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:
Jul. 14, 2020
Filed:
Jun. 28, 2018
Sioptica Gmbh, Jena, DE;
André Heber, Weimar, DE;
Uwe Schroeter, Dornburg-Camburg, DE;
Juergen Schwarz, Apolda, DE;
Ambrose Peter Nari, Jena, DE;
Markus Klippstein, Jena, DE;
Stepan Alkhimenko, Jena, DE;
siOPTICA GmbH, Jena, DE;
Abstract
An illuminating apparatus for a screen operable in at least two operating modes, viz Bfor a free viewing mode and Bfor a restricted viewing mode. The illuminating apparatus comprising: a backlight with a planar extension radiating light in a restricted angular range; a plate-shaped light guide that is, in a viewing direction, arranged in front of the backlight and with outcoupling elements one of the large surfaces and/or within its volume. The light guide is transparent to at least 70% of the light emitted by the backlight and light sources are arranged laterally at the edges of the light guide. Various parameters are specified for the number of outcoupling elements per unit area and for their extension, and in operating mode B, the backlight is switched on and the light sources are switched off. In operating mode Bat least the light sources are switched on.