一种视点均匀分布的桌面式光场显示系统  

Tabletop light field display system with uniform distribution of viewpoints

作　　者：徐斌 于迅博 高鑫 桑新柱[1] XU Bin;YU Xun-bo;GAO Xin;SANG Xin-zhu(School of Electronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]北京邮电大学电子工程学院,北京100876

出　　处：《液晶与显示》2022年第5期573-580,共8页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.62175015,No.61905019,No.62075016);中央高校基本科研业务费(No.2021RC13)。

摘　　要：基于视点分段式体像素的桌面光场显示系统具有正面观看视区以及100°超大视角,能够显示具有全视差的高质量三维图像。但是,该系统还存在所构建的视点在空间分布不均匀的问题,观看视区中间区域视点分布密集,两边区域视点分布稀疏,使得显示的三维图像出现透视关系不正确以及视点间的串扰等问题,影响显示质量。本文通过对系统视点的构建过程进行分析,发现造成视点分布不均匀问题的原因是系统采用的柱透镜存在像差,导致出射光线无法会聚于一点,而是形成一个弥散斑。因而,为了均匀系统视点分布,本文提出了采用对透镜进行光学优化的方法以减小像差,并设计了一种非球面透镜。最终通过实验验证了方法的可行性,系统视点分布的均匀度由39.32%提升至98.39%,显示图像透视关系不正确以及视点间的串扰等问题得到了有效改善。Tabletop light filed display system based on views-segmented voxels can display high quality 3D images with frontal viewing area,100°viewing angle and full parallax.However,the system also has the problem of nonuniform distribution of viewpoints.The central area of the viewing zone has dense distribution of viewpoints,and both marginal sides of the viewing zone has sparse distribution of viewpoints.Nonuniform distribution of viewpoints causes the incorrect perspective relations of the displayed 3D image and crosstalk between adjacent viewpoints.This paper performs analysis on the construction process of viewpoints and determines that the main reason for the nonuniform distribution of viewpoints is the aberration of the cylindrical lens used in the system which causes the emitted light rays not to converge at one point,but a diffuse spot.An aspheric lens is proposed and designed to optimize aberrations.Finally,the experiments are conducted to verify the correctness of the method.The uniformity of the viewpoints distribution is increased from 39.32%to 98.39%,and the problems of incorrect perspective and crosstalk between viewpoints are effectively improved.

关 键 词：光场显示 电子沙盘 视点分布 非球面透镜 

分 类 号：TN27[电子电信—物理电子学]