Viewing resolution and viewing angle enhanced tabletop 3D light field display based on voxel superimposition and collimated backlight

Abstract

Light field 3D displays suffer from low resolution and narrow viewing angle, and these two problems limit the performance of tabletop light field 3D displays. A light field display method based on voxel superposition is proposed to enhance the viewing resolution of the light field 3D display. In the proposed method, a specially developed linear prism array is used to separate the original voxel array diagonally into two voxel arrays. A new voxel grid with more voxels is achieved by superimposition of the two voxel arrays and the number of voxel is increased visually. The mapping relation between the pixel on the LCD and the voxel is deduced. An image coding method based on trust-region-reflective algorithm is used to calculate the image content displayed on the LCD. The viewing resolution and smoothness of the 3D image are increased significantly. In addition, a compound lens array with the collimated backlight is designed so that the viewing angle can be increased with the decrease of aberrations. Simulations and experiments prove that the viewing resolution enhanced tabletop 3D light field display with the viewing angle of 90°×90° is achieved.