Display device

1. A display device comprising:

a display panel including a light emitting element configured to generate light; and

an input detection layer disposed on the display panel and including:

a plurality of sensing electrodes disposed on the display panel and arranged in one direction; and

a plurality of trace lines electrically connected to the plurality of sensing electrodes, respectively,

wherein at least one of the trace lines comprises:

a single layer part including one conductive layer; and

a multilayer part including at least two conductive layers disposed on different layers,

wherein the input detection layer further comprises a pad part including a plurality of input pads respectively connected to one ends of the trace lines, and

wherein a length ratio of the single layer part to the total length of each trace line is determined differently depending on a distance between the pad part and a corresponding sensing electrode.

2. The display device of claim 1 , wherein:

a length of an i th trace line among the trace lines and a length of a j th trace line among the trace lines are different from each other;

each of the i th trace line and the j th trace line comprises the single layer part and the multilayer part; and

a length ratio of the single layer part and the multilayer part of the i th trace line is different from a length ratio of the single layer part and the multilayer part of the j th trace line.

3. The display device of claim 2 , wherein:

a total length of the j th trace line is greater than a total length of the i th trace line; and

a length ratio of the single layer part to the total length of the i th trace line is greater than a length ratio of the single layer part to the total length of the j th trace line.

4. The display device of claim 1 , wherein:

the trace lines are grouped into a plurality of groups;

each of trace lines of a first group among the groups comprises the single layer part and the multilayer part; and

a length of the single layer part of each of the trace lines of the first group is the same.

5. The display device of claim 4 , wherein:

the trace lines of the first group include a j th trace line and an i th trace line; and

a width of the single layer part of the j th trace line is different from a width of the single layer part of the i th trace line.

6. The display device of claim 5 , wherein:

a length of the j th trace line is greater than a length of the i th trace line; and

the width of the single layer part of the i th trace line is less than the width of the single layer part of the j th trace line.

7. The display device of claim 4 , wherein at least one of the trace lines of the first group further comprises a compensation part.

8. The display device of claim 7 , wherein:

the trace lines of the first group include a j th trace line and an i th trace line each comprising the compensation part;

a length of the j th trace line is greater than a length of the i th trace line; and

a length of the compensation part of the i th trace line is greater than a length of the compensation part of the j th trace line.

9. The display device of claim 1 , wherein

the length ratio of the single layer part to the total length of each trace line decreases as a distance between the pad part and the corresponding sensing electrode increases.

10. The display device of claim 1 , wherein the input detection layer further comprises:

a first insulating layer; and

a second insulating layer disposed on the first insulating layer.

11. The display device of claim 10 , wherein:

the multilayer part comprises a first wiring layer disposed on the second insulating layer and a second wiring layer disposed on the first insulating layer;

the single layer part comprises one of the first and second wiring layers.

12. The display device of claim 11 , wherein the multilayer part comprises a contact portion where the first wiring layer and the second wiring layer are connected.

13. The display device of claim 11 , wherein:

each of the sensing electrodes is disposed on the second insulating layer;

the single layer part comprises the first wiring layer; and

the first wiring layer is integrally formed with the sensing electrodes.

14. The display device of claim 1 , wherein:

the display panel further comprises an encapsulation layer covering the light emitting element; and

the input detection layer is disposed directly on the encapsulation layer.

15. The display device of claim 14 , wherein:

the encapsulation layer comprises:

a first inorganic layer;

an organic layer disposed on the first inorganic layer; and

a second inorganic layer disposed on the organic layer and contacting the first inorganic layer to seal the organic layer; and

one ends of the trace lines extends along the second inorganic layer and is disposed outside the organic layer.

16. The display device of claim 15 , wherein:

the input detection layer further comprises a first insulating layer disposed on the second inorganic layer, and a second insulating layer disposed on the first insulating layer;

the multilayer part comprises a first wiring layer disposed on the second insulating layer and a second wiring layer disposed on the first insulating layer; and

the single layer part comprises one of the first and second wiring layers.

17. The display device of claim 14 , wherein:

the display panel comprises an active area to display an image and a peripheral area disposed outside the active area;

the sensing electrodes are disposed in the active area; and

the trace lines are disposed in the peripheral area.

18. A display device comprising:

a display panel including a light emitting element configured to generate light; and

an input detection layer disposed on the display panel, and including:

a plurality of first sensing electrodes disposed on the display panel, extending in a first direction, and arranged in a second direction intersecting the first direction;

a plurality of second sensing electrodes disposed on the display panel, extending in the second direction, and arranged in the first direction;

a plurality of first trace lines electrically connected to the first sensing electrodes, respectively; and

a plurality of second trace lines electrically connected to the second sensing electrodes, respectively,

wherein at least one of the first and second trace lines comprises:

a single layer part including one wiring layer; and

a multilayer part including at least two wiring layers disposed on different layers,

wherein a length of an i th trace line among the first and second trace lines and a length of a j th trace line among the first and second trace lines are different from each other,

wherein each of the i th trace line and the j th trace line comprises the single layer part and the multilayer part, and

a length ratio of the single layer part and the multilayer part in the i th trace line is different from a length ratio of the single layer part and the multilayer part in the j th trace line.

19. The display device of claim 18 , wherein:

a total length of the j th trace line is greater than a total length of the i th trace line; and

a length ratio of the single layer part to the total length of the i th trace line is greater than a length ratio of the single layer part to the total length of the j th trace line.

20. The display device of claim 18 , wherein:

the display panel further comprises an encapsulation layer covering the light emitting element; and

the input detection layer comprises a first insulating layer directly disposed on the encapsulation layer and a second insulating layer disposed on the first insulating layer.

21. The display device of claim 20 , wherein:

the multilayer part comprises a first wiring layer disposed on the first insulating layer and a second wiring layer disposed on the second insulating layer; and

the single layer part comprises one of the first and second wiring layers.