# US 10,768,756 B2 · Display device and circuit board

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,768,756 B2
- Document ID: US10768756B2
- Status: Granted
- Kind: B2
- Application number: 16/029,704
- Filed: 2018-07-09
- Published: 2019-01-10
- Granted: 2020-09-08
- Earliest claimed: 2017-07-10
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Hayato Kurasawa; Hiroshi Mizuhashi; Tadayoshi Katsuta
- Web page: https://patentgrep.com/patent/US10768756B2

## CPC

- G06F 3/0412: {Digitisers structurally integrated in a display}
- 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 3/0418: {for error correction or compensation, e.g. based on parallax, calibration or alignment}
- G06F 3/044: by capacitive means
- G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer}
- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- G06F 3/046: by electromagnetic means
- G09G 3/344: {based on particles moving in a fluid or in a gas, e.g. electrophoretic devices (electrophoretic devices per se G02F1/167)}
- G09G 3/3696: {Generation of voltages supplied to electrode drivers}
- 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
- 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
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2310/0202: Addressing of scan or signal lines
- G09G 2310/068: Application of pulses of alternating polarity prior to the drive pulse in electrophoretic displays
- G09G 2310/08: Details of timing specific for flat panels, other than clock recovery
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A display device includes a substrate, first electrodes, lines, pixel electrodes, a display functional layer, a common electrode, second electrodes, and a controller. The first electrodes are opposed to the second electrodes with a space therebetween, and an insulating layer is provided between the common electrode and the first and second electrodes. During the display periods, in response to a control signal from the controller, the pixel electrodes are supplied with a pixel signal through the lines, and the common electrode is supplied with a common signal. During the sensing period, in response to the control signal from the controller, the lines are supplied with a first drive signal to generate a magnetic field. The first electrodes are supplied with a second drive signal to generate electrostatic capacitance between themselves and the second electrodes in response to the control signal from the controller, synchronously or asynchronously with the display periods.

## Claims

### Claim 1

A display device comprising:
a substrate;
a plurality of first electrodes;
a plurality of lines;
a plurality of pixel electrodes;
a display functional layer;
a common electrode opposed to the pixel electrodes;
a plurality of second electrodes;
a plurality of third electrodes provided between the substrate and the pixel electrodes;
an analog front-end circuit;
a switching circuit provided between the analog front-end circuit and the second and third electrodes, and configured to switch a coupling state between the second electrodes and the analog front-end circuit and a coupling state between the third electrodes and the analog front-end circuit; and
a controller,
wherein the substrate, the pixel electrodes, the display functional layer, and the common electrode are stacked in the order as listed,
wherein the first electrodes are opposed to the second electrodes with a space therebetween, and an insulating layer is provided between the common electrode and the first and second electrodes,
wherein the controller is configured to
perform processing during a plurality of display periods to display an image and during a sensing period in a time-division manner, and
control the pixel electrodes, the common electrode, the lines, the first electrodes, the second electrodes, and the third electrodes according to the display and sensing periods,
wherein, during the display periods, in response to a control signal from the controller, the pixel electrodes are supplied with a pixel signal through the lines, and the common electrode is supplied with a common signal,
wherein, during the sensing period, in response to the control signal from the controller, the lines are supplied with a first drive signal to generate a magnetic field, and an electromotive force caused by the magnetic field is generated in the third electrodes,
wherein, the first electrodes are supplied with a second drive signal to generate electrostatic capacitance between themselves and the second electrodes in response to the control signal from the controller, synchronously or asynchronously with the display periods, and
wherein the switching circuit is configured to
couple the third electrodes to the analog front-end circuit during the sensing period, and
couple the second electrodes to the analog front-end circuit during a period different from the sensing period.

### Claim 2 (depends on 1)

The display device according to claim 1,
wherein a switch is provided that is configured to couple together ends on the same side of a pair of the lines, and
wherein, the controller is configured to
couple the pair of the lines to each other by operating the switch during the sensing period, and
uncouple the pair of the lines from each other by operating the switch during a period different from the sensing period.

### Claim 3 (depends on 1)

The display device according to claim 1, further comprising:
a first voltage supply configured to supply a first voltage to the lines; and
a second voltage supply configured to supply a second voltage lower than the first voltage to the lines,
wherein, during the sensing period, in response to the control signal from the controller,
the first voltage supply is coupled to one end of at least one of the lines,
the second voltage supply is coupled to the other end of the at least one of the lines,
the second voltage supply is coupled to one end of another line of the lines, and
the first voltage supply is coupled to the other end of the other line of the lines.

