Pixel circuit and driving method therefor

Patent metadata

Field	Value
Publication number	US-2026080820-A1
Application number	US-202519402872-A
Country	US
Kind code	A1
Filing date	Nov 26, 2025
Priority date	May 31, 2023
Publication date	Mar 19, 2026
Grant date	—

Abstract

Disclosed are a pixel circuit and a driving method therefor. The pixel circuit includes: a driving module ( 110 ), a voltage writing module ( 120 ), a compensation module ( 130 ), a coupling module ( 140 ), and a first initialization module ( 150 ). The first initialization module ( 150 ) is connected to a second terminal N 2 of the driving module ( 110 ). The first initialization module ( 150 ) is configured to control a magnitude of a current flowing through the driving module ( 110 ). The compensation module ( 130 ) is connected between a control terminal G and a first terminal N 1 of the driving module ( 110 ). The compensation module ( 130 ) is configured to compensate for a threshold voltage of the driving module ( 110 ) in a compensation phase based on a voltage at the first terminal N 1 of the driving module ( 110 ) obtained after the first terminal N 1 is discharged via the driving module ( 110 ) and the first initialization module ( 150 ).

First claim

1 . A pixel circuit, comprising:
a driving module, a voltage writing module, a compensation module, a coupling module, and a first initialization module, wherein the first initialization module is connected to a second terminal of the driving module, and the first initialization module is configured to control a magnitude of a current flowing through the driving module; the compensation module is connected between a control terminal and a first terminal of the driving module, and the compensation module is configured to compensate for a threshold voltage of the driving module in a compensation phase based on a voltage at the first terminal of the driving module obtained after the first terminal is discharged via the driving module and the first initialization module; and a first terminal of the coupling module is connected to the voltage writing module, a second terminal of the coupling module is connected to the first terminal of the driving module, the voltage writing module is configured to output a fixed voltage to the first terminal of the coupling module at least in the compensation phase and output a data voltage to the first terminal of the coupling module in a data writing phase, and the coupling module is configured to couple a voltage containing information about the data voltage to the control terminal of the driving module via the compensation module in the data writing phase, wherein the data writing phase is later than the compensation phase.

2 . The pixel circuit according to claim 1 , further comprising a light-emitting module, wherein the driving module and the light-emitting module are connected between a first power supply voltage terminal and a second power supply voltage terminal, and the driving module is configured to drive the light-emitting module to emit light in a light emission phase.

3 . The pixel circuit according to claim 2 , further comprising a first light emission control module and a second light emission control module, wherein the second light emission control module is connected between the first power supply voltage terminal and the first terminal of the driving module, the first light emission control module is connected between the second terminal of the driving module and a first terminal of the light-emitting module, and a second terminal of the light-emitting module is connected to the second power supply voltage terminal; and a control terminal of the first light emission control module and a control terminal of the second light emission control module are both connected to a light emission control signal line.

4 . The pixel circuit according to claim 2 , further comprising a second initialization module, wherein the second initialization module is connected between a second initialization signal line and the first terminal of the light-emitting module, a control terminal of the second initialization module is connected to a first scan line, and the second initialization module is configured to transmit a second initialization voltage on the second initialization signal line to the first terminal of the light-emitting module at least in the compensation phase;
the first initialization module is connected between a first initialization signal line and the second terminal of the driving module;
a first initialization voltage on the first initialization signal line is greater than the second initialization voltage;
a control terminal of the compensation module is connected to a second scan line; and
a start moment of the data writing phase is later than an end moment of the compensation phase.

5 . The pixel circuit according to claim 1 , wherein the voltage writing module comprises a data writing unit, a control terminal of the data writing unit is connected to a third scan line, a first terminal of the data writing unit is connected to a data line, and a second terminal of the data writing unit is connected to the first terminal of the coupling module;
the data line is configured to transmit the fixed voltage in an initialization phase to initialize a potential at the first terminal of the coupling module, continue transmitting the fixed voltage in the compensation phase, and transmit the data voltage in the data writing phase; and the compensation module is further configured to transmit a potential at the first terminal of the driving module to the control terminal of the driving module in the compensation phase.

6 . The pixel circuit according to claim 1 , wherein the voltage writing module comprises a data writing unit and a reset unit, a first terminal of the reset unit is connected to the fixed voltage, a second terminal of the reset unit is connected to the first terminal of the coupling module, the first terminal of the coupling module is further connected to a second terminal of the data writing unit, a first terminal of the data writing unit is connected to a data line, a control terminal of the data writing unit is connected to a third scan line, a control terminal of the reset unit is connected to a fourth scan line, the reset unit is configured to transmit the fixed voltage to the first terminal of the coupling module in an initialization phase and continue transmitting the fixed voltage to the first terminal of the coupling module in the compensation phase, and the data writing unit is configured to transmit the data voltage to the first terminal of the coupling module in the data writing phase.

7 . The pixel circuit according to claim 6 , wherein the first initialization module is connected between a first initialization signal line and the second terminal of the driving module, a first initialization voltage on the first initialization signal line is reused as the fixed voltage, and a control terminal of the first initialization module is connected to the fourth scan line.

8 . The pixel circuit according to claim 6 , further comprising a storage module, wherein the storage module is connected between the control terminal of the driving module and a first terminal of a light-emitting module.

9 . The pixel circuit according to claim 4 , wherein the first scan line is reused as the second scan line; and
the pixel circuit further comprises a third initialization module, a control terminal of the third initialization module is connected to a fifth scan line, a first terminal of the third initialization module is connected to the second initialization signal line, a second terminal of the third initialization module is connected to the first terminal of the light-emitting module, and the third initialization module is configured to transmit the second initialization voltage to the first terminal of the light-emitting module in an initialization phase in a write frame of a display cycle, and transmit the second initialization voltage to the first terminal of the light-emitting module in an initialization phase in a hold frame of the same display cycle.

10 . A pixel circuit, comprising:
a driving module, a compensation module, a first initialization module, a second initialization module, a first light emission control module, and a light-emitting module, wherein the driving module and the light-emitting module are connected between a first power supply voltage terminal and a second power supply voltage terminal, and the driving module is configured to drive the light-emitting module to emit light in a light emission phase; the first light emission control module is connected between a second terminal of the driving module and a first terminal of the light-emitting module, the first initialization module is connected to the second terminal of the driving module, and the first initialization module is configured to control a magnitude of a current flowing thr

Assignees

• Yungu Gu’An Tech Co Ltd

Inventors

• Guo Enqing
• Gai Cuili
• Li Junfeng
• Pan Kangguan

Classifications

• G09G3/3233

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G2320/0257

  Reduction of after-image effects · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title