Pixel circuit, driving method and display panel

Abstract

The present invention provides a pixel circuit, a driving method, and a display panel. The pixel circuit includes: a driving module, a control terminal of which is electrically connected to a first node and a first terminal of which is electrically connected to a first power supply voltage signal line; a coupling module, a first terminal of which is electrically connected to the first node; a first switch module, electrically connected to a first control signal line, a first voltage signal line, and a second terminal of the coupling module; a second switch module, electrically connected to a second control signal line, a second voltage signal line, and a second terminal of the coupling module; in a first phase, the first switch module is turned on to write a first voltage signal to the second terminal of the coupling module; in a second phase, the second switch module is turned on to write a second voltage signal to the second terminal of the coupling module, the second voltage signal being less than the voltage value of the first voltage signal, and the coupling module lowers the potential of the first node through coupling. The present invention enables the driving module to operate normally in a saturation region, ensuring that the pixel circuit can output a normal driving current.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and in particular relates to a pixel circuit, a driving method, and a display panel. Background Art

[0002] With the continuous development of display technology, the application scope of display panels is becoming more and more extensive, and people's requirements for display panels are also becoming higher and higher.

[0003] The pixel circuit in the display panel plays a very important role in driving the light-emitting element to emit light stably. The driving module in the pixel circuit usually needs to work under the drive of a first power supply voltage signal (such as a positive power supply voltage signal).

[0004] However, the inventors of the present application have discovered that when the voltage value of the first power supply voltage signal is low, the driving module in the pixel circuit cannot operate in the saturation region, thereby causing the pixel circuit to be unable to output the driving current normally. Summary of the Invention

[0005] The embodiments of the present application provide a pixel circuit, a driving method, and a display panel, which enable a driving module in the pixel circuit to operate normally in a saturation region, thereby enabling the pixel circuit to output a driving current normally.

[0006] In a first aspect, an embodiment of the present application provides a pixel circuit, which includes: a driving module, wherein the control end of the driving module is electrically connected to the first node, and the first end of the driving module is electrically connected to the first power supply voltage signal line; a coupling module, wherein the first end of the coupling module is electrically connected to the first node; a first switch module, wherein the control end of the first switch module is electrically connected to the first control signal line, the first end of the first switch module is electrically connected to the first voltage signal line, and the second end of the first switch module is electrically connected to the second end of the coupling module; a second switch module, wherein the control end of the second switch module is electrically connected to the second control signal line, the first end of the second switch module is electrically connected to the second voltage signal line, and the second end of the second switch module is electrically connected to the second end of the coupling module; in a first stage, the first switch module is turned on to write a first voltage signal to the second end of the coupling module; in a second stage, the second switch module is turned on to write a second voltage signal to the second end of the coupling module, wherein the voltage value of the second voltage signal is less than the voltage value of the first voltage signal, and the coupling module lowers the potential of the first node through coupling in response to the potential change of the second end of the coupling module.

[0007] According to the implementation of the first aspect of the present application, the first voltage signal line multiplexes the first power supply voltage signal line, and the first power supply voltage signal line provides a first power supply voltage signal with a positive voltage value; in the first stage, the first switch module is turned on and the first power supply voltage signal is written to the second end of the coupling module.

[0008] In this way, the first voltage signal line reuses the first power supply voltage signal line, which can reduce the number of signal lines in the display panel, save wiring space, and reduce production costs.

[0009] According to any of the aforementioned embodiments of the first aspect of the present application, the voltage value of the first power supply voltage signal is less than 10V.

[0010] In this way, by reducing the voltage value of the first power supply voltage signal, the overall power consumption can be reduced.

[0011] According to any of the aforementioned embodiments of the first aspect of the present application, the pixel circuit further includes: a storage module, a first end of the storage module is electrically connected to the first node, a second end of the storage module is electrically connected to the first electrode of the light-emitting element, and the first electrode of the light-emitting element is directly or indirectly electrically connected to the second end of the driving module; in the light-emitting stage after the second stage, the storage module responds to the potential change of the first electrode of the light-emitting element and adjusts the potential of the first node through coupling.

[0012] Thus, during the light-emitting phase, the coupling of the storage module can ensure that the potential change trend of the control terminal of the driver module is consistent with the potential change trend of the second terminal of the driver module, so that the difference between the potential of the control terminal of the driver module and the potential of the second terminal of the driver module (i.e., the gate-source voltage Vgs) remains constant. Because the drive current is related to the gate-source voltage Vgs, when the gate-source voltage Vgs remains constant, the drive current of the pixel circuit can be kept constant, thereby ensuring the stability and uniformity of the brightness of the light-emitting element.

[0013] According to any of the aforementioned embodiments of the first aspect of the present application, the storage module includes a storage capacitor, a first plate of the storage capacitor is electrically connected to the first node, and a second plate of the storage capacitor is electrically connected to the first electrode of the light-emitting element.

[0014] According to any of the aforementioned embodiments of the first aspect of the present application, the pixel circuit also includes: a first light-emitting control module, the control end of the first light-emitting control module is electrically connected to the first light-emitting control signal line, the first end of the first light-emitting control module is electrically connected to the first power supply voltage signal line, and the second end of the first light-emitting control module is electrically connected to the first end of the driving module; a second light-emitting control module, the control end of the second light-emitting control module is electrically connected to the first light-emitting control signal line, the first end of the second light-emitting control module is electrically connected to the second end of the driving module, and the second end of the second light-emitting control module is electrically connected to the first electrode of the light-emitting element; in the preparation stage before the first stage, the first light-emitting control module and the second light-emitting control module are turned off, and at least one of the first switch module and the second switch module is turned off.

[0015] In this way, in the preparation stage, by controlling at least one of the first switch module and the second switch module to be turned off, the first power supply voltage signal of the first power supply voltage signal line can be prevented from flowing into the second voltage signal line through this branch of the first switch module and the second switch module, thereby ensuring the safety of the circuit.

[0016] According to any of the aforementioned embodiments of the first aspect of the present application, the pixel circuit also includes a first reset module, the control end of the first reset module is electrically connected to the first scanning signal line, the first end of the first reset module is electrically connected to the first reference voltage signal line, and the second end of the first reset module is electrically connected to the first electrode of the light-emitting element; in the preparation stage, the first reset module is turned off.

[0017] In this way, in the preparation stage, by turning off the first reset module, the first power supply voltage signal of the first power supply voltage signal line can be prevented from being transmitted to the first reference voltage signal line, thereby ensuring the safety of the circuit.

