Patent ID: 8292473

Claim:
A light-emitting panel having at least one light-entrance edge for coupling light from a light source into the light-emitting panel, the light-emitting panel comprising a plate-like translucent member having a light-emitting front side and, parallel thereto, a rear side defining a plurality of cavities for outcoupling light by specular reflection from surfaces of the cavities, wherein each cavity comprises a side wall filler element in contact with a major portion of the side wall of the cavity, and a bottom extending at an angle to said rear side, such that there is a distance between the filler element and the bottom of the cavity, wherein the surface of the side wall of the cavity has a conical shape which tapers from said rear side into the material of the plate-like member, while the axis of the cone is perpendicular to said rear side, and the apex angle of the cone is smaller than 20° .