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 light emitting time control module, a current control module and a light emitting module, the current control module comprises a first driving unit and a first compensation unit, the first driving unit is used for driving the light-emitting module to emit light according to the voltage of the control end in the light-emitting stage; the first compensation unit is connected between the second end and the control end of the first driving unit, and the first compensation unit is used for writing the voltage on the first power line into the control end of the first driving unit in a first compensation stage so as to perform threshold compensation on the first driving unit; the light-emitting time control module is used for controlling the potential of the control end of the current control module according to the second data voltage and the sweep frequency signal so as to control the light-emitting time of the light-emitting module. According to the scheme, the complexity of the pixel circuit can be reduced, the pixel circuit can be simplified, the signal types of the pixel circuit are reduced, and the PPI of the display panel can be improved.

Description

Technical Field

[0001] The present invention relates 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 quality 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 digital-analog hybrid driving method, the pixel circuit is relatively complex, which is not conducive to improving the PPI of the display panel. Summary of the invention

[0004] The present invention provides a pixel circuit and a driving method thereof and a display panel, so as to simplify the pixel circuit and improve the PPI of the display panel.

[0005] According to one aspect of the present invention, there is provided a pixel circuit, comprising: a light emitting time control module, a current control module and a light emitting module;

[0006] The current control module includes a first driving unit and a first compensation unit. The first driving unit and the light-emitting module are connected between a first power line and a second power line. The first driving unit is used to drive the light-emitting module to emit light according to the voltage of its control end in the light-emitting stage. The first compensation unit is connected between the second end and the control end of the first driving unit. The first compensation unit is used to write the voltage on the first power line to the control end of the first driving unit in the first compensation stage to perform threshold compensation on the first driving unit.

[0007] The output end of the light-emitting time control module is connected to the control end of the current control module. The light-emitting time control module is used to control the potential of the control end of the current control module according to the second data voltage and the sweep signal to control the light-emitting time of the light-emitting module.

[0008] Optionally, the current control module further includes a light emitting control unit, the control end of the first driving unit is connected to the output end of the light emitting time control module as the control end of the current control module, the first end of the first driving unit is connected to the first power line, the second end of the first driving unit is connected to the first end of the light emitting control unit, the second end of the light emitting control unit is connected to the first end of the light emitting module, and the second end of the light emitting module is connected to the second power line;

[0009] Optionally, the first driving unit includes a first transistor, the first compensation unit includes a second transistor, the light emitting control unit includes a third transistor, and the light emitting module includes a light emitting diode; a first electrode of the first transistor is connected to a first power line, a second electrode of the first transistor is connected to a first electrode of the third transistor, a second electrode of the third transistor is connected to a first electrode of the light emitting diode, a second electrode of the light emitting diode is connected to a second power line, and a gate of the third transistor is connected to a light emitting control signal line;

[0010] The gate of the second transistor is connected to the first scan line, the first electrode of the second transistor is connected to the second electrode of the first transistor, and the second electrode of the second transistor is connected to the gate of the first transistor.

[0011] Optionally, the current control module further includes a voltage control unit, a first end of the voltage control unit is connected to the third power line, and a second end of the voltage control unit is connected to the control end of the first driving unit;

[0012] The first power line is used to transmit the first data voltage in the first compensation phase and the first power voltage in the light emitting phase, and the voltage control unit is used to store the voltage of the control terminal of the first driving unit;

[0013] The first compensation unit is further used to write the first data voltage into the control terminal of the first driving unit in a first data writing phase, wherein in a display cycle, the first compensation phase and the first data writing phase overlap.

[0014] Optionally, the current control module further includes a voltage control unit, a first end of the voltage control unit is connected to the first data line, and a second end of the voltage control unit is connected to the control end of the first driving unit;

[0015] The first power line is used to transmit a first power voltage, the first data line is used to transmit a reference voltage before a first data writing phase and to transmit a first data voltage during the first data writing phase, and the voltage control unit is used to couple the first data voltage to the control terminal of the first driving unit during the first data writing phase;

[0016] In one display cycle, the first compensation phase is located before the first data writing phase.

[0017] Optionally, the voltage control unit includes a first capacitor, a first terminal of the first capacitor is a first end of the voltage control unit, and a second terminal of the first capacitor is a second end of the voltage control unit.

[0018] Optionally, the current control module further includes a first initialization unit, a control end of the first initialization unit is connected to the second scan line, a first end of the first initialization unit is connected to the first initialization signal line, a second end of the first initialization unit is connected to the control end of the first driving unit, and the first initialization unit is used to transmit the first initialization voltage on the first initialization signal line to the control end of the first driving unit in the first initialization stage;

[0019] Wherein, within a display cycle, the first initialization phase is located before the first compensation phase;

[0020] Optionally, the first initialization unit includes a fourth transistor, a gate of the fourth transistor is a control terminal of the first initialization unit, a first pole of the fourth transistor is a first terminal of the first initialization unit, and a second pole of the fourth transistor is a second terminal of the first initialization unit.

[0021] Optionally, the light emitting time control module includes a second driving unit, a second initialization unit and a coupling unit;

[0022] The second initialization unit is connected between the second initialization signal line and the control end of the second driving unit, the control end of the second initialization unit is connected to the third scan line, and the second initialization unit is used to transmit the second initialization voltage on the second initialization signal line to the control end of the second driving unit in the second initialization phase;

[0023] The second driving unit is connected between the third power line and the control end of the current control module, the coupling unit is used to couple the second data voltage and the sweep signal to the control end of the second driving unit, and the second driving unit is used to control the voltage of the control end of the current control module according to the voltage of its own control end, so as to control the light-emitting time of the light-emitting module;

[0024] Optionally, the first end of the coupling unit is connected to the second data line, the second end of the coupling unit is connected to the control end of the second driving unit, and the second data line is used to transmit the second data voltage at least in the second data writing phase, and to transmit the sweep signal in the voltage normalization phase and the light emitting phase;

[0025] Optionally, the third scan line is multiplexed as a second initialization signal line.