[0018] According to any of the aforementioned embodiments of the first aspect of the present application, the first control signal line is multiplexed with the first scan signal line.

[0019] According to any of the aforementioned embodiments of the first aspect of the present application, the pixel circuit also includes: a data writing module, a control end of the data writing module is electrically connected to the second scanning signal line, a first end of the data writing module is electrically connected to the data signal line, and a second end of the data writing module is electrically connected to the second end of the driving module; a data writing stage is also included between the first stage and the second stage, in which the data writing module is turned on in response to the conduction level provided by the second scanning signal line, and the data writing module is used to write the data signal provided by the data signal line.

[0020] According to any of the aforementioned embodiments of the first aspect of the present application, the pixel circuit also includes: a threshold compensation module, the control end of the threshold compensation module is electrically connected to the second scanning signal line, the first end of the threshold compensation module is electrically connected to the first node, and the second end of the threshold compensation module is electrically connected to the first end of the driving module, and the threshold compensation module is used to compensate for the threshold voltage of the driving module; in the data writing stage, the threshold compensation module is turned on in response to the conduction level provided by the second scanning signal line, and the data signal provided by the data signal line is transmitted to the first node via the data writing module and the threshold compensation module.

[0021] According to any of the aforementioned embodiments of the first aspect of the present application, the first reset module remains turned on during the first phase and the data writing phase.

[0022] According to any of the aforementioned embodiments of the first aspect of the present application, the second switch module remains turned on during the light-emitting stage.

[0023] According to any of the aforementioned implementations of the first aspect of the present application, the driving module includes an N-type transistor.

[0024] According to any of the aforementioned embodiments of the first aspect of the present application, the pixel circuit also includes a second reset module, the control end of the second reset module is electrically connected to the third scanning signal line, the first end of the second reset module is electrically connected to the second reference voltage signal line, and the second end of the second reset module is electrically connected to the first node. In the first stage, the second reset module is turned on and the second reference voltage signal provided by the second reference voltage signal line is transmitted to the first node to reset the first node.

[0025] According to any of the aforementioned embodiments of the first aspect of the present application, the voltage value of the second reference voltage signal is greater than the sum of the voltage value of the data signal and the threshold voltage of the driving module.

[0026] In a second aspect, an embodiment of the present application provides a driving method, which is applied to the pixel circuit provided in the first aspect, and the driving method includes: in a first stage, providing a conduction level to the first control signal line and providing a cutoff level to the second control signal line to turn on the first switch module and write the first voltage signal to the second end of the coupling module; in a second stage, providing a conduction level to the second control signal line and providing a cutoff level to the first control signal line to turn on the second switch module and write the second voltage signal to the second end of the coupling module; wherein the voltage value of the second voltage signal is less than the voltage value of the first voltage signal.

[0027] In a third aspect, an embodiment of the present application provides a display panel, which includes the pixel circuit provided in the first aspect.

[0028] The inventors of this application have discovered that, for a driver module in a pixel circuit to operate in a saturation region, a significant voltage difference must exist between the potential of the first terminal of the driver module and the potential of the control terminal of the driver module. Specifically, a significant voltage difference must exist between the voltage value of the first power supply voltage signal and the potential of the first node. As the voltage value of the first power supply voltage signal decreases, the voltage difference between the potential of the first terminal of the driver module and the potential of the control terminal of the driver module decreases, preventing the driver module from operating in the saturation region.

[0029] The pixel circuit, driving method, and display panel of the embodiments of the present application are provided with a coupling module, a first switch module, and a second switch module. The first end of the coupling module is electrically connected to the first node; the control end of the first switch module is electrically connected to the first control signal line, the first end of the first switch module is electrically connected to the first voltage signal line, and the second end of the first switch module is electrically connected to the second end of the coupling module; the control end of the second switch module is electrically connected to the second control signal line, the first end of the second switch module is electrically connected to the second voltage signal line, and the second end of the second switch module is electrically connected to the second end of the coupling module. In a first phase, the first switch module is turned on and writes a first voltage signal to the second end of the coupling module; in a second phase, the second switch module is turned on and writes a second voltage signal to the second end of the coupling module. The voltage value of the second voltage signal is less than the voltage value of the first voltage signal. In response to the potential change of the second end of the coupling module, the coupling module lowers the potential of the first node through coupling. On the one hand, since the potential of the first node is pulled down, even when the voltage value of the first power supply voltage signal is low, a large voltage difference can still be maintained between the potential of the first end of the driving module and the potential of the control end of the driving module, so that the driving module in the pixel circuit can operate in the saturation region, thereby ensuring that the pixel circuit can normally output the driving current; on the other hand, since the voltage value of the first power supply voltage signal output by the first power supply voltage signal line is reduced, power consumption can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 A circuit diagram of a pixel circuit provided in an embodiment of the present application;

[0032] Figure 2 Another circuit diagram of a pixel circuit provided in an embodiment of the present application;

[0033] Figure 3 Another circuit diagram of a pixel circuit provided in an embodiment of the present application;

[0034] Figure 4 Another circuit diagram of a pixel circuit provided in an embodiment of the present application;

[0035] Figure 5 Another circuit diagram of a pixel circuit provided in an embodiment of the present application;

[0036] Figure 6 Another circuit diagram of a pixel circuit provided in an embodiment of the present application;

[0037] Figure 7 Another circuit diagram of a pixel circuit provided in an embodiment of the present application;

[0038] Figure 8 for Figure 7 A driving timing diagram corresponding to the pixel circuit shown;

[0039] Figure 9 A schematic diagram of a process flow of a driving method provided in an embodiment of the present application;

[0040] Figure 10 A schematic structural diagram of a display panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0042] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or device comprising the elements.

[0043] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0044] It should be noted that the transistors in the embodiments of the present application can be either N-type transistors or P-type transistors. For N-type transistors, the on-level is a high level, and the off-level is a low level. That is, when the gate of the N-type transistor is at a high level, the first and second electrodes of the transistor are conductive, and when the gate of the N-type transistor is at a low level, the first and second electrodes of the transistor are disconnected. For P-type transistors, the on-level is a low level, and the off-level is a high level. That is, when the control terminal of the P-type transistor is at a low level, the first and second electrodes of the transistor are conductive, and when the control terminal of the P-type transistor is at a high level, the first and second electrodes of the transistor are disconnected. In a specific implementation, the gate of each of the above-mentioned transistors serves as its control terminal, and depending on the signal of the gate of each transistor and its type, the first electrode of the transistor can serve as the source and the second electrode as the drain, or the first electrode can serve as the drain and the second electrode as the source, without distinction being made herein. In addition, the on-level and off-level in the embodiments of the present invention are both general terms. The on-level refers to any level that can turn the transistor on, and the off-level refers to any level that can turn the transistor off / on.

