Rgb led backlight of color sequential display with precise current-balance control technique

Chia Lin Chiu, Yu Huei Lee, Chun Yu Hsieh, Ming Tsung Ho, Ke-Horng Chen, Ling Li, Chih Chung Chen

Research output: Contribution to journalConference article

1 Scopus citations

Abstract

This paper proposes a high efficiency and precise current balance circuit in parallel RGB Light Emitting Diodes (LED) channels for color filter-less panel display. The new technique not only enhances the current matching in each channel but also reduces the requirement of device numbers and external resistors. The error percentage of all channel LED currents can kept within 0.1% when the channel voltage has a voltage variation (△ VCH) around 1.1V. Furthermore, the proposed load dependent minimum drain voltage can effectively reduce the voltage drop across the precise current balance circuit. As a result, the efficiency of the LED driver can be improved.

Original languageEnglish
Pages (from-to)644-648
Number of pages5
JournalDigest of Technical Papers - SID International Symposium
Volume40
Issue number1
DOIs
StatePublished - 1 Jan 2009
Event2009 Vehicles and Photons Symposium - Dearborn, MI, United States
Duration: 15 Oct 200916 Oct 2009

Keywords

  • Field sequential color
  • Minimum voltage detection
  • Precise current balance

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