ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,523,868, issued on Jan. 13, was assigned to Snap Inc. (Santa Monica, Calif.).
"Waveguide structure" was invented by Ian Marshall (Rochester, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical waveguide device for use in a head up display. The waveguide device provides pupil expansion in two dimensions. The waveguide device comprises a primary waveguide and a secondary waveguide, the secondary waveguide being positioned on a face of the primary waveguide. The secondary waveguide has a diffraction grating on a face opposite to the face which contacts the primary waveguide. The diffraction grating diffracts light into more than one dif...