Patent ID: 8946609
Filing Date: 2015-02-03
Classification: F21K,F21V,F21Y,G01D,G01J,G09F,G09G,H04N

Abstract:
1. A lighting panel, comprising: at least one substrate having a first side parallel to a principal plane of the lighting panel; a plurality of solid state lighting devices arranged on the first side of the at least one substrate and configured to emit light; a reflector sheet on the first side of the at least one substrate, wherein the reflector sheet comprises a lambertian reflector configured to reflect and scatter light incident thereon in a range of directions; a brightness enhancement film on the reflector sheet, wherein the reflector sheet is arranged between the at least one substrate and the brightness enhancement film and the brightness enhancement film is configured to preferentially emit light having a first orientation from the lighting panel and to preferentially reflect light having a second orientation, different from the first orientation, back into the lighting panel, and a generally planar diffuser sheet between the reflector sheet and the brightness enhancement film, wherein the light having the second orientation that is reflected back into the lighting panel is recycled within at least the diffuser sheet.