Patent ID: 9185771
Filing Date: 2015-11-10
Classification: G09G,H01L,H05B,Y02B

Abstract:
1. A light emitting device comprising: a plurality of organic EL elements each of which is supplied with a current, and emits light; a constant current circuit that supplies a current to each of the organic EL elements; a reverse bias voltage circuit that applies a reverse bias voltage to each of the organic EL elements, and a switch circuit that connects the plurality of organic EL elements in series with the constant current circuit during emission of light, and connects the plurality of organic EL elements in parallel with the reverse bias voltage circuit during application of reverse bias voltage, wherein first and second organic EL elements are provided and a cathode of the first organic EL element is connected with an anode of the second organic EL element, the switch circuit comprise a first switch that connects an anode of the first organic EL element to the constant current circuit or an earth potential a second switch that switches connection and disconnection between a cathode of the first organic EL element and an anode of the second organic EL element, and a first potential of the reverse bias voltage circuit, and a third switch that connects a cathode of the second organic EL element to a second potential higher than the first potential of the reverse bias voltage circuit or the earth potential, the switch circuit connects the first switch to the constant current circuit disconnects the second switch and connects the third switch to the earth potential during emission of light, and the switch circuit connects the first switch to the earth potential connects the second switch, and connects the third switch to the second potential during application of reverse bias volt.