Touch sensor and image display device including the same
A touch sensor includes a base layer, sensing electrodes arranged on the base layer, a bridge electrode and a connecting portion. The sensing electrode layer includes first sensing electrodes arranged along a first direction parallel to a top surface of the base layer, and second sensing electrodes arranged along a second direction parallel to the top surface of the base layer. The bridge electrode is disposed on the sensing electrodes to electrically connect the first sensing electrodes neighboring in the first direction to each other. The bridge electrode includes an extension portion and expanded portions formed both ends of the extension portion. The expanded portion has a width greater than that of the extension portion. The connecting portion electrically connects the second sensing electrodes neighboring in the second direction and includes at least one etched region.
1. A touch sensor, comprising:
a base layer;
sensing electrodes arranged on the base layer, the sensing electrodes comprising:
first sensing electrodes arranged along a first direction parallel to a top surface of the base layer; and
second sensing electrodes arranged along a second direction parallel to the top surface of the base layer, the first direction and the second direction crossing each other;
a bridge electrode disposed on the sensing electrodes to electrically connect the first sensing electrodes neighboring in the first direction, the bridge electrode comprising an extension portion and expanded portions formed both ends of the extension portion, the expanded portions having a width in the second direction greater than that of the extension portion;
a connecting portion electrically connecting the second sensing electrodes neighboring in the second direction, the connecting portion including at least one etched region having a hole shape formed in the connecting portion or a recess shape formed at a lateral portion of the connecting portion; and
an insulation layer covering the connecting portion, wherein the bridge electrode is formed on the insulation layer to overlap the connecting portion.
2. The touch sensor according to claim 1 , wherein the bridge electrode has a dumbbell shape.
3. The touch sensor according to claim 1 , wherein the expanded portions are superimposed over the neighboring first sensing electrode, and at least a portion of the extension portions overlaps the at least one etched region of the connecting portion.
4. The touch sensor according to claim 3 , wherein the at least one etched portion of the connecting portion includes a plurality of the etched regions formed along an extending direction of the extension portion.
5. The touch sensor according to claim 3 , wherein a pair of the first sensing electrodes neighboring in the first direction are connected to each other by a plurality of the bridge electrodes.
6. The touch sensor according to claim 1 , wherein the connecting portion is integrally connected to the second sensing electrodes neighboring each other.
7. The touch sensor according to claim 1 , wherein the insulation layer fills the etched region formed in the connecting portion.
8. The touch sensor according to claim 1 , wherein the bridge electrode includes a contact extending from the expanded portion to be in contact with the first sensing electrode, wherein the contact has a smaller width than that of the expanded portion.
9. The touch sensor according to claim 8 , wherein the contact is formed through the insulation layer.
10. The touch sensor according to claim 1 , wherein the etched region includes a pair of the recesses formed at both lateral portions of the connecting portion.
11. The touch sensor according to claim 1 , wherein the sensing electrodes, the bridge electrode and the connecting portion include a transparent conductive oxide.
12. An image display device, comprising:
a display panel; and
the touch sensor of claim 1 on the display panel.
13. The image display device according to claim 12 , further comprising an adhesive layer combining the display panel and the touch sensor with each other.