Flexible display device

1. A flexible display device including a plurality of sub pixels, comprising:

a flexible substrate including a folding area and a non-folding area with a folding axis;

a thin film transistor disposed on the flexible substrate;

an organic light emitting diode disposed on the thin film transistor;

an encapsulation layer disposed on the organic light emitting diode;

a touch sensor layer disposed on the encapsulation layer and including a plurality of touch electrodes;

a protective layer disposed on the touch sensor layer; and

a plurality of shock-proof pattern units disposed on the protective layer,

wherein each of the plurality of touch electrodes includes a plurality of metal lines, and

each of the plurality of shock-proof pattern units is disposed on the protective layer so as to overlap at least a part of the plurality of metal lines.

2. The flexible display device according to claim 1 , wherein the plurality of metal lines includes a first metal line extending in a first direction and a second metal line extending in a second direction different from the first direction, and

each of the plurality of touch electrodes has a mesh pattern structure formed by intersecting at least one first metal line and at least one second metal line.

3. The flexible display device according to claim 2 , wherein each of the plurality of shock-proof pattern units is formed to have a circular shape or a polygonal shape so as to overlap an area in which at least one corresponding first metal line and at least one corresponding second metal line intersect.

4. The flexible display device according to claim 2 , wherein at least one of the first metal line and the second metal line extends at an angle different from the folding axis, and

each of the plurality of shock-proof pattern units is disposed to overlap a metal line extending at an angle different from the folding axis, among the plurality of metal lines.

5. The flexible display device according to claim 4 , wherein at least one of the first metal line and the second metal line extends at an angle of approximately 450 to 900 with respect to the folding axis.

6. The flexible display device according to claim 4 , wherein each of the plurality of shock-proof pattern units is formed to have a bar shape extending along a length direction of at least one corresponding first metal line or at least one corresponding second metal line extending at an angle different from the folding axis.

7. The flexible display device according to claim 4 , wherein each of the first metal line and the second metal line extends at an angle different from the folding axis,

each of the plurality of shock-proof pattern units includes a first block extending along a length direction of at least one corresponding first metal line and a second block extending along a length direction of at least one corresponding second metal line, and

the first block and the second block are connected to each other.

8. The flexible display device according to claim 1 , wherein each of the plurality of touch electrodes includes a plurality of openings enclosed by the plurality of metal lines, and

each of the plurality of sub pixels overlaps one of the plurality of openings.

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

a planarization layer disposed on the thin film transistor;

an anode disposed on the planarization layer;

a bank layer disposed on the planarization layer to expose the anode; and

a spacer disposed on the bank layer.

10. The flexible display device according to claim 9 , wherein the spacer does not overlap with any of the plurality of shock-proof pattern units.

11. The flexible display device according to claim 1 , wherein a density of the plurality of shock-proof pattern units disposed on the protective layer so as to correspond to the folding area is larger than a density of the plurality of shock-proof pattern units disposed on the protective layer so as to correspond to the non-folding area.

12. The flexible display device according to claim 1 , wherein the folding area includes a first folding area and a second folding area having a larger radius of curvature than a radius curvature of the first folding area, and

a density of the plurality of shock-proof pattern units disposed on the protective layer so as to correspond to the first folding area is larger than a density of the plurality of shock-proof pattern units disposed on the protective layer so as to correspond to the second folding area.

13. The flexible display device according to claim 1 , wherein the flexible substrate includes a display area in which the plurality of sub pixels is disposed and a non-display area adjacent to the display area,

the flexible display device further comprising:

a dam disposed on the flexible substrate corresponding to the non-display area; and

an auxiliary spacer disposed on the flexible substrate so as to overlap at least a part of an outer circumference of the dam.

14. The flexible display device according to claim 13 , wherein the auxiliary spacer is formed to have a bar shape so as to extend along a length direction of the dam.

15. The flexible display device according to claim 14 , wherein the auxiliary spacer is formed of a same material as the plurality of shock-proof pattern units.

16. The flexible display device according to claim 13 , further comprising a plurality of auxiliary spacers,

wherein each of the plurality of auxiliary spacers is disposed with a zigzag pattern to be spaced apart from each other along a length direction of the dam.