Design of a high-performance in-coupling grating using differential evolution algorithm for waveguide display

Illuminance nonuniformity caused by natural vignetting can seriously affect the display quality of large-field-of-view (FOV) waveguide displays. In this paper, an optimization method based on the differential evolution algorithm is proposed for in-coupling grating design to improve coupling efficien...

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Bibliographic Details
Published in:Optics express 2018-10, Vol.26 (20), p.26646-26662
Main Authors: Pan, Cheng, Liu, Zeyang, Pang, Yajun, Zheng, Xianxin, Cai, Huaiyu, Zhang, Yinxin, Huang, Zhanhua
Format: Article
Language:English
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Summary:Illuminance nonuniformity caused by natural vignetting can seriously affect the display quality of large-field-of-view (FOV) waveguide displays. In this paper, an optimization method based on the differential evolution algorithm is proposed for in-coupling grating design to improve coupling efficiency and compensate for natural vignetting. The in-coupling grating parameters are optimized to achieve efficiency distributions in which efficiency increases continuously with incidence angle, realizing uniform illuminance over a large FOV of 45°. The angular uniformity reaches 0.89. Additionally, average diffraction efficiency reaches 89.13% for transverse-electric polarization at 532 nm and 76% in the wavelength region between 450 and 700 nm.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.26.026646