Pixel circuit, driving method thereof and display panel

Abstract

The embodiment of the invention discloses a pixel circuit and a driving method thereof and a display panel, the pixel circuit comprises a driving module, a voltage write-in module, a coupling module and a light emitting module, the voltage write-in module and a first end of the coupling module are connected to a first node, a second end of the coupling module is connected to a first control end of the driving module, and a second control end of the driving module is connected to a second node. The voltage write-in module is used for transmitting data voltage to a first node and writing voltage information associated with the data voltage into a first control end of the driving module through the coupling module; the second control end of the driving module is connected with the first voltage signal line, the driving module is used for adjusting the threshold voltage of the driving module according to the first voltage transmitted on the first voltage signal line, and the driving module is used for driving the light-emitting module to emit light. According to the scheme, the uniformity of display image quality is improved, and the display effect is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of display technology, and in particular to a pixel circuit and a driving method thereof, and a display panel. Background Art

[0002] With the continuous development of display technology, people's requirements for display quality are getting higher and higher.

[0003] Currently, the existing pixel circuit has the problem of poor display effect. Summary of the invention

[0004] The embodiment of the present invention provides a pixel circuit and a driving method thereof and a display panel to improve the display effect of the display panel.

[0005] According to one aspect of the present invention, there is provided a pixel circuit, comprising: a driving module, a voltage writing module, a coupling module and a light emitting module;

[0006] The voltage writing module and the first end of the coupling module are connected to a first node, the second end of the coupling module is connected to the first control end of the driving module, the voltage writing module is used to transmit the data voltage to the first node, and write the voltage information associated with the data voltage to the first control end of the driving module through the coupling module;

[0007] The second control end of the driving module is connected to the first voltage signal line, and the driving module is used to adjust its own threshold voltage according to the first voltage transmitted on the first voltage signal line;

[0008] The driving module and the light emitting module are connected between a first power line and a second power line, and the driving module is further used to drive the light emitting module to emit light in a light emitting stage.

[0009] Optionally, the pixel circuit further comprises a light emitting control module, a control end of the light emitting control module is connected to a light emitting control signal line, a first end of the light emitting control module is connected to a second end of the light emitting module, a second end of the light emitting control module is connected to a first end of the driving module, a second end of the driving module is connected to the second power line, and a first end of the light emitting module is connected to the first power line;

[0010] Preferably, the driving module includes a first transistor, the light emitting control module includes a fifth transistor, the light emitting module includes a light emitting diode, a first electrode of the light emitting diode is connected to the first power line, a second electrode of the light emitting diode is connected to a first electrode of the fifth transistor, a second electrode of the fifth transistor is connected to a first electrode of the first transistor, a second electrode of the first transistor is connected to the second power line, a gate of the fifth transistor is connected to the light emitting control signal line, a first gate of the first transistor is connected to the second end of the coupling module, and a second gate of the first transistor is connected to the first voltage signal line;

[0011] Optionally, the first transistor is an N-type transistor, and the first transistor is used to adjust a threshold voltage of the first transistor to a positive value according to a difference between the first voltage and a second power supply voltage transmitted on the second power supply line;

[0012] Preferably, the first gate of the first transistor is a top gate, and the second gate of the first transistor is a bottom gate, or the second gate of the first transistor is a top gate, and the first gate of the first transistor is a bottom gate.

[0013] Preferably, the pixel circuit further comprises a first initialization module, a first end of the first initialization module is connected to the first node, a second end of the first initialization module is connected to the first control end of the driving module, the voltage writing module is used to transmit a first initialization voltage to the first node in an initialization phase, and transmit the data voltage to the first node in a data writing phase, and the first initialization module is used to transmit the first initialization voltage on the first node to the first control end of the driving module in the initialization phase;

[0014] Preferably, a first end of the voltage writing module is connected to a data line, and the data line is configured to transmit the first initialization voltage in the initialization phase and transmit the data voltage in the data writing phase.

[0015] Optionally, the pixel circuit further includes a compensation module, the compensation module is connected between the first control terminal and the first terminal of the driving module, and the compensation module is used to compensate for the threshold voltage of the driving module in the compensation stage;

[0016] Optionally, the second end of the driving module is connected to the second power line, and the driving module is used to adjust its own threshold voltage according to the difference between the first voltage transmitted on the first voltage signal line and the second power voltage transmitted on the second power line during the threshold voltage adjustment stage;

[0017] Optionally, in a display cycle, the compensation phase is between the initialization phase and the data writing phase, the initialization phase is before the compensation phase, and the threshold voltage adjustment phase is before the compensation phase;

[0018] Optionally, the control end of the voltage writing module is connected to the first scanning signal line, the control end of the first initialization module is connected to the second scanning signal line, and the control end of the compensation module is connected to the third scanning signal line;

[0019] Optionally, the pixel circuit further includes a storage module, and the storage module is connected between the first control terminal of the driving module and the second power line;

[0020] Optionally, the driving module includes a first transistor, the compensation module includes a second transistor, the voltage writing module includes a third transistor, the coupling module includes a first capacitor, the first initialization module includes a fourth transistor, and the storage module includes a second capacitor; the gate of the third transistor is connected to the first scanning signal line, the first electrode of the third transistor is connected to the data line, the second electrode of the third transistor is connected to the first node, the gate of the fourth transistor is connected to the second scanning signal line, the first electrode of the fourth transistor is connected to the first node, the second electrode of the fourth transistor is connected to the first gate of the first transistor, the gate of the second transistor is connected to the third scanning signal line, the first electrode of the second transistor is connected to the first gate of the first transistor, the second electrode of the second transistor is connected to the first electrode of the first transistor, the second electrode of the first transistor is connected to the second power line, the second gate of the first transistor is connected to the first voltage signal line, the first electrode of the second capacitor is connected to the first gate of the first transistor, and the second electrode of the second capacitor is connected to the second power line.

