Patent ID: 11892649
Assignee: GOOGLE LLC
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 9:
10. A method, comprising:
disposing, on a waveguide included in a frame of a head-mounted wearable device worn by a user, the frame also including a world-facing radiation detector and an gaze-tracking device configured to produce gaze-tracking radiation for measuring a gaze angle of a user's eye, the gaze-tracking radiation being reflected from the user's eye, an incoupler configured to couple the gaze-tracking radiation into the waveguide to produce radiation in the waveguide;
disposing, on the waveguide, an outcoupler configured to couple the radiation in the waveguide out of the waveguide to produce outcoupled radiation, the outcoupled radiation being emitted from the outcoupler in an output direction toward the world-facing radiation detector; and
disposing, in the frame, a radiation direction rerouter configured to adjust an angle of incidence of the radiation in the waveguide at a first surface of the waveguide to produce radiation directed at an adjusted angle of incidence at the outcoupler such that the output direction is essentially parallel to the gaze angle of the user's eye.