TOUCHSCREEN SENSOR

• US 20150022222A1
• Filed: 10/07/2014
• Published: 01/22/2015
• Est. Priority Date: 05/27/2013
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Takao, Hiroyuki, Umemoto, Toru
• Granted Patent: US 9,719,770 B2
• Time in Patent Office: Days
• US Class Current: 324/658
• CPC Class Codes: G01B 2210/58 Wireless transmission of information between a sensor or probe and a control or evaluation unit
• CPC Class Codes: G01B 7/14 for measuring distance or clearance between spaced objects or spaced apertures G01B7/30 takes precedence
• CPC Class Codes: G01R 27/2605 Measuring capacitance capacitive sensors G01D5/24
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A touchscreen sensor includes a transparent base material, a first transparent electrode pattern, a first index-matching layer and a first adhesive layer disposed in this order at one side of the transparent base material, and a second transparent electrode pattern, a second index-matching layer and a second adhesive layer disposed in this order at another side of the transparent base material. The first index-matching layer has a refractive index greater than a refractive index of the first adhesive layer. The second index-matching layer has a refractive index greater than a refractive index of the second adhesive layer. Each of the first index-matching layer and the second index-matching layer has a thickness of 85 nm to 120 nm.

Claims

1. A touchscreen sensor comprising:

a transparent base material;

a first transparent electrode pattern, a first index-matching layer and a first adhesive layer disposed in this order at one side of the transparent base material; and

a second transparent electrode pattern, a second index-matching layer and a second adhesive layer disposed in this order at another side of the transparent base material,

the first index-matching layer having a refractive index greater than a refractive index of the first adhesive layer,

the second index-matching layer having a refractive index greater than a refractive index of the second adhesive layer,

each of the first index-matching layer and the second index-matching layer having a thickness of 85 nm to 120 nm.

2. The touchscreen sensor according to claim 1, wherein a difference between the refractive index of the first index-matching layer and the refractive index of the first adhesive layer is 0.1 to 0.4, and a difference between the refractive index of the second index-matching layer and the refractive index of the second adhesive layer is 0.1 to 0.4.

3. The touchscreen sensor according to claim 1, wherein the refractive index of the first index-matching layer and the refractive index of the second index-matching layer are each 1.5 to 1.8.

4. The touchscreen sensor according to claim 1, wherein the thickness of the first index-matching layer and the thickness of the second index-matching layer are each 90 nm to 110 nm.

5. The touchscreen sensor according to claim 1, wherein the refractive index of the first index-matching layer is greater than the refractive index of the first adhesive layer and smaller than the refractive index of the first transparent electrode pattern, and

the refractive index of the second index-matching layer is greater than the refractive index of the second adhesive layer and smaller than the refractive index of the second transparent electrode pattern.