# US 11,029,793 B2 · Touch detecting device and touch-detection capable display device

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- Number: US 11,029,793 B2
- Document ID: US11029793B2
- Status: Granted
- Kind: B2
- Application number: 15/862,098
- Filed: 2018-01-04
- Published: 2018-07-12
- Granted: 2021-06-08
- Earliest claimed: 2018-01-04
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Koji Ishizaki; Hayato Kurasawa
- Web page: https://patentgrep.com/patent/US11029793B2

## CPC

- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- G02F 1/133528: {Polarisers}
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/04184: {Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally}
- G06F 3/0443: {using a single layer of sensing electrodes}
- G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer}
- G06F 3/047: using sets of wires, e.g. crossed wires
- G02F 1/13338: {Input devices, e.g. touch panels}
- G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
- G06F 2203/04107: Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
- 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)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## 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.

## Claims

### Claim 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 plurality of conductive layers including
a first conductive layer that overlaps the metal wires and that is in direct contact with the metal wires, the first conductive layer having a first sheet resistance, and
a second conductive layer provided above the metal wires, the second conductive layer having a second sheet resistance;
a protective layer;
a polarizing plate; and
an insulating layer,
wherein
(a) the first conductive layer having the first sheet resistance that is less than a sheet resistance of the polarizing plate and that is no less than the second sheet resistance, (b) the metal wires having a third sheet resistance that is less than each of the first sheet resistance and the second sheet resistance, (c) the protective layer, (d) the insulating layer, (e) the second conductive layer having the second sheet resistance that is less than the sheet resistance of the polarizing plate and that is no more than the first sheet resistance, the second conductive layer being in direct contact with the polarizing plate, and (f) the polarizing plate, are sequentially stacked in this order on the substrate in a vertical direction perpendicular to the substrate,
allowing static electricity applied to the polarizing plate to flow to the second conductive layer that is in direct contact with the polarizing plate, and
allowing static electricity applied to the metal wires to flow to the first conductive layer that is in direct contact with the metal wires.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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,
the first conductive layer is seamlessly provided and overlaps the sensor section and the dummy section, and
(a) the first conductive layer having the first sheet resistance no less than the second sheet resistance and being in direct contact with both the sensor section and the dummy section, (b) the metal wires having a third sheet resistance that is less than each of the first sheet resistance and the second sheet resistance, and (c) the second conductive layer having the second sheet resistance no more than the first sheet resistance, are sequentially stacked in this order on the substrate in a vertical direction perpendicular to the substrate.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 6)

The touch detecting device according to claim 6, 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.

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 1)

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.

### Claim 10 (depends on 9)

The touch-detection capable display device according to claim 9, 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.

### Claim 11 (depends on 9)

The touch-detection capable display device according to claim 9, 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.

### Claim 12 (depends on 1)

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,
the first conductive layer is seamlessly provided and overlaps the sensor section and the dummy section, and
(a) the first conductive layer having the first sheet resistance that is less than a sheet resistance of the polarizing plate and that is no less than the second sheet resistance, the first conductive layer being in direct contact with both the sensor section and the dummy section, (b) the metal wires having the third sheet resistance that is less than each of the first sheet resistance and the second sheet resistance, (c) the protective layer, (d) the insulating layer, (e) the second conductive layer having the second sheet resistance that is less than a sheet resistance of the polarizing plate, and that is no more than the first sheet resistance, the second conductive layer being in direct contact with the polarizing plate, and (f) the polarizing plate, are sequentially stacked in this order on the substrate in the vertical direction,
allowing static electricity applied to the polarizing plate to flow to the sensor section and the dummy section through the second conductive layer that is in direct contact with the polarizing plate, and
allowing the static electricity reached to the dummy section to flow through the first conductive layer that is in direct contact with both the sensor section and the dummy section.

