IP Library › Granted Patent US 12676110

Granted Patent B2

US 12676110 · App. 18/548,734 · Granted Jul 7, 2026

Pixel driving circuit, pixel driving method and display device

Inventors: Xilei Cao (Beijing, CN); Benlian Wang (Beijing, CN)

Assignees: CHENGDU BOE OPTOELECTRONICS TECHNOLOGY CO., LTD.; BOE TECHNOLOGY GROUP CO., LTD.

G09G3/3233 G09G3/3225 G09G3/3266 G09G3/3275 G09G3/3291 H10K59/1213 G09G2300/0426 G09G2300/0452 G09G2300/0819 G09G2300/0842 G09G2300/0852 G09G2300/0861 G09G2310/0251 G09G2310/061 G09G2310/08 G09G2320/0233 G09G2320/0247 G09G2320/045 G09G2330/021 H10K59/1216 H10K59/126

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Quick Facts

Patent No.: US 12676110
App. No.: 18/548,734
Granted: Jul 7, 2026
Kind: B2

External Links

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Abstract

A pixel driving circuit, a pixel driving method and a display device are provided. The pixel driving circuit is used for driving a light emitting element, the pixel driving circuit includes a driving circuit and a reset circuit; the reset circuit is electrically connected to a first terminal of the driving circuit or a second terminal of the driving circuit, and is configured to initialize a potential of the first terminal of the driving circuit or a potential of the second terminal of the driving circuit in an initialization phase; the driving circuit is configured to control connection between the first terminal of the driving circuit and the second terminal of the driving circuit under the control of a potential of a control terminal of the driving circuit.

Claims (69)

1 . A pixel driving circuit for driving a light emitting element, wherein the pixel driving circuit comprises a driving circuit and a reset circuit;

the reset circuit is electrically connected to a first terminal of the driving circuit or a second terminal of the driving circuit, and is configured to initialize a potential of the first terminal of the driving circuit or a potential of the second terminal of the driving circuit in an initialization phase;

the driving circuit is configured to control connection between the first terminal of the driving circuit and the second terminal of the driving circuit under the control of a potential of a control terminal of the driving circuit;

wherein the pixel driving circuit further comprises an energy storage circuit, a data writing-in circuit, a compensation control circuit, an on-off control circuit, a first initialization circuit and a second initialization circuit;

the energy storage circuit is electrically connected to the control terminal of the driving circuit and is configured to store electric energy;

the data writing-in circuit is respectively electrically connected to a second scanning line, a data line and the first terminal of the driving circuit, and is configured to control to write a data voltage on the data line into the first terminal of the driving circuit under the control of a second scanning signal provided by the second scanning line;

the on-off control circuit is electrically connected to a first scanning line, the control terminal of the driving circuit and a connection node, and is configured to control to connect the control terminal of the driving circuit and the connection node under the control of a first scanning signal;

the compensation control circuit is electrically connected to the second scanning line, the connection node and the second terminal of the driving circuit, and is configured to control to connect the connection node and the second terminal of the driving circuit under the control of the second scanning signal provided by the second scanning line;

the first initialization circuit is respectively electrically connected to a reset control line, a first initial voltage line and the connection node, and is configured to write a first initial voltage provided by the first initial voltage line into the connection node under the control of a reset control signal provided by the reset control line;

the second initialization circuit is electrically connected to a third scanning line, a second initial voltage line and a first electrode of the light emitting element respectively, and is configured to write a second initial voltage provided by the second initial voltage line into the first electrode of the light emitting element under the control of a third scanning signal provided by the third scanning line.

2 . The pixel driving circuit according to claim 1 , further comprising a first light emitting control circuit and a second light emitting control circuit; wherein

the first light emitting control circuit is electrically connected to a first light emitting control line, the first terminal of the driving circuit and a first voltage line respectively, and is configured to control to connect the first terminal of the driving circuit and the first voltage line under the control of a first light emitting control signal provided by the first light emitting control line;

the second light emitting control circuit is electrically connected to a second light emitting control line, the second terminal of the driving circuit and a first electrode of the light emitting element, is configured to control to connect the second terminal of the driving circuit and the first electrode of the light emitting element under the control of a second light emitting control signal provided by the second light emitting control line;

a second electrode of the light emitting element is electrically connected to a second voltage line.

3 . The pixel driving circuit according to claim 2 , wherein the reset circuit comprises a first capacitor; the first light emitting control line and the second light emitting control line are a same light emitting control line;

a first electrode plate of the first capacitor is electrically connected to the light emitting control line, and a second electrode plate of the first capacitor is electrically connected to the first terminal of the driving circuit or the second terminal of the driving circuit.

