# US 2016/0259482 A1 · Capacitive touch panel

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- Number: US 2016/0259482 A1
- Document ID: US20160259482A1
- Status: Published application
- Kind: A1
- Application number: 15/157,071
- Filed: 2016-05-17
- Published: 2016-09-08
- Earliest claimed: 2013-11-20
- Assignees: FUJIFILM Corporation
- Applicants: FUJIFILM Corporation
- Inventors: Shinya OGIKUBO; Michihiro SHIBATA; Yasuhiro MITAMURA
- Web page: https://patentgrep.com/patent/US20160259482A1

## CPC

- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- B32B 3/085: {spaced apart pieces on the surface of a layer}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- C09J 201/00: Adhesives based on unspecified macromolecular compounds
- G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/0443: {using a single layer of sensing electrodes}
- B32B 2255/26: Polymeric coating
- B32B 2307/412: Transparent
- B32B 2457/208: Touch screens
- G06F 2203/04102: Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
- G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
- G06F 2203/04112: 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
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)

## Abstract

The invention provides a capacitive touch panel that hardly cause malfunction in a wide range of temperature environment from a low temperature to a high temperature. The capacitive touch panel according to the invention is a capacitive touch panel including a display device, a lower adhesive layer, a capacitive touch panel sensor, an upper adhesive layer, and a protective substrate in this order, in which a maximum value of tan σ of the upper adhesive layer and a maximum value of tan σ of the lower adhesive layer obtained from a temperature dependency evaluation test is 0.08 or less, and tan σ of the lower adhesive layer at each temperature of every 20° C. from −40° C. to 80° C. is equal to or less than tan σ of the upper adhesive layer.

## Claims

### Claim 1

A capacitive touch panel, comprising:
a display device;
a lower adhesive layer;
a capacitive touch panel sensor;
an upper adhesive layer; and
a protective substrate, in this order,
wherein a maximum value of tan σ of the upper adhesive layer and a maximum value of tan σ of the lower adhesive layer, which are obtained from a temperature dependency evaluation test (Test 1) are 0.08 or less, and also tan σ of the lower adhesive layer at respective temperatures of every 20° C. from −40° C. to 80° C. is tan σ or less of the upper adhesive layer, and
wherein a maximum value of tan σ of the upper adhesive layer and a maximum value of tan σ of the lower adhesive layer which are obtained from a temperature dependency evaluation test (Test 2) are 0.08 or less, and also tan σ of the lower adhesive layer at respective temperatures of every 20° C. from −40° C. to 80° C. is equal to or less than tan σ of the upper adhesive layer:
Temperature dependency evaluation test (Test 1): an adhesive layer is sandwiched between aluminum electrodes, the temperature increases by 20° C. from −40° C. to 80° C., and tan σ of the adhesive layer is calculated by the impedance measurement at 100 kHz at each temperature, and
Temperature dependency evaluation test (Test 2): an adhesive layer is sandwiched between aluminum electrodes, the temperature increases by 20° C. from −40° C. to 80° C., and tan σ of the adhesive layer is calculated by the impedance measurement at 1 MHz at each temperature.

### Claim 2 (depends on 1)

The capacitive touch panel according to claim 1,
wherein a maximum value of tan σ of the upper adhesive layer and a maximum value of tan σ of the lower adhesive layer obtained from the temperature dependency evaluation test (Test 1) are 0.06 or less, and
wherein a maximum value of tan σ of the upper adhesive layer and a maximum value of tan σ of the lower adhesive layer obtained from the temperature dependency evaluation test (Test 2) are 0.06 or less.

### Claim 3 (depends on 1)

The capacitive touch panel according to claim 1,
wherein the capacitive touch panel sensor is a laminate comprising detection electrodes on both surfaces of the substrate and a laminate obtained by sticking substrates with detection electrodes comprising detection electrodes on one surface thereof via an adhesive layer.

### Claim 4 (depends on 2)

The capacitive touch panel according to claim 2,
wherein the capacitive touch panel sensor is a laminate comprising detection electrodes on both surfaces of the substrate and a laminate obtained by sticking substrates with detection electrodes comprising detection electrodes on one surface thereof via an adhesive layer.

### Claim 5 (depends on 3)

The capacitive touch panel according to claim 3,
wherein the detection electrode is configured with any one selected from the group consisting of gold, silver, copper, aluminum, ITO, tin oxide, zinc oxide, cadmium oxide, gallium oxide, titanium oxide, a silver palladium alloy, and a silver palladium copper alloy.

### Claim 6 (depends on 4)

The capacitive touch panel according to claim 4,
wherein the detection electrode is configured with any one selected from the group consisting of gold, silver, copper, aluminum, no, tin oxide, zinc oxide, cadmium oxide, gallium oxide, titanium oxide, a silver palladium alloy, and a silver palladium copper alloy.

### Claim 7 (depends on 1)

The capacitive touch panel according to claim 1,
wherein a size of the display surface of the display device in the diagonal direction is 5 inches or greater.

### Claim 8 (depends on 2)

The capacitive touch panel according to claim 2,
wherein a size of the display surface of the display device in the diagonal direction is 5 inches or greater.

### Claim 9 (depends on 3)

The capacitive touch panel according to claim 3,
wherein a size of the display surface of the display device in the diagonal direction is 5 inches or greater.

### Claim 10 (depends on 4)

The capacitive touch panel according to claim 4,
wherein a size of the display surface of the display device in the diagonal direction is 5 inches or greater.

### Claim 11 (depends on 5)

The capacitive touch panel according to claim 5,
wherein a size of the display surface of the display device in the diagonal direction is 5 inches or greater.

### Claim 12 (depends on 6)

The capacitive touch panel according to claim 6,
wherein a size of the display surface of the display device in the diagonal direction is 5 inches or greater.