High luminance and high see‐through head‐mounted displays with beam‐splitter‐array waveguides,Journal of the Society for Information Display

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High luminance and high see‐through head‐mounted displays with beam‐splitter‐array waveguides
Journal of the Society for Information Display ( IF 1.7 ) Pub Date : 2020-11-23 , DOI: 10.1002/jsid.975
Ryuji Ukai ₁ , Takuma Kuno ₁ , Toshiteru Nakamura ₁ , Masahito Uchiyama ₁ , Satoshi Ouchi ₁

Affiliation

We have developed head‐mounted displays with high transmittance and luminance, which could be utilized outside safely without dimming glasses. We first specified required optical performance specifications by considering user's safety and usability. In order to ensure that the user is able to recognize both surrounding environment and the image of the head‐mounted display, we set the target specification that the transmittance is higher than or equal to 85%, and the luminance contrast ratio is larger than or equal to 1.15 with display image of white solid pattern. We then developed the beam‐splitter‐array waveguide to achieve the requirements. It has advantages in high efficiency and high see‐through property. In order to determine configuration of the waveguide, we have performed optical ray trace simulation. We also established versatile waveguide measurement method applicable to different‐type waveguides. By utilizing the waveguide we have developed, we made a prototype of a head‐mounted display (HMD) with high transmittance 94% and high luminance 4.8 × 10³ cd/m² and thus luminance contrast ratio 1.25 under the sun. With these advantages, our HMD is suitable for usage outside including applications of work support systems where dimming effect is not preferred, and the HMD is used under the sun.

中文翻译：

带有分束器阵列波导的高亮度，高透明头戴式显示器

我们开发了具有高透射率和亮度的头戴式显示器，可以在不调光眼镜的情况下安全地在室外使用。我们首先考虑用户的安全性和可用性来指定所需的光学性能规格。为了确保用户能够识别周围环境和头戴式显示器的图像，我们将目标规格设置为透射率大于或等于85％，并且亮度对比度大于或等于带有白色实心图案的显示图像等于1.15。然后，我们开发了分束器阵列波导来满足要求。它具有高效率和高透明性的优点。为了确定波导的配置，我们已经执行了光线轨迹仿真。我们还建立了适用于不同类型波导的通用波导测量方法。通过利用我们开发的波导，我们制作了具有高透射率94％和高亮度4.8的头戴式显示器（HMD）的原型。× 10 ³ cd / m ²，因此在阳光下亮度对比度为1.25。凭借这些优势，我们的HMD适用于外部使用，包括工作支持系统的应用，在这些应用中，调光效果不是首选，并且HMD在阳光下使用。

更新日期：2021-01-11

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