Patent ID: 7623101

Claim:
A light emitting system comprising: a light emitting device including a light emitting element and a light sensor for detecting the luminous intensity of the light emitted from the light emitting element, said light emitting element including a lower electrode, a light emitting material layer including at least a light emitting layer, and an upper electrode having light transparency, which are formed on a substrate in the named order, one of said lower electrode and said upper electrode acting as a cathode, and the other acting as an anode, said light sensor being formed directly on said upper electrode of said light emitting element, said light sensor included in said light emitting device outputting the detection result of the luminous intensity as a current signal, a light sensor switching element for switching whether or not a biasing voltage is applied which enables to generate the current signal in proportion to the amount of the light received, said light sensor switching element being provided in the way of a bias voltage supplying line for said light sensor, a light sensor switching unit for controlling a switching operation of said light sensor switching element, said light sensor switching element being connected to said light sensor switching unit through a light sensor switching line.