Electroconductive sheet and touch panel

• US 9,312,048 B2
• Filed: 08/14/2013
• Issued: 04/12/2016
• Est. Priority Date: 02/24/2011
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Ichiki, Akira
• Primary Examiner(s): Yodichkas, Aneeta
• Assistant Examiner(s): Oliver, Gerald
• Application Number:
  US13/966,898
• Publication Number:
  US 20130327560A1
• Time in Patent Office: 972 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• 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: H01B 5/00 Non-insulated conductors or conductive bodies characterised by their form

Abstract

An electroconductive sheet and a touch panel having a first electroconductive section and a second electroconductive section, the second electroconductive section being disposed on the display-panel side. The first electroconductive section has a plurality of first electroconductive patterns arranged in the x-direction, a plurality of first large grids being respectively connected to the first electroconductive patterns. The second electroconductive section has a plurality of second electroconductive patterns arranged in the y-direction, a plurality of second large grids being respectively connected to the second electroconductive patterns. The area occupied by thin metal wires in the second electroconductive patterns is larger than the area occupied by thin metal wires in the first electroconductive patterns. The area occupied by thin metal wires in the second large grids is larger than the area occupied by thin metal wires in the first large grids.

Claims

1. A conductive sheet, which is used on a display panel of a display device, comprising a first conductive part disposed closer to an input operation surface and a second conductive part disposed closer to the display panel, wherein

the first conductive part and the second conductive part overlap with each other,

the first conductive part contains a plurality of first conductive patterns composed of thin metal wires,

the first conductive patterns are arranged in one direction and each connected to a plurality of first electrodes,

the second conductive part contains a plurality of second conductive patterns composed of the thin metal wires,

the second conductive patterns are arranged in a direction perpendicular to the one direction of the first conductive patterns and each connected to a plurality of second electrodes,

an occupation area of the second conductive patterns is larger than an occupation area of the first conductive patterns, and

the thin metal wires have a line width of 6 μ

m or less and a line pitch of 200 μ

m or more and 500 μ

m or less, or alternatively the thin metal wires have a line width of more than 6 μ

m but at most 7 μ

m and a line pitch of 300 μ

m or more and 400 μ

m or less, wherein

the second electrodes each contain a combination of a plurality of first lattices,

the first electrodes each contain a combination of a plurality of second lattices larger than the first lattices,

the second lattices each have a length component, and

a length of the length component is a real-number multiple of a side length of the first lattice.

2. The conductive sheet according to claim 1, wherein

the thin metal wires have a line width of 5 μ

m or less and a line pitch of 200 μ

m or more and 400 μ

m or less, or alternatively the thin metal wires have a line width of more than 5 μ

m but at most 7 μ

m and a line pitch of 300 μ

m or more and 400 μ

m or less.

3. The conductive sheet according to claim 1, further comprising a substrate, wherein

the first conductive part and the second conductive part are arranged facing each other with the substrate interposed therebetween, and the substrate has a thickness of 75 μ

m or more and 350 μ

m or less.

4. The conductive sheet according to claim 1, wherein the conductive sheet satisfies the condition of 1<

A2/A1≦

20, where the first conductive patterns have an occupation area A1 and the second conductive patterns have an occupation area A2.

5. The conductive sheet according to claim 1, wherein the conductive sheet satisfies the condition of 1<

A2/A1≦

10, where the first conductive patterns have an occupation area A1 and the second conductive patterns have an occupation area A2.

6. The conductive sheet according to claim 1, wherein the conductive sheet satisfies the condition of 2 A2/A1≧

10, where the first conductive patterns have an occupation area A1 and the second conductive patterns have an occupation area A2.

7. The conductive sheet according to claim 1, wherein

the first conductive part and/or the second conductive part contain auxiliary electrodes composed of the thin metal wires,

the auxiliary electrodes are disposed between the first electrodes and the second electrodes,

the second conductive part contains additional auxiliary electrodes composed of the thin metal wires, and

the additional auxiliary electrodes are disposed in positions corresponding to the first electrodes.

