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US 9,456,744 B2Granted
Apparatus for eye tracking
AssigneeDigiLens Inc.
InventorsMilan Momcilo Popovich, Jonathan David Waldern, Alastair John Grant
Life of this patent
Estimating the term…
Abstract
An eye tracker having a waveguide for propagating illumination light towards an eye and propagating image light reflected from at least one surface of an eye, a light source optically coupled to the waveguide, and a detector optically coupled to the waveguide. Disposed in the waveguide is at least one grating lamina for deflecting the illumination light towards the eye along a first waveguide path and deflecting the image light towards the detector along a second waveguide path.
Claims20
An eye tracker waveguide comprising:
- a light detector;
- an imaging grating comprising an array of switchable grating elements configured along a first waveguide path;
- an output grating;
- and
- an image sampling grating overlaying said output grating, comprising an array of switchable grating elements configured along a second waveguide path orthogonal to said first waveguide path,
- wherein said switchable grating elements are switchable between a diffracting state and a non-diffracting state and one grating element of each of said imaging grating and said image sampling grating is in said diffracting state at any time,
- wherein an instantaneous detection aperture of said waveguide is addressed by an image sampling grating element in said diffracting state and an imaging grating element in said diffracting state,
- wherein light reflected from said eye is coupled into said waveguide via said detection aperture into said first waveguide path, is coupled out of said first waveguide path by said output grating, and is coupled into said second waveguide path towards said detector by an image sampling grating element in said diffracting state.
5 more elements
Dependencies are inferred from the claim text.