# US 12,223,907 B2 · Pixel circuit including a compensation control circuit, pixel driving method and display device

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- Number: US 12,223,907 B2
- Document ID: US12223907B2
- Status: Granted
- Kind: B2
- Application number: 18/021,472
- Filed: 2022-04-21
- Published: 2024-08-08
- Granted: 2025-02-11
- Earliest claimed: 2022-04-21
- Assignees: Chengdu Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Chengdu Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Inventors: Yao Huang; Ming Hu
- Web page: https://patentgrep.com/patent/US12223907B2

## CPC

- G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element
- G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters}
- G09G 3/30: using electroluminescent panels
- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED]
- G09G 3/3225: using an active matrix
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 3/3266: Details of drivers for scan electrodes
- G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- 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 pixel circuit includes a light-emitting element, a driving circuit, a first light-emission control circuit, a first initialization circuit, an energy storage circuit, a compensation control circuit and a data written-in circuit. A first terminal of the energy storage circuit is electrically connected to a control terminal of the driving circuit, and a second terminal of the energy storage circuit is electrically connected to a first electrode of the light-emitting element. The data written-in circuit writes a data voltage into a first terminal of the driving circuit under control of a written-in control signal. The compensation control circuit controls the control terminal of the driving circuit to be electrically connected to a second terminal of the driving circuit under control of a compensation control signal.

## Claims

### Claim 1

A pixel driving method for a pixel circuit, wherein the pixel circuit comprises: a light-emitting element, a driving circuit, a first light-emission control circuit, a first initialization circuit, an energy storage circuit, a compensation control circuit and a data written-in circuit; wherein
the first light-emission control circuit is electrically connected to a light-emission control line, a first terminal of the driving circuit and the light-emitting element, and configured to control the first terminal of the driving circuit to be electrically connected to the light-emitting element under control of a light-emission control signal from the light-emission control line;
the first initialization circuit is electrically connected to a reset control line, a first initial voltage terminal and a control terminal of the driving circuit, and configured to write a first initial voltage from the first initial voltage terminal into the control terminal of the driving circuit under control of a reset control signal from the reset control line;
a first terminal of the energy storage circuit is electrically connected to the control terminal of the driving circuit, a second terminal of the energy storage circuit is electrically connected to a first electrode of the light-emitting element, and the energy storage circuit is configured to store electric energy;
the data written-in circuit is electrically connected to a written-in control line, a data line and the first terminal of the driving circuit, and configured to write a data voltage from the data line into the first terminal of the driving circuit under control of a written-in control signal from the written-in control line;
the compensation control circuit is electrically connected to a compensation control line, the control terminal of the driving circuit and a second terminal of the driving circuit, and configured to control the control terminal of the driving circuit to be electrically connected to the second terminal of the driving circuit under control of a compensation control signal from the compensation control line;
wherein a display frame comprises a first initialization stage and a compensation stage arranged one after another, and the pixel driving method comprises:
within the first initialization stage, writing, by the first initialization circuit, a first initial voltage from the first initial voltage terminal into the control terminal of the driving circuit under control of a reset control signal;
within a data written-in time period, writing, by the data written-in circuit, a data voltage from the data line into the first terminal of the driving circuit under control of a written-in control signal;
within the compensation stage, controlling, by the compensation control circuit, the control terminal of the driving circuit to be electrically connected to the second terminal of the driving circuit under control of a compensation control signal;
at the beginning of the data written-in time period, controlling, by the driving circuit, the first terminal of the driving circuit to be electrically connected to the second terminal of the driving circuit under control of a potential at the control terminal of the driving circuit, and charging the energy storage circuit via the data voltage to change the potential at the control terminal of the driving circuit until the first terminal of the driving circuit is electrically disconnected from the second terminal of the driving circuit;
wherein the data written-in time period is same as the compensation stage, or the data written-in time period is comprised in the compensation stage;
wherein the pixel circuit comprises a second light-emission control circuit, a display period further comprises a first light-emission stage arranged after the compensation stage, and the pixel driving method further comprises:
within the first light-emission stage, controlling, by the first light-emission control circuit, the first terminal of the driving circuit to be electrically connected to the light-emitting element under control of a light-emission control signal, controlling, by the second light-emission control circuit, a first voltage terminal to be electrically connected to the second terminal of the driving circuit under control of the light-emission control signal, and driving, by the driving circuit, the light-emitting element to emit light;
wherein the pixel circuit further comprises a second initialization circuit, and the pixel driving method further comprises:
within the compensation stage, writing, by the second initialization circuit, a second initial voltage from a second initial voltage terminal into the first electrode of the light-emitting element under control of an initial control signal, to control the light-emitting element not to emit light, reset a potential at the first electrode of the light-emitting element, and release residual charges at the first electrode of the light-emitting element;
wherein the display frame is a refresh frame, the display period further comprises a maintaining frame, the maintaining frame comprises a second initialization stage and a second light-emission stage arranged one after another, and the pixel driving method further comprises:
within the second initialization stage, writing, by the second initialization circuit, the second initial voltage from the second initial voltage terminal into the first electrode of the light-emitting element under control of the reset control signal, to control the light-emitting element not to emit light, reset the potential at the first electrode of the light-emitting element, and release residual charges at the first electrode of the light-emitting element;
within the second light-emission stage, controlling, by the first light-emission control circuit, the first terminal of the driving circuit to be electrically connected to the light-emitting element under control of the light-emission control signal, controlling, by the second light-emission control circuit, the first voltage terminal to be electrically connected to the second terminal of the driving circuit under control of the light-emission control signal, and driving, by the driving circuit, the light-emitting element to emit light.

