Display device with touch panel

• US 8,941,616 B2
• Filed: 01/28/2014
• Issued: 01/27/2015
• Est. Priority Date: 04/22/2008
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Japan Display Incorporated, Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Teramoto, Masahiro
• Primary Examiner(s): Wong, K.
• Application Number:
  US14/166,054
• Publication Number:
  US 20140139485A1
• Time in Patent Office: 364 Days
• Field of Search: None
• US Class Current: 345/174
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04111 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 3/03547 Touch pads, in which fingers can move on a surface
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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 3/047 using sets of wires, e.g. crossed wires
• CPC Class Codes: H01L 21/02063 the processing being the formation of vias or contact holes
• CPC Class Codes: H01L 21/0425 Making electrodes
• CPC Class Codes: H01L 21/044 Conductor-insulator-semiconductor electrodes
• CPC Class Codes: H01L 21/311 Etching the insulating layers by chemical or physical means H01L21/31058 takes precedence
• CPC Class Codes: H01L 21/3213 Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
• CPC Class Codes: H05K 3/0017 Etching of the substrate by chemical or physical means

Abstract

A touch panel includes a substrate, a plurality of first electrodes extending in a first direction on the substrate and being disposed in parallel in a second direction intersecting the first direction, and a plurality of second electrodes intersecting the plurality of first electrodes, extending in the second direction, and being disposed in parallel in the first direction. Each of the plurality of first electrodes includes a first portion and a second portion with the second portion of first electrode and the second electrode being made of a first conductive film, and the first portion of the first electrode being made of a second conductive film.

Claims

1. A touch panel comprising:

a substrate, a plurality of first electrodes extending in a first direction on the substrate and being disposed in parallel in a second direction intersecting the first direction, and a plurality of second electrodes intersecting the plurality of first electrodes, extending in the second direction, and being disposed in parallel in the first direction;

wherein each of the plurality of first electrodes includes a first portion and a second portion;

wherein the second portion of first electrode and the second electrode are made of a first conductive film, and the first portion of the first electrode is made of a second conductive film;

wherein an insulating film which is made of negative resist is formed between the first conductive film and the second conductive film,

wherein a contact portion which is formed above the second portion of the first electrode is exposed by removal of the insulating film,

wherein the insulating film includes an interlayer portion which is formed at an intersection of the first portion of the first electrode and the second electrode, and

wherein the first portion of the first electrode is formed above the interlayer portion and electrically connects between two adjacent contact portions.

2. A touch panel according to claim 1, wherein the first portion of the first electrode is formed above the plurality of second electrodes.

3. A touch panel according to claim 1, wherein the second portion of the first electrode is a square electrode, the contact portion is formed at a corner of the square electrode.

4. A touch panel according to claim 1, wherein:

each of the plurality of second electrodes includes a portion wider than a portion intersecting the first portion of the first electrode, between adjacent two electrodes of the plurality of first electrodes.

5. A touch panel according to claim 1, wherein the plurality of first electrodes and the plurality of second electrodes are made of transparent conductive materials.

6. A touch panel according to claim 1, further comprising a protective film formed on the substrate to cover the plurality of first electrodes and the plurality of second electrodes.

7. A touch panel comprising:

a substrate;

a plurality of first electrodes extending in a first direction on the substrate, and a plurality of second electrodes intersecting the plurality of first electrodes;

wherein each of the plurality of first electrodes includes a first portion and a second portion;

wherein the second portion of first electrode and the second electrode are made of a first conductive layer;

wherein the first portion of the first electrode is made of a second conductive layer;

wherein the second portion of the first electrode is a square electrode;

wherein an insulating film which is made of negative resist is formed between the first conductive layer and the second conductive layer;

wherein a contact portion which is formed above the second portion of the first electrode is formed at a corner of the square electrode;

wherein the insulating film includes an interlayer portion which is formed at an intersection of the first portion of the first electrode and the second electrode; and

wherein the first portion of the first electrode is formed above the interlayer portion and electrically connects between two adjacent contact portions.

8. A touch panel according to claim 7, wherein the first portion of the first electrode is formed above the plurality of second electrodes.

9. A touch panel according to claim 7, wherein each of the plurality of second electrodes includes a portion wider than a portion intersecting the first portion of the first electrode, between adjacent two electrodes of the plurality of first electrodes.

10. A touch panel according to claim 7, wherein each of the plurality of first electrodes includes the second portion of the first electrode being larger in width than a width of the first portion of the first electrode, between adjacent two electrodes of the plurality of second electrodes.

11. A touch panel according to claim 7, wherein the plurality of first electrodes and the plurality of second electrodes are made of transparent conductive materials.

12. A touch panel according to claim 7, further comprising a protective film formed on the substrate to cover the plurality of first electrodes and the plurality of second electrodes.