4 . The pixel driving circuit according to claim 3 , wherein the first capacitor is a capacitor formed between the light emitting control line and a conductive pattern; the light emitting control line is formed by a metal layer, and the conductive pattern is formed by another metal layer included in the pixel driving circuit; the conductive pattern is electrically connected to the first terminal of the driving circuit or the second terminal of the driving circuit.

5 . The pixel driving circuit according to claim 2 , wherein the reset circuit comprises a first transistor;

a control electrode of the first transistor is electrically connected to a reset control line, a first electrode of the first transistor is electrically connected to a reset voltage line, and a second electrode of the first transistor is connected to the first terminal of the driving circuit or the second terminal of the driving circuit.

6 . The pixel driving circuit according to claim 2 , wherein the reset circuit comprises a first transistor;

a control electrode of the first transistor is electrically connected to a reset control line, a first electrode of the first transistor is electrically connected to a first connection point, and a second electrode of the first transistor is electrically connected to a second connection point, the first connection point is a connection point on a first connection line between the first light emitting control circuit and the first terminal of the driving circuit, and the second connection point is another connection point on the first connection line;

or,

the control electrode of the first transistor is electrically connected to the reset control line, the first electrode of the first transistor is electrically connected to a third connection point, and the second electrode of the first transistor is electrically connected to a fourth connection point, the third connection point is a connection point on a second connection line between the second terminal of the driving circuit and the first electrode of the light emitting element, and the fourth connection point is another connection point on the second connection line.

7 . The pixel driving circuit according to claim 1 , further comprising a light emitting element and a second light emitting control circuit; wherein

the first terminal of the driving circuit is electrically connected to a first voltage line;

the second light emitting control circuit is electrically connected to a second light emitting control line, and the second terminal of the driving circuit is electrically connected to a first electrode of the light emitting element, is configured to control the connection between the second terminal of the driving circuit and the first electrode of the light emitting element under the control of a second light emitting control signal provided by the second light emitting control line;

a second electrode of the light emitting element is electrically connected to a second voltage line;

the reset circuit is electrically connected to the second terminal of the driving circuit, and is configured to initialize the potential of the second terminal of the driving circuit in the initialization phase.

8 . The pixel driving circuit according to claim 7 , wherein the reset circuit includes a first capacitor, a first electrode plate of the first capacitor is electrically connected to the second light emitting control line, and the first capacitor is electrically connected to the second terminal of the driving circuit; or,

the reset circuit includes a first transistor, a control electrode of the first transistor is electrically connected to a reset control line, the control electrode of the first transistor is electrically connected to a reset voltage line, and a second electrode of the first transistor is electrically connected to the second terminal of the driving circuit; or,

the reset circuit includes the first transistor; the control electrode of the first transistor is electrically connected to the reset control line, the first electrode of the first transistor is electrically connected to a third connection point, and the second electrode of the first transistor is electrically connected to a fourth connection point, the third connection point is a connection point on a second connection line between the second terminal of the driving circuit and the first electrode of the light emitting element, the fourth connection point is another connection point on the second connection line;

wherein the reset circuit comprises a first capacitor;

the first capacitor is a capacitor formed between the second light emitting control line and a conductive pattern; the second light emitting control line is formed by a metal layer, the conductive pattern is formed by another metal layer included in the pixel driving circuit.

9 . A pixel driving method, applied to the pixel driving circuit according to claim 1 , comprising:

initializing, by the reset circuit, the potential of the first terminal of the driving circuit or the potential of the second terminal of the driving circuit in the initialization phase.

10 . The pixel driving method according to claim 9 , wherein the pixel driving circuit further includes a first light emitting control circuit and a second light emitting control circuit; the reset circuit includes a first capacitor; the first light emitting control line and the second light emitting control line are a same light emitting control line; a first electrode plate of the first capacitor is electrically connected to the light emitting control line, and a second electrode plate of the first capacitor is connected to the first terminal of the driving circuit or the second terminal of the driving circuit electrical connection;

the step of initializing, by the reset circuit, the potential of the first terminal of the driving circuit or the potential of the second terminal of the driving circuit in the initialization phase includes:

in the initialization phase, the second electrode plate of the first capacitor being in a floating state, and a potential of the second electrode plate of the first capacitor changing with a potential of the light emitting control signal on the light emitting control line to initialize the potential of the first terminal of the driving circuit or the potential of the second terminal of the driving circuit.

