Pixel Circuit, Driving Method Thereof, and Display Panel

Abstract

Embodiments of the present invention disclose a pixel circuit, a driving method thereof, and a display panel. The pixel circuit includes: a driving transistor, a compensation module, a leakage current control module, a data writing module, a storage module, and a light emitting control module; wherein, the compensation module is configured to compensate the threshold voltage of the driving transistor; the leakage current control module is configured to initialize the gate voltage of the driving transistor in response to a signal at its control terminal, and control the leakage current between the gate of the driving transistor and a first initialization signal terminal; the data writing module is configured to control the signal at the control terminal of the leakage current control module according to the signal at a data voltage terminal in response to a signal at its control terminal; the storage module is configured to store the voltages of the gate of the driving transistor and the control terminal of the leakage current control module respectively. Compared with the prior art, the embodiments of the present invention help to optimize the display effect of the display panel and improve the flexibility of gray scale control of the display panel.

Description

Technical Field

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

[0002] With the continuous development of display technologies, people have higher and higher requirements for the performance of display panels. A display panel includes pixel circuits. Currently, due to problems such as voltage drops in the power supply signals of pixel circuits and characteristic differences in transistors in pixel circuits, the display effect of the display panel is poor, which affects the performance of the display panel. Summary of the Invention

[0003] Embodiments of the present invention provide a pixel circuit, a driving method thereof, and a display panel to optimize the display effect of the display panel and improve the flexibility of gray-scale control.

[0004] In a first aspect, embodiments of the present invention provide a pixel circuit, including:

[0005] A driving transistor, configured to generate a driving current in response to a signal on its gate to drive a light-emitting device to emit light;

[0006] A compensation module, connected between the gate and the second pole of the driving transistor, configured to compensate for the threshold voltage of the driving transistor;

[0007] A leakage current control module, connected between the gate of the driving transistor and a first initialization signal terminal, configured to initialize the gate voltage of the driving transistor in response to a signal on its control terminal, and control the leakage current between the gate of the driving transistor and the first initialization signal terminal;

[0008] A data writing module, connected to a power supply voltage terminal, a data voltage terminal, and the control terminal of the leakage current control module, configured to control the signal on the control terminal of the leakage current control module according to the signal on the data voltage terminal in response to a signal on its control terminal;

[0009] A storage module, connected to the power supply voltage terminal, the gate of the driving transistor, and the control terminal of the leakage current control module, configured to store the voltages of the gate of the driving transistor and the control terminal of the leakage current control module respectively;

[0010] A light emission control module, connected between the second pole of the driving transistor and the light-emitting device, configured to turn on or off the driving transistor and the light-emitting device in response to a light emission control signal.

[0011] Optionally, the data writing module includes a data writing unit and a coupling unit;

[0012] The control terminal of the data writing unit serves as the control terminal of the data writing module. The first terminal of the data writing unit is connected to the data voltage terminal, and the second terminal of the data writing unit is connected to the first terminal of the coupling unit, and is configured to write the signal of the data voltage terminal to the first terminal of the coupling unit in response to the signal of its control terminal;

[0013] The second terminal of the coupling unit is connected to the control terminal of the leakage control module, and is configured to couple the signal of the control terminal of the leakage control module according to the voltage jump of the data voltage terminal;

[0014] Preferably, the data writing unit includes a first transistor, and the coupling unit includes a first capacitor; the gate of the first transistor serves as the control terminal of the data writing unit and is connected to the first scan signal terminal, the first pole of the first transistor is connected to the data voltage terminal, the second pole of the first transistor is connected to the first electrode of the first capacitor, and the second electrode of the first capacitor is connected to the control terminal of the leakage control module;

[0015] Preferably, the data writing module further includes a storage unit, and the storage unit is connected between the power supply voltage terminal and the first terminal of the coupling unit, and is configured to store the voltage of the first terminal of the coupling unit;

[0016] Preferably, the storage unit includes a second capacitor, and the second capacitor is connected between the power supply voltage terminal and the first electrode of the first capacitor.

[0017] Optionally, the leakage control module includes a second transistor and a third transistor;

[0018] The gate of the second transistor serves as the control terminal of the leakage control module, the first pole of the second transistor is connected to the first initialization signal terminal, and the second pole of the second transistor is connected to the gate of the driving transistor;

[0019] The gate of the third transistor is connected to the second scan signal terminal, the first pole of the third transistor is connected to the first pole of the second transistor, and the second pole of the third transistor is connected to the gate of the second transistor.

[0020] Optionally, the driving current generated by the driving transistor is positively correlated with the voltage jump amount of the data voltage terminal;

[0021] Preferably, the current of the second transistor is expressed as:

[0022]

[0023] The driving current generated by the driving transistor is expressed as:

[0024]

[0025] Among them, I ds2 is the current of the second transistor, I ds is the driving current generated by the driving transistor, W is the channel width of the transistor, L is the channel length of the transistor, μ is the electron mobility of the transistor, C OX is the channel capacitance per unit area of the transistor, ΔV is the voltage jump of the data voltage terminal, V(t) is the change in the gate voltage of the driving transistor, and V(t) is positively correlated with I ds2 is positively correlated.

