Patent ID: 8439546
Filing Date: 2013-05-14
Classification: G02B,Y10T

Abstract:
1. A lighting apparatus, comprising: an at least partially transparent panel including a planar front surface and a planar back surface, the panel configured to receive light provided from a light source through an edge of the panel and propagate the light within the panel; a film positioned on the back surface, the film having a plurality of light extraction dots disposed thereon, the plurality of light extraction dots configured to extract light propagating in the panel through the front surface; and a light source, wherein the light source is configured to switch between at least a first mode and a second mode, the light source emitting more light in the second mode than in the first mode; wherein the plurality of light extraction dots are configured to extract more light in the second mode than in the first mode such that the visibility through the at least partially transparent panel is greater in the first mode than in the second mode.