A display device for preventing a defective drive and improving reliability is disclosed. The display device includes a substrate including a display portion and a pad portion outside the display portion, a plurality of power lines positioned on the pad portion of the substrate and extended from the display portion, a plurality of data lines positioned in parallel with the plurality of power lines and extended from the display portion, and a plurality of bridge electrodes configured to connect at least two of the plurality of power lines. Some of the plurality of power lines include a power pad electrode on at least an end of the corresponding power line, and a number of the power pad electrodes is less than a number of the power lines.