[0026] Optionally, the light emitting time control module further includes a second compensation unit, a first end of the second compensation unit is connected to the second end of the second driving unit, the second end of the second compensation unit is connected to the control end of the second driving unit, and the control end of the second compensation unit is connected to the fourth scan line;

[0027] The second end of the second driving unit is connected to the control end of the current control module as the output end of the light-emitting time control module, and the first end of the second driving unit is connected to the third power line;

[0028] Optionally, the second driving unit includes a fifth transistor, the second initialization unit includes a sixth transistor, the second compensation unit includes a seventh transistor, the coupling unit includes a second capacitor, the first electrode of the second capacitor is connected to the second data line, the second electrode of the second capacitor is connected to the gate of the fifth transistor, the first electrode of the fifth transistor is connected to the third power line, the second electrode of the fifth transistor is connected to the control end of the current control module, the gate of the sixth transistor is connected to the third scan line, the first electrode of the sixth transistor is connected to the second initialization signal line, the second electrode of the sixth transistor is connected to the gate of the fifth transistor, the gate of the seventh transistor is connected to the fourth scan line, the first electrode of the seventh transistor is connected to the second electrode of the fifth transistor, and the second electrode of the seventh transistor is connected to the gate of the fifth transistor.

[0029] According to another aspect of the present invention, a driving method of a pixel circuit is provided, wherein the pixel circuit comprises a light-emitting time control module, a current control module and a light-emitting module, wherein the current control module comprises a first driving unit and a first compensation unit, wherein the first driving unit and the light-emitting module are connected between a first power line and a second power line, wherein the first compensation unit is connected between a second end of the first driving unit and a control end, and wherein an output end of the light-emitting time control module is connected to a control end of the current control module;

[0030] The driving method of the pixel circuit includes:

[0031] In the first compensation stage, the first compensation unit is controlled to write the voltage on the first power line to the control end of the first driving unit, so as to perform threshold compensation on the first driving unit;

[0032] In the first data writing phase, controlling the first data voltage to be written into the control end of the first driving unit;

[0033] In the light-emitting stage, the first driving unit is controlled to drive the light-emitting module to emit light according to the voltage of its control terminal, and the light-emitting time control module is controlled to control the potential of the control terminal of the current control module according to the second data voltage and the sweep signal to control the light-emitting time of the light-emitting module.

[0034] 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.

[0035] The technical solution provided by the embodiment of the present invention can realize the threshold compensation of the first driving unit by setting the first compensation unit to write the voltage on the first power line to the control end of the first driving unit in the first compensation stage, without the need to perform threshold compensation on the first driving unit through the data writing unit. Therefore, the current control module in this solution does not need to set the data writing unit, and the data writing and threshold compensation of the first driving unit can be realized by reasonably configuring the voltage on the first power line, which can reduce the complexity of the pixel circuit, simplify the pixel circuit, and reduce the signal types of the pixel circuit, which is conducive to improving the PPI of the display panel.

[0036] 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

[0037] 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.

[0038] Figure 1 A schematic structural diagram of a pixel circuit provided by an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0040] Figure 3 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0041] Figure 4 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0042] Figure 5 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0043] Figure 6 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0044] Figure 7 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0045] Figure 8 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0046] Fig. 9 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0047] Fig.10 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0048] Fig.11 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0049] Fig.12 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention;

[0050] Fig.13 A driving timing diagram of another pixel circuit provided by an embodiment of the present invention;

[0051] Fig.14 A flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention;

[0052] Fig.15 A flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention;

[0053] Fig.16 A flowchart of a driving method of a pixel circuit provided by an embodiment of the present invention;

[0054] Fig.17 A schematic structural diagram of a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0055] 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.

[0056] 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.

[0057] 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 a light-emitting time control module 20, a current control module 10 and a light-emitting module 30. The current control module 10 includes a first driving unit 101 and a first compensation unit 102. The first driving unit 101 and the light-emitting module 30 are connected between a first power line L1 and a second power line L2. The first driving unit 101 is used to drive the light-emitting module 30 to emit light according to the voltage of its own control end during the light-emitting stage; the first compensation unit 102 is connected between the second end and the control end of the first driving unit 101. The first compensation unit 102 is used to write the voltage on the first power line L1 to the control end of the first driving unit 101 during the first compensation stage to perform threshold compensation on the first driving unit 101.

[0058] The output end of the luminous time control module 20 is connected to the control end PW of the current control module 10. The luminous time control module 20 is used to control the potential of the control end PW of the current control module 10 according to the second data voltage Vdata_t and the sweep signal SWEEP to control the luminous time of the luminous module 30.

[0059] Specifically, the first driving unit 101 can generate a driving current according to the voltage of its control terminal and the power supply voltage of the first terminal (e.g., the power supply voltage transmitted on the first power line L1) to drive the light-emitting module 30 to emit light in the light-emitting stage. The current control module 10 can control its overall on-off state according to the voltage of its control terminal PW, thereby controlling the on-off of the connection path between the first power line L1 and the second power line L2, and further controlling the light-emitting time of the light-emitting module 30. Among them, the voltage of the control terminal PW of the current control module 10 is controlled by the light-emitting time control module 20, and the light-emitting time control module 20 can control the potential of the control terminal PW of the current control module 10 according to the second data voltage Vdata_t and the sweep signal SWEEP, thereby controlling the voltage of the control terminal PW of the current control module 10.

[0060] Optionally, the current control module 10 may further include a current control subunit 11, and the control terminal PW of the current control module 10 may be the control terminal of the current control subunit 11, and whether the current control module 10 outputs the driving current is controlled by the on-off state of the current control subunit 11 to control the light-emitting time of the light-emitting module 30. The light-emitting module 30 may be prevented from emitting light in the non-light-emitting stage by configuring the voltage on the first power line L1 and / or the second power line L2.

[0061] In this embodiment, in the first compensation stage, the current control subunit 11 is controlled to be turned on, and the threshold compensation of the first driving unit 101 is realized by writing the voltage on the first power line L1 to the control end of the first driving unit 101, without the need to perform threshold compensation through the data writing unit. Therefore, the voltage at the control end of the first driving unit 101 can be controlled by configuring the voltage transmitted on the first power line L1, so that the threshold voltage of the first driving unit 101 can be compensated, and the purpose of data writing can be realized to meet the driving current requirement.

