Design and implementation of RGB LED drivers for LCD backlight modules

Yu Kang Lo*, Kuan Hung Wu, Kai Jun Pai, Huang Jen Chiu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

105 Citations (Scopus)


In this paper, a backlight module driver driving highpower red, green, and blue light-emitting diodes (RGB LEDs) for a 19-in liquid crystal display is proposed. The dc-dc series resonant converters (SRCs) with zero-voltage switching and constantoutput- current control are implemented to drive the RGB LED arrays. Phase-shifted pulsewidth modulation dimming control is adopted to effectively narrow the load variations and improve the output voltage regulations of the SRCs. A DSP-based hysteresis control algorithm is performed to track the white-color point and the specified backlight luminance. Analysis and design considerations of the proposed drivers are presented in detail. Experimental results agree well with the theoretical predictions and confirm the validity of the proposed approach.

Original languageEnglish
Article number5166500
Pages (from-to)4862-4871
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Issue number12
Publication statusPublished - 2009 Dec


  • And blue light-emitting diodes (RGB LEDs)
  • Green
  • Hysteresis control algorithm
  • Phase-shifted pulsewidth modulation (PSPWM) dimming
  • Red
  • Series resonant converter (SRC

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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