Capacitive touch panel

Patent metadata

Field	Value
Publication number	US-2016259482-A1
Application number	US-201615157071-A
Country	US
Kind code	A1
Filing date	May 17, 2016
Priority date	Nov 20, 2013
Publication date	Sep 8, 2016
Grant date	—

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.

First claim

What is claimed is:

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.

2 . 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.

3 . 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.

4 . 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.

5 . 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.

6 . 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.

7 . 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.

8 . 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.

9 . 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.

10 . 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.

11 . 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.

12 . 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.

Assignees

• Fujifilm Corp

Inventors

• Ogikubo Shinya
• Shibata Michihiro
• Mitamura Yasuhiro

Classifications

• B32B2255/26

  Polymeric coating · CPC title

• G06F3/0418 Primary

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• B32B2457/208

  Touch screens · CPC title

• 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

• G06F2203/04102

  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 · CPC title