[0045] In the embodiments of the present application, the term “electrically connected” may refer to a direct electrical connection between two components, or may refer to an electrical connection between two components via one or more other components.

[0046] In the embodiment of the present application, the first node, the second node and the third node are only defined for the convenience of describing the circuit structure. The first node, the second node and the third node are not actual circuit units.

[0047] It will be apparent to those skilled in the art that various modifications and variations can be made in this application without departing from the spirit or scope of this application. Therefore, this application is intended to cover modifications and variations of this application that fall within the scope of the corresponding claims (technical solutions claimed for protection) and their equivalents. It should be noted that the embodiments provided in the examples of this application can be combined with each other without contradiction.

[0048] Before describing the technical solutions provided by the embodiments of the present application, in order to facilitate understanding of the embodiments of the present application, the present application first specifically describes the problems existing in the related art:

[0049] In display panels (such as OLED display panels), the pixel circuit plays a crucial role in driving the light-emitting elements to emit stable light. The pixel circuit is provided with a driver module (such as a driver transistor) that provides the driving current that drives the light-emitting elements to emit light. Generally speaking, the driver module in the pixel circuit is typically driven by a first power supply voltage signal (such as a positive power supply voltage signal).

[0050] However, the inventors of the present application have discovered that when the voltage value of the first power supply voltage signal is low, the driving module in the pixel circuit cannot operate in the saturation region, thereby causing the pixel circuit to be unable to output the driving current normally.

[0051] Specifically, if the driver module in the pixel circuit is to operate in the saturation region, a large voltage difference must exist between the potential of the first terminal of the driver module and the potential of the control terminal of the driver module. In other words, a large voltage difference must exist between the voltage value of the first power supply voltage signal and the potential of the first node. However, as the voltage value of the first power supply voltage signal decreases, the voltage difference between the potential of the first terminal of the driver module and the potential of the control terminal of the driver module decreases, making it impossible for the driver module to operate in the saturation region.

[0052] Because the potential of the control terminal of the driver module is affected by the data signal, the potential of the control terminal of the driver module can be lowered by making the voltage value of the data signal negative, thereby increasing the voltage difference between the potential of the first terminal of the driver module and the potential of the control terminal of the driver module. However, some current driver chips can only output data signals with positive voltage values, such as 0V to 7.6V. Therefore, lowering the potential of the control terminal of the driver module by adjusting the voltage value of the data signal to a negative value is difficult to implement.

[0053] To this end, the embodiments of the present application provide a pixel circuit, a driving method and a display panel, which can enable the driving module to operate in the saturation region when the voltage value of the first power supply voltage signal is low without adjusting the voltage value of the data signal to a negative value.

[0054] The technical concept of the embodiment of the present application is that: a coupling module, a first switch module, and a second switch module are added to the pixel circuit. In a first phase, the first switch module is turned on to write a first voltage signal to the second terminal of the coupling module. In a second phase, the second switch module is turned on to write a second voltage signal to the second terminal of the coupling module. The voltage value of the second voltage signal is less than the voltage value of the first voltage signal. In response to the potential change of the second terminal of the coupling module, the coupling module lowers the potential of the first node through coupling. On the one hand, because the potential of the first node is lowered, even when the voltage value of the first power supply voltage signal is low, a large voltage difference can be maintained between the potential of the first terminal of the driving module and the potential of the control terminal of the driving module, so that the driving module in the pixel circuit can operate in the saturation region, thereby ensuring that the pixel circuit can normally output the driving current. On the other hand, because the voltage value of the first power supply voltage signal output by the first power supply voltage signal line is reduced, power consumption can be reduced.

[0055] The following first introduces the pixel circuit provided in the embodiment of the present application.

[0056] Figure 1A circuit diagram of a pixel circuit provided in an embodiment of the present application. Figure 1 As shown, the pixel circuit 10 may include a driving module 101, a coupling module 102, a first switching module 103 and a second switching module 104. The control end of the driving module 101 is electrically connected to the first node N1, the first end of the driving module 101 is electrically connected to the first power supply voltage signal line VDD, and the second end of the driving module 101 can be electrically connected to the first electrode of the light-emitting element D. The driving module 101 can be used to drive the light-emitting element D to emit light. The first power supply voltage signal line VDD can provide a first power supply voltage signal with a forward voltage value, and the driving module 101 can operate under the drive of the first power supply voltage signal. Exemplarily, the light-emitting element D includes but is not limited to an organic light-emitting diode (OLED). The first electrode of the light-emitting element D can be an anode of the light-emitting element D, and the second electrode of the light-emitting element D can be a cathode of the light-emitting element D.

[0057] A first terminal of the coupling module 102 is electrically connected to the first node N1 .

[0058] The control end of the first switch module 103 is electrically connected to the first control signal line K1, the first end of the first switch module 103 is electrically connected to the first voltage signal line V1, and the second end of the first switch module 103 is electrically connected to the second end of the coupling module 102. In some examples, the first control signal line K1 can be an additional signal line, or can be reused as a scanning signal line or a light-emitting control signal line, which is not limited in this embodiment of the present application.

[0059] The control end of the second switch module 104 is electrically connected to the second control signal line K2, the first end of the second switch module 104 is electrically connected to the second voltage signal line V2, and the second end of the second switch module 104 is electrically connected to the second end of the coupling module 102. In some examples, the second control signal line K2 can be an additional signal line, or can be reused as a scanning signal line or a light-emitting control signal line, which is not limited in this embodiment of the present application.

[0060] In the first phase, the first switch module 103 is turned on, and the first voltage signal provided by the first voltage signal line V1 is written to the second end of the coupling module 102. Specifically, in the first phase, the first switch module 103 is turned on under the control of the first control signal line K1, and the second switch module 104 is turned off under the control of the second control signal line K2. The first voltage signal provided by the first voltage signal line V1 is transmitted to the second end of the coupling module 102 through the turned-on first switch module 103.

[0061] In the second phase, the second switch module 104 is turned on, and the second voltage signal provided by the second voltage signal line V2 is written to the second end of the coupling module 102. Specifically, in the second phase, the first switch module 103 is turned off under the control of the first control signal line K1, and the second switch module 104 is turned on under the control of the second control signal line K2. The second voltage signal provided by the second voltage signal line V2 is transmitted to the second end of the coupling module 102 through the turned-on second switch module 104.

