Touch sensor and image display device including the same

1. A touch sensor, comprising:

a base layer;

a first electrode layer disposed on the base layer, the first electrode layer comprising:

a plurality of first sensing electrode rows extending in a first direction parallel to a top surface of the base layer; and

first traces branched from each of the first sensing electrode rows and alternately distributed on both lateral portions of the base layer;

a second electrode layer disposed on the base layer, the second electrode layer disposed at a different layer from that of the first electrode layer,

where in the second electrode layer comprising:

a plurality of second sensing electrode columns extending in a second direction that is parallel to the top surface of the base layer and intersects the first direction;

second traces branching from the second sensing electrode columns; and

an intermediate trace electrically connected to each of the first traces, the intermediate trace comprising a first portion connected to each of the first traces and a second portion bent from the first portion,

wherein a width of the first portion of the intermediate trace is greater than a width of the second portion of the intermediate trace and satisfies Equation 1 below:

0.1 P≤W 1<2 P   [Equation 1]

wherein W1 represents the width of the first portion of the intermediate trace, and P is a pitch of the first sensing electrode rows.

2. The touch sensor of claim 1 , wherein the first traces are alternately connected to one end portions and the other end portions of the first sensing electrode rows.

3. The touch sensor of claim 2 , wherein a width of each of the first traces satisfies Equation 1 below:

0.1 P≤W 1<2 P   [Equation 1]

wherein W1 represents the width of the first trace, and P is a pitch of the first sensing electrode rows.

4. The touch sensor of claim 1 , further comprising an insulating layer formed on the base layer and formed between the first electrode layer and the second electrode layer.

5. The touch sensor of claim 4 , wherein the intermediate trace and the second electrode layer is disposed at the same layer.

6. The touch sensor of claim 5 , further comprising a contact penetrating through the insulating layer to connect the intermediate trace and each of the first traces with each other.

7. The touch sensor of claim 5 , terminal end portions of the intermediate trace and the second traces are assembled together on one end portion of the insulating layer.

8. The touch sensor of claim 7 , further comprising a capping layer formed on the terminal end portions of the intermediate trace and the second traces.

9. The touch sensor of claim 8 , wherein the capping layer includes a transparent conductive oxide.

10. The touch sensor of claim 1 , wherein the first sensing electrode row comprises a plurality of first sensing unit electrodes connected to each other along the first direction; and

the second sensing electrode column comprises a plurality of second sensing unit electrodes connected to each other along the second direction.

11. The touch sensor of claim 10 , wherein a sheet resistance of each of the first sensing unit electrodes and the second sensing unit electrodes is from 0.05 to 10Ω/□.

12. The touch sensor of claim 10 , wherein each of the first sensing unit electrodes and the second sensing unit electrodes has a width of 100 μm or less, and the first sensing unit electrodes and the second sensing unit electrodes are provided as fingerprint sensing electrodes.

13. The touch sensor of claim 1 , wherein the first sensing electrode row comprises a plurality of first sub-electrode lines extending in the first direction and connected in parallel to each other; and

the second sensing electrode column comprises a plurality of second sub-electrode lines extending in the second direction and connected in parallel to each other.

14. The touch sensor of claim 13 , further comprising merging portions connecting the first sub-electrode lines to each other to define the first sensing electrode row, and connecting the second sub-electrode lines to each other to define the second sensing electrode column,

wherein the first traces and the second traces extend from each of the merging portions.

15. A window stack structure, comprising:

a window substrate; and

the touch sensor of claim 1 .

16. An image display device, comprising:

a display panel; and

the touch sensor of claim 1 stacked on the display panel.