An active matrix organic electroluminescent device includes a substrate, a gate line on the substrate, a data line on the substrate, the data line crossing the gate line to define a pixel region, a first switching thin film transistor connected to the gate line and the data line, a first driving thin film transistor connected to the first switching thin film transistor, a power line connected to the first driving thin film transistor and parallel to the gate line, a capacitor electrode connected to the first driving thin film transistor and overlapping the power line, and a pixel electrode connected to the first driving thin-film transistor and covering the pixel region.