Beam Steering For Virtual/Augmented Reality Displays With A Cycloidal Diffractive Waveplate

Abstract

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.

Publication Date

4-4-2016

Publication Title

Optics Express

Volume

24

Issue

7

Number of Pages

7287-7298

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OE.24.007287

Socpus ID

84962865392 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84962865392

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