Pixel circuit, driving method thereof and display panel

Abstract

The invention discloses a pixel circuit and a driving method thereof and a display panel, the pixel circuit comprises a time control module, a potential control module and a first coupling unit, the first control end of the potential control module is connected with the output end of the time control module, and the second control end of the potential control module is connected with a first light-emitting control signal line; the first power supply module is used for responding to the potential of the output end of the time control module and a first light-emitting control signal on a first light-emitting control signal line and outputting first power supply voltage or second power supply voltage; the first coupling unit is connected between the output end of the potential control module and the control end of the time control module, and the first coupling unit is used for controlling the potential of the control end of the time control module according to the potential of the output end of the potential control module so as to control the potential of the output end of the time control module. According to the scheme, the phenomenon of display color cast or non-uniform display caused by closing delay when the pixel circuit is closed can be improved, and the display effect can be 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 have higher and higher requirements on the display effects of display devices.

[0003] Display driving methods include PWM (Pulse Width Modulation), PAM (Pulse Amplitude Modulation) and a mixture of the two. Currently, in the existing PWM driving method or digital-analog hybrid driving method, there is a 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 display effect.

[0005] According to one aspect of the present invention, there is provided a pixel circuit, comprising:

[0006] A time control module, comprising a control end, a data writing end and an output end, wherein the time control module is used to write a first data signal connected to the data writing end to the control end in a first data writing phase, and to control the potential of its own output end according to the first data signal and the sweep signal in a light emitting phase, so as to control the light emitting time of the light emitting element;

[0007] A potential control module, comprising a first control end, a second control end, a first input end, a second input end and an output end, wherein the first control end of the potential control module is connected to the output end of the time control module, the second control end is connected to the first light-emitting control signal line, the first input end is connected to the first power line, and the second input end is connected to the second power line, and the potential control module is used to respond to the potential of the output end of the time control module and the first light-emitting control signal on the first light-emitting control signal line, and output a first power supply voltage on the first power line or a second power supply voltage on the second power line;

[0008] The first coupling unit includes a first end and a second end, wherein the first end is connected to the output end of the potential control module, and the second end is connected to the control end of the time control module, and the first coupling unit is used to control the potential of the control end of the time control module according to the potential of the output end of the potential control module to control the potential of the output end of the time control module.

[0009] According to another aspect of the present invention, a driving method of a pixel circuit is provided, wherein the pixel circuit comprises a time control module, a potential control module and a first coupling unit, wherein the time control module comprises a control end, a data writing end and an output end, wherein the potential control module comprises a first control end, a second control end, a first input end, a second input end and an output end, wherein the first control end of the potential control module is connected to the output end of the time control module, the second control end is connected to the first light-emitting control signal line, the first input end is connected to the first power line, the second input end is connected to the second power line, the first end of the first coupling unit is connected to the output end of the potential control module, and the second end of the first coupling unit is connected to the control end of the time control module;

[0010] The driving method of the pixel circuit comprises:

[0011] In the first data writing phase, controlling the time control module to connect the data writing end to the first data signal and write it into the control end;

[0012] In the light-emitting stage, the time control module is controlled to control the potential of its own output end according to the first data signal and the sweep signal to control the light-emitting time of the light-emitting element, and at the end of the light-emitting time, the potential control module is controlled to respond to the potential of the output end of the time control module and the first light-emitting control signal on the first light-emitting control signal line, output the first power supply voltage on the first power line or the second power supply voltage on the second power line to the first end of the first coupling unit, and control the potential of the control end of the time control module through the first coupling unit, thereby controlling the potential of the output end of the time control module.

[0013] 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.

[0014] The technical solution provided by the embodiment of the present invention is to associate the output end and the control end of the time control module by setting a potential control module and a first coupling unit between the output end and the control end of the time control module. When the light emission ends, the potential control module is controlled to respond to the potential of the output end of the time control module and the first light emission control signal on the first light emission control signal line to change the voltage of the first end of the first coupling unit (that is, the voltage of the output end of the potential control module), and synchronously change the voltage of the control end of the time control module through the first coupling unit, so that the time control module can quickly switch its on-off state, so that the voltage switching speed of the output end of the time control module is faster, so as to control the light emitting element to be extinguished quickly and reduce the duration of the end of the light emission, which is beneficial to improve the display color deviation or uneven display phenomenon caused by the shutdown delay when the pixel circuit is turned off, and is beneficial to improve the display effect.

[0015] 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

[0016] 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.

[0017] Figure 1 A schematic structural diagram of a pixel circuit provided by an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0021] Figure 5 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0023] Figure 7 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0024] Figure 8 A schematic diagram of the structure of a current control module provided by an embodiment of the present invention;

[0025] Fig. 9 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0026] Fig.10 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0027] Fig.11 A schematic diagram of waveforms of node voltage and driving current provided by an embodiment of the present invention;

[0028] Fig.12A flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention;

[0029] Fig.13 A flowchart of another method for driving a pixel circuit provided by an embodiment of the present invention;

[0030] Fig.14 A flowchart of another method for driving a pixel circuit provided by an embodiment of the present invention;

[0031] Fig.15 A schematic structural diagram of a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] As described in the background technology, the existing PWM driving method has the problem of poor display effect. The inventors have found that the reason for the above problem is that for the existing pixel circuit using the PWM driving method, the pixel circuit at least includes a PWM driving module and a light-emitting element, wherein the PWM driving module is used to convert the analog grayscale voltage into a time signal through PWM modulation. In the process of the PWM driving module controlling the light-emitting time of the light-emitting element, due to the limited slope of the sweep signal SWEEP and the existence of the subthreshold swing of the controlled transistor, the controlled transistor presents a slow shutdown process, so that the light emission ends slowly, and the phenomenon of low grayscale display color deviation is prone to occur, which reduces the display effect.

[0035] In view of the above problems, an embodiment of the present invention provides a pixel circuit. Figure 1 A schematic diagram of a pixel circuit according to an embodiment of the present invention is provided. Figure 1 , the pixel circuit provided in this embodiment includes:

[0036] The time control module 10 includes a control terminal G1, a data writing terminal N1 and an output terminal PW. The time control module 10 is used to write the first data signal Vdata_t connected to the data writing terminal N1 to the control terminal G1 in the first data writing phase, and control the potential of its own output terminal PW according to the first data signal Vdata_t and the sweep signal SWEEP in the light-emitting phase to control the light-emitting time of the light-emitting element. The light-emitting element can be connected to the output terminal PW of the time control module 10, or can be connected to the output terminal PW of the time control module 10 through a PAM module.

