Touch sensing circuit and method for making the same

Patent metadata

Field	Value
Publication number	US-9454267-B2
Application number	US-201113077974-A
Country	US
Kind code	B2
Filing date	Mar 31, 2011
Priority date	Jun 12, 2010
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

The present invention discloses a touch sensing circuit for capacitive touch panel formed on a substrate comprises a transparent conductive layer having a thickness of 100 Å-500 Å; a conductive layer having a thickness of 1000 Å-5000 Å; and an insulating layer having a thickness of 1 μm-5 μm disposed between the transparent conductive layer and the conductive layer.

First claim

What is claimed is:

1. A touch panel, comprising:
a substrate;
a touch sensing circuit formed on a first surface of the substrate; wherein the touch sensing circuit comprises:
a plurality of first electrode units arranged in a first direction;
a plurality of second electrode units arranged in a second direction;
a plurality of first conductive lines for providing connection between the plurality of first electrode units, wherein a first conductive line of the plurality of first conductive lines is connected between adjacent first electrode units;
a plurality of second conductive lines for providing connection between the plurality of second electrode units without establishing an electrical connection between the plurality of first electrode units and the plurality of second electrode units, wherein a second conductive line of the plurality of the second conductive lines is connected between adjacent second electrode units; and
an insulating layer disposed between the first conductive line and the second conductive line, wherein the insulating layer comprises a plurality of insulators, wherein each of the plurality of insulators is spaced apart from another of the plurality of insulators in a matrix manner so that each of the plurality of insulators is disposed between a corresponding first conductive line and a corresponding second conductive line;

a front side passivation layer formed on the touch sensing circuit, wherein the front side passivation layer has a thickness of 1 μm-5 μm; and
a shield layer formed on a second surface of the substrate, wherein the shield layer has a thickness of about 100 Å-500 Å.

2. The touch panel of claim 1 , wherein:
the first electrode units, the second electrode units and the first conductive line are made of a transparent conductive layer having a thickness of 100 Å-500 Å; and
the second conductive line is made of a metal layer having a thickness of 1000 Å-5000 Å.

3. The touch panel of claim 2 , further comprising a plurality of peripheral signal lines, wherein a material and a thickness of the peripheral signal lines are identical to a material and a thickness of the metal layer.

4. The touch panel of claim 2 , further comprising a plurality of peripheral signal lines, wherein a material and a thickness of the peripheral signal lines are identical to a material and a thickness of the transparent conductive layer.

5. The touch panel of claim 1 , wherein the second conductive line is a continuous conductive line formed on at least two of the second electrode units and extends along the second direction.

6. The touch panel of claim 1 , wherein a first insulator of the plurality of insulators is formed on the first conductive line and wherein the second conductive line is formed on the first insulator, or wherein the first insulator is formed on the second conductive line and the first conductive line is formed on the first insulator.

7. The touch panel of claim 1 , wherein the first electrode units and the second electrode units have a shape of a polygon.

8. The touch panel of claim 1 , further comprising at least one first peripheral signal line formed on a first edge of the substrate and at least one second peripheral signal line formed on a second edge of the substrate.

9. The touch panel of claim 1 , wherein the substrate is made of glass and has a thickness of 0.2 mm-1 mm.

10. The touch panel of claim 1 , further comprising: a back side passivation layer formed on the shield layer, wherein the back side passivation layer has a thickness of about 200 Å-800 Å.

11. The touch panel of claim 1 , wherein the each of the plurality of insulators is made of a transparent insulative material or an opaque insulative material.

12. The touch panel of claim 11 , wherein the transparent insulative material comprises epoxy resin, polyimide, polyvinyl chloride or methyl methacrylate, and the opaque insulative material comprises ink.

13. The touch panel of claim 1 , wherein each of the plurality of insulators has a thickness of 1 um-5 um.

14. The touch panel of claim 1 , wherein each of the plurality of insulators has a thickness of 2 um.

15. The touch panel of claim 1 , further comprising a cover glass attached to the front side passivation layer.

16. A touch panel, comprising:
a substrate;
a touch sensing circuit formed on a first surface of the substrate; wherein the touch sensing circuit comprises:
a plurality of first electrode units arranged in a first direction;
a plurality of second electrode units arranged in a second direction;
a plurality of first conductive lines for providing connection between the plurality of first electrode units, wherein a first conductive line of the plurality of first conductive lines is connected between adjacent first electrode units;
a plurality of second conductive lines for providing connection between the plurality of second electrode units without establishing an electrical connection between the plurality of first electrode units and the plurality of second electrode units, wherein a second conductive line of the plurality of the second conductive lines is connected between adjacent second electrode units; and
an insulating layer disposed between the first conductive line and the second conductive line, wherein the insulating layer comprises a plurality of insulators, wherein each of the plurality of insulators is spaced apart from another of the plurality of insulators in a matrix manner so that each of the plurality of insulators is disposed between a corresponding first conductive line and a corresponding second conductive line;

a front side passivation layer formed on the touch sensing circuit, wherein the front side passivation layer has a thickness of 1 μm-5 μm; and
a cover glass attached to the front side passivation layer, wherein the cover glass has a thickness of about 0.2 mm-1 mm.

17. The touch panel of claim 16 , further comprising an adhesive layer connecting between the front side passivation layer and the cover glass, wherein the adhesive layer has a thickness of about 1 mm-3 mm.

18. The touch panel of claim 16 , wherein:
the first electrode units, the second electrode units and the first conductive line are made of a transparent conductive layer having a thickness of 100 Å-500 Å; and
the second conductive line is made of a metal layer having a thickness of 1000 Å-5000 Å.

19. The touch panel of claim 16 , further comprising at least one first peripheral signal line formed on a first edge of the substrate and at least one second peripheral signal line formed on a second edge of the substrate.

20. The touch panel of claim 16 , further comprising a shield layer formed on a second surface of the substrate and a back side passivation layer formed on the shield layer.

Assignees

• Ho Kwan-Sin
• Huang Pingping
• Yan Jianbin
• Zhang Hao
• Cai Zhixiong
• Xiao Tiefei
• Tpk Touch Solutions Xiamen Inc

Inventors

• Ho Kwan-Sin
• Huang Pingping
• Yan Jianbin
• Zhang Hao
• Cai Zhixiong
• Xiao Tiefei

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

• Y10T29/49155

  Manufacturing circuit on or in base · CPC title

• G06F2203/04107

  Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds · 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