[0026] Optionally, the pixel circuit further includes:

[0027] An initialization module, connected between the second initialization signal terminal and the control terminal of the leakage control module, for initializing the voltage of the control terminal of the leakage control module;

[0028] Preferably, the initialization module includes a fourth transistor, the gate of the fourth transistor is connected to the third scan signal terminal, the first pole of the fourth transistor is connected to the second initialization signal terminal, and the second pole of the fourth transistor is connected to the control terminal of the leakage control module.

[0029] Optionally, the storage module includes a third capacitor and a fourth capacitor, the third capacitor is connected between the power supply voltage terminal and the control terminal of the leakage control module, and the fourth capacitor is connected between the power supply voltage terminal and the gate of the driving transistor;

[0030] The compensation module includes a fifth transistor, the gate of the fifth transistor is connected to the second scan signal terminal, the first pole of the fifth transistor is connected to the second pole of the driving transistor, and the second pole of the fifth transistor is connected to the gate of the driving transistor;

[0031] The light emission control module includes a sixth transistor, the gate of the sixth transistor is connected to the light emission control signal terminal, the first pole of the sixth transistor is connected to the second pole of the driving transistor, and the second pole of the sixth transistor is connected to the first pole of the light emitting device;

[0032] Preferably, it further includes a seventh transistor, the gate of the seventh transistor is connected to the fourth scan signal terminal, the first pole of the seventh transistor is connected to the power supply voltage terminal, and the second pole of the seventh transistor is connected to the first pole of the driving transistor.

[0033] In a second aspect, an embodiment of the present invention further provides a display panel, including the pixel circuit described in the first aspect.

[0034] In a third aspect, an embodiment of the present invention further provides a driving method for a pixel circuit. The pixel circuit includes a driving transistor; a compensation module connected between the gate and the second pole of the driving transistor for compensating the threshold voltage of the driving transistor; a leakage current control module connected between the gate of the driving transistor and a first initialization signal terminal; a data writing module connected to a power supply voltage terminal, a data voltage terminal, and the control terminal of the leakage current control module; a storage module connected to the power supply voltage terminal, the gate of the driving transistor, and the control terminal of the leakage current control module for storing the voltages of the gate of the driving transistor and the control terminal of the leakage current control module respectively; a light emission control module connected between the second pole of the driving transistor and the light emitting device for turning on or off the driving transistor and the light emitting device in response to a light emission control signal.

[0035] The working phases of the pixel circuit include an initialization phase, a power supply voltage compensation phase, a data voltage writing phase, and a light emission phase. The driving method for the pixel circuit includes:

[0036] In the initialization phase, the gate voltage of the driving transistor is initialized by the leakage current control module in response to the signal at its control terminal.

[0037] In the power supply voltage compensation phase, the voltages of the control terminal of the leakage current control module and the gate of the driving transistor are compensated by the power supply voltage applied through the power supply voltage terminal.

[0038] In the data voltage writing phase, the control signal of the control terminal of the leakage current control module is controlled by the data writing module in response to the signal at its control terminal according to the signal at the data voltage terminal.

[0039] In the light emission phase, the driving transistor and the light emitting device are turned on by the light emission control module in response to the light emission control signal, and the leakage current between the gate of the driving transistor and the first initialization signal terminal is controlled by the leakage current control module in response to the signal at its control terminal, so as to generate a driving current through the driving transistor in response to the signal at its gate to drive the light emitting device to emit light.

[0040] Optionally, the data writing module includes a data writing unit and a coupling unit. The control terminal of the data writing unit serves as the control terminal of the data writing module. The first terminal of the data writing unit is connected to the data voltage terminal, and the second terminal of the data writing unit is connected to the first terminal of the coupling unit for writing the signal at the data voltage terminal into the first terminal of the coupling unit in response to the signal at its control terminal. The second terminal of the coupling unit is connected to the control terminal of the leakage current control module for coupling the signal of the control terminal of the leakage current control module according to the voltage jump at the data voltage terminal.

[0041] The driving method of the pixel circuit further includes:

[0042] In the initialization stage and the power supply voltage compensation stage, a first data voltage is applied to the data voltage terminal, so that the first data voltage is written into the first end of the coupling unit through the data writing unit, and the voltage of the first end of the coupling unit is initialized;

[0043] In the data voltage writing stage, a second data voltage is applied to the data voltage terminal, so that the second data voltage is written into the first end of the coupling unit through the data writing unit, and the coupling unit couples the signal at the control end of the leakage control module according to the voltage jump at the data voltage terminal;

[0044] By setting the voltage jump amount at the data voltage terminal, the gray level to be displayed is controlled; wherein, the voltage jump amount at the data voltage terminal is the difference between the first data voltage and the second data voltage.

[0045] Optionally, the driving method of the pixel circuit further includes:

[0046] Combined with the voltage jump amount at the data voltage terminal, the duration of the conduction level signal of the light emitting control signal is set to control the gray level to be displayed;

[0047] Preferably, the driving method of the pixel circuit further includes:

[0048] Combined with the voltage jump amount at the data voltage terminal, the first initialization signal accessed at the first initialization signal terminal is set to control the gray level to be displayed.

