Touch panel and display device

• US 8,704,796 B2
• Filed: 04/21/2011
• Issued: 04/22/2014
• Est. Priority Date: 04/22/2010
• Status: Active Grant

• Current Assignee: Paneltouch Technologies LLC (Touch Display LLC)
• Original Assignee: Japan Display Incorporated, Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Nishitani, Shigeyuki, Anno, Kouichi
• Primary Examiner(s): Beck, Alexander S
• Assistant Examiner(s): BOGALE, AMEN W
• Application Number:
  US13/091,422
• Publication Number:
  US 20110261010A1
• Time in Patent Office: 1,097 Days
• US Class Current: 345/174
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• 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

Abstract

Provided is an electrostatic capacitance type touch panel in which lead lines are alternately connected to one end portions of a plurality of Y electrodes, the respective lead lines are formed outside an effective touch region, and are connected to terminals which are formed corresponding to the respective lead lines, inspection pads which are connected with the Y electrodes respectively are formed over end portions of the respective Y electrodes on a side where the lead lines are not connected to the respective Y electrodes, the plurality of inspection pads are formed in a region where the lead lines are formed outside the effective touch region, a shield electrode is provided between the lead lines and the respective inspection pads, and a voltage equal to a drive voltage supplied to the Y electrodes is supplied to the shield electrode.

Claims

1. An electrostatic capacitance type touch panel comprising:

a substrate;

a plurality of X electrodes which are formed over the substrate, the plurality of X electrodes extending in a second direction and being arranged in a first direction which intersects with the second direction; and

a plurality of Y electrodes which are formed over the substrate, the plurality of Y electrodes extending in the first direction while intersecting with the X electrodes and being arranged in the second direction;

a drive voltage being supplied to the plurality of Y electrodes from one side of the plurality of Y electrodes, wherein

lead lines are connected alternately to one and an other end portions of the plurality of Y electrodes at first and second sides of the substrate, respectively,

the respective lead lines are formed outside an effective touch region, and are connected to terminals which are formed on a third side of the substrate and are formed corresponding to the respective lead lines,

inspection pads which are connected with the Y electrodes are formed alternately at the one and the other end portions of the respective Y electrodes at the second and first sides of the substrate, respectively, on the side where the corresponding lead lines are not connected to the respective Y electrodes,

at least one of the plurality of inspection pads is formed to overlap with at least two of the lead lines in a region where the lead lines are formed outside the effective touch region,

a shield electrode is provided between the lead lines and the respective inspection pads, and

a voltage equal to the drive voltage supplied to the Y electrodes is supplied to the shield electrode.

2. The touch panel according to claim 1, wherein the respective X electrodes, the respective Y electrodes, the respective inspection pads and the shield electrode are formed of a transparent conductive film, and

the respective lead lines are formed of a metal layer.

3. The touch panel according to claim 1, wherein the respective X electrodes and the respective Y electrodes are formed by alternately arranging pad portions and fine line portions in an extending direction thereof respectively,

the pad portions of the respective X electrodes and the pad portions of the respective Y electrodes are arranged without overlapping with each other as viewed in a plan view, and the fine line portions of the respective X electrodes and the fine line portions of the respective Y electrodes intersect with each other three-dimensionally,

the pad portions and the fine line portions of the respective X electrodes and the pad portions of the respective Y electrodes are formed over the same layer, and

the fine line portions of the respective Y electrodes are formed below the pad portions of the respective Y electrodes, and are connected to the pad portions of the respective Y electrodes via contact holes formed in an insulation film interposed between the pad portions of the respective Y electrodes and the fine line portions of the respective Y electrodes.

4. The touch panel according to claim 3, wherein the respective inspection pads are formed over the same layer over which the pad portions of the Y electrodes are formed, and

the shield electrode is formed between the layer over which the pad portions of the Y electrodes are formed and a layer over which the fine line portions of the Y electrodes are formed.

5. The touch panel according to claim 1, wherein the respective X electrodes and the respective Y electrodes are formed by alternately arranging pad portions and fine line portions in an extending direction thereof,

the pad portions of the respective X electrodes and the pad portions of the respective Y electrodes are arranged without overlapping with each other as viewed in a plan view, and the fine line portions of the respective X electrodes and the fine line portions of the respective Y electrodes intersect with each other three-dimensionally, and

the X electrodes and the Y electrodes are formed over different layers with an insulation layer interposed therebetween, and the X electrodes are formed below the Y electrodes.

6. The touch panel according to claim 5, wherein the respective inspection pads are formed over the same layer over which the pad portions of the Y electrodes are formed, and

the shield electrode is formed between the layer over which the Y electrodes are formed and the layer over which the X electrodes are formed.