CN116453441A - Pixel circuit, driving method thereof and display panel - Google Patents

Abstract

The invention discloses a pixel circuit, a driving method thereof and a display panel, wherein the pixel circuit comprises at least one switch module, a driving module and a light emitting module; the at least one switch module is electrically connected with the driving module, the at least one switch module comprises a first transistor and a second transistor which are connected in series, the at least one switch module comprises at least one first display frame and at least one second display frame in the display process of the pixel circuit, in the first display frame, in the stage of turning off the switch module, a first control signal line is used for controlling the first transistor to be turned off, and a second control signal line is used for controlling the second transistor to be turned on; in the second display frame, in the stage of turning off the switch module, the first control signal line is used for controlling the first transistor to be turned on, and the second control signal line is used for controlling the second transistor to be turned off. In different frames of the display, the first transistor and the second transistor are controlled to be alternately turned on and off to improve the ghost.

Description

Pixel circuit, driving method thereof and display panel

Technical Field

The present invention relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, and a display panel.

Background

In a display panel formed by low-temperature polysilicon technology, a pixel circuit provides a driving current required for display for a light emitting element of the display panel and controls whether the light emitting element enters a light emitting stage, so that the pixel circuit becomes an indispensable element in most self-luminous display panels. The pixel circuit comprises a driving module, and the driving module is used for generating driving current according to the voltage of the control end of the driving module to drive the light-emitting element to emit light.

However, in the conventional display panel, the hysteresis voltage of the transistor included in the driving module is large, and when the black-and-white screen of the display panel is switched to the gray-scale screen, the afterimage is easy to appear.

Disclosure of Invention

The invention provides a pixel circuit, a driving method thereof and a display panel, which are used for reducing the hysteresis voltage of a driving module and improving the afterimage.

According to an aspect of the present invention, there is provided a pixel circuit including: at least one switch module, a driving module and a light emitting module;

at least one switch module is electrically connected with the driving module, the at least one switch module comprises a first transistor and a second transistor which are connected in series, the grid electrode of the first transistor is electrically connected with a first control signal line, and the grid electrode of the second transistor is electrically connected with a second control signal line;

In the display process of the pixel circuit, the display device comprises at least one first display frame and at least one second display frame, wherein in the first display frame, in the stage of turning off the switch module, the first control signal line is used for controlling the first transistor to be turned off, and the second control signal line is used for controlling the second transistor to be turned on; in the second display frame, in the stage of turning off the switch module, the first control signal line is used for controlling the first transistor to be turned on, and the second control signal line is used for controlling the second transistor to be turned off;

the driving module is used for outputting driving current according to the voltage of the control end of the driving module and driving the light-emitting module to emit light.

Optionally, in the displaying process of the pixel circuit, part of the display frames are the first display frames, and the rest of the display frames are the second display frames.

Optionally, the displayed odd frame is the first display frame, and the displayed even frame is the second display frame.

Optionally, at least one of the switch modules includes a data writing module, the first control signal line includes a first scan line, the second control signal line includes a second scan line, the first transistor and the second transistor included in the data writing module are connected in series between the data line and the first end of the driving module, the gate of the first transistor included in the data writing module is electrically connected with the first scan line, and the gate of the second transistor included in the data writing module is electrically connected with the second scan line;

And in the stage of conducting the data writing module, the first scanning line is used for controlling the first transistor included in the data writing module to be conducted, and the second scanning line is used for controlling the second transistor included in the data writing module to be conducted so as to transmit the data voltage provided by the data line to the driving module.

Optionally, at least one of the switch modules includes a compensation module, the first control signal line includes a third scan line, the second control signal line includes a fourth scan line, a first transistor and a second transistor included in the compensation module are connected in series between a second end of the driving module and a control end of the driving module, a gate of the first transistor included in the compensation module is electrically connected with the third scan line, and a gate of the second transistor included in the compensation module is electrically connected with the fourth scan line;

and in the conducting stage of the compensation module, the third scanning line is used for controlling the first transistor included in the compensation module to be conducted, and the fourth scanning line is used for controlling the second transistor included in the compensation module to be conducted so as to transmit the data voltage containing the threshold voltage information of the driving module to the control end of the driving module.

Optionally, the pixel circuit further includes a storage module, a first light emitting control module, a second light emitting control module, a first initialization module and a second initialization module;

the storage module is electrically connected with the driving module and is used for storing data voltages;

the first light-emitting control module, the driving module, the second light-emitting control module and the light-emitting module are sequentially connected between a first power line and a second power line;

the first initialization module is electrically connected with the control end of the driving module and is used for transmitting initialization voltage to the control end of the driving module;

the second initialization module is electrically connected with the first end of the light emitting module, and the second initialization module is used for transmitting the initialization voltage to the first end of the light emitting module.

According to another aspect of the present invention, there is provided a driving method of a pixel circuit including at least one switching module, a driving module, and a light emitting module; at least one switch module is electrically connected with the driving module, the at least one switch module comprises a first transistor and a second transistor which are connected in series, the grid electrode of the first transistor is electrically connected with a first control signal line, and the grid electrode of the second transistor is electrically connected with a second control signal line; in the display process of the pixel circuit, at least one first display frame and at least one second display frame are included, and each frame in the display process comprises a light-emitting stage;

The driving method of the pixel circuit comprises the following steps:

in the first display frame, in the stage of turning off the switch module, the first control signal line controls the first transistor to be turned off, and the second control signal line controls the second transistor to be turned on;

in the second display frame, in the stage of turning off the switch module, the first control signal line controls the first transistor to be turned on, and the second control signal line controls the second transistor to be turned off;

in the light-emitting stage, the driving module outputs driving current according to the voltage of the control end of the driving module, and drives the light-emitting module to emit light.