[0062] The technical solution provided by the embodiment of the present invention can realize the threshold compensation of the first driving unit by setting the first compensation unit to write the voltage on the first power line to the control end of the first driving unit in the first compensation stage, without the need to perform threshold compensation on the first driving unit through the data writing unit. Therefore, the current control module in this solution does not need to set the data writing unit, and the data writing and threshold compensation of the first driving unit can be realized by reasonably configuring the voltage on the first power line, which can reduce the complexity of the pixel circuit, simplify the pixel circuit, and reduce the signal types of the pixel circuit, which is conducive to improving the PPI of the display panel.

[0063] Figure 2 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 2As a preferred implementation provided by the embodiment of the present invention, the control end of the first driving unit 101 can be connected to the output end of the light emitting time control module 20 as the control end of the current control module 10, thereby eliminating the need to set Figure 1 The current control subunit 11 shown can further simplify the pixel circuit.

[0064] Further, continue to refer to Figure 2 The pixel circuit also includes a light-emitting control unit 103, a first end of the first driving unit 101 is connected to the first power line L1, a second end of the first driving unit 101 is connected to the first end of the light-emitting control unit 103, a second end of the light-emitting control unit 103 is connected to the first end of the light-emitting module 30, and a second end of the light-emitting module 30 is connected to the second power line L2. The light-emitting control unit 103 is used to conduct the connection path between the first power line L1 and the second power line L2 in the light-emitting stage.

[0065] Figure 3 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 3 ,exist Figure 2 On the basis of the pixel circuit shown in the figure, the current control module 10 in the pixel circuit provided in this embodiment further includes a voltage control unit 104, a first end of the voltage control unit 104 is connected to the third power line L3, and a second end of the voltage control unit 104 is connected to the control end of the first driving unit 101. The third power line L3 is used to transmit the third power supply voltage VDDW.

[0066] Among them, in this embodiment, the voltage transmitted on the first power line L1 is a jump voltage, that is, in the first compensation stage, the first power line L1 transmits the first data voltage Vdata_I; in the light-emitting stage, the first power line L1 transmits the first power voltage VDDA. By multiplexing the first power line L1, the first power line L1 transmits different voltages in different stages to achieve data writing and threshold compensation of the first driving unit 101, so that there is no need to set a data writing unit, which is conducive to simplifying the pixel circuit, saving layout space, and achieving high PPI. Here, the voltage control unit 104 is used to store the voltage of the control end of the first driving unit 101.

[0067] by Figure 3 Taking the pixel circuit shown as an example, within a display cycle, the working process of the pixel circuit at least includes a first compensation stage, a first data writing stage and a light emitting stage, wherein the first compensation stage and the first data writing stage overlap.

[0068] In the first compensation stage and the first data writing stage, the first compensation unit 102 is controlled to be turned on in response to the first scan signal S1 transmitted on the first scan line connected to its control end, and the first data voltage Vdata_I transmitted on the first power line L1 is written to the control end of the first driving unit 101 via the first driving unit 101 and the first compensation unit 102. When the voltage difference between the first end and the control end of the first driving unit 101 is equal to its threshold voltage, the first driving unit 101 is turned off, and the voltage control unit 104 stores the voltage of the control end of the first driving unit 101.

[0069] In the light-emitting stage, the voltage transmitted on the first power line L1 jumps from the first data voltage Vdata_I to the first power voltage VDDA, and the second power line L2 transmits the second power voltage VSS, and controls the light-emitting control unit 103 to respond to the light-emitting control signal EM at its control end to turn on, so that the connection path between the first power line L1 and the second power line L2 is turned on, and the first driving unit 101 generates a driving current according to the voltage of its control end and the first end, and drives the light-emitting module 30 to emit light. The light-emitting time control module 20 is gradually turned on according to the second data voltage Vdata_t and the sweep signal SWEEP, and controls the potential of the control end of the first driving unit 101. When the voltage output by the light-emitting time control module 20 causes the first driving unit 101 to be turned off, the connection path between the first power line L1 and the second power line L2 is disconnected, and the light-emitting module 30 stops emitting light.

[0070] 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 solution, optionally, the current control module 10 further includes a first initialization unit 105, the control end of the first initialization unit 105 is connected to the second scan line, in response to the second scan signal S2 transmitted on the second scan line, the first end of the first initialization unit 105 is connected to the first initialization signal line, the second end of the first initialization unit 105 is connected to the control end of the first driving unit 101, and the first initialization unit 105 is used to transmit the first initialization voltage Vref1 on the first initialization signal line to the control end of the first driving unit 101 in the first initialization stage, so as to control the first driving unit 101 to be turned on.

[0071] In one display cycle, the first initialization phase is located before the first compensation phase, so as to ensure that the first driving unit 101 can be in a conducting state during the first compensation phase.

[0072] Figure 5 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 5On the basis of the above technical solutions, optionally, the light-emitting time control module 20 includes a second driving unit 201, a second initialization unit 202 and a coupling unit 203, the second initialization unit 202 is connected between the second initialization signal line and the control end of the second driving unit 201, the control end of the second initialization unit 202 is connected to the third scanning line, and the second initialization unit 202 is used to transmit the second initialization voltage Vref2 on the second initialization signal line to the control end of the second driving unit 201 in the second initialization stage. The second driving unit 201 is connected between the third power line and the control end PW of the current control module 10, the coupling unit 203 is used to couple the second data voltage Vdata_t and the sweep signal SWEEP to the control end of the second driving unit 201, and the second driving unit 201 is used to control the voltage of the control end PW of the current control module 10 according to the voltage of its own control end, so as to control the light-emitting time of the light-emitting module 30.

[0073] Specifically, the first end of the second driving unit 201 is connected to the third power line L3, and the second end is connected to the control end PW of the current control module 10. The second driving unit 201 can control the voltage of its second end according to the second data voltage Vdata_t written to its control end and the sweep signal SWEEP, thereby controlling the voltage of the control end PW of the current control module 10.

[0074] In this embodiment, the voltage of the control terminal of the second driving unit 201 can be written by the coupling unit 203. In the second initialization stage, the second initialization unit 202 is controlled to be turned on in response to the third scanning signal transmitted on the third scanning line, so as to transmit the second initialization voltage Vref2 to the control terminal of the second driving unit 201, thereby initializing the control terminal of the second driving unit 201. Figure 5 In the pixel circuit shown, the second initialization voltage Vref2 is a voltage that can turn off the second driving unit 201 to ensure the accuracy of the control of the light emitting time. Of course, in other embodiments, by adaptively changing the structure of the pixel circuit, the second initialization voltage Vref2 can also be a voltage that can turn off the second driving unit 201.