[0021] Optionally, in a display cycle, the second scanning signal transmitted on the second scanning signal line and the third scanning signal transmitted on the third scanning signal line have the same waveform, the end time of the effective level of the second scanning signal is the same as the start time of the effective level of the third scanning signal, or the end time of the effective level of the second scanning signal is earlier than the start time of the effective level of the third scanning signal;

[0022] Preferably, the second scanning signal and the third scanning signal are generated by the same group of gate driving circuits;

[0023] Preferably, the second scanning signal is generated by the nth gate driving circuit, the third scanning signal is generated by the n+1th gate driving circuit, the nth gate driving circuit and the n+1th gate driving circuit are in the same group; n is an integer greater than or equal to 1.

[0024] Optionally, the pixel circuit further includes a second initialization module, the second initialization module is connected between the initialization signal line and the second end of the light emitting module, the second initialization module is used to transmit a second initialization voltage on the initialization signal line to the second end of the light emitting module during an initialization phase, and the first end of the light emitting module is connected to the first power line;

[0025] Preferably, the first power line is multiplexed as the initialization signal line, and the first power voltage transmitted on the first power line is multiplexed as the second initialization voltage;

[0026] Preferably, the second initialization module comprises a sixth transistor, a gate of the sixth transistor is connected to the first scanning signal line, a first electrode of the sixth transistor is connected to the initialization signal line, and a second electrode of the sixth transistor is connected to the second end of the light emitting module.

[0027] Optionally, the driving module further includes a second control terminal, the second control terminal of the driving module is connected to the first voltage signal line, the second terminal of the driving module is connected to the second power line, and the driving module is further used to adjust its own threshold voltage according to the difference between the first voltage transmitted on the first voltage signal line and the second power voltage transmitted on the second power line;

[0028] According to another aspect of the present invention, a driving method of a pixel circuit is provided, wherein the pixel circuit comprises a driving module, a voltage writing module, a coupling module and a light emitting module, wherein the voltage writing module and the coupling module are connected to a first node; the driving method of the pixel circuit comprises:

[0029] In the threshold voltage adjustment stage, the driving module is controlled to adjust its own threshold voltage according to the first voltage transmitted on the first voltage signal line connected to the second control terminal thereof;

[0030] In the data writing phase, the voltage writing module is controlled to transmit the data voltage to the first node, and the voltage information associated with the data voltage is written to the first control terminal of the driving module through the coupling module;

[0031] In the light-emitting stage, the driving module is controlled to drive the light-emitting module to emit light.

[0032] Optionally, the pixel circuit further includes a first initialization module and a compensation module, and the voltage writing module is connected to a data line; and the driving method of the pixel circuit further includes:

[0033] In the initialization stage, the data line is controlled to transmit the first initialization voltage, the voltage writing module is controlled to transmit the first initialization voltage to the first node, and the first initialization module is controlled to transmit the first initialization voltage on the first node to the first control terminal of the driving module;

[0034] Optionally, in the compensation stage, the compensation module is controlled to discharge the first control terminal of the driving module through the driving module until the driving module is turned off, so as to achieve compensation for the threshold voltage of the driving module;

[0035] Optionally, in the data writing stage, the control voltage writing module transmits the data voltage to the first node, and writes the voltage information associated with the data voltage to the first control terminal of the driving module through the coupling module, including:

[0036] In the data writing phase, the data line is controlled to transmit the data voltage, the voltage writing module is controlled to transmit the data voltage to the first node, and the voltage information associated with the data voltage is coupled to the first control terminal of the driving module through the coupling module;

[0037] Wherein, in a display cycle, the threshold voltage adjustment phase is located before the compensation phase.

[0038] Optionally, the pixel circuit further includes a light emitting control module, and the light emitting control module is connected between the light emitting module and the driving module;

[0039] Optionally, in the light emitting stage, controlling the driving module to drive the light emitting module to emit light includes:

[0040] In the light-emitting stage, the light-emitting control module is controlled to be turned on, and the driving module generates a driving current according to the voltages of the first control terminal and the second terminal thereof, so as to drive the light-emitting module to emit light;

[0041] Optionally, the pixel circuit further includes a second initialization module, wherein the second initialization module is connected between the initialization signal line and the second end of the light emitting module; and the driving method of the pixel circuit further includes:

[0042] In the initialization stage, the second initialization module is controlled to transmit the second initialization voltage on the initialization signal line to the second end of the light emitting module.

[0043] According to another aspect of the present invention, a display panel is provided. The display panel includes the pixel circuit provided by any embodiment of the present invention.

[0044] The technical solution provided by the embodiment of the present invention can adjust the threshold voltage of the driving module by applying the first voltage to the second control terminal of the driving module, which is beneficial to improving the uniformity of the driving current generated by the driving module. In addition, by coupling the data voltage to the first control terminal of the driving module through the coupling module, the dependence of the data voltage on the characteristics of the driving module can be reduced, which is beneficial to reducing the signal error caused by the change of parameters such as the threshold voltage drift and mobility of the driving module, and is beneficial to improving the accuracy of data voltage writing, thereby improving the display effect.

[0045] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 A schematic diagram of the structure of a pixel circuit provided by an embodiment of the present invention;

[0048] Figure 2 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0049] Figure 3 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0050] Figure 4 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0051] Figure 5 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0052] Figure 6 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention;

[0053] Figure 7 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0054] Figure 8 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0055] Fig. 9A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0056] Fig.10 A flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention;

[0057] Fig.11 A flowchart of another method for driving a pixel circuit provided by an embodiment of the present invention;

[0058] Fig.12 A schematic structural diagram of another display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0059] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0060] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0061] Figure 1 A schematic diagram of a pixel circuit according to an embodiment of the present invention is provided. Figure 1The pixel circuit provided in this embodiment includes a driving module 110, a voltage writing module 1201, a coupling module 1202 and a light-emitting module 150. The first ends of the voltage writing module 1201 and the coupling module 1202 are connected to the first node N1, and the second end of the coupling module 1202 is connected to the first control end of the driving module 110. The voltage writing module 1201 is used to transmit the data voltage Vdata to the first node N1, and write the voltage information associated with the data voltage Vdata to the first control end of the driving module 110 through the coupling module 1202; the second control end of the driving module 110 is connected to the first voltage signal line, and the driving module 110 is used to adjust its own threshold voltage according to the first voltage V1 transmitted on the first voltage signal line; the driving module 110 and the light-emitting module 150 are connected between the first power line L1 and the second power line L2, and the driving module 110 is used to drive the light-emitting module 150 to emit light in the light-emitting stage.

