Projected capacitive touch panel with silver-inclusive transparent conducting layer(s), and/or method of making the same

Patent metadata

Field	Value
Publication number	US-9733779-B2
Application number	US-201615215908-A
Country	US
Kind code	B2
Filing date	Jul 21, 2016
Priority date	Nov 27, 2012
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

Certain example embodiments relate to capacitive touch panels. First and second glass substrates are substantially parallel and spaced apart from one another. At least one multi-layer transparent conductive coating (TCC) is patterned into electrodes and located between the first and second substrates. The TCC(s) include(s) at least one conductive layer including silver, a dielectric layer including zinc oxide under and directly contacting the conductive layer including silver, and a dielectric layer(s) including tin oxide or silicon nitride over the conductive layer including silver. Processing circuitry electrically connects to the electrodes and measures an aspect of the electrodes' capacitance. A laminate material is located between the first and second glass substrates. The TCC(s), when blanket deposited, may have a visible transmission of at least 88%, a sheet resistances of no more than 10 ohms per square, and a haze of no more than 0.5%. Mutual and self-capacitance designs are disclosed.

First claim

What is claimed is:

1. A capacitive touch panel, comprising:
first and second substrates that are substantially parallel and spaced apart from one another;
at least one multi-layer transparent conductive coating patterned into a plurality of electrodes and located between the first and second substrates, the at least one multi-layer transparent conductive coating including at least one conductive layer comprising silver, a dielectric layer comprising zinc oxide under and directly contacting the conductive layer comprising silver, and a dielectric layer(s) comprising tin oxide or silicon nitride over the conductive layer comprising silver;
processing circuitry electrically connected to the plurality of electrodes and configured to measure an aspect of the electrodes' capacitance; and
a laminate material located between the first and second substrates.

2. The capacitive touch panel of claim 1 , wherein the at least one transparent conductive coating comprises:
a first dielectric layer comprising silicon nitride;
the dielectric layer comprising zinc oxide;
the conductive layer comprising silver;
an upper contact layer over and contacting the conductive layer comprising silver; and
a second dielectric layer comprising silicon nitride.

3. The capacitive touch panel of claim 2 , wherein the at least one transparent conductive coating further comprises a dielectric layer comprising titanium oxide located between at least the first dielectric layer comprising silicon nitride and the dielectric layer comprising zinc oxide.

4. The capacitive touch panel of claim 2 , wherein the at least one transparent conductive coating further comprises, between at least the first dielectric layer comprising silicon nitride and the dielectric layer comprising zinc oxide, a layer comprising titanium oxide, another layer comprising zinc oxide, and a layer comprising tin oxide.

5. The capacitive touch panel of claim 2 , wherein the at least one transparent conductive coating further comprises, between at least the first dielectric layer comprising silicon nitride and the dielectric layer comprising zinc oxide, a layer comprising titanium oxide, another dielectric layer comprising zinc oxide, and another layer comprising titanium oxide.

6. The capacitive touch panel of claim 2 , wherein the at least one transparent conductive coating further comprises an overcoat comprising zirconium oxide.

7. The capacitive touch panel of claim 1 , further comprising first and second transparent conductive coatings respectively supported by the first and second substrates on major surfaces of the first and second substrates that face one another, the first and second transparent conductive coatings being patterned into first and second sets of electrodes respectively, and the laminate material laminating the first and second substrates together with the first and second transparent conductive coatings located between the first and second substrates.

8. The capacitive touch panel of claim 7 , configured for use as a self-capacitance touch panel.

9. The capacitive touch panel of claim 7 , configured for use as a mutual capacitance touch panel, wherein the first set of electrodes comprises transmit electrodes and the second set of electrodes comprises receive electrodes.

10. The capacitive touch panel of claim 1 , further comprising first and second transparent conductive coatings respectively supported by opposing major surfaces of the laminate material, the first and second transparent conductive coatings being patterned into first and second sets of electrodes respectively, the capacitive touch panel being configured for use as a self-capacitance touch panel.

11. The capacitive touch panel of claim 10 , further comprising an optically clear adhesive bonding together the first and second substrates with the first and second transparent conductive coatings located between the first and second substrates.

12. The capacitive touch panel of claim 1 , further comprising:
a conductive layer, different from the at least one transparent conductive coating, supported by a major surface of the laminate material;
wherein the at least one transparent conductive coating is supported by a major surface of the first substrate that faces the second substrate, the capacitive touch panel being configured for use as a mutual capacitance touch panel.

13. The capacitive touch panel of claim 12 , wherein the conductive layer that is different from the at least one transparent conductive coating is supported by the major surface of the laminate material that faces the second substrate.

14. The capacitive touch panel of claim 12 , further comprising an optically clear adhesive bonding together the first and second substrates with the laminate material therebetween.

15. The capacitive touch panel of claim 12 , wherein the conductive layer that is different from the at least one transparent conductive coating comprises ITO.

16. The capacitive touch panel of claim 1 , wherein there is one transparent conductive coating, which is supported by the first substrate on a major surface thereof that faces the second substrate, the one transparent conductive coating being patterned into first and second sets of electrodes that are in substantially the same plane, the capacitive touch panel being configured for use as a mutual capacitance touch panel in which the first set of electrodes function as transmit electrodes and the second set of electrodes function as receive electrodes.

17. The capacitive touch panel of claim 1 , wherein there is one transparent conductive coating, which is supported by the laminate material on a major surface thereof, the one transparent conductive coating being patterned into first and second sets of electrodes that are in substantially the same plane, the capacitive touch panel being configured for use as a mutual capacitance touch panel in which the first set of electrodes function as transmit electrodes and the second set of electrodes function as receive electrodes.

18. The capacitive touch panel of claim 17 , further comprising an optically clear adhesive bonding together the first and second substrates with the laminate material therebetween.

19. The capacitive touch panel of claim 1 , wherein the at least one multi-layer transparent conductive coating, when blanket deposited, has a visible transmission of at least 88% and a sheet resistance of no more than 10 ohms per square.

20. The capacitive touch panel of claim 1 , wherein the at least one multi-layer transparent conductive coating, when blanket deposited, has a haze of no more than 0.5%.

21. The capacitive touch panel of claim 1 , wherein the at least one multi-layer transparent conductive coating is room-temperature deposited and is not heat treated.

22. A display assembly, comprising:
a flat panel display device; and
a capacitive touch panel connected to the flat panel display device, the capacitive touch panel comprising:
first and second substrates that are substantially parallel and spaced apart from one another;
at least one multi-layer transparent conductive coating patterned into a plurality of electrodes and located between the first and second substrates, the at least one multi-layer transparent conductive coating including at least one conductive layer comprising silver, a dielectric layer comprising zinc oxide under and directly contacting the conductive layer comprising silver, and a dielectric layer(s) comprising tin oxide or silicon nitride over

Assignees

• Guardian Industries

Inventors

• Veerasamy Vijayen S
• Blush Jason
• Akkashian Eric W
• Den Boer Willem
• Krasnov Alexey

Classifications

• G06F2203/04103

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

• G02F1/13338

  Input devices, e.g. touch panels · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• C03C17/3644

  the metal being silver · CPC title