ALEXANDRIA, Va., June 9 -- United States Patent no. 12,287,506, issued on April 29, was assigned to siOPTICA GmbH (Jena, Germany).
"Lighting device for a free viewing mode and a restricted viewing mode" was invented by Andre Heber (Weimar, Germany) and Markus Klippstein (Jena, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "An illumination device for a display screen operable in an open-viewing mode B1 and a restricted-viewing mode B2 where 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 outcoupli...