Hong Keehoon, Yeom Jiwoon, Jang Changwon, Li Gang, Hong Jisoo, Lee Byoungho
Opt Express. 2014 Jun 16;22(12):14363-74. doi: 10.1364/OE.22.014363.
Two-dimensional (2D) and three-dimensional (3D) transparent screens can be created using lens-array holographic optical elements (HOEs). Lens-array HOEs can be used to perform 2D and 3D imaging for Bragg matched images while maintaining the transparent properties of the images in the background scenes. 2D or 3D imaging on the proposed screen is determined by the relative size of an elemental-lens on the lens-array to a pixel on the projected image. The 2D and 3D displays on the lens-array HOEs are implemented by the diffusion of light on each elemental-lens and by taking advantage of reflection-type integral imaging, respectively. We constructed an HOE recording setup and recorded two lens-array HOEs having different optical specifications, permitting them to function as 2D and 3D transparent screens. Experiments regarding 2D and 3D imaging on the proposed transparent screens are carried out and the viewing characteristics in both cases are discussed. The experimental results show that the proposed screens are capable of providing 2D and 3D images properly while satisfying the see-through properties.
使用透镜阵列全息光学元件（HOE）可以创建二维（2D）和三维（3D）透明屏幕。透镜阵列HOE可用于对布拉格匹配图像进行2D和3D成像，同时保持背景场景中图像的透明特性。在所提出的屏幕上进行2D或3D成像取决于透镜阵列上的单元透镜与投影图像上的像素的相对大小。透镜阵列HOE上的2D和3D显示分别通过每个单元透镜上的光扩散和利用反射型积分成像来实现。我们构建了一个HOE记录装置，并记录了两个具有不同光学规格的透镜阵列HOE，使它们能够作为2D和3D透明屏幕发挥作用。针对所提出的透明屏幕进行了2D和3D成像实验，并讨论了两种情况下的观看特性。实验结果表明，所提出的屏幕能够在满足透视特性的同时适当地提供2D和3D图像。
