Patent ID: 8188942

Claim:
A light emitting device, comprising: a substrate; a display unit on the substrate, the display unit including a plurality of subpixels; a plurality of signal lines on the substrate, the signal lines including scan lines, power supply lines, and ground lines which are coupled to the plurality of subpixels; a pad unit positioned at an edge of the substrate, the pad unit including a driver supplying driving signals to the signal lines, a first end, and a second end at a location opposing the first end; and first and second dummy pad units adjacent respective ones of the first and second ends of the pad unit and disposed in a non-overlapping relationship with the pad unit, wherein: each of the first and second dummy pad units is coupled to signal lines included in the plurality of signal lines on the substrate, the first dummy pad unit applies first aging signals to subpixels coupled to a first set of the signal lines, and the second dummy pad unit applies second aging signals to subpixels coupled to a second set of the signal lines, each of the first and second aging signals changing a state of a transistor in a corresponding one of the subpixels.