Optical design in illumination system of digital light processing projector using laser and gradient-index lens

Dawei Rui; Zulun Lin; Kang-Cheng Qi; Wenbin Chen

doi:10.1117/1.OE.51.1.013004

20 January 2012 Optical design in illumination system of digital light processing projector using laser and gradient-index lens

Dawei Rui, Zulun Lin, Kang-Cheng Qi, Wenbin Chen

Author Affiliations +

Optical Engineering, Vol. 51, Issue 1, 013004 (January 2012). https://doi.org/10.1117/1.OE.51.1.013004

Abstract

A novel structure of illumination system based on laser sources and gradient-index (GRIN) lens arrays for single-plate digital light processing (DLP) projector is proposed. Under the evaluation of light collection efficiency and illumination uniformity, we designed two different architectures of GRIN lens arrays: the unit lens cross section being either square or circular. Also, we designed the one-to-one coupling mechanism between GRIN lens array and Gaussian beam array. By means of three-dimensional modeling and ray tracing, we simulated the optical characteristics of illumination system, and the optical parameters are evaluated. Results show that the total light collection efficiency is 37.9%, the illumination uniformity is 89.7% and the volume is only 12.4 cm³. Thus we improved optical characteristics and reduced the physical dimension of DLP optical engine.

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Dawei Rui, Zulun Lin, Kang-Cheng Qi, and Wenbin Chen "Optical design in illumination system of digital light processing projector using laser and gradient-index lens," Optical Engineering 51(1), 013004 (20 January 2012). https://doi.org/10.1117/1.OE.51.1.013004

Published: 20 January 2012

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