Polarization volume hologram combiner enabling wide population coverage, eye tracking accuracy, and glint generation
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United States of America
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Mar 18, 2025
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app pub date -
Oct 19, 2022
filing date -
Oct 19, 2022
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Abstract
Various embodiments set forth eye tracking systems. In some embodiments, an eye tracking system includes a polarization volume hologram (PVH) combiner having a rolling k-vector design that provides relatively wide coverage of users whose eyeglasses prescriptions can vary. The PVH combiner can further include (1) fiducial regions created by differential patterning that generate dark regions in images captured of an eye, and/or (2) multiple regions that diffract light at angles to produce different perspectives in the captured images. The dark regions and/or different perspectives can be used to calibrate eye tracking. In addition, the PVH combiner can include off-axis lens regions that generate glints for the eye tracking.
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