Input device and input/output device

• US 9,933,903 B2
• Filed: 09/29/2015
• Issued: 04/03/2018
• Est. Priority Date: 10/02/2014
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Miyake, Hiroyuki
• Primary Examiner(s): Eurice, Michael J
• Application Number:
  US14/868,792
• Publication Number:
  US 20160098120A1
• Time in Patent Office: 917 Days
• CPC Class Codes: B60K 2360/143 Touch sensitive instrument input devices
• CPC Class Codes: B60K 2360/774 on or in the centre console
• CPC Class Codes: B60K 2360/794 on or in doors
• CPC Class Codes: B60K 35/00 Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
• CPC Class Codes: B60K 35/10 Input arrangements, i.e. from user to vehicle, associated with vehicle functions or specially adapted therefor
• CPC Class Codes: B60K 35/60 Instruments characterised by their location or relative disposition in or on vehicles arrangements of lighting devices on dashboards B60Q3/10
• CPC Class Codes: G01R 27/2605 Measuring capacitance capacitive sensors G01D5/24
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 1/1626 with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
• CPC Class Codes: G06F 1/163 Wearable computers, e.g. on a belt
• CPC Class Codes: G06F 1/1641 the display being formed by a plurality of foldable display components G06F1/1647 takes precedence
• CPC Class Codes: G06F 1/1652 the display being flexible, e.g. mimicking a sheet of paper, or rollable
• 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 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• 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 3/03547 Touch pads, in which fingers can move on a surface
• 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 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: H03K 17/955 : using a capacitive detector

Abstract

An input device or an input/output device that is suitable for increasing in size is provided. An input device or an input/output device that can be driven at high frequencies is provided. An input device includes a plurality of row wirings and a plurality of column wirings. To each of the plurality of row wirings, periodic rectangular waves are applied. When attention is paid to one row wiring Xi (i is greater than or equal to 1 and less than or equal to m−1), a signal that has a phase opposite to that of a signal applied to the row wiring Xi and that is delayed for a given period is applied to a row wiring Xi+1, which is the row wiring next to the row wiring Xi. The width of each of the rectangular waves applied to the row wirings corresponds to a frame period.

Claims

1. An input device comprising:

m row wirings (m is an integer of 2 or more);

n column wirings (n is an integer of 2 or more);

a plurality of capacitors; and

a circuit,

wherein;

each of the plurality of capacitors is between one of the m row wirings and one of then column wirings,

the circuit is configured to sense a potential of each of the n column wirings or a current flowing to each of the n column wirings,

the circuit is configured to input an i-th signal (i is an integer greater than or equal to 1 and less than or equal to m−

1) to an i-th row wiring, and to input an i+1-th signal to an i+1-th row wiring,

the i-th signal changes from a first potential into a second potential at a first time, and from the second potential into the first potential at a second time,

the i-th signal includes a first period in which the first time and the second time are alternately and regularly repeated,

the i+1-th signal changes from a third potential into a fourth potential at a third time, and from the fourth potential into the third potential at a fourth time,

the i+1-th signal includes a second period in which the third time and the fourth time are alternately and regularly repeated,

each of the first potential and the fourth potential is a low level potential,

each of the second potential and the third potential is a high level potential, and

the third time is placed between the first time and the second time.

2. The input device according to claim 1, wherein a period from the first time to the second time has the same length as a period from the third time to the fourth time.

3. The input device according to claim 1, wherein a period from the first time to the second time corresponds to a frame period.

4. The input device according to claim 1, wherein:

the first potential is equal to the fourth potential, and

the second potential is equal to the third potential.

5. The input device according to claim 1, wherein:

the first potential is equal to the third potential, and

the second potential is equal to the fourth potential.

6. The input device according to claim 1, wherein m is an odd number of 3 or more.

7. The input device according to claim 1, wherein the m row wirings and the n column wirings contain a light-transmitting conductive material.

8. The input device according to claim 1, wherein them row wirings and the n column wirings contain a light-blocking conductive material and have a region whose width is greater than or equal to 50 nm and less than or equal to 100 μ

m.

9. The input device according to claim 1, wherein:

in a period from the first time to the third time, the i-th signal and the i+1-th are respectively in a state of the high level potential, and

in a period from the second time to the fourth time, the i-th signal and the i+1-th are respectively in a state of the low level potential.

10. The input device according to claim 1, wherein in a period from the third time to the second time, the i-th signal and the i+1-th signal are in states of level potentials opposite to each other.

11. An input/output device comprising:

the input device according to claim 1; and

a display panel,

wherein the display panel includes a display element and a transistor.

12. A method for driving an input device,

the input device comprising:

m row wirings (m is an integer of 2 or more);

n column wirings (n is an integer of 2 or more);

a plurality of capacitors; and

a circuit,

the method comprising;

inputting an i-th signal (i is an integer greater than or equal to 1 and less than or equal to m−

1) to an i-th row wiring, and an i+1-th signal to an i+1-th row wiring; and

sensing a potential of each of the n column wirings or a current flowing to each of then column wirings,

wherein;

each of the plurality of capacitors is between one of them row wirings and one of the n column wirings,

the i-th signal changes from a first potential into a second potential at a first time, and from the second potential into the first potential at a second time,

the i-th signal includes a first period in which the first time and the second time are alternately and regularly repeated,

the i+1-th signal changes from a third potential into a fourth potential at a third time, and from the fourth potential into the third potential at a fourth time,

the i+1-th signal includes a second period in which the third time and the fourth time are alternately and regularly repeated,

each of the first potential and the fourth potential is a low level potential,

each of the second potential and the third potential is a high level potential, and

the third time is placed between the first time and the second time.

13. The method according to claim 12, wherein a period from the first time to the second time has the same length as a period from the third time to the fourth time.

14. The method according to claim 12, wherein a period from the first time to the second time corresponds to a frame period.

15. The method according to claim 12, wherein:

the first potential is equal to the fourth potential, and

the second potential is equal to the third potential.

16. The method according to claim 12, wherein:

the first potential is equal to the third potential, and

the second potential is equal to the fourth potential.

17. The method according to claim 12, wherein m is an odd number of 3 or more.

18. The method according to claim 12, wherein:

in a period from the first time to the third time, the i-th signal and the i+1-th are respectively in a state of the high level potential, and

in a period from the second time to the fourth time, the i-th signal and the i+1-th are respectively in a state of the low level potential.

19. The method according to claim 12, wherein in a period from the third time to the second time, the i-th signal and the i+1-th signal are in states of level potentials opposite to each other.