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. 02, 2021
Filed:
Mar. 27, 2020
Applicant:
Shanghai North Ocean Photonics Co., Ltd., Shanghai, CN;
Assignee:
Shanghai North Ocean Photonics Co., Ltd., Shanghai, CN;
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/34 (2006.01); G02B 27/01 (2006.01);
U.S. Cl.
CPC ...
G02B 6/34 (2013.01); G02B 27/0172 (2013.01); G02B 2027/0178 (2013.01);
Abstract
An optical waveguide includes an input diffractive optical element arranged for being aligned with an optical projector for diffracting light beams therefrom, a waveguide substrate, and an output diffractive optical element. Light diffracted by the output diffractive optical element is projected out of the waveguide substrate towards users' eyes. The output diffractive optical element has an effective area arranged to maintain a constant output flux per unit area therein for providing an uniform brightness of the light when the light is being projected out of the waveguide substrate.