Panel-type input device and electronic apparatus having panel-type input device

• US 8,847,392 B2
• Filed: 02/06/2009
• Issued: 09/30/2014
• Est. Priority Date: 02/08/2008
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited), Fujitsu Limited
• Inventors: Endo, Michiko, Iwata, Hideki, Takei, Fumio, Kashikawa, Takahiro
• Primary Examiner(s): NGUYEN, DUY T V
• Application Number:
  US12/320,899
• Publication Number:
  US 20090201268A1
• Time in Patent Office: 2,062 Days
• Field of Search: 257/750, 438/22
• US Class Current: 257/750
• CPC Class Codes: G01N 27/22 by investigating capacitance
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing
• CPC Class Codes: Y10T 29/49204 Contact or terminal manufacturing

Abstract

A panel-type input device including a pair of electrode plates, each electrode plate having a substrate and a conductive coat provided on a surface of the substrate, the conductive coat of each electrode plate being formed from a conducting polymer. The conductive coat of each electrode plate includes a detecting area adapted to detect a touch input and an inoperative area disposed adjacent to the detecting area, the inoperative area having a surface resistivity higher than a surface resistivity of the detecting area. A parallel electrode pair adapted to apply a voltage to the conductive coat is formed in the detecting area, and conductors connected to the parallel electrode pair are formed in the inoperative area. The inoperative area insulates the conductors from the detecting area.

Claims

1. A panel-type input device comprising:

a pair of electrode plates, each electrode plate having a substrate and a conductive coat provided on a surface of said substrate, said conductive coat of said each electrode plate being formed from a polymer, said pair of electrode plates being assembled with each other in a relative arrangement such that conductive coats of said electrode plates are facing and spaced from each other while permitting a conductive contact between said conductive coats, said conductive coat of said each electrode plate being divided into a detecting area so that a touch input can be detected, and an inoperative area located around said detecting area and having a surface resistivity higher than a surface resistivity of said detecting area;

pairs of electrodes, a first pair corresponding to said detecting area of said conductive coat of a first electrode plate and a second pair corresponding to said detecting area of said conductive coat of a second electrode plate, said electrodes of each pair being provided on a corresponding detecting area at opposing locations on the corresponding detecting area for applying a voltage to the corresponding detecting area; and

conductors, each conductor being connected to one of said electrodes and formed on said inoperative area of said conductive coat of a respective electrode plate,

wherein said each conductor is electrically isolated from said detecting area of the respective electrode plate.

2. The panel-type input device of claim 1, wherein said polymer forming said conductive coat contains an additive adapted to be denatured into either one of an oxidizing substance and a basic substance by ultraviolet light irradiation.

3. The panel-type input device of claim 1, wherein said pair of electrode plates are transparent.

4. An electronic apparatus comprising:

a display unit; and

the panel-type input device of claim 3, said panel-type input device being mounted on a screen of said display unit.