# US 2008/0185193 A1 · Touch pad structure

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- Number: US 2008/0185193 A1
- Document ID: US20080185193A1
- Status: Published application
- Kind: A1
- Application number: 11/668,783
- Filed: 2007-01-30
- Published: 2008-08-07
- Earliest claimed: 2007-01-30
- Inventors: JAO-CHING LIN
- Web page: https://patentgrep.com/patent/US20080185193A1

## CPC

- 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}
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A touch pad structure includes a first substrate, a joining layer, a guide light layer, a second substrate and an illuminant component. The joining layer is adhered to a side of the first substrate. The guide light layer is disposed next to the joining layer. The second substrate is disposed next to another side of the first substrate and provides electrical circuit and a conductor with sensing loci. The illuminant component is provided beside periphery of the guide light layer to connect with the electrical circuit. The electrical circuit receives change of coupling capacitance at the time of an object touching the touch pad so as to control “On” and “Off” of the illuminant component.

## Claims

### Claim 1

A touch pad structure comprising:
a first substrate with a first side and a second side being opposite to each other;
a joining layer being adhered to the first side;
a guide light layer being disposed next to the joining layer;
a second substrate being disposed next to the second side and providing electrical circuit and a conductor; and
at least an illuminant component being provided beside periphery of the guide light layer to connect with the electrical circuit.

### Claim 2 (depends on 1)

The touch pad structure as defined in claim 1, wherein the first substrate is made of polycarbonate plastics.

### Claim 3 (depends on 1)

The touch pad structure as defined in claim 1, wherein the first substrate is made of Mylar.

### Claim 4 (depends on 1)

The touch pad structure as defined in claim 1, wherein the first substrate is made of polyester film.

### Claim 5 (depends on 1)

The touch pad structure as defined in claim 1, wherein the first substrate is made of glass.

### Claim 6 (depends on 1)

The touch pad structure as defined in claim 1, wherein the conductor is deposited onto a side of the second substrate with splash process.

### Claim 7 (depends on 1)

The touch pad structure as defined in claim 1, wherein the conductor is deposited onto a side of the second substrate by means of printing.

### Claim 8 (depends on 1)

The touch pad structure as defined in claim 1, wherein the conductor is formed with a plurality of light-penetrable sensing loci and layout of the sensing loci is obtained by means of light resistant agent and etching process.

### Claim 9 (depends on 1)

The touch pad structure as defined in claim 1, wherein the conductor is formed with a plurality of light-penetrable sensing loci and layout of the sensing loci is obtained by means of a negative figure layer covering the second substrate and removing the negative figure layer.

### Claim 10 (depends on 1)

The touch pad structure as defined in claim 1, wherein at least a side of the conductor is formed with a plurality of light-penetrable sensing loci.

### Claim 11 (depends on 1)

The touch pad structure as defined in claim 1, wherein the conductor comprises X-axis sensing loci and Y-axis sensing loci.

### Claim 12 (depends on 1)

The touch pad structure as defined in claim 1, wherein the electrical circuit is integrated with a processor.

### Claim 13 (depends on 1)

The touch pad structure as defined in claim 1, wherein the electrical circuit is connected to a processor.

### Claim 14 (depends on 1)

The touch pad structure as defined in claim 1, wherein the illuminant component is disposed at a periphery side of the first substrate and/or the second substrate or under the first substrate and/or the second substrate.