[0062] In the embodiment of the present application, the voltage value of the second voltage signal is lower than the voltage value of the first voltage signal. Therefore, the potential of the second terminal of the coupling module 102 will drop. Since the potential of the second terminal of the coupling module 102 changes, i.e., the potential drops, the coupling module 102 can respond to the potential change of the second terminal of the coupling module 102 and lower the potential of the first terminal of the coupling module 102 (i.e., the first node N1) through its own coupling action.

[0063] In this way, on the one hand, since the potential of the first node N1 is pulled down, even when the voltage value of the first power supply voltage signal is low, a large voltage difference can still be maintained between the potential of the first end of the driving module 101 and the potential of the control end of the driving module 101, so that the driving module 101 in the pixel circuit can operate in the saturation region, thereby ensuring that the pixel circuit can normally output the driving current; on the other hand, since the voltage value of the first power supply voltage signal output by the first power supply voltage signal line V1 is reduced, power consumption can be reduced.

[0064] Figure 2 Another circuit diagram of a pixel circuit provided in an embodiment of the present application. Figure 2 As shown, according to some embodiments of the present application, the first voltage signal line V1 can optionally be reused as the first power supply voltage signal line VDD. In the first phase, the first switch module 103 is turned on, writing the first power supply voltage signal to the second end of the coupling module 102. Specifically, in the first phase, the first switch module 103 is turned on under the control of the first control signal line K1, and the second switch module 104 is turned off under the control of the second control signal line K2. The first power supply voltage signal provided by the first power supply voltage signal line VDD is transmitted to the second end of the coupling module 102 through the turned-on first switch module 103.

[0065] The voltage value of the second voltage signal is less than the voltage value of the first power supply voltage signal. Therefore, in the second phase, the potential of the second terminal of the coupling module 102 will drop. Since the potential of the second terminal of the coupling module 102 changes, i.e., the potential drops, the coupling module 102 can respond to the potential change of the second terminal of the coupling module 102 and lower the potential of the first node N1 through its own coupling action, thereby enabling the driving module 101 in the pixel circuit to operate in the saturation region, ensuring that the pixel circuit can normally output the driving current.

[0066] In this way, the first voltage signal line V1 is reused as the first power supply voltage signal line VDD, which can reduce the number of signal lines in the display panel, save wiring space, and reduce production costs.

[0067] According to some embodiments of the present application, the voltage value of the first power supply voltage signal may optionally be less than 10V, that is, the voltage value of the first power supply voltage signal may be reduced to below 10V. For example, in some specific examples, the voltage value of the first power supply voltage signal may be reduced to below 8V, such as 5V, 6V, or other voltage values. In this way, by reducing the voltage value of the first power supply voltage signal, the overall power consumption may be reduced.

[0068] Continue to see Figure 2 According to some embodiments of the present application, the second voltage signal line V2 can optionally reuse the third reference voltage signal line vref3. In the second phase, the second switch module 104 is turned on, and the third reference voltage signal provided by the third reference voltage signal line vref3 is written to the second end of the coupling module 102. Specifically, in the second phase, the first switch module 103 is turned off under the control of the first control signal line K1, and the second switch module 104 is turned on under the control of the second control signal line K2. The third reference voltage signal provided by the third reference voltage signal line vref3 is transmitted to the second end of the coupling module 102 through the turned-on second switch module 104.

[0069] The voltage value of the third reference voltage signal is lower than the voltage value of the first power supply voltage signal. Therefore, in the second phase, the potential of the second terminal of the coupling module 102 will drop. Since the potential of the second terminal of the coupling module 102 changes, i.e., the potential drops, the coupling module 102 can respond to the potential change of the second terminal of the coupling module 102 and lower the potential of the first node N1 through its own coupling action, thereby enabling the driving module 101 in the pixel circuit to operate in the saturation region, ensuring that the pixel circuit can normally output the driving current.

[0070] In some specific embodiments, the voltage value of the third reference voltage signal may be 2V, 3V, or other values ​​less than the voltage value of the first power supply voltage signal. For example, when the first power supply voltage signal is 7V, the voltage value of the third reference voltage signal may be 5V.

[0071] Figure 3 This is another circuit diagram of a pixel circuit provided in an embodiment of the present application. Figure 3 As shown, according to some embodiments of the present application, the pixel circuit 10 may optionally further include a storage module 301. A first end of the storage module 301 may be electrically connected to the first node N1, and a second end of the storage module 301 may be electrically connected to the first electrode of the light-emitting element D. The storage module 301 primarily maintains the potential of the first node N1. Furthermore, during the light-emitting phase, the storage module 301 also regulates the potential of the first node N1 through its own coupling effect in response to changes in the potential of the first electrode of the light-emitting element D.

[0072] Specifically, during the light-emitting phase following the second phase, the potential of the first electrode of the light-emitting element D changes, such as by increasing by Δu. Accordingly, because the second terminal of the driver module 101 is directly or indirectly electrically connected to the first electrode of the light-emitting element D, the potential of the second terminal of the driver module 101 also increases by Δu. Due to the change in the potential of the first electrode of the light-emitting element D, the storage module 301 can adjust the potential of the first node N1 through its own coupling in response to the change in the potential of the first electrode of the light-emitting element D, such as by also increasing the potential of the first node N1 by Δu. Thus, during the light-emitting phase, the coupling of the storage module 301 can ensure that the potential change trend of the control terminal of the driver module 101 is consistent with the potential change trend of the second terminal of the driver module 101, so that the difference between the potential of the control terminal of the driver module 101 and the potential of the second terminal of the driver module 101 (i.e., the gate-source voltage Vgs) remains constant. Since the drive current is related to the gate-source voltage Vgs, when the gate-source voltage Vgs remains constant, the drive current of the pixel circuit can be kept constant, thereby ensuring the stability and uniformity of the brightness of the light-emitting element.

[0073] Continue to see Figure 3 According to some embodiments of the present application, optionally, the storage module 301 may include a storage capacitor Cst, a first plate of the storage capacitor Cst is electrically connected to the first node N1, and a second plate of the storage capacitor Cst is electrically connected to the first electrode of the light-emitting element D.

