公开(公告)号：US20190171006A1

公开(公告)日：2019-06-06

申请号：US16258088

申请日：2019-01-25

Applicant: NORTH INC.

Inventor： Idris S. Aleem ,  Mélodie Vidal ,  Jake Chapeskie

IPC: G02B27/00 ,  G02B27/01 ,  G02B26/10 ,  G02B5/32

Abstract: Systems, devices, and methods for laser eye tracking are described. Laser eye tracking involves scanning laser light over the eye and detecting diffuse reflections of the laser light with one or more photodetector(s). While conventional camera-based eye tracking techniques rely on detecting and identifying specific reflections (i.e., Purkinje images such as the “glint”), the laser eye tracking techniques described herein detect and identify a reduction in reflection intensity due to transmission of laser light through the pupil and/or increased diffusivity of reflections from the cornea relative to reflections from the sclera. This effect is referred to herein as the “corneal shadow” effect. Laser eye tracking uses considerably less power than conventional camera-based eye tracking techniques. As a result, the laser eye tracking techniques described herein do not add significant power demands to a system and can be implemented in wearable heads-up displays without adding significant volume to the system battery.

公开(公告)号：US10606072B2

公开(公告)日：2020-03-31

申请号：US16258088

申请日：2019-01-25

Applicant: NORTH INC.

Inventor： Idris S. Aleem ,  Mélodie Vidal ,  Jake Chapeskie

IPC: G01J5/02 ,  G02B27/00 ,  G02B27/01 ,  G02B5/32 ,  G02B26/10 ,  G06F3/01 ,  G06K9/00

Abstract: Systems, devices, and methods for laser eye tracking are described. Laser eye tracking involves scanning laser light over the eye and detecting diffuse reflections of the laser light with one or more photodetector(s). While conventional camera-based eye tracking techniques rely on detecting and identifying specific reflections (i.e., Purkinje images such as the “glint”), the laser eye tracking techniques described herein detect and identify a reduction in reflection intensity due to transmission of laser light through the pupil and/or increased diffusivity of reflections from the cornea relative to reflections from the sclera. This effect is referred to herein as the “corneal shadow” effect. Laser eye tracking uses considerably less power than conventional camera-based eye tracking techniques. As a result, the laser eye tracking techniques described herein do not add significant power demands to a system and can be implemented in wearable heads-up displays without adding significant volume to the system battery.

公开(公告)号：US10534182B2

公开(公告)日：2020-01-14

申请号：US16126564

申请日：2018-09-10

Applicant: NORTH INC.

Inventor： Stefan Alexander ,  Jake Chapeskie ,  Lloyd Frederick Holland ,  Thomas Mahon

IPC: G02B27/01 ,  G06F3/01 ,  G02B5/32 ,  G02B26/08 ,  G02B27/00 ,  H04N9/31

Abstract: Systems, devices, and methods that integrate eye tracking capability into scanning laser projector (“SLP”)-based wearable heads-up displays are described. An infrared laser diode is added to an RGB SLP and an infrared photodetector is aligned to detect reflections of the infrared light from features of the eye. A holographic optical element (“HOE”) may be used to combine visible light, infrared light, and environmental light into the user's “field of view.” The HOE may be heterogeneous and multiplexed to apply positive optical power to the visible light and zero or negative optical power to the infrared light.