一种基于视点分段式体像素的具有100°正面观看视角的桌面式光场显示系统  

Tabletop 3D Light-Field Display with 100°Frontal Viewing Angle Based on Views-Segmented Voxels

作　　者：董昊翔 于迅博 金秋 桑新柱[1] 王葵如[1] 颜玢玢[1] 高鑫 邢树军 温旭东 徐斌 Dong Haoxiang;Yu Xunbo;Jin Qiu;Sang Xinzhu;Wang Kuiru;Yan BinBin;Gao Xin;Xing Shujun;Wen Xudong;Xu Bin(School of Electronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China;63867 Unit of PLA,Beijing 137001,China)

机构地区：[1]北京邮电大学电子工程学院,北京100876 [2]中国人民解放军63867部队,北京137001

出　　处：《中国激光》2022年第4期131-140,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(62175015,61905019,62075016)。

摘　　要：提出了一种基于视点分段式体像素的大视角全视差桌面式光场显示系统,采用了定向准直背光和反贴于分辨率为7680 pixel×4320 pixel的液晶显示屏上的柱镜阵列,实现了100°的水平观看视角,并利用光学偏折膜和全息功能屏,在适用于桌面显示的正面观看范围内实现了离散采样光场的体像素重建。设计了一种能够根据多位观看者的空间坐标划分独立视区的视点分段式体像素,并推导了其与液晶显示屏上子像素的函数映射关系,实现了对观看区域的分段式图像编码。提出了一种可为处在不同观看区域的多位观看者同时提供正确全视差光场显示的透视关系校正方法,填补了光学系统固有的垂直视差缺失,实现了桌面式光场显示中错误透视关系的自适应实时校正。Objective Tabletop three-dimensional(3 D) display can provide natural and realistic terrain scenes for viewers,which has a great application potential in many fields.With the development of advanced real-time terrain rending,it becomes feasible to acquire high definition topography based on massive terrain data.However,traditional 3 D displays are hard to reach the harsh requirements of tabletop 3 D display.For example,the auto-stereoscopic display based on a lenticular lens array or parallax barrier suffers from a small viewing zone,viewing jumps,and perspective errors due to the lack of vertical parallax.Light field display is considered to be one of the most potential methods to realize ideal realistic 3 D display.Through simulating the light rays emitted from each point of the spatial object,light field display can reconstruct the light distributions of the displayed scenes.Former efforts of our group have been devoted to achieving reconstructed high definition light field scenes in recent years.Detailed terrain data is showcased with a horizontal parallax viewing angle of more than 100°.However, if we apply this device to tabletop 3D light field display,the plane of the liquid crystal display(LCD) screen must be set horizontal,thus there are two serious flaws.First,the viewing range of this 3 D light field display is only designed for viewing from right above the screen,therefore not suitable for tabletop viewing.Second,a wrong perspective relation occurs due to the lack of vertical parallax.We hope that our strategy and work can be helpful for the design of tabletop light field display with large frontal viewing angles and for the correction of multiple viewer perspective errors.Methods First,the light field display unit,which consists of collimated light and a linear lens array(LLA) that reversely sticks on the LCD panel with a resolution of 7680 pixel × 4320 pixel,is designed to construct a high resolution 3 D scene in a large horizontal viewing angle.Then,the direction turning films(DTF) can deflect th

关 键 词：全息 光场 三维显示系统 视点分段式体像素 全视差 透视关系校正 

分 类 号：TN27[电子电信—物理电子学]