Optical System Design

Dot-pattern design of a light guide in an edge-lit backlight using a regional partition approach

[+] Author Affiliations
Jee-Gong Chang

National Center for High-Performance Computing, No. 28, Nan-Ke 3rd Road, Hsin-Shi, Tainan, Taiwan

Yu-Bin Fang

National Center for High-Performance Computing, No. 28, Nan-Ke 3rd Road, Hsin-Shi, Tainan, Taiwan

Opt. Eng. 46(4), 043002 (April 10, 2007). doi:10.1117/1.2721423
History: Received June 26, 2006; Revised October 01, 2006; Accepted October 08, 2006; Published April 10, 2007
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This paper employs a regional partition approach to establish the optimal distribution of the diffuser dots in the light guide of an edge-lit backlight. The proposed approach commences by dividing the light guide into a number of partitions and assigning an equal radius to every dot. An iterative optimization procedure is then performed in which the illuminance in each partition is calculated and the dot radius in each partition progressively adjusted until uniform luminance is obtained over the entire light-guide surface. To simplify the geometry construction process and improve the efficiency of the optimization procedure, a simple optical model is proposed for the diffuser dots and the bare surface of the light guide, and an analytical procedure is implemented to take account of the diffuser-film and brightness-enhancement-film effects. The simulation results confirm the ability of the proposed approach to accurately reflect the fine regulation of the dot radius required to obtain uniform luminance for typical light-emitting diode configurations used in practical backlight modules.

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© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

Jee-Gong Chang and Yu-Bin Fang
"Dot-pattern design of a light guide in an edge-lit backlight using a regional partition approach", Opt. Eng. 46(4), 043002 (April 10, 2007). ; http://dx.doi.org/10.1117/1.2721423


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