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US 12,204,136 B2Granted
Optical combiner with uniform illuminance throughput
AssigneeMeta Platforms Technologies, LLC
InventorsYun-Han Lee, Lu Lu, Mengfei Wang, Fenglin Peng, Junren Wang, Oleg Yaroshchuk, Yingfei Jiang, Babak Amirsolaimani, Scott Charles McEldowney
Life of this patent
Estimating the term…
Abstract
A device includes a display configured to generate an image light. The device also includes a waveguide optically coupled with the display and configured to guide the image light to an exit pupil of the device. The waveguide includes a grating including a birefringent material, and a birefringence of the grating is configured to increase along a pupil-expanding direction of the device.
Claims16
A device, comprising:
- a display configured to generate an image light;
- and
- a waveguide optically coupled with the display and configured to guide the image light to an exit pupil of the device,
- wherein the waveguide comprises a grating including a birefringent material, and a birefringence of the grating is configured to increase along a pupil-expanding direction of the device.
1 more element
A device, comprising:
- a display configured to generate a first image light;
- and
- a waveguide optically coupled with the display and comprising:
- an in-coupling element configured to couple the first image light into the waveguide as a second image light that propagates inside the waveguide via total internal reflection;
- and
- an out-coupling element configured with a predetermined diffraction efficiency gradient along a pupil-expansion direction of the device,
- wherein as the second image light propagates inside the waveguide via total internal reflection, the out-coupling element is configured to diffract, in the predetermined diffraction efficiency gradient, the second image light incident onto a plurality of portions of the out-coupling element with the same incidence angle out of the waveguide as a plurality of parallel third image lights,
- wherein the out-coupling element includes a birefringent material, and is configured with a predetermined birefringence gradient along the pupil-expansion direction.
5 more elements
A device, comprising:
- a display configured to generate a first image light;
- and
- a waveguide optically coupled with the display and comprising:
- an in-coupling element configured to couple the first image light into the waveguide as a second image light that propagates inside the waveguide via total internal reflection;
- and
- an out-coupling element configured with a predetermined diffraction efficiency gradient along a pupil-expansion direction of the device,
- wherein as the second image light propagates inside the waveguide via total internal reflection, the out-coupling element is configured to diffract, in the predetermined diffraction efficiency gradient, the second image light incident onto a plurality of portions of the out-coupling element with the same incidence angle out of the waveguide as a plurality of parallel third image lights,
- wherein the out-coupling element includes a birefringent material, and is configured with a predetermined thickness gradient along the pupil-expansion direction, and
- wherein the predetermined thickness gradient is configured to increase along the pupil-expansion direction.
6 more elements
Dependencies are inferred from the claim text.