Patent ID: 8154192

Claim:
A lighting system comprising: a first light emitting element including: a plurality of light emitting units formed between a first pair of electrodes; and a charge generation layer formed between the plurality of light emitting units, wherein the plurality of light emitting units have different emission colors from each other and are electrically connected in series through the charge generation layer; a second light emitting element comprising a light emitting unit between a second pair of electrodes, wherein emission color of the second light emitting element is substantially the same as emission color of one of the plurality of light emitting units which has the shortest lifetime among the plurality of light emitting units; and a control circuit, wherein the control circuit is arranged to suppress a change in total luminance of the first light emitting element and the second light emitting element by intensifying a luminance of the second light emitting element in accordance with a change in luminance of the first light emitting element.