Back to results
US 11,150,468 B1Granted
Optical device having reduced diffraction artifacts for eye-tracking
AssigneeFacebook Technologies, LLC
InventorsYun-Han Lee, Lu Lu, Mengfei Wang, Fenglin Peng, Junren Wang
Life of this patent
Estimating the term…
Abstract
An optical device and an eye-tracking system to suppress a rainbow effect are provided. The optical device includes a grating. The grating includes at least one substrate and a grating structure coupled to the at least one substrate. The grating structure is configured to diffract an infrared light beam and transmit a visible light beam with a diffraction efficiency less than a predetermined threshold.
Claims14
An optical device, comprising:
- a grating including a birefringent material film configured with a birefringence gradient along a thickness direction of the birefringent material film, the birefringent material film being configured to diffract an infrared light and transmit a visible light with a diffraction efficiency that is less than a predetermined threshold.
An eye-tracking system, comprising:
- a light source configured to emit an infrared light to illuminate an eye;
- a grating including a birefringent material film configured with a birefringence gradient along a thickness direction of the birefringent material film, the birefringent material film being configured to diffract the infrared light reflected from the eye and transmit a visible light with a diffraction efficiency that is less than a predetermined threshold;
- and
- an optical sensor configured to receive the diffracted infrared light and generate an image of the eye based on the diffracted infrared light.
1 more element
Dependencies are inferred from the claim text.