Optionally, at least one of the switch modules includes a data writing module, the first control signal line includes a first scan line, the second control signal line includes a second scan line, the first transistor and the second transistor included in the data writing module are connected in series between the data line and the first end of the driving module, the gate of the first transistor included in the data writing module is electrically connected with the first scan line, and the gate of the second transistor included in the data writing module is electrically connected with the second scan line; the working process of the pixel circuit further comprises a data writing stage;

The driving method of the pixel circuit further includes:

in the data writing stage, the first scanning line controls a first transistor included in the data writing module to be conducted, and the second scanning line controls a second transistor included in the data writing module to be conducted so as to transmit a data voltage provided by the data line to the driving module;

in a first display frame, in a stage that the switch module is turned off, the first control signal line is used for controlling the first transistor to be turned off, and the second control signal line is used for controlling the second transistor to be turned on; in the second display frame, in a stage that the switch module is turned off, the first control signal line is used for controlling the first transistor to be turned on, and the second control signal line is used for controlling the second transistor to be turned off, including:

in the first display frame, in the non-data writing stage, the first scanning line controls a first transistor included in the data writing module to be turned off, and the second scanning line controls a second transistor included in the data writing module to be turned on;

in the second display frame, in the non-data writing stage, the first scanning line controls a first transistor included in the data writing module to be turned on, and the second scanning line controls a second transistor included in the data writing module to be turned off.

Optionally, at least one of the switch modules includes a compensation module, the first control signal line includes a third scan line, the second control signal line includes a fourth scan line, a first transistor and a second transistor included in the compensation module are connected in series between a second end of the driving module and a control end of the driving module, a gate of the first transistor included in the compensation module is electrically connected with the third scan line, and a gate of the second transistor included in the compensation module is electrically connected with the fourth scan line; the working process of the pixel circuit further comprises a compensation stage;

the driving method of the pixel circuit further includes:

in the compensation stage, the third scanning line controls a third transistor included in the compensation module to be conducted, and the fourth scanning line controls a fourth transistor included in the compensation module to be conducted so as to transmit a data voltage containing threshold voltage information of the driving module to a control end of the driving module;

in the first display frame, in the stage of turning off the switch module, the first control signal line is used for controlling the first transistor to be turned off, and the second control signal line is used for controlling the second transistor to be turned on; in the second display frame, in a stage that the switch module is turned off, the first control signal line is used for controlling the first transistor to be turned on, and the second control signal line is used for controlling the second transistor to be turned off, including:

In the first display frame, in the non-compensation stage, the third scanning line controls a first transistor included in the compensation module to be turned off, and the fourth scanning line controls a second transistor included in the compensation module to be turned on;

in the second display frame, in the non-compensation stage, the third scan line controls the first transistor included in the compensation module to be turned on, and the fourth scan line controls the second transistor included in the compensation module to be turned off.

According to another aspect of the present invention, there is provided a display panel including the pixel circuit described in any one of the above.

The pixel circuit provided by the invention comprises at least one switch module, a driving module and a light emitting module; the at least one switch module is electrically connected with the driving module and comprises a first transistor and a second transistor which are connected in series, wherein the grid electrode of the first transistor is electrically connected with a first control signal line, and the grid electrode of the second transistor is electrically connected with a second control signal line; in the display process of the pixel circuit, the display device comprises at least one first display frame and at least one second display frame, wherein in the first display frame, in the stage of turning off a switch module, a first control signal line is used for controlling a first transistor to be turned off, and a second control signal line is used for controlling a second transistor to be turned on; in the second display frame, in the stage of turning off the switch module, the first control signal line is used for controlling the first transistor to be turned on, and the second control signal line is used for controlling the second transistor to be turned off. In the stage of turning off the switch module, the embodiment controls the first transistor and the second transistor to be alternately turned on and off, so that the phenomenon that when a certain transistor is turned off for a long time, the bias of the transistor is large and the electric leakage is serious due to the fact that the grid potential is high is avoided. In different frames of display, the first transistor and the second transistor are alternately turned on and off, so that the time that the grid electrode of the transistor is in a high level for a long time can be reduced, the bias of the transistor is reduced, the electric leakage of the transistor is further reduced, the stability of the potential of the control end of the driving module is favorably maintained, the hysteresis voltage of the driving module is reduced, and the ghost image is improved.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a pixel circuit;

fig. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of another pixel circuit according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of another pixel circuit according to an embodiment of the present invention;

FIG. 5 is a timing diagram of driving a pixel circuit in an odd frame according to an embodiment of the present invention;

FIG. 6 is a timing diagram of driving a pixel circuit in an even frame according to an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of another pixel circuit according to an embodiment of the present invention;

FIG. 9 is a timing diagram of driving a pixel circuit in an odd frame according to another embodiment of the present invention;

FIG. 10 is a timing diagram of driving a pixel circuit in an even frame according to another embodiment of the present invention;

FIG. 11 is a schematic diagram of another pixel circuit according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;

fig. 13 is a flowchart of a driving method of a pixel circuit according to an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As mentioned in the background art, fig. 1 is a schematic structural diagram of a pixel circuit, referring to fig. 1, the pixel circuit includes a first transistor T1, a driving transistor T0 and a second transistor T2, wherein the first transistor T1 is connected between a data line and a first pole of the driving transistor T0, the second transistor T2 is connected between a second pole and a gate of the driving transistor T0, a gate of the first transistor T1 is connected with a first control signal line S1, and a gate of the second transistor T2 is connected with a second control signal line S2. It is to be noted that only a partial structural view of the pixel circuit is schematically shown in fig. 1. The first transistor T1, the second transistor T2 and the driving transistor T0 are P-type transistors. The first transistor T1 is turned off when the signal of the gate access of the first transistor T1 is at a high level, and the second transistor T2 is turned off when the signal of the gate access of the second transistor T1 is at a high level. In a frame of display, the first transistor T1 and the second transistor T2 are in an off state most of the time, i.e., the gate is connected to a high level for a long time, so that the bias of the first transistor T1 and the second transistor T2 is larger, the electric leakage is serious, and further, the voltage fluctuation of the first electrode and the gate of the driving transistor T0 is larger, i.e., the image sticking is easy to occur during the switching of the driving image.

