Work

Dual-focal display through polarization-directed birefringence for compact virtual reality

Year: 2026

Type: article

Abstract: A compact dual-focal virtual reality display is presented to provide discrete accommodation cues for mitigating the vergence-accommodation conflict. The architecture combines a folded-pancake optical path with an electrically switchable liquid-crystal polarization modulator and a YVO 4 birefringent doublet, enabling two steady-state focal states within a 15-mm total track length. A monocular prototype was fabricated and experimentally characterized, achieving diagonal fields of view of 43.61° and 46.03° at nominal −4 D and −0.2 D, respectively. Through-focus measurements yielded mean focal positions of −3.99 D and −0.19 D over three repeated scans. Peak spatial ghost-image intensity ratios were 2.2% and 2.3%, respectively. An idealized binary-weighted model further examines multi-focal scaling and associated practical constraints.

Source: Optics Express

DOI: 10.1364/oe.615986

Authors: Jiaping Sun, Dewen Cheng, Jianghao Xiong, Yongtian Wang

Institution: Beijing Institute of Technology

Language: English

Topic: Advanced Optical Imaging Technologies

Subfield: Media Technology

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funder: National Natural Science Foundation of China