# US 11,029,774 B2 · Touch panel in which cathodes serve as touch sense electrodes and a touch screen formed using the touch panel

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- Number: US 11,029,774 B2
- Document ID: US11029774B2
- Status: Granted
- Kind: B2
- Application number: 16/029,162
- Filed: 2018-07-06
- Published: 2019-03-28
- Granted: 2021-06-08
- Earliest claimed: 2017-09-26
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.
- Inventors: Shengji Yang; Xue Dong; Xiaochuan Chen; Pengcheng Lu; Lei Wang; Zhi Wang; Weifeng Han; Jing Yu
- Web page: https://patentgrep.com/patent/US11029774B2

## CPC

- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/04184: {Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally}
- G06F 3/0443: {using a single layer of sensing electrodes}
- G09G 3/3225: using an active matrix
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
- G09G 2310/061: for resetting or blanking
- G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements
- G09G 2354/00: Aspects of interface with display user
- 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

The present disclosure relates to a touch panel and a touch screen. In the touch panel, the cathode is reused. In the touch control stage, each of the cathodes serves as a touch electrode, and normal display and touch functions of the touch panel can be realized by a time-division driving manner. Specifically, in the display stage, the pixel circuit controls the light emitting state of each pixel point (each pixel point has a light emitting device including a cathode); in the touch control stage, touch control signals are applied onto all control signal terminals of the pixel circuit and the cathodes at the same time. By doing so, on the basis that the touch control function can be realized, the synchronous driving of the touch control electrodes and the electrodes corresponding to the touch control electrodes can be realized.

## Claims

### Claim 1

A touch panel, comprising:
a plurality of cathodes;
touch wires and touch driving chips individually corresponding to one of the cathodes; and
pixel circuits each disposed in one of pixel units, each of which comprises a light emitting device having one of the cathodes;
wherein:
in a display stage, each of the pixel circuits is configured to drive the light emitting device to emit light normally under control of control signal terminals; and
in a touch control stage, each of the touch driving chip is configured to apply a touch control signal to one of the cathodes through one of the touch wires, wherein each of the cathodes serves as a touch electrode, and apply control signals to the control signal terminals of one of the pixel circuit, wherein the control signals applied to the control signal terminals of one of the pixel circuit are modulated in the touch control stage and modulation of the control signals applied to the control signal terminals of one of the pixel circuit is synchronous with modulation of the touch control signal in the touch control stage, and the control signals applied to the control signal terminals comprises a reset signal, a scan signal, a light emission control signal, a initialization signal, a power signal, a ground power supply signal, and a data signal,
wherein the display stage and the touch control stage do not overlap.

### Claim 2 (depends on 1)

The touch panel of claim 1, wherein each of the pixel circuits comprises a driver, a writer, a power supply, a reset module, a controller and a compensator; wherein:
a control terminal of the reset module is input with the reset signal, an input terminal of the reset module is input with the initialization signal, and an output terminal of the reset module is connected to a first node; the reset module is configured to, under control of the reset signal, initialize the first node by the initialization signal;
a control terminal of the compensator is input with the scan signal, a first input terminal of the compensator is connected to a second node, a second input terminal of the compensator is input with a power supply signal, and an output terminal of the compensator is connected to the first node; the compensator is configured to, under control of the scan signal, compensate a threshold voltage at the first node;
a control terminal of the driver is connected to the first node, an input terminal of the driver is connected to a third node, and an output terminal of the driver is connected to the second node;
the driver is configured to, under control of the first node, make the third node and the second node conducted;
a control terminal of the power supply is input with a light emitting control signal, an input terminal of the power supply is input with the power supply signal, and an output terminal of the power supply is connected to the third node; the power supply is configured to, under control of the light emitting control signal, output the power supply signal to the third node;
a control terminal of the writer is input with the scan signal, an input terminal of the writer is input with the data signal, and an output terminal of the writer is connected to the third node; the writer is configured to, under control of the scan signal, output the data signal to the third node;
a control terminal of the controller is input with the light emitting control signal, an input terminal of the controller is connected to the second node, and an output terminal of the controller is configured to output a driving signal for driving the light emitting device to emit light; the controller is configured to, under control of the light emitting control signal, output a signal at the second node as the driving signal for driving the light emitting device to emit light.

### Claim 3 (depends on 2)

The touch panel of claim 2, wherein the reset module comprises a first switching transistor;
wherein a gate of the first switching transistor is input with the reset signal, a source of the first switching transistor is input with the initialization signal, and a drain of the first switching transistor is connected to the first node.

### Claim 4 (depends on 2)

The touch panel of claim 2, wherein the compensator comprises a second switching transistor and a first capacitor; wherein:
a gate of the second switching transistor is input with the scan signal, a source of the second switching transistor is connected to the second node, and a drain of the second switching transistor is connected to the first node; and
a terminal of the first capacitor is input with the power supply signal, and another terminal of the first capacitor is connected to the first node.

### Claim 5 (depends on 2)

The touch panel of claim 2, wherein the driver comprises a third switching transistor;
wherein a gate of the third switching transistor is connected to the first node, a source of the third switching transistor is connected to the third node, and a drain of the third switching transistor is connected to the second node.

### Claim 6 (depends on 2)

The touch panel of claim 2, wherein the power supply comprises a fourth switching transistor;
wherein a gate of the fourth switching transistor is input with the light emitting control signal, a source of the fourth switching transistor is input with the power supply signal, and a drain of the fourth switching transistor is connected to the third node.