### Claim 2 (depends on 1)

The pixel driving method according to claim 1, wherein the pixel circuit further comprises a third initialization circuit, and the pixel driving method further comprises:
within the first initialization stage, writing, by the third initialization circuit, a third initial voltage from a third initial voltage terminal into the second terminal of the driving circuit under control of the reset control signal.

### Claim 3

A pixel circuit, comprising: a light-emitting element, a driving circuit, a first light-emission control circuit, a first initialization circuit, an energy storage circuit, a compensation control circuit and a data written-in circuit; wherein
the first light-emission control circuit is electrically connected to a light-emission control line, a first terminal of the driving circuit and the light-emitting element, and configured to control the first terminal of the driving circuit to be electrically connected to the light-emitting element under control of a light-emission control signal from the light-emission control line;
the first initialization circuit is electrically connected to a reset control line, a first initial voltage terminal and a control terminal of the driving circuit, and configured to write a first initial voltage from the first initial voltage terminal into the control terminal of the driving circuit under control of a reset control signal from the reset control line;
a first terminal of the energy storage circuit is electrically connected to the control terminal of the driving circuit, a second terminal of the energy storage circuit is electrically connected to a first electrode of the light-emitting element, and the energy storage circuit is configured to store electric energy;
the data written-in circuit is electrically connected to a written-in control line, a data line and the first terminal of the driving circuit, and configured to write a data voltage from the data line into the first terminal of the driving circuit under control of a written-in control signal from the written-in control line;
the compensation control circuit is electrically connected to a compensation control line, the control terminal of the driving circuit and a second terminal of the driving circuit, and configured to control the control terminal of the driving circuit to be electrically connected to the second terminal of the driving circuit under control of a compensation control signal from the compensation control line;
wherein the pixel circuit further comprises a second light-emission control circuit; wherein the second light-emission control circuit is electrically connected to the light-emission control line, a first voltage terminal and the second terminal of the driving circuit, and configured to control the first voltage terminal to be electrically connected to the second terminal of the driving circuit under control of the light-emission control signal;
the first light-emission control circuit is electrically connected to the first electrode of the light-emitting element, and a second electrode of the light-emitting element is electrically connected to a second voltage terminal;
wherein the pixel circuit further comprises a second initialization circuit; wherein
the second initialization circuit is electrically connected to an initial control line, a second initial voltage terminal and the first electrode of the light-emitting element, and configured to write a second initial voltage from the second initial voltage terminal into the first electrode of the light-emitting element under control of an initial control signal from the initial control line;
wherein when the pixel circuit operates in a low-frequency driving mode, a display frame is a refresh frame, a display period further comprises a maintaining frame, and the maintaining frame comprises a second initialization stage and a second light-emission stage arranged one after another:
within the second initialization stage, the second initialization circuit is configured to write the second initial voltage from the second initial voltage terminal into the first electrode of the light-emitting element under control of the reset control signal, to control the light-emitting element not to emit light, reset a potential at the first electrode of the light-emitting element, and release residual charges at the first electrode of the light-emitting element;
within the second light-emission stage, the first light-emission control circuit is configured to control the first terminal of the driving circuit to be electrically connected to the light-emitting element under control of the light-emission control signal, the second light-emission control circuit is configured to control the first voltage terminal to be electrically connected to the second terminal of the driving circuit under control of the light-emission control signal, and the driving circuit is configured to drive the light-emitting element to emit light.

### Claim 4 (depends on 3)

The pixel circuit according to claim 3, wherein the data written-in circuit comprises a first transistor, the compensation control circuit comprises a second transistor, the energy storage circuit comprises a storage capacitor, and the driving circuit comprises a driving transistor;
a control electrode of the first transistor is electrically connected to the written-in control line, a first electrode of the first transistor is electrically connected to the data line, and a second electrode of the first transistor is electrically connected to the first terminal of the driving circuit;
a control electrode of the second transistor is electrically connected to the compensation control line, a first electrode of the second transistor is electrically connected to the control terminal of the driving circuit, and a second electrode of the second transistor is electrically connected to the second terminal of the driving circuit;
a first terminal of the storage capacitor is electrically connected to the control terminal of the driving circuit, and a second terminal of the storage capacitor is electrically connected to the first electrode of the light-emitting element;
a control electrode of the driving transistor is the control terminal of the driving circuit, a first electrode of the driving transistor is the first terminal of the driving circuit, and a second electrode of the driving transistor is the second terminal of the driving circuit.

