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WAVEGUIDE EYE TRACKING EMPLOYING SWITCHABLE DIFFRACTION GRATINGS

  • US 20160085300A1
  • Filed: 09/24/2014
  • Published: 03/24/2016
  • Est. Priority Date: 09/24/2014
  • Status: Active Grant
First Claim
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1. An apparatus for use in tracking an eye that is illuminated by infrared light having an infrared wavelength, the apparatus comprising:

  • a waveguide that is transparent and includes an input-coupler and an output-coupler;

    the input-coupler comprising a stack of two or more electronically switchable diffractive gratings arranged parallel to one another;

    wherein each of the electronically switchable diffractive gratings has a respective lens power and a respective prismatic power;

    wherein the lens power of each of the electronically switchable diffractive gratings differ from one another such that each of the electronically switchable diffractive gratings has a different focal length; and

    wherein each of the electronically switchable diffractive gratings, when turned on, is adapted to receive infrared light having the infrared wavelength and couple the received infrared light into the waveguide.

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