Touchscreen

• US 9,395,855 B2
• Filed: 12/02/2013
• Issued: 07/19/2016
• Est. Priority Date: 12/04/2012
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Nakamura, Tatsuya, Imamura, Takuji, Ono, Takeshi, Nakagawa, Naoki, Agari, Masafumi, Mori, Seiichiro, Miyayama, Takashi
• Primary Examiner(s): Giesy, Adam R
• Assistant Examiner(s): Heyi, Henok
• Application Number:
  US14/094,499
• Publication Number:
  US 20140152916A1
• Time in Patent Office: 960 Days
• Field of Search: None
• US Class Current: 1/1
• 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 3/0412 Digitisers structurally integrated in a display
• 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

A touchscreen of the present invention is covered by wiring patterns of a row-directional line and a column-directional line being upper and lower two layers. A step height that is produced by an upper electrode riding on a lower electrode when a floating electrode is provided at a region adjacent to the row-directional line and the column-directional line is suppressed.

Claims

1. A touchscreen covered by mesh-shaped wiring patterns of a row-directional line and a column-directional line being upper and lower two layers, wherein

said row-directional line or said column-directional line has its width narrowed at a crossing portion where said row-directional line and said column-directional line cross each other,

said row-directional line or said column-directional line includes a floating electrode provided to be adjacent to a region where said row-directional line and said column-directional line overlap each other in a planar view,

said floating electrode is insulated from surrounding lines, said floating electrode including a disconnecting portion dividing said floating electrode, said floating electrode further including

a first floating electrode of said mesh-shape formed at the same layer as that of said row-directional line,

a second floating electrode of said mesh-shape formed at the same layer as that of said column-directional line,

a column-directional dummy line of said mesh-shape formed at the same layer as that of said row-directional line, in the same region as that of the column-directional line in a planar view, and

a row-directional dummy line of said mesh-shape formed at the same layer as that of said column-directional line, in the same region as that of the row-directional line in a planar view, wherein

the mesh of said row-directional line and the mesh of said column-directional line are arranged as being complementarily displaced in a planar view,

the mesh of said column-directional line and the mesh of said column-directional dummy line are arranged as being complementarily displaced in a planar view,

the mesh of said row-directional line and the mesh of said row-directional dummy line are arranged as being complementarily displaced in a planar view, and

the mesh of said first floating electrode and the mesh of said second floating electrode are arranged as being complementarily displaced in a planar view.

2. The touchscreen according to claim 1, wherein

an interlayer insulating film is formed between said row-directional line and said column-directional line, and

a surface of said interlayer insulating film is planarized.

3. The touchscreen according to claim 1, wherein

in said disconnecting portion,

one of said first floating electrode and said second floating electrode located at an upper layer than the other has no site riding on the other one at a lower layer.

4. The touchscreen according to claim 1, wherein the following ones of number of step height are equal:

the number of step height that is produced when higher one of said first floating electrode and said second floating electrode rides on the other lower one, in one crossing portion in said disconnecting portion;

the number of step height that is produced when higher one of said row-directional line and said column-directional line rides on the other lower one, in one crossing portion in a region where said row-directional line and said column-directional line overlap each other in a planar view;

the number of step height that is produced when higher one of said column-directional line and said column-directional dummy line rides on the other lower one in one crossing portion, in the same region as said column-directional line in a planar view; and

the number of step height that is produced when higher one of said row-directional line and said row-directional dummy line rides on the other lower one in one crossing portion, in the same region as said row-directional line in a planar view.