Capacitance touch panel

Patent metadata

Field	Value
Publication number	US-9645691-B2
Application number	US-201514827475-A
Country	US
Kind code	B2
Filing date	Aug 17, 2015
Priority date	Mar 13, 2013
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A capacitance touch panel of the invention includes a display, a lower adhesive layer, a capacitance touch panel sensor, an upper adhesive layer and a protective substrate, which are formed in this order. Relative permittivity A in the upper adhesive layer and relative permittivity B in the lower adhesive layer satisfy expression (1): [relative permittivity A≧relative permittivity B . . . (1)] at respective temperatures set in increments of 20° C. from −40° C. to 80° C., and a temperature dependency of the relative permittivity B in the lower adhesive layer as determined by a temperature dependency evaluation test is up to 30%.

First claim

What is claimed is:

1. A capacitance touch panel comprising: a display; a lower adhesive layer; a capacitance touch panel sensor; an upper adhesive layer; and a protective substrate, which are formed in this order,
wherein relative permittivity A in the upper adhesive layer and relative permittivity B in the lower adhesive layer satisfy expression (1):
Relative permittivity A≧relative permittivity B  (1)

at respective temperatures set in increments of 20° C. from −40° C. to 80° C., and
wherein a temperature dependency of the relative permittivity B in the lower adhesive layer as determined by a temperature dependency evaluation test is up to 30%, the temperature dependency evaluation test including sandwiching an adhesive layer between aluminum electrodes, increasing a temperature of the adhesive layer in increments of 20° C. from −40° C. to 80° C., calculating relative permittivity of the adhesive layer at respective temperatures by impedance measurement at 1 MHz, selecting a minimum value and a maximum value from the relative permittivity calculated at the respective temperatures and taking a value (%) determined from an expression [{(maximum value−minimum value)/minimum value}×100] as a temperature dependency.

2. The capacitance touch panel according to claim 1 , wherein a minimum value of the relative permittivity A of the upper adhesive layer at respective temperatures set in increments of 20° C. from −40° C. to 80° C. is equal to or larger than a maximum value of the relative permittivity B of the lower adhesive layer at respective temperatures set in increments of 20° C. from −40° C. to 80° C.

3. The capacitance touch panel according to claim 1 , wherein the capacitance touch panel sensor is a laminate having detection electrodes provided on both surfaces of a substrate or a laminate obtained by bonding together, via an adhesive layer, detection electrode-bearing substrates each having detection electrodes formed on a surface of a substrate.

4. The capacitance touch panel according to claim 3 , wherein each of the detection electrodes comprises a material selected from the group consisting of gold, silver, copper, aluminum, ITO, tin oxide, zinc oxide, cadmium oxide, gallium oxide, titanium oxide, an alloy of silver and palladium, and an alloy of silver, palladium and copper.

5. The capacitance touch panel according to claim 1 , wherein the temperature dependency of the relative permittivity in the lower adhesive layer as determined by the temperature dependency evaluation test is up to 20%.

6. The capacitance touch panel according to claim 1 , wherein a display screen of the display has a size in a diagonal direction of 5 inches or more.

7. The capacitance touch panel according to claim 2 , wherein the capacitance touch panel sensor is a laminate having detection electrodes provided on both surfaces of a substrate or a laminate obtained by bonding together, via an adhesive layer, detection electrode-bearing substrates each having detection electrodes formed on a surface of a substrate.

8. The capacitance touch panel according to claim 2 , wherein the temperature dependency of the relative permittivity in the lower adhesive layer as determined by the temperature dependency evaluation test is up to 20%.

9. The capacitance touch panel according to claim 3 , wherein the temperature dependency of the relative permittivity in the lower adhesive layer as determined by the temperature dependency evaluation test is up to 20%.

10. The capacitance touch panel according to claim 4 , wherein the temperature dependency of the relative permittivity in the lower adhesive layer as determined by the temperature dependency evaluation test is up to 20%.

11. The capacitance touch panel according to claim 2 , wherein a display screen of the display has a size in a diagonal direction of 5 inches or more.

12. The capacitance touch panel according to claim 3 , wherein a display screen of the display has a size in a diagonal direction of 5 inches or more.

13. The capacitance touch panel according to claim 4 , wherein a display screen of the display has a size in a diagonal direction of 5 inches or more.

14. The capacitance touch panel according to claim 5 , wherein a display screen of the display has a size in a diagonal direction of 5 inches or more.

Assignees

• Fujifilm Corp

Inventors

• Ogikubo Shinya
• Shibata Michihiro
• Mitamura Yasuhiro

Classifications

• G06F2203/04112

  Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• 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

• G06F3/0445 Primary

  using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer · CPC title