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US 11,448,883 B2Granted
Non-linear angular momentum metasurface
AssigneeMicrosoft Technology Licensing, LLC
InventorsBernard Charles Kress, Ishan Chatterjee
Life of this patent
Estimating the term…
Abstract
This document relates to an optical device using waveguide that can enable propagation of large field of view images by use of metasurfaces, without the necessity of increasing the reflective index associated with the waveguide. The metasurfaces can further provide image distortion correction to images to account for possible distortion introduced by an optical assembly. The metasurfaces can also be used to create a foveated image, in order to achieve a larger field of view for the image.
Claims20
A device comprising:
- a waveguide configured to propagate images up to a given field of view (FOV) from an in-coupler to an out-coupler via total internal reflection (TIR);
- an optical assembly configured to generate a compressed image having a compressed FOV that is less than the given FOV based on an original image having an original FOV that is greater than the given FOV;
- and,
- the out-coupler configured to provide a non-linear momentum change that expands the compressed image to output a foveated image having an output FOV that is greater than the given FOV and having different resolutions at different portions of the foveated image.
1 more element
A method comprising:
- identifying an original image for presentation to a user, the original image having an original field of view (FOV) greater than can be transmitted through a waveguide by total internal reflection (TIR);
- generating a compressed image based on the original image, the compressed image having a compressed FOV that can be transmitted through the waveguide by TIR;
- directing the compressed image into the waveguide through an in-coupler of the waveguide;
- and,
- receiving the compressed image from the waveguide at an out-coupler of the waveguide that is positioned in front of an expected position of an eye of the user, the out-coupler configured to provide a non-linear momentum change that expands the compressed image to output a foveated image having an output FOV greater than can be transmitted through the waveguide by TIR and having different resolutions at different portions of the foveated image.
2 more elements
A device comprising:
- a waveguide configured to propagate images up to a given field of view (FOV) from an in-coupler to an out-coupler via total internal reflection (TIR);
- an optical assembly configured to receive image data relating to an original image having an original FOV greater than the given FOV and to generate a compressed image having a compressed FOV that is less than the given FOV, the compressed image corresponding to the original image;
- and,
- the waveguide configured to receive the compressed image at the in-coupler and to transmit the compressed image through the waveguide to the out-coupler, the out-coupler configured to provide a non-linear momentum change that expands the compressed image to output a foveated image having an output FOV that is greater than the given FOV and having different resolutions at different portions of the foveated image.
1 more element
Dependencies are inferred from the claim text.