Display device and tiled display including the same

A display device comprising:

• a substrate comprising a display part, a pad part, and a bending part between the display part and the pad part;
• a display layer disposed on a first surface of the display part, the display layer comprising pixels;
• a pad electrode disposed on a first surface of the pad part;
• and
• a metal layer disposed on a second surface of the display part and on a second surface of the pad part, the second surface of the display part being opposite to the first surface of the display part, and the second surface of the pad part being opposite to the first surface of the pad part, wherein
• a planar shape of the bending part is determined by the metal layer,
• the substrate is disposed between the display layer and the metal layer in the display part,
• the substrate is a base member comprised of an insulating material selected from polyimide (PD) and polymer resin, and
• a thickness of the substrate in the bending part is smaller than a thickness of the substrate in each of the display part and the pad part.