Meta Platforms Technologies, LLC

Hyunmin Song

Yun-Han Lee

Junren Wang

Lu Lu

Yusufu Njoni Bamaxam Sulai

Chulwoo Oh

Zhisheng Yun

Matthieu Charles Raoul Leibovici

Sascha Hallstein

Sanaz Alali

Pavel Trochtchanovitch

An optical assembly includes a first grating for redirecting a polychromatic light beam, e.g. for deviating light path of an optical system away from an optical train of some other optical sub-system. The first grating exhibits chromatic dispersion, resulting in imaging aberrations in the optical system relying on the first grating to deviate the light path. A second grating with lesser chromatic dispersion but closer to the imaging camera may be used to undo the chromatic dispersion induced blurring of the image caused by the first grating, resulting in sharpening of the final image.

Dispersion-compensated optical assembly and system

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.

Polarization volume hologram combiner enabling wide population coverage, eye tracking accuracy, and glint generation

A system includes a polarization selective optical element configured to diffract a light reflected by an object into a plurality of signal lights. The system also includes at least one optical sensor configured to receive the signal lights and generate a plurality of tracking signals for tracking the object.

Object tracking system including polarization selective optical element

An optical element is provided. The optical element includes an optical film including a birefringent material having a chirality. Optically anisotropic molecules of the birefringent material disposed adjacent a first surface of the optical film are configured with a first pretilt angle in a range of greater than 10&#xb0; and less than 80&#xb0;, or in a range of greater than &#x2212;80&#xb0; and less than &#x2212;10&#xb0;. Optically anisotropic molecules of the birefringent material disposed adjacent a second surface of the optical film opposing the first surface are configured with a second pretilt angle in the range of greater than 10&#xb0; and less than 80&#xb0;, or in the range of greater than &#x2212;80&#xb0; and less than &#x2212;10&#xb0;.

Optical device including optically anisotropic molecules having intermediate pretilt angles

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Menlo Park, CA, United States of America

Hyunmin Song