### Claim 4 (depends on 1)

The display device according to claim 1,
wherein the third electrodes are provided so as to intersect with the lines in a plan view.

### Claim 5 (depends on 1)

The display device according to claim 1,
wherein an insulating substrate is provided between the first electrodes and the second electrodes,
wherein the first electrodes are provided so as to intersect with the lines in the plan view, and
wherein the second electrodes are provided so as to intersect with the first electrodes in the plan view.

### Claim 6 (depends on 1)

The display device according to claim 1,
wherein the controller is configured to:
supply the first drive signal to the lines to generate the magnetic field such that an electromotive force caused by the magnetic field is generated in the second electrodes during the sensing period, and
supply the second drive signal to the first electrodes to generate the electrostatic capacitance between the first electrodes and the second electrodes during a period different from the sensing period.

### Claim 7 (depends on 6)

The display device according to claim 6,
wherein the second electrodes are provided so as to intersect with the lines in the plan view, and
wherein the first electrodes are provided so as to intersect with the second electrodes in the plan view.

### Claim 8 (depends on 6)

The display device according to claim 6,
wherein the third electrodes extend along the lines.

### Claim 9 (depends on 8)

The display device according to claim 8,
wherein the third electrodes opposed to the lines supplied with the first drive signal are supplied with the same potential signal as the first drive signal during the sensing period.

### Claim 10 (depends on 8)

The display device according to claim 8,
wherein the first electrodes and the third electrodes extend along the lines in the plan view, and are supplied with a same potential signal as each other during the sensing period.

### Claim 11 (depends on 8)

The display device according to claim 8,
wherein the lines are covered with a planarizing film, and the third electrodes are provided on a surface of the planarizing film.

### Claim 12 (depends on 11)

The display device according to claim 11,
wherein each of the third electrodes includes a metal layer and a light-transmitting conductive layer covering the metal layer.

### Claim 13 (depends on 6)

The display device according to claim 6,
wherein the display functional layer is a self-luminous layer containing a polymeric organic material.

### Claim 14 (depends on 1)

The display device according to claim 1,
wherein the display functional layer is a liquid crystal layer, and is configured to change in orientation from an initial orientation according to an electric field generated between the pixel electrodes and the common electrode during the display periods.

### Claim 15 (depends on 1)

The display device according to claim 1,
wherein the first electrodes and the second electrodes are provided in the same layer, and an insulating substrate is provided between the common electrode and both the first electrodes and the second electrodes, and
wherein the first electrodes are coupled together in a first direction through a coupling line, and the second electrodes are coupled together in a second direction intersecting with the first direction through bridge wiring provided in a layer different from that of the second electrodes and the first electrodes.

### Claim 16

A display device comprising:
a substrate;
a plurality of first electrodes;
a plurality of lines;
a plurality of pixel electrodes;
a display functional layer;
a common electrode opposed to the pixel electrodes;
a plurality of second electrodes;
a plurality of third electrodes provided between the substrate and the pixel electrodes;
an analog front-end circuit;
a switching circuit provided between the analog front-end circuit and both the second electrodes and the lines, and configured to switch a coupling state between the second electrodes and the analog front-end circuit and a coupling state between the lines and the analog front-end circuit; and
a controller,
wherein the substrate, the pixel electrodes, the display functional layer, and the common electrode are stacked in this order,
wherein the first electrodes are opposed to the second electrodes with a space therebetween, and an insulating layer is provided between the common electrode and the first and second electrodes,
wherein the controller is configured to
perform processing during a plurality of display periods to display an image and during a sensing period in a time-division manner, and
control the pixel electrodes, the common electrode, the lines, the first electrodes, the second electrodes, and the third electrodes according to the periods,
wherein, during the display periods, in response to a control signal from the controller, the pixel electrodes are supplied with a pixel signal through the lines, and the common electrode is supplied with a common signal,
wherein, during the sensing period, in response to the control signal from the controller, the third electrodes are supplied with a first drive signal to generate a magnetic field to generate an electromotive force caused by the magnetic field in the lines, and
wherein, the first electrodes are supplied with a second drive signal to generate electrostatic capacitance between themselves and the second electrodes in response to the control signal from the controller, synchronously or asynchronously with the display periods, and
wherein the switching circuit is configured to
couple the lines to the analog front-end circuit during the sensing period, and
couple the second electrodes to the analog front-end circuit during a period different from the sensing period.