A 10-Bit Low-Power High-Color-Depth Column Driver with Two-Stage Multi-Channel RDACs for Small-Format TFT-LCD Driver ICs

Ping Yeh Yin, Chih Wen Lu, Yuan Ho Chen, Hsin Chin Liang, Sheng Pin Tseng

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

This study proposes a 10-bit low-power high-color-depth LCD column driver IC with two-stage multi-channel RDACs and switch resistance compensation. The design removes intermediate buffers from two-stage RDACs and uses global reference buffers to isolate the global resistor string and output channels. Because the global resistor string is isolated from output channels, the global resistor string can use a larger resistance value to achieve lower power consumption. This study proposes a class-AB buffer for the global reference buffers to compensate for the errors caused by the voltage drop on switches connected in series with the channel resistor string. The channel resistor strings also reuse the output stage current of the global buffer to reduce power consumption. A prototype of a 200-channel column driver was fabricated using 0.18-\mum/0.35-\mum CMOS technology with the worst DNL/INL being 1.2/1.1 LSB. The proposed 10-bit DAC occupies only 66% of the area of a conventional 8-bit RDAC using the same technology. The 200-channel column driver consumes a total static current of only 0.38 mA.

Original languageEnglish
Article number7110497
Pages (from-to)1061-1068
Number of pages8
JournalJournal of Display Technology
Volume11
Issue number12
DOIs
StatePublished - 1 Dec 2015

Keywords

  • column driver
  • Digital-To-Analog converter
  • LCD driver
  • liquid crystal display (LCD)

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