The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 2023
Filed:
Nov. 09, 2020
Applicant:
Shanghai North Ocean Photonics Co., Ltd., Shanghai, CN;
Assignee:
Other;
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/124 (2006.01); G02B 27/00 (2006.01); G02B 27/01 (2006.01);
U.S. Cl.
CPC ...
G02B 6/124 (2013.01); G02B 27/0081 (2013.01); G02B 27/0101 (2013.01); G02B 2027/0125 (2013.01);
Abstract
A planar optical waveguide based on two-dimensional grating includes an optical waveguide substrate which is a transparent plane-parallel plate, and a functional grating element which includes a two-dimensional grating having two grating directions with an angle of 60° in between. The two-dimensional grating is either protruded or recessed into the top surface of the optical waveguide substrate. The output image from a micro-projector can enter the optical waveguide and then gets projected to cover the entire area of the functional grating element, enabling a human eye to view the output image across a large eye-box.