紧凑型纯相位全息近眼三维显示  

Compact Phase-Only Holographic Near-Eye 3D Display

作　　者：蔡晓峰 宋恭渝 杨鑫 王曾垚 文清 许富洋[1,2] 任志君 Cai Xiaofeng;Song Gongyu;Yang Xin;Wang Zengyao;Wen Qing;Xu Fuyang;Ren Zhijun(Institute of Information Optics,College of Physics and Electronic Information Engineering,Zhejiang Normal University,Jinhua 321004,Zhejiang,China;Key Laboratory of Researching Optical Information Detecting and Display Technology in Zhejiang Province,Jinhua 321004,Zhejiang,China;Lochn Optics-Micro/Nano Photonics Research Center,Shenzhen 518000,Guangdong,China)

机构地区：[1]浙江师范大学物理与电子信息工程学院信息光学研究所,浙江金华321004 [2]浙江省光信息检测与显示技术研究重点实验室,浙江金华321004 [3]珑璟光电-微纳光学研究中心,广东深圳518000

出　　处：《光学学报》2023年第5期88-96,共9页Acta Optica Sinica

基　　金：国家自然科学基金(62005006);浙江省光信息检测与显示技术研究重点实验室开放课题。

摘　　要：提出了一种紧凑型纯相位全息近眼显示方法,避免了4f系统的使用且通过滤波可消除零级光和高级衍射光的干扰,能够实现近眼虚拟现实(VR)和增强现实(AR)三维显示。在进行全息图计算时,三维物体被分割成多层图像,利用每一层图像相对于投影透镜焦平面的距离和投影透镜的焦距获得该深度对应的补偿相位因子,采用迭代优化算法获得三维物体的纯相位全息图并在所提系统中进行显示。通过数值模拟和光学实验,证明了所提方法的有效性。Objective As a virtual 3D space parallel to reality,metaverse can greatly enrich human life and work and has received extensive attention.Augmented reality(AR)and virtual reality(VR)are considered the gateway to the metaverse.True 3D display without visual fatigue caused to human eyes is the key to AR and VR displays.Among the 3D displays such as light field 3D display,the holographic 3D display is the only way to completely reconstruct the phase and amplitude information of 3D scenes.The phase-only hologram is more attractive for its higher diffraction efficiency.The spatial light modulator(SLM),especially the phase-only liquid crystal on silicon(LCoS),is an ideal display panel for dynamic holographic 3D displays with phase-only holograms.However,due to the pixel structure of the LCoS,there are zero-order and high-order lights,which are inevitable and very annoying for holographic near-eye 3D displays and are always filtered with 4f optical systems.The enlarged virtual 3D image is viewed with an eyepiece and the presence of 4f optical systems increases the size of the display system.Since the complex amplitude distribution of diffracted 3D scenes is difficult to be fully described by phase-only data,the computation of phase-only holograms is a big challenge.Different optimization algorithms including Gerchberg-Saxton(GS)algorithm,patterned phase-only hologram,double phase method,gradient descent algorithm and deep learning algorithm have been proposed for the phase-only hologram calculation.The above algorithms have their advantages and disadvantages.Most of the algorithms are not related to the display systems and cannot be employed to reduce the volume of the display system.Methods This paper demonstrates a compact holographic near-eye 3D display only with one projection lens and one eyepiece after the SLM,thereby avoiding the utilization of 4f optical systems and reducing the display system.In the hologram calculation,an interactive method by considering the parameters of holographic near-eye display systems

关 键 词：全息 全息三维显示 近眼显示 相位全息 虚拟现实 增强现实 

分 类 号：O438.1[机械工程—光学工程]