Patent ID: 7995261

Claim:
A backlight for a display comprising: (a) a light source for generating light, (b) an optical waveguide for receiving and distributing said light, comprising: a refractive index nl, an upper surface, and a lower surface converging with said upper surface, and (c) a first optical layer having a refractive index n 2 , a plurality of embedded light reflecting facets, a light exit surface, and a light input surface optically coupled to said upper surface of said optical. waveguide via a second optical layer having a refractive index n 3 which is less than said refractive index n 1 and said refractive index n 2 and greater than 1, wherein most light rays entering from said light input surface of said first optical layer reflect light exit surface and light rays exit said first optical layer from said light exit surface by reflecting from said embedded light reflecting facets.