In view of the above problems, an embodiment of the present invention provides a pixel circuit, and fig. 2 is a schematic structural diagram of the pixel circuit provided in the embodiment of the present invention, and referring to fig. 2, the pixel circuit includes: at least one switching module 10, a driving module 11 and a light emitting module 12;

at least one switching module 10 is electrically connected with the driving module 11, the at least one switching module 10 includes a first transistor T1 and a second transistor T2 connected in series, a gate of the first transistor T1 is electrically connected with the first control signal line S1, and a gate of the second transistor T2 is electrically connected with the second control signal line S2;

in the display process of the pixel circuit, the display device comprises at least one first display frame and at least one second display frame, in the first display frame, in the stage of turning off the switch module 10, the first control signal line S1 is used for controlling the first transistor T1 to be turned off, and the second control signal line S2 is used for controlling the second transistor T2 to be turned on; in the second display frame, in the stage of turning off the switch module 10, the first control signal line S1 is used for controlling the first transistor T1 to be turned on, and the second control signal line S2 is used for controlling the second transistor T2 to be turned off;

the driving module 11 is configured to output a driving current according to a voltage of its own control terminal, and drive the light emitting module 12 to emit light. For example, the switch module 10 in this embodiment may include a data writing module electrically connected to the control terminal of the driving module 11, where the data writing module is used to transmit a data voltage to the driving module. Optionally, the pixel circuit further includes a storage module 15, where the storage module 15 is electrically connected to the driving module 11 and is used for storing data voltages, and the driving module 11 and the light emitting module 12 are sequentially connected between the first power line Vdd and the second power line Vss. The present embodiment exemplarily shows that the second transistor T2 and the first transistor T1 are sequentially connected in series between the data line Vdata and the first terminal of the driving module 11. In other embodiments, the connection relationship of the pixel circuit may be that the first transistor T1 and the second transistor T2 are sequentially connected in series between the data line Vdata and the first end of the driving module 11, which is not limited in this embodiment. Optionally, the first transistor T1 and the second transistor T2 are P-type transistors. The pixel circuit includes a plurality of display frames in the display process, the plurality of display frames at least include a first display frame and at least a second display frame, in the first display frame, in the stage that the data writing module is turned off, the first control signal line S1 controls the first transistor T1 to be turned off, the second control signal line S2 controls the second transistor T2 to be turned on, and as the first transistor T1 is turned off, the connection between the data line Vdata and the driving module 11 is disconnected, and the transmission of the data voltage is turned off. In the second display frame, at the stage of turning off the data writing module, the first control signal line S1 controls the first transistor T1 to be turned on, the second control signal line S2 controls the second transistor T2 to be turned off, and the connection between the data line Vdata and the driving module 11 is disconnected due to the turn-off of the second transistor T2, so that the transmission of the data voltage is turned off. In the stage where the switch module 10 is turned off in one frame, two transistors included in the switch module 10 are controlled to be turned on one and turned off the other, and at the same time, in the stage where at least two different frames of the switch module 10 are turned off, the same transistor is alternately turned on and off. The display process of the pixel circuit includes 20 frames, including 5 frames of first display frames and 5 frames of second display frames, wherein the first display frames control the first transistor T1 to be turned off and the second transistor T2 to be turned on, and the second display frames control the first transistor T1 to be turned on and the second transistor T2 to be turned off. In the remaining 10 frames except the first display frame and the second display frame, the first transistor T1 and the second transistor T2 may be controlled to be turned off at a stage where the switching module 10 is turned off. Compared with the switching-off of the switching module 10 in all frames, the switching-on and switching-off of the same transistor included in the switching module 10 in different frames can reduce the time of switching in the high level by the gate of the transistor, and further reduce the bias of the first transistor or the second transistor. After the bias of the first transistor T1 or the second transistor T2 is reduced, the leakage capability is reduced, so that self leakage can be reduced, thereby being beneficial to maintaining the stability of the potential of the first end of the driving module 11 and reducing the hysteresis voltage of the driving module.

In the light emitting stage, the driving module 11 generates a driving current according to the data voltage and the first power voltage supplied by the first power line Vdd, and drives the light emitting module 12 to emit light.

The pixel circuit is not limited to one structure shown in fig. 2, fig. 3 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention, and referring to fig. 3, optionally, the pixel circuit further includes a first light emitting control module 13, a second light emitting control module 14, and a compensation module 10-2, where the first light emitting control module 13, the driving module 11, the second light emitting control module 14, and the light emitting module 12 are sequentially connected between a first power line Vdd and a second power line Vss. The data writing module 10-1 is electrically connected to the first end of the driving module 11, and the compensation module 10-2 is connected between the second end of the driving module 11 and the control end of the driving module 11. The switching module in the pixel circuit is a module that performs a switching function, and may include a plurality of switching modules, and may be connected to the driving module 11, and transmit a corresponding voltage to the driving module 11, so as to control the driving module 11 to generate a required driving signal, for example, generate a required driving current to drive the light emitting module 12 to emit light. The switching module may be one or more of a data writing module 10-1 transmitting a data voltage, a compensation module 10-2 compensating a threshold voltage of the driving module 11, which are well known to those skilled in the art. The switching module may be turned on or off in response to a signal on the control signal line to control transmission or off transmission of the signal. In the stage of switching off the switch module, namely, the stage of not needing to carry out signal transmission, the switch module responds to the signal on the control signal line to switch off one of the two transistors. In the structure shown in fig. 3, the exemplary switch module includes only the data writing module 10-1.