[0037] The potential control module 20 includes a first control terminal, a second control terminal, a first input terminal, a second input terminal and an output terminal. The first control terminal of the potential control module 20 is connected to the output terminal PW of the time control module 10, and the second control terminal is connected to the first light-emitting control signal line to respond to the first light-emitting control signal EM1 output by the first light-emitting control signal line. The first input terminal is connected to the first power line to access the first power supply voltage VDDW transmitted on the first power line, and the second input terminal is connected to the second power line to access the second power supply voltage VSS transmitted on the second power line. The potential control module 20 is used to respond to the potential of the output terminal PW of the time control module 10 and the first light-emitting control signal EM1 on the first light-emitting control signal line, and output the first power supply voltage VDDW on the first power line or the second power supply voltage VSS on the second power line.

[0038] Specifically, the first power supply voltage VDDW on the first power supply line and the second power supply voltage VSS on the second power supply line are two different voltages, and there is a voltage difference between the first power supply voltage VDDW and the second power supply voltage VSS. The pixel circuit also includes a first coupling unit 30, the first coupling unit 30 includes a first end and a second end, the first end is connected to the output end of the potential control module 20, and the second end is connected to the control end G1 of the time control module 10, and the first coupling unit 30 is used to control the potential of the control end G1 of the time control module 10 according to the potential of the output end of the potential control module 20, so as to control the potential of the output end PW of the time control module 10.

[0039] Exemplarily, before the light-emitting stage, the potential control module 20 is used to respond to the potential of the output terminal PW of the time control module 10 and the first light-emitting control signal EM1 on the first light-emitting control signal line, and transmit the first power supply voltage VDDW on the first power supply line to the first end of the first coupling unit 30. When the light-emitting is finished, the potential control module 20 is used to respond to the potential of the output terminal PW of the time control module 10 and the first light-emitting control signal EM1 on the first light-emitting control signal line, and transmit the second power supply voltage VSS on the second power supply line to the first end of the first coupling unit 30. Therefore, the voltage at the first end of the first coupling unit 30 jumps from the first power supply voltage VDDW to the second power supply voltage VSS. Under the coupling action of the first coupling unit 30, the voltage at the control end of the time control module 10 changes synchronously with the voltage at the first end of the first coupling unit 30, so that the voltage at the control end G1 of the time control module 10 changes rapidly, thereby quickly switching the on and off states of the time control module 10, so that the voltage at the output end PW of the time control module 10 has a faster switching speed, so as to ensure that the output end PW of the time control module 10 can be quickly pulled to the off voltage at the end of the light emission, thereby controlling the light-emitting element to be quickly extinguished, and accurately controlling the light-emitting time.

[0040] The technical solution provided by the embodiment of the present invention is to associate the output end and the control end of the time control module by setting a potential control module and a first coupling unit between the output end and the control end of the time control module. When the light emission ends, the potential control module is controlled to respond to the potential of the output end of the time control module and the first light emission control signal on the first light emission control signal line to change the voltage of the first end of the first coupling unit (that is, the voltage of the output end of the potential control module), and synchronously change the voltage of the control end of the time control module through the first coupling unit, so that the time control module can quickly switch its on-off state, so that the voltage switching speed of the output end of the time control module is faster, so as to control the light emitting element to be extinguished quickly and reduce the duration of the end of the light emission, which is beneficial to improve the display color deviation or uneven display phenomenon caused by the shutdown delay when the pixel circuit is turned off, and is beneficial to improve the display effect.

[0041] Figure 2 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 2On the basis of the above technical solution, optionally, the potential control module 20 includes a first subunit 201 and a second subunit 202, the control end of the first subunit 201 is connected to the output end PW of the time control module 10, the first end of the first subunit 201 is connected to the first power line, the second end of the first subunit 201 and the second end of the second subunit 202 are connected to the first node A, the first end of the second subunit 202 is connected to the second power line, the control end of the second subunit 202 is connected to the first light-emitting control signal line, and the first end of the first coupling unit 30 is connected to the first node A.

[0042] Specifically, the control end of the first subunit 201 is the first control end of the potential control module 20, the first end of the first subunit 201 is the first input end of the potential control module 20, and the second end of the first subunit 201 and the second end of the second subunit 202 are connected together as the output end of the potential control module 20. The control end of the second subunit 202 is the second control end of the potential control module 20, and the first end of the second subunit 202 is the second input end of the potential control module 20. The first subunit 201 is used to transmit the first power supply voltage VDDW to the first node A in response to the voltage of the output end PW of the time control module 10, and the second subunit 202 is used to transmit the second power supply voltage VSS to the first node A in response to the first light emitting control signal.

[0043] Optionally, in this embodiment, the first power voltage VDDW transmitted on the first power line may be greater than the second power voltage VSS transmitted on the second power line.

[0044] Figure 3 A schematic diagram of another pixel circuit structure provided by an embodiment of the present invention, specifically: Figure 2 The potential control module 20 is shown as a schematic diagram of a device structure. Figure 3 The first subunit 201 includes a first transistor M1, the gate of the first transistor M1 is the control terminal of the first subunit 201, the first pole of the first transistor M1 is the first terminal of the first subunit 201, and the second pole of the first transistor M1 is the second terminal of the first subunit 201; the second subunit 202 includes a second transistor M2, the gate of the second transistor M2 is the control terminal of the second subunit 202, the first pole of the second transistor M2 is the first terminal of the second subunit 202, and the second pole of the second transistor M2 is the second terminal of the second subunit 202.

[0045] The first coupling unit 30 includes a first capacitor C1 , a first pole of the first capacitor C1 is a first end of the first coupling unit 30 , and a second pole of the first capacitor C1 is a second end of the first coupling unit 30 .

