Patent ID: 7654681
Filing Date: 2010-02-02
Classification: C09K,F21V,F21Y,G02B

Abstract:
1. A surface light source device using light emitting diodes, the device comprising: a housing having a top opening to emit light; a light emitting diode board disposed on an inner bottom surface of the housing, the board on which a plurality of light emitting diodes are arranged; and a color conversion laminate formed by depositing a plurality of phosphor-mixed resin layers containing phosphors, the layers disposed above the plurality of light emitting diodes to be perpendicular to each other, the layers disposed at a top of the opening of the housing and providing light having different wavelength, wherein the plurality of phosphor-mixed resin layers are deposited in such a way that a first phosphor-mixed layer adjacent the plurality of light emitting diodes provides a relatively lower wavelength than a second phosphor-mixed layer adjacent the plurality of light emitting diodes, wherein the first phosphor mixed layer is closer to the plurality of light emitting diodes than the second phosphor-mixed layer.