An area-efficient fully R-DAC-based TFT-LCD column driver

Authors:
Chih-Wen Lu;Chien-Chih Shen;Wei-Chih Chen
Affiliations:
Department of Electrical Engineering, National Chi Nan University, Puli, Taiwan;Department of Electrical Engineering, National Chi Nan University, Puli, Taiwan;Department of Electrical Engineering, National Chi Nan University, Puli, Taiwan
Venue:
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Year:
2010

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Abstract

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-µm CMOS technology to verify the proposed driving scheme. The settling time is within 5 µs, and the maximum deviation is 0.68 LSB. The average area per channel is 0.04 mm2. Compared with a conventional fully R-DAC-based TFT-LCD column driver, the proposed driving scheme has a DAC area saving of 41%.