[0074] During the light-emitting stage, the storage capacitor Cst can respond to the potential change of the first electrode of the light-emitting element D and adjust the potential of the first node N1 through its own coupling effect, so that the difference between the potential of the control end of the driving module 101 and the potential of the second end of the driving module 101 (i.e., the gate-source voltage Vgs) remains constant, thereby keeping the driving current of the pixel circuit constant, thereby ensuring the stability and uniformity of the brightness of the light-emitting element.

[0075] Figure 4 This is another circuit diagram of a pixel circuit provided in an embodiment of the present application. Figure 4 As shown, according to some embodiments of the present application, the pixel circuit 10 may optionally further include a first light-emitting control module 401 and a second light-emitting control module 402. A control terminal of the first light-emitting control module 401 is electrically connected to the first light-emitting control signal line EM1, a first terminal of the first light-emitting control module 401 is electrically connected to the first power supply voltage signal line VDD, and a second terminal of the first light-emitting control module 401 is electrically connected to the first terminal of the driving module 101. A control terminal of the second light-emitting control module 402 is electrically connected to the first light-emitting control signal line EM1, a first terminal of the second light-emitting control module 402 is electrically connected to the second terminal of the driving module 101, and a second terminal of the second light-emitting control module 402 is electrically connected to the first electrode of the light-emitting element D.

[0076] A preparation phase may also be included before the first phase. During the preparation phase, the first light control signal line EM1 switches from an output on-level to an off-level. The first light control module 401 and the second light control module 402 are shut down in response to the off-level of the first light control signal line EM1. Simultaneously, at least one of the first switch module 103 and the second switch module 104 is shut down. For example, the first switch module 103 is shut down in response to the control of the first control signal line K1, and / or the second switch module 104 is shut down in response to the control of the second control signal line K2.

[0077] like Figure 4 As shown, the advantage of this is that: in the preparation stage, by controlling at least one of the first switch module 103 and the second switch module 104 to be turned off, the first power supply voltage signal of the first power supply voltage signal line VDD can be prevented from flowing into the second voltage signal line V2 through this branch of the first switch module 103 and the second switch module 104, thereby ensuring the safety of the circuit.

[0078] Figure 5 This is another circuit diagram of a pixel circuit provided in an embodiment of the present application. Figure 5As shown, according to some embodiments of the present application, optionally, the pixel circuit 10 may further include a first reset module 501, the control end of the first reset module 501 is electrically connected to the first scanning signal line S1, the first end of the first reset module 501 is electrically connected to the first reference voltage signal line vref1, and the second end of the first reset module 501 is electrically connected to the first electrode of the light-emitting element D.

[0079] In the first stage, the first reset module 501 can be turned on under the control of the first scan signal line S1 to transmit the first reference voltage signal of the first reference voltage signal line vref1 to the first electrode of the light emitting element D to reset the first electrode of the light emitting element D.

[0080] In addition, in the preparation phase before the first phase, the first reset module 501 can be turned off under the control of the first scan signal line S1. Figure 5 As shown, this approach has the advantage of: during the preparation phase, since the first and second light-emitting control modules 401 and 402 have just been shut down, they may not be completely shut down. In other words, residual charge may still exist in the branch between the first and second light-emitting control modules 401 and 402. Therefore, if the first reset module 501 is turned on, the first power supply voltage signal of the first power supply voltage signal line VDD may be transmitted to the first reference voltage signal line vref1 through the first light-emitting control module 401, the driver module 101, the second light-emitting control module 402, and the first reset module 501 in sequence, thereby damaging the first reference voltage signal line vref1. However, by shutting down the first reset module 501, the first power supply voltage signal of the first power supply voltage signal line VDD can be prevented from being transmitted to the first reference voltage signal line vref1, thereby ensuring circuit safety.

[0081] Continue to see Figure 5 According to some embodiments of the present application, optionally, the first control signal line K1 can be multiplexed with the first scan signal line S1.

[0082] In this way, the first control signal line K1 is multiplexed with the first scan signal line S1 , which can reduce the number of signal lines in the display panel, save wiring space, and reduce production costs.

[0083] Figure 6 This is another circuit diagram of a pixel circuit provided in an embodiment of the present application. Figure 6As shown, according to some embodiments of the present application, the pixel circuit 10 may optionally further include a data writing module 601. A control end of the data writing module 601 is electrically connected to the second scan signal line S2, a first end of the data writing module 601 is electrically connected to the data signal line data, and a second end of the data writing module 601 is electrically connected to the second end of the driving module 101.

[0084] A data writing phase is also included between the first phase and the second phase. In the data writing phase, the data writing module 601 is turned on in response to the conduction level provided by the second scanning signal line S2. The data writing module 601 can be used to write the data signal provided by the data signal line data.

[0085] Continue to see Figure 6 According to some embodiments of the present application, optionally, the pixel circuit further includes a threshold compensation module 602, a control end of the threshold compensation module 602 is electrically connected to the second scan signal line S2, a first end of the threshold compensation module 602 is electrically connected to the first node, and a second end of the threshold compensation module 602 is electrically connected to the first end of the driving module 101. The threshold compensation module 602 can be used to compensate for the threshold voltage Vth of the driving module 101.

[0086] During the data writing stage, the data writing module 601 can be turned on in response to the conduction level provided by the second scanning signal line S2, and the threshold compensation module 602 can be turned on in response to the conduction level provided by the second scanning signal line S2. The data signal provided by the data signal line data is transmitted to the first node N1 via the data writing module 601 and the threshold compensation module 602, thereby realizing data signal writing and threshold voltage compensation of the driving module 101.

[0087] Continue to see Figure 6 According to some embodiments of the present application, the first reset module 501 can optionally remain turned on during the first phase and the data writing phase. As previously described, in the first phase, the first reset module 501 can be turned on under the control of the first scan signal line S1, and transmit the first reference voltage signal of the first reference voltage signal line vref1 to the first electrode of the light-emitting element D to reset the first electrode of the light-emitting element D. In the data writing phase, the first reset module 501 is controlled to remain turned on, so that the first reference voltage signal of the first reference voltage signal line vref1 can be written to the second end of the storage module 301, thereby maintaining the potential of the second end of the storage module 301 stable, and further allowing the storage module 301 to maintain the first node N1, so that the potential of the first node N1 during the data writing phase remains at Vdata+Vth. Wherein, Vdata represents the voltage value of the data signal, and Vth represents the threshold voltage of the driving module 101.