[0075] In the second initialization stage, the first end of the coupling unit 203 is also written with the second data voltage Vdata_t. Since the second end of the coupling unit 203 is the second initialization voltage Vref2, there is a voltage difference between the two ends of the coupling unit 203. Afterwards, the voltage at the first end of the coupling unit 203 jumps to the sweep signal SWEEP. Under the coupling action of the coupling unit 203, the voltage change at the first end is coupled to the second end (the coupled voltage will not turn on the second driving unit 201). Therefore, the voltage at the second end of the coupling unit 203 is associated with the second data voltage Vdata_t. That is, the second data voltage Vdata_t is written to the control end of the second driving unit 201. In the light-emitting stage, with the change of the sweep signal SWEEP, the potential of the control end of the second driving unit 201 is pulled to change synchronously to control the on-off state of the second driving unit 201, thereby controlling the potential of the control end of the first driving unit 101.

[0076] In this embodiment, within a display cycle, the second initialization phase is located before the first compensation phase. More specifically, the second initialization phase may be located before the first initialization phase.

[0077] Optionally, in order to further reduce the number of signal lines, the second data voltage Vdata_t and the sweep signal SWEEP may be transmitted using the same signal line. Figure 6 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Figure 6 , the first end of the coupling unit 203 is connected to the second data line DATA2, and the second end of the coupling unit 203 is connected to the control end of the second driving unit 201. The second data line DATA2 is configured to transmit the second data voltage Vdata_t and the sweep signal SWEEP in time-sharing. That is, the second data voltage Vdata_t and the sweep signal SWEEP share the same second data line DATA2, which can reduce the number of signal lines, which is conducive to further reducing the occupied space of the layout, thereby achieving high PPI. The specific working process of the coupling unit 203 will be described in detail in subsequent embodiments.

[0078] Continue to refer Figure 6 Optionally, the luminous time control module 20 also includes a second compensation unit 204, a first end of the second compensation unit 204 is connected to the second end of the second driving unit 201, a second end of the second compensation unit 204 is connected to the control end of the second driving unit 201, and the control end of the second compensation unit 204 is connected to the fourth scan line to respond to the fourth scan signal S4 transmitted on the fourth scan line.

[0079] Among them, relative to Figure 5 , Figure 6The pixel circuit shown in the figure is further provided with a second compensation unit 204 for compensating the threshold voltage of the second driving unit 201 to improve the reliability of the light emission time control. At this time, the second initialization voltage Vref2 transmitted on the second initialization signal line is a voltage that can turn on the second driving unit 201.

[0080] Specifically, for the luminous time control module 20, in the second initialization stage, the second initialization unit 202 is controlled to be turned on in response to the third scanning signal S3, and the second initialization voltage Vref2 is transmitted to the control end of the second driving unit 201 through the second initialization unit 202, and the control end of the second driving unit 201 is initialized, and the second driving unit 201 is turned on.

[0081] In the second compensation stage, the second compensation unit 204 is controlled to be turned on in response to the fourth scanning signal S4, and the third power supply voltage VDDW on the third power supply line L3 is transmitted to the control end of the second driving unit 201 via the second driving unit 201 and the second compensation unit 204. When the voltage at the control end of the second driving unit 201 is equal to the sum of the third power supply voltage VDDW and the threshold voltage of the second driving unit 201, the second driving unit 201 is turned off. At the same time, the second data voltage Vdata_t transmitted on the second data line DATA2 is transmitted to the first end of the coupling unit 203, and a constant voltage difference is maintained at both ends of the coupling unit 203.

[0082] When all pixel rows have completed writing the second data voltage Vdata_t, the second data voltage Vdata_t transmitted on the second data line DATA2 jumps to the sweep signal SWEEP, and keeps the high level (or low level) of the sweep signal SWEEP unchanged, and the coupling unit 203 couples the voltage change at its first end to the second end, that is, the voltage at the control end of the second driving unit 201 is coupled, thereby writing the second data voltage Vdata_t to the control end of the second driving unit 201.

[0083] After entering the light-emitting stage, the first driving unit 101 drives the light-emitting module 30 to emit light according to the voltage of its control terminal. At the same time, the sweep signal SWEEP begins to gradually change from a high level to a low level, or from a low level to a high level, pulling the potential of the control terminal of the second driving unit 201. When the second driving unit 201 is turned on in response to the potential of its control terminal, the third power supply voltage VDDW is transmitted to the control terminal of the first driving unit 101, so that the first driving unit 101 is turned off, thereby controlling the light-emitting module 30 to stop emitting light, thereby realizing the control of the light-emitting time.

[0084] Figure 7 A schematic diagram of another pixel circuit structure provided by an embodiment of the present invention, specifically: Figure 6 The pixel circuit shown is refined into a schematic diagram of the device, refer to Figure 7 The first driving unit 101 includes a first transistor M1, the first compensation unit 102 includes a second transistor M2, the light-emitting control unit 103 includes a third transistor M3, and the light-emitting module 30 includes a light-emitting diode D1; a first electrode of the first transistor M1 is connected to the first power line L1, a second electrode of the first transistor M1 is connected to the first electrode of the third transistor M3, a second electrode of the third transistor M3 is connected to the first electrode of the light-emitting diode D1, a second electrode of the light-emitting diode D1 is connected to the second power line L2, and a gate of the third transistor M3 is connected to the light-emitting control signal line; a gate of the second transistor M2 is connected to the first scanning line, a first electrode of the second transistor M2 is connected to the second electrode of the first transistor M1, and a second electrode of the second transistor M2 is connected to the gate of the first transistor M1.

[0085] The voltage control unit 104 includes a first capacitor C1 , a first terminal of the first capacitor C1 being connected to the third power line L3 , and a second terminal of the first capacitor C1 being connected to the gate of the first transistor M1 .