[0046] Among them, the width-to-length ratio of the first transistor M1 is greater than the width-to-length ratio of the second transistor M2, and the first transistor M1 and the second transistor M2 together constitute an inverting amplifier. Taking the case where the time control module 10 is turned on in response to the low level of its own control terminal G1 as an example, in the light-emitting stage, the time control module 10 is in the off state, and the output terminal PW of the time control module 10 is at a low level, then the first transistor M1 is turned on, although the second transistor M2 is also turned on in response to the first light-emitting control signal EM1, but because the width-to-length ratio of the first transistor M1 is greater than the width-to-length ratio of the second transistor M2, the driving capability of the first transistor M1 is stronger than the driving capability of the second transistor M2, and the potential of the first node A is dominated by the first transistor M1, and the voltage of the first node A is the first power supply voltage VDDW. When the light emission ends, the control terminal G1 of the time control module 10 is gradually pulled down under the action of the sweep signal SWEEP, the time control module 10 is slowly turned on, and the PW node is gradually pulled up to the off voltage. In this process, when the voltage of the PW node causes the first transistor M1 to turn off, the second transistor M2 dominates the potential of the first node A, and the voltage of the first node A is pulled down from the first power supply voltage VDDW to the second power supply voltage VSS. Through the coupling of the first capacitor C1, the voltage of the control terminal G1 of the time control module 10 is synchronously pulled down to quickly turn on the time control module 10, so that the voltage of the output terminal PW of the time control module 10 is quickly switched to the off voltage, thereby controlling the light-emitting element to be quickly extinguished and reducing the duration of the end of light emission.

[0047] In this embodiment, the first transistor M1 and the second transistor M2 can be transistors of the same channel type. For example, the first transistor M1 and the second transistor M2 can both be P-type transistors, and do not need to be set as N-type transistors, which is conducive to simplifying the process, reducing the process complexity, and will not increase the layout area.

[0048] In the digital-analog hybrid driving mode, if the time control module 10 is turned on slowly, it will cause the falling edge of the driving current waveform to be larger, which will also cause the problem of poor low grayscale display.

[0049] Figure 4 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 4 On the basis of the above technical solutions, optionally, the pixel circuit provided in this embodiment also includes a current control module 40, the current control module 40 is connected between the third power line and the first end of the light-emitting element 50, the second end of the light-emitting element 50 is connected to the second power line, the control end of the current control module 40 is connected to the output end PW of the time control module 10, and the current control module 40 is used to drive the light-emitting element 50 to emit light according to the second data signal Vdata_I.

[0050] Among them, the third power line is used to transmit the third power supply voltage VDDA. In the light-emitting stage, the current control module 40 generates a driving current according to the second data signal Vdata_I to drive the light-emitting element 50 to emit light. When the light emission ends, the time control module 10 is controlled by the sweep signal SWEEP, and the potential of the control terminal G1 thereof gradually decreases, the time control module 10 is gradually turned on, and the voltage of the output terminal PW of the time control module 10 gradually increases (the first power supply voltage VDDW is gradually transmitted to the output terminal PW via the time control module 10). When the PW node voltage turns off the first transistor M1, the voltage of the first node A jumps from the first power supply voltage VDDW to the second power supply voltage VSS. Through the coupling effect of the first capacitor C1, the potential of the control terminal G1 of the time control module 10 is quickly pulled down, so that the time control module 10 is quickly turned on, so that the voltage of the PW node can be quickly switched to the first power supply voltage VDDW. Under the action of the PW node voltage, the current control module 40 is quickly turned off, reducing the falling edge of the driving current, thereby reducing the attenuation of the driving current, which is conducive to improving the uniformity of the display brightness.

[0051] Figure 5 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 5 On the basis of the above technical solution, optionally, the time control module 10 includes a first driving unit 101 and a second coupling unit 102. The control end of the first driving unit 101 is the control end G1 of the time control module 10. The first driving unit 101 is connected between the first power line and the output end PW of the time control module 10. The first end of the second coupling unit 102 is the data writing end N1 of the time control module 10 connected to the first data line, and the second end of the second coupling unit 102 is connected to the control end of the first driving unit 101. The second coupling unit 102 is used to couple the first data signal Vdata_t to the control end of the first driving unit 101 before the light-emitting stage, and control the voltage of the control end of the first driving unit 101 according to the sweep signal SWEEP at the end of the light-emitting. Among them, the first data line is used to transmit the first data signal Vdata_t and the sweep signal SWEEP in time-sharing. Here, the second end of the first driving unit 101 can be used as the output end PW of the time control module 10.

[0052] Of course, in other embodiments, the first data signal Vdata_t and the sweep signal SWEEP may also be transmitted by two different signal lines.

[0053] The current control module 40 includes a second driving unit 401 and a third light-emitting control unit 402, wherein the control end of the third light-emitting control unit 402 is the control end of the current control module 40, and the third light-emitting control unit 402 and the second driving unit 401 are connected in series between the third power line and the first end of the light-emitting element 50. The second driving unit 401 is used to generate a driving current according to the second data signal Vdata_I when the third light-emitting control unit 402 is turned on, so as to drive the light-emitting element 50 to emit light.

[0054] Figure 6 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 6 On the basis of the above technical solution, optionally, the time control module 10 further includes a first compensation unit 103, the control end of the first compensation unit 103 is connected to the first scan line, in response to the first scan signal S1 transmitted on the first scan line, the first end of the first compensation unit 103 is connected to the second end of the first driving unit 101, and the second end of the first compensation unit 103 is connected to the control end of the first driving unit 101. In the threshold compensation stage, the first power supply voltage VDDW on the first power line is written to the control end of the first driving unit 101 via the first driving unit 101 and the first compensation unit 103 to achieve threshold compensation for the first driving unit 101, thereby improving the accuracy of the time signal output by the time control module 10.

[0055] Continue to refer Figure 6 Optionally, the time control module 10 also includes a reset unit 104, a control end of the reset unit 104 is connected to the reset signal line to respond to the reset signal Set transmitted on the reset signal line, a first end of the reset unit 104 is connected to the first initialization signal line, and a second end of the reset unit 104 is connected to the output end PW of the time control module 10, and the reset unit 104 is used to respond to the reset signal Set and turn on before the light-emitting stage, transmit the first initialization voltage Vref1 on the first initialization signal line to the output end PW of the time control module 10, initialize the output end PW of the time control module 10, and turn on the third light-emitting control unit 402 to prepare for the light-emitting stage.

