Capacitance touch panel with silver-inclusive transparent conductive layer(s) and dielectric layer(s)

Patent metadata

Field	Value
Publication number	US-9904431-B2
Application number	US-201715647541-A
Country	US
Kind code	B2
Filing date	Jul 12, 2017
Priority date	Nov 27, 2012
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

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 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 comprising silicon nitride over the conductive layer comprising silver;
processing circuitry electrically connected to the plurality of electrodes and configured to measure an aspect of 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 the 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 1 , wherein the at least one transparent conductive coating further comprises an overcoat comprising zirconium oxide.

5. 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 that faces the second substrate;
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.

6. The capacitive touch panel of claim 5 , wherein the conductive layer that is different from the at least one transparent conductive coating comprises ITO.

7. The capacitive touch panel of claim 1 , wherein the first and second substrates are glass substrates.

8. 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.

9. The capacitive touch panel of claim 8 , wherein the at least one multi-layer transparent conductive coating, when blanket deposited, has a haze of no more than 0.5%.

10. A capacitive touch panel, comprising:
first and second substrates that are spaced apart from one another;
at least one multi-layer transparent conductive coating patterned into a plurality of electrodes and a plurality of conductive traces 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 comprising tin oxide over the conductive layer comprising silver;
processing circuitry electrically connected to the plurality of electrodes and the plurality of traces, wherein the processing circuitry is configured to measure an aspect of capacitance; and
a laminate material located between the first and second substrates.

11. The capacitive touch panel of claim 10 , 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.

12. The capacitive touch panel of claim 10 , wherein the at least one multi-layer transparent conductive coating, when blanket deposited, has a haze of no more than 0.5%.

13. The capacitive touch panel of claim 10 , wherein the at least one multi-layer transparent conductive coating further comprising a layer comprising Ni and Cr located over and directly contacting the conductive layer comprising silver.

Assignees

• Guardian Glass Llc

Inventors

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

Classifications

• G02F1/13338

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

• G06F2203/04103

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