[0086] The first initialization unit 105 includes a fourth transistor M4, a gate of the fourth transistor M4 is a control end of the first initialization unit 105 connected to the second scan line, a first pole of the fourth transistor M4 is a first end of the first initialization unit 105 connected to the first initialization signal line, and a second pole of the fourth transistor M4 is a second end of the first initialization unit 105 connected to the gate of the first transistor M1.

[0087] The second driving unit 201 includes a fifth transistor M5, the second initialization unit 202 includes a sixth transistor M6, the second compensation unit 204 includes a seventh transistor M7, the coupling unit 203 includes a second capacitor C2, a first electrode of the second capacitor C2 is connected to the second data line DATA2, a second electrode of the second capacitor C2 is connected to the gate of the fifth transistor M5, a first electrode of the fifth transistor M5 is connected to the third power line L3, a second electrode of the fifth transistor M5 is connected to the control end PW of the current control module 10 (i.e., the gate of the first transistor M1), a gate of the sixth transistor M6 is connected to the third scan line, a first electrode of the sixth transistor M6 is connected to the second initialization signal line, a second electrode of the sixth transistor M6 is connected to the gate of the fifth transistor M5, a gate of the seventh transistor M7 is connected to the fourth scan line, a first electrode of the seventh transistor M7 is connected to the second electrode of the fifth transistor M5, and a second electrode of the seventh transistor M7 is connected to the gate of the fifth transistor M5.

[0088] Figure 8 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention can be applied to Figure 7In the pixel circuit shown, taking all transistors as P-type transistors as an example, the working process of the pixel circuit provided by this embodiment is as follows:

[0089] In the second initialization stage t1, the first scan signal S1 is at an off level, such as a high level; the second scan signal S2 is at an off level, such as a high level; the third scan signal S3 is at an on level, such as a low level; the fourth scan signal S4 is at an off level, such as a high level; and the light-emitting control signal EM is at an off level, such as a high level. Therefore, the sixth transistor M6 is turned on, and the second initialization voltage Vref2 on the second initialization signal line is transmitted to the gate of the fifth transistor M5 via the sixth transistor M6, so as to initialize the gate potential of the fifth transistor M5. At the same time, the fifth transistor M5 is in a conducting state. Since the fifth transistor M5 is turned on, the third power supply voltage VDDW on the third power supply line L3 is transmitted to the gate of the first transistor M1, so that the first transistor M1 is turned off.

[0090] In the second compensation stage t2, the first scan signal S1 is at an off level, such as a high level; the second scan signal S2 is at an off level, such as a high level; the third scan signal S3 is at an off level, such as a high level; the fourth scan signal S4 is at an on level, such as a low level; and the light-emitting control signal EM is at an off level, such as a high level. Therefore, the seventh transistor M7 is turned on, and the third power supply voltage VDDW is transmitted to the gate of the fifth transistor M5 through the fifth transistor M5 and the seventh transistor M7, and the gate of the fifth transistor M5 is charged until the gate voltage of the fifth transistor M5 is VDDW+Vth5, and the fifth transistor M5 is turned off. Wherein, Vth5 is the threshold voltage of the fifth transistor M5. At the same time, the second data voltage Vdata_t on the second data line DATA2 is transmitted to the first electrode of the second capacitor C2, and the voltage difference across the second capacitor C2 is VDDW+Vth5-Vdata_t.

[0091] In the stage t3, the remaining rows of pixels sequentially perform the second initialization stage t1 and the second compensation stage t2, and only after they are completed can the data of all the pixel rows be written.

[0092] In the voltage normalization phase t4, the second data voltage Vdata_t transmitted on the second data line DATA2 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 second data voltage Vdata_t. The voltage at the first end of the second capacitor C2 is pulled up to SWEEP-H, and under the coupling effect of the second capacitor C2, the voltage at the second end of the second capacitor C2 becomes VDDW+Vth5-Vdata_t+SWEEP-H, and the second data voltage Vdata_t is written to the gate of the fifth transistor M5, and the fifth transistor M5 is turned off.

[0093] In the first initialization stage t5, the first scanning signal S1 is at an off level, such as a high level; the second scanning signal S2 is at an on level, such as a low level; the third scanning signal S3 is at an off level, such as a high level; the fourth scanning signal S4 is at an off level, such as a high level; and the light emitting control signal EM is at an off level, such as a high level. Therefore, the fourth transistor M4 is turned on, and the first initialization voltage Vref1 on the first initialization signal line is transmitted to the gate of the first transistor M1, and the gate potential of the first transistor M1 is initialized, and the first transistor M1 is turned on.

[0094] In the first compensation stage t6, the first scan signal S1 is at a conduction level, such as a low level; the second scan signal S2 is at a turn-off level, such as a high level; the third scan signal S3 is at a turn-off level, such as a high level; the fourth scan signal S4 is at a turn-off level, such as a high level; and the light-emitting control signal EM is at a turn-off level, such as a high level. Therefore, the second transistor M2 is turned on, and the first data voltage Vdata_I transmitted on the first power line L1 is written to the gate of the first transistor M1 through the first transistor M1 and the second transistor M2 until the gate voltage of the first transistor M1 is Vdata_I+Vth1, and the first transistor M1 is turned off, thereby realizing data writing and threshold compensation of the first transistor M1. Among them, Vth1 is the threshold voltage of the first transistor M1. The first capacitor C1 stores the gate voltage of the first transistor M1. Here, the data writing and threshold compensation processes of the first transistor M1 are carried out simultaneously, and there is no need to set a data writing transistor and a corresponding data line, which is conducive to simplifying the pixel circuit and reducing the layout area occupied by the pixel circuit.

[0095] In the light-emitting stage t7, the voltage on the first power line L1 jumps from the first data voltage Vdata_I to the first power voltage VDDA, the first scan signal S1 is at an off level, such as a high level; the second scan signal S2 is at an off level, such as a high level; the third scan signal S3 is at an off level, such as a high level; the fourth scan signal S4 is at an off level, such as a high level; and the light-emitting control signal EM is at an on level, such as a low level. Therefore, the third transistor M3 is turned on, the connection path between the first power line L1 and the second power line L2 is turned on, and the first transistor M1 generates a driving current Id to drive the light-emitting diode D1 to emit light. The driving current Id can be expressed by the following formula:

[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, and Vth1 is the threshold voltage of the first transistor M1. In this embodiment, the light emitting diode D1 may include one or more of OLED, Micro-LED and Mini-LED.