### Claim 5 (depends on 1)

The pixel circuit according to claim 1, wherein the second light-emission control circuit comprises a third transistor, and the first light-emission control circuit comprises a fourth transistor;
a control electrode of the third transistor is electrically connected to the light-emission control line, a first electrode of the third transistor is electrically connected to the first voltage terminal, and a second electrode of the third transistor is electrically connected to the second terminal of the driving circuit;
a control electrode of the fourth transistor is electrically connected to the light-emission control line, a first electrode of the fourth transistor is electrically connected to the first terminal of the driving circuit, and a second electrode of the fourth transistor is electrically connected to the first electrode of the light-emitting element.

### Claim 6 (depends on 3)

The pixel circuit according to claim 3, wherein the first initialization circuit comprises a fifth transistor;
a control electrode of the fifth transistor is electrically connected to the reset control line, a first electrode of the fifth transistor is electrically connected to the first initial voltage terminal, and a second electrode of the fifth transistor is electrically connected to the control terminal of the driving circuit.

### Claim 7 (depends on 1)

The pixel circuit according to claim 1, wherein the second initialization circuit comprises a sixth transistor;
a control electrode of the sixth transistor is electrically connected to the initial control line, a first electrode of the sixth transistor is electrically connected to the second initial voltage terminal, and a second electrode of the sixth transistor is electrically connected to the first electrode of the light-emitting element.

### Claim 8 (depends on 1)

The pixel circuit according to claim 1, further comprising a third initialization circuit;
wherein the third initialization circuit is electrically connected to the reset control line and a third initial voltage terminal, the third initialization circuit is electrically connected to the first terminal of the driving circuit or the second terminal of the driving circuit, and the third initialization circuit is configured to write a third initial voltage from the third initial voltage terminal into the first terminal of the driving circuit or the second terminal of the driving circuit under control of the reset control signal from the reset control line.

### Claim 9 (depends on 8)

The pixel circuit according to claim 8, wherein the third initialization circuit comprises a seventh transistor;
a control electrode of the seventh transistor is electrically connected to the reset control line, a first electrode of the seventh transistor is electrically connected to the third initial voltage terminal, and a second electrode of the seventh transistor is electrically connected to the first terminal of the driving circuit or the second terminal of the driving circuit.

### Claim 10 (depends on 8)

The pixel circuit according to claim 8, wherein a transistor in the first light-emission control circuit and the second light-emission control circuit, a transistor in the data written-in circuit, a transistor in the compensation control circuit, a transistor in the driving circuit, a transistor in the first initialization circuit, a transistor in the second initialization circuit, and a transistor in the third initialization circuit are each an oxide thin film transistor.

### Claim 11 (depends on 1)

A display device comprising the pixel circuit according to claim 1.

### Claim 12 (depends on 11)

The display device according to claim 11, wherein the data written-in circuit comprises a first transistor, the compensation control circuit comprises a second transistor, the energy storage circuit comprises a storage capacitor, and the driving circuit comprises a driving transistor;
a control electrode of the first transistor is electrically connected to the written-in control line, a first electrode of the first transistor is electrically connected to the data line, and a second electrode of the first transistor is electrically connected to the first terminal of the driving circuit;
a control electrode of the second transistor is electrically connected to the compensation control line, a first electrode of the second transistor is electrically connected to the control terminal of the driving circuit, and a second electrode of the second transistor is electrically connected to the second terminal of the driving circuit;
a first terminal of the storage capacitor is electrically connected to the control terminal of the driving circuit, and a second terminal of the storage capacitor is electrically connected to the first electrode of the light-emitting element;
a control electrode of the driving transistor is the control terminal of the driving circuit, a first electrode of the driving transistor is the first terminal of the driving circuit, and a second electrode of the driving transistor is the second terminal of the driving circuit.

### Claim 13 (depends on 11)

The display device according to claim 11, wherein the second light-emission control circuit comprises a third transistor, and the first light-emission control circuit comprises a fourth transistor;
a control electrode of the third transistor is electrically connected to the light-emission control line, a first electrode of the third transistor is electrically connected to the first voltage terminal, and a second electrode of the third transistor is electrically connected to the second terminal of the driving circuit;
a control electrode of the fourth transistor is electrically connected to the light-emission control line, a first electrode of the fourth transistor is electrically connected to the first terminal of the driving circuit, and a second electrode of the fourth transistor is electrically connected to the first electrode of the light-emitting element.