In the stage of turning off the switch module, the embodiment controls the first transistor and the second transistor to be alternately turned on and off, so that the phenomenon that when a certain transistor is turned off for a long time, the bias of the transistor is large and the electric leakage is serious due to the fact that the grid potential is high is avoided. In different frames, the first transistor and the second transistor are alternately turned on and off, so that the time that the grid electrode of the transistor is in a high level for a long time can be reduced, the bias of the transistor is reduced, the electric leakage of the transistor is further reduced, the stability of the potential of the driving module is maintained, the hysteresis voltage of the driving module is reduced, and the ghost shadow is improved.

With continued reference to fig. 2, optionally, during display of the pixel circuit, a portion of the display frames are first display frames and the remaining display frames are second display frames.

The display process of the pixel circuit includes 20 frames, and may include 8 frames of the first display frame and 12 frames of the second display frame, which may be specifically set according to the user requirement, and this embodiment will not be described herein. Compared with the switching module 10 of the partial frame being displayed in the off stage, the transistors included in the switching module 10 are turned off, in this embodiment, in each frame being displayed, in the off stage of the switching module 10, one of the two transistors included in the switching module 10 is turned on and the other is turned off, because the grid of the turned-on transistor is connected with the low level, the time for connecting the grid of the transistor with the high level can be reduced, the bias of the transistor can be reduced, the leakage of the transistor can be reduced, the stability of the potential of the driving module can be maintained, the hysteresis voltage of the driving module can be reduced, and the ghost image can be improved

With continued reference to fig. 2, optionally, the displayed odd frames are first display frames and the displayed even frames are second display frames.

In contrast, in the stage of turning off the switch module 10 of each frame, the first transistor T1 and the second transistor T2 are turned off, and in this embodiment, the turn-off time of the first transistor T1 or the second transistor T2 is reduced by half, so that the bias of the first transistor T1 or the second transistor T2 can be reduced, the leakage current of the first transistor T1 or the second transistor T2 can be reduced, the magnitude of the hysteresis voltage of the driving module 11 can be reduced, and the ghost image can be improved.

Fig. 4 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention, referring to fig. 4, optionally, at least one switch module includes a data writing module 10-1, a first control signal line includes a first scan line S1-1, a second control signal line includes a second scan line S2-1, a first transistor T1-1 and a second transistor T2-1 included in the data writing module 10-1 are connected in series between a data line Vdata and a first end of a driving module 11, a gate of the first transistor T1-1 included in the data writing module 10-1 is electrically connected to the first scan line S1-1, and a gate of the second transistor T2-1 included in the data writing module 10-1 is electrically connected to the second scan line S2-1;

In the stage of turning on the data writing module 10-1, the first scan line S1-1 is used for controlling the first transistor T1-1 included in the data writing module 10-1 to be turned on, and the second scan line S2-1 is used for controlling the second transistor T2-1 included in the data writing module 10-1 to be turned on, so as to transmit the data voltage provided by the data line Vdata to the driving module 11.

Optionally, the pixel circuit further comprises a first initialization module 16, a second initialization module 17 and a compensation module 10-2. The first initialization module 16 is electrically connected with the control end of the driving module 11, and the first initialization module 16 is used for transmitting an initialization voltage to the control end of the driving module 11;

the second initializing module 17 is electrically connected to the first end of the light emitting module 12, and the second initializing module 17 is configured to transmit an initializing voltage to the first end of the light emitting module 12.

The first initialization module 16 is connected between the initialization signal line Vref and the control terminal of the driving module 11, and the control terminal of the first initialization module 16 is electrically connected to the fifth scan line S5, and is used for being turned on or off in response to a signal on the fifth scan line S5. The second initialization module 17 is connected between the initialization signal line Vref and the first end of the light emitting module 12, and the control end of the second initialization module 17 is electrically connected to the sixth scan line S6, and is used for being turned on or off in response to a signal on the sixth scan line S6. The control end of the first light emitting control module 13 is electrically connected to the light emitting control signal line EM for being turned on or off in response to a signal on the light emitting control signal line EM. The control end of the second light-emitting control module 14 is electrically connected to the light-emitting control signal line EM, and is used for being turned on or off in response to a signal on the light-emitting control signal line EM. The control terminal of the compensation module 10-2 is electrically connected to the seventh scan line S7, and is configured to be turned on or off in response to a signal on the seventh scan line S7.

In one frame of display, the working process of the pixel circuit includes an initialization stage t1, a data writing stage t2, a compensation stage and a light emitting stage t3, wherein the data writing stage and the compensation stage are the same stage, that is, the writing of the data voltage and the compensation of the threshold voltage are performed in the same stage. In this embodiment, the displayed odd frame is taken as a first display frame, and the displayed even frame is taken as a second display frame as an example. Fig. 5 is a driving timing chart of a pixel circuit in an odd frame according to an embodiment of the present invention, and fig. 6 is a driving timing chart of a pixel circuit in an even frame according to an embodiment of the present invention, wherein a signal on the second scan line S2-1 in fig. 5 is at a low level, and a signal on the first scan line S1-1 in fig. 6 is at a low level. Referring to fig. 4 to 6, in an odd frame, in an initialization phase T1, a first scan line S1-1 controls a first transistor T1-1 included in a data writing module 10-1 to be turned off. The seventh scan line S7 controls the compensation module 10-2 to be turned off, and the emission control signal line EM controls the first and second emission control modules 13 and 14 to be turned off. The second scan line S2-1 controls the second transistor T2-1 included in the data writing module 10-1 to be turned on. The fifth scan line S5 controls the first initialization module 16 to be turned on, so as to transmit the initialization voltage provided by the initialization signal line Vref to the control terminal of the driving module 11. The sixth scan line S6 controls the second initialization module 17 to be turned on to transmit the initialization voltage provided by the initialization signal line Vref to the first terminal of the light emitting module 12. In this embodiment, the signals on the fifth scan line S5 and the sixth scan line S6 are the same, and in other embodiments, the signals on the fifth scan line S5 and the sixth scan line S6 may be different, so as to control the first initialization module 16 and the second initialization module 17 to be turned on at different stages.

