Display device and manufacturing method thereof

A display device comprising:

• pixels that are arranged in a display area in a first direction and a second direction and that include first electrodes separated from each other and light emitting elements electrically connected to the first electrodes;
• second electrodes that are arranged in the first direction and are electrically connected to the light emitting elements of the pixels arranged in the second direction;
• a third electrode entirely disposed on the second electrodes and electrically connected to the second electrodes;
• and
• a first pad part that includes:
• a first pad and a first power pad electrically connected to the first electrodes via different circuit elements;
• and
• a second power pad electrically connected to the third electrode.

A manufacturing method of a display device, comprising:

• applying a voltage of a first power source to first electrodes of the display device through a first pad of the display device;
• applying a voltage of a second power source to second electrodes of the display device through second pads of the display device;
• and
• detecting a current flowing in each of the second pads, wherein
• while sequentially applying the voltage of the first power source to the first electrodes arranged in a second direction, a current flowing in each of the second electrodes is individually detected through the second pads, so that defects caused by light emitting elements of the display device are detected,
• the first electrodes are arranged in a first direction and the second direction,
• the second electrodes are arranged in the first direction and disposed on the light emitting elements arranged in the second direction,
• the first pad is electrically connected to the first electrode, and
• the second pads are electrically connected to the second electrodes.