INPUT DETECTION DEVICE AND ELECTRONIC DEVICE

• US 20170357367A1
• Filed: 06/09/2017
• Published: 12/14/2017
• Est. Priority Date: 06/10/2016
• Status: Active Grant

• Current Assignee: Wacom Co Limited (Wacom)
• Original Assignee: Japan Display Incorporated
• Inventors: KATSUTA, Tadayoshi
• Granted Patent: US 10,474,284 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/133302 Rigid substrates, e.g. inorganic substrates
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• 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 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 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

An input detection device includes: a plurality of drive electrodes each of which includes a first end and a second end; a first scanner circuit and a second scanner circuit which select the first ends of the plurality of drive electrodes; a third scanner circuit and a fourth scanner circuit which select the second ends of the plurality of drive electrodes; and a controller which supplies a first drive voltage to the first end of a first drive electrode and to the second end of a second drive electrode and supplies a second drive voltage different from the first drive voltage to the second end of the first drive electrode and to the first end of the second drive electrode via the first scanner circuit, the second scanner circuit, the third scanner circuit, and the fourth scanner circuit.

Claims

1. An input detection device comprising:

a plurality of drive electrodes each of which includes a first end and a second end;

a first scanner circuit and a second scanner circuit that are configured to select the first ends of the plurality of drive electrodes;

a third scanner circuit and a fourth scanner circuit that are configured to select the second ends of the plurality of drive electrodes; and

a controller configured to supply a first drive voltage to the first end of a first drive electrode among the plurality of drive electrodes and to the second end of a second drive electrode among the plurality of drive electrodes, and supply a second drive voltage different from the first drive voltage to the second end of the first drive electrode and to the first end of the second drive electrode via the first scanner circuit, the second scanner circuit, the third scanner circuit, and the fourth scanner circuit.

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

a substrate on which the plurality of drive electrodes are arranged,

wherein the first scanner circuit and the second scanner circuit are arranged along a first side of a frame region of the substrate, and the third scanner circuit and the fourth scanner circuit are arranged along a second side of the frame region, the second side facing the first side.

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

a first selection drive circuit being arranged between the first end of each of the drive electrodes, and each of the first scanner circuit and the second scanner circuit; and

a second selection drive circuit being arranged between the second end of each of the drive electrodes, and each of the third scanner circuit and the fourth scanner circuit.

4. The input detection device according to claim 1,

wherein, when one of the first scanner circuit and the second scanner circuit selects supply of the first drive voltage to the first end of the first drive electrode,

the controller is configured to supply the first drive voltage to the first end of the first drive electrode via one of the first scanner circuit and the second scanner circuit,

wherein the controller is configured to supply the second drive voltage to the second end of the first drive electrode via one of the third scanner circuit and the fourth scanner circuit,

wherein the controller is configured to supply the second drive voltage to the first end of the second drive electrode via the other of the first scanner circuit and the second scanner circuit, and

wherein the controller is configured to supply the first drive voltage to the second end of the second drive electrode via the other of the third scanner circuit and the fourth scanner circuit.

5. The input detection device according to claim 1,

wherein the first drive electrode and the second drive electrode are simultaneously selected, and input detection by an electromagnetic induction method is performed by using a magnetic field generated by a current flowing through the first drive electrode and a magnetic field generated by a current flowing through the second drive electrode.

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

an indicator which includes a coil and a capacitive element.

7. The input detection device according to claim 3,

wherein the plurality of drive electrodes are arrayed in a predetermined direction, and at least one non-selected drive electrode is arranged between the first drive electrode and the second drive electrode which are selected simultaneously.

8. The input detection device according to claim 1,

wherein each of the first drive electrode and the second drive electrode includes a plurality of adjacent drive electrodes.

9. The input detection device according to claim 1,

wherein the first scanner circuit and the second scanner circuit are identical to each other, and

a timing to select a drive electrode in the first scanner circuit and a timing to select a drive electrode in the second scanner circuit are shifted from each other by m+n drive electrodes (m denotes a number of drive electrodes which are included in each of the first drive electrode and the second drive electrode, and n denotes a number of non-selected drive electrodes which are arranged between the first drive electrode and the second drive electrode).

10. The input detection device according to claim 9,

wherein the third scanner circuit and the fourth scanner circuit are identical to each other, and

a timing to select a drive electrode in the third scanner circuit and a timing to select a drive electrode in the fourth scanner circuit are also shifted from each other by the m+n drive electrodes.

11. The input detection device according to claim 1,

wherein the first scanner circuit and the fourth scanner circuit simultaneously select the first drive electrode, and the second scanner circuit and the third scanner circuit simultaneously select the second drive electrode.

12. The input detection device according to claim 1,

wherein the first scanner circuit and the third scanner circuit simultaneously select the first drive electrode, and the second scanner circuit and the fourth scanner circuit simultaneously select the second drive electrode.

13. The input detection device according to claim 9,

wherein the number denoted by the m and the number denoted by the n can be changed.

14. The input detection device according to claim 2,

wherein a unit scanner circuit which is included in the first scanner circuit and a unit scanner circuit which is included in the second scanner circuit are alternately arranged along the first side of the frame region of the substrate.

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

a gate driver,

wherein a unit scanner circuit which is included in the first scanner circuit, a unit scanner circuit which is included in the second scanner circuit, and a unit gate driver which is included in the gate driver are alternately arranged along the first side of the frame region of the substrate.

16. The input detection device according to claim 1,

wherein the plurality of drive electrodes are also used as drive electrodes which perform input detection by a capacitive sensing method.

17. The input detection device according to claim 1,

wherein, in an input detection period by an electromagnetic induction method, the controller is configured to supply the first drive voltage to the first end of the first drive electrode and to the second end of the second drive electrode, and supply the second drive voltage which is different from the first drive voltage to the second end of the first drive electrode and to the first end of the second drive electrode, and

wherein, in an input detection period by a capacitive sensing method, the controller is configured to supply a third drive voltage to the first end and the second end of the first drive electrode.

18. An electronic device comprising:

an input detection device according to claim 1.