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Proceedings Paper

Improvement and optimal design of RGB LED backlight unit using a genetic algorithm
Author(s): Yi-Hua Fan; Ying-Tsun Lee; Yi-Lin Liao; Chung-Chin Fu
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Paper Abstract

To reduce the cost of LCD backlight unit (BLU) and raise efficiency, a direct LED BLU consisted of double-triangular structures was proposed to control the light from RGB side emitting LEDs. A genetic algorithm was used to search the optimal parameters of the shape of the double-triangular structures and the layout of the LEDs. A switch mode constant current control driver with a PWM controlled converter switch was used to maintaining the constant current output for the variable numbers of the LEDs in this paper. From the simulation results showed that without the diffuser, the brightness uniformity on the 25-point test was 93.44% for a 22" direct LED backlight unit with a thickness of 30mm with the optimized double-triangular structure. And the experiment result showed that the brightness uniformity and color uniformity were 85.61% and 0.021 for a small size test unit.

Paper Details

Date Published: 27 August 2010
PDF: 8 pages
Proc. SPIE 7787, Novel Optical Systems Design and Optimization XIII, 77870I (27 August 2010); doi: 10.1117/12.860332
Show Author Affiliations
Yi-Hua Fan, Chung Yuan Christian Univ. (Taiwan)
Ying-Tsun Lee, Chung Yuan Christian Univ. (Taiwan)
Yi-Lin Liao, Chung Yuan Christian Univ. (Taiwan)
Chung-Chin Fu, Chung Yuan Christian Univ. (Taiwan)

Published in SPIE Proceedings Vol. 7787:
Novel Optical Systems Design and Optimization XIII
G. Groot Gregory; R. John Koshel, Editor(s)

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