Freeform OST-HMD system with large exit pupil diameter and vision correction capability  

作　　者：DEWEN CHENG JIAXI DUAN HAILONG CHEN HE WANG DANYANG LI QIWEI WANG QICHAO HOU TONG YANG WEIHONG HOU DONGHUA WANG XIAOYU CHI BIN JIANG YONGTIAN WANG 

机构地区：[1]Beijing Engineering Research Center of Mixed Reality and Advanced Display,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China [2]Ned Co.,Ltd.,Beijing 100081,China [3]Goertek Co.,Ltd.,Weifang 261031,China

出　　处：《Photonics Research》2022年第1期21-32,共12页光子学研究（英文版）

基　　金：National Key Research and Development Program of China(2017YFA0701200);National Natural Science Foundation of China(61822502);Beijing Municipal Science Technology Commission(Z201100004020011)。

摘　　要：Compactness and light weight,large exit pupil diameter and distance,small distortion for virtual image,and see-through light paths are pivotal factors to achieve a better,wearable experience of optical see-through headmounted displays(OST-HMDs).In addition,light efficiency of the virtual image light path is an important factor for heat dissipation in HMD devices.This paper presents a new type of OST-HMD optical system that includes three wedge-shaped freeform prisms and two symmetric lenses.Based on a 0.71 in.microdisplay,an OST-HMD prototype with a diagonal field of view(FOV)of 45.3°,an F-number(F/#)of 1.8,an exit pupil size of 12 mm×8 mm,and an eye relief of 18 mm is demonstrated.The maximum value of distortion of the final system is 0.6%and 0.4%for virtual image and see-through light path,respectively.The overall dimension of the optical system per eye is no larger than 30 mm(width)×40 mm(height)×14 mm(thickness),and the weight of the optical module including lenses,holder,and microdisplay is 12.8 g.The light efficiency of the virtual image light path is up to 50%higher than those of other OST-HMD optical solutions.

关 键 词：system DISTORTION CORRECTION 

分 类 号：TH74[机械工程—光学工程]