Display device, method of manufacturing the same, and tiled display device having the same

1. A display device comprising:

a substrate having a display area configured to display an image;

a pixel on a first surface of the substrate in the display area, the pixel comprising a display element layer and a pixel circuit layer;

a first driver on a second surface of the substrate facing the first surface of the substrate in the display area; and

a first connection portion passing through the substrate between the first surface and the second surface of the substrate in a first direction in the display area to electrically connect a first signal line of the pixel circuit layer and the first driver to each other,

wherein the display element layer comprises:

a first electrode and a second electrode on the same layer and spaced from each other such that the first electrode and the second electrode do not overlap each other in the first direction; and

a light emitting element between the first electrode and the second electrode.

2. The display device according to claim 1 , further comprising:

a second driver on the second surface of the substrate in the display area; and

a second connection portion passing through the substrate between the first surface and the second surface of the substrate to electrically connect a second signal line of the pixel circuit layer and the second driver to each other,

wherein the first driver is configured to supply a scan signal to the first signal line, and

wherein the second driver is configured to supply a data signal to the second signal line.

3. The display device according to claim 2 , wherein the pixel circuit layer further comprises a transistor electrically connected to the light emitting element,

wherein the transistor comprises:

a semiconductor layer on the first surface of the substrate;

a gate electrode on the semiconductor layer; and

a first transistor electrode and a second transistor electrode on the gate electrode and connected to the semiconductor layer, and

wherein the first signal line is on the same layer as the gate electrode.

4. The display device according to claim 3 , wherein the second signal line is on the same layer as at least one of the first transistor electrode and the second transistor electrode.

5. The display device according to claim 4 , wherein the pixel circuit layer further comprises an intermediate electrode contacting the second signal line and the second connection portion, and

wherein the intermediate electrode is on the same layer as the first signal line.

6. The display device according to claim 2 , further comprising a capping layer on the second surface of the substrate and covering the first connection portion and the second connection portion,

wherein the first connection portion comprises a first through electrode passing through the substrate and a first fan-out electrode on the second surface of the substrate,

wherein the second connection portion comprises a second through electrode passing through the substrate and a second fan-out electrode on the second surface of the substrate, and

wherein the capping layer has a first pad opening exposing a portion of the first fan-out electrode and a second pad opening exposing a portion of the second fan-out electrode.

7. The display device according to claim 6 , further comprising:

a first connection film electrically connected to the first fan-out electrode through the first pad opening; and

a second connection film electrically connected to the second fan-out electrode through the second pad opening,

wherein the first driver is on the first connection film, and

wherein the second driver is on the second connection film.

8. The display device according to claim 1 , wherein the display element layer comprises:

an insulating layer on the first electrode and the second electrode;

a third electrode contacting the first electrode and a first end portion of the light emitting element; and

a fourth electrode contacting the second electrode and a second end portion of the light emitting element,

wherein the insulating layer has a first opening exposing at least a portion of the first electrode and a second opening exposing at least a portion of the second electrode,

wherein the third electrode contacts the first electrode through the first opening, and

wherein the fourth electrode contacts the second electrode through the second opening.

9. The display device according to claim 1 , wherein the display element layer comprises:

a wavelength conversion layer on the light emitting element; and

a color filter layer on the wavelength conversion layer, and

wherein the wavelength conversion layer comprises a wavelength conversion particle and a scattering particle.

10. The display device according to claim 1 , wherein the light emitting element comprises an inorganic material, and

wherein the pixel comprises a plurality of the light emitting elements.

11. The display device according to claim 3 , wherein the first connection portion terminates on a same layer as the gate electrode, and

wherein the second connection portion extends above the gate electrode towards the display element layer.