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Design and stray light analysis of ultra-thin geometrical waveguide

机译：超薄几何波导的设计与杂散光分析

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摘要

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.
机译：如今，波导具有厚度小，重量轻的优点，因此在近眼显示领域引起了越来越多的关注。然而，作为主要问题，在波导中产生的杂散光严重降低了显示质量。本文使用非序列光线跟踪软件LightTools设计了具有分束镜阵列（BSMA）的几何波导，并付出了巨大的努力来研究杂散光的原因和解决方案。通过基于杂散光/有用光比率的标准进行质量计算和优化，找到了杂散光量最少的最佳设计。为了进一步消除杂散光，设计了一种将射线耦合到波导中的新颖结构。经过优化的波导在光瞳扩展方向上的FOV为36°，杂散光能量相对于有用光降低至1％，出射光瞳直径为11.6mm，而护眼直径为20mm，厚度为2.4毫米

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  • 来源
    《》|2015年|961815.1-961815.9|共9页
  • 会议地点 Beijing(CN)
  • 作者

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

  • 作者单位

    Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;

    Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;

    Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;

    Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;

    Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    geometrical waveguide; stray light analysis; near-eye display; coupling-in structure;

    机译：几何波导杂散光分析；近眼显示器耦合结构;

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