[0062] The first power line L1 may be used to transmit a first power voltage VDD, and the second power line L1 may be used to transmit a second power voltage VSS. The first power voltage VDD may be a positive voltage, and the second power voltage VSS may be a negative voltage.

[0063] Before writing the data voltage Vdata to the first control terminal of the driving module 110, the voltage of the second control terminal of the driving module 110 is adjusted by the first voltage V1 transmitted on the first voltage signal line, thereby adjusting the threshold voltage of the driving module 110, thereby improving the consistency of the driving current generated by the driving module 110. For example, if the threshold voltage of the driving module 110 is a positive value, and if the threshold voltage of the driving module 110 is a negative value due to process reasons, before writing the data voltage Vdata to the first control terminal of the driving module 110, the threshold voltage thereof can be adjusted to a positive value by the first voltage V1 to ensure that the driving module can work normally.

[0064] In the data writing stage, the voltage writing module 1201 writes the data voltage Vdata to the first node N1, and the coupling module 1202 couples the voltage change of the first node N1 to its second end, that is, the first control end of the driving module 110 is written with the voltage associated with the data voltage Vdata.

[0065] In the light-emitting stage, the driving module 110 generates a corresponding driving current according to the voltage of its first control terminal to drive the light-emitting module 150 to emit light.

[0066] The technical solution provided by the embodiment of the present invention can adjust the threshold voltage of the driving module 110 by applying the first voltage V1 to the second control terminal of the driving module 110, which is beneficial to improving the uniformity of the driving current generated by the driving module 110. In addition, by coupling the data voltage Vdata to the first control terminal of the driving module 110 through the coupling module 1202, the dependence of the data voltage Vdata on the characteristics of the driving module 110 can be reduced, which is beneficial to reducing the signal error caused by the change of parameters such as the threshold voltage drift and mobility of the driving module 110, and is beneficial to improving the accuracy of writing the data voltage Vdata, thereby improving the display effect.

[0067] Continue to refer Figure 1 The pixel circuit further includes a light-emitting control module 160, a control end of the light-emitting control module 160 is connected to a light-emitting control signal line, the light-emitting control signal line is used to transmit a light-emitting control signal EM, a first end of the light-emitting control module 160 is connected to a second end of the light-emitting module 150, a second end of the light-emitting control module 160 is connected to a first end of the driving module 110, and a second end of the driving module 110 is connected to a second power line L2. By providing the light-emitting control module 160, the light-emitting module 150 is prevented from being secretly lit in the non-light-emitting stage.

[0068] In this embodiment, the first end of the light emitting module 150 is connected to the first power line L1. By using the inverted light emitting module 150, the voltage drop of the first power supply voltage VDD on the first power line L1 can be reduced, ensuring that the voltage across the light emitting module 150 remains stable, which is conducive to improving display uniformity.

[0069] Figure 2 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 2 On the basis of the above embodiment, optionally, the pixel circuit further includes a first initialization module 130, a first end of the first initialization module 130 is connected to the first node N1, a second end of the first initialization module 130 is connected to the first control end of the driving module 110, a voltage writing module 1201 is used to transmit the first initialization voltage Vref1 to the first node N1 in the initialization stage, and transmit the data voltage Vdata to the first node N1 in the data writing stage, and the first initialization module 130 is used to transmit the first initialization voltage Vref1 on the first node N1 to the first control end of the driving module 110 in the initialization stage.

[0070] Specifically, in the initialization stage, the voltage writing module 1201 transmits the first initialization voltage Vref1 to the first node N1 to initialize the first node N1 and ensure the smooth writing of the subsequent data voltage Vdata. The voltage on the first node N1 is transmitted to the first control terminal of the driving module 110 via the first initialization module 130 to realize the initialization of the first control terminal of the driving module 110, that is, the voltages of the first node N1 and the first control terminal of the driving module 110 are both the first initialization voltage Vref1. In the data writing stage, the voltage writing module 1201 transmits the data voltage Vdata to the first node N1, and the coupling module 1202 couples the voltage change of the first node N1 to the first control terminal of the driving module 110 to realize data writing.

[0071] Continue to refer Figure 2 Optionally, the pixel circuit provided in this embodiment further includes a compensation module 140, which is connected between the first control terminal and the first terminal of the driving module 110, and the compensation module 140 is used to compensate for the threshold voltage of the driving module 110 during the compensation stage.

[0072] The first control terminal of the driving module 110 writes the first initialization voltage Vref1 and the data voltage Vdata in a time-sharing manner. Figure 2 Taking the pixel circuit shown in FIG. 1 as an example, the working process of the pixel circuit includes an initialization stage, a compensation stage, a data writing stage and a light emitting stage. In the initialization stage, the first initialization voltage Vref1 is transmitted to the first node N1 via the voltage writing module 1201, and is transmitted to the first control terminal of the driving module 110 via the first initialization module 130, so as to initialize the potential of the first node N1 and the first control terminal of the driving module 110.

[0073] In the compensation stage, under the action of the first initialization voltage Vref1, the driving module 110 generates a current flowing from its first control terminal to the second terminal, and discharges the first control terminal of the driving module 110 until the voltage difference between the first control terminal and the second terminal of the driving module 110 is equal to the threshold voltage of the driving module 110, and then the driving module 110 is turned off. At this time, the voltage of the first control terminal of the driving module 110 is associated with its threshold voltage, and the threshold voltage compensation of the driving module 110 is achieved.

