Patent ID: 7428367

Claim:
A collimating device comprising: a first transparent substrate having a first surface and a second surface, the first transparent substrate having an index of refraction; a plurality of wave guide structures provided in the first transparent substrate, the plurality of wave guide structures having an index of refraction different than the index of refraction of the first transparent substrate; a second transparent substrate having a first surface and a second surface wherein the first surface of the second transparent substrate is facing the first surface of the first transparent substrate, the second transparent substrate having an index of refraction; and a plurality of exit control structures provided in the second transparent substrate, the plurality of exit control structures having an index of refraction different than the index of refraction of the second transparent substrate; wherein the first surface of the first transparent substrate and the first surface of the second transparent substrate face each other such that each wave guide structure is generally aligned with each exit control structure thereby forming a collimating structure, wherein light emanating from a first direction facing the second surface of the first transparent substrate propagates through the first transparent substrate, between the plurality of wave guide structures, and is collimated as it exits adjacent collimating structures.