# US 2021/0342033 A1 · Touch detection device, touch detection method for display device, and display system

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- Number: US 2021/0342033 A1
- Document ID: US20210342033A1
- Status: Published application
- Kind: A1
- Application number: 17/375,636
- Filed: 2021-07-14
- Published: 2021-11-04
- Earliest claimed: 2019-03-14
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Takashi HATANO
- Web page: https://patentgrep.com/patent/US20210342033A1

## CPC

- G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer}
- G02F 1/13338: {Input devices, e.g. touch panels}
- G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)}
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/0416: {Control or interface arrangements specially adapted for digitisers}
- G06F 3/04164: {Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads}
- 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)}
- G06F 3/0443: {using a single layer of sensing electrodes}
- G09F 9/30: in which the desired character or characters are formed by combining individual elements (panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00)
- G02F 2201/121: common or background
- G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS

## Abstract

A detection value acquirer acquires a plurality of detection values that are based on capacitance of each of a plurality of common electrodes arranged in a matrix. A detection value calculator calculates detection values in a plurality of block regions each containing two or more common electrodes out of the plurality of common electrodes based on the plurality of detection values. A touch detector detects a touch by a conductor on the display screen of a display device based on the detection value of each of the plurality of block regions. The detection value calculator calculates the detection value of each of the plurality of block regions in the display screen based on the detection value of each of the two or more common electrodes included in each of the plurality of block regions.

## Claims

### Claim 1

A touch detection device of a display device including a plurality of common electrodes arranged in a matrix and used for image display and touch detection, comprising:
a detection value acquirer that acquires a plurality of detection values that are based on capacitance of each of the plurality of common electrodes;
a detection value calculator that calculates detection values in a plurality of block regions each containing two or more common electrodes out of the plurality of common electrodes based on the plurality of detection values acquired by the detection value acquirer; and
a touch detector that detects a touch by a conductor on a display screen of the display device based on the detection value of each of the plurality of block regions calculated by the detection value calculator, wherein
the plurality of block regions include at least a first block region and a second block region,
the first block region includes at least a first common electrode out of the plurality of common electrodes and a second common electrode adjacent to the first common electrode out of the plurality of common electrodes,
the second block region includes at least the second common electrode and a third common electrode adjacent to the second common electrode out of the plurality of common electrodes and different from the first common electrode, and
the detection value calculator calculates the detection value of each of the plurality of block regions in the display screen based on the detection value of each of the two or more common electrodes included in each of the plurality of block regions.

### Claim 2 (depends on 1)

The touch detection device according to claim 1, wherein
each of the plurality of block regions includes at least one common electrode shared with other block regions.

### Claim 3 (depends on 1)

The touch detection device according to claim 1, wherein
the detection value calculator acquires a difference value with respect to a reference capacitance of the common electrodes as the detection value and sums up the respective detection values of the two or more common electrodes included in the plurality of block regions so as to calculate the detection values of the block regions.

### Claim 4 (depends on 1)

The touch detection device according to claim 1, wherein
the detection value calculator acquires a difference value with respect to a reference capacitance of the common electrodes as the detection value, converts detection values of the two or more common electrodes included in the block region that are equal to zero or below to one, and then multiplies the plurality of detection values after the conversion by one another so as to calculate the detection value of the block region.

### Claim 5 (depends on 1)

The touch detection device according to claim 1, wherein
the detection value calculator converts detection values of the plurality of block regions that are negative values to zero and amplifies detection values of the plurality of block regions that are positive values.

### Claim 6 (depends on 1)

The touch detection device according to claim 1, wherein
the plurality of block regions are rectangular regions each including a plurality of common electrodes.

### Claim 7 (depends on 1)

The touch detection device according to claim 1, wherein
the plurality of block regions are cross-shaped regions each including a plurality of common electrodes.

