Liquid Crystal Display (LCD) supplied by highly integrated dual-side dual-output switched-capacitor DC-DC converter with only two flying capacitors

Yang Ching Lin*, Yean Kuo Luo, Ke-Horng Chen, Wei Chou Hsu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

This paper proposes a highly integrated dual-side dual-output (DSDO) switched-capacitor (SC) converter with only two flying capacitors. Generally, a dual-phase voltage doubler and an inverter are used to supply positive and negative voltages for thin film transistor-liquid crystal display (TFT-LCD) gate drivers, respectively. Four flying capacitors, eight pin-outs for the four flying capacitors, and 16 power switches are necessary for their operations in the driver integrated chip (IC). The proposed DSDO SC converter combines both dual-phase voltage doubler and inverter converter in one channel through the use of time multiplexing technique with minimal performance degradation. As a result, the proposed converter not only reduces the number of flying capacitors from four to two, but also removes four IC pin-outs for lower cost and more compact size. Moreover, the 16 required power switches are reduced to 12, resulting in an approximated 27% decrease of the silicon area.

Original languageEnglish
Article number5995125
Pages (from-to)439-446
Number of pages8
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume59
Issue number2
DOIs
StatePublished - 1 Jan 2012

Keywords

  • Constant frequency regulation
  • DC-DC power converter
  • dual phase voltage doubler
  • dual-side dual-output
  • inverter
  • switched-capacitor converter

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