Systems and methods for eye tracking with spatially varying k-vectors
AssigneeMeta Platforms Technologies, LLC
InventorsGregory Olegovic Andreev, Gang Li, Changwon Jang
Life of this patent
Estimating the term…
Abstract
Systems and method for eye tracking are provided. In some embodiments, the eye tracking system includes a light source configured to generate light and project the light toward an object in a field of view, a detector configured to receive reflected portions of the light from the field of view in order to image the object, and a combiner including a volume grating configured to direct light reflected from different points in a field of view to the light detector. The volume grating includes a plurality of portions along a first area and each of the portions comprising a unique k-vector that is dependent on a respective portion of the field of view.
Claims20
A wearable device comprising:
- a light source configured to generate light and project the light into an eyebox of the wearable device;
- and
- a detector configured to receive a single bounce reflection of light from a volume grating on a medium, wherein the reflection is away from the medium, the volume grating configured to reflect the light from portions of the eyebox within a field of view to the detector, the volume grating comprising a plurality of portions along a longitudinal axis of a first area of the volume grating, each of the portions comprising a unique k-vector that is dependent on a respective portion of the field of view and a relative position of the detector such that the k-vector is closer to perpendicular with the longitudinal axis as a distance between the respective portion and the detector decreases.
A system for eye tracking comprising:
- a light source configured to generate light and project the light toward an object in a field of view;
- a detector configured to receive reflected portions of the light from the field of view in order to image the object;
- a volume grating configured to reflect impinging light reflected from different points in a field of view to the detector, the volume grating comprising a plurality of portions along a first area having a longitudinal axis, each of the portions comprising a unique k-vector that is dependent on a respective portion of the field of view and a relative position of the detector such that the k-vector is closer to perpendicular with the longitudinal axis as a distance between the respective portion and the detector decreases, wherein a path from the volume grating to the detector does not utilize total internal reflection in a medium associated with the grating.
A reflective volume grating, the reflective volume grating being for use in an eye tracking system, the reflective volume grating comprising:
- a plurality of grating elements along a longitudinal axis, the plurality of grating elements having a plurality of k-vectors along a first area, wherein each of the plurality of k-vectors along the first area are dependent on a respective portion of a field of view and a relative position of a detector such that the k-vector is closer to perpendicular with the longitudinal axis as a distance between the respective portion and the detector decreases and light reflected off an object at different points of the object in the field of view impinges the reflective volume grating and is directly reflected to the detector with a diffraction efficiency above eighty percent.
Dependencies are inferred from the claim text.