Free browsing mode and screen illumination device in restricted browsing mode

摘要

Problem to be solved: to provide a free viewing mode and a restricted viewing mode screen illumination apparatus which can be selected between a wide viewing angle for sharing the displayed information with another person and a narrow viewing angle necessary for keeping the displayed information private.Lighting device 1a isAt least two modes of operationB1 for free browsing mode and B2 for restricted browsing mode can be operated;Background illumination 2 of planar expansion that radiates light in a wide angle rangeThe light guide 3 is a plate-like light guide 3 positioned in front of the background illuminatorWithin at least one of the large surfaces and / or within the volumeMultiple outcoupling elements 6 andOptionally equipped with focusing elementsLight guide 3A light source 4 arranged laterally at least one edge of the light guideIs provided.Diagram