Optimization for LED arrays to achieve uniform near-field illumination

Hu Zhang; Yi Li; Wei Zhang; Yize Huang; Haifang Wang; Xiaojing Yu; Huiqun Zhu; Sheng Zhou; Ruoxi Sun; Yuming Zhang

doi:10.1117/12.865937

6 October 2010 Optimization for LED arrays to achieve uniform near-field illumination

Hu Zhang, Yi Li, Wei Zhang, Yize Huang, Haifang Wang, Xiaojing Yu, Huiqun Zhu, Sheng Zhou, Ruoxi Sun, Yuming Zhang

Proceedings Volume 7655, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 76551X (2010) https://doi.org/10.1117/12.865937
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

For achieving uniform near-field illumination, this paper is based on the theory that each LED is non-perfect Lambertian emitter, whose irradiance distribution obeys the power law. Using the theory of sparrow's criterion, two methods to realizing near-field uniform irradiance of LED arrays are discussed by taking into account of the production process of LED array, a conclusion can be made that adjusting the curve to achieve uniform near-field irradiance is impossible but adjusting the space could. The structural characteristics of three typical LED arrays are analyzed. The equations of the relationship between illumination and space, as well as the optimal arrangements of the LED arrays are given. The nearfield optical properties for LED arrays with the optimal arrangement structure are simulated by MATLAB. By using a photometer we measure the irradiance intensity of the LED arrays, and make comparisons between experimental results and theoretical results, the result shows it works well.

Citation Download Citation

Hu Zhang, Yi Li, Wei Zhang, Yize Huang, Haifang Wang, Xiaojing Yu, Huiqun Zhu, Sheng Zhou, Ruoxi Sun, and Yuming Zhang "Optimization for LED arrays to achieve uniform near-field illumination", Proc. SPIE 7655, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 76551X (6 October 2010); https://doi.org/10.1117/12.865937

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KEYWORDS

Light emitting diodes

Near field

LED lighting

LED displays

Receivers

Near field optics

Photometry

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