Touch panel and method for manufacturing the same

• US 20050118922A1
• Filed: 09/20/2004
• Published: 06/02/2005
• Est. Priority Date: 11/27/2003
• Status: Abandoned Application

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Inventors: Endo, Michiko
• Application Number:
  US10/943,913
• Publication Number:
  US 20050118922A1
• Time in Patent Office: Days
• US Class Current: 445/24
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

The present invention relates to a resistive-film type touch panel using a transparent conductive polymer film as a transparent electrode film. The touch panel includes a transparent resin sheet and a glass substrate having an ITO film formed thereon. After a solution having a transparent conductive polymer dispersed in a solvent is applied to the undersurface of the transparent resin sheet, the solution is heated and dried in order to form a transparent conductive polymer film. The ITO film and transparent conductive polymer film serve as transparent electrode films that are opposed to each other. When the transparent resin sheet is pressed, the films touch each other. Consequently, a change in resistance corresponding to the pressed position can be detected.

Claims

1. A touch panel having first and second transparent electrode films formed on the internal surfaces of first and second substrates, which are opposed to each other, with a plurality of dot spacers between them, and detecting a change in resistance corresponding to a pressed position, wherein

at least one of said first and second transparent electrode films is formed by coating said substrate with a transparent conductive polymer.

2. A touch panel according to claim 1, wherein said first transparent electrode film is realized with an ITO film, and said second transparent electrode film is formed by coating said second substrate with said transparent conductive polymer.

3. A touch panel according to claim 1, wherein said first and second transparent electrode films are formed by coating said first and second substrates with said transparent conductive polymer.

4. A touch panel according to claim 2, wherein said first substrate is made of a glass, and said second substrate is made from a transparent resin sheet.

5. A touch panel according to claim 2, wherein said first and second substrates are made from transparent resin sheets.

6. A touch panel according to claim 5, wherein a third substrate is bonded to the external surface of said first or second substrate.

7. A touch panel according to claim 1, wherein said first or second transparent electrode film is a transparent conductive polymer film formed all over one surface of said first or second substrate, and electrodes made from a conductive pattern or electrodes realized with a wiring pattern are layered on the perimeter of said transparent conductive polymer film.

8. A touch panel according to claim 1, wherein said first or second transparent electrode film is a transparent conductive polymer film layered all over one surface of said first or second substrate, and electrodes realized with a conductive pattern or electrodes realized with a wiring pattern are layered on the perimeter of one surface of said first or second substrate between said first or second substrate and said transparent conductive polymer film.

9. A touch panel according to claim 1, wherein said first or second transparent electrode film is a laminated body composed of an ITO film and a transparent conductive polymer film.

10. A touch panel according to claim 1, wherein said transparent electrode film formed on at least one of the sides of said first or second substrate includes separate transparent electrode films made from transparent conductive polymer films layered on a plurality of regions, and said electrode films formed on said plurality of regions can mutually independently detect a change in resistance corresponding to a pressed position.

11. A touch panel according to claim 10, wherein said transparent electrode films are separated from one another along one of the surfaces of said first or second substrate.

12. A touch panel according to claim 1, wherein the surface of said transparent conductive polymer film has microscopic irregularities.

13. A touch panel having first and second transparent electrode films formed on the internal surfaces of first and second substrates, which are opposed to each other, with a plurality of dot spacers between them, and detecting a change in resistance corresponding to a pressed position, wherein:

at least one of said first and second transparent electrode films is on pressing side, and the transparent electrode film on pressing side is made from an ITO film; and

a transparent conductive polymer film is layered on the perimeter of said transparent electrode film so that it will have a predetermined width.

14. A touch panel manufacturing method for producing a touch panel which can detect a change in resistance corresponding to a pressed position, by forming first and second transparent electrode films on the internal surfaces of first and second substrates and then opposing said first and second substrates to each other with a plurality of dot spacers between them, wherein:

at least one of said first and second transparent electrode films is layered by applying a transparent conductive polymer, which is dispersed in a solvent, to the surface of said substrate, and then heating and drying the transparent conductive polymer.

15. A touch panel manufacturing method according to claim 14, wherein said first transparent electrode film is formed on the internal surface of said first substrate using an ITO film, and said second transparent electrode film is layered by applying a transparent conductive polymer, which is dispersed in a solvent, to the internal surface of said second substrate, and then heating and drying the transparent conductive polymer.