[0074] In the data writing stage, the voltage writing module 1201 transmits the data voltage Vdata to the first node N1, and the coupling module 1202 couples the voltage variation of the first node N1 to the first control terminal of the driving module 110 to implement data writing.

[0075] In the light-emitting stage, the control driving module 110 drives the light-emitting module 150 to emit light according to the voltage of the first control terminal thereof.

[0076] The technical solution provided by the embodiment of the present invention separates the process of compensating the threshold voltage of the driving module 110 from the process of writing data to the driving module 110, so that the threshold compensation stage and the data writing stage do not affect each other, thereby making the threshold compensation time unaffected by the data writing stage, so that the threshold voltage of the driving module 110 can be fully compensated, which is beneficial to improving the uniformity of display quality and improving the display effect.

[0077] Figure 3 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 3 On the basis of the above embodiment, optionally, the voltage writing module 1201 is connected to the data line DL, and the data line DL is configured to transmit the first initialization voltage Vref1 in the initialization stage, and transmit the data voltage Vdata in the data writing stage. That is to say, the first initialization voltage Vref1 and the data voltage Vdata share the data line DL, and the data line DL transmits the first initialization voltage Vref1 and the data voltage Vdata in a time-sharing manner, which is conducive to reducing the number of signal lines, thereby improving the screen transmittance.

[0078] In this embodiment, in a display cycle, the compensation phase is between the initialization phase and the data writing phase, and the initialization phase is before the compensation phase. By separating the compensation phase from the data writing phase, the threshold voltage of the driving module 110 is compensated before the data voltage Vdata is written to the first control terminal of the driving module 110, so that the threshold compensation phase and the data writing phase do not affect each other, so that the time of the threshold compensation is not affected by the data writing phase, and even at a high refresh rate, the threshold voltage of the driving module 110 can be fully compensated, so that the difference in the characteristics of the driving module 110 corresponding to different pixels can be reduced, which is conducive to improving the difference in display brightness, improving the uniformity of display quality, and improving the display effect.

[0079] Optionally, the working process of the pixel circuit provided in this embodiment further includes a threshold voltage adjustment stage, in which the driving module 110 can adjust its own threshold voltage according to the difference between the first voltage V1 transmitted on the first voltage signal line and the second power supply voltage VSS transmitted on the second power supply line L2. The threshold voltage adjustment stage is located before the compensation stage to avoid interference with the threshold voltage compensation of the driving module 110. For example, the threshold voltage adjustment stage can be located between the initialization stage and the compensation stage, or before the initialization stage.

[0080] Specifically, by applying the first voltage V1 to the second control terminal of the driving module 110, the threshold voltage of the driving module 110 can be adjusted, which is beneficial to expand the compensation range of the threshold voltage. Exemplarily, the transistor included in the driving module 110 is an N-type transistor, and under normal circumstances, its threshold voltage is greater than 0V. During actual point-to-screen operation, if the threshold voltage of the transistor included in the driving module 110 drifts and is less than 0V, the first voltage V1 can be applied to the second control terminal of the driving module 110, and the threshold voltage thereof is adjusted to be greater than 0V by the difference between the first voltage V1 and the second power supply voltage VSS, so that both positive and negative threshold voltages of the driving module 110 can be compensated, thereby increasing the compensation range and facilitating improving display uniformity.

[0081] The smaller the difference between the first voltage V1 and the second power supply voltage VSS is (including negative values), the stronger the ability to adjust the threshold voltage is. For example, the first voltage V1 is a negative voltage. When a voltage is applied to the first control terminal of the driving module 110, the driving module 110 will generate a conduction current. Applying a negative voltage to its second control terminal will suppress the conduction current, thereby preventing the cross-sectional area of ​​the conductive channel from increasing, so that its threshold voltage is positively biased.

[0082] Optionally, the first voltage V1 is an adjustable voltage, so that different adjustments can be made according to actual needs, so that the threshold voltage of the driving module 110 can be compensated in both positive and negative cases, so as to meet the compensation requirements of the driving module 110 .

[0083] Optionally, the first voltage V1 is a global signal, and the second control terminals of the driving modules 110 in all pixel circuits are connected to the first voltage signal line. When the screen is dotted, the difference between the first voltage V1 and the second power supply voltage VSS controls the threshold voltages of all driving modules 110 to be greater than 0V.

[0084] Optionally, the control end of the first initialization module 130 is connected to the second scan signal line, and is used to respond to the second scan signal S2 transmitted by the second scan signal line to be turned on during the initialization phase. The control end of the compensation module 140 is connected to the third scan signal line, and is used to respond to the third scan signal S3 transmitted by the third scan signal line to be turned on during the compensation phase.

[0085] Continue to refer Figure 3 The pixel circuit provided in this embodiment further includes a storage module 170 for storing the voltage of the first control terminal of the driving module 110 .

[0086] Figure 4 A schematic diagram of another pixel circuit structure provided by an embodiment of the present invention, specifically: Figure 3 The pixel circuit shown is refined into a schematic diagram of the device structure, refer to Figure 4The driving module 110 includes a first transistor M1, the compensation module 140 includes a second transistor M2, the voltage writing module 1201 includes a third transistor M3, the coupling module 1203 includes a first capacitor C1, and the first initialization module 130 includes a fourth transistor M4; the gate of the third transistor M3 is connected to the first scanning signal line, the first electrode of the third transistor M3 is connected to the data line DL, the second electrode of the third transistor M3 is connected to the first node N1, the gate of the fourth transistor M4 is connected to the second scanning signal line, the first electrode of the fourth transistor M4 is connected to the first node N1, the second electrode of the fourth transistor M4 is connected to the first gate G1 of the first transistor M1, the gate of the second transistor M2 is connected to the third scanning signal line, the first electrode of the second transistor M2 is connected to the first gate G1 of the first transistor M1, the second electrode of the second transistor M2 is connected to the first electrode of the first transistor M1, and the second electrode of the first transistor M1 is connected to the second power line L2. The light emitting module 150 includes a light emitting diode D1, and the light emitting control module 160 includes a fifth transistor M5. The first electrode of the light emitting diode D1 is connected to the first power line L1, the second electrode of the light emitting diode D1 is connected to the first electrode of the fifth transistor M5, the second electrode of the fifth transistor M5 is connected to the first end of the driving module 110, and the gate of the fifth transistor M5 is connected to the light emitting control signal line. The storage module 170 includes a second capacitor C2, the first electrode of the second capacitor C2 is connected to the first control end of the driving module 110, and the second electrode of the second capacitor C2 is connected to the second power line L2. Among them, the first electrode of the light emitting diode D1 can be an anode, and the second electrode of the light emitting diode D2 can be a cathode.

