Patent ID: 11914161
Assignee: LUMUS LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An apparatus, comprising:
a light-transmitting substrate having at least two parallel major surfaces for guiding light by internal reflection, a first of the major surfaces being deployed in facing relation to an eye;
an optical element associated with the first of the major surfaces, the optical element configured for selectively applying optical power to incident light in accordance with at least one property of the incident light that includes a polarization direction of the incident light, such that the optical element applies optical power to incident light returned from the eye that is polarized in a first polarization direction so as to collimate the incident light returned from the eye that is polarized in the first polarization direction and such that the optical element applies substantially no optical power to incident light coupled out of the light-transmitting substrate that is polarized in a second polarization direction orthogonal to the first polarization direction;
an optical coupling configuration associated with the light-transmitting substrate and configured for:
coupling-in a proportion of light returned from the eye that is polarized in the first polarization direction, collimated by the optical element and incident on the first of the major surfaces, so as to propagate within the light-transmitting substrate by internal reflection, and
coupling-out a proportion of light that is polarized in the second polarization direction propagating within the light-transmitting substrate;

optics associated with the light-transmitting substrate and configured for converting the collimated light that is polarized in the first polarization direction, propagating within the light-transmitting substrate by internal reflection, into converging beams of captured light;
an optical sensor deployed for sensing the captured light; and
at least one processor electrically associated with the optical sensor and configured to process signals from the optical sensor to derive a current gaze direction of the eye.