Integrating the promising waveguide or lightguide optical combiners to head-mounted lightfield display (LF-HMD) systems offers a great opportunity to achieve both a compact optical see-through capability required for augmented or mixed reality applications and true 3D scene with correct focus cues required for mitigating the well-known vergence-accommodation conflict. Due to the non-sequential ray propagation nature of these flat combiners and the ray construction nature of a lightfield display engine, however, adapting these two technologies to each other confronts several significant challenges. In this paper, we explore the feasibility of combining an integral-imaging-based lightfield display engine with a geometrical lightguide based on microstructure mirror arrays. The image artifacts and the key challenges in a lightguide-based LF-HMD system are systematically analyzed and are further quantified via a non-sequential ray tracing simulation. We further propose to utilize polymer-dispersed liquid-crystal (PDLC) films to address the inherent problems associated with a lightguide combiner such as increasing the viewing density and improving the image coupling uniformity. We finally demonstrate, to our best knowledge, the first lightguide-based LF-HMD system that takes the advantages of both the compact form factor of a lightguide combiner and the true 3D virtual image rendering capability of a lightfield display.

中文翻译：

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基于几何光导的头戴式光场显示器，使用聚合物分散的液晶膜。

将有希望的波导或光导光学组合器集成到头戴式光场显示（LF-HMD）系统中，提供了一个绝佳的机会，既可以实现增强或混合现实应用所需的紧凑型光学透视功能，又可以通过正确的聚焦提示实现真正的3D场景用于缓解众所周知的趋同住宿冲突。然而，由于这些平面组合器的非顺序射线传播特性和光场显示引擎的射线构造特性，使这两种技术相互适应面临若干重大挑战。在本文中，我们探索了将基于积分成像的光场显示引擎与基于微结构镜阵列的几何光导相结合的可行性。系统地分析了基于光导的LF-HMD系统中的图像伪影和关键挑战，并通过非顺序光线跟踪仿真对其进行了进一步量化。我们进一步建议利用聚合物分散的液晶（PDLC）膜来解决与光导组合器相关的固有问题，例如增加观看密度和改善图像耦合均匀性。最后，我们将尽我们所知展示第一个基于光导的LF-HMD系统，该系统同时利用了光导组合器的紧凑外形和光场显示器真正的3D虚拟图像渲染功能。我们进一步建议利用聚合物分散的液晶（PDLC）膜来解决与光导组合器相关的固有问题，例如增加观看密度和改善图像耦合均匀性。最后，我们将尽我们所知展示第一个基于光导的LF-HMD系统，该系统同时利用了光导组合器的紧凑外形和光场显示器真正的3D虚拟图像渲染功能。我们进一步建议利用聚合物分散的液晶（PDLC）膜来解决与光导组合器相关的固有问题，例如增加观看密度和改善图像耦合均匀性。最后，我们将尽我们所知展示第一个基于光导的LF-HMD系统，该系统同时利用了光导组合器的紧凑外形和光场显示器真正的3D虚拟图像渲染功能。