In the data writing stage t2, the light emission control signal line EM controls the first and second light emission control modules 13 and 14 to be turned off. The fifth scan line S5 controls the first initialization module 16 to be turned off. The sixth scan line S6 controls the second initialization module 17 to be turned off. The first scan line S1-1 controls the first transistor T1-1 included in the data writing module 10-1 to be turned on, the second scan line S2-1 controls the second transistor T2-1 included in the data writing module 10-1 to be turned on, and the data voltage is transmitted to the first end of the driving module 11 through the turned-on data writing module 10-1. The seventh scan line S7 controls the compensation module 10-2 to be turned on, so as to transmit the data voltage containing the threshold voltage information of the driving module 11 to the control end of the driving module 11, thereby implementing the compensation of the threshold voltage of the driving module 11. In the non-data writing stage, that is, the stage except the data writing stage is the stage of turning off the data writing module 10-1, the first scanning line S1-1 controls the first transistor T1-1 included in the data writing module 10-1 to be turned off, and the second scanning line S2-1 controls the second transistor T2-1 included in the data writing module 10-1 to be turned on, so that the time for the second transistor T2-1 included in the data writing module 10-1 to be connected to the high level is reduced, the bias of the transistor is reduced, the electric leakage of the data writing module 10-1 is further reduced, the voltage fluctuation at the first end of the driving module 11 is reduced, the hysteresis voltage of the driving module 11 is reduced, and the improvement of the ghost is further facilitated.

In the light emitting period T3, the first scan line S1-1 controls the first transistor T1-1 included in the data writing module 10-1 to be turned off. The seventh scan line S7 controls the compensation module 10-2 to be turned off. The fifth scan line S5 controls the first initialization module 16 to be turned off. The sixth scan line S6 controls the second initialization module 17 to be turned off. The second scan line S2-1 controls the second transistor T2-1 included in the data writing module 10-1 to be turned on. The light emission control signal line EM controls the first light emission control module 13 and the second light emission control module 14 to be turned on, the turned-on first light emission control module 13 transmits a first power voltage provided by the first power line Vdd to a first end of the driving module 11, and the driving module 11 generates a driving current according to voltages of its own control end and the first end to drive the light emitting module 12 to emit light.

In the even frame displayed by the pixel circuit, in the stages other than the data writing stage T1, the first scan line S1-1 controls the first transistor T1-1 included in the data writing module 10-1 to be turned on, the second scan line S2-1 controls the second transistor T2-1 included in the data writing module 10-1 to be turned off, and the processes of the other modules in each stage are the same as those of the odd frame, which is not repeated here.

In this embodiment, a specific structure of a pixel circuit is further provided, fig. 7 is a schematic structural diagram of another pixel circuit provided in this embodiment, fig. 7 corresponds to one specific pixel circuit shown in fig. 4, and referring to fig. 4 and 7, optionally, the storage module 15 includes a storage capacitor Cst, the driving module 11 includes a third transistor T3, the compensation module 10-2 includes a fourth transistor T4, the first light emitting control module 13 includes a fifth transistor T5, the second light emitting control module 14 includes a sixth transistor T6, the first initialization module 16 includes a first sub-transistor T7-1 and a second sub-transistor T7-2, the second initialization module 17 includes an eighth transistor T8, and the transistors included in the first initialization module 16 are dual-gate transistors. A first pole of the fifth transistor T5 is electrically connected to the first power supply line Vddd, a second pole of the fifth transistor T5 is electrically connected to a first pole of the third transistor T3, and a gate of the fifth transistor T5 is electrically connected to the emission control signal line EM. The first pole of the third transistor T3 is also electrically connected to the second pole of the second transistor T2-1 included in the data writing module 10-1, the second pole of the third transistor T3 is electrically connected to the first pole of the sixth transistor T6, the second pole of the sixth transistor T6 is electrically connected to the first end of the light emitting module 12, and the gate of the sixth transistor T6 is electrically connected to the light emission control signal line EM. The first pole of the fourth transistor T4 is electrically connected to the second pole of the third transistor T3, the second pole of the fourth transistor T4 is electrically connected to the gate of the third transistor T3, and the gate of the fourth transistor T4 is electrically connected to the seventh scan line S7. The first pole of the first sub-transistor T7-1 is electrically connected to the initialization signal line Vref, the second pole of the first sub-transistor T7-1 is electrically connected to the first pole of the second sub-transistor T7-2, the second pole of the second sub-transistor T7-2 is connected to the gate of the third transistor T3, and the gates of the first sub-transistor T7-1 and the second sub-transistor T7-2 are electrically connected to the fifth scan line S5. The first electrode of the eighth transistor T8 is electrically connected to the initialization signal line Vref, the second electrode of the eighth transistor T8 is electrically connected to the first end of the light emitting module 12, and the gate electrode of the eighth transistor T8 is electrically connected to the sixth scan line S6. The transistors included in the pixel circuit shown in fig. 7 are P-type transistors, the driving timing sequence can refer to fig. 5 and 6, and the operation process of the pixel circuit shown in fig. 7 is the same as that of the pixel circuit shown in fig. 4, and will not be described again here.

Fig. 8 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention, referring to fig. 8, optionally, at least one switch module includes a compensation module 10-2, a first control signal line includes a third scan line S1-2, a second control signal line includes a fourth scan line S2-2, a first transistor T1-2 and a second transistor T2-2 included in the compensation module 10-2 are connected in series between a second end of the driving module 11 and a control end of the driving module 11, a gate of the first transistor T1-2 included in the compensation module 10-2 is electrically connected with the third scan line S1-2, and a gate of the second transistor T2-2 included in the compensation module 10-2 is electrically connected with the fourth scan line S2-2;

in the conducting phase of the compensation module, the third scan line S1-2 is used for controlling the first transistor T1-2 included in the compensation module 10-2 to be conducted, and the fourth scan line S2-2 is used for controlling the second transistor T2-2 included in the compensation module 10-2 to be conducted, so as to transmit the data voltage containing the threshold voltage information of the driving module 11 to the control terminal of the driving module 11.

