Detection device including conductive thin wires

• US 10,579,199 B2
• Filed: 07/03/2019
• Issued: 03/03/2020
• Est. Priority Date: 11/25/2015
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Ishizaki, Koji, Teramoto, Masahiro, Sato, Yuji
• Primary Examiner(s): Polo, Gustavo
• Application Number:
  US16/502,871
• Publication Number:
  US 20190324578A1
• Time in Patent Office: 244 Days
• Field of Search: None
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04112 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 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• 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

According to an aspect, a detection device includes: a substrate; a detection electrode disposed on a plane parallel to a surface of the substrate and including conductive thin wires and electrical coupling portions disposed where the conductive thin wires intersect with each other or are bent, and are coupled with each other, the conductive thin wires being arranged in a mesh-like form; a coupling wire that couples the conductive thin wires with a detecting unit at an end portion of the detection electrode; and a protective layer that is made of an insulation material and that covers the detection electrode and the coupling wire. An area density of the conductive thin wires per unit area is smaller in an end region ranging from an electrical coupling portion closest to the coupling wire to the coupling wire than in a region of the entire detection electrode.

Claims

1. A display device, comprising:

a substrate;

a detection electrode including;

a first electrode portion including;

a first thin wire extending at a first angle with respect to a first direction;

a second thin wire extending at a second angle different from the first angle with respect to the first direction; and

a first bent portion coupling the first thin wire and the second thin wire;

a second electrode portion adjacent to the first electrode portion in the first direction including;

a third thin wire extending at a third angle with respect to the first direction;

a fourth thin wire extending at a fourth angle different from the third angle with respect to the first direction; and

a second bent portion coupling the third thin wire and the fourth thin wire; and

a coupling portion including;

a fifth thin wire extending in the first direction and separated from the first bent portion and the second bent portion in a second direction crossing the first direction;

a sixth thin wire coupling the fifth thin wire and the first bent portion; and

a seventh thin wire coupling the fifth thin wire and the second bent portion;

a coupling wire coupled to the fifth thin wire of the coupling portion;

a protective layer covering the detection electrode; and

a pixel including a pixel electrode arranged between the substrate and the detection electrode.

2. The display device according to claim 1,

wherein the second thin wire, the third thin wire, the fifth thin wire, the sixth thin wire, and the seventh thin wire substantially form a pentagon.

3. The display device according to claim 1,

wherein the first angle is substantially equal to the third angle.

4. The display device according to claim 1,

wherein the first thin wire is in parallel to the third thin wire.

5. The display device according to claim 1,

wherein the first electrode portion further includes:

an eighth thin wire extending at an eighth angle with respect to the first direction and coupled to the first thin wire, and

a ninth thin wire extending at a ninth angle different from the eighth angle with respect to the first direction and coupled to the second thin wire and the eighth thin wire.

6. The display device according to claim 5,

wherein the first thin wire, the second thin wire, the eighth thin wire, and the ninth thin wire substantially form a quadrangle.

7. The display device according to claim 5,

wherein the second angle is substantially equal to the eighth angle.

8. The display device according to claim 5,

wherein the second thin wire is in parallel to the eighth thin wire.

9. The display device according to claim 1,

wherein an angle between the fifth thin wire and the seventh thin wire is greater than an angle between the third thin wire and the fourth thin wire.

10. The display device according to claim 9,

wherein an angle between the fifth thin wire and the sixth thin wire is greater than an angle between the first thin wire and the second thin wire.

11. The display device according to claim 1, further comprising a detector coupled to the detection electrode via the coupling wire and configured to receive a detection signal from the detection electrode.

12. The display device according to claim 1, wherein a length between an outer edge of the substrate and the first electrode portion in the second direction is longer than a length between the outer edge of the substrate and the coupling portion in the second direction.

13. A detection device, comprising:

a substrate;

a detection electrode including;

a first electrode portion including;

a first thin wire extending at a first angle with respect to a first direction;

a second thin wire extending at a second angle different from the first angle with respect to the first direction; and

a first bent portion coupling the first thin wire and the second thin wire;

a second electrode portion adjacent to the first electrode portion in the first direction including;

a third thin wire extending at a third angle with respect to the first direction;

a fourth thin wire extending at a fourth angle different from the third angle with respect to the first direction; and

a second bent portion coupling the third thin wire and the fourth thin wire; and

a coupling portion including;

a fifth thin wire extending in the first direction and separated from the first bent portion and the second bent portion in a second direction crossing the first direction;

a sixth thin wire coupling the fifth thin wire and the first bent portion; and

a seventh thin wire coupling the fifth thin wire and the second bent portion;

a coupling wire coupled to the fifth thin wire of the coupling portion;

a protective layer covering the detection electrode; and

a detector coupled to the detection electrode via the coupling wire and configured to receive a detection signal from the detection electrode.

14. A display device, comprising:

the detection device according to claim 13; and

a pixel including a pixel electrode arranged between the substrate and the detection electrode.

15. A detection device, comprising:

a substrate;

a detection electrode including;

a first electrode portion including;

a first thin wire extending at a first angle with respect to a first direction;

a second thin wire extending at a second angle different from the first angle with respect to the first direction; and

a first bent portion coupling the first thin wire and the second thin wire;

a second electrode portion adjacent to the first electrode portion in the first direction including;

a third thin wire extending at a third angle with respect to the first direction;

a fourth thin wire extending at a fourth angle different from the third angle with respect to the first direction; and

a second bent portion coupling the third thin wire and the fourth thin wire; and

a coupling portion including;

a fifth thin wire extending in the first direction and separated from the first bent portion and the second bent portion in a second direction crossing the first direction;

a sixth thin wire coupling the fifth thin wire and the first bent portion; and

a seventh thin wire coupling the fifth thin wire and the second bent portion;

a coupling wire coupled to the fifth thin wire of the coupling portion; and

a protective layer covering the detection electrode,

wherein a length between an outer edge of the substrate and the first electrode portion in the second direction is longer than a length between the outer edge of the substrate and the coupling portion in the second direction.

16. A display device, comprising:

the detection device according to claim 15; and

a pixel including a pixel electrode arranged between the substrate and the detection electrode.