Do Hyeongkyu, Kim Young Min, Min Sung-Wook
Appl Opt. 2019 Apr 10;58(11):2882-2889. doi: 10.1364/AO.58.002882.
In this study, a focus-free retinal projection display based on a Maxwellian view was implemented. The display was constructed using simple and cost-effective passive components, such as a retroreflector film, beam splitter, and a pinhole. As a part of the system, the pinhole and display serve as a pinhole projector, which projects images through a small exit pupil. The retroreflector film and the beam splitter form the conjugate image of the pinhole near an observer. By locating the center of the crystalline lens of an eye at the conjugate pinhole, the projected images are focused on the retina and are seldomly changed by the accommodative response of the lens. For the practical implementation of the system, a collimating lens was used as an imaging lens combined with a pinhole. The point spread function of the system was derived to theoretically demonstrate that the system exhibits focus-free features at accommodation distances of 0.25, 0.5, and 1 m. The experiments conducted to demonstrate the feasibility of the system are presented under the same accommodation condition as the analysis.
在本研究中，实现了一种基于麦克斯韦视图的无聚焦视网膜投影显示器。该显示器使用简单且经济高效的无源组件构建，如后向反射膜、分束器和针孔。作为系统的一部分，针孔和显示器充当针孔投影仪，通过小出瞳投射图像。后向反射膜和分束器在观察者附近形成针孔的共轭像。通过将眼睛晶状体的中心定位在共轭针孔处，投射的图像聚焦在视网膜上，并且很少因晶状体的调节反应而改变。为了系统的实际实现，使用准直透镜作为与针孔组合的成像透镜。推导了系统的点扩散函数，从理论上证明该系统在0.25、0.5和1米的调节距离下具有无聚焦特性。在与分析相同的调节条件下展示了证明该系统可行性的实验。