In this embodiment, the first transistor T1-2 and the second transistor T2-2 included in the compensation module 10-2 are sequentially connected in series between the second terminal and the control terminal of the driving module 11, and in other embodiments, the pixel circuit may also be configured such that the second transistor T2-2 and the first transistor T1-2 included in the compensation module 10-2 are sequentially connected in series between the second terminal and the control terminal of the driving module 11. The data writing module 10-2 may include only one transistor, and the control terminal of the data writing module 10-2 is connected to the eighth scan line S8.

Fig. 9 is a driving timing chart of another pixel circuit in an odd frame according to an embodiment of the present invention, and fig. 10 is a driving timing chart of another pixel circuit in an even frame according to an embodiment of the present invention. Referring to fig. 8 to 10, the data writing module 10-1 is turned on in response to a signal on the eighth scan line S8 in the data writing phase, and is turned off in the non-data writing phase, i.e., in phases other than the data writing phase, regardless of whether it is an odd frame or an even frame. In the non-compensation phase of the odd frame, i.e., the phase other than the compensation phase, i.e., the phase in which the compensation module 10-2 is turned off, the third scan line S1-2 is used to control the first transistor T1-2 included in the compensation module 10-2 to be turned off, and the fourth scan line S2-2 is used to control the second transistor T2-2 included in the compensation module 10-2 to be turned on. In the even frame shown, during the non-compensation phase, the third scan line S1-2 is used to control the first transistor T1-2 included in the compensation module 10-2 to be turned on, and the fourth scan line S2-2 is used to control the second transistor T2-2 included in the compensation module 10-2 to be turned off. In this embodiment, the first transistor T1-2 and the second transistor T2-2 included in the compensation module 10-2 are alternately turned on in the non-compensation stage of different frames, so that the gate of a certain transistor is prevented from being connected to a high level for a long time, the time for the transistor included in the compensation module 10-2 to be connected to the high level is reduced, the bias of the transistor is reduced, the leakage of the compensation module 10-2 is further reduced, the fluctuation of the voltage at the control end of the driving module 11 is reduced, the magnitude of the hysteresis voltage of the driving module 11 is further reduced, and improvement of the ghost is facilitated. Except for the above operation, the operation of the pixel circuit shown in fig. 8 is the same as that of the pixel circuit shown in fig. 4, and will not be described here again.

Fig. 11 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention, and fig. 11 corresponds to a specific structure of the pixel circuit shown in fig. 8. The circuit shown in fig. 11 is different from that of fig. 7 in that the data writing module includes a ninth transistor T9, the ninth transistor T9 is connected between the data line Vdata and the first pole of the third transistor T3, and the gate of the ninth transistor T9 is connected to the eighth scan line S8. The compensation module comprises a first transistor T1-2 and a second transistor T2-2, the first transistor T1-2 and the second transistor T2-2 which are sequentially connected in series between a second pole of a third transistor T3 and a grid electrode of the third transistor T3, the grid electrode of the first transistor T1-2 which is included in the compensation module is electrically connected with a third scanning line S1-2, and the grid electrode of the second transistor T2-2 which is included in the compensation module is electrically connected with a fourth scanning line S2-2. The driving sequence of the pixel circuit shown in fig. 11 can refer to fig. 9 and 10, and the operation process is the same as that of fig. 8, and will not be repeated here.

Fig. 12 is a schematic diagram of another pixel circuit according to an embodiment of the present invention, and referring to fig. 12, an optional switch module includes a data writing module 10-1 and a compensation module 10-2. The data writing module 10-1 includes a first transistor T1-1 and a second transistor T2-1, and the compensation module 10-2 includes a first transistor T1-2 and a second transistor T2-2. In this embodiment, the first transistor T1-1 and the second transistor T2-1 included in the data writing module 10-1 are alternately turned on at the stage of turning off the data writing module 10-1 in different frames, so that the time for the transistors included in the data writing module 10-1 to access to the high level can be reduced, the bias of the transistors can be reduced, the leakage of the data writing module 10-1 can be further reduced, and the voltage fluctuation at the first end of the driving module 11 can be reduced. The first transistor T1-2 and the second transistor T2-2 included in the compensation module 10-2 are alternately turned on in the off phase of the compensation module 10-2 of different frames, so that the time for switching in the transistor included in the compensation module 10-2 to the high level can be reduced, and the voltage fluctuation of the control terminal of the driving module 11 can be reduced. The hysteresis voltage of the driving module 11 is reduced by reducing the voltage fluctuation of the first end and the control end of the driving module 11, so that the afterimage during display is further improved.

The embodiment of the invention also provides a driving method of the pixel circuit, and the pixel circuit driven by the method comprises at least one switch module, a driving module and a light emitting module; the at least one switch module is electrically connected with the driving module and comprises a first transistor and a second transistor which are connected in series, wherein the grid electrode of the first transistor is electrically connected with a first control signal line, and the grid electrode of the second transistor is electrically connected with a second control signal line; in the display process of the pixel circuit, at least one first display frame and at least one second display frame are included, and each frame in the display process comprises a light-emitting stage; fig. 13 is a flowchart of a driving method of a pixel circuit according to an embodiment of the present invention, and referring to fig. 13, the method includes:

s10: in the first display frame, in the stage of turning off the switch module, the first control signal line controls the first transistor to be turned off, and the second control signal line controls the second transistor to be turned on.

