DISPLAY DEVICE, INPUT DETECTION DEVICE AND ELECTRONIC APPARATUS

• US 20180059461A1
• Filed: 08/25/2017
• Published: 03/01/2018
• Est. Priority Date: 08/26/2016
• Status: Active Grant

• Current Assignee: Wacom Co Limited (Wacom)
• Original Assignee: Japan Display Incorporated
• Inventors: KATSUTA, Tadayoshi, MIZUHASHI, Hiroshi
• Granted Patent: US 10,268,061 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/1343 Electrodes reflective electrodes G02F1/133553
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• 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 3/04166 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 3/0445 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 3/046 by electromagnetic means

Abstract

In, for example, such an in-cell touch panel of an electromagnetic induction method as to generate a magnetic field for touch detection in a display device, provided is an input detection device in which even an end portion of a display area can generate the same magnetic field as that generated at a center of the display area. The input detection device includes a plurality of first drive electrodes placed in a detection area; a second drive electrode placed in a frame area; and a second drive circuit driving the second drive electrode. In addition, the plurality of first drive electrodes and the second drive electrode extend in a first direction to be arranged in a second direction crossing the first direction, and the second drive electrode and the second drive circuit are arranged in the first direction in the frame area.

Claims

1. A display device comprising:

a plurality of pixel electrodes arranged in a display area;

a plurality of first drive electrodes arranged in the display area;

a second drive electrode arranged in a frame area; and

a second drive circuit arranged in the frame area and coupled to the second drive electrode,

wherein the first drive electrodes and the second drive electrode extend in a first direction and are arranged in a second direction crossing the first direction, and

the second drive circuit provides a magnetic field drive signal to the second drive electrode.

2. The display device according to claim 1,

wherein the second drive electrode and at least one of the first drive electrodes are simultaneously driven to generate a magnetic field.

3. The display device according to claim 1, further comprising a plurality of first drive circuits electrically coupled to the first electrodes respectively,

wherein the second drive circuit and at least one of the first drive circuits simultaneously provide the magnetic field drive signal to the second drive electrode and at least one of the first drive electrodes.

4. The display device according to claim 1, further comprising a first wiring and a second wiring,

wherein the second drive circuit provides a first voltage to one end of the second drive electrode via the first wiring, and provides a second voltage to another end of the second drive electrode via the second wiring in a first timing,

the second voltages is higher than the first voltage.

5. The display device according to claim 4, further comprising a plurality of first drive circuits electrically coupled to the first electrodes respectively,

wherein at least one of the first drive circuits provides a first voltage to another end of at least one of the first drive electrodes via the first wiring, and provides a second voltage to one end of at least one of the first drive electrodes via the second wiring in the first timing.

6. The display device according to claim 4, further comprising a plurality of first drive circuits electrically coupled to the first electrodes respectively,

wherein the first drive circuit provides a first voltage to one end of at least one of the first drive electrodes via the first wiring, and provides a second voltage to another end of at least one of the first electrodes via the second wiring in the first timing.

7. The display device according to claim 1, further comprising a plurality of first drive circuits electrically coupled to the first electrodes respectively,

wherein at least one of the first drive circuits provides a display drive signal to at least one of the first drive electrodes.

8. The display device according to claim 1, further comprising a plurality of first drive circuits electrically coupled to the first electrodes respectively,

wherein at least one of the first drive circuits provides an electric field drive signal to at least one of the first drive electrodes.

9. An input detection device comprising:

a plurality of first drive electrodes arranged in a detection area;

a second drive electrode placed in a frame area; and

a second drive circuit driving the second drive electrode,

wherein the plurality of first drive electrodes and the second drive electrode extend in a first direction and are arranged in a second direction crossing the first direction, and

wherein the second drive electrode and the second drive circuit are arranged in the first direction in the frame area.

10. The input detection device according to claim 9,

wherein the second drive electrode and at least one of the first drive electrodes are simultaneously driven to generate a magnetic field.

11. The input detection device according to claim 9,

wherein the second drive circuit includes:

a second switch connecting the second drive electrode and a signal wiring for supplying a drive voltage to the second drive electrode; and

a second selection circuit selecting the second drive electrode by switching the second switch.

12. The input detection device according to claim 9,

wherein the second drive electrode is shorter than each of the first drive electrodes in the first direction.

13. The input detection device according to claim 9,

wherein the second drive electrode is shorter than each of the first drive electrodes in the second direction.

14. The input detection device according to claim 9, further comprising a first drive circuit driving the first drive electrodes,

wherein the first drive circuit includes:

a first switch connecting the first drive electrodes and a signal wiring for supplying the drive voltage to the first drive electrodes; and

a first selection circuit selecting the first drive electrodes by switching the first switch, and

wherein the first drive circuit and the second drive circuit simultaneously drive the first drive electrodes and the second drive electrode to generate magnetic fields.

15. The input detection device according to claim 9, further comprising a signal wiring extending in the first direction in the frame area,

wherein a total amount of currents flowing through the signal wiring and the second drive electrode is equal to an amount of currents flowing through the first drive electrodes when the magnetic fields are generated.

16. The input detection device according to claim 9,

wherein a plurality of the second drive electrodes are arranged on one side of the frame area.

17. The input detection device according to claim 9,

wherein the plurality of first drive electrodes function also as detection electrodes.

18. The input detection device according to claim 9,

wherein the second drive electrode is formed of a metallic material.

19. An electronic apparatus comprising the input detection device according to claim 9.