Patent ID: 8643312

Claim:
A method for feeding electric power to a planar light-emitting element which includes a single light emission surface, a single planar anode electrode, a planar cathode electrode, a light-emitting layer provided between the single planar anode electrode and the planar cathode electrode, two or more anode terminal portions protruding from the single planar anode electrode and one or more cathode terminal portions protruding from the planar cathode electrode, comprising: sequentially providing the electric power only to the two or more anode terminal portions protruding from the single planar anode electrode to thereby adjust a luminance distribution of the single light emission surface, wherein each of the planar anode electrode and the planar cathode electrode has a rectangular shape and the planar light-emitting element includes four anode terminal portions provided at four sides of the planar anode electrode and four cathode terminal portions provided at four corners of the planar cathode electrode.