Effects of various diffuser plates on illumination uniformity for reflective LED module

Po-Li Chen; Chun-Hsiang Liao; Han-Ting Chen; Wei-Jei Peng; Hui-Jean Kuo; Yu-Hsin Lin; Yu-Hsiang Tang; Tsung-Xian Lee

doi:10.1117/12.2189596

17 July 2015 Effects of various diffuser plates on illumination uniformity for reflective LED module

Po-Li Chen, Chun-Hsiang Liao, Han-Ting Chen, Wei-Jei Peng, Hui-Jean Kuo, Yu-Hsin Lin, Yu-Hsiang Tang, Tsung-Xian Lee

Proceedings Volume 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015); 95241W (2015) https://doi.org/10.1117/12.2189596
Event: International Conference on Optical and Photonic Engineering (icOPEN2015), 2015, Singapore, Singapore

Abstract

This paper presents the illumination uniformity study on the reading area for a well-designed reflective LED lighting module by placing diffuser plate with optical simulation technique. The investigation for the performance of intensity and uniformity was performed and discussed by changing various curvatures of diffuser plate with and without microstructures to reflect and spread light. Due to the development of microstructures on diffuser plate, the light intensity distribution was uniformed on the reading area. In addition, the diffusion and spreading effect from a curved surface with microstructures was better than that without curvature or microstructures. The illumination uniformity was strongly influenced by the shape of microstructure on reflective diffuser plate. The optimal design with cylinder-shape microstructure on the lampshade had better performance in this study; the illumination uniformity was increased from 17 % to 69 % and the enhancement was 75 %. A well-designed diffuser plate model was fabricated by CNC machine and the deviations between experimental and simulated illumination results for maximum intensity and uniformity were 7.4 % and 8.7 %, respectively.

Citation Download Citation

Po-Li Chen, Chun-Hsiang Liao, Han-Ting Chen, Wei-Jei Peng, Hui-Jean Kuo, Yu-Hsin Lin, Yu-Hsiang Tang, and Tsung-Xian Lee "Effects of various diffuser plates on illumination uniformity for reflective LED module", Proc. SPIE 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015), 95241W (17 July 2015); https://doi.org/10.1117/12.2189596

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