Opt Express. 2021 Nov 22;29(24):40294-40309. doi: 10.1364/OE.444221.
Waveguide-type near-eye displays have useful properties such as compact form factor, lightweight and see-through capability. Conventional systems, however, support only a single image plane fixed at a certain distance, which may induce eye fatigue due to the vergence-accommodation conflict. In this paper, we propose a waveguide-type near-eye display with two image planes using a polarization grating. Two images with orthogonal polarizations propagate within the waveguide with different total internal reflection angles and form virtual images at different distances. The use of the polarization grating and two pairs of holographic optical elements enables dual image plane formation by a single waveguide with high transparency for the real scene. Optical experiments confirm the principle of the proposed optical system.
波导型近眼显示器具有紧凑的外形尺寸、重量轻和透视能力等优点。然而，传统系统仅支持单个固定在特定距离的图像平面，这可能由于调焦-适应冲突而导致眼睛疲劳。在本文中，我们提出了一种使用偏振光栅的具有两个图像平面的波导型近眼显示器。两个具有正交偏振的图像在波导中以不同的全内反射角传播，并在不同的距离处形成虚像。偏振光栅和两对全息光学元件的使用使得通过单个具有高透明性的波导实现了双图像平面形成，用于真实场景。光学实验证实了所提出的光学系统的原理。