[0056] Figure 7 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 7On the basis of the above technical solution, optionally, the time control module 10 further includes a first initialization unit 107, a first light-emitting control unit 105 and a second light-emitting control unit 106, the control end of the first initialization unit 107 is connected to the second scan line, the first end of the first initialization unit 107 is connected to the second initialization signal line, and the second end of the first initialization unit 107 is connected to the control end of the first driving unit 101; the control end of the first light-emitting control unit 105 is connected to the first scan line, the first end of the first light-emitting control unit 105 is connected to the first power line, the second end of the first light-emitting control unit 105 is connected to the first end of the first driving unit 101, the control end of the second light-emitting control unit 106 is connected to the first light-emitting control signal line, the first end of the second light-emitting control unit 106 is connected to the first power line, and the second end of the second light-emitting control unit 106 is connected to the first end of the first driving unit 101. Among them, the purpose of setting the first light-emitting control unit 105 and the second light-emitting control unit 106 is to cut off the connection between the first end of the first driving unit 101 and the first power line after the threshold compensation stage, so as to prevent the on-state capacitance between the control end and the first end of the first driving unit 101 from causing adverse effects on the potential of the control end of the first driving unit 101.

[0057] Figure 8 A schematic diagram of a current control module according to an embodiment of the present invention is provided. Figure 8 On the basis of the above technical solutions, optionally, the current control module 40 also includes a second compensation unit 404 and a data writing unit 403, the control end of the second compensation unit 404 and the control end of the data writing unit 403 are both connected to the second scanning line, the second compensation unit 404 is connected between the second end and the control end of the second driving unit 401, the data writing unit 403 is connected between the second data line and the first end of the second driving unit 401, and the data writing unit 403 is used to write the second data signal Vdata_I to the control end of the second driving unit 401 in the second data writing stage.

[0058] The current control module 40 also includes a fourth light-emitting control unit 405 and a second initialization unit 406. The control end of the fourth light-emitting control unit 405 is connected to the second light-emitting control signal line. The fourth light-emitting control unit 405 is connected between the second end of the second driving unit 401 and the first end of the light-emitting element 50. The control end of the second initialization unit 406 is connected to the third scanning line. The second initialization unit 406 is connected between the third initialization signal line and the control end of the second driving unit 401. The second initialization unit 406 is used to transmit the third initialization voltage Vref3 on the third initialization signal line to the control end of the second driving unit 401 to initialize the control end of the second driving unit 401.

[0059] Optionally, the current control module 40 further includes a first storage unit 407 and a second storage unit 408, wherein the first storage unit 407 is connected between the control end of the third light-emitting control unit 402 and the third power line, and the second storage unit 408 is connected between the control end of the second driving unit 401 and the third power line.

[0060] Fig. 9 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig. 9 On the basis of the above technical solutions, optionally, the first driving unit 101 includes a third transistor M3, the first compensation unit 103 includes a fourth transistor M4, the reset unit 104 includes a fifth transistor M5, the first light-emitting control unit 105 includes a sixth transistor M6, the second light-emitting control unit 106 includes a seventh transistor M7, the first initialization unit 107 includes an eighth transistor M8, and the second coupling unit 102 includes a second capacitor C2. The first electrode of the second capacitor C2 is connected to the first data signal Vdata_t and the frequency sweep signal in a time-sharing manner, the second electrode of the second capacitor C2 is connected to the gate of the third transistor M3, the first electrode of the third transistor M3 is connected to the first power line through the sixth transistor M6 and the seventh transistor M7, the gate of the sixth transistor M6 is connected to the first scan line, and the gate of the seventh transistor M7 is connected to the first light-emitting control signal line.

[0061] The gate of the fourth transistor M4 is connected to the first scan line, the first electrode of the fourth transistor M4 is connected to the second electrode of the third transistor M3, and the second electrode of the fourth transistor M4 is connected to the gate of the third transistor M3. The gate of the fifth transistor M5 is connected to the reset signal line, the first electrode of the fifth transistor M5 is connected to the first initialization signal line, and the second electrode of the fifth transistor M5 is connected to the second electrode of the third transistor M3. The gate of the eighth transistor M8 is connected to the second scan line, the first electrode of the eighth transistor M8 is connected to the second initialization signal line, and the second electrode of the eighth transistor M8 is connected to the gate of the third transistor M3.

[0062] Continue to refer Fig. 9 The second driving unit 401 includes a ninth transistor M9, the third light emitting control unit 402 includes a tenth transistor M10, the data writing unit 403 includes an eleventh transistor M11, the second compensation unit 404 includes a twelfth transistor M12, the fourth light emitting control unit 405 includes a thirteenth transistor M13, the second initialization unit 406 includes a fourteenth transistor M14, the first storage unit 407 includes a third capacitor C3, and the second storage unit 408 includes a fourth capacitor C4. The light emitting element 50 includes a light emitting diode D1.

[0063] The tenth transistor M10, the ninth transistor M9 and the thirteenth transistor M13 are connected in series between the third power line and the first electrode of the light emitting diode D1, the second electrode of the light emitting diode D1 is connected to the second power line, and the gate of the thirteenth transistor M13 is connected to the second light emitting control signal line. The gate of the eleventh transistor M11 and the gate of the twelfth transistor M12 are both connected to the second scan line, the first electrode of the eleventh transistor M11 is connected to the second data line, the second electrode of the eleventh transistor M11 is connected to the first electrode of the ninth transistor M9, the first electrode of the twelfth transistor M12 is connected to the second electrode of the ninth transistor M9, and the second electrode of the twelfth transistor M12 is connected to the gate of the ninth transistor M9. The first electrode of the fourteenth transistor M14 is connected to the third initialization signal line, the second electrode of the fourteenth transistor M14 is connected to the gate of the ninth transistor M9, and the gate of the fourteenth transistor M14 is connected to the third scan line.

[0064] Fig.10 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention can be used for Fig. 9 The pixel circuit shown in Fig. 9 As an example, each transistor in the pixel circuit shown is a P-type transistor. Fig.10 The specific working process of the pixel circuit includes a voltage writing stage T1, a voltage normalization stage T2, a reset stage T3 and a light emitting stage T4, wherein the voltage writing stage T1 includes a t1 stage, a t2 stage and a t3 stage.

