Patent ID: 9618179
Date: 2017-04-11
CPC Classifications: F21V,F21Y,G02F,H01L

Claim:
1. A lighting unit, comprising: an arrangement of a plurality of light source units configured to emit light; a first foil comprising a plurality of transmissive first foil regions, wherein each first foil region comprises a plurality of optical elements comprising an optical element with refractive functionality to the light source unit light in a center of each region and a different optical element with total internal reflection functionality to the light source unit light in a peripheral area remote from said center in each region; and a second foil comprising a plurality of transmissive second foil regions, wherein each second foil region comprises a plurality of optical elements wherein each second foil region comprises at its center an optical element with refractive functionality to the light source unit light and in a peripheral area remote from its center a different optical element with total internal reflection functionality to the light source unit light; wherein each light source unit has a corresponding first foil region configured downstream of said light source unit and a corresponding second foil region configured downstream of said first foil region.