Because the first transistor and the second transistor included in the switch module are connected in series, one of the transistors is turned off, so that the switch module can be turned off. And in the first display frame, the second transistor is controlled to be always on, and when the second transistor is a p-type transistor, the grid electrode is connected with a low level when the second transistor is on, so that the time of connecting the grid electrode with a high level is reduced, the bias of the second transistor is reduced, the leakage of the second transistor is reduced, and the hysteresis voltage of the driving module is further reduced.

S20: in the second display frame, in the stage of turning off the switch module, the first control signal line controls the first transistor to be turned on, and the second control signal line controls the second transistor to be turned off.

In the second display frame, the first transistor is controlled to be always on, and when the first transistor is a p-type transistor, the grid electrode is connected with a low level when the first transistor is on, so that the time of connecting the grid electrode with a high level is reduced, the bias of the first transistor is reduced, the electric leakage of the first transistor is reduced, and the hysteresis voltage of the driving module is further reduced.

S30: in the light-emitting stage, the driving module outputs driving current according to the voltage of the control end of the driving module, and drives the light-emitting module to emit light.

The driving method of the pixel circuit has the same advantages as those of the pixel circuit, and will not be described here again.

Optionally, the at least one switch module includes a data writing module, the first control signal line includes a first scan line, the second control signal line includes a second scan line, the first transistor and the second transistor included in the data writing module are connected in series between the data line and the first end of the driving module, the gate of the first transistor included in the data writing module is electrically connected with the first scan line, and the gate of the second transistor included in the data writing module is electrically connected with the second scan line; the working process of the pixel circuit also comprises a data writing stage;

Optionally, the driving method of the pixel circuit includes:

in the data writing stage, the first scanning line controls the first transistor included in the data writing module to be conducted, and the second scanning line controls the second transistor included in the data writing module to be conducted so as to transmit the data voltage provided by the data line to the driving module.

Specifically, in the data writing stage, the data writing module is controlled to be conducted, and the conducted data writing module transmits the data voltage to the first end of the driving module to complete writing of the data voltage.

In the first display frame, in the non-data writing stage, the first scanning line controls the first transistor included in the data writing module to be turned off, and the second scanning line controls the second transistor included in the data writing module to be turned on.

Specifically, in one frame, the phases except the data writing phase are all non-data writing phases, and the non-data writing phases need to control the data writing module to be turned off. In the first display frame, the first scanning line controls the first transistor included in the data writing module to be turned off so as to turn off the data writing module.

In the second display frame, in the non-data writing stage, a first transistor included in the first scanning line control data writing module is turned on, and a second transistor included in the second scanning line control data writing module is turned off.

Specifically, in the second display frame, the second scan line controls the second transistor included in the data writing module to be turned off so as to turn off the data writing module.

In the light-emitting stage, the driving module outputs driving current according to the voltage of the control end of the driving module, and drives the light-emitting module to emit light.

Optionally, the at least one switching module includes a compensation module, the first control signal line includes a third scan line, the second control signal line includes a fourth scan line, the compensation module includes a first transistor and a second transistor connected in series between the second end of the driving module and the control end of the driving module, the compensation module includes a gate of the first transistor electrically connected to the third scan line, and the compensation module includes a gate of the second transistor electrically connected to the fourth scan line; the working process of the pixel circuit also comprises a compensation phase;

optionally, the driving method of the pixel circuit includes:

in the compensation stage, a third transistor included in the third scan line control compensation module is turned on, and a fourth transistor included in the fourth scan line control compensation module is turned on, so as to transmit a data voltage containing threshold voltage information of the driving module to a control end of the driving module.

Specifically, in the compensation stage, the compensation module is controlled to be conducted, and the conducted compensation module transmits the data voltage containing the threshold voltage information of the driving module to the control end of the driving module.

In the first display frame, in the non-compensation stage, the first transistor included in the third scan line control compensation module is turned off, and the second transistor included in the fourth scan line control compensation module is turned on.

Specifically, in one frame, the phases except the compensation phase are non-compensation phases, and the non-compensation phases need to control the compensation module to be turned off. In the first display frame, the third scanning line controls the first transistor included in the compensation module to be turned off so as to realize the turn-off of the compensation module.

In the second display frame, in the non-compensation stage, the first transistor included in the third scan line control compensation module is turned on, and the second transistor included in the fourth scan line control compensation module is turned off.

Specifically, in the second display frame, the fourth scan line controls the second transistor included in the compensation module to be turned off so as to realize the turn-off of the compensation module.

In the light-emitting stage, the driving module outputs driving current according to the voltage of the control end of the driving module, and drives the light-emitting module to emit light.

The embodiment of the invention also provides a display panel which comprises the pixel circuit, and the display panel has the same beneficial effects as the pixel circuit and is not repeated herein.

It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.

The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. A pixel circuit, comprising: at least one switch module, a driving module and a light emitting module;

at least one switch module is electrically connected with the driving module, the at least one switch module comprises a first transistor and a second transistor which are connected in series, the grid electrode of the first transistor is electrically connected with a first control signal line, and the grid electrode of the second transistor is electrically connected with a second control signal line;

In the display process of the pixel circuit, the display device comprises at least one first display frame and at least one second display frame, wherein in the first display frame, in the stage of turning off the switch module, the first control signal line is used for controlling the first transistor to be turned off, and the second control signal line is used for controlling the second transistor to be turned on; in the second display frame, in the stage of turning off the switch module, the first control signal line is used for controlling the first transistor to be turned on, and the second control signal line is used for controlling the second transistor to be turned off;

the driving module is used for outputting driving current according to the voltage of the control end of the driving module and driving the light-emitting module to emit light.

2. The pixel circuit of claim 1, wherein during display of the pixel circuit, a portion of display frames are the first display frames and the remaining display frames are the second display frames.

3. The pixel circuit of claim 1, wherein the displayed odd frame is the first display frame and the displayed even frame is the second display frame.

