Patent ID: 7946724
Filing Date: 2011-05-24
Classification: G02F,G09G

Abstract:
1. A surface light source using white light emitting diodes comprising: a plurality of white light emitting diodes arranged at a predetermined distance from one another, wherein the white light emitting diodes are arranged such that a light emitting diode unit defined by each of the white light emitting diodes and corresponding ones of the white light emitting diodes disposed at a closest distance from the each white light emitting diode has a central light amount ranging from 80% to 120% with respect to an average light amount of the white light emitting diodes, and each of the white emitting diodes comprises a blue light emitting diode chip having a dominant wavelength of 430 to 456 nm, a red phosphor emitting red light and a green phosphor emitting green light, wherein the red light emitted from the red phosphor has a color coordinate falling within a space defined by four coordinate points (0.6448, 0.4544), (0.8079, 0.2920), (0.6427, 0.2905) and (0.4794, 0.4633) based on the CIE 1931 chromaticity diagram, and the green light emitted from the green phosphor has a color coordinate falling within a space defined by four coordinate points (0.1270, 0.8037), (0.4117, 0.5861), (0.4197, 0.5316) and (0.2555, 0.5030) based on the CIE 1931 chromaticity diagram.