Touch panel

Patent metadata

Field	Value
Publication number	US-9772727-B2
Application number	US-201414539120-A
Country	US
Kind code	B2
Filing date	Nov 12, 2014
Priority date	Nov 13, 2013
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A touch panel includes a cover substrate having an active area and an unactive area. A printing layer is provided on the unactive area while forming a step difference from the cover substrate. An insulating layer is provided on the printing layer, and the insulating layer has average surface roughness in a range of 0.2 μm to 0.4 μm.

First claim

What is claimed is:

1. A touch panel comprising:
a cover substrate having an active area and an unactive area;
a printing layer on the unactive area;
an insulating layer on a top surface of the active area and an interior lateral surface of the printing layer that faces the active area;
a sensing electrode on the active area;
a wire electrode over the unactive area; and
a conductive layer extending between the sensing electrode and the wire electrode,
wherein at least a portion of the conducting layer is formed directly on the insulating layer,
wherein the wire electrode is formed directly on at least one of the insulating layer or the conductive layer, and
wherein the insulation layer is positioned between the printing layer and the wire electrode and the conductive layer such that the wire electrode and the conductive layer do not contact the top surface or the interior lateral surface of the printing layer.

2. The touch panel of claim 1 , wherein the printing layer comprises first and second printing layers having widths different from each other.

3. The touch panel of claim 1 , wherein the printing layer comprises:
a first printing layer provided on the cover substrate to form a first step difference part together with the cover substrate; and
a second printing layer provided on the first printing layer to form a second step difference part together with the first printing layer.

4. The touch panel of claim 3 , wherein the insulating layer extends from a lateral side of the first printing layer to a top surface of the second printing layer.

5. The touch panel of claim 4 , wherein the insulating layer directly contacts the lateral side and a top surface of the first printing layer, and a lateral side and the top surface of the second printing layer.

6. The touch panel of claim 4 , wherein the sensing electrode comprises:
first and second sensing electrodes provided on a same surface of the cover substrate, and
wherein the touch panel further comprises:
an insulating material on the first and second sensing electrodes; and
a bridge electrode connected with two second sensing electrodes on the active area.

7. The touch panel of claim 6 , wherein the insulating layer comprises a material identical to the insulating material.

8. The touch panel of claim 6 ,
wherein the conductive layer comprises a material identical to a material constituting at least one of the first sensing electrode, the second sensing electrode, or the bridge electrode.

9. The touch panel of claim 8 , wherein the conductive layer is formed integrally with the first and second sensing electrodes.

10. The touch panel of claim 3 , wherein the insulating layer extends along a lateral side and a top surface of the first printing layer and a lateral side and a top surface of the second printing layer from the active area of the cover substrate spaced apart from a boundary surface between the unactive area and the active area of the cover substrate by a distance of 50 μm.

11. The touch panel of claim 4 , further comprising:
a bridge electrode; and
an insulating material on the bridge electrode,
wherein the sensing electrode includes:
a first sensing electrode on the insulating material; and
second sensing electrodes connected by the bridge electrode.

12. The touch panel of claim 11 , wherein the insulating layer comprises a material identical to the insulating material.

13. The touch panel of claim 11 ,
wherein the conductive layer comprises a material identical to a material constituting at least one of the first sensing electrode, the second sensing electrode, or the bridge electrode.

14. The touch panel of claim 13 , wherein the conductive layer is formed integrally with the first and second sensing electrodes.

15. The touch panel of claim 11 , wherein the first and second sensing electrodes are provided on a same surface of the cover substrate.

16. The touch panel of claim 1 , wherein the insulating layer has a thickness in a range of 2 μm to 3 μm.

17. The touch panel of claim 1 , wherein the sensing electrode comprises first and second sensing electrodes provided on a same surface of the cover substrate;
wherein the touch panel further comprises a substrate on the cover substrate,
wherein the first sensing electrode is disposed on the cover substrate, and
wherein the second sensing electrode is disposed on the substrate.

18. A touch device having a touch panel of claim 1 and further having a display panel on the touch panel.

Assignees

• Lg Innotek Co Ltd

Inventors

• Kim Byeong Seob

Classifications

• G06F2203/04111

  Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/03547 Primary

  Touch pads, in which fingers can move on a surface · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title