Multiview holographic 3D dynamic display by combining a nano-grating patterned phase plate and LCD
Multiview holographic 3D dynamic display by combining a nano-grating patterned phase plate and LCD
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纳米光栅图案化相位板与LCD相结合的多视点全息3D动态显示
DOI：
10.1364/oe.25.001114
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发表时间：
2017-01-23
期刊：
影响因子：
3.8
通讯作者：
Chen, Linsen
中科院分区：
文献类型：
--
作者：
Wan, Wenqiang;Qiao, Wen;Chen, Linsen
受商用空间光调制器(SLM)可刷新数据量的限制，电子全息术很难提供令人满意的3D实时视频。本文通过分离光场的相位信息和幅度信息，提出了一种基于全息术的多视角三维显示方法。本文采用5.5英寸4视位相板全覆盖像素化纳米光栅阵列记录位相信息。由于只需要更新幅度信息，因此显著减少了3D视频显示中的刷新数据量。使用像素尺寸为95微米的5.5英寸TFT-LCD以每秒20帧的速率调制光场的幅度信息。为了避免观察点之间的串扰，对相位板中每个纳米光栅的空间频率和方向进行了微调。结果，透射光会聚到观察点。角发散量测得平均为1.02度(半高宽)，略大于0.94度的衍射极限。通过刷新LCD，在4个观察点动态呈现了一系列动画序列3D图像。每个图像的分辨率为640x360。每个观察点的图像被很好地分开，没有观察到鬼影。通过采用另一种SLM，可以容易地提高3D动态显示中的图像分辨率和刷新率。录制的3D视频显示了所提出的全息3D显示器在移动电子产品中的巨大潜力。(C)2017年美国光学学会
Limited by the refreshable data volume of commercial spatial light modulator (SLM), electronic holography can hardly provide satisfactory 3D live video. Here we propose a holography based multiview 3D display by separating the phase information of a lightfield from the amplitude information. In this paper, the phase information was recorded by a 5.5-inch 4-view phase plate with a full coverage of pixelated nano-grating arrays. Because only amplitude information need to be updated, the refreshing data volume in a 3D video display was significantly reduced. A 5.5 inch TFT-LCD with a pixel size of 95 mu m was used to modulate the amplitude information of a lightfield at a rate of 20 frames per second. To avoid crosstalk between viewing points, the spatial frequency and orientation of each nano-grating in the phase plate was fine tuned. As a result, the transmission light converged to the viewing points. The angular divergence was measured to be 1.02 degrees (FWHM) by average, slightly larger than the diffraction limit of 0.94 degrees. By refreshing the LCD, a series of animated sequential 3D images were dynamically presented at 4 viewing points. The resolution of each view was 640 x 360. Images for each viewing point were well separated and no ghost images were observed. The resolution of the image and the refreshing rate in the 3D dynamic display can be easily improved by employing another SLM. The recoded 3D videos showed the great potential of the proposed holographic 3D display to be used in mobile electronics. (C) 2017 Optical Society of America