水平光场三维(3D)显示可以在保证较好立体显示效果的同时,显著压缩需处理的海量光线信息,因此是一种重要的三维显示方法。由于缺少竖直方向的光场变化,水平光场的显示清晰度表现力与单目聚焦能力都与理想的光场形式不同。基于扫描型光场显示技术,分析了水平光场的点扩展函数(PSF);基于人眼和相机的自动聚焦原理,对不同显示参数下所重构的水平光场进行聚焦仿真,得出光线横向散射角以及每圈更新图像数对水平光场单目聚焦能力的影响;通过扫描型水平光场显示样机对所得结论进行验证。结果表明,水平光场的最大可聚焦高度随光线横向散射角的增加而减小,随每圈更新图像数的增加而增加。该分析方法及结论可以为单目聚焦水平光场显示系统提供设计依据。

Horizontal light field three-dimensional (3D) display is an important 3D display method, it can achieve fairly good 3D display effect when remarkably compressing the mass information of light rays that need to be processed. As there is no change in vertical light field, its expressive force of display definition and the ability of monocular focusing for horizontal light field are both different from the ideal light field. The point spread function (PSF) of the horizontal light field is analyzed based on the scanning light field display. Based on the auto-focusing principle of human eye and camera, the horizontal light field that is reconstructed under different display parameters is focusing simulated, which shows that the effect of horizontal scattering angle of light and the image number per screen spinning circle of the projection on the monocular focusing ability in horizontal light field is obtained. The conclusion is verified by using a scanning horizontal light field display prototype. And the results show that the maximum focusing height of horizontal light field declines with the increasing of horizontal diffusing angle of light ray, and it goes up with the increasing of the image number per screen spinning circle of the projection. The proposed analytical method and the conclusion can provide the design consideration for the horizontal light field display system of monocular focusing.