[0049] In the power supply voltage compensation stage of the pixel circuit, the driving method and the display panel provided by the embodiments of the present invention write the power supply voltage into the gate of the driving transistor and the control end of the leakage control module, and compensate the threshold voltage of the driving transistor through the compensation module, which helps to avoid the influence of the voltage drop of the power supply signal and the threshold voltage shift of the transistor on the display effect, reduces the requirements of the pixel circuit for the characteristics and processes of the driving transistor, and optimizes the display effect. In the light emitting stage, the data writing module controls the leakage control module by using the data voltage, so as to control the leakage of the gate voltage of the driving transistor through the leakage control module, thereby controlling the display brightness of the light emitting device, which helps to improve the flexibility of the gray level control of the display panel. Description of the Drawings

[0050] Figure 1 is a schematic structural diagram of a pixel circuit provided by an embodiment of the present invention;

[0051] Figure 2It is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0052] Figure 3 It is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention;

[0053] Figure 4 It is a schematic diagram of the driving timing of a pixel circuit provided by an embodiment of the present invention;

[0054] Figure 5 It is a schematic flow diagram of a driving method for a pixel circuit provided by an embodiment of the present invention. Detailed implementation manners

[0055] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that, for the sake of description, only parts related to the present invention rather than all structures are shown in the accompanying drawings.

[0056] As described in the background art, there are problems with poor display effects in existing display panels, which affect the performance of the display panels. After research by the inventor, it is found that the reasons for the above problems are as follows: The display device includes a display panel and a power supply line. The display panel receives a power signal through the power supply line and transmits the power signal to each row of pixel circuits. Due to the resistance of the power supply line, different degrees of voltage drops will occur at different positions of the power supply line for the power signal, resulting in different magnitudes of the power signals received by the pixel circuits in different regions of the display panel, causing differences in the display brightness of different regions of the display panel, thereby affecting the display effect. In addition, the pixel circuit generates a driving current through a driving transistor to drive the light-emitting device to emit light. The magnitude of this driving current is affected by the characteristics of the driving transistor itself. For example, the driving transistor has a threshold voltage. When the threshold voltage shifts, it will affect the magnitude of the driving current. Therefore, the characteristic differences between different driving transistors will cause uneven driving currents of the driving transistors, thereby affecting the display effect.

[0057] In view of the above problems, an embodiment of the present invention provides a pixel circuit. Figure 1 It is a schematic structural diagram of a pixel circuit provided by an embodiment of the present invention. As Figure 1 shown, the pixel circuit includes: a driving transistor DT, a compensation module 10, a leakage control module 20, a data writing module 30, a storage module 40, and a light-emitting control module 50.

[0058] The driving transistor DT is used to generate a driving current in response to a signal at its gate to drive the light-emitting device D1 to emit light.

[0059] The compensation module 10 is connected between the gate and the second pole of the driving transistor DT, and is used to compensate the threshold voltage of the driving transistor DT.

[0060] The leakage current control module 20 is connected between the gate of the driving transistor DT and the first initialization signal terminal, and is used to initialize the gate voltage of the driving transistor DT in response to the signal at its control terminal, and to control the leakage current between the gate of the driving transistor DT and the first initialization signal terminal.

[0061] The data writing module 30 is connected to the power supply voltage terminal, the data voltage terminal, and the control terminal of the leakage current control module 20, and is used to control the signal at the control terminal of the leakage current control module 20 according to the signal at the data voltage terminal in response to the signal at its control terminal.

[0062] The storage module 40 is connected to the power supply voltage terminal, the gate of the driving transistor DT, and the control terminal of the leakage current control module 20, and is used to store the voltages at the gate of the driving transistor DT and the control terminal of the leakage current control module 20 respectively.

[0063] The light emission control module 50 is connected between the second pole of the driving transistor DT and the light emitting device D1, and is used to turn on or off the driving transistor DT and the light emitting device D1 in response to the light emission control signal EM.

[0064] Among them, the gate of the driving transistor DT is connected to the first node N1, the control terminal of the leakage current control module 20 is connected to the second node N2, the data voltage terminal accesses the data voltage Vdata, the first initialization signal terminal accesses the first initialization signal Vref, the power supply voltage terminal accesses the first power supply voltage VDD, and the control terminal of the light emission control module 50 accesses the light emission control signal EM.

[0065] The first pole of the light emitting device D1 is connected to the light emission control module 50, and the second pole accesses the second power supply voltage VSS. The light emitting device D1 can be a light emitting diode (LED), an organic light-emitting diode (OLED), a micro light emitting diode (Micro LED), etc. The driving transistor DT can be either a P-type transistor or an N-type transistor. In the embodiments of the present invention, the driving transistor DT is taken as an example of a P-type transistor for illustration.

[0066] Specifically, taking Figure 1 the working stages of the pixel circuit shown as an example including an initialization stage, a power supply voltage compensation stage, a data voltage writing stage, and a light emission stage, the working principle thereof will be described.

[0067] In the initialization stage, the leakage control module 20 can be controlled to turn on in response to the signal at its control terminal, and the first initialization signal Vref is written to the gate of the driving transistor DT. When the driving transistor DT is a P-type transistor, the first initialization signal Vref can be a low-level signal to initialize the gate voltage of the driving transistor DT, which helps to clear the residual charge of the previous frame of the display image and avoid affecting the next frame of the display image. At the same time, the driving transistor DT can also turn on in response to the first initialization signal Vref.