[0088] Similarly, the second switch module 104 can remain on during the light-emitting phase, allowing the second voltage signal provided by the second voltage signal line V2 to be transmitted to the second end of the coupling module 102, thereby maintaining stability at the second end of the coupling module 102. On the one hand, the coupling module 102 can maintain the first node N1; on the other hand, it can prevent coupling within the coupling module 102, thereby ensuring the stability of the potential at the first node N1 and ensuring that the light-emitting element can emit light stably.

[0089] Continue to see Figure 6 According to some embodiments of the present application, optionally, the pixel circuit 10 may further include a second reset module 603, the control end of the second reset module 603 is electrically connected to the third scan signal line S3, the first end of the second reset module 603 is electrically connected to the second reference voltage signal line vref2, and the second end of the second reset module 603 is electrically connected to the first node N1.

[0090] In the first stage, the second reset module 603 is turned on under the control of the third scan signal line S3, and transmits the second reference voltage signal provided by the second reference voltage signal line vref2 to the first node N1 to reset the first node N1.

[0091] According to some embodiments of the present application, the driving module 101 may optionally include an N-type transistor. In addition, other transistors in the pixel circuit 10 may also be N-type transistors. In some specific embodiments, all transistors in the pixel circuit 10 may be oxide transistors (such as IGZO transistors), and all are N-type transistors.

[0092] Compared with LTPS (Low Temperature Poly-Silicon) transistors, the uniformity of N-type transistors formed by IGZO (Indium Gallium Zinc Oxide) is significantly better than that of LTPS transistors, thereby improving the stability and uniformity of the output current of the pixel circuit.

[0093] Accordingly, when the driving module 101 is an N-type transistor, the voltage value of the second reference voltage signal can be greater than the sum of the voltage value of the data signal and the threshold voltage of the driving module, thereby resetting the first node. The voltage value of the data signal can refer to the voltage value of the data signal corresponding to the maximum grayscale (such as 255 grayscale), that is, the maximum data voltage, commonly known as the white state voltage.

[0094] The pixel circuit 10 provided in the embodiment of the present application is described below with reference to a specific circuit structure.

[0095] Figure 7This is another circuit diagram of a pixel circuit provided in an embodiment of the present application. Figure 7 As shown, according to some embodiments of the present application, optionally, the first control signal line K1 can reuse the first scan signal line S1, the second control signal line K2 can reuse the second light-emitting control signal line EM2, the first voltage signal line V1 can reuse the first power supply voltage signal line VDD, and the second voltage signal line V2 can reuse the third reference voltage signal line vref3.

[0096] The driving module 101 may include a first transistor T1, the first switching module 103 may include a second transistor T2, the second switching module 104 may include a third transistor T3, the first light-emitting control module 401 may include a fourth transistor T4, the second light-emitting control module 402 may include a fifth transistor T5, the first reset module 501 may include a sixth transistor T6, the data writing module 601 may include a seventh transistor T7, the threshold compensation module 602 may include an eighth transistor T8, the second reset module 603 may include a ninth transistor T9, the coupling module 102 may include a coupling capacitor C1, and the storage module 301 may include a storage capacitor Cst.

[0097] A gate of the first transistor T1 may be electrically connected to the first node N1 , a first electrode of the first transistor T1 may be electrically connected to the second node N2 , and a second electrode of the first transistor T1 may be electrically connected to the third node N3 .

[0098] A first plate of the coupling capacitor C1 may be electrically connected to the first node N1 .

[0099] The gate of the second transistor T2 can be electrically connected to the first scan signal line S1, the first electrode of the second transistor T2 can be electrically connected to the first power supply voltage signal line VDD, and the second electrode of the second transistor T2 can be electrically connected to the second plate of the coupling capacitor C1.

[0100] The gate of the third transistor T3 can be electrically connected to the second light emitting control signal line EM2, the first electrode of the third transistor T3 can be electrically connected to the third reference voltage signal line vref3, and the second electrode of the third transistor T3 can be electrically connected to the second plate of the coupling capacitor C1.

[0101] The gate of the fourth transistor T4 is electrically connected to the first light emitting control signal line EM1 , the first electrode of the fourth transistor T4 is electrically connected to the first power supply voltage signal line VDD, and the second electrode of the fourth transistor T4 is electrically connected to the first electrode of the first transistor T1 .

[0102] The gate of the fifth transistor T5 is electrically connected to the first light emitting control signal line EM1 , the first electrode of the fifth transistor T5 is electrically connected to the second end of the driving module 101 , and the second electrode of the fifth transistor T5 is electrically connected to the first electrode of the light emitting element D.

[0103] A first plate of the storage capacitor Cst is electrically connected to the first node N1, and a second plate of the storage capacitor Cst is electrically connected to the first electrode of the light emitting element D. A second electrode of the light emitting element D is electrically connected to the second power supply voltage signal line VSS.

[0104] The gate of the sixth transistor T6 is electrically connected to the first scan signal line S1 , the first electrode of the sixth transistor T6 is electrically connected to the first reference voltage signal line vref1 , and the second electrode of the sixth transistor T6 is electrically connected to the first electrode of the light emitting element D.

[0105] A gate of the seventh transistor T7 is electrically connected to the second scan signal line S2 , a first electrode of the seventh transistor T7 is electrically connected to the data signal line data, and a second electrode of the seventh transistor T7 is electrically connected to the second electrode of the first transistor T1 .

[0106] A gate of the eighth transistor T8 is electrically connected to the second scan signal line S2 , a first electrode of the eighth transistor T8 is electrically connected to the first node, and a second electrode of the eighth transistor T8 is electrically connected to the first electrode of the first transistor T1 .

[0107] A gate of the ninth transistor T9 is electrically connected to the third scan signal line S3 , a first electrode of the ninth transistor T9 is electrically connected to the second reference voltage signal line vref2 , and a second electrode of the ninth transistor T9 is electrically connected to the first node N1 .

[0108] Figure 8 for Figure 7 A driving timing diagram corresponding to the pixel circuit shown in FIG. Figure 7 and Figure 8 As shown, according to some embodiments of the present application, optionally, the working process of the pixel circuit 10 may include a preparation phase t0, a first phase t1, a data writing phase t2, a second phase t3 and a light emitting phase t4. Figure 7 In the illustrated embodiment, the first transistor T1 to the ninth transistor T9 may all be N-type transistors.

[0109] In the preparation phase t0, the first emission control signal line EM1, the second emission control signal line EM2, the first scan signal line S1, the second scan signal line S2, and the third scan signal line S3 all output a low level. In response to the low level of the first emission control signal line EM1, the fourth transistor T4 and the fifth transistor T5 are turned off, thereby shutting off the transmission path of the drive current of the pixel circuit 10. The second transistor T2 is turned off in response to the low level of the first scan signal line S1, and the sixth transistor T6 is turned off in response to the low level of the first scan signal line S1.

