Display device

1 . A display device comprising:

a substrate comprising a display area configured to display an image, and a non-display area located outside of the display area and comprising a bending area and a pad area;

a touch sensor layer disposed on the substrate;

a signal line connected to a pad disposed in the pad area, comprising a metal different from the touch sensor layer, and configured to deliver a display driving-related signal; and

a protective link line having a first end and a second end, where the first end is electrically connected to the signal line outside the bending area, and the second end is electrically connected to the signal line inside the bending area, the protective link line comprising the same metal as the touch sensor layer,

wherein a sensor protective layer of the touch sensor layer extends from the display area to the non-display area and is configured to cover the protective link line, and

wherein the touch sensor layer comprises at least one bridge metal and at least one sensor metal, a sensor interlayer insulating layer disposed between the at least one bridge metal and the at least one sensor metal, and the sensor protective layer disposed on the at least one bridge metal and the at least one sensor metal.

2 . The display device of claim 1 , wherein at least a portion of the protective link line extends in a lengthwise direction of the bending area in the bending area, the lengthwise direction of the bending area corresponding to a row direction in which a plurality of gate lines for carrying gate signals are disposed.

3 . The display device of claim 1 , wherein the non-display area comprises:

a first non-display area located outside of the display area in a first direction;

a second non-display area located outside of the display area in a second direction different from the first direction;

a third non-display area located outside of the display area in a direction opposite to the first direction; and

a fourth non-display area located outside of the display area in a direction opposite to the second direction,

wherein the first non-display area comprises the bending area and the pad area,

wherein the protective link line is disposed in the first non-display area, and

wherein at least a portion of the protective link line extends in the second direction in the bending area.

4 . The display device of claim 3 , wherein the protective link line comprises a first protective link line and a second protective link line,

wherein the signal line comprises a first signal line electrically connected to the first protective link line in the first non-display area, and a second signal line electrically connected to the second protective link line in the first non-display area,

wherein the first protective link line and the first signal line transfer a high level gate voltage as the display driving-related signal, and

wherein the second protective link line and the second signal line transfer a low level gate voltage as the display driving-related signal.

5 . The display device of claim 3 , wherein the protective link line comprises a horizontal sub-link line extending in the second direction in the bending area, and a vertical sub-link line extending from the horizontal sub-link line in the first direction, and

wherein a line width of the protective link line is greater than a line width of the signal line.

6 . The display device of claim 1 , wherein the signal line is electrically connected to the protective link line in a first non-display area,

wherein the pad area comprises a first pad area and a second pad area, and

wherein the signal line comprises:

a first line part electrically connected to the first end and extending to the first pad area;

a second line part electrically connected to the second end and extending outside the bending area; and

a third line part electrically connected in parallel with the protective link line between the first end and the second end.

7 . The display device of claim 6 , wherein at least a portion of the third line part is configured to extend in a first direction in the bending area.

8 . The display device of claim 6 , wherein the third line part is disposed in a metal layer located closer to the substrate than the touch sensor layer.

9 . The display device of claim 6 , further comprising:

at least one transistor on the substrate;

at least one light emitting element on the at least one transistor;

an encapsulation layer on the at least one light emitting element; and

a relay electrode configured to electrically interconnect a source electrode or a drain electrode of the at least one transistor and a pixel electrode of the at least one light emitting element,

wherein the touch sensor layer is disposed on the encapsulation layer, the source electrode or the drain electrode is disposed in a first source-drain metal layer, and the relay electrode is disposed in a second source-drain metal layer, and

wherein the third line part is disposed in the second source-drain metal layer.

10 . The display device of claim 6 , wherein the first line part, the second line part, and the third line part are disposed in a metal layer different from the protective link line, and

wherein at least one of the first line part, the second line part, and the third line part is disposed in a metal layer different from a remaining one or more of the first line part, the second line part and the third line part.

11 . The display device of claim 1 , wherein the signal line is electrically connected to the protective link line in a first non-display area,

wherein the pad area comprises a first pad area and a second pad area,

wherein the signal line comprises a first line part electrically connected to the first end and extending to the first pad area, and a second line part electrically connected to the second end and extending outside the bending area, and

wherein a portion of the protective link line extends from inside the bending area toward outside the bending area along a column direction in which a plurality of data lines for carrying data signals are disposed.

12 . The display device of claim 11 , wherein the first line part and the second line part are disposed outside of the bending area.

13 . The display device of claim 11 , wherein the first line part and the second line part are disposed in a metal layer different from the protective link line.

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

a driving chip connected to a first pad area included in the pad area; and

a printed circuit connected to a second pad area included in the pad area,

wherein the protective link line is located closer to the driving chip among the driving chip and the printed circuit.

15 . The display device of claim 14 , wherein the signal line further comprises a line part extending between two points, which are connected respectively to the first end and the second end of the protective link line.

16 . The display device of claim 1 , further comprising a sensor-related line disposed in the non-display area and overlapping with the protective link line in the bending area,

wherein the sensor-related line comprises a main line part not overlapping with the protective link line, and a jumping line part electrically connected to the main line part and overlapping with the protective link line, and

wherein the main line part is disposed in a same metal layer as the protective link line, and the jumping line part is disposed in a metal layer different from the protective link line.

17 . A display device comprising:

a substrate comprising a display area configured to display an image, and a non-display area located outside of the display area and comprising a bending area and a pad area;

at least one transistor on the substrate;

at least one light emitting element on the at least one transistor;

an encapsulation layer on the at least one light emitting element;

a touch sensor layer on the encapsulation layer;

a signal line connected to a pad disposed in the pad area; and

a protective link line disposed in the non-display area and connected in parallel with the signal line,

wherein the protective link line has a first end and a second end, where the first end is electrically connected to the signal line outside the bending area, and the second end is electrically connected to the signal line inside the bending area,

wherein at least a portion of the protective link line extends in the bending area in a lengthwise direction of the bending area, the lengthwise direction of the bending area corresponding to a row direction in which a plurality of gate lines for carrying gate signals are disposed,

wherein a sensor protective layer of the touch sensor layer extends from the display area to the non-display area and is configured to cover the protective link line, and

wherein the touch sensor layer comprises at least one bridge metal and at least one sensor metal, a sensor interlayer insulating layer disposed between the at least one bridge metal and the at least one sensor metal, and the sensor protective layer disposed on the at least one bridge metal and the at least one sensor metal.

18 . The display device of claim 17 , wherein the protective link line comprises a same metal as the touch sensor layer.

19 . A display device comprising:

a substrate comprising a bending area;

a signal line running through the bending area; and

a protective link line connected in parallel with the signal line,

wherein the protective link line has a first end and a second end, where the first end is electrically connected to the signal line outside the bending area, and the second end is electrically connected to the signal line inside the bending area,

wherein at least a portion of the protective link line extends in a lengthwise direction of the bending area in the bending area, the lengthwise direction of the bending area corresponding to a row direction in which a plurality of gate lines for carrying gate signals are disposed,

wherein a sensor protective layer of a touch sensor layer on the substrate extends from a display area to a non-display area and is configured to cover the protective link line, and

wherein the touch sensor layer comprises at least one bridge metal and at least one sensor metal, a sensor interlayer insulating layer disposed between the at least one bridge metal and the at least one sensor metal, and the sensor protective layer disposed on the at least one bridge metal and the at least one sensor metal.