[0065] In the t1 phase (corresponding to the initialization phase), the first scan signal line is configured to transmit a high-level first scan signal S1, the second scan signal line is configured to transmit a high-level second scan signal S2, the third scan signal line is configured to transmit a low-level third scan signal S3, the reset signal line is configured to transmit a high-level reset signal Set, the first light-emitting control signal line is configured to transmit a high-level first light-emitting control signal EM1, and the second light-emitting control signal line is configured to transmit a high-level second light-emitting control signal EM2. Therefore, the fourteenth transistor M14 is turned on, and the third initialization voltage Vref3 transmitted on the third initialization signal line is written to the gate of the ninth transistor M9 through the fourteenth transistor M14, so as to initialize the gate potential of the ninth transistor M9 and turn on the ninth transistor M9.

[0066] In the t2 phase (corresponding to the second data writing phase), the first scan signal line is configured to transmit a high-level first scan signal S1, the second scan signal line is configured to transmit a low-level second scan signal S2, the third scan signal line is configured to transmit a high-level third scan signal S3, the reset signal line is configured to transmit a high-level reset signal Set, the first light-emitting control signal line is configured to transmit a high-level first light-emitting control signal EM1, and the second light-emitting control signal line is configured to transmit a high-level second light-emitting control signal EM2. Therefore, the eleventh transistor M11, the twelfth transistor M12 and the eighth transistor M8 are turned on. The second data signal Vdata_I is transmitted to the gate of the ninth transistor M9 through the eleventh transistor M11, the ninth transistor M9 and the twelfth transistor M12 until the gate voltage of the ninth transistor M9 is Vdata_I+Vth9, and the ninth transistor M9 is turned off to achieve data writing and threshold compensation. Wherein, Vth9 is the threshold voltage of the ninth transistor M9.

[0067] At the same time, the second initialization voltage Vref2 on the second initialization signal line is transmitted to the gate of the third transistor M3 via the eighth transistor M8 to initialize the gate of the third transistor M3.

[0068] In the t3 phase (corresponding to the threshold compensation phase), the first scan signal line is configured to transmit a low-level first scan signal S1, the second scan signal line is configured to transmit a high-level second scan signal S2, the third scan signal line is configured to transmit a high-level third scan signal S3, the reset signal line is configured to transmit a high-level reset signal Set, the first light-emitting control signal line is configured to transmit a high-level first light-emitting control signal EM1, and the second light-emitting control signal line is configured to transmit a high-level second light-emitting control signal EM2. Therefore, the fourth transistor M4 and the sixth transistor M6 are turned on, and the first power supply voltage VDDW is written to the gate of the third transistor M3 (the control terminal G1 of the time control module 10) through the sixth transistor M6, the third transistor M3 and the fourth transistor M4, until the gate voltage of the third transistor M3 is VDDW+Vth3, the third transistor M3 is turned off, and the gate voltage of the third transistor M3 is stabilized at VDDW+Vth3, wherein Vth3 is the threshold voltage of the third transistor M3, and the threshold compensation of the third transistor M3 is achieved. At the same time, the first data signal Vdata_t transmitted on the first data line is written into the first end of the second capacitor C2. At this time, the voltage difference between the two ends of the second capacitor C2 is VDDW+Vth3-Vdata_t.

[0069] Phase t4 is the time period during which the voltage writing phase T1 is performed row by row for the remaining rows of sub-pixels, so as to complete the data writing of all the pixel rows.

[0070] In the voltage normalization phase T2 (corresponding to the first data writing phase), the first scan signal line is configured to transmit a high-level first scan signal S1, the second scan signal line is configured to transmit a high-level second scan signal S2, the third scan signal line is configured to transmit a high-level third scan signal S3, the reset signal line is configured to transmit a high-level reset signal Set, the first light-emitting control signal line is configured to transmit a high-level first light-emitting control signal EM1, and the second light-emitting control signal line is configured to transmit a high-level second light-emitting control signal EM2. The first data signal Vdata_t transmitted on the first data line jumps to the high level SWEEP-H of the sweep signal SWEEP. In this embodiment, the high level SWEEP-H of the sweep signal SWEEP is greater than or equal to the maximum value of the first data signal Vdata_t, for example, SWEEP-H=Vdata'. The voltage at the first end of the second capacitor C2 is pulled up from Vdata_t to Vdata', and the voltage at the second end of the second capacitor C2 is Vdata'+VDDW+Vth3-Vdata_t, and the first data signal Vdata_t is written to the gate of the third transistor M3. Here, since the seventh transistor M7 and the sixth transistor M6 are both turned off, there is no on-state capacitance between the gate and the first electrode of the third transistor M3, which will not affect the charge and discharge rate of the third transistor M3, and can ensure the accuracy of the gate voltage of the third transistor M3.

[0071] In the reset phase T3, the first scan signal line is configured to transmit a high-level first scan signal S1, the second scan signal line is configured to transmit a high-level second scan signal S2, the third scan signal line is configured to transmit a high-level third scan signal S3, the reset signal line is configured to transmit a low-level reset signal Set, the first light-emitting control signal line is configured to transmit a high-level first light-emitting control signal EM1, and the second light-emitting control signal line is configured to transmit a high-level second light-emitting control signal EM2. Therefore, the fifth transistor M5 is turned on, and the first initialization voltage Vref1 on the first initialization signal line is transmitted to the gate of the tenth transistor M10, the gate of the tenth transistor M10 is reset, and the tenth transistor M10 is turned on. At the same time, the first transistor M1 is turned on in response to the voltage of the PW node, and the first power supply voltage VDDW is transmitted to the first node A.

[0072] In the light-emitting stage T4, the first scan signal line is configured to transmit a high-level first scan signal S1, the second scan signal line is configured to transmit a high-level second scan signal S2, the third scan signal line is configured to transmit a high-level third scan signal S3, the reset signal line is configured to transmit a high-level reset signal Set, the first light-emitting control signal line is configured to transmit a low-level first light-emitting control signal EM1, and the second light-emitting control signal line is configured to transmit a low-level second light-emitting control signal EM2. Therefore, the second transistor M2, the seventh transistor M7, and the thirteenth transistor M13 are turned on. The ninth transistor M9 generates a driving current according to the second data signal Vdata_I to drive the light-emitting diode D1 to emit light.

