Eyebox expansion and exit pupil replication in wearable heads-up display having integrated eye tracking and laser projection
First Claim
Patent Images
1. A wearable heads-up display (“
- WHUD”
) comprising;
a support frame that in use is worn on a head of a user;
a laser module carried by the support frame, the laser module including an infrared laser diode to output an infrared light and at least one visible light laser diode to output a visible light;
a scan mirror carried by the support frame and aligned with an output of the laser module to receive both the infrared light and the visible light output by the laser module, the scan mirror to controllably reflect both the infrared light and the visible light;
an optical splitter aligned to;
receive both the infrared light and the visible light from the scan mirror;
transmit the infrared light therethrough without influencing the infrared light; and
separate the visible light into angle-separated copies;
a wavelength-multiplexed holographic optical element (“
HOE”
) carried by the support frame and positioned within a field of view of at least one eye of the user when the support frame is worn on the head of the user, the wavelength-multiplexed HOE aligned to receive both the infrared light and the angle-separated copies of the visible light from the optical splitter and to redirect both the infrared light and the angle-separated copies of the visible light towards the at least one eye of the user when the support frame is worn on the head of the user, wherein the wavelength-multiplexed-HOE includes a first hologram that is responsive to the angle-separated copies of the visible light and unresponsive to the infrared light and a second hologram that is responsive to the infrared light and unresponsive to the angle-separated copies of the visible light, and wherein the wavelength-multiplexed HOE is substantially transparent to environmental light; and
an infrared detector carried by the support frame and aligned to receive at least a portion of infrared light reflected from the at least one eye of the user when the support frame is worn on the head of the user.
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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.
153 Citations
12 Claims
-
1. A wearable heads-up display (“
- WHUD”
) comprising;a support frame that in use is worn on a head of a user; a laser module carried by the support frame, the laser module including an infrared laser diode to output an infrared light and at least one visible light laser diode to output a visible light; a scan mirror carried by the support frame and aligned with an output of the laser module to receive both the infrared light and the visible light output by the laser module, the scan mirror to controllably reflect both the infrared light and the visible light; an optical splitter aligned to; receive both the infrared light and the visible light from the scan mirror; transmit the infrared light therethrough without influencing the infrared light; and separate the visible light into angle-separated copies; a wavelength-multiplexed holographic optical element (“
HOE”
) carried by the support frame and positioned within a field of view of at least one eye of the user when the support frame is worn on the head of the user, the wavelength-multiplexed HOE aligned to receive both the infrared light and the angle-separated copies of the visible light from the optical splitter and to redirect both the infrared light and the angle-separated copies of the visible light towards the at least one eye of the user when the support frame is worn on the head of the user, wherein the wavelength-multiplexed-HOE includes a first hologram that is responsive to the angle-separated copies of the visible light and unresponsive to the infrared light and a second hologram that is responsive to the infrared light and unresponsive to the angle-separated copies of the visible light, and wherein the wavelength-multiplexed HOE is substantially transparent to environmental light; andan infrared detector carried by the support frame and aligned to receive at least a portion of infrared light reflected from the at least one eye of the user when the support frame is worn on the head of the user. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- WHUD”
Specification