### Claim 8 (depends on 1)

The touch detection device according to claim 1, wherein
when the detection value of a certain block region is equal to or greater than a touch detection threshold value and is equal to or greater than a threshold value for release determination, the touch detector generates a plurality of block regions whose size is smaller than that of the block region and calculates detection values of the plurality of block regions in a region including at least a plurality of common electrodes included in the block region.

### Claim 9 (depends on 1)

The touch detection device according to claim 1, further comprising
a drive circuit that supplies a touch drive signal or a reference voltage for image display to each of the plurality of common electrodes; and
a control circuit that controls the drive circuit and a touch detection circuit including the touch detector and alternately repeats partial touch detection on one of a plurality of detection region configured by dividing the plurality of common electrodes within the screen into a plurality of groups, and partial image display on one of a plurality of display regions configured by dividing a plurality of pixels within the screen into a plurality of groups, so as to control the touch detection and the image display in a time division manner, wherein
the touch detector detects a touch for each detection region.

### Claim 10 (depends on 1)

The touch detection device according to claim 1, further comprising:
a drive circuit that supplies a touch drive signal or a reference voltage for image display to each of the plurality of common electrodes; and
a control circuit that controls the drive circuit and a touch detection circuit including the touch detector and alternately repeats partial touch detection on one of a plurality of detection region configured by dividing the plurality of common electrodes within the screen into a plurality of groups, and partial image display on one of a plurality of display regions configured by dividing a plurality of pixels within the screen into a plurality of groups, so as to control the touch detection and the image display in a time division manner, wherein
the touch detector detects a touch for the screen.

### Claim 11 (depends on 1)

The touch detection device according to claim 1, wherein
the detection value calculator outputs the detection value of each of the plurality of block regions within the display screen in association with the center coordinates of each of the plurality of block regions.

### Claim 12 (depends on 1)

The touch detection device according to claim 1, wherein
the touch detector outputs touch position data on the display screen based on a detected touch position.

### Claim 13

A touch detection method of a display device including a plurality of common electrodes arranged in a matrix and used for image display and touch detection, comprising:
acquiring a plurality of detection values that are based on capacitance of each of the plurality of common electrodes;
calculating detection values in a plurality of block regions each containing two or more common electrodes out of the plurality of common electrodes based on the plurality of acquired detection values; and
detecting a touch by a conductor on a display screen of the display device based on the calculated detection value of each of the plurality of block regions, wherein
the plurality of block regions include at least a first block region and a second block region,
the first block region includes at least a first common electrode out of the plurality of common electrodes and a second common electrode adjacent to the first common electrode out of the plurality of common electrodes,
the second block region includes at least the second common electrode and a third common electrode adjacent to the second common electrode out of the plurality of common electrodes and different from the first common electrode, and
in the calculating, the detection value of each of the plurality of block regions in the display screen is calculated based on the detection value of each of the two or more common electrodes included in each of the plurality of block regions.

### Claim 14

A display system comprising:
a display unit including a plurality of common electrodes arranged in a matrix and used for image display and touch detection;
a detection value acquirer that acquires a plurality of detection values that are based on capacitance of each of the plurality of common electrodes;
a detection value calculator that calculates detection values in a plurality of block regions each containing two or more common electrodes out of the plurality of common electrodes based on the plurality of detection values acquired by the detection value acquirer; and
a touch detector that detects a touch by a conductor on a display screen of the display unit based on the detection value of each of the plurality of block regions calculated by the detection value calculator, wherein
the plurality of block regions include at least a first block region and a second block region,
the first block region includes at least a first common electrode out of the plurality of common electrodes and a second common electrode adjacent to the first common electrode out of the plurality of common electrodes,
the second block region includes at least the second common electrode and a third common electrode adjacent to the second common electrode out of the plurality of common electrodes and different from the first common electrode, and
the detection value calculator calculates the detection value of each of the plurality of block regions in the display screen based on the detection value of each of the two or more common electrodes included in each of the plurality of block regions.