[0087] Among them, the first transistor M1 is an N-type vertical dual-gate transistor, the first gate G1 of the first transistor M1 serves as the first control terminal of the driving module 110, the second gate G2 of the first transistor M1 serves as the second control terminal of the driving module 110, the second gate G2 of the first transistor M1 is connected to the first voltage signal line, and the second gate G2 of the first transistor M1 is used to adjust the threshold voltage of the first transistor M1 to a positive value according to the difference between the first voltage V1 and the second power supply voltage VSS.

[0088] Optionally, the first gate G1 of the first transistor M1 is a top gate, and the second gate G2 of the first transistor M1 is a bottom gate. Alternatively, the second gate G2 of the first transistor M1 is a top gate, and the first gate G1 of the first transistor M1 is a bottom gate.

[0089] Figure 5 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention can be applied to Figure 4 The pixel circuit shown in the figure takes the case that each transistor is an N-type transistor. The transistor is turned on when the voltage level is high and turned off when the voltage level is low. Figure 4 and Figure 5The working process of the pixel circuit provided in this embodiment includes an initialization stage T1, a compensation stage, a data writing stage T3 and a light emitting stage T4.

[0090] Before the initialization stage T1 (or the compensation stage T2 ), the threshold voltage of the first transistor M1 may be regulated by the first voltage V1 , so that the threshold voltage of the first transistor M1 is a positive value.

[0091] In the initialization stage T1, the first scanning signal S1 is at a high level, the second scanning signal S2 is at a high level, the third scanning signal S3 is at a low level, and the light emitting control signal EM is at a low level. Therefore, the third transistor M3 and the fourth transistor M4 are turned on. The first initialization voltage Vref1 is transmitted on the data line DL, and the first initialization voltage Vref1 is transmitted to the first node N1 through the third transistor M3, and continues to be transmitted to the first gate G1 of the first transistor M1 through the fourth transistor M4, so as to initialize the first node N1 and the first gate G1 of the first transistor M1, and turn on the first transistor M1.

[0092] In the compensation stage T2, the first scanning signal S1 is at a high level, the second scanning signal S2 is at a low level, the third scanning signal S3 is at a high level, and the light-emitting control signal EM is at a low level. Therefore, the second transistor M2 and the third transistor M3 are turned on, and the first initialization voltage Vref1 is transmitted to the first node N1 via the third transistor M3 to maintain the potential of the first electrode of the first capacitor C1. The voltage of the first gate G1 of the first transistor M1 is discharged via the second transistor M2 and the first transistor M1. When the voltage of the first gate G1 of the first transistor M1 drops to VSS+Vth1, the first transistor M1 is turned off. At this time, the voltage of the first gate G1 of the first transistor M1 is associated with its own threshold voltage Vth1, thereby achieving threshold voltage compensation. Wherein, Vth1 is the threshold voltage of the first transistor M1.

[0093] In the data writing stage T3, the first scanning signal S1 is at a high level, the second scanning signal S2 is at a low level, the third scanning signal S3 is at a low level, and the light emitting control signal EM is at a low level. Therefore, the third transistor M3 is turned on. At this time, the data line DL transmits the data voltage Vdata, and the data voltage Vdata is transmitted to the first node N1 through the third transistor M3. The voltage of the first electrode of the first capacitor C1 jumps from the first initialization voltage Vref1 to the data voltage Vdata. Under the coupling effect of the first capacitor C1, the voltage of the first gate G1 of the first transistor M1 becomes VSS+Vth1+c1*(Vdata-Vref1) / (c1+c2), and is stored on the second capacitor C2. Wherein, c1 is the capacitance of the first capacitor C1, and c2 is the capacitance of the second capacitor C2.

[0094] Optionally, when the third scanning signal S3 jumps from the on level (high level) to the off level (low level), it will produce a coupling effect on the first gate G1 of the first transistor M1, pull down the voltage of the first gate G1 of the first transistor M1, and promote the first gate G1 of the first transistor M1 to maintain a low potential. It will not cause the loss of threshold voltage compensation, and eliminate the problem of gate voltage loss of the driving transistor (first transistor M1) due to potential coupling in the prior art.

[0095] In the light-emitting stage T4, the first scanning signal S1 is at a low level, the second scanning signal S2 is at a low level, the third scanning signal S3 is at a low level, and the light-emitting control signal EM is at a high level. Therefore, the fifth transistor M5 is turned on. The first transistor M1 generates a driving current I according to the voltage of its first gate G1, driving the light-emitting diode D1 to emit light. The driving current I can be expressed as:

[0096]

[0097] Wherein, μ is the electron mobility of the first transistor M1, Cox is the channel capacitance per unit area of ​​the first transistor M1, W / L is the width-to-length ratio of the first transistor M1, Vth1 is the threshold voltage of the first transistor M1, c1 is the capacitance value of the first capacitor C1, and c2 is the capacitance value of the second capacitor C2.

[0098] According to the formula of the driving current I, the driving current I has nothing to do with the first power supply voltage VDD, the second power supply voltage VSS, and the threshold voltage Vth1 of the first transistor M1. Therefore, the pixel circuit provided in this embodiment can compensate for the display unevenness problem caused by the threshold voltage Vth1 of the first transistor M1, the voltage drop (IR drop) of the first power supply voltage VDD, and the voltage drop of the second power supply voltage VSS, which is beneficial to improving the display quality. Moreover, the time of threshold voltage compensation is not affected by the data writing stage, and the compensation time can be adjusted in real time, and the threshold voltage fluctuating in a large range can be compensated.

