Opt Express. 2020 Dec 21;28(26):38616-38625. doi: 10.1364/OE.413471.
Maxwellian view systems can be employed to circumvent the vergence-accommodation conflict in near-eye displays (NEDs), which directly project images onto the retina regardless of the human eye's depth of focus. However, Maxwellian view optics typically have a limited eyebox, which prevents broader applications of this architecture in NEDs. Here, we demonstrate a thin-film two-dimensional beam deflector composed of multi-twist broad-band Pancharatnam-Berry deflectors to mitigate this limitation via eyebox replication. Based on experimental validation, our proposed design can display always-focused full-color images within a 9 mm × 9 mm eyebox and thus mitigate the limitation of conventional Maxwellian displays while adding negligible weight and volume.
麦克斯韦尔观视系统可以用来解决近眼显示器（NED）中的调焦-集合冲突，因为该系统直接将图像投射到视网膜上，而与眼睛的景深无关。然而，麦克斯韦尔观视光学系统通常具有有限的眼球框，这限制了这种架构在 NED 中的更广泛应用。在这里，我们展示了一种由多扭曲宽带 Pancharatnam-Berry 偏光镜组成的薄膜二维光束偏转器，通过眼球框复制来减轻这种限制。基于实验验证，我们的设计可以在 9mm×9mm 的眼球框内显示始终聚焦的全彩色图像，从而减轻传统麦克斯韦观视显示的局限性，同时增加微不足道的重量和体积。
