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. 04, 2025
Filed:
May. 18, 2018
Dispelix Oy, Espoo, FI;
Kasimir Blomstedt, Espoo, FI;
Dispelix Oy, Espoo, FI;
Abstract
The invention concerns a diffractive element, a method of producing a viewable image and an optical device. The element comprises a waveguide and a diffractive out-coupling region arranged on a surface or inside the waveguide, the out-coupling region comprising a plurality of sub-regions arranged laterally with respect to each other and being adapted to couple light propagating in the waveguide out of the waveguide. According to the invention, the sub-regions each comprise a doubly periodic grating pattern having a first period in a first direction and a second period in a second direction different from the first direction, and wherein there are at least two sub-regions having different grating patterns. The invention allows for combining out-coupling and exit pupil expansion on a single region of a waveguide.