[0099] Optionally, in other embodiments, transistors other than the first transistor M1 may also be P-type transistors, and their scan signals are correspondingly modified to be turned on by a low level and turned off by a high level, and the specific working process is the same as above.

[0100] Optionally, continue to refer to Figure 4 and Figure 5, within a display cycle, the waveforms of the second scanning signal S2 transmitted on the second scanning signal line and the third scanning signal S3 transmitted on the third scanning signal line are the same, the end time of the effective level of the second scanning signal S2 is the same as the start time of the effective level of the third scanning signal S3, or the end time of the effective level of the second scanning signal S2 is earlier than the start time of the effective level of the third scanning signal S3, so as to ensure that the compensation stage T2 is located after the initialization stage T1.

[0101] Since the second scan signal S2 and the third scan signal S3 have the same waveform, the second scan signal S2 and the third scan signal S3 can be generated by the same gate driving circuit.

[0102] Figure 6 A schematic diagram of a display panel according to an embodiment of the present invention is provided. Figure 6 The display panel 210 has a display area AA and a non-display area NA arranged around the display area AA. The display panel 210 includes a gate driving circuit 220 and an array-arranged pixel circuit 230. The pixel circuit 230 is located in the display area AA, and the gate driving circuit 220 is located in the non-display area NA. The second scanning signal S2 is generated by the n-th gate driving circuit, and the third scanning signal S3 is generated by the n+1-th gate driving circuit. The n-th gate driving circuit and the n+1-th gate driving circuit are in the same group; n is an integer greater than or equal to 1. Exemplarily, the first-stage gate driving circuit G1 generates the second scanning signal S2-1 for the first row of pixel circuits 230, the second-stage gate driving circuit G2 generates the third scanning signal S3-1 for the first row of pixel circuits 230, and the second-stage gate driving circuit G2 also generates the second scanning signal S2-2 for the second row of pixel circuits 230. The third-stage gate driving circuit G3 generates the third scanning signal S3-2 for the second-row pixel circuit 230, and the third-stage gate driving circuit G3 also generates the second scanning signal S2-3 for the third-row pixel circuit 230. The fourth-stage gate driving circuit G4 generates the third scanning signal S3-3 for the third-row pixel circuit 230, and the fourth-stage gate driving circuit G4 also generates the second scanning signal S2-4 for the fourth-row pixel circuit 230… and so on, until the last-stage gate driving circuit generates the third scanning signal S3 for the last-row pixel circuit 230.

[0103] In this embodiment, the first scanning signal S1 is generated by a group of gate driving circuits, the second scanning signal S2 and the third scanning signal S3 are generated by a group of gate driving circuits, and the light-emitting control signal EM is generated by a group of gate driving circuits. Therefore, the pixel circuit provided in this embodiment only requires 3 groups of gate driving circuits to complete the driving, which is beneficial to reducing the border width and improving PPI.

[0104] Figure 7A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 7 The pixel circuit provided in this embodiment further includes a second initialization module 180, which is connected between the initialization signal line L3 and the second end of the light emitting module 160. The second initialization module 180 is used to transmit the second initialization voltage Vref2 on the initialization signal line L3 to the second end of the light emitting module 150 during the initialization phase. The control end of the second initialization module 180 can be connected to the first scanning signal line to save the number of signal lines.

[0105] Figure 8 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 8 The second initialization module 180 includes a sixth transistor M6, a gate of the sixth transistor M6 is connected to the first scanning signal line, a first electrode of the sixth transistor M6 is connected to the initialization signal line L3, and a second electrode of the sixth transistor M6 is connected to the second end of the light emitting module 150. Figure 8 The pixel circuit shown is also applicable to Figure 5 As shown in the driving timing, in the initialization stage T1, while the first gate G1 of the first transistor M1 is initialized by the first initialization voltage Vref1, the second initialization voltage Vref2 is transmitted to the second electrode of the light-emitting diode D1 through the sixth transistor M6 to initialize the second electrode of the light-emitting diode D1. The working process of other stages is the same as Figure 4 The working process of the pixel circuit shown is the same and will not be repeated here.

[0106] In this embodiment, the second pole of the light-emitting diode D1 is initialized by using an independently set second initialization voltage Vref2. Therefore, the voltage across the light-emitting diode D1 can be close to the start-up voltage while ensuring that the light-emitting diode D1 does not emit light during the initialization stage. During the light-emitting stage, the voltage across the second pole of the light-emitting diode D1 can be quickly charged to a predetermined voltage so that the voltage across the light-emitting diode D1 is greater than or equal to the start-up voltage, thereby improving the brightness of the first frame, especially significantly improving the brightness of the first frame under low grayscale.

[0107] Optionally, the second initialization voltage Vref2 is an adjustable voltage. For different pixel circuits or different display panels, the second initialization voltage Vref2 can be adjusted to different voltage values. In this embodiment, the second initialization voltage Vref2 takes the maximum voltage when not emitting light in the black state as the optimal voltage to ensure that the voltage difference of the light-emitting diode D1 is at the critical value of lighting.

[0108] Fig. 9 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig. 9On the basis of the above embodiments, optionally, the first power line L1 is multiplexed as the initialization signal line L3, and the first power supply voltage VDD transmitted on the first power line L1 is multiplexed as the second initialization voltage Vref2 to save the number of signal lines, and the second end of the light-emitting module 150 can also be initialized.

[0109] Optionally, an embodiment of the present invention further provides a method for driving a pixel circuit, where the method is used to drive the pixel circuit provided by any of the above embodiments. Fig.10 A flowchart of a driving method for a pixel circuit provided by an embodiment of the present invention, combined with Figure 1 and Fig.10 , the driving method of the pixel circuit provided in this embodiment includes:

[0110] S110 , in the threshold voltage adjustment stage, the control driving module adjusts its own threshold voltage according to the first voltage transmitted on the first voltage signal line connected to the second control terminal thereof.

