Liu Li, Sang Xinzhu, Yu Xunbo, Gao Xin, Wang Yuedi, Pei Xiangyu, Xie Xinhui, Fu Bangshao, Dong Haoxiang, Yan Binbin
Opt Express. 2021 Oct 11;29(21):34035-34050. doi: 10.1364/OE.439805.
Three-dimensional (3D) light-field displays (LFDs) suffer from a narrow viewing angle, limited depth range, and low spatial information capacity, which limit their diversified application. Because the number of pixels used to construct 3D spatial information is limited, increasing the viewing angle reduces the viewpoint density, which degrades the 3D performance. A solution based on a holographic functional screen (HFS) and a ladder-compound lenticular lens unit (LC-LLU) is proposed to increase the viewing angle while optimizing the viewpoint utilization. The LC-LLU and HFS are used to create 160 non-uniformly distributed viewpoints with low crosstalk, which increases the viewpoint density in the middle viewing zone and provides clear monocular depth cues. The corresponding coding method is presented as well. The optimized compound lenticular lens array can balance between suppressing aberration and improving displayed quality. The simulations and experiments show that the proposed 3D LFD can present natural 3D images with the right perception and occlusion relationship within a 65° viewing angle.
三维（3D）光场显示器（LFD）存在视角窄、深度范围有限和空间信息容量低的问题，这限制了它们的多样化应用。由于用于构建3D空间信息的像素数量有限，增大视角会降低视点密度，从而降低3D性能。提出了一种基于全息功能屏幕（HFS）和梯形复合双凸透镜单元（LC-LLU）的解决方案，以在优化视点利用率的同时增大视角。LC-LLU和HFS用于创建160个具有低串扰的非均匀分布视点，这增加了中间视区的视点密度并提供了清晰的单眼深度线索。还提出了相应的编码方法。优化后的复合双凸透镜阵列可以在抑制像差和提高显示质量之间取得平衡。仿真和实验表明，所提出的3D LFD能够在65°视角范围内呈现具有正确感知和遮挡关系的自然3D图像。
