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:
Apr. 28, 2026
Filed:
Oct. 27, 2021
Nokia Technologies Oy, Espoo, FI;
Marja Salmimaa, Tampere, FI;
Toni Jarvenpaa, Akaa, FI;
Nokia Technologies Oy, Espoo, FI;
Abstract
An apparatus for controlling brightness of images includes: a first light guide including an in-coupling diffraction grating configured to in-couple input beams of light from a first light engine, an expanding grating configured to expand the input beams of light, and an out-coupling diffraction grating configured to out-couple the expanded beams of light; and a second light guide including at least; an in-coupling diffraction grating configured to in-couple input beams of light from a second light engine, an expanding grating configured to expand the input beams of light, and an out-coupling diffraction grating configured to out-couple the expanded beams of light. The out-coupling diffraction grating of the first light guide at least partially overlaps the out-coupling diffraction grating of the second light guide so that images are overlaid to control brightness of images provided by the apparatus.