[0098] In the light-emitting stage t7, the sweep signal SWEEP gradually changes from the high level SWEEP-H to the low level SWEEP-L, and due to the coupling effect of the second capacitor C2, the gate potential of the fifth transistor M5 changes synchronously. When the sweep signal SWEEP decreases so that the gate potential of the fifth transistor M5 is equal to VDDW+Vth5, the fifth transistor M5 is turned on, and the third power supply voltage VDDW is transmitted to the gate of the first transistor M1 through the fifth transistor M5, controlling the first transistor M1 to be turned off. Therefore, the first electrode of the first transistor M1 is disconnected from the first power line L1, the driving current is zero, and the light-emitting module 30 is turned off, realizing the control of the light-emitting time.

[0099] The technical solution provided by the embodiment of the present invention can realize threshold compensation and data writing of the first transistor M1 by multiplexing the first power line L1 to transmit the first data voltage Vdata_I and the first power supply voltage VDDA in time-sharing manner, without setting a data writing transistor. Compared with the pixel circuit of the 12T2C architecture in the related art, the present solution only uses 7T2C to realize precise control of the light-emitting time of the light-emitting module 30, which greatly reduces the number of transistors and the number of signal lines, and is conducive to achieving high PPI.

[0100] 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 solution, optionally, the third scan line can be reused as the second initialization signal line, that is, the gate of the sixth transistor M6 and the first electrode are short-circuited to form a diode structure and connected to the third scan line. When the sixth transistor M6 is turned on in response to the third scan signal S3, the conduction level of the third scan signal S3 is transmitted to the gate of the fifth transistor M5, so as to initialize the gate potential of the fifth transistor M5. Fig. 9 The working process of the pixel circuit shown is similar to Figure 7 The working process of the pixel circuit shown is the same and will not be repeated here.

[0101] Optionally, the data writing and threshold compensation processes of the first driving unit 101 may also be performed separately. Fig.10 A schematic diagram of another pixel circuit provided by an embodiment of the present invention, referring to Fig.10, a first end of the voltage control unit 104 is connected to the first data line DATA1, and a second end of the voltage control unit 104 is connected to the control end of the first driving unit 101. The first power line L1 is used to transmit the first power voltage VDDA, the first data line DATA1 is used to transmit the reference voltage VCOM before the first data writing phase, and to transmit the first data voltage Vdata_I in the first data writing phase, and the voltage control unit 104 is used to couple the first data voltage Vdata_I to the control end of the first driving unit 101 in the first data writing phase.

[0102] In one display cycle, the first compensation phase is located before the first data writing phase.

[0103] Fig.11 A schematic diagram of the structure of another pixel circuit provided by an embodiment of the present invention, Fig.11 and Figure 6 The difference between the pixel circuits shown is that the connection mode of the voltage control unit 104 is different, and the voltage transmitted by the first power line L1 is different. Fig.11 The working process of other modules or units in the pixel circuit shown can refer to Figure 6 Related description.

[0104] Fig.12 A schematic diagram of another pixel circuit structure provided by an embodiment of the present invention, specifically: Fig.11 The pixel circuit shown is a schematic diagram of the device structure. The connection relationship between each device can be referred to Figure 7 The relevant description in will not be repeated here. Fig.13 Another driving timing diagram of a pixel circuit provided in an embodiment of the present invention can be applied to Fig.12 The pixel circuit shown in FIG. 1 is a circuit in which the voltage transmitted on the first power line L1 is the first power voltage VDDA. Fig.12 and Fig.13 , the working process of the pixel circuit is as follows:

[0105] The working process of the second initialization stage t1, the second compensation stage t2, the stage t3, the voltage normalization stage t4 and the first initialization stage t5 is the same as Figure 6 The working process of the pixel circuit shown is the same, and reference can be made to the above technical solution for Figure 6 Related description.

[0106] In the first compensation stage t6, the first scanning signal S1 is at a conduction level, such as a low level; the second scanning signal S2 is at a cut-off level, such as a high level; the third scanning signal S3 is at a cut-off level, such as a high level; the fourth scanning signal S4 is at a cut-off level, such as a high level; and the light-emitting control signal EM is at a cut-off level, such as a high level. Therefore, the second transistor M2 is turned on, and the first power supply voltage VDDA transmitted on the first power line L1 is written to the gate of the first transistor M1 through the first transistor M1 and the second transistor M2, until the gate voltage of the first transistor M1 is VDDA+Vth1, the first transistor M1 is turned off, and the data writing and threshold compensation of the first transistor M1 are realized. Wherein, Vth1 is the threshold voltage of the first transistor M1. The first capacitor C1 stores the gate voltage of the first transistor M1.

[0107] Until the first compensation stage t6 , the voltage transmitted on the first data line DATA1 is always the reference voltage VCOM, so that the first capacitor C1 stores the gate voltage of the first transistor M1 .

[0108] In the first data writing stage t6', the voltage transmitted on the first data line DATA1 jumps from the reference voltage VCOM to the first data voltage Vdata_I. According to the principle that the voltage difference across the first capacitor C1 remains unchanged, the gate voltage of the first transistor M1 is coupled to VDDA+Vth1-VCOM+Vdata_I, thereby realizing that the voltage containing the first data voltage Vdata_I information is written to the gate of the first transistor M1.

[0109] In the light-emitting stage t7, the first power line L1 transmits the first power supply voltage VDDA, the first scan signal S1 is at an off level, such as a high level; the second scan signal S2 is at an off level, such as a high level; the third scan signal S3 is at an off level, such as a high level; the fourth scan signal S4 is at an off level, such as a high level; and the light-emitting control signal EM is at an on level, such as a low level. Therefore, the third transistor M3 is turned on, the connection path between the first power line L1 and the second power line L2 is turned on, and the first transistor M1 generates a driving current Id to drive the light-emitting diode D1 to emit light. The driving current Id can be expressed by the following formula:

[0110]

[0111] Therefore, by properly setting the voltage value of the reference voltage VCOM, Fig.12 The pixel circuit shown is Figure 7 The pixel circuits shown have the same drive current value.