[0073] During the light-emitting process, the second transistor M2 is in the on state, but since the width-to-length ratio of the first transistor M1 is greater than the width-to-length ratio of the second transistor M2, the potential of the first node A is still dominated by the first transistor M1, and the potential of the first node A is still the first power supply voltage VDDW, or a voltage close to the first power supply voltage VDDW.

[0074] At the same time, the sweep signal SWEEP gradually changes from a high level SWEEP-H to a low level SWEEP-L, and due to the coupling effect of the second capacitor C2, the gate potential of the third transistor M3 changes synchronously. When the light emission ends, the sweep signal SWEEP gradually turns on the third transistor M3, and the PW node is gradually pulled up to the off voltage. Fig.11 A schematic diagram of a waveform of a node voltage and a driving current provided by an embodiment of the present invention, referring to Fig.11 In this process, when the voltage of the PW node turns off the first transistor M1, the second transistor M2 dominates the potential of the first node A, and the voltage of the first node A is pulled down from the first power supply voltage VDDW to the second power supply voltage VSS. Through the coupling of the first capacitor C1, the voltage of the gate of the third transistor M3 is synchronously pulled down, forming a cycle process of G1 node voltage reduction - PW node voltage reduction - first node A voltage reduction - G1 node voltage reduction, so as to quickly turn on the third transistor M3, so that the voltage of the output terminal PW of the time control module 10 is quickly switched to the shutdown voltage (such as the first power supply voltage VDDW), thereby controlling the light-emitting diode D1 to quickly extinguish, reducing the duration of the light emission end, and preventing the driving current falling edge from being too large (current attenuation) due to the delayed shutdown of the pixel circuit, thereby affecting the display effect.

[0075] Optionally, an embodiment of the present invention further provides a method for driving a pixel circuit, and the method for driving a pixel circuit can be applicable to a pixel circuit provided by any embodiment of the present invention. Fig.12 A flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention, referring to Fig.12, the driving method of the pixel circuit includes:

[0076] S110 , in the first data writing phase, controlling the time control module to connect the data writing end to the first data signal and write it into the control end.

[0077] S120. In the light-emitting stage, the time control module is controlled to control the potential of its own output terminal according to the first data signal and the sweep signal to control the light-emitting time of the light-emitting element, and at the end of the light-emitting time, the potential control module is controlled to respond to the potential of the output terminal of the time control module and the first light-emitting control signal on the first light-emitting control signal line, and output the first power supply voltage on the first power line or the second power supply voltage on the second power line to the first end of the first coupling unit, and the potential of the control terminal of the time control module is controlled by the first coupling unit, thereby controlling the potential of the output terminal of the time control module.

[0078] The technical solution provided by the embodiment of the present invention is to associate the output end and the control end of the time control module by setting a potential control module and a first coupling unit between the output end and the control end of the time control module. When the light emission ends, the potential control module is controlled to respond to the potential of the output end of the time control module and the first light emission control signal on the first light emission control signal line to change the voltage of the first end of the first coupling unit (that is, the voltage of the output end of the potential control module), and synchronously change the voltage of the control end of the time control module through the first coupling unit, so that the time control module can quickly switch its on-off state, so that the voltage switching speed of the output end of the time control module is faster, so as to control the light emitting element to be extinguished quickly and reduce the duration of the end of the light emission, which is beneficial to improve the display color deviation or uneven display phenomenon caused by the shutdown delay when the pixel circuit is turned off, and is beneficial to improve the display effect.

[0079] Fig.13 A flowchart of another pixel circuit driving method provided by an embodiment of the present invention, referring to Figure 2 and Fig.13 , step S120 specifically includes:

[0080] S1201. In the light-emitting stage, the second subunit is controlled to be turned on in response to the first light-emitting control signal on the first light-emitting control signal line, the first subunit is controlled to be turned on in response to the potential of the output end of the time control module, and the first power supply voltage on the first power supply line is transmitted to the first node.

[0081] S1202, at the end of light emission, control the first subunit to respond to the potential of the output end of the time control module to turn off, and control the second subunit to transmit the second power supply voltage on the second power line to the first node, and control the first coupling unit to adjust the potential of the control end of the time control module to control the potential of the output end of the time control module.

[0082] in, Fig.13 The specific process of the driving method of the pixel circuit shown in FIG. Figure 2 The relevant description of the pixel circuit shown is not repeated here, and it also has the beneficial effects described in the above embodiments.

[0083] Fig.14 A flowchart of another pixel circuit driving method provided by an embodiment of the present invention, referring to Fig.14 , the driving method of the pixel circuit provided in this embodiment includes:

[0084] S310 , in the second initialization stage, controlling the second initialization unit to be turned on in response to the third scan signal on the third scan line, and transmitting the third initialization voltage on the third initialization signal line to the control end of the second driving unit.

[0085] S210, in the first initialization stage, controlling the first initialization unit to respond to the second scanning signal on the second scanning line to conduct, and transmitting the second initialization voltage on the second initialization signal line to the control end of the first driving unit; and in the second data writing stage, controlling the data writing unit and the second compensation unit to respond to the second scanning signal to conduct, respectively, and transmitting the second data signal to the control end of the second driving unit via the second compensation unit.

[0086] S220, in the compensation stage, controlling the first compensation unit and the first light-emitting control unit to be turned on in response to the first scan signal on the first scan line, so as to transmit the first power supply voltage on the first power line from the first compensation unit to the control end of the first driving unit.

[0087] S1101 , in a first data writing phase, controlling the voltage on the first data line to jump from a first data signal to a frequency sweeping signal, and writing the first data signal to a control end of a first driving unit through a second coupling unit.

[0088] S230 , in the reset phase, controlling the reset unit to be turned on in response to the reset signal on the reset signal line, and transmitting the first initialization voltage on the first initialization signal line to the output end of the time control module.

[0089] S120. In the light-emitting stage, the time control module is controlled to control the potential of its own output terminal according to the first data signal and the sweep signal to control the light-emitting time of the light-emitting element, and at the end of the light-emitting time, the potential control module is controlled to respond to the potential of the output terminal of the time control module and the first light-emitting control signal on the first light-emitting control signal line, and output the first power supply voltage on the first power line or the second power supply voltage on the second power line to the first end of the first coupling unit, and the potential of the control terminal of the time control module is controlled by the first coupling unit, thereby controlling the potential of the output terminal of the time control module.

