Display device

A display device comprising:

• a substrate having a first surface on which a light emitting element is located and a second surface on which a driving unit for driving the light emitting element is located, the second surface being opposite the first surface;
• a first upper pad electrode on the first surface of the substrate and electrically connected to the light emitting element;
• a first insulating layer on the first upper pad electrode and having a first opening and a second opening exposing the first upper pad electrode;
• a first lower pad electrode on the second surface of the substrate and electrically connected to the driving unit;
• a second insulating layer on the first lower pad electrode and having a third opening and a fourth opening exposing the first lower pad electrode;
• and
• a side wiring electrically connecting the first upper pad electrode and the first lower pad electrode,
• wherein the side wiring comprises:
• a first side wiring in contact with a first portion of the first upper pad electrode exposed by the first opening and a portion of the first lower pad electrode exposed by the third opening;
• and
• a second side wiring spaced from the first side wiring and in contact with a second portion of the first upper pad electrode exposed by the second opening and a portion of the first lower pad electrode exposed by the fourth opening, and
• wherein the first portion and the second portion are electrically connected to each other.

A tiled display device comprising:

• a plurality of display devices and a connecting portion between the plurality of display devices,
• wherein a first display device of the plurality of display devices comprises:
• a substrate having a first surface on which a light emitting element is located, a second surface on which a driving unit for driving the light emitting element is located, the second surface being opposite the first surface, and a first side surface between the first surface and the second surface;
• a first pad on the first surface of the substrate and electrically connected to the light emitting element;
• a second pad on the second surface of the substrate and electrically connected to the driving unit;
• and
• a side wiring on the first surface, the second surface, and the first side surface of the substrate to electrically connect the first pad and the second pad,
• wherein the side wiring comprises a first side wiring and a second side wiring spaced from each other, and
• wherein the first pad comprises:
• a first inspection portion that does not overlap the side wiring;
• a first contact portion on one side of the first inspection portion and in contact with the first side wiring;
• and
• a second contact portion on one side of the first contact portion and in contact with the second side wiring.