[0068] In the power supply voltage compensation stage, the first power supply voltage VDD is written to the gate of the driving transistor DT and the control terminal of the leakage control module 20 to compensate the voltages of the gate of the driving transistor DT and the control terminal of the leakage control module 20 through the first power supply voltage VDD. And the storage module 40 stores the gate voltage of the driving transistor DT and the voltage of the control terminal of the leakage control module 20. At the same time, the compensation module 10 can be controlled to turn on, and the threshold voltage of the driving transistor DT is captured to the gate of the driving transistor DT through the compensation module 10. Exemplarily, in this stage, the voltage of the first node N1 is Vdd + Vth1, where Vdd is the voltage value of the first power supply voltage VDD, and Vth1 is the threshold voltage of the driving transistor DT. Optionally, when the leakage control module 20 includes a transistor connected between the gate of the driving transistor DT and the first initialization signal terminal and a transistor for compensating the threshold voltage of this transistor, the voltage of the second node N2 is Vdd + Vth1 + Vth2, and Vth2 is the threshold voltage of the transistor connected between the gate of the driving transistor DT and the first initialization signal terminal. According to the characteristics of the transistor, at this time, both the driving transistor DT and the transistor connected between the gate of the driving transistor DT and the first initialization signal terminal are in the off state, that is, both the driving transistor DT and the leakage control module 20 are off.

[0069] In the data voltage writing stage, the data writing module 30 can be controlled to turn on in response to the signal at its control terminal to control the signal of the second node N2 according to the data voltage Vdata, that is, to control the signal of the control terminal of the leakage control module 20. When the leakage control module 20 includes a transistor connected between the gate of the driving transistor DT and the first initialization signal terminal, this transistor can operate in the cut-off region in response to the signal of the control terminal of the leakage control module 20. And because there is a voltage difference between the first node N1 and the first initialization signal terminal, there is a leakage current between the gate of the driving transistor DT and the first initialization signal terminal, which reduces the voltage of the first node N1. The magnitude of the data voltage Vdata can determine the magnitude of the signal of the second node N2, thereby determining the magnitude of the leakage current between the gate of the driving transistor DT and the first initialization signal terminal, and determining the speed and degree of the voltage reduction of the first node N1.

[0070] During the light-emitting stage, the light-emitting control module 50 is controlled to turn on the driving transistor DT and the light-emitting device D1 in response to the light-emitting control signal EM. The first power supply voltage VDD is written to the first pole of the light-emitting device D1 through the driving transistor DT and the light-emitting control module 50, and the second power supply voltage VSS is written to the second pole of the light-emitting device D1. The driving transistor DT generates a driving current according to the signal of its gate, that is, generates a driving current according to the voltage of the first node N1, so as to drive the light-emitting device D1 to emit light and display with corresponding brightness. At the same time, the leakage control module 20 can control the leakage current between the gate of the driving transistor DT and the first initialization signal terminal in response to the signal of the second node N2, so as to control the speed and degree of the voltage reduction of the first node N1, thereby controlling the brightness of the light-emitting device D1 and realizing the gray-scale control of the display panel.

[0071] Among them, the leakage current between the gate of the driving transistor DT and the first initialization signal terminal is related to the magnitude of the data voltage Vdata. Therefore, the voltage change amount of the first node N1 is related to the magnitude of the data voltage Vdata. Exemplarily, during the light-emitting stage, the gate voltage of the driving transistor DT is Vdd + Vth1 + V0, and the source voltage (for example, the first pole of the driving transistor DT is the source) is Vdd, where Vdd is the voltage value of the first power supply voltage VDD, Vth1 is the threshold voltage of the driving transistor DT, V0 is the voltage change amount of the first node N1, and V0 is related to the magnitude of the data voltage Vdata. Correspondingly, the driving current I generated by the driving transistor DT ds can be expressed as:

[0072]

[0073] Among them, W is the channel width of the transistor, L is the channel length of the transistor, μ is the electron mobility of the transistor, C OX is the channel capacitance per unit area of the transistor, V gs is the difference between the gate voltage and the source voltage of the transistor.

[0074] According to the above expression of the driving current I ds it can be seen that the driving current I generated by the driving transistor DT ds is independent of both the first power supply voltage VDD and the threshold voltage of the driving transistor DT. Therefore, this solution helps to avoid the influence of the voltage drop of the power supply signal and the threshold voltage shift of the transistor on the display effect in the prior art, thereby optimizing the display effect and reducing the requirements for the characteristics and processes of the driving transistor of the pixel circuit. The above expression of the driving current I ds further verifies the driving current I dsThe magnitude is related to the degree of voltage reduction of the first node N1. Therefore, in this solution, the leakage current control module 20 can be used to control the gate voltage of the driving transistor DT to generate leakage current, thereby controlling the brightness of the light-emitting device, which helps to improve the flexibility of grayscale control.

