Design and stray light analysis of ultra-thin geometrical waveguide

Qiwei Wang; Dewen Cheng; Qichao Hou; Yuan Hu; Yongtian Wang

doi:10.1117/12.2193455

5 August 2015 Design and stray light analysis of ultra-thin geometrical waveguide

Qiwei Wang, Dewen Cheng, Qichao Hou, Yuan Hu, Yongtian Wang

Proceedings Volume 9618, 2015 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments; 961815 (2015) https://doi.org/10.1117/12.2193455
Event: International Conference on Optical Instruments and Technology 2015, 2015, Beijing, China

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.

Citation Download Citation

Qiwei Wang, Dewen Cheng, Qichao Hou, Yuan Hu, and Yongtian Wang "Design and stray light analysis of ultra-thin geometrical waveguide", Proc. SPIE 9618, 2015 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 961815 (5 August 2015); https://doi.org/10.1117/12.2193455

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available