Touch screen covered with wiring pattern having first and second layers

• US 9,477,362 B2
• Filed: 08/02/2013
• Issued: 10/25/2016
• Est. Priority Date: 09/26/2012
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Ono, Takeshi, Nakagawa, Naoki, Agari, Masafumi, Nishioka, Takahiro, Mori, Seiichiro, Miyayama, Takashi, Imamura, Takuji, Nakamura, Tatsuya
• Primary Examiner(s): Sasinowski, Andrew
• Assistant Examiner(s): Lin, Chun-Nan
• Application Number:
  US14/427,080
• Publication Number:
  US 20150242013A1
• Time in Patent Office: 1,180 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 1/16 Constructional details or arrangements
• 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 3/0412 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 touch screen according to a disclosed embodiment may have a small cross capacitance between row-direction wiring and column-direction wiring, and a large change of the cross capacitance when the touch screen is touched by an indication body. A row-direction wiring includes a first portion and a second portion having a smaller wiring width than a wiring width of the first portion. A wiring width of the column-direction wiring is smaller than a length in a row direction of the second portion. The row-direction and column-direction wiring intersect in the second portion, and gaps are formed between the row-direction and column-direction wiring in planar view in an intersection portion. The touch screen further includes floating wiring that fills the gaps in planar view, and the floating wiring is formed in the same layer as the row-direction wiring or the column-direction wiring, and is insulated from both wirings.

Claims

1. A touch screen covered with a wiring pattern made up of a first layer including row-direction wiring and a second layer including column-direction wiring,

wherein said touch screen further comprises floating wiring formed between said row-direction wiring and said column-direction wiring in planar view in an intersection portion of said row-direction wiring and said column-direction wiring,

said floating wiring is formed in the first layer,

said floating wiring is insulated from said row-direction wiring and said column-direction wiring,

said touch screen further comprises:

column-direction dummy wiring formed in the first layer in a same area as said column-direction wiring in planar view; and

row-direction dummy wiring formed in the second layer in a same area as said row-direction wiring and said floating wiring in planar view,

a mesh of said row-direction wiring and a mesh of said column-direction wiring are arranged so as to be displaced in planar view,

the mesh of said column-direction wiring and a mesh of said column-direction dummy wiring are arranged so as to be displaced in planar view,

the mesh of said row-direction wiring and a mesh of said row-direction dummy wiring are arranged so as to be displaced in planar view, and

a mesh of floating wiring and the mesh of said row-direction dummy wiring are arranged so as to be displaced in planar view,

wherein said row-direction wiring is made up of a first portion and a second portion having a wiring width smaller than a wiring width of the first portion,

a wiring width of said column-direction wiring is smaller than a length in a row direction of said second portion of said row-direction wiring,

said row-direction wiring and said column-direction wiring intersect in said second portion of said row-direction wiring.

2. The touch screen according to claim 1,

wherein said floating wiring includes a disconnection portion that divides said floating wiring, and

said disconnection portion is formed so as to extend in a longitudinal direction of said floating wiring.

3. The touch screen according to claim 2,

wherein said floating wiring is insulated by being divided from peripheral wiring, and

said touch screen further comprises disconnection portion wiring that fills said divided portion and said disconnection portion in planar view, and

said disconnection portion wiring is formed in the second layer.

4. The touch screen according to claim 1, wherein said wiring pattern is made by repeating a unit pattern.

5. The touch screen according to claim 4, wherein at least part of said unit pattern includes circular arc shaped wiring.

6. The touch screen according to claim 4, wherein in said unit pattern, all wiring is formed of circular arc-shaped wiring.

7. The touch screen according to claim 4, wherein said unit pattern includes S-shaped wirings intersecting with each other and circular wiring around an intersection of said S-shaped wirings.