Detection device and display device

• US 10,705,637 B2
• Filed: 09/24/2018
• Issued: 07/07/2020
• Est. Priority Date: 09/29/2017
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Nakanishi, Takayuki, Takada, Naoki
• Primary Examiner(s): Rosario, Nelson M
• Application Number:
  US16/139,582
• Publication Number:
  US 20190102019A1
• Time in Patent Office: 652 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• 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 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/041662 using alternate mutual and self-capacitive scanning
• 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: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality

Abstract

According to an aspect, a detection device includes: at least one substrate; a plurality of first electrodes extending in a first direction of the substrate and arrayed in a second direction intersecting the first direction; and a plurality of second electrodes arrayed in at least the first direction in a layer different from a layer of the first electrodes. Each of the second electrodes partially overlaps with the first electrodes in planar view and has an electric-field transmission region, in which an electric field can pass through each of the second electrodes in a direction perpendicular to the substrate. The electric-field transmission region in each of the second electrodes overlaps with one of the first electrodes in planar view.

Claims

1. A detection device comprising:

at least one substrate;

a plurality of first electrodes extending in a first direction of the substrate and arrayed in a second direction intersecting the first direction; and

a plurality of second electrodes arrayed in at least the first direction in a layer different from a layer of the first electrodes, wherein

each of the second electrodes partially overlaps with the first electrodes in planar view and has an electric-field transmission region, in which an electric field can pass through each of the second electrodes in a direction perpendicular to the substrate,

the electric-field transmission region in each of the second electrodes overlaps with one of the first electrodes in planar view,

each of the second electrodes includes a plurality of the electric-field transmission regions,

the electric-field transmission regions are disposed in a row-column configuration,

the first electrodes are partially bent,

the first electrodes each have a wide portion that has a width in the second direction larger than a width of remaining portions, and

the wide portion of one of the first electrodes and the wide portion of another one of the first electrodes adjacent to the one of the first electrodes are disposed side by side in the first direction.

2. The detection device according to claim 1, further comprising:

a drive circuit configured to supply a first drive signal to the first electrodes and supply a second drive signal to the second electrodes; and

a control circuit having a first detection mode of detecting a target object in contact with a detection surface in accordance with a first detection signal corresponding to a change in mutual capacitance between the first electrodes and the second electrodes when the first drive signal is supplied to the first electrodes, and a second detection mode of detecting the target object in a non-contact state with respect to the detection surface in accordance with a second detection signal corresponding to a change in self-capacitance in the second electrodes when the second drive signal is supplied to the second electrodes.

3. The detection device according to claim 2, further comprising a detection circuit, wherein

the detection circuit identifies, in the first detection mode, one of the first electrodes supplied with the first drive signal and detects the target object in contact with the detection surface, in accordance with the first detection signal corresponding to a change in mutual capacitance between the one of the first electrodes and one of the second electrodes overlapping with the one of the first electrodes, in the electric-field transmission region of the one of the second electrodes.

4. The detection device according to claim 1, wherein the second electrodes each include a plurality of metal wires having a mesh, zigzag-line, or wavy-line shape.

5. A detection device comprising:

at least one substrate;

a plurality of first electrodes extending in a first direction of the substrate and arrayed in a second direction intersecting the first direction; and

a plurality of second electrodes arrayed in at least the first direction in a layer different from a layer of the first electrodes, wherein

each of the second electrodes partially overlaps with the first electrodes in planar view and has an electric-field transmission region, in which an electric field can pass through each of the second electrodes in a direction perpendicular to the substrate,

the electric-field transmission region in each of the second electrodes overlaps with one of the first electrodes in planar view,

each of the second electrodes includes a plurality of the electric-field transmission regions,

the electric-field transmission regions are disposed in a row-column configuration,

the first electrodes include a plurality of linear wires extending in the first direction and a plurality of electrode pieces electrically coupled to the linear wires,

each of the electrode pieces is wider than each of the linear wires, and

each of the electrode pieces overlaps with one of the electric-field transmission regions.

6. A detection device comprising:

at least one substrate;

a plurality of first electrodes extending in a first direction of the substrate and arrayed in a second direction intersecting the first direction;

a plurality of second electrodes arrayed in at least the first direction in a layer different from a layer of the first electrodes;

wherein each of the second electrodes partially overlaps with the first electrodes in planar view and has an electric-field transmission region, in which an electric field can pass through each of the second electrodes in a direction perpendicular to the substrate, and

wherein the electric-field transmission region in each of the second electrodes overlaps with one of the first electrodes in planar view;

a drive circuit configured to supply a first drive signal to the first electrodes and supply a second drive signal to the second electrodes; and

a control circuit having a first detection mode of detecting a target object in contact with a detection surface in accordance with a first detection signal corresponding to a change in mutual capacitance between the first electrodes and the second electrodes when the first drive signal is supplied to the first electrodes, and a second detection mode of detecting the target object in a non-contact state with respect to the detection surface in accordance with a second detection signal corresponding to a change in self-capacitance in the second electrodes when the second drive signal is supplied to the second electrodes,

wherein the drive circuit supplies a signal synchronized with the second drive signal and having an electric potential identical to an electric potential of the second drive signal to the first electrodes in the second detection mode.

7. The detection device according to claim 6, wherein the second electrodes each have a substantially rectangular, square, polygonal, or elliptic shape.