Display panel and display device
View Patent ↗Provided are a display panel and a display device. The display panel includes a pixel circuit and a light-emitting element. The pixel circuit includes a drive module and a bias adjustment module. The drive module is configured to provide a drive current to the light-emitting element, and includes a drive transistor. The bias adjustment module is connected between a first terminal of the drive transistor and a bias signal terminal, a control terminal of the bias adjustment module is connected to a first scan signal terminal, and a second terminal of the drive transistor is coupled to the light-emitting element. A working process of the pixel circuit includes a pre-stage, the pre-stage includes a bias adjustment stage, the bias adjustment module is turned on in the bias adjustment stage, and the bias signal terminal provides a bias signal to the first terminal of the drive transistor.
1 . A display panel, comprising:
a pixel circuit and a light-emitting element,
wherein the pixel circuit comprises a drive circuit and a bias adjustment circuit, the drive circuit is configured to provide a drive current to the light-emitting element and comprises a drive transistor, the bias adjustment circuit is connected between a first terminal of the drive transistor and a bias signal terminal, a control terminal of the bias adjustment circuit is connected to a first scan signal terminal, and a second terminal of the drive transistor is coupled to the light-emitting element; and
wherein a working process of the pixel circuit comprises a pre-stage, the pre-stage comprises a bias adjustment stage, the bias adjustment circuit is turned on in the bias adjustment stage, and the bias signal terminal provides a bias signal to the first terminal of the drive transistor,
wherein the pixel circuit comprises a compensation circuit, the compensation circuit is connected between the first terminal of the drive transistor and a gate of the drive transistor, and a control terminal of the compensation circuit is connected to a second scan signal terminal;
the pre-stage comprises a compensation stage, and the compensation circuit is turned on in the compensation stage to compensate for a threshold voltage of the drive transistor; and
the compensation circuit is turned off in the bias adjustment stage,
wherein the bias adjustment stage comprises a first sub-stage and a second sub-stage disposed at intervals;
in the first sub-stage, the compensation circuit is turned off and the bias adjustment circuit is turned on;
in the second sub-stage, the compensation circuit is turned off and the bias adjustment circuit is turned on; and
the compensation stage is between the first sub-stage and the second sub-stage.
2 . The display panel of claim 1 , wherein the drive transistor is a P-type transistor, and a bias signal provided by the bias signal terminal in the bias adjustment stage is a high-level signal; or
the drive transistor is an N-type transistor, and a bias signal provided by the bias signal terminal in the bias adjustment stage is a low-level signal.
3 . The display panel of claim 1 , wherein the bias adjustment circuit comprises a first transistor, a gate of the first transistor is connected to the first scan signal terminal, and the first transistor is connected between the first terminal of the drive transistor and the bias signal terminal.
4 . The display panel of claim 1 , wherein the compensation circuit comprises a second transistor, a gate of the second transistor is connected to the second scan signal terminal, and the second transistor is connected between the first terminal of the drive transistor and the gate of the drive transistor, wherein the drive transistor is a P-type transistor, and the second transistor is an N-type transistor.
5 . The display panel of claim 1 , wherein in part of a time period of the compensation stage, the bias adjustment circuit is turned on, and the bias signal terminal provides a reset signal for the first terminal of the drive transistor; and
the bias adjustment circuit is turned off in remaining part of the time period of the compensation stage,
wherein the drive transistor is a P-type transistor, and a bias signal provided by the bias signal terminal in the bias adjustment stage is a high-level signal, and a reset signal provided by the bias signal terminal in the compensation stage is a low-level signal; or
the drive transistor is an N-type transistor, and a bias signal provided by the bias signal terminal in the bias adjustment stage is a low-level signal, and a reset signal provided by the bias signal terminal in the compensation stage is a high-level signal.
6 . The display panel of claim 1 , wherein the pixel circuit comprises a data write circuit, the data write circuit is connected between the second terminal of the drive transistor and a data signal terminal, and a control terminal of the data write circuit is connected to a third scan signal terminal;
the pre-stage comprises a data write stage, in the data write stage, the data write circuit is turned on, the bias adjustment circuit is turned off, and the data signal terminal provides a data signal for the drive transistor; and
the data write circuit is turned off in the bias adjustment stage.
7 . The display panel of claim 6 , wherein the data write circuit comprises a third transistor, a gate of the third transistor is connected to the third scan signal terminal, and the third transistor is connected between the second terminal of the drive transistor and the data signal terminal,
wherein the data write circuit comprises a first capacitor, and the first capacitor is connected between the gate of the drive transistor and the gate of the third transistor.
8 . The display panel of claim 6 , wherein in part of a time period of the compensation stage, the data write circuit is turned on to enable the pixel circuit to simultaneously execute the data write stage.