4. A pixel circuit according to any one of claims 1-3, wherein at least one of the switch modules comprises a data writing module, the first control signal line comprises a first scan line, the second control signal line comprises a second scan line, the data writing module comprises a first transistor and a second transistor connected in series between a data line and a first end of the driving module, a gate of the first transistor of the data writing module is electrically connected to the first scan line, and a gate of the second transistor of the data writing module is electrically connected to the second scan line;

And in the stage of conducting the data writing module, the first scanning line is used for controlling the first transistor included in the data writing module to be conducted, and the second scanning line is used for controlling the second transistor included in the data writing module to be conducted so as to transmit the data voltage provided by the data line to the driving module.

5. A pixel circuit according to any one of claims 1-3, wherein at least one of the switching modules comprises a compensation module, the first control signal line comprises a third scan line, the second control signal line comprises a fourth scan line, the compensation module comprises a first transistor and a second transistor connected in series between the second terminal of the driving module and the control terminal of the driving module, the compensation module comprises a gate of the first transistor electrically connected to the third scan line, and the compensation module comprises a gate of the second transistor electrically connected to the fourth scan line;

and in the conducting stage of the compensation module, the third scanning line is used for controlling the first transistor included in the compensation module to be conducted, and the fourth scanning line is used for controlling the second transistor included in the compensation module to be conducted so as to transmit the data voltage containing the threshold voltage information of the driving module to the control end of the driving module.

6. The pixel circuit of claim 1, further comprising: the device comprises a storage module, a first light-emitting control module, a second light-emitting control module, a first initialization module and a second initialization module;

the storage module is electrically connected with the driving module and is used for storing data voltages;

the first light-emitting control module, the driving module, the second light-emitting control module and the light-emitting module are sequentially connected between a first power line and a second power line;

the first initialization module is electrically connected with the control end of the driving module and is used for transmitting initialization voltage to the control end of the driving module;

the second initialization module is electrically connected with the first end of the light emitting module, the second initialization module is used for transmitting the initialization voltage to the first end of the light emitting module.

7. A driving method of a pixel circuit, wherein the pixel circuit comprises at least one switch module, a driving module and a light emitting module; at least one switch module is electrically connected with the driving module, the at least one switch module comprises a first transistor and a second transistor which are connected in series, the grid electrode of the first transistor is electrically connected with a first control signal line, and the grid electrode of the second transistor is electrically connected with a second control signal line; in the display process of the pixel circuit, at least one first display frame and at least one second display frame are included, and each frame in the display process comprises a light-emitting stage;

The driving method of the pixel circuit comprises the following steps:

in the first display frame, in the stage of turning off the switch module, the first control signal line controls the first transistor to be turned off, and the second control signal line controls the second transistor to be turned on;

in the second display frame, in the stage of turning off the switch module, the first control signal line controls the first transistor to be turned on, and the second control signal line controls the second transistor to be turned off;

in the light-emitting stage, the driving module outputs driving current according to the voltage of the control end of the driving module, and drives the light-emitting module to emit light.

8. The driving method according to claim 7, wherein at least one of the switching modules includes a data writing module, the first control signal line includes a first scan line, the second control signal line includes a second scan line, the data writing module includes a first transistor and a second transistor connected in series between a data line and a first end of the driving module, a gate of the first transistor included in the data writing module is electrically connected to the first scan line, and a gate of the second transistor included in the data writing module is electrically connected to the second scan line; the working process of the pixel circuit further comprises a data writing stage;

The driving method of the pixel circuit further includes:

in the data writing stage, the first scanning line controls a first transistor included in the data writing module to be conducted, and the second scanning line controls a second transistor included in the data writing module to be conducted so as to transmit a data voltage provided by the data line to the driving module;

in a first display frame, in a stage that the switch module is turned off, the first control signal line is used for controlling the first transistor to be turned off, and the second control signal line is used for controlling the second transistor to be turned on; in the second display frame, in a stage that the switch module is turned off, the first control signal line is used for controlling the first transistor to be turned on, and the second control signal line is used for controlling the second transistor to be turned off, including:

in the first display frame, in the non-data writing stage, the first scanning line controls a first transistor included in the data writing module to be turned off, and the second scanning line controls a second transistor included in the data writing module to be turned on;

in the second display frame, in the non-data writing stage, the first scanning line controls a first transistor included in the data writing module to be turned on, and the second scanning line controls a second transistor included in the data writing module to be turned off.

9. The driving method according to claim 7, wherein at least one of the switching modules includes a compensation module, the first control signal line includes a third scan line, the second control signal line includes a fourth scan line, the compensation module includes a first transistor and a second transistor connected in series between a second terminal of the driving module and a control terminal of the driving module, a gate of the first transistor included in the compensation module is electrically connected to the third scan line, and a gate of the second transistor included in the compensation module is electrically connected to the fourth scan line; the working process of the pixel circuit further comprises a compensation stage;

the driving method of the pixel circuit further includes:

in the compensation stage, the third scanning line controls a third transistor included in the compensation module to be conducted, and the fourth scanning line controls a fourth transistor included in the compensation module to be conducted so as to transmit a data voltage containing threshold voltage information of the driving module to a control end of the driving module;

in the first display frame, in the stage of turning off the switch module, the first control signal line is used for controlling the first transistor to be turned off, and the second control signal line is used for controlling the second transistor to be turned on; in the second display frame, in a stage that the switch module is turned off, the first control signal line is used for controlling the first transistor to be turned on, and the second control signal line is used for controlling the second transistor to be turned off, including:

In the first display frame, in the non-compensation stage, the third scanning line controls a first transistor included in the compensation module to be turned off, and the fourth scanning line controls a second transistor included in the compensation module to be turned on;

in the second display frame, in the non-compensation stage, the third scan line controls the first transistor included in the compensation module to be turned on, and the fourth scan line controls the second transistor included in the compensation module to be turned off.

10. A display panel comprising the pixel circuit of any one of claims 1-6.