[0075] In summary, for the pixel circuit provided by the embodiment of the present invention, during the power supply voltage compensation stage, the power supply voltage is written into the gate of the driving transistor and the control terminal of the leakage current control module. The threshold voltage of the driving transistor is compensated by the compensation module, which helps to avoid the influence of the voltage drop of the power supply signal and the threshold voltage shift of the transistor on the display effect, thereby reducing the requirements for the characteristics and process of the driving transistor in the pixel circuit and optimizing the display effect. During the light-emitting stage, the data writing module controls the leakage current control module by using the data voltage, so as to control the gate voltage of the driving transistor through the leakage current control module to generate leakage current, thereby controlling the display brightness of the light-emitting device, which helps to improve the flexibility of grayscale control of the display panel.

[0076] Figure 2 is a schematic structural diagram of another pixel circuit provided by the embodiment of the present invention. As Figure 2 shown, optionally, based on the above embodiment, it is set that the data writing module includes a data writing unit 31 and a coupling unit 32; the control terminal of the data writing unit 31 serves as the control terminal of the data writing module, the first terminal of the data writing unit 31 is connected to the data voltage terminal, and the second terminal of the data writing unit 31 is connected to the first terminal of the coupling unit 32, and is used to write the signal of the data voltage terminal into the first terminal of the coupling unit 32 in response to the signal of its control terminal; the second terminal of the coupling unit 32 is connected to the control terminal of the leakage current control module 20, and is used to couple the signal of the control terminal of the leakage current control module 20 according to the voltage jump of the data voltage terminal.

[0077] Exemplarily, during the initialization stage and the power supply voltage compensation stage of the pixel circuit operation, a first data voltage is applied to the data voltage terminal, and the data writing unit 31 is controlled to conduct in response to the signal of its control terminal, so as to write the first data voltage into the first terminal of the coupling unit 32 through the conducting data writing unit 31, and initialize the voltage of the first terminal of the coupling unit 32 by using the first data voltage.

[0078] During the data voltage writing stage, a second data voltage is applied to the data voltage terminal, and the data writing unit 31 is controlled to conduct in response to the signal of its control terminal, so as to write the second data voltage into the first terminal of the coupling unit 32 through the conducting data writing unit 31, so that the coupling unit 32 couples the signal of the control terminal of the leakage current control module 20 according to the voltage jump of the data voltage terminal.

[0079] Continue to refer to Figure 2, optionally, based on the above embodiments, the data writing module further includes a storage unit 33 connected between the power supply voltage terminal and the first end of the coupling unit 32 for storing the voltage at the first end of the coupling unit 32. The advantage of this setting is that it helps to maintain the stability of the voltage at the first end of the coupling unit 32.

[0080] Optionally, by setting the voltage jump amount of the data voltage terminal, the gray scale to be displayed is controlled; wherein, the voltage jump amount of the data voltage terminal is the difference between the first data voltage and the second data voltage. Exemplarily, taking the first data voltage being greater than the second data voltage as an example, during the data voltage writing stage, when the voltage of the data voltage terminal jumps from the first data voltage to the second data voltage, due to the coupling effect of the coupling unit 32, the potential of the second node N2 can be pulled down according to the voltage jump of the data voltage terminal, thereby changing the voltage at the control end of the leakage control module 20. When the leakage control module 20 includes a transistor connected between the gate of the driving transistor DT and the first initialization signal terminal, and the gate of this transistor is connected to the second node N2, this transistor can respond to the voltage of the second node N2 to conduct leakage. By setting the difference between the first data voltage and the second data voltage, the voltage jump amount of the data voltage terminal can be set to control the voltage of the second node N2, thereby controlling the leakage current between the gate of the driving transistor DT and the first initialization signal terminal to control the brightness of the light-emitting device and achieve gray scale control of the display panel.

[0081] Continue to refer to Figure 2 , optionally, the pixel circuit may further include an initialization module 60 connected between the second initialization signal terminal and the control end of the leakage control module 20 for initializing the voltage at the control end of the leakage control module 20. Wherein, the second initialization signal terminal receives the second initialization signal Vinit. Specifically, during the initialization stage, the initialization module 60 can be controlled to conduct, and the second initialization signal Vinit is written into the control end of the leakage control module 20 to initialize the signal at the control end of the leakage control module 20 through the second initialization signal Vinit. Since the signal at the control end of the leakage control module 20 is related to the display brightness of the light-emitting device D1, therefore, by initializing the signal at the control end of the leakage control module 20, it helps to clear the residual charge of the previous frame of the display screen and avoid affecting the next frame of the display screen. At the same time, the leakage control module 20 can also conduct in response to the second initialization signal Vinit and write the first initialization signal Vref into the gate of the driving transistor DT to initialize the gate voltage of the driving transistor DT.

[0082] Figure 3It is a schematic structural diagram of another pixel circuit provided by an embodiment of the present invention. Optionally, the specific structures of each module and unit in the pixel circuit can be various, and the transistors in each module and unit can be either P-type transistors or N-type transistors. Figure 3 It schematically shows the case where the transistors in the pixel circuit are all P-type transistors. The following will describe the specific structures of each module and unit in the pixel circuit in conjunction with Figure 2 and Figure 3 .