16. A touch panel manufacturing method according to claim 14, wherein said first transparent electrode film is formed by applying said transparent conductive polymer, which is dispersed in a solvent, to the internal surface of said first substrate, and then heating and drying said transparent conductive polymer material;

and said transparent electrode film is layered by applying said transparent conductive polymer, which is dispersed in a solvent, to the internal surface of said second substrate, and then heating and drying said transparent conductive polymer.

17. A touch panel manufacturing method according to claim 15, wherein application of said transparent conductive polymer to said substrate is performed on a predetermined region according to a pattern through printing.

18. A touch panel manufacturing method according to claim 15, wherein said first transparent electrode film is formed on the surface of a glass substrate, and said second transparent electrode film is formed on the surface of a transparent resin sheet.

19. A touch panel manufacturing method according to claim 15, wherein said first and second transparent electrode films are formed on the respective surfaces of transparent resin sheets.

20. A touch panel manufacturing method according to claim 19, wherein said first and second transparent electrode films are layered by applying said transparent conductive polymer, which is dispersed in a solvent, to the surface of a continuous transparent resin sheet, and then heating and drying said transparent conductive polymer;

and said transparent resin sheet is folded so that said first and second transparent electrode films will be opposed to each other with said dot spacers between them.

21. A touch panel manufacturing method according to claim 15 wherein, after said first or second transparent electrode film is layered by coating said substrate with said transparent conductive polymer, an electrode pattern or a wiring pattern is formed on the perimeter of said first or second transparent electrode film.

22. A touch panel manufacturing method according to claim 15 wherein, after an electrode pattern or a wiring pattern is formed on the perimeter of said first or second substrate, said first or second transparent electrode film is layered by coating said first or second substrate and said electrode pattern or wiring pattern with said transparent conductive polymer.

23. A touch panel manufacturing method according to claim 15 wherein, after said first or second transparent electrode film is formed by forming an ITO film on the surface of said first or second substrate and then coating said ITO film with said transparent conductive polymer.

24. A touch panel manufacturing method according to claim 15, wherein at least one of said first and second transparent electrode films includes a plurality of separate electrode films formed by applying said transparent conductive polymer to a plurality of regions of said substrate.

25. A touch panel manufacturing method according to claim 15, wherein the surface of said first or second transparent electrode film formed by coating said substrate with said transparent conductive polymer has microscopic irregularities.

26. A touch panel manufacturing method according to claim 25, wherein at least one of said first and second transparent electrode films is layered by applying a transparent conductive polymer, which is dispersed in a solvent, to the surface of said substrate, then heating and drying said transparent conductive polymer with a plate, of which a surface is machined to have irregularities or look like a mesh, superposed on the surface of said substrate to which said transparent conductive polymer is applied, and finally detaching said plate.

27. A touch panel manufacturing method according to claim 25, wherein at least one of said first and second transparent electrode films is layered by applying a transparent conductive polymer and inorganic particles, which are dispersed in a solvent, to the surface of said substrate, and then heating and drying said transparent conductive polymer and inorganic particles, so that the surface of said electrode film will have microscopic irregularities.

29. A touch panel manufacturing method according claim 16 wherein, after said first or second transparent electrode film is formed by forming an ITO film on the surface of said first or second substrate and then coating said ITO film with said transparent conductive polymer.

30. A touch panel manufacturing method according claim 17 wherein, after said first or second transparent electrode film is formed by forming an ITO film on the surface of said first or second substrate and then coating said ITO film with said transparent conductive polymer.

31. A touch panel manufacturing method according claim 18 wherein, after said first or second transparent electrode film is formed by forming an ITO film on the surface of said first or second substrate and then coating said ITO film with said transparent conductive polymer.

32. A touch panel manufacturing method according claim 19 wherein, after said first or second transparent electrode film is formed by forming an ITO film on the surface of said first or second substrate and then coating said ITO film with said transparent conductive polymer.

33. A touch panel manufacturing method according claim 20 wherein, after said first or second transparent electrode film is formed by forming an ITO film on the surface of said first or second substrate and then coating said ITO film with said transparent conductive polymer.

28. A touch panel manufacturing method for producing a touch panel, which can detect a change in resistance corresponding to a pressed position, by forming first and second transparent electrode films on the internal surfaces of first and second substrates, and then opposing said first and second substrates to each other with a plurality of dot spacers between them, wherein:

at least one of said first and second transparent electrode films is formed on said substrate using an ITO film; and

after a transparent conductive polymer dispersed in a solvent is applied to the edges of said touch panel that have a predetermined width, that is, to the perimeter of said ITO film, said transparent conductive polymer is heated and dried.