Articles

Fabrication and optical design of a pyramid microstructure for the base of a light guide used in backlight module

[+] Author Affiliations
Jee-Gong Chang

National Center for High-Performance Computing, Computational Application Division, No. 28, Nanke 3rd Road, Sinshih Township, Tainan 74147, Taiwan

Chien-Wei Liu

National Yunlin University of Science and Technology, Department of Mechanical Engineering, 123 University Road, Section 3, 64002 Yunlin, Taiwan

Wang-Long Li

National Cheng Kung University, Institute of Nanotechnology and Microsystems Engineering, Center for Micro/Nano Science and Technology, No.1 University Road, Tainan, 70101, Taiwan

Jian-Ming Lu

National Center for High-Performance Computing, Computational Application Division, No. 28, Nanke 3rd Road, Sinshih Township, Tainan 74147, Taiwan

Yu-Bin Fang

National Center for High-Performance Computing, Computational Application Division, No. 28, Nanke 3rd Road, Sinshih Township, Tainan 74147, Taiwan

J. Micro/Nanolith. MEMS MOEMS. 9(4), 043006 (December 27, 2010). doi:10.1117/1.3517108
History: Received November 30, 2009; Revised September 29, 2010; Accepted October 04, 2010; Published December 27, 2010; Online December 27, 2010
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We propose a recessed pyramid microstructure (PYM) to be used on the base of the light guide as micro-optical components to replace the conventional diffuser dot made by direct etching on the steel stamper. The PYM is made by microelectromechanical systems technology, which uses a silicon wafer for the original PYM mold, which is replicated on a Ni micromold using the electroforming method. An effective optical design tool is used to find the optimal PYM distribution integrating the random microstructure generation scheme based on the molecular dynamics method into optical commercial software. The scanning electron microscopy images show intact PYMs can be produced on the Si micromold and then replicated fully on the Ni micromold by the electroforming process. An intact PYM on the base of the light guide can then be produced by injection molding, completing the transformation of the Ni micromold for use in the light guide. The luminance measurement of a 2.4-in. backlight module with four LEDs shows an average luminance of 4769 nit with 86.3% uniformity for the PYM on the base of light guide, 10% higher than that of the diffuser dot microstructure.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Jee-Gong Chang ; Chien-Wei Liu ; Wang-Long Li ; Jian-Ming Lu and Yu-Bin Fang
"Fabrication and optical design of a pyramid microstructure for the base of a light guide used in backlight module", J. Micro/Nanolith. MEMS MOEMS. 9(4), 043006 (December 27, 2010). ; http://dx.doi.org/10.1117/1.3517108


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