[0090] in, Fig.14 The specific process of the driving method of the pixel circuit shown in FIG. Fig. 9 The relevant description of the pixel circuit shown is not repeated here, and it also has the beneficial effects described in the above embodiments.

[0091] Optionally, an embodiment of the present invention further provides a display panel, the display panel comprising the pixel circuit provided by any embodiment of the present invention, Fig.15 A schematic diagram of a display panel according to an embodiment of the present invention is provided. The display panel 200 can not only Fig.15 The mobile phone panel shown can also be a display panel of electronic devices such as a tablet, a mobile phone, a watch, a wearable device, and a car display, a camera display, a television, and a computer screen. Since the display panel includes the pixel circuit provided by any embodiment of the present invention, the display panel provided by the embodiment of the present invention also has the beneficial effects described in any embodiment of the present invention.

[0092] 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.

[0093] 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: A time control module, comprising a control end, a data writing end and an output end, wherein the time control module is used to write a first data signal connected to the data writing end to the control end in a first data writing phase, and to control the potential of its own output end according to the first data signal and the sweep signal in a light emitting phase, so as to control the light emitting time of the light emitting element; A potential control module, comprising a first control end, a second control end, a first input end, a second input end and an output end, wherein the first control end of the potential control module is connected to the output end of the time control module, the second control end is connected to the first light-emitting control signal line, the first input end is connected to the first power line, and the second input end is connected to the second power line, and the potential control module is used to respond to the potential of the output end of the time control module and the first light-emitting control signal on the first light-emitting control signal line, and output a first power supply voltage on the first power line or a second power supply voltage on the second power line; The first coupling unit includes a first end and a second end, wherein the first end is connected to the output end of the potential control module, and the second end is connected to the control end of the time control module, and the first coupling unit is used to control the potential of the control end of the time control module according to the potential of the output end of the potential control module to control the potential of the output end of the time control module.

2. The pixel circuit according to claim 1, characterized in that: The potential control module includes a first subunit and a second subunit; The control end of the first subunit is connected to the output end of the time control module, the first end of the first subunit is connected to the first power line, the second end of the first subunit and the second end of the second subunit are connected to a first node, the first end of the second subunit is connected to the second power line, the control end of the second subunit is connected to the first light-emitting control signal line, and the first end of the first coupling unit is connected to the first node.

3. The pixel circuit according to claim 2, characterized in that: The first subunit includes a first transistor, the gate of the first transistor is the control terminal of the first subunit, the first pole of the first transistor is the first terminal of the first subunit, and the second pole of the first transistor is the second terminal of the first subunit; The second subunit includes a second transistor, the gate of the second transistor is the control terminal of the second subunit, the first pole of the second transistor is the first terminal of the second subunit, and the second pole of the second transistor is the second terminal of the second subunit; Preferably, a channel type of the first transistor is the same as a channel type of the second transistor, and a width-to-length ratio of the first transistor is greater than a width-to-length ratio of the second transistor; Preferably, the first power supply voltage transmitted on the first power supply line is greater than the second power supply voltage transmitted on the second power supply line; Preferably, the first coupling unit comprises a first capacitor, a first pole of the first capacitor is a first end of the first coupling unit, and a second pole of the first capacitor is a second end of the first coupling unit.

4. The pixel circuit according to claim 1, characterized in that: The time control module comprises a first driving unit and a second coupling unit, wherein the control end of the first driving unit is the control end of the time control module, the first driving unit is connected between the first power line and the output end of the time control module, the first end of the second coupling unit is the data writing end of the time control module connected to the first data line, and the second end of the second coupling unit is connected to the control end of the first driving unit; Preferably, the time control module further comprises a first compensation unit, a control end of the first compensation unit is connected to the first scanning line, a first end of the first compensation unit is connected to the second end of the first driving unit, and the second end of the first compensation unit is connected to the control end of the first driving unit; Preferably, the time control module further comprises a reset unit, a control end of the reset unit is connected to a reset signal line, a first end of the reset unit is connected to a first initialization signal line, and a second end of the reset unit is connected to an output end of the time control module; Preferably, the time control module also includes a first initialization unit, a first light-emitting control unit and a second light-emitting control unit, the control end of the first initialization unit is connected to the second scan line, the first end of the first initialization unit is connected to the second initialization signal line, and the second end of the first initialization unit is connected to the control end of the first driving unit; the control end of the first light-emitting control unit is connected to the first scan line, the first end of the first light-emitting control unit is connected to the first power line, the second end of the first light-emitting control unit is connected to the first end of the first driving unit, the control end of the second light-emitting control unit is connected to the first light-emitting control signal line, the first end of the second light-emitting control unit is connected to the first power line, and the second end of the second light-emitting control unit is connected to the first end of the first driving unit.

5. The pixel circuit according to claim 1, characterized in that: It also includes a current control module, the current control module is connected between the third power line and the first end of the light emitting element, the second end of the light emitting element is connected to the second power line, the control end of the current control module is connected to the output end of the time control module, and the current control module is used to drive the light emitting element to emit light according to the second data signal; Preferably, the current control module comprises a second driving unit and a third light-emitting control unit, the control end of the third light-emitting control unit is the control end of the current control module, and the third light-emitting control unit and the second driving unit are connected in series between the third power line and the first end of the light-emitting element; Preferably, the current control module further includes a second compensation unit and a data writing unit, wherein the control end of the second compensation unit and the control end of the data writing unit are both connected to the second scanning line, the second compensation unit is connected between the second end and the control end of the second driving unit, the data writing unit is connected between the second data line and the first end of the second driving unit, and the data writing unit is used to write the second data signal to the control end of the second driving unit in the second data writing phase; Preferably, the current control module further includes a fourth light-emitting control unit and a second initialization unit, the control end of the fourth light-emitting control unit is connected to the second light-emitting control signal line, the fourth light-emitting control unit is connected between the second end of the second driving unit and the first end of the light-emitting element, the control end of the second initialization unit is connected to the third scanning line, and the second initialization unit is connected between the third initialization signal line and the control end of the second driving unit; Preferably, the current control module also includes a first storage unit and a second storage unit, the first storage unit is connected between the control end of the third light-emitting control unit and the third power line, and the second storage unit is connected between the control end of the second driving unit and the third power line.

