Coordinate detecting device

• US 20070013678A1
• Filed: 05/30/2006
• Published: 01/18/2007
• Est. Priority Date: 07/13/2005
• Status: Active Grant

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Inventors: Nakajima, Takashi, Kondoh, Koichi
• Granted Patent: US 7,825,906 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 2203/04113 Peripheral electrode pattern in resistive digitisers, i.e. electrodes at the periphery of the resistive sheet are shaped in patterns enhancing linearity of induced field
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A coordinate detecting device is disclosed. The coordinate detecting device includes a resistance film, a common electrode which applies electric potential to the resistance film, a voltage supplying section which supplies a voltage to the common electrode, wiring which supplies the voltage to the voltage supplying section, an insulation film disposed between the common electrode and the resistance film, and an electric potential supplying section formed in the insulation film for supplying the electric potential from the common electrode to the resistance film. The coordinate detecting device detects a coordinate of a position on a panel when a user touches the position while an electric potential distribution is generated in the resistance film by being applied electric potential from the common electrode.

Claims

1. A coordinate detecting device, comprising:

a resistance film;

a common electrode which applies electric potential to the resistance film;

a voltage supplying section which supplies a voltage to the common electrode;

wiring which supplies the voltage to the voltage supplying section;

an insulation film disposed between the common electrode and the resistance film; and

an electric potential supplying section formed in the insulation film for supplying the electric potential from the common electrode to the resistance film, wherein

the coordinate detecting device detects a coordinate of a position on a panel when a user touches the position while an electric potential distribution is generated in the resistance film by being applied electric potential from the common electrode.

2. The coordinate detecting device as claimed in claim 1, wherein:

the electric potential supplying section includes openings.

3. The coordinate detecting device as claimed in claim 1, wherein:

the voltage supplying section is formed in a through hole formed in an insulation film disposed above the common electrode and a part of the wiring is disposed in the through hole.

4. The coordinate detecting device as claimed in claim 2, wherein:

the number, and/or the size, and/or the shape of the openings are determined so that the electric potential distribution in the resistance film becomes a predetermined electric potential distribution.

5. The coordinate detecting device as claimed in claim 4, wherein:

the number, and/or the size, and/or the shape of the openings are determined so that an area where the common electrode contacts the resistance film via the openings is large at the end parts of the electric potential supplying section and is small at the center part thereof.

6. The coordinate detecting device as claimed in claim 2, wherein:

the pitch between the openings is the same but the length of the openings is different so that the electric potential distribution in the resistance film becomes a predetermined electric potential distribution.

7. The coordinate detecting device as claimed in claim 2, wherein:

the shape of the openings is the same but the pitch between the openings is different so that the electric potential distribution in the resistance film becomes a predetermined electric potential distribution.

8. The coordinate detecting device as claimed in claim 2, wherein:

the shape of the openings is the same but the electric potential supplying section is curved so that the electric potential distribution in the resistance film becomes a predetermined electric potential distribution.

9. The coordinate detecting device as claimed in claim 2, wherein:

the shape of the openings is the same but the number of the openings is different depending on positions in the electric potential supplying section so that the electric potential distribution in the resistance film becomes a predetermined electric potential distribution.

10. The coordinate detecting device as claimed in claim 9, wherein:

the openings are disposed in plural at the end parts of the electric potential supplying section in the orthogonal direction to the electric potential supplying section.

11. The coordinate detecting device as claimed in claim 2, wherein:

the openings are filled with the common electrode.

12. The coordinate detecting device as claimed in claim 2, wherein:

the openings are filled with a low resistance conductive material.

13. The coordinate detecting device as claimed in claim 1, wherein:

the common electrode is disposed linearly.

14. The coordinate detecting device as claimed in claim 1, wherein:

the common electrode is disposed non-linearly.

15. The coordinate detecting device as claimed in claim 3, wherein:

the wiring is stacked on the common electrode via the insulation film.

16. A coordinate detecting device, comprising:

a resistance film;

a common electrode which applies electric potential to the resistance film;

a voltage supplying section which supplies a voltage to the common electrode;

wiring which supplies the voltage to the voltage supplying section; and

an insulation film disposed between the wiring and the common electrode, wherein

the voltage supplying section is formed in a through hole formed in the insulation film, and the wiring is stacked on the common electrode via the insulation film, and the coordinate detecting device detects a coordinate of a position on a panel when a user touches the position while an electric potential distribution is generated in the resistance film by being applied electric potential from the common electrode.

17. A coordinate detecting device, comprising:

an electric potential supplying layer for supplying electric potential from a common electrode to a resistance film of the coordinate detecting device;

wherein

the electric potential supplying layer includes an insulation film and an electric potential supplying section in the insulation film.