Touch sensor and image display device including the same

1. A touch sensor, comprising:

a substrate layer;

sensing electrodes disposed on the substrate layer and spaced apart from each other by separation regions formed between peripheries of the sensing electrodes;

an insulating layer covering the sensing electrodes on the substrate layer;

a bridge electrode electrically connecting neighboring sensing electrodes of the sensing electrodes on the insulating layer; and

floating electrodes distributed around the bridge electrode on the insulating layer, the floating electrodes having a waveform or a spatial frequency the same as that of the bridge electrode,

wherein the sensing electrodes include etched regions therein, and the floating electrodes are disposed at a different level from that of the sensing electrodes to be superimposed over the etched regions in a planar view.

2. The touch sensor of claim 1 , wherein the etched regions have a curved line shape selected from the group consisting of a sine curve, a cosine curve, a conic section, a catenary, a curve of pursuit, a cycloid, a trochoid and a cardioid.

3. The touch sensor of claim 1 , wherein the etched regions have a water wave shape extending between vertices of an imaginary polygon.

4. The touch sensor of claim 3 , wherein the etched regions have a shape in which a water wave corresponding to one period is segmented.

5. The touch sensor of claim 1 , wherein the floating electrodes have the same shape as that of the etched regions.

6. The touch sensor of claim 1 , wherein the sensing electrodes comprise first sensing electrodes forming a sensing electrode row; and second sensing electrodes forming a sensing electrode column; and

the etched regions comprise first etched regions formed in the first sensing electrodes and second etched regions formed in the second sensing electrodes.

7. The touch sensor of claim 6 , wherein the sensing electrode row comprises a connecting portion integrally connecting neighboring second sensing electrodes of the second sensing electrodes; and

the bridge electrode electrically connects neighboring first sensing electrodes of the first sensing electrodes.

8. The touch sensor of claim 7 , wherein the bridge electrode is superimposed over a second etched region formed in the connecting portion of the second etched regions in a planar view.

9. The touch sensor of claim 6 , further comprising separation regions formed between peripheries of the first sensing electrodes and the second sensing electrodes; and

dummy patterns defined by the separation regions.

10. The touch sensor of claim 1 , wherein the sensing electrodes, the bridge electrode and the floating electrodes include a transparent conductive oxide layer.

11. The touch sensor of claim 10 , wherein the sensing electrodes, the bridge electrode and the floating electrodes have a multi-layered structure comprising the transparent conductive oxide layer and a metal layer.

12. A window stack structure, comprising:

a window substrate; and

the touch sensor of claim 1 stacked on the window substrate.

13. An image display device, comprising:

a display panel; and

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