Patent ID: 7635863
Filing Date: 2009-12-22
Classification: G02F,G09G,H01L

Abstract:
1. A display device comprising: a pixel comprising at least a first sub-pixel and a second sub-pixel, the first sub-pixel comprising a first light-emitting element and a first transistor, the second sub-pixel comprising a second light-emitting element and a second transistor, each of the first light-emitting element and the second light-emitting element comprising a first electrode and a second electrode; a monitoring element comprising a first electrode and a second electrode; a current source supplying a current to the monitoring element; and a buffer amplifier, wherein the first electrode of the monitoring element and the first electrodes of both the first light-emitting element and the second light-emitting element are connected to a power supply line; wherein the second electrode of the monitoring element is connected to an input terminal of the buffer amplifier, the second electrode of the first light-emitting element is connected to an output terminal of the buffer amplifier through the first transistor, and the second electrode of the second light-emitting element is connected to the output terminal of the buffer amplifier through the second transistor; wherein areas of the first light-emitting element and the second light-emitting element are different from each other; and wherein most of an area of the monitoring element is the same as an area of one of the first light-emitting element and the second light-emitting element.