8. The conductive sheet according to claim 7, wherein the occupation area of the additional auxiliary electrodes is ½

or less of the occupation area of the second electrodes.

9. The conductive sheet according to claim 7, wherein the additional auxiliary electrodes, which are composed of the thin metal wires and disposed in the positions corresponding to the first electrodes, are combined with the first electrodes in the first conductive part to form lattice patterns.

10. The conductive sheet according to claim 7, wherein the thin metal wires are arranged into a mesh shape in the first electrodes.

11. The conductive sheet according to claim 7, wherein

the thin metal wires in the additional auxiliary electrodes, which are disposed in the positions corresponding to the first electrodes, have a straight line shape.

12. The conductive sheet according to claim 11, wherein

the second electrodes each contain a combination of a plurality of the first lattices, and

a length of the thin metal wire having the straight line shape in the additional auxiliary electrodes is a real-number multiple of a side length of the first lattice.

13. The conductive sheet according to claim 7, wherein

the thin metal wires in the additional auxiliary electrodes, which are disposed in the positions corresponding to the first electrodes, have a mesh shape.

14. The conductive sheet according to claim 13, wherein

the second electrodes each contain a combination of a plurality of the first lattices,

the additional auxiliary electrodes each contain a combination of a plurality of the second lattices larger than the first lattices,

the second lattices each have a length component, and

a length of the length component is a real-number multiple of a side length of the first lattice.

15. The conductive sheet according to claim 7, further comprising a substrate, wherein

the first conductive part and the second conductive part are arranged facing each other with the substrate interposed therebetween,

the first electrodes and the second electrodes each have a mesh pattern,

auxiliary patterns of the additional auxiliary electrodes composed of the thin metal wires are disposed between the second electrodes in the positions corresponding to the first electrodes,

the second electrodes are arranged adjacent to the first electrodes as viewed from above,

the first electrodes overlap with the auxiliary patterns to form combined patterns, and

the combined patterns each contain a combination of mesh shapes.

16. The conductive sheet according to claim 15, wherein

the second electrodes each contain a first large lattice containing a combination of a plurality of first small lattices,

the first electrodes each contain a second large lattice containing a combination of a plurality of second small lattices larger than the first small lattices,

the first large lattices in the combined patterns are arranged adjacent to the second large lattices,

the first large lattices overlap with the auxiliary patterns to form the combined patterns, and

the combined patterns each contain a combination of two or more first small lattices.

17. The conductive sheet according to claim 1, further comprising a substrate, wherein

the first conductive part and the second conductive part are arranged facing each other with the substrate interposed therebetween.

18. The conductive sheet according to claim 17, wherein

the first conductive part is formed on one main surface of the substrate, and

the second conductive part is formed on another main surface of the substrate.

19. A touch panel comprising a conductive sheet, which is used on a display panel of a display device, wherein

the conductive sheet has a first conductive part disposed closer to an input operation surface and a second conductive part disposed closer to the display panel,

the first conductive part and the second conductive part overlap with each other,

the first conductive part contains a plurality of first conductive patterns composed of thin metal wires,

the first conductive patterns are arranged in one direction and each contain a plurality of first electrodes connected,

the second conductive part contains a plurality of second conductive patterns composed of the thin metal wires,

the second conductive patterns are arranged in a direction perpendicular to the one direction of the first conductive patterns and each contain a plurality of second electrodes connected,

the occupation area of the second conductive patterns is larger than the occupation area of the first conductive patterns, and

the thin metal wires have a line width of 6 μ

m or less and a line pitch of 200 μ

m or more and 500 μ

m or less, or alternatively the thin metal wires have a line width of more than 6 μ

m but at most 7 μ

m and a line pitch of 300 μ

m or more and 400 μ

m or less, wherein

the second electrodes each contain a combination of a plurality of first lattices,

the first electrodes each contain a combination of a plurality of second lattices larger than the first lattices,

the second lattices each have a length component, and

a length of the length component is a real-number multiple, of a side length of the first lattice.