A 10-bit 1026-Channel Column Driver IC with Partially Segmented Piecewise Linear Digital-to-Analog Converters for UHD TFT-LCDs with One Billion Color Display

Chih Wen Lu*, Pei Yi Lai Lee, You Gang Chang, Xing Wei Huang, Jhih Siou Cheng, Po Yu Tseng, Chih Hsien Chou, Poki Chen, Tsin Yuan Chang, Jenny Yi Chun Liu

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

A 10-bit 1026-channel column driver IC with partially segmented piecewise linear digital-to-analog converters (DACs) was designed, simulated, and prototyped. This device is intended to improve the color depth of ultra-high-definition thin-film transistor liquid-crystal displays. The proposed column driver can output a precise gamma-corrected transfer curve without any loss of effective bit resolution. The overall chip area of the driver IC is minimized by including an area-efficient two-voltage selector, a 2-to-4 decoder embedded level shifter, and a DAC-embedded gm-modulation operational amplifier with linearity-enhanced differential pairs. A maximum inter-chip deviation voltage of output (DVO) of 16 mV was measured from five of the proposed column-driver ICs. The die dimensions of the 1026-channel column driver IC are of only 18.14 mm × 1.2 mm. The maximum settling time of the prototype is 5.6 μs when driving a load with 5-k Ω resistance and 300-pF capacitance within 10-mV tolerance of the final voltage.

Original languageEnglish
Article number8778745
Pages (from-to)2703-2716
Number of pages14
JournalIEEE Journal of Solid-State Circuits
Volume54
Issue number10
DOIs
StatePublished - Oct 2019

Keywords

  • DAC embedded op-amp
  • digital-to-analog converter (DAC)
  • liquid-crystal display (LCD) column driver
  • thin-film transistor (TFT)-LCD
  • ultra-high-definition (UHD)

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    Lu, C. W., Lai Lee, P. Y., Chang, Y. G., Huang, X. W., Cheng, J. S., Tseng, P. Y., Chou, C. H., Chen, P., Chang, T. Y., & Liu, J. Y. C. (2019). A 10-bit 1026-Channel Column Driver IC with Partially Segmented Piecewise Linear Digital-to-Analog Converters for UHD TFT-LCDs with One Billion Color Display. IEEE Journal of Solid-State Circuits, 54(10), 2703-2716. [8778745]. https://doi.org/10.1109/JSSC.2019.2927444