[0083] Optionally, the data writing unit 31 includes a first transistor T1, and the coupling unit 32 includes a first capacitor C1. The gate of the first transistor T1 serves as the control end of the data writing unit 31 and is connected to the first scan signal terminal. The first pole of the first transistor T1 is connected to the data voltage terminal, the second pole of the first transistor T1 is connected to the first electrode of the first capacitor C1, and the second electrode of the first capacitor C1 is connected to the control end of the leakage control module 20. Among them, the first scan signal terminal receives the first scan signal Scan1. The first capacitor C1 has a coupling effect and can couple the potential of its second electrode according to the jump amount of the data voltage applied to its first electrode, thereby controlling the signal at the control end of the leakage control module 20.

[0084] Optionally, the storage unit 33 includes a second capacitor C2. The second capacitor C2 is connected between the power supply voltage terminal and the first electrode of the first capacitor C1, and the second capacitor C2 is used to store the voltage of the first electrode of the first capacitor C1 to maintain the stability of the voltage of the first electrode.

[0085] Optionally, the leakage control module 20 includes a second transistor T2 and a third transistor T3. The gate of the second transistor T2 serves as the control end of the leakage control module 20. The first pole of the second transistor T2 is connected to the first initialization signal terminal, and the second pole of the second transistor T2 is connected to the gate of the driving transistor DT. The gate of the third transistor T3 is connected to the second scan signal terminal. The first pole of the third transistor T3 is connected to the first pole of the second transistor T2, and the second pole of the third transistor T3 is connected to the gate of the second transistor T2. Among them, the second scan signal terminal receives the second scan signal Scan2. When the third transistor T3 is turned on, it can capture the threshold voltage of the second transistor T2 to the gate of the second transistor T2 to compensate for the threshold voltage of the second transistor T2.

[0086] Optionally, the initialization module 60 includes a fourth transistor T4. The gate of the fourth transistor T4 is connected to the third scan signal terminal, the first pole of the fourth transistor T4 is connected to the second initialization signal terminal, and the second pole of the fourth transistor T4 is connected to the control terminal of the leakage control module 20. Among them, the third scan signal Scan3 is applied to the third scan signal terminal. When the fourth transistor T4 is turned on, the second initialization signal Vinit can be written into the control terminal of the leakage control module 20, the signal of the control terminal of the leakage control module 20 is initialized through the second initialization signal Vinit, and the leakage control module 20 is controlled to be turned on.

[0087] Optionally, the storage module 40 includes a third capacitor C3 and a fourth capacitor C4. The third capacitor C3 is connected between the power supply voltage terminal and the control terminal of the leakage control module 20 for storing the voltage of the control terminal of the leakage control module 20; the fourth capacitor C4 is connected between the power supply voltage terminal and the gate of the driving transistor DT for storing the voltage of the gate of the driving transistor DT.

[0088] Optionally, the compensation module 10 includes a fifth transistor T5. The gate of the fifth transistor T5 is connected to the second scan signal terminal, the first pole of the fifth transistor T5 is connected to the second pole of the driving transistor DT, and the second pole of the fifth transistor T5 is connected to the gate of the driving transistor DT. Among them, the second scan signal Scan2 is applied to the second scan signal terminal. When the fifth transistor T5 is turned on, the threshold voltage of the driving transistor DT can be captured to the gate of the driving transistor DT, thereby compensating the threshold voltage of the driving transistor DT.

[0089] Optionally, the light emission control module 50 includes a sixth transistor T6. The gate of the sixth transistor T6 is connected to the light emission control signal terminal, the first pole of the sixth transistor T6 is connected to the second pole of the driving transistor DT, and the second pole of the sixth transistor T6 is connected to the first pole of the light emitting device D1. The sixth transistor T6 can turn on or off the driving transistor DT and the light emitting device D1 in response to the light emission control signal EM.

[0090] Optionally, the pixel circuit may further include a seventh transistor T7. The gate of the seventh transistor T7 is connected to the fourth scan signal terminal, the first pole of the seventh transistor T7 is connected to the power supply voltage terminal, and the second pole of the seventh transistor T7 is connected to the first pole of the driving transistor DT. Among them, the fourth scan signal Scan4 is applied to the fourth scan signal terminal. The seventh transistor T7 can turn on or off the power supply voltage terminal and the driving transistor DT in response to the fourth scan signal Scan4 to control the light emission stage of the pixel circuit.

[0091] Figure 4 It is a schematic diagram of the driving timing of a pixel circuit provided by an embodiment of the present invention. Figure 4 The shown driving timing schematic diagram can be used to driveFigure 3 The pixel circuit shown operates. The following combines Figure 3 and Figure 4 , and describes the working principle of the pixel circuit provided by the embodiments of the present invention. Exemplarily, the working phases of the pixel circuit include: an initialization phase t1, a power supply voltage compensation phase t2, a data voltage writing phase t3, and a light emitting phase t4.

[0092] In the initialization phase t1, the first scan signal Scan1 and the third scan signal Scan3 are low-level signals, the second scan signal Scan2, the fourth scan signal Scan4, and the light emission control signal EM are all high-level signals, and the voltage value of the data voltage Vdata is the first data voltage. The fourth transistor T4 is turned on, and the second initialization signal Vinit is written into the second node N2 to initialize the gate voltage of the second transistor T2 and turn on the second transistor T2. The first initialization signal Vref is written into the first node N1 through the second transistor T2 to initialize the gate voltage of the driving transistor DT and turn on the driving transistor DT. The first transistor T1 is turned on, and the first data voltage is written into the first electrode of the first capacitor C1 to initialize the voltage of the first electrode of the first capacitor C1.

