Patent ID: 7609236
Filing Date: 2009-10-27
Classification: G09G,H01L

Abstract:
1. A display device comprising: a pixel portion formed over a substrate, the pixel portion having a light emitting element, wherein the light emitting element comprises a first electrode and a second electrode with a light emitting material interposed therebetween; a monitoring light emitting element electrically connected to the light emitting element through a power source line; and a plurality of constant current sources, wherein the monitoring light emitting element comprises the light emitting material interposed between a pair of electrodes, wherein any one of the plurality of constant current sources is electrically connected to the monitoring light emitting element through a switch, and wherein a brightness change of the light emitting element caused by a temperature change of the light emitting material interposed between the first electrode and the second electrode is suppressed by using the monitoring light emitting element.