National Tsing Hua University Institutional Repository:Sequential Color LED Backlight Driving System for LCD Panels
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    Title: Sequential Color LED Backlight Driving System for LCD Panels
    Authors: Chien-Chih Chen;Chang-Yu Wu;Tsai-Fu Wu
    Teacher: 吳財福
    Date: 2007
    Publisher: Institute of Electrical and Electronics Engineers
    Relation: IEEE TRANSACTIONS ON POWER ELECTRONICS, Institute of Electrical and Electronics Engineers, Volume 22, Issue 3, MAY 2007, Pages 919-925
    Keywords: light emitting diode (LED)
    liquid crystal display (LCD)
    ripple free
    sequential color display
    Abstract: In this paper, a sequential color light emitting diode (LED) backlight driving system for liquid crystal display (LCD) panels is proposed. Due to improvement on luminous efficacy, long life and wide color gamut, LED has gradually substituted for cold cathode fluorescent lamp as backlight. The proposed driving system adopts sequential color scanning scheme to improve light utilization efficiency by removing color filter. To meet display performance requirement that chromaticity variation Delta uv needs to be limited below 0.002, this paper also proposes a family of output current ripple free topologies to control the average driving current precisely, which in turn can reduce chromaticity variation. In addition, an LED bypass circuit is proposed to prevent LED arrays from open-circuit, and a driving voltage resetter is introduced to eliminate current spikes, improving backlight reliability and availability significantly. A forward-type output current ripple free converter has been built to sequentially drive color LED arrays, from which experimental measurements have verified the discussed performance and feasibility of the proposed system.
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    Appears in Collections:[Department of Electrical Engineering] EE Journal / Magazine Articles

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