A column driver architecture with double time-division multiplexing RDACs for TFT-LCD applications

Chih Wen Lu*, Ping Yeh Yin, Ying Ting Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

This study proposes a thin-film-transistor (TFT) liquid crystal display (LCD) column driver architecture with double time-division multiplexing (TDM) resistor-string digital-to-analog converters (RDACs). A row of sample-and-hold circuits is used as a multiplexer to obtain a high multiplex ratio without requiring low temperature polysilicon TFTs on the display panel. The double TDM operation is proposed to compensate for the kickback noise produced by the output buffer. To improve the linearity of the DAC and the uniformity of the column driver, quasibootstrapped switches are used in the multiplexer to connect the DACs and output buffers. The column driver prototype was implemented by using 0.35μm/0.5 μ m CMOS technology with a worst positive-polarity differential nonlinearity/integral nonlinearity (DNL/INL) of 0.77/0.77 LSB and a negative-polarity DNL/INL of 0.79/0.79 LSB. The average data conversion rate of the RDAC is 18.2 MSPS and the die area per channel is only 0.017 mm2.

Original languageEnglish
Article number6894638
Pages (from-to)2352-2364
Number of pages13
JournalIEEE Journal of Solid-State Circuits
Volume49
Issue number10
DOIs
StatePublished - 1 Oct 2014

Keywords

  • column driver
  • Digital-to-analog converter (DAC)
  • LCD driver
  • liquid crystal display (LCD)
  • resistor-string DAC (RDAC)
  • thin-film-transistor (TFT)
  • time-division multiplexing (TDM)

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