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. 29, 2025
Filed:
Mar. 29, 2022
Sioptica Gmbh, Jena, DE;
André Heber, Weimar, DE;
Markus Klippstein, Jena, DE;
siOPTICA GmbH, Jena, DE;
Abstract
An illumination device for a display screen operable in an open-viewing mode Band a restricted-viewing mode Bwhere light is emitted in a limited angular range. It includes a backlight emitting the limited-angular-range light, a plate-shaped light guide with large surfaces and narrow connecting sides in front of the backlight in a viewing direction. The light guide has outcoupling elements on the surfaces or within its volume, and is at least 50% transparent to backlight light. Outcoupling elements have a function surface for coupling out light guide light. Illuminants are arranged laterally of the narrow sides. The backlight is on and the illuminants off in mode B, and the illuminants are on in mode B. Some outcoupling elements have a structure causing scattering in a preferential direction that is stronger by a factor of at least 1.2 than in a direction perpendicular to the preferential direction, yielding anisotropic scattering.