Compact design principle for diffractive exit-pupil expander in AR near-eye system

Po-Han Chiu; Ting-Wei Huang; Yun-Shou Hsu; Bo-Kai Zhang; Szu-Ta Chien; Wen-Chang Hung; Chien-Yi Huang; Yu-Chieh Cheng

doi:10.1117/12.2614660

7 March 2022 Compact design principle for diffractive exit-pupil expander in AR near-eye system

Po-Han Chiu, Ting-Wei Huang, Yun-Shou Hsu, Bo-Kai Zhang, Szu-Ta Chien, Wen-Chang Hung, Chien-Yi Huang, Yu-Chieh Cheng

Proceedings Volume 11931, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR) III; 119310C (2022) https://doi.org/10.1117/12.2614660
Event: SPIE AR VR MR, 2022, San Francisco, California, United States

Conference Poster

Abstract

For a diffractive waveguide-based augmented reality display, we demonstrate a rapid and straightforward method to define the most compact layout of an exit pupil expander (EPE) from an analysis of diffractive optical elements in kspace. The idea is to consider all k-vectors coming from in-coupling to out-coupling areas according to the grating theory, and with the geometrical tracing of the EPE region to find the optimal layout. For a working wavelength of 532 nm, 40 degrees field of view display, our method is able to fit the layout into a circular shaped area with a minimal radius or to optimize for the minimal EPE area. Furthermore, a web-based interactive application demonstrating the EPE layout calculation is provided as a layout design tool.

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Po-Han Chiu, Ting-Wei Huang, Yun-Shou Hsu, Bo-Kai Zhang, Szu-Ta Chien, Wen-Chang Hung, Chien-Yi Huang, and Yu-Chieh Cheng "Compact design principle for diffractive exit-pupil expander in AR near-eye system", Proc. SPIE 11931, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR) III, 119310C (7 March 2022); https://doi.org/10.1117/12.2614660

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