US Patent 8956038 Lighting device having a light guide structure

A lighting device includes a light guide structure. The light guide structure is arranged in tiers by a plurality of thin-film modules in which a portion of a first surface of each lower one of the plurality of light guide layers is covered by an upper one of the plurality of light guide layers to form an uncovered portion of the first surface. Each of the thin-film modules is configured to transmit light therein emitted from light emitting diodes (LEDs) to the uncovered portion and emit the light from the uncovered portion of the first surface thereof.