Qin Zong, Chou Ping-Yen, Wu Jui-Yi, Huang Cheng-Ting, Huang Yi-Pai
Opt Lett. 2019 May 15;44(10):2438-2441. doi: 10.1364/OL.44.002438.
Light field displays based on integral imaging feature ultra-compact volume and freedom of the vergence-accommodation conflict for advanced virtual reality and augmented reality devices; however, they currently suffer from low visual resolution. Considering that subpixels have an intrinsically tripled resolution compared with triad pixels, this Letter develops a subpixel-level algorithm by recombining subpixels with relatively small raytracing errors from different elemental images. As a result, based on a highly accurate image formation model, the resolution of a typical system (pixel size, 7.8 μm; system thickness, 4.07 mm) is remarkably enhanced from 8.3 to 20.0 pixels per degree, for a gain of 2.41. In addition, the color breakup introduced by the chromatic subpixels is largely suppressed.
基于积分成像的光场显示器具有超紧凑的体积，并且在先进的虚拟现实和增强现实设备中不存在辐辏调节冲突问题；然而，它们目前存在视觉分辨率较低的问题。考虑到子像素与三元像素相比固有地具有三倍的分辨率，本文通过将来自不同元素图像的具有相对较小光线追踪误差的子像素重新组合，开发了一种子像素级算法。结果，基于高精度成像模型，一个典型系统（像素尺寸为7.8μm；系统厚度为4.07mm）的分辨率从每度8.3像素显著提高到20.0像素，增益为2.41。此外，由彩色子像素引入的颜色分离也得到了很大程度的抑制。
