Touch panel

• US 9,772,736 B2
• Filed: 11/12/2014
• Issued: 09/26/2017
• Est. Priority Date: 01/15/2014
• Status: Active Grant

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Inventors: Kikuchi, Maiko
• Primary Examiner(s): Awad, Amr
• Assistant Examiner(s): BRAY, STEPHEN A
• Application Number:
  US14/538,933
• Publication Number:
  US 20150199054A1
• Time in Patent Office: 1,049 Days
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04113 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 touch panel includes an upper electrode substrate having a transparent conductive film formed thereon, a lower electrode substrate having a transparent conductive film formed thereon, two electrodes formed on the transparent conductive film of the upper electrode substrate, two electrodes formed on the transparent conductive film of the lower electrode substrate, an adhesive sheet bonding the upper electrode substrate and the lower electrode substrate to each other such that the transparent conductive films face each other, a film removed area formed on the upper electrode substrate by removing part of the transparent conductive film, the film removed area enclosing the two electrodes on the transparent conductive film of the upper electrode substrate, and an outer rim electrode formed on the transparent conductive film of the upper electrode substrate in such a manner as to surround the film removed area, wherein the film removed area forms a closed loop.

Claims

1. A touch panel, comprising:

an upper electrode substrate having a transparent conductive film formed thereon;

a lower electrode substrate having a transparent conductive film formed thereon;

two electrodes formed on the transparent conductive film of the upper electrode substrate;

two electrodes formed on the transparent conductive film of the lower electrode substrate;

an adhesive sheet bonding the upper electrode substrate and the lower electrode substrate to each other such that the transparent conductive film of the upper electrode substrate and the transparent conductive film of the lower electrode substrate face each other;

a transparent conductive film removed area formed on the upper electrode substrate by removing part of the transparent conductive film of the upper electrode substrate, the transparent conductive film removed area enclosing the two electrodes on the transparent conductive film of the upper electrode substrate; and

an outer rim electrode formed on the transparent conductive film of the upper electrode substrate in such a manner as to surround the transparent conductive film removed area,

wherein the transparent conductive film removed area is an electrically insulating area where the transparent conductive film on the upper electrode substrate is removed so as not to conduct electricity, and the electrically insulating area forms a closed loop.

2. The touch panel as claimed in claim 1, wherein the outer rim electrode forms a closed loop.

3. The touch panel as claimed in claim 1, wherein the transparent conductive films are made of material containing tin-doped indium oxide.

4. The touch panel as claimed in claim 1, further comprising a flexible substrate,

wherein the adhesive sheet has two through holes formed therethrough,

wherein the two electrodes of the upper electrode substrate and two interconnection parts disposed on the lower electrode substrate are coupled to each other via through electrodes formed in the two through holes of the adhesive sheet, respectively, and

wherein an electrode terminal formed on a first surface of the flexible substrate is coupled to the outer rim electrode, and electrode terminals formed on a second surface of the flexible substrate are coupled to the two interconnection parts and to other interconnection parts coupled to the electrodes of the lower electrode substrate, respectively.

5. The touch panel as claimed in claim 1, further comprising two flexible substrates,

wherein the adhesive sheet has two through holes formed therethrough,

wherein the two electrodes of the upper electrode substrate and two interconnection parts disposed on the lower electrode substrate are coupled to each other via through electrodes formed in the two through holes of the adhesive sheet, respectively, and

wherein an electrode terminal formed on a surface of one of the two flexible substrates is coupled to the outer rim electrode, and electrode terminals formed on a surface of the other one of the two flexible substrates are coupled to the two interconnection parts and to other interconnection parts coupled to the electrodes of the lower electrode substrate, respectively.

6. The touch panel as claimed in claim 4, wherein the through electrodes are made of conductive adhesive or conductive paste.