Compact and High-Efficiency Liquid-Crystal-on-Silicon for Augmented Reality Displays

Author:

Luo Zhenyi1,Ding Yuqiang1,Peng Fenglin2,He Ziqian2,Wang Yun2,Wu Shin-Tson1ORCID

Affiliation:

1. College of Optics and Photonics, University of Central Florida, Orlando, FL 32816, USA

2. Meta Reality Labs, 9845 Willows Road NE, Redmond, WA 98052, USA

Abstract

Compact and high efficiency microdisplays are essential for lightweight augmented reality (AR) glasses to ensure longtime wearing comfort. Liquid-crystal-on-silicon (LCoS) is a promising candidate because of its high-resolution density, high brightness, and low cost. However, its bulky illumination system with a polarizing beam splitter (PBS) cube remains an urgent issue to be overcome. To reduce the volume of the LCoS illumination system, here, we propose a compact structure with four thin PBS cuboids. Through simulations, the optical efficiency of 36.7% for an unpolarized input light can be achieved while maintaining reasonably good spatial uniformity. Such a novel design is expected to have a significant impact on future compact and lightweight AR glasses.

Funder

Meta Platforms Technologies

Publisher

MDPI AG

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