Uniform light distribution by using microlenses with various focal lengths

I-Chiao Hsu; Guo-Dung John Su

doi:10.1117/12.893499

21 September 2011 Uniform light distribution by using microlenses with various focal lengths

I-Chiao Hsu, Guo-Dung John Su

Proceedings Volume 8124, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII; 812405 (2011) https://doi.org/10.1117/12.893499
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

The increasing demands for non-self-emissive portable display devices jointly stimulate the needs for additional front light units to provide extra illumination to compensate for the ambient light in dim environment. The advantages of light emitting diodes (LED), such as high efficiency and small size, make it an ideal source for the compact unit, but direct LED lighting is impractical. Secondary optics is commonly adopted in illumination occasions to ensure the output from the LED dies meet the overall specification. Considering an oblique incidence situation, light mapping redistribution is inevitable. In this paper, we propose a beam shaping method adopting microlens array with various focal length to achieve uniform light distribution. The design is based on edge ray principle, which considers each microlens individually. Microlenses with various focuses were made by photoresist thermal reflow process to verify the novel design.

Citation Download Citation

I-Chiao Hsu and Guo-Dung John Su "Uniform light distribution by using microlenses with various focal lengths", Proc. SPIE 8124, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII, 812405 (21 September 2011); https://doi.org/10.1117/12.893499

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KEYWORDS

Microlens

Light emitting diodes

LED lighting

Microlens array

Lenses

Light

Light sources

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