High efficiency and/or low cost LED backlight system for color sequential technique in color filter-less LCD system

Chun Yu Hsieh*, Shih Jung Wang, Yu Huei Lee, Ke-Horng Chen, Ming Tsung Ho

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

This paper proposes a design methodology for implementing a high efficiency and/or a low cost RGB backlight module in color sequential notebook computers' display. A RGB LED driver composed of an asynchronous 1.5MHz DC/DC boost converter with dual loop control is fabricated by TSMC 0.25 μm BCD 40V to generate 17V or 21V output voltage to turn on more than 6 series-red, 6 series-green, or series-blue LEDs at the same time for the notebooks' backlight. Besides, charge-recycling technique is used to restore extra energy at the output node when switching to different forwarding light emitting diodes (LEDs) and release the energy next time. The total power consumption of a 15.4' LCD panel of a notebook computer can be reduced from 5W to about 2-3 W.

Original languageEnglish
Pages (from-to)1104-1107
Number of pages4
JournalDigest of Technical Papers - SID International Symposium
Volume39
Issue number2
DOIs
StatePublished - 30 Oct 2008
Event2008 SID International Symposium - Los Angeles, CA, United States
Duration: 20 May 200821 May 2008

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