Touch sensor and display device including the same

1. A display device comprising:

a first base substrate comprising:

a display region; and

a non-display region at the periphery of the display region;

a thin film transistor on the first base substrate and overlapping the display region;

a light emitting device connected to the thin film transistor;

a power line connected to the thin film transistor and the light emitting device;

an encapsulation layer covering the light emitting device; and

a touch sensor on a surface of the encapsulation layer, the touch sensor being configured to sense a position of a touch interaction,

wherein the touch sensor comprises:

a second base substrate comprising:

a sensing region corresponding to the display region; and

a peripheral region at a periphery of the sensing region;

an insulating layer on the second base substrate such that the second base substrate is disposed between the insulating layer and the encapsulation layer, the insulating layer comprising contact holes;

a sensor on the second base substrate and overlapping the sensing region; and

sensing lines on the second base substrate and overlapping the peripheral region, the sensing lines being connected to the sensor,

wherein, in the non-display region, the insulating layer overlaps the power line in a view normal to the surface,

wherein each of the sensing lines is formed as a multilayer structure, the multilayer structure comprising:

a first electrically conductive layer on the second base substrate; and

a second electrically conductive layer connected to the first electrically conductive layer via a contact hole among the contact holes,

wherein widths of the sensing lines are different from one another,

wherein the light emitting device comprises:

a first electrode connected to the thin film transistor;

an emitting layer on the first electrode, and

a second electrode on the emitting layer; and

wherein, in a direction normal to a surface of the first base substrate, the second electrode fully overlaps the sensing line such that the second electrode prevents voltages applied to the thin film transistor from interfering with the sensing line.

2. The display device of claim 1 , wherein the widths increase with increasing distance from the sensing region.

3. The display device of claim 2 , wherein sizes of the contact holes corresponding to the sensing lines increase with increasing distance from the sensing region.

4. The display device of claim 1 , wherein, in the view normal to the surface, the sensing lines overlap a portion of the second electrode in the peripheral region.

5. The display device of claim 1 , wherein the sensor comprises:

a first sensing structure extending along a first direction of the second base substrate; and

a second sensing structure extending along a second direction of the second base substrate, the second direction intersecting the first direction.

6. The display device of claim 1 , wherein resistance values of the sensing lines are equivalent.

7. The display device of claim 1 , wherein each of the sensing lines comprises a plurality of contact holes among the contact holes, the plurality of contact holes connecting the first electrically conductive layer to the second electrically conductive layer, the plurality of contact holes comprising the contact hole.

8. A display device comprising:

a substrate comprising:

a display region; and

a non-display region at a periphery of the display region;

a thin film transistor on the substrate and overlapping the display region;

a light emitting device connected to the thin film transistor;

an encapsulation layer covering the light emitting device; and

a touch sensor on a surface of the encapsulation layer, the touch sensor being configured to sense a position of a touch interaction,

wherein the touch sensor comprises:

a sensor overlapping the display region; and

sensing lines overlapping the non-display region, the sensing lines being connected to the sensor,

wherein, in a first direction, widths of the sensing lines are different from one another,

wherein the light emitting device comprises:

a first electrode connected to the thin film transistor;

an emitting layer on the first electrode; and

a second electrode on the emitting layer, and

wherein, when viewed in a second direction normal to a surface of the substrate and the first direction, the second electrode fully overlaps and extends beyond opposing edges of at least one of the sensing lines such that the second electrode prevents voltage applied to the thin film transistor from interfering with the at least one sensing line, the opposing edges opposing one another in the first direction.

9. The display device of claim 8 , wherein:

each of the sensing lines is formed as a multilayer structure;

in the second direction normal to the surface, each multilayer structure varies between a first width and a second width different from the first width, each of the first width and the second width extending in the first direction.

10. The display device of claim 9 , wherein the first widths increase with increasing distance from the sensing region.

11. The display device of claim 9 , wherein:

the multilayer structure comprises:

a first electrically conductive layer on the surface of the substrate;

a second electrically conductive layer on the first electrically conductive layer; and

a third electrically conductive layer between the first electrically conductive layer and the second electrically conductive layer;

a width of the third electrically conductive layer forms the second width; and

the second width is smaller than the first width.

12. The display device of claim 11 , wherein:

a width of the first electrically conductive layer forms the first width; and

widths of the first electrically conductive layer and the second electrically conductive layer are equivalent.

13. The display device of claim 9 , wherein the second widths increase with increasing distance from the sensing region.

14. The display device of claim 1 , wherein, in the view normal to the surface, widths of the first electrically conductive layer and the second electrically conductive layer are equivalent.