TOUCH PANEL, MANUFACTURING METHOD THEREOF AND DISPLAY DEVICE USING THE SAME

• US 20130321304A1
• Filed: 05/14/2013
• Published: 12/05/2013
• Est. Priority Date: 05/31/2012
• Status: Abandoned Application

• Current Assignee: InnoLux Corporation
• Original Assignee: InnoLux Corporation
• Inventors: Wang, Chung-Kai
• Application Number:
  US13/893,387
• Publication Number:
  US 20130321304A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: H01H 11/00 Apparatus or processes specially adapted for the manufacture of electric switches processes specially adapted for manufacture of rectilinearly movable switches having a plurality of operating members associated with different sets of contacts, e.g. keyboards, H01H13/88
• CPC Class Codes: H01H 9/12 Means for earthing parts of switch not normally conductively connected to the contacts
• CPC Class Codes: Y10T 29/49105 Switch making

Abstract

A touch panel, a manufacturing method and a display device using the same are provided. The touch panel includes a substrate, a conductive layer, an insulating layer, a shielding layer and a flexible printed circuit board. The conductive layer is disposed on the substrate. The insulating layer is disposed on the conductive layer. The shielding layer is disposed on the insulating layer. The flexible printed circuit board has a ground trace electronically connected to the conductive layer. The shielding layer is electronically connected to the ground trace through at least one conductive through hole.

Claims

1. A touch panel, comprising:

a substrate;

a conductive layer disposed on the substrate;

an insulating layer disposed on the conductive layer;

a shielding layer disposed on the insulating layer; and

a flexible printed circuit board having a ground trace electronically connected to the conductive layer,

wherein the shielding layer is electronically connected to the ground trace through at least one conductive through hole.

2. The touch panel according to claim 1, wherein one end of the flexible printed circuit board having the conductive through hole is disposed on the shielding layer, and the conductive through hole contacts the shielding layer and the ground trace, so that the shielding layer is electronically connected to the ground trace through the conductive through hole.

3. The touch panel according to claim 1, wherein the insulating layer has the conductive through hole contacted the shielding layer and the conductive layer, so that the shielding layer is electronically connected to the ground trace through the conductive through hole and the conductive layer.

4. The touch panel according to claim 1, wherein the substrate has a touch area and a circuit area, the conductive layer has a guard ring disposed in the circuit area, and the ground trace is electronically connected to the guard ring of the conductive layer.

5. The touch panel according to claim 1, wherein the quantity of the at least one conductive through hole is greater than or equal to 2.

6. The touch panel according to claim 1, wherein the diameter of the conductive through hole is between 0.5 to 2 millimeters (mm).

7. A manufacturing method of touch panel, comprising:

providing a substrate;

forming a conductive layer on the substrate;

disposing an insulating layer and a shielding layer on the conductive layer, wherein the shielding layer is disposed on the insulating layer;

connecting a flexible printed circuit board to the conductive layer, wherein the flexible printed circuit board has a ground trace electronically connected to the conductive layer; and

forming at least one conductive through hole, so that the shielding layer is electronically connected to the ground trace of the flexible printed circuit board through the conductive through hole.

8. The manufacturing method of touch panel according to claim 7, wherein in the step of connecting the flexible printed circuit board to the conductive layer, the substrate has a touch area and a circuit area, the conductive layer has a guard ring disposed in the circuit area, and the ground trace is electronically connected to the guard ring of the conductive layer.

9. The manufacturing method of touch panel according to claim 7, wherein in the step of the flexible printed circuit board, one end of the flexible printed circuit board is disposed on the shielding layer;

in the step of forming the conductive through hole, the conductive through hole is formed on the end of the flexible printed circuit board and contacts the shielding layer and the ground trace, so that the shielding layer through the conductive through hole is electronically connected to the ground trace.

10. The manufacturing method of touch panel according to claim 7, wherein in the step of forming the conductive through hole, the conductive through hole is formed in the insulating layer and contacts the shielding layer and the conductive layer, so that the shielding layer is electronically connected to the ground trace through the conductive through hole and the conductive layer.

11. The manufacturing method of touch panel according to claim 7, wherein the step of connecting the flexible printed circuit board comprises:

adhering the flexible printed circuit board on the conductive layer with an anisotropic conductive adhesive or an anisotropic conductive film; and

thermoforming the flexible printed circuit board, so that the anisotropic conductive adhesive or the anisotropic conductive film is electronically connected to the conductive layer and the ground trace.

12. The manufacturing method of touch panel according to claim 7, wherein in the step of forming the conductive through hole, the quantity of the at least one conductive through hole is greater than or equal to 2.

13. The manufacturing method of touch panel according to claim 7, wherein the step of forming the conductive through hole comprises:

infusing a melted conductive plasma to a via hole; and

cooling the conductive plasma.

14. A display device, comprising:

a display panel; and

a touch panel, comprising;

a substrate;

a conductive layer disposed on the substrate;

an insulating layer disposed on the conductive layer;

a shielding layer disposed on the insulating layer; and

a flexible printed circuit board having a ground trace electronically connected to the conductive layer,

wherein the shielding layer is electronically connected to the ground trace through at least one conductive through hole.