Detection device, display device, and electronic apparatus

• US 10,429,981 B2
• Filed: 11/21/2016
• Issued: 10/01/2019
• Est. Priority Date: 03/09/2016
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Noguchi, Koji, Katsuta, Tadayoshi, Teranishi, Yasuyuki
• Primary Examiner(s): Nguyen, Chanh D
• Assistant Examiner(s): Truong, Nguyen H
• Application Number:
  US15/357,666
• Publication Number:
  US 20170262112A1
• Time in Patent Office: 1,044 Days
• CPC Class Codes: G02F 1/133305 Flexible substrates, e.g. plastics, organic film
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133314 Back frames
• CPC Class Codes: G02F 1/133331 Cover glasses
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G06F 2203/04101 2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
• CPC Class Codes: G06F 2203/04102 Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
• 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 2203/04108 Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• 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 3/0414 : using force sensing means to determine a position
• CPC Class Codes: G06F 3/0416 : Control or interface arrangements specially adapted for digitisers
• 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 3/044 : 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
• CPC Class Codes: G06F 3/0447 : Position sensing using the local deformation of sensor cells

Abstract

A detection device includes a substrate, first electrodes, second electrodes, and a conductor. The substrate has a first surface and a second surface opposite to the first surface. The first electrodes are provided in a display area of the substrate and detect the position of an object being in contact with or in proximity to the first surface side of the substrate or pressure of the object being in contact with the first surface side. The second electrodes are provided along at least one side of the outer periphery of the display area. The conductor is provided on the second surface side of the substrate apart from the substrate and generates an electrostatic capacitor between the conductor and the second electrodes.

Claims

1. A detection device comprising:

a substrate having a first surface and a second surface opposite to the first surface;

first electrodes that are provided in a display area of the substrate and that are configured to detect a position of an object being in contact with or in proximity to a first surface side of the substrate or pressure of the object being in contact with the first surface side in a touch detection period;

a plurality of second electrodes provided along at least one side of an outer periphery of the display area and configured to detect contact of an object in a pressure detection period;

a conductor that is provided on a second surface side of the substrate apart from the substrate, an electrostatic capacitor being generated between the conductor and the second electrodes;

a third electrode facing the first electrodes,

wherein

the first and third electrodes do not detect the position in the pressure detection period,

the position of the object being in contact with or in proximity to the first surface side is detected in the touch detection period, based on an electrostatic capacitor between the first electrodes and the third electrode,

a drive signal is supplied to the second electrodes in the pressure detection period, and

the third electrode is disposed in a layer different from a layer of the second electrodes, overlaps with the second electrodes in a vertical direction perpendicular to a main surface of the substrate, and is supplied with a guard signal which has a waveform synchronized with the drive signal in the pressure detection period.

2. The detection device according to claim 1, wherein

the first electrodes extend in a first direction, and

the second electrodes are arrayed in a direction along the first direction.

3. The detection device according to claim 1, wherein the second electrodes are arrayed in a direction along a first direction and in a second direction intersecting with the first direction and provided along at least two sides of the display area.

4. The detection device according to claim 1, wherein the second electrodes detect magnitude of the pressure or one-dimensional coordinates of the pressure when the object is in contact with the first surface side of the substrate.

5. The detection device according to claim 1, wherein

the first electrodes extend in a first direction and are arrayed in a second direction intersecting the first direction, and

the detection device calculates two-dimensional coordinates of the pressure when the object is in contact with the first surface side of the substrate based on a detection result of the first electrodes and the second electrodes.

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

a frame wire provided in a frame area positioned on an outer side of the display area and coupled to the third electrode, wherein

the third electrode has a first portion provided at a center of the display area and a second portion provided between the first portion and the frame wire along the outer periphery of the display area, and

the second electrodes are arranged between the second portion and the conductor in the vertical direction.

7. The detection device according to claim 6, further comprising a shielding layer facing the second electrodes, wherein

the second electrodes are disposed between the shielding layer and the conductor in the vertical direction, and

the shielding layer is the second portion of the third electrode.

8. The detection device according to claim 6, wherein the second portion has an area that is electrically separated from the first portion and that does not detect the object being in contact with or in proximity to the first surface side.

9. The detection device according to claim 1, further comprising a shielding layer facing the second electrodes and provided on a side opposite to the conductor with respect to the second electrodes.

10. The detection device according to claim 9, wherein the shielding layer is supplied with a signal having a waveform synchronized with the drive signal supplied to the second electrodes.

11. A display device comprising:

the detection device according to claim 1;

a plurality of pixel electrodes facing the first electrodes and arranged in a matrix; and

a display function layer that performs an image display function in the display area.

12. The display device according to claim 11, wherein the second electrodes are provided at the same layer as a layer of the pixel electrodes.

13. The display device according to claim 11, wherein the second electrodes are provided at a layer closer to the second surface than a layer of the pixel electrodes.

14. The display device according to claim 11, wherein the second electrodes are provided at a position superimposed on the first electrodes and coupled to a pixel signal line that supplies a pixel signal to the pixel electrodes.

15. The display device according to claim 11, wherein

a display operation is performed in a display period to supply the pixel signal to the pixel electrodes and to cause the display function layer to perform the image display function,

a touch detection operation is performed in the touch detection period to detect the object being in contact with or in proximity to the first surface side, and

a pressure detection operation is performed in the pressure detection period to detect the pressure applied to the substrate based on electrostatic capacitance change between the second electrodes and the conductor, and

the display operation, the touch detection operation, and the pressure detection operation are performed in a time division manner.

16. The display device according to claim 11, wherein the first electrodes are common electrodes.

17. An electronic apparatus comprising:

the display device according to claim 11; and

a housing that accommodates the display device, wherein

the housing includes the conductor.

18. An electronic apparatus comprising:

the detection device according to claim 1; and

a housing that accommodates the detection device, wherein

the housing includes the conductor.

19. The detection device according to claim 1, wherein the contact is detected based on the electrostatic capacitor between the conductor and the second electrodes.

20. The detection device according to claim 1, wherein

the third electrode is disposed in the layer different from the layer of the second electrodes, overlaps the second electrodes in the vertical direction, and is supplied with:

in the pressure detection period, the guard signal which has the waveform synchronized with the drive signal; and

in the touch detection period, a voltage having a fixed potential.