一种基于散斑结构的全息显示屏

提出一种全息平面显示屏的设计和制作方法。显示屏由全息像素单元组成,每一个像素单元都基于散斑的像面全息结构,其中基元光栅起到调制入射光并定向衍射成像的作用。分析了显示屏的视场特性,数值模拟了记录参考光不同入射角度和起限制垂直方向视场作用的狭缝的宽度对再现散斑像的影响。制作出幅面大小为600 mm×800 mm(约40″),厚度为1.5 mm的普通投影全息显示屏,给出相应的制作流程和制作参数。结果表明,全息显示屏具有高亮度和消色散的优点,浮雕型结构便于进行大幅面的快速微纳米压印复制,使得所提出的显示屏具有低成本的工艺优势。

A Holographic Display Screen Based on Laser Speckle Structure

A method of designing and fabricating display screen based on the planar holography is proposed. The holographic screen is composed of many pixels, and every pixel is produced by the speckle image holography. The input illumination is diffracted by the gratings in each pixel and directionally diffracted to reconstruct image observed on the holographic plane. The reconstructed speckle image, which is influenced by both incident angle of reference beam and the width of slot, is demonstrated by numerical simulation. A holographic projection screen sample with a size of 600 mm×800 mm (about 40 inch diagonal) and thickness of 1.5 mm is fabricated. The corresponding fabrication details are given .The proposed holographic screen has the advantages of high brightness and achromatism. Furthermore, the surface-relief micro-structure can be manufactured by the nano-imprint technology efficiently and cost-effectively.