Regular Papers, 2010, 57(10): 2588-2601.

DOI：10.1109/TCSI.2010.2046252

• Digital-analog conversion
• driver circuits
• liquid crystal display (LCD)
• LCD driver
• offset cancellation

This paper proposes an area-efficient fully resistor- string digital-to-analog-converter (R-DAC)-based thin-film transistor liquid crystal display (TFT-LCD) column driver in which DACs supply only negative-polarity voltages, while polarity inverters generate positive-polarity voltages from negative-polarity voltages. An offset cancellation technique is employed in negative-polarity buffers and polarity inverters. An experimental prototype 8-bit column driver was implemented using 0.35-mu m CMOS technology to verify the proposed driving scheme. The settling time is within 5 mu s, and the maximum deviation is 0.68 LSB. The average area per channel is 0.04 mm(2). Compared with a conventional fully R-DAC-based TFT-LCD column driver, the proposed driving scheme has a DAC area saving of 41%.

• 出版日期2010-10