Capacitive touch panel and fabricating method thereof

• US 8,947,366 B2
• Filed: 01/13/2009
• Issued: 02/03/2015
• Est. Priority Date: 06/23/2008
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Chien, Yu-Feng, Yang, Tun-Chun, Lee, Seok-Lyul, Huang, Wei-Ming
• Primary Examiner(s): Tryder, Gregory J
• Application Number:
  US12/352,613
• Publication Number:
  US 20090315859A1
• Time in Patent Office: 2,212 Days
• Field of Search: 345173-178, 178/18.01, 178/18.06
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: Y10T 29/49124 On flat or curved insulated base, e.g., printed circuit, etc.

Abstract

A capacitive touch panel including a substrate, a plurality of first touch pads, a plurality of first dummy pads, an insulator layer, a plurality of second touch pads, and a plurality of second dummy pads is provided. The first touch pads arranged along a first direction are electrically connected. Each first touch pad has at least a first opening. The insulator layer covers the first touch pads and the first dummy pads insulated therefrom. The second touch pads arranged along a second direction are electrically connected and each second touch pad has at least a second opening. The size of the second opening is substantially larger than that of each first dummy pad. The second dummy pads insulated from the second touch pads are disposed on the insulator layer above the first opening, wherein the size of the first opening is substantially larger than that of each second dummy pad.

Claims

1. A capacitive touch panel, comprising:

a substrate;

a plurality of first touch pads disposed on the substrate, the first touch pads being arranged along a first direction and electrically connected with one another, and each first touch pad having at least a first opening, wherein the first opening is disposed in the first touch pads;

a plurality of first dummy pads disposed on the substrate and insulated from the first touch pads;

an insulator layer disposed on the substrate to cover the first touch pads and the first dummy pads;

a plurality of second touch pads disposed on the insulator layer, the second touch pads being arranged along a second direction and electrically connected with one another, each second touch pad having at least a second opening arranged above the first dummy pads, and the size of the second opening being substantially larger than that of each first dummy pad, wherein the second opening is disposed in the second touch pads; and

a plurality of second dummy pads disposed on the insulator layer and insulated from the second touch pads, wherein the second dummy pads are arranged above the first opening, and the size of the first opening is substantially larger than that of each second dummy pad, and the first touch pads, the first dummy pads, the second touch pads, and the second dummy pads are disposed in a manner of not overlapping with one another, wherein each of the second dummy pads is located in the center of the corresponding first opening of the first touch pads, and each of the first dummy pads is located in the center of the corresponding second opening of the second touch pads.

2. The capacitive touch panel of claim 1, wherein a center of the first opening is respectively substantial aligned with a center of one of the second dummy pads.

3. The capacitive touch panel of claim 1, wherein a center of the second opening is respectively substantial aligned with a center of one of the first dummy pads.

4. The capacitive touch panel of claim 1, wherein each first dummy pad and each second dummy pad are electrically floating.

5. The capacitive touch panel of claim 1, wherein the first direction substantially interlaces the second direction.

6. The capacitive touch panel of claim 1, further comprising:

a plurality of first connection lines disposed on the substrate and connected between the first touch pads; and

a plurality of second connection lines disposed on the insulator layer and connected between the second touch pads, wherein each first connection line respectively interlaces one of the second connection lines, and each first connection line is insulated from each second connection line.

7. The capacitive touch panel of claim 1, further comprising:

a plurality of third dummy pads disposed on the substrate and distributed between the first touch pads and the first dummy pads, and each third dummy pad, the first touch pads, and each first dummy pad are insulated; and

a plurality of fourth dummy pads disposed on the insulator layer and distributed between the second touch pads and the second dummy pads, and each fourth dummy pad, the second touch pads, and each second dummy pad are insulated.

8. The capacitive touch panel of claim 1, further comprising a passivation layer disposed on the insulator layer to cover the second touch pads and the second dummy pads.

9. A display panel, comprising the capacitive touch panel of claim 1.

10. An electro-optical apparatus, comprising the display panel of claim 9.

11. A method for fabricating a capacitive touch panel, comprising:

forming a plurality of first touch pads and a plurality of first dummy pads on a substrate, the first touch pads being arranged along a first direction and electrically connected with one another, each first touch pad having at least a first opening, and the first dummy pads being insulated from the first touch pads, wherein the first opening is disposed in the first touch pads;

forming an insulator layer on the substrate to cover the first touch pads and the first dummy pads;

forming a plurality of second touch pads and a plurality of second dummy pads on the Insulator layer, the second touch pads being arranged along a second direction and electrically connected with one another, each second touch pad having at least a second opening arranged above the first dummy pads, the second dummy pads being insulated from the second touch pads, and the second dummy pads being arranged above the first opening, wherein the size of the second opening is substantially larger than that of each first dummy pad, and the size of the first opening is substantially larger than that of each second dummy pad, and the first touch pads, the first dummy pads, the second touch pads, and the second dummy pads are disposed in a manner of not overlapping with one another, and wherein the second opening is disposed in the second touch pads, wherein each of the second dummy pads is located in the center of the corresponding first opening of the first touch pads, and each of the first dummy pads is located in the center of the corresponding second opening of the second touch pads.

12. The method for fabricating a capacitive touch panel of claim 11, further comprising:

forming a plurality of first connection lines disposed on the substrate and connected between the first touch pads; and

forming a plurality of second connection lines disposed on the insulator layer and connected between the second touch pads, wherein each first connection line respectively interlaces one of the second connection lines, and each first connection line being insulated from each second connection line.

13. The method for fabricating a capacitive touch panel of claim 11, further comprising:

forming a plurality of third dummy pads disposed on the substrate and distributed between the first touch pads and the first dummy pads, and each third dummy pad, the first touch pads, and each first dummy pad being insulated; and

forming a plurality of fourth dummy pads disposed on the insulator layer and distributed between the second touch pads and the second dummy pads, and each fourth dummy pad, the second touch pads, and each second dummy pad being insulated.

14. The method for fabricating a capacitive touch panel of claim 11, further comprising forming a passivation layer on the insulator layer to cover the second touch pads and the second dummy pads.

15. A method for fabricating a display panel, comprising the method for fabricating a capacitive touch panel of claim 11.

16. A method of fabricating an electro-optical apparatus, comprising the fabricating method of claim 15.

17. A capacitive touch panel, comprising:

a substrate;

a plurality of first touch pads disposed on the substrate, the first touch pads being arranged along a first direction and electrically connected with one another, and each first touch pad having at least a first opening, wherein the first opening is disposed in the first touch pads;

a plurality of first dummy pads disposed on the substrate and insulated from the first touch pads;

an insulator layer disposed on the substrate to cover the first touch pads and the first dummy pads;

a plurality of second touch pads disposed on the insulator layer, the second touch pads being arranged along a second direction and electrically connected with one another, each second touch pad having at least a second opening arranged above the first dummy pads, and the size of the second opening being substantially larger than that of each first dummy pad, and the second opening of each second touch pad overlapping the first dummy pad, wherein the second opening is disposed in the second touch pads; and

a plurality of second dummy pads disposed on the insulator layer and insulated from the second touch pads, wherein the second dummy pads are arranged above the first opening, and the size of the first opening is substantially larger than that of each second dummy pad, and the first opening of each first touch pad overlaps the second dummy pad, wherein each of the second dummy pads is located in the center of the corresponding first opening of the first touch pads, and each of the first dummy pads is located in the center of the corresponding second opening of the second touch pads.