Trace structure for the touch panel and electrical testing method

Patent metadata

Field	Value
Publication number	US-9224544-B2
Application number	US-201313928119-A
Country	US
Kind code	B2
Filing date	Jun 26, 2013
Priority date	Jul 13, 2012
Publication date	Dec 29, 2015
Grant date	Dec 29, 2015

Abstract

A trace structure for a touch panel having a transparent substrate with a touch sensing region and a border region surrounding the touch sensing region, the trace structure including: a plurality of traces disposed on the transparent substrate and within the border region; a plurality of bonding pads disposed in the border region of the transparent substrate, wherein each bonding pad has a first side and a second side, and the first side of each bonding pad is connected to a corresponding trace of the plurality of traces; and at least two trace extending portions extended toward an outer edge of the border region from the second side of two of the plurality of bonding pads.

First claim

What is claimed is:

1. A touch panel, comprising:
a trace structure for a touch panel having a transparent substrate with a touch sensing region and a border region surrounding the touch sensing region, the trace structure comprising:
a plurality of traces disposed on the transparent substrate and within the border region;
a plurality of bonding pads disposed in the border region of the transparent substrate, wherein each bonding pad has a first side and a second side, and the first side of each bonding pad is connected to a corresponding trace of the plurality of traces; and
at least two trace extending portions extended toward an outer edge of the border region from the second side of two of the plurality of bonding pads;

a flexible printed circuit (FPC) board having a plurality of output pads and a plurality of input pads corresponding to the plurality of bonding pads, wherein the input pads are bonded to the bonding pads; and
an anisotropic conductive film (ACF) disposed between the trace structure and the FPC board.

2. The touch panel of claim 1 , further comprising a shielding layer disposed within the border region of the transparent substrate.

3. The touch panel of claim 2 , wherein the shielding layer is disposed between the transparent substrate and the plurality of traces.

4. The touch panel of claim 2 , wherein the shielding layer exposes the touch sensing region.

5. An electrical testing method, comprising:
providing the touch panel of claim 1 ; and

measuring a resistance value between each trace extending portion and the corresponding output pad in the FPC board.

6. The electrical testing method of claim 5 , further comprising:
defining a predetermined resistance value; and
comparing the resistance value with the predetermined resistance value.

7. The electrical testing method of claim 6 , wherein the input pads of the FPC board is determined as being electrically disconnected from the bonding pads of the trace structure if the measured resistance value is greater than the predetermined resistance value.

8. The electrical testing method of claim 6 , wherein the anisotropic conductive film (ACF) is determined as malfunctioned if the measured resistance value is greater than the predetermined resistance value.

9. The electrical testing method of claim 6 , wherein the touch panel is determined as a defective product or a reworked product if the measured resistance valued is greater than the predetermined resistance value.

Assignees

• Hannstar Display Corp

Inventors

• Kao Hung-Chen
• Lin Yu-Sheng
• Teng Chia-Feng

Classifications

• G06F2203/04103

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

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• H01H1/06 Primary

  characterised by the shape or structure of the contact-making surface, e.g. grooved · CPC title

• G06F3/04164 Primary

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title