# US 9,439,302 B2 · Transparent conductive film

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- Number: US 9,439,302 B2
- Document ID: US9439302B2
- Status: Granted
- Kind: B2
- Application number: 13/975,276
- Filed: 2013-08-23
- Published: 2014-12-04
- Granted: 2016-09-06
- Earliest claimed: 2013-05-30
- Assignees: Nanchang O-Film Tech. Co., Ltd.; Suzhou O-Film Tech Co., Ltd.; Shenzhen O-Film Tech Co., Ltd.
- Applicants: Nanchang O-Film Tech Co., Ltd.; Suzhou O-Film Tech Co., Ltd.; Shenzhen O-Film Tech Co., Ltd.
- Inventors: Yunhua Zhao; Yulong Gao; Yunliang Yang; Ying Gu
- Web page: https://patentgrep.com/patent/US9439302B2

## CPC

- G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F 3/04164: {Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads}
- G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer}
- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- H05K 3/361: {Assembling flexible printed circuits with other printed circuits}
- G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
- 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
- H05K 1/0228: {Compensation of cross-talk by a mutually correlated lay-out of printed circuit traces, e.g. for compensation of cross-talk in mounted connectors (balanced signal pairs H05K1/0245)}
- H05K 1/036: {Multilayers with layers of different types}
- H05K 1/0393: {Flexible materials (H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups)}
- H05K 3/107: {by filling grooves in the support with conductive material (H05K3/045, H05K3/101, H05K3/1258 and H05K3/465 take precedence)}
- H05K 3/1258: {by using a substrate provided with a shape pattern, e.g. grooves, banks, resist pattern}
- H05K 2201/0108: Transparent
- H05K 2201/0129: Thermoplastic polymer, e.g. auto-adhesive layer; Shaping of thermoplastic polymer
- H05K 2201/053: Tails
- H05K 2201/09036: Recesses or grooves in insulating substrate
- H05K 2201/09681: Mesh conductors, e.g. as a ground plane
- H05K 2201/09827: Tapered, e.g. tapered hole, via or groove
- H05K 2203/1572: Processing both sides of a PCB by the same process; Providing a similar arrangement of components on both sides; Making interlayer connections from two sides
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A transparent conductive film, includes: a transparent substrate, wherein a transparent substrate includes a body and a flexible board, a width of flexible board is less than that of the body, and the body includes a sensing area and a border area located at an edge of the sensing area; a conduction line, disposed on a transparent flexible substrate; a first conductive layer and a second conductive layer, disposed on two sides of the sensing area opposite to each other; a first electrode trace and a second electrode trace, disposed on the border area, and the first conductive layer and the conduction line are electrically connected through a first electrode trace; the second conductive layer and the conduction line are electrically connected through a second electrode trace. The production efficiency of the above transparent conductive film is improved.

## Claims

### Claim 1

A transparent conductive film, comprising:
a transparent substrate, wherein the transparent substrate comprises a body and a flexible board formed by extending from a side of the body, a width of the flexible board is less than a width of the body, and the body comprises a sensing area and a border area located at an edge of the sensing area;
a conduction line, disposed on the transparent substrate;
a grid-shaped first conductive layer, disposed on a side of the sensing area, wherein the first conductive layer comprises first conductive wires intercrossing each other;
a grid-shaped second conductive layer, disposed on a side of the sensing area opposite to the first conductive layer, wherein the second conductive layer comprises second conductive wires intercrossing each other;
a first electrode trace, disposed on a side of the border area, wherein the first conductive layer and the conduction line are electrically connected via the first electrode trace;
a second electrode trace, disposed on another side of the border area, wherein the second conductive layer and the conduction line are electrically connected via the second electrode trace; and
a first matrix layer, and a first groove is disposed on a surface, which is away from the transparent substrate, of the first matrix layer corresponding to the sensing area, wherein the first conductive layer is accommodated in the first groove.

