Display device

1. A display device, comprising:

a substrate comprising a display area, a peripheral area disposed at a periphery of the display area, and a pad area disposed in the peripheral area;

a first voltage line disposed in the peripheral area between a first side of the display area and the pad area;

a second voltage line disposed at other sides of the display area; and

an isolated dam disposed between the display area and the pad area,

wherein the first voltage line comprises a first main voltage line and a first connection unit, wherein the first connection unit protrudes from the first main voltage line and extends toward the pad area,

wherein the second voltage line comprises a second main voltage line and a second connection unit, wherein the second connection unit protrudes from the second main voltage line and extends toward the pad area,

wherein the isolated dam extends substantially parallel to the first main voltage line, and

wherein the isolated dam is disposed between the first connection unit and the second connection unit, a first end of the isolated dam overlaps the first connection unit, and a second end of the isolated dam that opposes the first end overlaps the second connection unit

wherein the first end of the isolated dam comprises a first side surface connecting an upper surface of the isolated dam to a lower surface of the isolated dam, and the second end of the isolated dam comprises a second side surface opposing the first side surface and connecting the upper surface of the isolated dam to the lower surface of the isolated dam.

2. The display device of claim 1 , wherein the island dam is disposed on a layer lower than the first voltage line and the second voltage line.

3. The display device of claim 1 , further comprising:

a thin film transistor disposed in the display area;

a display element electrically connected to the thin film transistor;

a planarization insulating layer disposed between the thin film transistor and the display element;

a first dam disposed in the peripheral area; and

a second dam disposed in the peripheral area, wherein the first dam and the second dam are separate from the planarization insulating layer,

wherein the isolated dam overlaps at least one of the first dam and the second dam.

4. The display device of claim 3 , wherein the isolated dam is disposed below the first dam and the second dam.

5. The display device of claim 1 , further comprising:

a thin film transistor disposed in the display area;

a display element electrically connected to the thin film transistor;

an encapsulation layer sealing the display element; and

an inorganic protection layer disposed between the isolated dam and the encapsulation layer.

6. The display device of claim 5 , wherein the encapsulation layer comprises:

a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer consecutively stacked,

wherein the first inorganic encapsulation layer directly contacts the inorganic protection layer at a position at which the first inorganic encapsulation layer overlaps the isolated dam.

7. The display device of claim 5 , wherein the display area further comprises:

a data line that provides data signals to the thin film transistor, wherein the inorganic protection layer covers the data line.

8. The display device of claim 5 , further comprising:

a planarization insulating layer disposed between the thin film transistor and the display element; and

a first dam separate from the planarization insulating layer and surrounding the display area,

wherein the inorganic protection layer covers the first connection unit and the second connection unit between the planarization insulating layer and the first dam.

9. The display device of claim 8 ,

wherein the encapsulation layer comprises a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer consecutively stacked,

wherein the first inorganic encapsulation layer and the second inorganic encapsulation layer contact each other outside the organic encapsulation layer, and the first inorganic encapsulation layer and the second inorganic encapsulation layer extend outside of the first dam.

10. The display device of claim 8 , wherein the inorganic protection layer covers the isolated dam in an area exposed between the first connection unit and the second connection unit.

11. The display device of claim 1 , further comprising:

a thin film transistor disposed in the display area;

a display element electrically connected to the thin film transistor;

a planarization insulating layer disposed between the thin film transistor and the display element;

a first dam disposed in the peripheral area; and

a second dam disposed in the peripheral area, wherein the first dam and the second dam are separate from the planarization insulating layer,

wherein the isolated dam is disposed between the display area and the second dam.

12. The display device of claim 1 , further comprising:

a thin film transistor in the display area, and a display element electrically in contact with the thin film transistor, wherein

the display element further comprises a pixel electrode, an opposite electrode located to face the pixel electrode, and an intermediate layer located between the pixel electrode and the opposite electrode, the intermediate layer including an emission layer, and

the emission layer includes a quantum dot material.

13. The display device of claim 12 , wherein

the quantum dot material comprises a core and a shell covering the core, and the core includes a material selected from among Group II-VI compounds, Group III-V compounds, Group IV-VI compounds, Group IV elements, Group IV compounds, and combinations thereof.

14. The display device of claim 1 , wherein the isolated dam is disposed only between the display area and the pad area.

15. A display device, comprising:

a substrate comprising a display area, a peripheral area disposed at a periphery of the display area, and a pad area disposed in the peripheral area;

a first voltage line disposed in the peripheral area between a first side of the display area and the pad area;

a second voltage line disposed at other sides of the display area; and

an isolated dam disposed between the display area and the pad area,

wherein the first voltage line comprises a first main voltage line and a first connection unit, wherein the first connection unit protrudes from the first main voltage line and extends toward the pad area,

wherein the second voltage line comprises a second main voltage line and a second connection unit, wherein the second connection unit protrudes from the second main voltage line and extends toward the pad area,

wherein the isolated dam extends substantially parallel to the first main voltage line, and

wherein the isolated dam is disposed between the first connection unit and the second connection unit, a first end of the isolated dam overlaps the first connection unit, and a second end of the isolated dam that opposes the first end overlaps the second connection unit,

wherein the substrate further comprises a bending area disposed between the display area and the pad area,

wherein an inorganic insulating layer stacked on the substrate comprises a groove formed at a position corresponding to the bending area, and an organic material layer is disposed in the groove,

wherein the isolated dam comprises a same material as the organic material layer.

16. A display device, comprising:

a substrate comprising a display area, a peripheral area disposed at a periphery of the display area, and a pad area disposed in the peripheral area;

a first voltage line disposed in the peripheral area between a first side of the display area and the pad area;

a second voltage line disposed at other sides of the display area; and

an isolated dam disposed between the display area and the pad area,

wherein the first voltage line comprises a first main voltage line and a first connection unit, wherein the first connection unit protrudes from the first main voltage line and extends toward the pad area,

wherein the second voltage line comprises a second main voltage line and a second connection unit, wherein the second connection unit protrudes from the second main voltage line and extends toward the pad area,

wherein the isolated dam extends substantially parallel to the first main voltage line, and

wherein the isolated dam is disposed between the first connection unit and the second connection unit, a first end of the isolated dam overlaps the first connection unit, and a second end of the isolated dam that opposes the first end overlaps the second connection unit,

wherein the first end of the isolated dam overlaps the first connection unit in a cross-sectional view, and the second end of the isolated dam opposes the first end in the cross-sectional view and overlaps the second connection unit in the cross-sectional view.