9 . The display panel of claim 6 , wherein the third scan signal terminal provides a third scan signal, and the first scan signal terminal provides a first scan signal; and
a pulse variation frequency of the third scan signal is less than a pulse variation frequency of the first scan signal.
10 . The display panel of claim 9 , wherein the display panel comprises a first display region and a second display region; and
a first frequency difference value is not equal to a second frequency difference value, wherein the first frequency difference value is a difference between a pulse variation frequency of the first scan signal and a pulse variation frequency of the third scan signal in the first display region, and the second frequency difference value is a difference between a pulse variation frequency of the first scan signal and a pulse variation frequency of the third scan signal in the second display region.
11 . The display panel of claim 1 , wherein a working process of the pixel circuit comprises a data write frame and a retention frame; and
a number of turn-on times of the bias adjustment circuit in the retention frame is greater than a number of turn-on times of the bias adjustment circuit in the data write frame.
12 . The display panel of claim 11 , wherein the display panel comprises a first display region and a second display region; and
a first turn-on difference value is not equal to a second turn-on difference value, wherein the first turn-on difference value is a difference value between the number of turn-on times of the bias adjustment circuit in the retention frame and the number of turn-on times of the bias adjustment circuit in the data write frame in the first display region, and a second turn-on difference value is a difference value between the number of turn-on times of the bias adjustment circuit in the retention frame and the number of turn-on times of the bias adjustment circuit in the data write frame in the second display region.
13 . The display panel of claim 1 , wherein the pixel circuit comprises an initialization circuit, the initialization circuit is connected between the light-emitting element and an initialization signal terminal, and a control terminal of the initialization circuit is connected to a fourth scan signal terminal; and
the pre-stage comprises an initialization stage, the initialization circuit is turned on in the initialization stage, and the initialization signal terminal provides an initialization signal for the light-emitting element,
wherein the initialization circuit comprises a fourth transistor, a gate of the fourth transistor is connected to the fourth scan signal terminal, and the fourth transistor is connected between the light-emitting element and the initialization signal terminal.
14 . The display panel of claim 13 , wherein the first scan signal terminal is also served as the fourth scan signal terminal.
15 . The display panel of claim 1 , wherein the pixel circuit comprises a first dimming circuit and a second dimming circuit;
the first dimming circuit is connected between a first power supply signal terminal and a first terminal of the drive transistor, and a control terminal of the first dimming circuit is connected to a first dimming control terminal;
the second dimming circuit is connected between a second terminal of the drive transistor and the light-emitting element, and a control terminal of the second dimming circuit is connected to a second dimming control terminal; and
the first dimming circuit and the second dimming circuit are turned off in the pre-stage.
16 . The display panel of claim 15 , wherein,
the first dimming circuit comprises a fifth transistor, a gate of the fifth transistor is connected to the first dimming control terminal, and the fifth transistor is connected between the first power supply signal terminal and the first terminal of the drive transistor; and
the second dimming circuit comprises a sixth transistor, a gate of the sixth transistor is connected to the second dimming control terminal, and the sixth transistor is connected between the second terminal of the drive transistor and the light-emitting element.
17 . The display panel of claim 15 , wherein the first dimming control terminal is also served as the second dimming control terminal.
18 . A display device comprising a display panel,
wherein the display panel comprises:
a pixel circuit and a light-emitting element,
wherein the pixel circuit comprises a drive circuit and a bias adjustment circuit, the drive circuit is configured to provide a drive current to the light-emitting element and comprises a drive transistor, the bias adjustment circuit is connected between a first terminal of the drive transistor and a bias signal terminal, a control terminal of the bias adjustment circuit is connected to a first scan signal terminal, and a second terminal of the drive transistor is coupled to the light-emitting element; and
wherein a working process of the pixel circuit comprises a pre-stage, the pre-stage comprises a bias adjustment stage, the bias adjustment circuit is turned on in the bias adjustment stage, and the bias signal terminal provides a bias signal to the first terminal of the drive transistor,
wherein the pixel circuit comprises a compensation circuit, the compensation circuit is connected between the first terminal of the drive transistor and a gate of the drive transistor, and a control terminal of the compensation circuit is connected to a second scan signal terminal;
the pre-stage comprises a compensation stage, and the compensation circuit is turned on in the compensation stage to compensate for a threshold voltage of the drive transistor; and
the compensation circuit is turned off in the bias adjustment stage,
wherein the bias adjustment stage comprises a first sub-stage and a second sub-stage disposed at intervals;
in the first sub-stage, the compensation circuit is turned off and the bias adjustment circuit is turned on;
in the second sub-stage, the compensation circuit is turned off and the bias adjustment circuit is turned on; and
the compensation stage is between the first sub-stage and the second sub-stage.