Touch detecting device and touch-detection capable display device

Patent metadata

Field	Value
Publication number	US-2018196554-A1
Application number	US-201815862098-A
Country	US
Kind code	A1
Filing date	Jan 4, 2018
Priority date	Jan 6, 2017
Publication date	Jul 12, 2018
Grant date	—

Abstract

A touch detecting device and a touch-detection capable display device are provided each including: a substrate; a touch detection electrode provided on a plane parallel to the substrate and including a plurality of metal wires; a first conductive layer overlapping the metal wires in contact therewith and provided between the substrate and each of the metal wires in a direction perpendicular to the substrate; and a second conductive layer provided above the metal wires. At least one of the first conductive layer and the second conductive layer has a higher sheet resistance than the metal wires.

First claim

What is claimed is:

1 . A touch detecting device comprising:
a substrate; a touch detection electrode provided on a plane parallel to the substrate and including a plurality of metal wires; a first conductive layer overlapping the metal wires in contact therewith and provided between the substrate and the metal wires in a direction perpendicular to the substrate; and a second conductive layer provided above the metal wires, wherein at least one of the first conductive layer and the second conductive layer has a higher sheet resistance than the metal wires.

2 . The touch detecting device according to claim 1 , wherein the second conductive layer has a sheet resistance less than or equal to the sheet resistance of the first conductive layer.

3 . The touch detecting device according to claim 1 , wherein each of the first conductive layer and the second conductive layer is a light-transmissive conductive layer.

4 . The touch detecting device according to claim 1 , wherein each of the first conductive layer and the second conductive layer contains tin oxide or indium oxide.

5 . The touch detecting device according to claim 1 , further comprising:
a protective layer provided above the metal wires and the first conductive layer; a polarizing plate provided above the protective layer; and an insulating layer provided between the polarizing plate and the protective layer, wherein the second conductive layer is provided between the insulating layer and the polarizing plate.

6 . The touch detecting device according to claim 5 , further comprising:
a cover substrate provided above the polarizing plate; and a third conductive layer provided above the cover substrate.

7 . The touch detecting device according to claim 1 , further comprising:
a protective layer provided above the metal wires and the first conductive layer; a polarizing plate provided above the protective layer; an insulating layer provided between the polarizing plate and the protective layer; and a cover substrate provided above the polarizing plate, wherein the second conductive layer is provided above the cover substrate.

8 . The touch detecting device according to claim 1 , wherein
the touch detection electrode includes a sensor section and a dummy section, the dummy section being provided in a manner isolated from the sensor section, and the first conductive layer is seamlessly provided and overlaps the sensor section and the dummy section.

9 . The touch detecting device according to claim 1 , wherein the metal wires include at least one first thin wire and at least one second thin wire in a manner coupled with each other, the first thin wire forming a first angle with respect to a first direction, the second thin wire forming a second angle with respect to the first direction.

10 . The touch detecting device according to claim 1 , wherein
the metal wires are obtained by patterning a metal layer, and the first conductive layer and the metal layer are stacked continuously.

11 . The touch detecting device according to claim 10 , wherein
the patterning of the metal layer includes etching, and an etching rate for the first conductive layer is lower than an etching rate for the metal layer.

12 . The touch detecting device according to claim 1 , wherein the first conductive layer is provided on an entire surface of a display region.

13 . A touch-detection capable display device comprising:
a touch detecting device according to claim 1 ; a plurality of pixel electrodes provided on a plane parallel to the substrate and arranged opposing the touch detection electrode and in a matrix; and a display function layer configured to be driven by an image signal.

14 . The touch-detection capable display device according to claim 13 , further comprising:
a drive electrode provided on a plane parallel to the substrate, the drive electrode being configured to generate a capacitance between the drive electrode and the touch detection electrode.

15 . The touch-detection capable display device according to claim 13 , further comprising:
a drive electrode provided on a plane parallel to the substrate, the drive electrode being configured to generate a transverse electric field between the drive electrode and the pixel electrodes, wherein the display function layer is driven by the transverse electric field.

Assignees

• Japan Display Inc

Inventors

• Ishizaki Koji
• Kurasawa Hayato

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

• G02F1/13338

  Input devices, e.g. touch panels · CPC title

• G06F2203/04107

  Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G02F1/133528

  Polarisers · CPC title