11 . The pixel driving method according to claim 9 , wherein the pixel driving circuit further includes a first light emitting control circuit and a second light emitting control circuit; the reset circuit includes a first transistor; a control electrode of the first transistor is electrically connected to a reset control line, and a first electrode of the first transistor is electrically connected to a reset voltage line, and a second electrode of the first transistor is electrically connected to the first terminal of the driving circuit or the second terminal of the driving circuit;

in the initialization phase, under the control of a reset control signal provided by the reset control line, the first transistor being turned on, to write a reset voltage provided by the reset voltage line into the first terminal of the driving circuit or the second terminal of the driving circuit.

12 . The pixel driving method according to claim 9 , wherein the pixel driving circuit further includes a first light emitting control circuit and a second light emitting control circuit; the reset circuit includes a first transistor; a control electrode of the first transistor is electrically connected to a reset control line, and a first electrode of the first transistor is electrically connected to a first connection point, a second electrode of the first transistor is electrically connected to a second connection point, and the first connection point is a connection point on a first connection line between the first light emitting control circuit and the first terminal of the driving circuit, the second connection point is another connection point on the first connection line;

in the initialization phase, under the control of a reset control signal provided by the reset control line, the first transistor being turned on to serve as a capacitor, so as to control the potential of the first terminal of the driving circuit.

13 . The pixel driving method according to claim 9 , wherein the pixel driving circuit further includes a first light emitting control circuit and a second light emitting control circuit; the reset circuit includes a first transistor; a control electrode of the first transistor is electrically connected to a reset control line, and a first electrode of the first transistor is electrically connected to a third connection point, a second electrode of the first transistor is electrically connected to a fourth connection point, and the third connection point is a connection point on a second connection line between the second terminal of the driving circuit and a first electrode of the light emitting element, the fourth connection point is another connection point on the second connection line;

14 . The pixel driving method according to claim 12 , wherein the display period further includes a data writing-in phase and a light emitting phase set after the initialization phase; the pixel driving method further includes:

in the data writing-in phase and the light emitting phase, under the control of the reset control signal provided by the reset control line, the first transistor being turned off.

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

16 . A pixel driving circuit for driving a light emitting element, wherein the pixel driving circuit comprises a driving circuit and a reset circuit;

wherein the pixel driving circuit further comprises an energy storage circuit, a data writing-in circuit, a compensation control circuit, a first initialization circuit and a second initialization circuit; wherein

the energy storage circuit is electrically connected to the control terminal of the driving circuit and is configured to store electric energy;

the data writing-in circuit is electrically connected to a scanning line, a data line and the first terminal of the driving circuit, and is configured to control to write a data voltage on the data line into the first terminal of the driving circuit under the control of a scanning signal provided by the scanning line;

the compensation control circuit is electrically connected to the scanning line, the control terminal of the driving circuit, and the second terminal of the driving circuit, and is configured to control to connect the control terminal of the driving circuit and the second terminal of the driving circuit under the control of the scanning signal;

the first initialization circuit is electrically connected to a first initial control line, a first initial voltage line, and the control terminal of the driving circuit, and is configured to write a first initial voltage provided by the first initial voltage line into the control terminal of the driving circuit under the control of a first initial control signal provided by the first initial control line;

the second initialization circuit is electrically connected to a second initial control line, a second initial voltage line and the first electrode of the light emitting element respectively, and is configured to write a second initial voltage provided by the second initial voltage line into the first electrode of the light emitting element under the control of a second initial control signal provided by the second initial control line.

17 . A pixel driving circuit for driving a light emitting element, wherein the pixel driving circuit comprises a driving circuit and a reset circuit;

wherein the pixel driving circuit further comprises a data writing-in circuit, an energy storage circuit, a compensation control circuit, a first initialization circuit, a second initialization circuit and a setting circuit; wherein

the compensation control circuit is electrically connected to a first scanning line, the control terminal of the driving circuit and the second terminal of the driving circuit respectively, is configured to control to connect the control terminal of the driving circuit and the second terminal of the driving circuit under the control of a first scanning signal provided by the first scanning 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 control node, and the energy storage circuit is configured to store electric energy;

the data writing-in circuit is respectively electrically connected to a second scanning line, a data line and the control node, and is configured to write a data voltage on the data line into the control node under the control of a second scanning signal provided by the second scanning line;

the second initialization circuit is electrically connected to a second initial control line, a second initial voltage line and the control node respectively, and is configured to write a second initial voltage provided by the second initial voltage line into the control node under the control of a second initial control signal provided by the second initial control line;

the setting circuit is respectively electrically connected to a second light emitting control line, the second initial voltage line and the control node, and is configured to write a second initial voltage into the control node under the control of a second light emitting control signal provided by the second light emitting control line.