[0093] In the power supply voltage compensation phase t2, the first scan signal Scan1, the second scan signal Scan2, and the fourth scan signal Scan4 are all low-level signals, the third scan signal Scan3 and the light emission control signal EM are high-level signals, and the voltage value of the data voltage Vdata remains the first data voltage. The third transistor T3, the fifth transistor T5, and the seventh transistor T7 are all turned on. The first power supply voltage VDD is written into the gates of the second transistor T2 and the driving transistor DT respectively. The voltage of the first node N1 is Vdd + Vth1, and the voltage of the second node N2 is Vdd + Vth1 + Vth2, where Vdd is the voltage value of the first power supply voltage VDD, Vth1 is the threshold voltage of the driving transistor DT, and Vth2 is the threshold voltage of the second transistor T2. The second transistor T2 and the driving transistor DT are both turned off, and since the gate of the second transistor T2 is connected to the second node N2 and the voltage value of the second node N2 is less than the voltage value of the first node N1, the second transistor T2 will turn off before the driving transistor DT. The voltage of the first electrode of the first capacitor C1 remains the first data voltage.

[0094] In the data voltage writing phase t3, the first scan signal Scan1 is a low-level signal, the second scan signal Scan2, the third scan signal Scan3, the fourth scan signal Scan4, and the light emission control signal EM are all high-level signals, and the data voltage Vdata jumps from the first data voltage to the second data voltage. Figure 4Schematically shows a situation where the second data voltage in the data voltage writing stage t3 is less than the first data voltage in the initialization stage t1 and the power supply voltage compensation stage t2. In practical applications, the jump amount of the data voltage Vdata in the data voltage writing stage t3 can be set according to the gray scale to be displayed, and this embodiment does not limit this. When the second data voltage is less than the first data voltage, due to the coupling effect of the first capacitor C1, the voltage of the second node N2 can be pulled down according to the jump of the data voltage at its first electrode, causing the second transistor T2 to generate a leakage current, that is, there is a leakage current between the first node N1 and the first initialization signal terminal, and the magnitude of the leakage current of the second transistor T2 can be controlled by the voltage of the second node N2. Therefore, the voltage jump amount at the data voltage terminal can determine the leakage current of the second transistor T2, thereby determining the speed and degree of the voltage reduction of the first node N1.

[0095] In the light emitting stage t4, the fourth scan signal Scan4 is a low level signal, and the first scan signal Scan1, the second scan signal Scan2, and the third scan signal Scan3 are all high level signals, and the seventh transistor T7 is turned on. When the light emitting control signal EM is a low level signal, the sixth transistor T6 is turned on, the first power supply voltage VDD is written to the first pole of the light emitting device D1 through the seventh transistor T7, the driving transistor DT, and the sixth transistor T6, and the second power supply voltage VSS is written to the second pole of the light emitting device D1. The driving transistor DT generates a driving current according to the voltage of the first node N1, and drives the light emitting device D1 to emit light and display with a corresponding brightness. The brightness of the light emitting device D1 is determined by the voltage change amount of the first node N1, that is Figure 4 The difference between the voltage of the first node N1 and the horizontal dotted line in the shown light emitting stage t4 determines the brightness of the light emitting device D1.

[0096] Optionally, in this embodiment, the driving current generated by the driving transistor DT is positively correlated with the voltage jump amount at the data voltage terminal. Exemplarily, in the light emitting stage t4, the gate voltage of the second transistor T2 is Vdd + Vth1 + Vth2 + ΔV, and the source voltage (for example, the electrode where the second transistor T2 is connected to the first node N1 is the source electrode) is Vdd + Vth1, where Vdd is the voltage value of the first power supply voltage VDD, Vth1 is the threshold voltage of the driving transistor DT, Vth2 is the threshold voltage of the second transistor T2, ΔV is the voltage change amount of the second node N2, and the magnitude of ΔV is directly determined by the voltage jump amount of the data voltage Vdata. Accordingly, the current (i.e., leakage current) I of the second transistor T2 ds2 can be expressed as:

[0097]

[0098] The gate voltage of the driving transistor DT (i.e., the voltage of the first node N1) is Vdd + Vth1 + V(t), and the source voltage is Vdd, where V(t) represents the change in the gate voltage of the driving transistor DT, that is, the change in the voltage of the first node N1. Combining with Figure 4 the voltage waveform of the first node N1 in the indicated light-emitting stage t4, it can be seen that the magnitude of V(t) is related to both time and the voltage reduction rate of the first node N1. The magnitude of V(t) is directly determined by the leakage current I of the second transistor T2 ds2 and V(t) is positively correlated with the leakage current I of the second transistor T2. Correspondingly, the driving current I generated by the driving transistor DT ds2 can be expressed as: ds

[0099]

[0100] where W is the channel width of the transistor, L is the channel length of the transistor, μ is the electron mobility of the transistor, and C OX is the channel capacitance per unit area of the transistor.