### Claim 7 (depends on 6)

The touch panel of claim 6, wherein the power supply further comprises a second capacitor;
wherein the second capacitor is connected between the source and the drain of the fourth switching transistor.

### Claim 8 (depends on 2)

The touch panel of claim 2, wherein the writer comprises a fifth switching transistor;
wherein a gate of the fifth switching transistor is input with the scan signal, a source of the fifth switching transistor is input with the data signal, and a drain of the fifth switching transistor is connected to the third node.

### Claim 9 (depends on 2)

The touch panel of claim 2, wherein the controller comprises a sixth switching transistor;
wherein a gate of the sixth switching transistor is input with the light emission control signal, a source of the sixth switching transistor is connected to the second node, and a drain of the sixth switching transistor outputs the driving signal for driving the light emitting device to emit light.

### Claim 10

A touch screen, comprising a touch panel;
wherein the touch panel comprises:
a plurality of cathodes;
touch wires and touch driving chips individually corresponding to one of the cathodes; and
pixel circuits each disposed in one of pixel units, each of which comprises a light emitting device having one of the cathodes;
wherein:
in a display stage, each of the pixel circuits is configured to drive the light emitting device to emit light normally under control of control signal terminals; and
in a touch control stage, each of the touch driving chip is configured to apply a touch control signal to one of the cathodes through one of the touch wires, wherein each of the cathodes serves as a touch electrode, and apply a control signal to the control signal terminals of one of the pixel circuit, wherein the control signals applied to the control signal terminals of one of the pixel circuit are modulated in the touch control stage and modulation of the control signals applied to the control signal terminals of one of the pixel circuit is synchronous with modulation of the touch control signal in the touch control stage, and the control signals applied to the control signal terminals comprises a reset signal, a scan signal, a light emission control signal, a initialization signal, a power signal, a ground power supply signal, and a data signal,
wherein the display stage and the touch control stage do not overlap.

### Claim 11 (depends on 10)

The touch screen of claim 10, wherein each of the pixel circuits comprises a driver, a writer, a power supply, a reset module, a controller and a compensator; wherein:
a control terminal of the reset module is input with the reset signal, an input terminal of the reset module is input with the initialization signal, and an input terminal of the reset module is connected to a first node; the reset module is configured to, under control of the reset signal, initialize the first node by the initialization signal;
a control terminal of the compensator is input with a scan signal, a first input terminal of the compensator is connected to a second node, a second input terminal of the compensator is input with the power supply signal, and an output terminal of the compensator is connected to the first node; the compensator is configured to, under control of the scan signal, compensate a threshold voltage at the first node;
a control terminal of the driver is connected to the first node, an input terminal of the driver is connected to a third node, and an output terminal of the driver is connected to the second node;
the driver is configured to, under control of the first node, make the third node and the second node conducted;
a control terminal of the power supply is input with a light emitting control signal, an input terminal of the power supply is input with the power supply signal, and an output terminal of the power supply is connected to the third node; the power supply is configured to, under control of the light emitting control signal, output the power supply signal to the third node;
a control terminal of the writer is input with the scan signal, an input terminal of the writer is input with the data signal, and an output terminal of the writer is connected to the third node; the writer is configured to, under control of the scan signal, output the data signal to the third node;
a control terminal of the controller is input with the light emitting control signal, an input terminal of the controller is connected to the second node, and an output terminal of the controller is configured to output a driving signal for driving the light emitting device to emit light; the controller is configured to, under control of the light emitting control signal, output a signal at the second node as the driving signal for driving the light emitting device to emit light.

### Claim 12 (depends on 11)

The touch screen of claim 11, wherein the reset module comprises a first switching transistor;
wherein a gate of the first switching transistor is input with the reset signal, a source of the first switching transistor is input with the initialization signal, and a drain of the first switching transistor is connected to the first node.

### Claim 13 (depends on 11)

The touch screen of claim 11, wherein the compensator comprises a second switching transistor and a first capacitor; wherein:
a gate of the second switching transistor is input with the scan signal, a source of the second switching transistor is connected to the second node, and a drain of the second switching transistor is connected to the first node; and
a terminal of the first capacitor is input with the power supply signal, and another terminal of the first capacitor is connected to the first node.

### Claim 14 (depends on 11)

The touch screen of claim 11, wherein the driver comprises a third switching transistor;
wherein a gate of the third switching transistor is connected to the first node, a source of the third switching transistor is connected to the third node, and a drain of the third switching transistor is connected to the second node.

### Claim 15 (depends on 11)

The touch screen of claim 11, wherein the power supply comprises a fourth switching transistor;
a gate of the fourth switching transistor is input with the light emitting control signal, a source of the fourth switching transistor is input with the power supply signal, and a drain of the fourth switching transistor is connected to the third node.

### Claim 16 (depends on 15)

The touch screen of claim 15, wherein the power supply further comprises a second capacitor;
wherein the second capacitor is connected between the source and the drain of the fourth switching transistor.

### Claim 17 (depends on 11)

The touch screen of claim 11, wherein the writer comprises a fifth switching transistor;
wherein a gate of the fifth switching transistor is input with the scan signal, a source of the fifth switching transistor is input with the data signal, and a drain of the fifth switching transistor is connected to the third node.

### Claim 18 (depends on 11)

The touch screen of claim 11, wherein the controller comprises a sixth switching transistor;
wherein a gate of the sixth switching transistor is input with the light emission control signal, a source of the sixth switching transistor is connected to the second node, and a drain of the sixth switching transistor outputs the driving signal for driving the light emitting device to emit light.