6. A method for driving a pixel circuit, characterized in that: The pixel circuit includes a time control module, a potential control module and a first coupling unit, the time control module includes a control end, a data writing end and an output end, the potential control module includes a first control end, a second control end, a first input end, a second input end and an output end, the first control end of the potential control module is connected to the output end of the time control module, the second control end is connected to the first light-emitting control signal line, the first input end is connected to the first power line, the second input end is connected to the second power line, the first end of the first coupling unit is connected to the output end of the potential control module, and the second end of the first coupling unit is connected to the control end of the time control module; The driving method of the pixel circuit includes: In the first data writing phase, controlling the time control module to connect the data writing end to the first data signal and write it into the control end; In the light-emitting stage, the time control module is controlled to control the potential of its own output end according to the first data signal and the sweep signal to control the light-emitting time of the light-emitting element, and at the end of the light-emitting time, the potential control module is controlled to respond to the potential of the output end of the time control module and the first light-emitting control signal on the first light-emitting control signal line, output the first power supply voltage on the first power line or the second power supply voltage on the second power line to the first end of the first coupling unit, and control the potential of the control end of the time control module through the first coupling unit, thereby controlling the potential of the output end of the time control module.

7. The driving method of the pixel circuit according to claim 6, characterized in that: The potential control module comprises a first subunit and a second subunit, the control end of the first subunit is connected to the output end of the time control module, the first end of the first subunit is connected to the first power line, the second end of the first subunit and the second end of the second subunit are connected to a first node, the first end of the second subunit is connected to the second power line, the control end of the second subunit is connected to the first light-emitting control signal line, and the first end of the first coupling unit is connected to the first node; In the light emitting stage, the driving method of the pixel circuit includes the following steps: In the light-emitting stage, the second subunit is controlled to be turned on in response to the first light-emitting control signal on the first light-emitting control signal line, the first subunit is controlled to be turned on in response to the potential of the output end of the time control module, and the first power supply voltage on the first power supply line is transmitted to the first node; At the end of light emission, the first subunit is controlled to shut down in response to the potential of the output end of the time control module, and the second subunit is controlled to transmit the second power supply voltage on the second power line to the first node, and the first coupling unit is controlled to adjust the potential of the control end of the time control module to control the potential of the output end of the time control module.

8. The driving method of the pixel circuit according to claim 7, characterized in that: The time control module includes a first driving unit, a second coupling unit, a first compensation unit, a first initialization unit, a reset unit, a first light-emitting control unit and a second light-emitting control unit. The first driving unit is connected between the first power line and the output end of the time control module. The first end of the second coupling unit is connected to the first data line as the data writing end of the time control module, and the second end of the second coupling unit is connected to the control end of the first driving unit. The control end of the first compensation unit is connected to the first scan line, the first end of the first compensation unit is connected to the second end of the first driving unit, and the second end of the first compensation unit is connected to the control end of the first driving unit. The control end of the reset unit is connected to the reset signal line, and the first end of the reset unit is connected to the first initialization signal line. The first light-emitting control unit is connected to the first scanning line, the first end of the first light-emitting control unit is connected to the first power line, the second end of the first light-emitting control unit is connected to the first end of the first driving unit, the control end of the second light-emitting control unit is connected to the first light-emitting control signal line, the first end of the second light-emitting control unit is connected to the first power line, and the second end of the second light-emitting control unit is connected to the first end of the first driving unit; the control end of the first initialization unit is connected to the second scanning line, the first end of the first initialization unit is connected to the second initialization signal line, and the second end of the first initialization unit is connected to the control end of the first driving unit; Before the light emitting stage, the driving method of the pixel circuit includes: In a first initialization phase, the first initialization unit is controlled to be turned on in response to a second scan signal on the second scan line, and a second initialization voltage on the second initialization signal line is transmitted to a control end of the first driving unit; In the compensation stage, the first compensation unit and the first light-emitting control unit are controlled to be turned on in response to the first scanning signal on the first scanning line, so as to transmit the first power supply voltage on the first power line to the control end of the first driving unit through the first compensation unit; In the first data writing phase, the voltage on the first data line is controlled to jump from the first data signal to the frequency sweep signal, and the first data signal is written to the control end of the first driving unit through the second coupling unit; In the reset phase, the reset unit is controlled to be turned on in response to the reset signal on the reset signal line, and the first initialization voltage on the first initialization signal line is transmitted to the output end of the time control module.

9. The driving method of the pixel circuit according to claim 8, characterized in that: The pixel circuit also includes a current control module, which includes a second driving unit, a second compensation unit, a data writing unit and a third light-emitting control unit. The control end of the third light-emitting control unit is the control end of the current control module. The third light-emitting control unit and the second driving unit are connected in series between a third power line and the first end of the light-emitting element. The data writing unit is connected to the second driving unit. The control end of the second compensation unit and the control end of the data writing unit are both connected to a second scan line. The second compensation unit is connected between the second end and the control end of the second driving unit. The data writing unit is connected between the second data line and the first end of the second driving unit. The current control module also includes a fourth light-emitting control unit and a second initialization unit. The control end of the fourth light-emitting control unit is connected to the second light-emitting control signal line. The fourth light-emitting control unit is connected between the second end of the second driving unit and the first end of the light-emitting element. The control end of the second initialization unit is connected to the third scan line. The second initialization unit is connected between the third initialization signal line and the control end of the second driving unit. Before the light emitting stage, the driving method of the pixel circuit further includes: In the second initialization stage, the second initialization unit is controlled to be turned on in response to the third scan signal on the third scan line, and the third initialization voltage on the third initialization signal line is transmitted to the control end of the second driving unit; In the second data writing stage, the data writing unit and the second compensation unit are controlled to be turned on in response to the second scanning signal, respectively, and the second data signal is transmitted to the control end of the second driving unit through the second compensation unit; Preferably, the second data writing phase coincides with the first initialization phase, and the second initialization phase is located before the second data writing phase.

10. A display panel, characterized in that: Comprising the pixel circuit as described in any one of claims 1-5.

Images