Patent ID: 7965351

Claim:
A planar light source comprising a plurality of light-emitting elements, wherein: each of the plurality of light-emitting elements is comprised of a combination of a semiconductor light-emitting element for emitting primary light and fluorescent substances for absorbing the primary light and emitting secondary light having a longer wavelength than the primary light, each of the plurality of light-emitting elements emitting combination light of the primary light and the secondary light, said each of the plurality of light-emitting elements, provided in at least a partial area of the planar light source, belongs to a first chromaticity group or a second chromaticity group on a basis of chromaticity of the combination light, (i) a difference between chromaticity of light-emitting elements belonging to the first chromaticity group and a target chromaticity and (ii) a difference between chromaticity of light-emitting elements belonging to the second chromaticity group and the target chromaticity are substantially equal and are away from the target chromaticity in directions reverse to each other, respectively, and the light-emitting elements belonging to the first chromaticity group and the light-emitting elements belonging to the second chromaticity group are alternately provided, in said at least a partial area, in a longitudinal direction and a transverse direction, respectively.