[0110] During the first phase t1, the first emission control signal line EM1, the second emission control signal line EM2, and the second scan signal line S2 all output a low level, while the first scan signal line S1 and the third scan signal line S3 both output a high level. The fourth transistor T4 and the fifth transistor T5 are turned off in response to the low level of the first emission control signal line EM1. The sixth transistor T6 is turned on in response to the high level of the first scan signal line S1, and the first reference voltage signal provided by the first reference voltage signal line vref1 resets the first electrode of the light-emitting element D. The ninth transistor T9 is turned on in response to the high level of the third scan signal line S3, and the second reference voltage signal provided by the second reference voltage signal line vref2 resets the first node N1. The second transistor T2 is turned on in response to the high level of the first scan signal line S1, and the first power supply voltage signal of the first power supply voltage signal line VDD is transmitted to the second plate of the coupling capacitor C1.

[0111] During data writing phase t2, the first light-emitting control signal line EM1, the second light-emitting control signal line EM2, and the third scan signal line S3 all output a low level, while the first scan signal line S1 and the second scan signal line S2 both output a high level. The seventh transistor T7 and the eighth transistor T8 are turned on in response to the on-level provided by the second scan signal line S2. The data signal provided by the data signal line data is transmitted to the first node N1 via the seventh transistor T7 and the eighth transistor T8, thereby writing the data signal and compensating the threshold voltage of the driver module 101. The potential of the first node N1 is Vdata + Vth. Vdata represents the voltage value of the data signal, and Vth represents the threshold voltage of the driver module 101. The second transistor T2 remains on in response to the high level of the first scan signal line S1. The sixth transistor T6 remains on in response to the high level of the first scan signal line S1.

[0112] In the second phase t3, the first light-emitting control signal line EM1, the first scan signal line S1, the second scan signal line S2, and the third scan signal line S3 all output a low level, and the second light-emitting control signal line EM2 outputs a high level. The third transistor T3 is turned on in response to the high level of the second light-emitting control signal line EM2, and the third reference voltage signal of the third reference voltage signal line vref3 is transmitted to the second plate of the coupling capacitor C1. Under the coupling effect of the coupling capacitor C1, the potential of the first node N1 changes, and the potential of the first node N1 changes from V N1 =Vdata+Vth-VDD'+Vref3'. N1 represents the potential of the first node N1, VDD' represents the voltage value of the first power supply voltage signal, and Vref3' represents the voltage value of the third reference voltage signal. Since Vref3'<VDD', Vdata+Vth-VDD'+Vref3'<Vdata+Vth, the potential of the first node N1 decreases.

[0113] During light-emitting phase t4, the first and second light-emitting control signal lines EM1 and EM2 output a high level, while the first, second, and third scan signal lines S1, S2, and S3 all output a low level. The first, fourth, and fifth transistors T1, T4, and T5 are turned on, causing the light-emitting element D to emit light. The third transistor T3 remains turned on in response to the high level of the second light-emitting control signal line EM2, maintaining the stability of the potential of the first node N1.

[0114] Among them, the expression of the driving current of the pixel circuit is as follows:

[0115]

[0116] Where, Id represents the driving current, represents the width-to-length ratio of the first transistor channel, Cox represents the dielectric constant of the channel insulating layer, u represents the channel carrier mobility, and Vref1 ′ represents the voltage value of the first reference voltage signal.

[0117] Based on the pixel circuit 10 provided in the above embodiment, the present application also provides a driving method. The driving method can be applied to the pixel circuit 10 provided in the above embodiment. Please refer to the following embodiments.

[0118] Figure 9 A flow chart of the driving method provided in the embodiment of the present application. Figure 9 As shown, the driving method provided in the embodiment of the present application may include the following steps:

[0119] S901. In the first stage, provide an on-level to the first control signal line and an off-level to the second control signal line, so as to turn on the first switch module and write the first voltage signal into the second terminal of the coupling module.

[0120] S902. In the second stage, provide an on-level to the second control signal line and an off-level to the first control signal line, so as to turn on the second switch module and write the second voltage signal into the second terminal of the coupling module.

[0121] The voltage value of the second voltage signal is smaller than the voltage value of the first voltage signal.

[0122] The specific processes of steps S901 and S902 have been described in detail above and will not be repeated here.

[0123] In the driving method of an embodiment of the present application, in a first phase, the first switch module is turned on and writes a first voltage signal to the second terminal of the coupling module; in a second phase, the second switch module is turned on and writes a second voltage signal to the second terminal of the coupling module, wherein the voltage value of the second voltage signal is less than the voltage value of the first voltage signal. In response to the potential change of the second terminal of the coupling module, the coupling module lowers the potential of the first node through coupling. On the one hand, because the potential of the first node is lowered, even when the voltage value of the first power supply voltage signal is low, a large voltage difference can be maintained between the potential of the first terminal of the driving module and the potential of the control terminal of the driving module, allowing the driving module in the pixel circuit to operate in the saturation region, thereby ensuring that the pixel circuit can normally output the driving current. On the other hand, because the voltage value of the first power supply voltage signal output by the first power supply voltage signal line is reduced, power consumption can be reduced.

[0124] Based on the pixel circuit provided in the above embodiment, the present application also provides a display panel. Figure 10 , Figure 10 A schematic structural diagram of a display panel provided in an embodiment of the present application. Figure 10 The provided display panel 100 includes the pixel circuit 10 provided by any of the above embodiments of the present application. Figure 10 In the embodiment, a mobile phone is used as an example to illustrate the display panel 100. It is understood that the display device to which the display panel 100 provided in the embodiment of the present application is applied may be a wearable product, a computer, a television, a car display device, or other display device with a display function, and the present application does not impose any specific restrictions on this. The display panel provided in the embodiment of the present application has the beneficial effects of the pixel circuit 10 provided in the embodiment of the present application. For details, please refer to the specific description of the pixel circuit 10 in the above embodiments, and this embodiment will not be repeated here.

[0125] Exemplarily, the display panel 100 includes, but is not limited to, an OLED display panel.

[0126] It should be understood that the specific structures of the circuits provided in the drawings of the embodiments of the present application are merely examples and are not intended to limit the present application. In addition, the above embodiments provided in the present application may be combined with each other unless there is any contradiction.

