Capacitance touch panel

Patent metadata

Field	Value
Publication number	US-9740350-B2
Application number	US-201514851170-A
Country	US
Kind code	B2
Filing date	Sep 11, 2015
Priority date	Mar 13, 2013
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A capacitance touch panel 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. A temperature dependency of relative permittivity in the upper adhesive layer and a temperature dependency of relative permittivity in the lower adhesive layer as determined by a temperature dependency evaluation test are both 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 a temperature dependency of relative permittivity in the upper adhesive layer and a temperature dependency of relative permittivity in the lower adhesive layer as determined by a temperature dependency evaluation test are both 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 display screen of the display has a size in a diagonal direction of 5 inches or more.

3. 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.

4. The capacitance touch panel according to claim 3 , 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.

5. The capacitance touch panel according to claim 3 , wherein the temperature dependency of the relative permittivity in the upper adhesive layer or 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 3 , 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 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.

8. The capacitance touch panel according to claim 7 , 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.

9. The capacitance touch panel according to claim 8 , wherein the temperature dependency of the relative permittivity in the upper adhesive layer or 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 8 , wherein a display screen of the display has a size in a diagonal direction of 5 inches or more.

11. The capacitance touch panel according to claim 7 , wherein the temperature dependency of the relative permittivity in the upper adhesive layer or the temperature dependency of the relative permittivity in the lower adhesive layer as determined by the temperature dependency evaluation test is up to 20%.

12. The capacitance touch panel according to claim 7 , 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 1 , wherein the temperature dependency of the relative permittivity in the upper adhesive layer or the temperature dependency of the relative permittivity in the lower adhesive layer as determined by the temperature dependency evaluation test is up to 20%.

14. The capacitance touch panel according to claim 13 , 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

• B32B2607/00

  Walls, panels · CPC title

• B32B27/00 Primary

  Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• G06F3/041

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

• G06F3/044 Primary

  by capacitive means · CPC title