Beam steering for virtual/augmented reality displays with a cycloidal diffractive waveplate
Beam steering for virtual/augmented reality displays with a cycloidal diffractive waveplate
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DOI：
10.1364/oe.24.007287
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发表时间：
2016-04-04
期刊：
影响因子：
3.8
通讯作者：
Wu, Shin-Tson
中科院分区：
文献类型：
--
作者：
Chen, Haiwei;Weng, Yishi;Wu, Shin-Tson
提出了一种用于虚拟现实（VR）或增强现实（AR）显示系统中的眼动跟踪的具有摆线衍射波片（CDW）的可切换光束控制设备。这种CDW以超过95%的效率将入射的圆偏振光衍射到一阶。为了将输入的线偏振光转换为右旋或左旋圆偏振，我们研制了一种由扭曲双折射液晶盒和消色差四分之一波长延迟膜组成的宽带偏振开关。通过将2-3个CDW级联在一起，可以实现多个衍射角。为了抑制色散，我们提出了两种方法来获得相同的衍射角的红色，绿色，和蓝色LED为基础的全色显示。该器件具有衍射效率高、响应速度快、功耗低、成本低等优点。它为新兴的VR/AR显示器带来了希望。(C)2016美国光学学会
We proposed a switchable beam steering device with cycloidal diffractive waveplate (CDW) for eye tracking in a virtual reality (VR) or augmented reality (AR) display system. Such a CDW diffracts the incident circularly polarized light to the first order with over 95% efficiency. To convert the input linearly polarized light to right-handed or left-handed circular polarization, we developed a broadband polarization switch consisting of a twisted nematic liquid crystal cell and an achromatic quarter-wave retardation film. By cascading 2-3 CDWs together, multiple diffraction angles can be achieved. To suppress the color dispersion, we proposed two approaches to obtain the same diffraction angle for red, green, and blue LEDs-based full color displays. Our device exhibits several advantages, such as high diffraction efficiency, fast response time, low power consumption, and low cost. It holds promise for the emerging VR/AR displays. (C) 2016 Optical Society of America