Lee Dukho, Bang Kiseung, Nam Seung-Woo, Lee Byounghyo, Kim Dongyeon, Lee Byoungho
School of Electrical and Computer Engineering, Seoul National University, Gwanak-Gu Gwanakro 1, Seoul, 08826, South Korea.
Sci Rep. 2022 Apr 22;12(1):6649. doi: 10.1038/s41598-022-10355-0.
Holographic display is considered as the most promising three-dimensional (3D) display due to its unique feature of reconstructing arbitrary wavefronts. However, the limited étendue, which hinders the immersive experience of observers, remains a major unresolved issue in holographic display technique. In this paper, we propose a novel approach to tweak the constraints of étendue by expanding the energy envelope in holographic display via mutually coherent multi-illumination. The proposed concept contains both a light source design for generating a mutually coherent multi-directional wave and a computer-generated hologram optimization framework for providing high-resolution 3D holograms. To verify the proposed approach, a benchtop prototype of a holographic near-eye display providing an intrinsic large exit-pupil is implemented. The experimental results clearly show that the exit-pupil is effectively expanded by four times and an appropriate viewpoint image is reconstructed according to the view position.
全息显示因其重建任意波前的独特特性而被认为是最具前景的三维（3D）显示技术。然而，有限的 étendue 阻碍了观察者的沉浸式体验，这仍然是全息显示技术中一个主要未解决的问题。在本文中，我们提出了一种新颖的方法，通过在全息显示中通过相互相干的多照明扩展能量包络来调整 étendue 的约束。所提出的概念既包括用于生成相互相干的多向波的光源设计，也包括用于提供高分辨率 3D 全息图的计算机生成全息图优化框架。为了验证所提出的方法，实现了一个具有固有大出瞳的全息近眼显示器的台式原型。实验结果清楚地表明，出瞳有效地扩大了四倍，并且根据视图位置重建了合适的视点图像。
