# US 10,310,689 B2 · Sensor sheet and sensor panel

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- Number: US 10,310,689 B2
- Document ID: US10310689B2
- Status: Granted
- Kind: B2
- Application number: 15/508,539
- Filed: 2015-08-24
- Published: 2017-09-14
- Granted: 2019-06-04
- Earliest claimed: 2014-09-12
- Assignees: Polymatech Japan Co., Ltd.
- Applicants: Polymatech Japan Co., Ltd.
- Inventors: Yuta Ohsawa
- Web page: https://patentgrep.com/patent/US10310689B2

## CPC

- G06F 3/044: by capacitive means
- G06F 3/03547: {Touch pads, in which fingers can move on a surface}
- H03K 17/9622: {using a plurality of detectors, e.g. keyboard}
- 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
- H03K 2217/96015: Constructional details for touch switches
- H03K 2217/96031: Combination of touch switch and LC display
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)

## Abstract

To provide a sensor panel and a sensor sheet, in which a conductive fine line and a silhouette of the conductive fine line is difficult to be seen through a display portion during illumination and in which the visibility of the display portion during illumination is good. A light diffusion layer is provided on the sensor sheet, the light diffusion layer diffusing a light of an internal light source L and transmitting the light to sensor electrodes.

## Claims

### Claim 1

A sensor panel, comprising:
a panel substrate;
a decorative layer provided on a first surface side of the panel substrate; and
a sensor sheet provided on a second surface side of the panel substrate opposite from the first surface side;
a display portion that is illuminated by an internal light source; and
an input operation performed from a front surface side of the panel substrate,
wherein the sensor sheet has
a sensor electrode layer including a conductive fine line provided on the back surface side of the panel substrate,
a diffusion layer provided between the sensor electrode layer and the internal light source, the diffusion layer diffusing a light of the internal light source and transmitting the light to the sensor electrode layer, and
an interlayer distance T that is a distance in which the decorative layer and the sensor electrode layer of the sensor sheet are set apart, and a line width W of a conductive fine line satisfies
T≥20W.

### Claim 2 (depends on 1)

The sensor panel according to claim 1, wherein the conductive fine line is a conductive coating film having a line width of 5 μm to 300 μm.

### Claim 3 (depends on 1)

The sensor panel according to claim 1, wherein the light diffusion layer is an uneven layer including an uneven surface on an internal light source side.

### Claim 4 (depends on 3)

The sensor panel according to claim 3, wherein the light diffusion layer is a print layer including an uneven surface on the internal light source side formed by a filling material and a coating film.

### Claim 5 (depends on 3)

The sensor panel according to claim 3, wherein the light diffusion layer is a crimped film including an uneven surface formed by a crimped surface on the internal light source side.

### Claim 6 (depends on 1)

The sensor panel according to claim 1, the conductive fine line located in the diffusion layer.

### Claim 7

A sensor panel, comprising:
a panel substrate;
a decorative layer provided on a first surface side of the panel substrate; and
a sensor sheet provided on a second surface side of the panel substrate opposite from the first surface side;
a display portion that is illuminated by an internal light source; and
an input operation performed from a front surface side of the panel substrate,
wherein the sensor sheet has
a sensor electrode layer including a conductive fine line provided on the back surface side of the panel substrate,
a diffusion layer provided between the sensor electrode layer and the internal light source, the diffusion layer diffusing a light of the internal light source and transmitting the light to the sensor electrode layer, and
an interlayer distance T that is a distance in which the decorative layer and the sensor electrode layer of the sensor sheet are set apart, and a line width W of a conductive fine line satisfies
T≥10W.