Patent ID: 9519184
Filing Date: 2016-12-13
CPC Classification: F21K,G02F,H05K

Claim Text:
1. A lighting device comprising: a plurality of light emitting diode (LED) chips that emit light; a plurality of LED modules each having a printed circuit board (PCB) which supports and drives the plurality of LED chips projecting from top surfaces of the printed circuit board; and an optical sheet that is attached to the to surface of each printed circuit board included in each of the plurality of LED modules, respectively, wherein each of the optical sheets have a same size as each of the printed circuit boards or a smaller size than each of the printed circuit boards, respectively, wherein the plurality of LED chips are divided into a plurality of blocks which are separated from each other through printing circuit patterns in a circuit manner so as to be independently turned on/off, and wherein the plurality of LED modules include a plurality of white LED chips, the plurality of white LED chips each include a blue LED, a red phosphor, and a green phosphor to emit white light, color coordinates of red light emitted from the red phosphor are positioned within a region surrounded by four vertexes of (0.6448, 0.4544), (0.8079, 0.2920), (0.6427, 0.2905) and (0.4794, 0.4633) on the basis of the CIE 1931 color coordinate system, and color coordinates of green light emitted from the green phosphor are positioned within a region surrounded by four vertexes of (0.1270, 0.8037), (0.4117, 0.5861), (0.4197, 0.5318), and (0.2555, 0.5030).