Touch panel and display device

Patent metadata

Field	Value
Publication number	US-11537246-B2
Application number	US-202016943042-A
Country	US
Kind code	B2
Filing date	Jul 30, 2020
Priority date	Aug 8, 2019
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

A touch panel includes a cover panel, a touch sensor substrate in which a sensor electrode for detecting a position of a pointing object is disposed in a detection region, an adhesive agent being disposed between the cover panel and the touch sensor substrate, a first electrode being disposed in an outer region of a region corresponding to the detection region of a second surface of the cover panel, and a second electrode being disposed to overlap a part of the first electrode in plan view in an outer region of the detection region of a third surface of the touch sensor substrate.

First claim

What is claimed is:

1. A touch panel comprising:
a cover panel including a first surface to be touched by a pointing object and a second surface opposite to the first surface;
a touch sensor substrate including a third surface facing the second surface of the cover panel, in which a sensor electrode for detecting a position of the pointing object is disposed in a detection region of the third surface;
an adhesive agent being disposed between the cover panel and the touch sensor substrate;
a first electrode being disposed in an outer region of a region corresponding to a detection region of the second surface of the cover panel, such that at least a portion of the first electrode is external of the adhesive agent; and
a second electrode being disposed to overlap a part of the first electrode in plan view in an outer region of the detection region of the third surface of the touch sensor substrate, and being electrically isolated from the sensor electrode, wherein
the second electrode is disposed at one or more corner portions of the touch sensor substrate,
the second electrode includes a reference electrode and a detection electrode having distances from the detection region of the third surface, the distances being different from each other, and
a press of the pointing object on the first surface of the cover panel is detected based on a variation in a calculated capacitance difference being a difference between an electrostatic capacitance formed between the first electrode and the reference electrode and an electrostatic capacitance formed between the first electrode and the detection electrode.

2. The touch panel according to claim 1 , wherein
at least a part of one electrode of the reference electrode and the detection electrode closer to the detection region of the third surface overlaps the adhesive agent in plan view.

3. The touch panel according to claim 1 , wherein
an area of one electrode of the reference electrode and the detection electrode closer to the detection region of the third surface is smaller than an area of another electrode.

4. The touch panel according to claim 1 , wherein
the adhesive agent overlaps a lead wire connecting an external terminal disposed on the third surface of the touch sensor substrate and the reference electrode in plan view, and
overlaps a lead wire connecting the external terminal and the detection electrode in plan view.

5. The touch panel according to claim 1 , wherein
the adhesive agent does not overlap a lead wire connecting an external terminal disposed on the third surface of the touch sensor substrate and the reference electrode in plan view, and does not overlap a lead wire connecting the external terminal and the detection electrode in plan view.

6. The touch panel according to claim 1 , further comprising
an insulation layer being configured to insulate the first electrode to which an excitation voltage signal is applied and a ground potential.

7. A display device, wherein
the touch panel according to claim 1 is provided on a display surface side.

8. A touch panel comprising:
a cover panel including a first surface to be touched by a pointing object and a second surface opposite to the first surface;
a touch sensor substrate including a third surface facing the second surface of the cover panel, in which a sensor electrode for detecting a position of the pointing object is disposed in a detection region of the third surface;
an adhesive agent being disposed between the cover panel and the touch sensor substrate;
a first electrode being disposed in an outer region of a region corresponding to a detection region of the second surface of the cover panel;
a second electrode being disposed to overlap a part of the first electrode in plan view in an outer region of the detection region of the third surface of the touch sensor substrate, and being electrically isolated from the sensor electrode; and
a third electrode being disposed to overlap a part of the first electrode and the second electrode in plan view in an outer region of a region corresponding to a detection region of a fourth surface opposite to the third surface of the touch sensor substrate, wherein
the second electrode is disposed at one or more corner portions of the touch sensor substrate,
a first excitation voltage signal is applied to the first electrode,
a second excitation voltage signal having phase opposite to phase of the first excitation voltage signal is applied to the third electrode, and
a press of the pointing object on the first surface of the cover panel is detected, based on variation of electrostatic capacitance between the first electrode and the second electrode.

9. The touch panel according to claim 8 , wherein
voltage amplitude of an excitation voltage signal of at least any one of the first excitation voltage signal and the second excitation voltage signal is adjusted.

10. A display device, wherein
the touch panel according to claim 8 is provided on a display surface side.

11. A touch panel comprising:
a cover panel including a first surface to be touched by a pointing object and a second surface opposite to the first surface;
a touch sensor substrate including a third surface facing the second surface of the cover panel, in which a sensor electrode for detecting a position of the pointing object is disposed in a detection region of the third surface;
an adhesive agent being disposed between the cover panel and the touch sensor substrate;
a first electrode being disposed in an outer region of a region corresponding to a detection region of the second surface of the cover panel; and
a second electrode being disposed to overlap a part of the first electrode in plan view in an outer region of the detection region of the third surface of the touch sensor substrate, and being electrically isolated from the sensor electrode, wherein
the second electrode is disposed at one or more corner portions of the touch sensor substrate,
the second electrode includes a reference electrode and a detection electrode having distances from the detection region of the third surface, the distances being different from each other, and an entirety of the reference electrode is closer than the detection electrode to a center of the touch sensor substrate in plan view, and
a press of the pointing object on the first surface of the cover panel is detected based on variation of difference capacitance between electrostatic capacitance between the first electrode and the reference electrode and electrostatic capacitance between the first electrode and the detection electrode.

Assignees

• Mitsubishi Electric Corp

Inventors

• Mori Seiichiro
• Ono Takeshi
• Orita Tae
• Sasaki Yuichi
• NIDAIRA Masaya
• Shimasaki Yusuke

Classifications

• G06F3/0443 Primary

  using a single layer of sensing electrodes · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/0447

  Position sensing using the local deformation of sensor cells · CPC title

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• G06F3/04142

  the force sensing means being located peripherally, e.g. disposed at the corners or at the side of a touch sensing plate · CPC title