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Proceedings Paper

Design and stray light analysis of ultra-thin geometrical waveguide
Author(s): Qiwei Wang; Dewen Cheng; Qichao Hou; Yuan Hu; Yongtian Wang
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Paper Abstract

Nowadays, the waveguide has the advantages of small thickness and light weight so that it attracts more and more attention in the field of near-eye display. However, as a major problem, stray lights generated in the waveguide seriously degrade the display quality. In this paper, a geometrical waveguide with a beam-splitting mirror array (BSMA) is designed by using the non-sequential ray-tracing software LightTools, and great efforts are paid to study the causes and solutions of the stray light. With mass calculation and optimization based on the criterion of stray light/useful light ratio, an optimum design with the least amount of stray lights is found. To further eliminate the stray light, a novel structure that couples the rays into the waveguide is designed. The optimized waveguide has a FOV of 36° in the pupil-expanding direction of the waveguide, with stray light energy reduced to 1% over the useful light, the exit pupil diameter is 11.6mm at an eye relief of 20mm and the thickness is 2.4mm.

Paper Details

Date Published: 5 August 2015
PDF: 9 pages
Proc. SPIE 9618, 2015 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 961815 (5 August 2015); doi: 10.1117/12.2193455
Show Author Affiliations
Qiwei Wang, Beijing Institute of Technology (China)
Dewen Cheng, Beijing Institute of Technology (China)
Qichao Hou, Beijing Institute of Technology (China)
Yuan Hu, Beijing Institute of Technology (China)
Yongtian Wang, Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 9618:
2015 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Xiaodi Tan; Kimio Tatsuno, Editor(s)

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