[0112] The technical solution provided by this embodiment is to set a first data line DATA1 separately for transmitting the first data voltage Vdata_I, so as to prevent interference between the first data voltage Vdata_I and the first power supply voltage VDDA, and to independently control the first data voltage Vdata_I and the first power supply voltage VDDA, so as to flexibly set the relevant voltage parameters. This solution does not need to increase the number of transistors, does not increase the layout difficulty of the pixel circuit, and can also achieve a higher PPI.

[0113] The inventor has experimentally verified that any embodiment provided by the present invention can meet the display requirements of 300PPI and above.

[0114] The embodiment of the present invention further provides a method for driving a pixel circuit, which can drive the pixel circuit provided by any embodiment of the present invention. Figure 1 The pixel circuit includes a light-emitting time control module 20, a current control module 10 and a light-emitting module 30. The current control module 10 includes a first driving unit 101 and a first compensation unit 102. The first driving unit 101 and the light-emitting module 30 are connected between a first power line L1 and a second power line L2. The first compensation unit 102 is connected between the second end and the control end of the first driving unit 101. The output end of the light-emitting time control module 20 is connected to the control end PW of the current control module 10. Fig.14 A flowchart of a driving method for a pixel circuit provided by an embodiment of the present invention, combined with Fig.14 , the driving method of the pixel circuit includes:

[0115] S110 , in a first compensation stage, controlling the first compensation unit to write the voltage on the first power line to the control end of the first driving unit to perform threshold compensation on the first driving unit.

[0116] S120 , in a first data writing phase, controlling a first data voltage to be written into a control terminal of a first driving unit.

[0117] S130, in the light-emitting stage, controlling the first driving unit to drive the light-emitting module to emit light according to the voltage of its own control terminal, and controlling the light-emitting time control module to control the potential of the control terminal of the current control module according to the second data voltage and the sweep signal, so as to control the light-emitting time of the light-emitting module.

[0118] The technical solution provided by the embodiment of the present invention can realize the threshold compensation of the first driving unit by setting the first compensation unit to write the voltage on the first power line to the control end of the first driving unit in the first compensation stage, without the need to perform threshold compensation on the first driving unit through the data writing unit. Therefore, the current control module in this solution does not need to set the data writing unit, and the data writing and threshold compensation of the first driving unit can be realized by reasonably configuring the voltage on the first power line, which can reduce the complexity of the pixel circuit, simplify the pixel circuit, and reduce the signal types of the pixel circuit, which is conducive to improving the PPI of the display panel.

[0119] Optionally, combined Figure 4 The current control module 10 further includes a first initialization unit 105, a control end of the first initialization unit 105 is connected to the second scan line, in response to the second scan signal S2 transmitted on the second scan line, a first end of the first initialization unit 105 is connected to the first initialization signal line, and a second end of the first initialization unit 105 is connected to the control end of the first driving unit 101. The control end of the first driving unit 101 is connected to the output end of the light emitting time control module 20 as the control end PW of the current control module 10. Fig.15 A flowchart of a driving method for a pixel circuit provided by an embodiment of the present invention, combined with Fig.15 , the driving method of the pixel circuit includes:

[0120] S210 , in a first initialization stage, controlling the first initialization unit to transmit a first initialization voltage on a first initialization signal line to a control end of a first driving unit.

[0121] S1101 , in a first compensation phase and a first data writing phase, controlling a first compensation unit to write a first data voltage on a first power line to a control end of a first driving unit, so as to perform data writing and threshold compensation on the first driving unit.

[0122] S130, in the light-emitting stage, controlling the first driving unit to drive the light-emitting module to emit light according to the voltage of its own control terminal, and controlling the light-emitting time control module to control the potential of the control terminal of the current control module according to the second data voltage and the sweep signal, so as to control the light-emitting time of the light-emitting module.

[0123] in, Fig.15 The working principle of the driving method of the pixel circuit shown can be referred to Figure 7 The pixel circuit is specifically described and has the beneficial effects described in any of the above embodiments.

[0124] Optionally, combined Fig.10A first end of the voltage control unit 104 is connected to the first data line DATA1 , and a second end of the voltage control unit 104 is connected to the control end of the first driving unit 101 . Fig.16 A flowchart of a driving method for a pixel circuit provided by an embodiment of the present invention, combined with Fig.16 , the driving method of the pixel circuit includes:

[0125] S210 , in a first initialization stage, controlling the first initialization unit to transmit a first initialization voltage on a first initialization signal line to a control end of a first driving unit.

[0126] S1102 . In a first compensation stage, control the first compensation unit to write the first power supply voltage on the first power supply line to the control end of the first driving unit to perform threshold compensation on the first driving unit.

[0127] S1201. In a first data writing phase, the voltage transmitted on the first data line is controlled to jump from a reference voltage to a first data voltage, and the voltage control unit couples the voltage containing the first data voltage information to the control end of the first driving unit.

[0128] S130, in the light-emitting stage, controlling the first driving unit to drive the light-emitting module to emit light according to the voltage of its own control terminal, and controlling the light-emitting time control module to control the potential of the control terminal of the current control module according to the second data voltage and the sweep signal, so as to control the light-emitting time of the light-emitting module.

[0129] in, Fig.16 The working principle of the driving method of the pixel circuit shown can be referred to Fig.12 The pixel circuit is specifically described and has the beneficial effects described in any of the above embodiments.

[0130] 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.17 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.17 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.

[0131] 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.

[0132] 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: Lighting time control module, current control module and light-emitting module; The current control module includes a first driving unit and a first compensation unit, wherein the first driving unit and the light-emitting module are connected between a first power line and a second power line, and the first driving unit is used to drive the light-emitting module to emit light according to the voltage of its control end in the light-emitting stage; the first compensation unit is connected between the second end and the control end of the first driving unit, and the first compensation unit is used to write the voltage on the first power line to the control end of the first driving unit in the first compensation stage, so as to perform threshold compensation on the first driving unit; The output end of the light-emitting time control module is connected to the control end of the current control module, and the light-emitting time control module is used to control the potential of the control end of the current control module according to the second data voltage and the sweep signal to control the light-emitting time of the light-emitting module.