### Claim 2 (depends on 1)

The transparent conductive film according to claim 1, wherein: on two opposite surfaces of the sensing area, the first groove and a second groove are disposed, respectively, and the first conductive layer is accommodated in the first groove and the second conductive layer is accommodated in the second groove.

### Claim 3 (depends on 2)

The transparent conductive film according to claim 2, wherein, a bottom of the first groove is of a non-planar structure, and a bottom of the second groove is of a non-planar structure.

### Claim 4 (depends on 2)

The transparent conductive film according to claim 2, wherein, a width of the first groove is 0.2 μm˜5 μm, a height of the first groove is 2 μm˜6 μm, and a height to width ratio is greater than 1; a width of the second groove is 0.2 μm˜5 μm, a height of the second groove is 2 μm˜6 μm, and a height to width ratio is greater than 1.

### Claim 5 (depends on 1)

The transparent conductive film according to claim 1, wherein, the first electrode trace and the second electrode trace are embedded in two opposite surfaces of the border area, respectively; or
the first electrode trace or the second electrode trace is directly disposed on two opposite surfaces of the border area.

### Claim 6 (depends on 1)

The transparent conductive film according to claim 1, wherein, the first electrode trace is embedded in a surface, which is away from the transparent substrate, of a first matrix layer corresponding to the border area; or
the first electrode trace is directly disposed on the surface, which is away from the transparent substrate, of the first matrix layer corresponding to the border area.

### Claim 7 (depends on 1)

The transparent conductive film according to claim 1, further comprising a second matrix layer, wherein a second groove is disposed on a surface, which is away from the transparent substrate, of the second matrix layer corresponding to the sensing area, wherein the second conductive layer is accommodated in the second groove.

### Claim 8 (depends on 7)

The transparent conductive film according to claim 7, wherein, the second electrode trace is embedded in a surface, which is away from the transparent substrate, of the second matrix layer corresponding to the border area; or
the second electrode trace is directly disposed on the surface, which is away from the transparent substrate, of the second matrix layer corresponding to the border area.

### Claim 9 (depends on 7)

The transparent conductive film according to claim 7, wherein, a material of the transparent substrate is a thermoplastic material, the thermoplastic material is polycarbonate or polymethylmethacrylate;
a material of the first matrix layer is UV adhesive, embossed plastic or polycarbonate;
a material of the second matrix layer is UV adhesive, embossed plastic or polycarbonate.

### Claim 10 (depends on 1)

The transparent conductive film according to claim 1, wherein, the first electrode trace is grid-shaped or strip-shaped, the grid-shaped first electrode trace comprises the first conductive leads intercrossing each other, the strip-shaped first electrode trace has a minimal width of 10 μm˜200 μm, and a height of 5 μm˜20 μm;
the second electrode trace is grid-shaped or strip-shaped, the grid-shaped second electrode trace comprises the second conductive leads intercrossing each other, the strip-shaped second electrode trace has a minimal width of 10 μm˜200 μm, and a height of 5 μm˜20 μm.

### Claim 11 (depends on 1)

The transparent conductive film according to claim 1, wherein, the conduction line is grid-shaped or strip-shaped, the grid-shaped conduction line is formed by intercrossing conduction wires.

### Claim 12 (depends on 1)

The transparent conductive film according to claim 1, wherein, a material of the first conductive layer is a conductive metal, the conductive metal is silver or copper;
a material of the second conductive layer is a conductive metal, the conductive metal is silver or copper.

### Claim 13 (depends on 1)

The transparent conductive film according to claim 1, further comprising: a transparent protective layer, wherein the transparent protective layer covers at least a part of the transparent substrate, the first conductive layer, the second conductive layer, the first electrode trace, the second electrode trace and the conduction line.

### Claim 14 (depends on 1)

The transparent conductive film according to claim 1, wherein a visible light transmittance of the transparent conductive film is not less than 86%.