[0111] S120 , in the data writing phase, the control voltage writing module transmits the data voltage to the first node, and writes the voltage information associated with the data voltage to the first control terminal of the driving module through the coupling module.

[0112] S130 , in the light-emitting stage, controlling the driving module to drive the light-emitting module to emit light.

[0113] The technical solution provided by the embodiment of the present invention separates the process of compensating the threshold voltage of the driving module from the process of writing data to the driving module, so that the threshold compensation stage and the data writing stage do not affect each other, thereby making the threshold compensation time unaffected by the data writing stage, so that the threshold voltage of the driving module can be fully compensated, which is beneficial to improving the uniformity of display quality and improving the display effect.

[0114] Fig.11 A flowchart of another pixel circuit driving method provided by an embodiment of the present invention, referring to Figure 3 and Fig.11 , the driving method of the pixel circuit provided in this embodiment includes:

[0115] S1101, in the initialization stage, controlling the data line to transmit a first initialization voltage, controlling the voltage writing module to transmit the first initialization voltage to the first node, and controlling the first initialization module to transmit the first initialization voltage on the first node to the first control terminal of the driving module.

[0116] S210 , in the compensation stage, controlling the compensation module to discharge the first control terminal of the driving module through the driving module until the driving module is turned off, thereby achieving compensation for the threshold voltage of the driving module.

[0117] S1201. In the data writing phase, the data line is controlled to transmit a data voltage, a voltage writing module is controlled to transmit the data voltage to a first node, and voltage information associated with the data voltage is coupled to a first control terminal of a driving module through a coupling module.

[0118] S1301, in the light-emitting stage, the light-emitting control module is controlled to be turned on, and the driving module generates a driving current according to the voltages of the first control terminal and the second terminal thereof, so as to drive the light-emitting module to emit light.

[0119] The specific working process of the driving method of the pixel circuit can refer to the above embodiment. Figure 3-Figure 5 The relevant description is not repeated here.

[0120] Optionally, combined Figure 7 , the driving method of the pixel circuit provided by the embodiment of the present invention further includes:

[0121] In the initialization stage, the second initialization module 180 is controlled to transmit the second initialization voltage Vref2 on the initialization signal line L3 to the second end of the light emitting module 150 .

[0122] Optionally, the driving method of the pixel circuit provided in this embodiment further includes:

[0123] Before the compensation phase, the control driving module 110 adjusts its threshold voltage to a positive value according to the first voltage V1 transmitted on the first voltage signal line.

[0124] The process of controlling the driving module 110 to adjust its threshold voltage to a positive value may be located at the start stage of a display cycle, such as before the initialization stage; or between the initialization stage and the compensation stage, and may be flexibly set according to actual needs.

[0125] Optionally, an embodiment of the present invention further provides a display panel, comprising the pixel circuit provided by the above embodiment, so the display panel also has the beneficial effects described in any of the above embodiments. Fig.12 A schematic diagram of the structure of another display panel provided in an embodiment of the present invention. In this embodiment, the display panel 210 can be applied to a mobile phone, and can also be applied to any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, medical equipment, industrial control equipment, touch interactive terminals, etc. The embodiment of the present invention does not make any special limitations on this.

[0126] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0127] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pixel circuit, characterized in that: include: Driving module, voltage writing module, coupling module and light emitting module; The voltage writing module and the first end of the coupling module are connected to a first node, the second end of the coupling module is connected to the first control end of the driving module, the voltage writing module is used to transmit the data voltage to the first node, and write the voltage information associated with the data voltage to the first control end of the driving module through the coupling module; The second control end of the driving module is connected to the first voltage signal line, and the driving module is used to adjust its own threshold voltage according to the first voltage transmitted on the first voltage signal line; The driving module and the light emitting module are connected between a first power line and a second power line, and the driving module is further used to drive the light emitting module to emit light in a light emitting stage.

2. The pixel circuit according to claim 1, characterized in that: The pixel circuit further comprises a light emitting control module, wherein a control end of the light emitting control module is connected to a light emitting control signal line, a first end of the light emitting control module is connected to a second end of the light emitting module, a second end of the light emitting control module is connected to a first end of the driving module, a second end of the driving module is connected to the second power line, and a first end of the light emitting module is connected to the first power line; Preferably, the driving module includes a first transistor, the light emitting control module includes a fifth transistor, the light emitting module includes a light emitting diode, a first electrode of the light emitting diode is connected to the first power line, a second electrode of the light emitting diode is connected to a first electrode of the fifth transistor, a second electrode of the fifth transistor is connected to a first electrode of the first transistor, a second electrode of the first transistor is connected to the second power line, a gate of the fifth transistor is connected to the light emitting control signal line, a first gate of the first transistor is connected to the second end of the coupling module, and a second gate of the first transistor is connected to the first voltage signal line; Preferably, the first transistor is an N-type transistor, and the first transistor is used to adjust the threshold voltage of the first transistor to a positive value according to the difference between the first voltage and the second power supply voltage transmitted on the second power supply line; Preferably, the first gate of the first transistor is a top gate, and the second gate of the first transistor is a bottom gate, or the second gate of the first transistor is a top gate, and the first gate of the first transistor is a bottom gate.

3. The pixel circuit according to claim 1, characterized in that: The pixel circuit further comprises a first initialization module, a first end of the first initialization module is connected to the first node, a second end of the first initialization module is connected to the first control end of the driving module, the voltage writing module is used to transmit a first initialization voltage to the first node in an initialization phase, and transmit the data voltage to the first node in a data writing phase, and the first initialization module is used to transmit the first initialization voltage on the first node to the first control end of the driving module in the initialization phase; Preferably, a first end of the voltage writing module is connected to a data line, and the data line is configured to transmit the first initialization voltage in the initialization phase and transmit the data voltage in the data writing phase.