2. The pixel circuit according to claim 1, characterized in that: The current control module further includes a light emitting control unit, wherein the control end of the first driving unit is connected to the output end of the light emitting time control module as the control end of the current control module, the first end of the first driving unit is connected to the first power line, the second end of the first driving unit is connected to the first end of the light emitting control unit, the second end of the light emitting control unit is connected to the first end of the light emitting module, and the second end of the light emitting module is connected to the second power line; Preferably, the first driving unit includes a first transistor, the first compensation unit includes a second transistor, the light emitting control unit includes a third transistor, and the light emitting module includes a light emitting diode; The first electrode of the first transistor is connected to the first power line, the second electrode of the first transistor is connected to the first electrode of the third transistor, the second electrode of the third transistor is connected to the first electrode of the light emitting diode, the second electrode of the light emitting diode is connected to the second power line, and the gate of the third transistor is connected to the light emitting control signal line; A gate of the second transistor is connected to the first scan line, a first electrode of the second transistor is connected to a second electrode of the first transistor, and a second electrode of the second transistor is connected to a gate of the first transistor.

3. The pixel circuit according to claim 1, characterized in that: The current control module further includes a voltage control unit, a first end of the voltage control unit is connected to the third power line, and a second end of the voltage control unit is connected to the control end of the first driving unit; The first power line is used to transmit a first data voltage in the first compensation phase and to transmit a first power voltage in the light emitting phase, and the voltage control unit is used to store a voltage at a control end of the first driving unit; Preferably, the first compensation unit is further used for writing the first data voltage into the control end of the first driving unit in a first data writing phase, wherein in a display cycle, the first compensation phase and the first data writing phase overlap.

4. The pixel circuit according to claim 1, characterized in that: The current control module further includes a voltage control unit, a first end of the voltage control unit is connected to the first data line, and a second end of the voltage control unit is connected to the control end of the first driving unit; The first power line is used to transmit a first power voltage, the first data line is used to transmit a reference voltage before a first data writing phase and to transmit a first data voltage during the first data writing phase, and the voltage control unit is used to couple the first data voltage to a control terminal of the first driving unit during the first data writing phase; Preferably, within a display cycle, the first compensation phase is located before the first data writing phase.

5. The pixel circuit according to claim 3 or 4, characterized in that: The voltage control unit includes a first capacitor, a first pole of the first capacitor is a first end of the voltage control unit, and a second pole of the first capacitor is a second end of the voltage control unit.

6. The pixel circuit according to claim 1, characterized in that: The current control module further includes a first initialization unit, wherein a control end of the first initialization unit is connected to the second scan line, a first end of the first initialization unit is connected to the first initialization signal line, a second end of the first initialization unit is connected to the control end of the first driving unit, and the first initialization unit is used to transmit a first initialization voltage on the first initialization signal line to the control end of the first driving unit in a first initialization phase; Preferably, in a display cycle, the first initialization phase is located before the first compensation phase; Preferably, the first initialization unit includes a fourth transistor, a gate of the fourth transistor is a control terminal of the first initialization unit, a first pole of the fourth transistor is a first terminal of the first initialization unit, and a second pole of the fourth transistor is a second terminal of the first initialization unit.

7. The pixel circuit according to claim 1, characterized in that: The light-emitting time control module includes a second driving unit, a second initialization unit and a coupling unit; The second initialization unit is connected between the second initialization signal line and the control end of the second driving unit, the control end of the second initialization unit is connected to the third scan line, and the second initialization unit is used to transmit the second initialization voltage on the second initialization signal line to the control end of the second driving unit in the second initialization phase; The second driving unit is connected between the third power line and the control end of the current control module, the coupling unit is used to couple the second data voltage and the frequency sweep signal to the control end of the second driving unit, and the second driving unit is used to control the voltage of the control end of the current control module according to the voltage of its own control end, so as to control the light-emitting time of the light-emitting module; Preferably, the first end of the coupling unit is connected to the second data line, the second end of the coupling unit is connected to the control end of the second driving unit, and the second data line is used to transmit the second data voltage at least in the second data writing phase, and transmit the frequency sweeping signal in the voltage normalization phase and the light emitting phase; Preferably, the third scan line is multiplexed as the second initialization signal line.

8. The pixel circuit according to claim 7, characterized in that: The light emitting time control module further includes a second compensation unit, a first end of the second compensation unit is connected to a second end of the second driving unit, a second end of the second compensation unit is connected to a control end of the second driving unit, and a control end of the second compensation unit is connected to a fourth scan line; Wherein, the second end of the second driving unit is connected to the control end of the current control module as the output end of the light-emitting time control module, and the first end of the second driving unit is connected to the third power line; Preferably, the second driving unit includes a fifth transistor, the second initialization unit includes a sixth transistor, the second compensation unit includes a seventh transistor, the coupling unit includes a second capacitor, the first electrode of the second capacitor is connected to the second data line, the second electrode of the second capacitor is connected to the gate of the fifth transistor, the first electrode of the fifth transistor is connected to the third power line, the second electrode of the fifth transistor is connected to the control end of the current control module, the gate of the sixth transistor is connected to the third scan line, the first electrode of the sixth transistor is connected to the second initialization signal line, the second electrode of the sixth transistor is connected to the gate of the fifth transistor, the gate of the seventh transistor is connected to the fourth scan line, the first electrode of the seventh transistor is connected to the second electrode of the fifth transistor, and the second electrode of the seventh transistor is connected to the gate of the fifth transistor.

9. A method for driving a pixel circuit, characterized in that: The pixel circuit includes a light-emitting time control module, a current control module and a light-emitting module, the current control module includes a first driving unit and a first compensation unit, the first driving unit and the light-emitting module are connected between a first power line and a second power line, the first compensation unit is connected between the second end and the control end of the first driving unit, and the output end of the light-emitting time control module is connected to the control end of the current control module; The driving method of the pixel circuit includes: In a first compensation stage, controlling the first compensation unit to write the voltage on the first power line to the control end of the first driving unit to perform threshold compensation on the first driving unit; In the first data writing phase, controlling the first data voltage to be written into the control end of the first driving unit; In the light-emitting stage, the first driving unit is controlled to drive the light-emitting module to emit light according to the voltage of its own control end, and the light-emitting time control module is controlled to control the potential of the control end of the current control module according to the second data voltage and the sweep signal, so as to control the light-emitting time of the light-emitting module.

10. A display panel, characterized in that: Comprising the pixel circuit as described in any one of claims 1-8.

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