### Claim 13

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 plurality of conductive layers including
a first conductive layer that overlaps the metal wires and that is in direct contact with the metal wires, the first conductive layer having a first sheet resistance, and
a second conductive layer provided above the metal wires, the second conductive layer having a second sheet resistance;
a protective layer;
a polarizing plate;
an insulating layer;
a cover substrate; and
a third conductive layer,
wherein
(a) the first conductive layer having the first sheet resistance no less than the second sheet resistance, (b) the metal wires having the third sheet resistance that is less than each of the first sheet resistance and the second sheet resistance, (c) the protective layer, (d) the insulating layer, (e) the second conductive layer having the second sheet resistance that is no ore more than the first sheet resistance, the second conductive layer being in direct contact with the polarizing plate, (f) the polarizing plate, (g) the cover substrate, and (h) the third conductive layer that is a touch surface of the touch detecting device, are sequentially stacked in this order on the substrate in the vertical direction,
allowing static electricity from a finger to flow through the third conductive layer and then return to the finger, and
allowing static electricity reached to the polarizing plate via the cover substrate to reach the second conductive layer through the polarizing plate that is in direct contact with the second conductive layer, then to the metal wires through the second conductive layer.

### Claim 14 (depends on 13)

The touch detecting device according to claim 13, 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,
the first conductive layer is seamlessly provided and overlaps the sensor section and the dummy section, and
(a) the first conductive layer having the first sheet resistance no less than the second sheet resistance, the first conductive layer being in direct contact with both the sensor section and the dummy section, (b) the metal wires having the third sheet resistance that is less than each of the first sheet resistance and the second sheet resistance, (c) the protective layer, (d) the insulating layer, (e) the second conductive layer having the second sheet resistance that is no more than the first sheet resistance, the second conductive layer being in direct contact with the polarizing plate, (f) the polarizing plate, (g) the cover substrate, and (h) the third conductive layer that is a touch surface of the touch detecting device, are sequentially stacked in this order on the substrate in the vertical direction,
allowing static electricity from a finger to flow through the third conductive layer and then return to the finger,
allowing static electricity to reach the polarizing plate that is in direct contact with the second conductive layer via the cover substrate, then to reach the sensor section and the dummy section through the second conductive layer that is in direct contact with and the polarizing plate,
allowing static electricity to flow from the dummy section to the first conductive layer and then to reach the sensor section, and
allowing the static electricity reached to the dummy section to flow to a power supply and an GND.

### Claim 15

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 plurality of conductive layers including
a first conductive layer that overlaps the metal wires and that is in direct contact with the metal wires, the first conductive layer having a first sheet resistance, and
a second conductive layer provided above the metal wires, the second conductive layer having a second sheet resistance;
a protective layer;
a polarizing plate;
an insulating layer; and
a cover substrate,
wherein
(a) the first conductive layer having the first sheet resistance no less than the second sheet resistance, (b) the metal wires having the third sheet resistance that is less than each of the first sheet resistance and the second sheet resistance, (c) the protective layer, (d) the insulating layer, (e) the polarizing plate, (f) the cover substrate, and (g) the second conductive layer that has the second sheet resistance that is no more than the first sheet resistance, the second conductive layer being is a touch surface of the touch detecting device, are sequentially stacked in this order on the substrate in the vertical direction,
allowing static electricity from a finger to flow through the second conductive layer and then return to the finger, and
allowing static electricity applied to a surface of the cover substrate from an outside to be transmitted to the metal wires through the second conductive layer, the cover substrate, the polarizing plate, the insulating layer, and the protective layer.

### Claim 16 (depends on 15)

The touch detecting device according to claim 15, 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,
the first conductive layer is seamlessly provided and overlaps the sensor section and the dummy section, and
(a) the first conductive layer having the first sheet resistance no less than the second sheet resistance, the first conductive layer being in direct contact with both the sensor section and the dummy section, (b) the metal wires having the third sheet resistance that is less than each of the first sheet resistance and the second sheet resistance, (c) the protective layer, (d) the insulating layer, (e) the polarizing plate, (f) the cover substrate, and (g) the second conductive layer that has the second sheet resistance that is no more than the first sheet resistance, the second conductive layer being a touch surface of the touch detecting device, are sequentially stacked in this order on the substrate in the vertical direction,
allowing static electricity from a finger to flow through the second conductive layer and then return to the finger,
allowing static electricity applied to a surface of the cover substrate from an outside to be transmitted to the sensor section and the dummy section through the second conductive layer, the cover substrate, the polarizing plate, the insulating layer, and the protective layer,
allowing static electricity to flow from the dummy section to the first conductive layer and then to reach the sensor section, and
allowing the static electricity reached to the sensor section to flow to a power supply and an GND.