Patent ID: 8328403

Claim:
An illumination device comprising: at least one light source; a light redirecting slab made of optically transmissive material and comprising an optical output surface and an array of optical redirecting elements, each of the optical redirecting elements having an optical coupling surface situated distally from the optical output surface and at least one light redirecting surface for receiving light from the optical coupling surface and redirecting the light received therefrom toward the optical output surface for emission therefrom; a substantially planar light guide slab made of an optically transmissive material and having a first surface, a second surface opposite the first surface and at least one input surface, the at least one input surface for receiving light from the at least one light source; and an array of optical apertures optically coupling the first surface of the light guide slab and the optical coupling surfaces of the light redirecting slab, the optical apertures formed by at least one deformed optical coupling element; wherein the first surface, the second surface and the at least one deformed optical coupling element are arranged one with respect to the other such that light entering the light guide slab is guided through the light guide slab via one or more reflections for insertion into the light redirecting slab.