Touch screen, touch panel, display device and electronic apparatus

• US 10,209,826 B2
• Filed: 04/05/2016
• Issued: 02/19/2019
• Est. Priority Date: 04/21/2015
• Status: Active Grant

• Current Assignee: Trivale Technologies, LLC (Vector Capital Corporation)
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Ono, Takeshi, Nakamura, Tatsuya, Mori, Seiichiro
• Primary Examiner(s): Faragalla, Michael A
• Assistant Examiner(s): Bibbee, Chayce R
• Application Number:
  US15/090,954
• Publication Number:
  US 20160313860A1
• Time in Patent Office: 1,050 Days
• 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 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• 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: H05K 1/0219 Printed shielding conductors for shielding around or between signal conductors, e.g. coplanar or coaxial printed shielding conductors
• CPC Class Codes: H05K 1/162 incorporating printed capacitors
• CPC Class Codes: H05K 2201/0108 Transparent
• CPC Class Codes: H05K 2201/09354 Ground conductor along edge of main surface edge contacts H05K3/403
• CPC Class Codes: H05K 2201/10128 Display

Abstract

A touch screen includes a first shield wiring surrounding a plurality of sensor wirings and a plurality of lead wirings, and capacitors. The distance between the first shield wiring and the outermost lead wiring which is the outermost wiring, out of the plurality of lead wirings, is larger than the intervals between the plurality of lead wirings. The capacitors are constituted by first and second electrodes including extending portions which extend in the extending direction.

Claims

1. A touch screen comprising:

a plurality of sensor wirings extending in a predetermined extending direction;

a plurality of lead wirings which is connected to end portions of said plurality of sensor wirings and extends along an outer periphery of an area in which said plurality of sensor wirings is disposed;

a first shield wiring surrounding said plurality of sensor wirings and said plurality of lead wirings; and

a capacitor which comprises a first electrode and a second electrode which are apart from each other and is connected to said end portions of said sensor wirings;

wherein;

a distance between said first shield wiring and an outermost lead wiring which is an outermost wiring, out of said plurality of lead wirings, is larger than intervals between said plurality of lead wirings,

each of said first electrode and said second electrode includes an extending portion extending in said extending direction,

said first electrode includes, as said extending portion, a connection portion out of said lead wirings connected to said sensor wirings, said connection portion extending along an extension line of said sensor wirings, from a point at which said lead wirings are connected to said sensor wirings, and

said second electrode includes, as said extending portion, a correction capacitance electrode disposed in a direction parallel to said extending direction with respect to said connection portion,

the touch screen further comprising;

a second shield wiring which is disposed outside said area in which said sensor wirings are disposed and is connected to said correction capacitance electrode, wherein

said second shield wiring does not overlap with said lead wiring adjacent to an inner side of said outermost lead wiring in a plan view.

2. The touch screen according to claim 1, wherein

said first electrode and said second electrode are close to each other without overlapping with each other in a plan view.

3. The touch screen according to claim 2, further comprising

an inter-layer insulation film that separates said first electrode and said second electrode from each other,

wherein

an interval between said first electrode and said second electrode in a plan view is equal to or more than three times a film thickness of said inter-layer insulation film.

4. The touch screen according to claim 1, wherein

said first electrode further includes a first pectinate portion extending in a direction perpendicular to said extending direction, and

said second electrode further includes a second pectinate portion which extends in a direction perpendicular to said extending direction and engages with said first pectinate portion of said first electrode in a plan view.

5. The touch screen according to claim 1, wherein

said capacitor is connected to said lead wirings other than said outermost lead wiring.

6. The touch screen according to claim 1, wherein

the touch screen is bonded to a display element through a first adhesive member disposed in such a way as to overlap with said plurality of sensor wirings without overlapping with said plurality of lead wirings, in a plan view.

7. The touch screen according to claim 6, further comprising:

a substrate forming a surface of said touch screen; and

a second adhesive member which bonds said substrate and is disposed in such a way as to overlap with said plurality of sensor wirings and said plurality of lead wirings, without overlapping with said first shield wiring, in a plan view.

8. A touch panel comprising:

the touch screen according to claim 1; and

a detection processing circuit that detects a position on said touch screen, which has been indicated by an indication body, based on a capacitance formed between said indication body and said plurality of sensor wirings.

9. A display device comprising:

the touch panel according to claim 8; and

a display element overlapping with said touch screen in said touch panel.

10. An electronic apparatus comprising:

the display device according to claim 9; and

an electronic element that performs processing an output from said detection processing circuit in said touch panel, as an input signal.