阵列波导AR显示系统出瞳面光均匀性优化及漏光抑制  

Light Uniformity Optimization and Light Leakage Suppression in the Exit Pupil Plane of Array Waveguide AR Display System

作　　者：段涛涛 仝晓刚 楼国红 张蕊蕊 张麟华 黄伟[2] DUAN Taotao;TONG Xiaogang;LOU Guohong;ZHANG Ruirui;ZHANG Linhua;HUANG Wei(College of Computer Science and Technology,Taiyuan Normal University,Jinzhong 030619,China;Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Suzhou 215123,China;Department of Electronic Engineering,Taiyuan University of Technology,Taiyuan 030008,China;Shanxi University of Science and Technology,Changzhi 048011,China)

机构地区：[1]太原师范学院计算机科学与技术学院,晋中030619 [2]中国科学院苏州纳米技术与纳米仿生研究所,苏州215123 [3]太原工业学院电子工程系,太原030008 [4]山西科技学院,长治048011

出　　处：《光子学报》2024年第9期181-191,共11页Acta Photonica Sinica

基　　金：江苏省科技项目(No.BE2021667);太原市“双百攻关行动”揭榜挂帅项目(No.2024TYJB0126);山西省重点研发计划项目(No.201903D121171)。

摘　　要：阵列波导增强现实显示系统部分反射镜反射率参数组合多,手动优化耗时且难以获得优化的参数组合,导致显示均匀性不佳。为此结合Python与LightTools对阵列波导各个部分反射镜反射率进行自动优化,获得优化的反射率参数组合;基于人眼角分辨率极限要求,利用蒙特卡罗方法对波导基板上下表面和部分反射镜阵列的平行公差要求进行仿真分析,在此基础上优化设计了阵列波导显示系统,提出了在阵列波导出光面镀增透膜的漏光抑制方法,进而开发了视场角为40°、出瞳均匀性达83%的阵列波导增强现实显示样机。样机在颜色均一性和还原性等指标方面有显著优势,实现了高出瞳面光均匀性,且明显降低了漏光。At present,there are many combinations of reflectance parameters of the partial reflector of the array optical waveguide.Manual optimization takes a long time,and it is difficult to obtain the optimal parameter combination,resulting in poor display image quality.On the other hand,there is a widespread problem of light leakage,which will reveal the user´s privacy,especially when used as a target in a nighttime military environment.In this paper,the reflectance of each part of the array waveguide is automatically optimized with Python and LightTools,and the simulation model of optical machine-waveguide-human eye all-element AR display is established.The reflectance range of each part of the reflector is set in Python and initialized.By calling the API interface of LightTools in Python,the reflectance of each part of the LightTools simulation model is evaluated according to a specific step size,and the optical uniformity of the pupil plane is automatically simulated and calculated.After the cycle is over,the optical uniformity under all reflectance combinations is sorted.The reflectance combination corresponding to the maximum optical uniformity is the reflectance parameter combination after optimizing the optimal reflectance.The causes of stray light are analyzed in detail,and it is proposed that the light is incident at a specific angle after coupling into the system to avoid stray light I1.At the same time,the angle selection film is innovatively proposed to suppress stray light I2.The angle selection film is a partial mirror film with different reflectance characteristics for incident light at different angles,which can simultaneously satisfy the reflection of small angle light and the transmission of large angle light.The parallel tolerance requirements of waveguide substrate,upper and lower surface and partial mirror array are simulated by Monte Carlo method based on the limit requirement of viewing angle resolution.The parallelism of waveguide depends on the parallelism of substrate material,the parallelism

关 键 词：阵列光波导 增强现实 自动优化 蒙特卡罗分析 均匀性 漏光 

分 类 号：O439[机械工程—光学工程]