The three-dimensional (3D) light field fusion display system based on flat panel light field display (LFD) can effectively expand the depth of field (DOF) of the LFD. However, its viewing angle is narrow, which makes it difficult to reconstruct more comprehensive information of the 3D scene. In addition, the crosstalk caused by the aberration of the light control element used in the system causes aliasing in the images perceived by the viewer, reducing the quality of the 3D images. In order to achieve a high-quality 3D light field fusion display system with a large viewing angle and DOF, the calculation method of voxel size and the influence of aberration of light control element on DOF are analyzed in this paper. Based on the above analysis, the optical parameters and structure of the light control element have been redesigned, and the aspherical symmetric compound lens has been proposed and optimized for its optical characteristics using a reverse optical path scheme. A new generation of 3D light field fusion display system using optimized aspherical symmetric compound lens has been constructed and optical verification experiments have been conducted. The optical experimental results of the enlarged comparison image of the details and the comparison image of the entire viewpoint image show that the display effect of the system using optimized aspherical symmetric compound lens has improved significantly in terms of clarity and color performance compared to before. The viewing angle of the system has increased from 50° to 80°, which verifies the correctness and reliability of the DOF analysis method and the new structure of the light control element.

中文翻译：

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基于非球面对称复合透镜设计的三维光场融合显示系统景深优化及视角增强

基于平板光场显示(LFD)的三维(3D)光场融合显示系统可以有效扩展LFD的景深(DOF)。但其视角较窄，难以重建更全面的3D场景信息。此外，系统中使用的光控元件的像差引起的串扰会导致观看者感知到的图像出现混叠，从而降低 3D 图像的质量。为了实现大视角、大自由度的高质量3D光场融合显示系统，本文分析了体素尺寸的计算方法以及光控元件像差对自由度的影响。基于上述分析，对光控元件的光学参数和结构进行了重新设计，提出了非球面对称复合透镜，并采用反向光路方案对其光学特性进行了优化。构建了采用优化非球面对称复合透镜的新一代3D光场融合显示系统，并进行了光学验证实验。细节放大对比图和全视点图像对比图的光学实验结果表明，采用优化的非球面对称复合透镜的系统显示效果在清晰度和色彩表现方面较之前有了显着提升。系统的视角从50°增加到80°，验证了DOF分析方法和光控元件新结构的正确性和可靠性。