Touch sensing device

• US 10,585,517 B2
• Filed: 06/11/2019
• Issued: 03/10/2020
• Est. Priority Date: 05/01/2012
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Abe, Hiroyuki, Maki, Masahiro, Suzuki, Takayuki
• Primary Examiner(s): Nguyen, Sang V
• Application Number:
  US16/437,036
• Publication Number:
  US 20190294285A1
• Time in Patent Office: 273 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/044 by capacitive means
• 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

The presence or absence of touch is detected according to a difference of a capacitance caused by the presence or absence of a material that blocks the electric field formed between the detection electrode and the common electrode. The common electrode includes a plurality of divided electrode portions that is extended in a lateral direction and aligned with each other in a longitudinal direction. Each of the plurality of common lines is electrically connected to at least one of the divided electrode portions. The plurality of common lines is arranged in an area next to the common electrode in the lateral direction of the common electrode, arranged next to each other in a width direction orthogonal to a length thereof, is different in width from each other, and the width of the common lines is wider as the length is longer.

Claims

1. A touch sensing device comprising:

a substrate including a sensing area and a peripheral area around the sensing area;

a plurality of touch sensing electrodes to which a touch signal is applied for touch detecting;

a plurality of wirings formed in the peripheral area so as to be electrically connected to the touch sensing electrodes, the wirings arranged in a lateral direction and each having an arranged portion;

an insulating layer formed between the wirings and the touch sensing electrodes, the insulating layer having a connecting opening formed above an end portion of each of the plurality of wirings; and

a conductive film formed in the connecting opening and electrically connecting each of the wirings and corresponding one of touch sensing electrodes,

wherein a width of the end portion is greater than a width of the arranged portion in a same one of the wirings, and

the conductive film is formed above the touch sensing electrode and the end portion.

2. The touch sensing device according to claim 1,

wherein each of the plurality of wirings has a longest wiring and a shortest wiring, and

the plurality of wirings each have the end portion displaced in the order from the longest wiring to the shortest wiring.

3. The touch sensing device according to claim 2,

wherein the shortest wiring is arranged at a side closest to the touch sensing electrode in the lateral direction,

wherein the longest wiring is arranged at a side farthest from the touch sensing electrode in the lateral direction, and

wherein the plurality of wirings each is more distant from the touch sensing electrode in the lateral direction as the wirings each is longer.

4. The touch sensing device according to claim 2,

wherein except for at least the shortest wiring, the respective wirings each have a plurality of portions different in width.

5. The touch sensing device according to claim 1,

wherein the substrate further includes a circuit, and

wherein the plurality of wirings is formed to overlap with the circuit.

6. A touch sensing device comprising:

a substrate including a sensing area and a peripheral area around the sensing area;

a plurality of touch sensing electrodes to which touch signal is applied for touch detecting;

a plurality of wirings formed in the peripheral area so as to be electrically connected to the touch sensing electrode, the wirings arranged in a lateral direction and each having a parallel arranged portion;

an insulation layer formed between the wirings and the touch sensing electrodes, the insulation layer having a connecting opening formed above an end portion of each of the plurality of wirings; and

a conductive film formed in the connecting opening and electrically connecting each of the wirings and corresponding one of the plurality of touch sensing electrodes,

wherein a width of the end portion is greater than a width of the parallel arranged portion in same one of the wirings,

the width in the lateral direction of the parallel arranged portion of longer one of the wirings is greater than the width of shorter one of the wirings, and

the conductive film is formed above the touch sensing electrode and the end portion.

7. The touch sensing device according to claim 6,

wherein each of the plurality of common lines has a longest wiring to a shortest wiring, and

the plurality of wirings each have the end portion displaced in the order from the longest wiring to the shortest wiring.

8. The touch sensing device according to claim 7,

wherein the shortest wiring is arranged at a side closest to the touch sensing electrode in the lateral direction,

wherein the longest wiring is arranged at a side farthest from the touch sensing electrode in the lateral direction, and

wherein the plurality of wirings is more distant from the touch sensing electrode in the lateral direction as the wirings is longer.

9. The touch sensing device according to claim 6,

wherein except for at least the shortest wiring, the wirings each have a plurality of portions different in width.

10. The touch sensing device according to claim 6,

wherein the substrate further includes a circuit, and

wherein the plurality of wirings is formed to overlap with the circuit.