[0127] It should be understood that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. According to the embodiments described above in accordance with the present application, these embodiments do not describe all the details in detail, nor do they limit the application to only the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and modifications based on the present application. The present application is limited only by the claims and their full scope and equivalents.

[0128] Those skilled in the art should understand that the above embodiments are illustrative rather than restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on a study of the drawings, the specification and the claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other structures; the quantity involves "one" but does not exclude multiple; the terms "first" and "second" are used to identify names rather than to indicate any specific order. Any figure marks in the claims should not be understood as limiting the scope of protection. The fact that certain technical features appear in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A pixel circuit, characterized in that: include: a driving module, wherein a control terminal of the driving module is electrically connected to the first node; a coupling module, wherein a first end of the coupling module is electrically connected to the first node; a first light control module, wherein a control end of the first light control module is electrically connected to a first light control signal line, a first end of the first light control module is electrically connected to a first power supply voltage signal line, and a second end of the first light control module is electrically connected to a first end of the driving module; a first switch module, wherein a control end of the first switch module is electrically connected to a first control signal line, a first end of the first switch module is electrically connected to a first voltage signal line, and a second end of the first switch module is electrically connected to a second end of the coupling module; a second switch module, wherein a control end of the second switch module is electrically connected to the second control signal line, a first end of the second switch module is electrically connected to the second voltage signal line, and a second end of the second switch module is electrically connected to the second end of the coupling module; In the first stage, the first switch module is turned on to write the first voltage signal into the second end of the coupling module; In the second stage, the second switch module is turned on and writes a second voltage signal to the second terminal of the coupling module. The voltage value of the second voltage signal is lower than the voltage value of the first voltage signal. In response to the potential change of the second terminal of the coupling module, the coupling module lowers the potential of the first node through coupling. The first voltage signal line multiplexes with a first power supply voltage signal line, and the first power supply voltage signal line provides a first power supply voltage signal with a positive voltage value; In the first stage, the first switch module is turned on to write the first power supply voltage signal into the second end of the coupling module; The working process of the pixel circuit includes a preparation phase, a first phase, a data writing phase, a second phase and a light emitting phase, wherein the first phase does not overlap with the light emitting phase.

2. The pixel circuit according to claim 1, wherein: The voltage value of the first power supply voltage signal is less than 10V.

3. The pixel circuit according to claim 1, wherein: The pixel circuit further includes: a storage module, wherein a first end of the storage module is electrically connected to the first node, a second end of the storage module is electrically connected to a first electrode of a light-emitting element, and the first electrode of the light-emitting element is directly or indirectly electrically connected to the second end of the driving module; In the light emitting stage after the second stage, the storage module adjusts the potential of the first node through coupling in response to the potential change of the first electrode of the light emitting element.

4. The pixel circuit according to claim 3, wherein: The storage module includes a storage capacitor, a first plate of the storage capacitor is electrically connected to the first node, and a second plate of the storage capacitor is electrically connected to the first electrode of the light-emitting element.

5. The pixel circuit according to claim 1, wherein: The pixel circuit further includes: a second light-emitting control module, wherein a control end of the second light-emitting control module is electrically connected to the first light-emitting control signal line, a first end of the second light-emitting control module is electrically connected to the second end of the driving module, and a second end of the second light-emitting control module is electrically connected to the first electrode of the light-emitting element; In a preparation phase before the first phase, the first light control module and the second light control module are turned off, and at least one of the first switch module and the second switch module is turned off.

6. The pixel circuit according to claim 5, wherein: The pixel circuit further includes a first reset module, wherein a control end of the first reset module is electrically connected to the first scan signal line, a first end of the first reset module is electrically connected to the first reference voltage signal line, and a second end of the first reset module is electrically connected to the first electrode of the light-emitting element; During the preparation phase, the first reset module is turned off.

7. The pixel circuit according to claim 6, wherein: The first control signal line is multiplexed with the first scan signal line.

8. The pixel circuit according to claim 6, wherein: The pixel circuit further includes: a data writing module, wherein a control end of the data writing module is electrically connected to the second scanning signal line, a first end of the data writing module is electrically connected to the data signal line, and a second end of the data writing module is electrically connected to the second end of the driving module; A data writing phase is also included between the first phase and the second phase. In the data writing phase, the data writing module is turned on in response to the conduction level provided by the second scanning signal line, and the data writing module is used to write the data signal provided by the data signal line.

9. The pixel circuit according to claim 8, wherein: The pixel circuit further includes: a threshold compensation module, wherein a control end of the threshold compensation module is electrically connected to the second scan signal line, a first end of the threshold compensation module is electrically connected to the first node, and a second end of the threshold compensation module is electrically connected to the first end of the driving module, and the threshold compensation module is used to compensate for the threshold voltage of the driving module; In the data writing phase, the threshold compensation module is turned on in response to the on-level provided by the second scanning signal line, and the data signal provided by the data signal line is transmitted to the first node via the data writing module and the threshold compensation module.

10. The pixel circuit according to claim 8, wherein: The first reset module remains turned on during the first phase and the data writing phase.

11. The pixel circuit according to claim 10, wherein: The second switch module remains turned on during the light emitting phase.

12. The pixel circuit according to claim 1, wherein: The driving module includes an N-type transistor.

13. The pixel circuit according to claim 12, wherein: The pixel circuit further includes a second reset module, wherein a control end of the second reset module is electrically connected to the third scan signal line, a first end of the second reset module is electrically connected to the second reference voltage signal line, and a second end of the second reset module is electrically connected to the first node. In the first stage, the second reset module is turned on to transmit the second reference voltage signal provided by the second reference voltage signal line to the first node to reset the first node.

14. The pixel circuit according to claim 13, wherein: The voltage value of the second reference voltage signal is greater than the sum of the voltage value of the data signal and the threshold voltage of the driving module.

15. A driving method, characterized in that: Applied to the pixel circuit according to any one of claims 1 to 14, the driving method includes: In the first stage, a conduction level is provided to the first control signal line, and an off level is provided to the second control signal line, so as to turn on the first switch module and write the first voltage signal into the second end of the coupling module; In the second stage, an on-level is provided to the second control signal line, and an off-level is provided to the first control signal line, so as to turn on the second switch module and write a second voltage signal into the second end of the coupling module; Wherein, the voltage value of the second voltage signal is smaller than the voltage value of the first voltage signal.

16. A display panel, characterized in that: The device comprises a pixel circuit as claimed in any one of claims 1 to 14.

Images