When the viewers sitting around the table observe 3D images, the viewing direction is generally oblique and the viewpoints should be distributed as annular. In this paper, a tabletop integral imaging (II) three-dimensional (3D) display system based on annular point light sources is demonstrated, which can present 3D images to multiple viewers in a standard annular viewing area with oblique viewing direction. The proposed system consists of annular point light sources, a Fresnel lens, a lens array, a two-dimensional (2D) display panel, and a diffuser screen. Each point light source illuminates the Fresnel lens to form parallel light and then illuminates the lens array and the display panel. A viewing sub-area is generated at the position of the diffuser screen, in which the 3D images can be viewed. Multiple viewing sub-areas are created in a way of time-division multiplexing to form a 360° annular viewing area. Compared with the previous tabletop 3D display, the viewing area can be concentrated at an oblique angle near the tabletop. The experimental results demonstrate the feasibility of the tabletop II 3D display system.

围坐在桌子周围的观众观看3D图像时，观看方向一般是倾斜的，视点应呈环形分布。本文展示了一种基于环形点光源的桌面一体化成像（II）三维（3D）显示系统，该系统可以在倾斜观看方向的标准环形观看区域内向多个观看者呈现3D图像。所提出的系统由环形点光源、菲涅耳透镜、透镜阵列、二维 (2D) 显示面板和漫射屏组成。每个点光源照射菲涅耳透镜形成平行光，然后照射透镜阵列和显示面板。在漫射屏的位置产生一个观看子区域，可以在其中观看3D图像。以时分复用的方式创建多个视域，形成360°环形视域。与之前的桌面3D显示器相比，可视区域可以集中在靠近桌面的倾斜角度。实验结果证明了桌面II 3D显示系统的可行性。