Display device including a passivation layer having an uneven surface

1. A display device, comprising:

a substrate including a display area and a peripheral area disposed at an edge of the display area;

a transistor disposed on the display area of the substrate;

a pad portion disposed on the peripheral area of the substrate;

a passivation layer disposed on the transistor; and

a pixel definition. layer disposed on the passivation layer,

wherein a portion of the passivation layer extends to the peripheral area, an upper surface of the portion of the passivation layer disposed on the display area is substantially flat, an upper surface of the portion of the passivation layer disposed on the peripheral area has an uneven structure, the uneven structure includes a recess portion and a convex portion, wherein a plurality of first electrode are disposed on the recess portion of the uneven structure, and

the pixel definition layer covers the portion of the passivation layer disposed on the peripheral area.

2. The display device of claim 1 , further comprising

an organic light-emitting diode disposed on the passivation layer and connected to the transistor, wherein

the organic light-emitting diode includes:

a first electrode disposed on the passivation layer;

a light-emitting member disposed on the first electrode; and

a second electrode disposed on the light-emitting member,

wherein the plurality of first electrode particles include substantially the same material as the first electrode.

3. The display device of claim 2 , wherein the pad portion includes;

a first pad electrode;

a second pad electrode disposed adjacent to the first pad electrode; and

an auxiliary electrode disposed between the first pad electrode and the second pad electrode.

4. The display device of claim 3 , wherein

an interlayer insulating layer having a groove is disposed between the first pad electrode and the second pad electrode, and

the auxiliary electrode is disposed in the groove.

5. The display device of claim 4 , wherein the plurality of first electrode particles are disposed on the auxiliary electrode.

6. The display device of claim 5 , further comprising;

a first wire electrically connecting the first pad electrode and the display area;

a second wire electrically connecting the second pad electrode and the display area; and

an auxiliary wire electrically connecting the auxiliary electrode and the first wire,

wherein the first pad electrode is configured to receive a driving voltage.

7. The display device of claim 6 , further comprising

a covering layer disposed in the groove of the interlayer insulating layer, and

the covering layer includes substantially the same material as the pixel definition layer.

8. The display device of claim 7 , wherein

the transistor includes:

a semiconductor layer including a channel region, a source region, and a drain region;

a gate insulating layer disposed on the semiconductor layer;

a gate electrode disposed on the gate insulating layer;

a source electrode connected to the source region; and

a drain electrode separated. from the source electrode and connected to the drain region.,

wherein the first pad electrode includes a lower electrode layer disposed on the gate insulating layer, and

wherein the second pad electrode includes an upper electrode layer connected to the lower electrode layer and disposed on the interlayer insulating layer.

9. The display device of claim 8 , wherein

the auxiliary electrode is disposed on the gate insulating layer and includes substantially the same material as the lower electrode layer and the gate electrode.

10. The display device of claim 9 , wherein

the upper electrode layer includes substantially the same material as the source electrode and the drain electrode.