Flexible display device including thin film encapsulation patterns

1. A flexible display device comprising:

a substrate which is bendable or rollable based on an axis;

a plurality of display elements on the substrate; and

a plurality of thin-film encapsulation patterns which covers the plurality of display elements, wherein

the plurality of thin-film encapsulation patterns comprise a first thin-film encapsulation pattern and a second thin-film encapsulation pattern, which are apart from each other in a direction crossing the axis, and

each of the first thin-film encapsulation pattern and the second thin-film encapsulation pattern extends in parallel to the axis of the flexible display device,

a groove having an undercut structure defined between the first thin-film encapsulation pattern and the second thin-film encapsulation pattern,

wherein the groove is not defined in the substrate, and

wherein the groove extends in parallel to the axis of the flexible display device.

2. The flexible display device of claim 1 , wherein

each of the first thin-film encapsulation pattern and the second thin-film encapsulation pattern comprises an organic encapsulation layer and an inorganic encapsulation layer.

3. The flexible display device of claim 1 , wherein

each of the first thin-film encapsulation pattern and the second thin-film encapsulation pattern comprises a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer, which are sequentially stacked one on another,

the organic encapsulation layer of the first thin-film encapsulation pattern and the organic encapsulation layer of the second thin-film encapsulation pattern are apart from each other, and

the second inorganic encapsulation layer of the first thin-film encapsulation pattern and the second inorganic encapsulation layer of the second thin-film encapsulation pattern are apart from each other.

4. The flexible display device of claim 3 , wherein

the first inorganic encapsulation layer of the first thin-film encapsulation pattern and the first inorganic encapsulation layer of the second thin-film encapsulation pattern are connected to each other.

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

a first organic insulating layer between the substrate and the plurality of display elements, wherein

an opening is defined through a portion of the first organic insulating layer between the first thin-film encapsulation pattern and the second thin-film encapsulation pattern.

6. The flexible display device of claim 1 , wherein

each of the plurality of display elements comprises a pixel electrode, an emission layer on the pixel electrode, and an opposite electrode on the emission layer, and

opposite electrodes of adjacent display elements are disconnected or separated from each other between the first thin-film encapsulation pattern and the second thin-film encapsulation pattern.

7. The flexible display device of claim 6 , wherein

the opposite electrodes of the adjacent display elements are disconnected or separated from each other by the groove.

8. The flexible display device of claim 7 , wherein

each of the plurality of display elements further comprises a functional layer between the pixel electrode and the opposite electrode, and

the functional layer of each of the plurality of display elements is disconnected or separated from the functional layer of an adjacent display element thereof by the groove.

9. A flexible display device comprising:

a substrate which is bendable or rollable based on an axis;

a plurality of display elements on the substrate;

a plurality of thin-film encapsulation patterns which covers the plurality of display elements; and

a separator having a reversely-tapered inclined surface,

wherein

the plurality of thin-film encapsulation patterns comprise a first thin-film encapsulation pattern and a second thin-film encapsulation pattern, which are apart from each other in a direction crossing the axis,

each of the first thin-film encapsulation pattern and the second thin-film encapsulation pattern extends in parallel to the axis of the flexible display device, and

the separator is disposed between the first thin-film encapsulation pattern and the second thin-film encapsulation pattern, and

wherein the separator extends in parallel to the axis of the flexible display device.

10. The flexible display device of claim 9 , wherein

each of the plurality of display elements further comprises a functional layer between the pixel electrode and the opposite electrode, and

the functional layer of each of the plurality of display elements is disconnected or separated from the functional layer of adjacent display element thereof by the separator.

11. The flexible display device of claim 9 , wherein

the opposite electrodes of the adjacent display elements are disconnected or separated from each other by the separator.

12. A flexible display device comprising:

a substrate which is bendable or rollable based on an axis;

a plurality of display elements on the substrate; and

a plurality of thin-film encapsulation patterns which covers the plurality of display elements and is arranged to be apart from one another in a direction crossing the axis,

wherein a groove having an undercut structure is defined between adjacent thin-film encapsulation patterns of the plurality of thin-film encapsulation patterns,

wherein the groove is not defined in the substrate, and

wherein the groove extends in parallel to the axis of the flexible display device.

13. The flexible display device of claim 12 , wherein

each of the plurality of display elements comprises a pixel electrode, an emission layer on the pixel electrode, and an opposite electrode on the emission layer, and

opposite electrodes of adjacent display elements of the plurality of display elements are disconnected or separated from each other by the groove.

14. The flexible display device of claim 13 , wherein

each of the plurality of display elements further comprises a functional layer between the pixel electrode and the opposite electrode, and

the functional layer of each of the plurality of display elements is integrally formed as a single unitary unit, and is disconnected or separated from the functional layer of an adjacent display element thereof by the groove.

15. The flexible display device of claim 12 , wherein

each of the plurality of thin-film encapsulation patterns comprises a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer, which are sequentially stacked one on another, and

first inorganic encapsulation layers of the adjacent thin-film encapsulation patterns are connected to each other.

16. The flexible display device of claim 15 , wherein

organic encapsulation layers of the adjacent thin-film encapsulation patterns are apart from each other, and

second inorganic encapsulation layers of the adjacent thin-film encapsulation patterns are apart from each other.