4. The pixel circuit according to claim 3, characterized in that: The pixel circuit further includes a compensation module, the compensation module is connected between the first control terminal and the first terminal of the driving module, and the compensation module is used to compensate for the threshold voltage of the driving module in the compensation stage; Preferably, the second end of the driving module is connected to the second power line, and the driving module is used to adjust its own threshold voltage according to the difference between the first voltage transmitted on the first voltage signal line and the second power voltage transmitted on the second power line during the threshold voltage adjustment stage; Preferably, in a display cycle, the compensation phase is between the initialization phase and the data writing phase, the initialization phase is before the compensation phase, and the threshold voltage adjustment phase is before the compensation phase; Preferably, the control end of the voltage writing module is connected to the first scanning signal line, the control end of the first initialization module is connected to the second scanning signal line, and the control end of the compensation module is connected to the third scanning signal line; Preferably, the pixel circuit further comprises a storage module, and the storage module is connected between the first control terminal of the driving module and the second power line; Preferably, the driving module includes a first transistor, the compensation module includes a second transistor, the voltage writing module includes a third transistor, the coupling module includes a first capacitor, the first initialization module includes a fourth transistor, and the storage module includes a second capacitor; the gate of the third transistor is connected to the first scanning signal line, the first electrode of the third transistor is connected to the data line, the second electrode of the third transistor is connected to the first node, the gate of the fourth transistor is connected to the second scanning signal line, the first electrode of the fourth transistor is connected to the first node, the second electrode of the fourth transistor is connected to the first gate of the first transistor, the gate of the second transistor is connected to the third scanning signal line, the first electrode of the second transistor is connected to the first gate of the first transistor, the second electrode of the second transistor is connected to the first electrode of the first transistor, the second electrode of the first transistor is connected to the second power line, the second gate of the first transistor is connected to the first voltage signal line, the first electrode of the second capacitor is connected to the first gate of the first transistor, and the second electrode of the second capacitor is connected to the second power line.

5. The pixel circuit according to claim 4, characterized in that: In a display cycle, the waveforms of the second scanning signal transmitted on the second scanning signal line and the third scanning signal transmitted on the third scanning signal line are the same, the end time of the effective level of the second scanning signal is the same as the start time of the effective level of the third scanning signal, or the end time of the effective level of the second scanning signal is earlier than the start time of the effective level of the third scanning signal; Preferably, the second scanning signal and the third scanning signal are generated by the same group of gate driving circuits; Preferably, the second scanning signal is generated by the nth stage gate driving circuit, the third scanning signal is generated by the n+1th stage gate driving circuit, and the nth stage gate driving circuit and the n+1th stage gate driving circuit are in the same group; n is an integer greater than or equal to 1.

6. The pixel circuit according to claim 1, characterized in that: The pixel circuit further includes a second initialization module, which is connected between the initialization signal line and the second end of the light-emitting module, and is used to transmit a second initialization voltage on the initialization signal line to the second end of the light-emitting module during the initialization phase, and the first end of the light-emitting module is connected to the first power line; Preferably, the first power line is multiplexed as the initialization signal line, and the first power voltage transmitted on the first power line is multiplexed as the second initialization voltage; Preferably, the second initialization module comprises a sixth transistor, a gate of the sixth transistor is connected to the first scanning signal line, a first electrode of the sixth transistor is connected to the initialization signal line, and a second electrode of the sixth transistor is connected to the second end of the light emitting module.

7. A method for driving a pixel circuit, characterized in that: The pixel circuit comprises a driving module, a voltage writing module, a coupling module and a light emitting module, wherein the voltage writing module and the coupling module are connected to a first node; The driving method of the pixel circuit comprises: In the threshold voltage adjustment stage, the driving module is controlled to adjust its own threshold voltage according to the first voltage transmitted on the first voltage signal line connected to the second control terminal thereof; In the data writing phase, the voltage writing module is controlled to transmit the data voltage to the first node, and the voltage information associated with the data voltage is written to the first control terminal of the driving module through the coupling module; In the light-emitting stage, the driving module is controlled to drive the light-emitting module to emit light.

8. The driving method of the pixel circuit according to claim 7, characterized in that: The pixel circuit further includes a first initialization module and a compensation module, and the voltage writing module is connected to a data line; the driving method of the pixel circuit further includes: In the initialization stage, the data line is controlled to transmit the first initialization voltage, the voltage writing module is controlled to transmit the first initialization voltage to the first node, and the first initialization module is controlled to transmit the first initialization voltage on the first node to the first control terminal of the driving module; In the compensation stage, the compensation module is controlled to discharge the first control terminal of the driving module through the driving module until the driving module is turned off, so as to achieve compensation for the threshold voltage of the driving module; The step of controlling the voltage writing module to transmit the data voltage to the first node and writing the voltage information associated with the data voltage to the first control terminal of the driving module through the coupling module during the data writing phase comprises: during the data writing phase, controlling the data line to transmit the data voltage, controlling the voltage writing module to transmit the data voltage to the first node and coupling the voltage information associated with the data voltage to the first control terminal of the driving module through the coupling module; Wherein, in a display cycle, the threshold voltage adjustment phase is located before the compensation phase.

9. The driving method of the pixel circuit according to claim 8, characterized in that: The pixel circuit further includes a light emitting control module, and the light emitting control module is connected between the light emitting module and the driving module; In the light emitting stage, controlling the driving module to drive the light emitting module to emit light includes: In the light-emitting stage, the light-emitting control module is controlled to be turned on, and the driving module generates a driving current according to the voltages of the first control terminal and the second terminal thereof, so as to drive the light-emitting module to emit light; Preferably, the pixel circuit further comprises a second initialization module, wherein the second initialization module is connected between the initialization signal line and the second end of the light emitting module; The driving method of the pixel circuit further includes: In the initialization stage, the second initialization module is controlled to transmit the second initialization voltage on the initialization signal line to the second end of the light emitting module.

10. A display panel, characterized in that: The pixel circuit comprises the pixel circuit described in any one of claims 1 to 6.

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