Patent ID: 8260100

Claim:
A light guiding layer formed by an upper surface and a lower surface arranged substantially parallel to each other, the light guiding layer comprising an optical incoupling structure arranged within the light guiding layer and partitioning the light guiding layer into a first part and a second part, said optical incoupling structure having a slanted surface forming a first angle with a normal to the upper surface and the lower surface, wherein the first angle is selected such that a light incident to the slanted surface is given a first directional distribution by reflecting the light in a first general direction substantially parallel to the upper surface and the lower surface towards a reflecting structure, the reflecting structure being configured to give the light a second directional distribution by reflecting the light in a second general direction towards the optical incoupling structure, wherein the reflecting structure forms a second angle with the normal to the upper surface and the lower surface, the second angle is oblique and selected in dependence with the first angle such that at least a part of the light reflected in the second general direction is transmitted through the slanted surface of the optical incoupling structure into the second part of the light guiding layer.