Patent ID: 8044426

Claim:
A light emitting device comprising: a first substrate comprising a contact region and a pixel region; signal lines which are arranged on the first substrate to define the contact region and the pixel region, the signal lines comprising a plurality of scan lines, a first power line, and a second power line; a gate insulating layer which is disposed on the signal lines, the gate insulating layer comprising a first via-hole exposing a portion of the first power line, and a second via-hole exposing a portion of the second power line; a first contact layer disposed on the contact region of the gate insulating layer; a semiconductor layer disposed on the pixel region of the gate insulating layer; a second contact layer disposed on the first contact layer; a source electrode and a drain electrode disposed on portions of the semiconductor layer; a first metal line directly connecting a surface of the second contact layer with the first power line through the first via-hole; and a second metal line connecting the source electrode with the second power line through the second via-hole, wherein a combined thickness of the first contact layer and the second contact layer is substantially the same as a combined thickness of the semiconductor layer and the source electrode or the drain electrode, and wherein the surface of the second contact layer that directly connects the first metal line is separate from the first contact layer.