[0101] In summary, the driving current generated by the driving transistor DT is positively correlated with the leakage current of the second transistor T2. The leakage current of the second transistor T2 is determined by the voltage jump of the data voltage Vdata. Therefore, by controlling the voltage jump of the data voltage Vdata, the leakage current of the second transistor T2 can be controlled to control the speed and degree of the voltage reduction of the first node N1, thereby controlling the driving current generated by the driving transistor DT, and realizing the brightness control of the light-emitting device and the gray-scale control of the display panel. Moreover, the driving current generated by the driving transistor DT is not related to the first power supply voltage VDD and the threshold voltage of the driving transistor DT, which helps to avoid the influence of the voltage drop of the power supply signal and the threshold voltage shift of the transistor on the display effect, thereby reducing the requirements for the characteristics and processes of the driving transistor of the pixel circuit and optimizing the display effect.

[0102] Based on the above embodiments, optionally, in combination with the voltage jump of the data voltage terminal, the duration of the conduction level signal of the light-emitting control signal is set to control the gray scale to be displayed. Exemplarily, combining Figure 3 and Figure 4 ​, during the light-emitting stage t4, the voltage jump amount of the data voltage Vdata and the duration of the low-level signal of the light-emitting control signal EM can be set according to the target gray level to be displayed. For example, the duration and number of low-level signals of the light-emitting control signal EM in the light-emitting stage t4 can be set to control the brightness of the light-emitting device by controlling the duration of the low-level signal of the light-emitting control signal EM. The technical solution of this embodiment not only controls the gray level to be displayed through the voltage jump amount of the data voltage terminal to achieve the analog drive of the pixel circuit. On this basis, it can also cooperate with the digital debugging method of the light-emitting control signal to further control the gray level to be displayed to achieve the digital drive of the pixel circuit, so that this solution realizes the digital-analog hybrid drive of the pixel circuit, which helps to improve the flexibility of gray level control and enhance the display effect.

[0103] Based on the above embodiments, optionally, the first initialization signal Vref connected to the first initialization signal terminal can also be set in combination with the voltage jump amount of the data voltage terminal to control the gray level to be displayed. Exemplarily, refer to Figure 3 , the magnitude of the leakage current of the second transistor T2 is also related to the voltage difference between the first node N1 and the first initialization signal terminal. When the first initialization signal Vref is closer to the voltage of the first node N1, the voltage difference between the first node N1 and the first initialization signal terminal is smaller, the leakage current of the second transistor T2 is relatively smaller, the voltage reduction speed of the first node N1 is slower, the voltage reduction degree of the first node N1 per unit time is smaller, and the voltage change amount of the first node N1 is also smaller. Similarly, the larger the voltage difference between the voltage of the first node N1 and the first initialization signal Vref, the relatively larger the leakage current of the second transistor T2, the faster the voltage reduction speed of the first node N1, the larger the voltage reduction degree of the first node N1 per unit time, and the larger the voltage change amount of the first node N1. Therefore, the voltage jump amount of the data voltage terminal and the first initialization signal Vref can jointly determine the leakage current of the second transistor T2, thereby determining the speed and degree of voltage reduction of the first node N1. By setting the voltage jump amount of the data voltage terminal and the first initialization signal Vref, the gray level control of the display panel can be achieved.

[0104] The embodiment of the present invention also provides a display panel, which can be a light-emitting diode (LED) display panel, an organic light-emitting diode (OLED) display panel, a micro light-emitting diode (Micro LED) display panel, etc. The display panel provided by the embodiment of the present invention includes the pixel circuit provided by any embodiment of the present invention, and its technical principle and the effects produced are similar and will not be elaborated here.

[0105] The embodiment of the present invention also provides a driving method for a pixel circuit, which is applicable to the pixel circuit provided by any embodiment of the present invention.Figure 5 It is a schematic flow chart of a driving method for a pixel circuit provided by an embodiment of the present invention. Specifically, the working stages of the pixel circuit include an initialization stage, a power supply voltage compensation stage, a data voltage writing stage, and a light emitting stage; correspondingly, as Figure 5 shown, the driving method of the pixel circuit includes:

[0106] S110. In the initialization stage, the gate voltage of the driving transistor is initialized by the leakage control module in response to the signal at its control terminal.

[0107] Referring to Figure 1 , in the initialization stage, the leakage control module 20 can be controlled to conduct in response to the signal at its control terminal, and the first initialization signal Vref is written into the gate of the driving transistor DT. When the driving transistor DT is a P-type transistor, the first initialization signal Vref can be a low-level signal to initialize the gate voltage of the driving transistor DT through the first initialization signal Vref, which helps to clear the residual charge of the previous frame display image and avoid affecting the next frame display image. At the same time, the driving transistor DT can also conduct in response to the first initialization signal Vref.

[0108] S120. In the power supply voltage compensation stage, the voltages of the control terminal of the leakage control module and the gate of the driving transistor are compensated by the power supply voltage connected to the power supply voltage terminal.

[0109] Continuing to refer to Figure 1 , in the power supply voltage compensation stage, the first power supply voltage VDD is written into the gate of the driving transistor DT and the control terminal of the leakage control module 20 to compensate the voltages of the gate of the driving transistor DT and the control terminal of the leakage control module 20 through the first power supply voltage VDD, and the storage module 40 stores the gate voltage of the driving transistor DT and the voltage of the control terminal of the leakage control module 20. At the same time, the compensation module 10 can be controlled to conduct, and the threshold voltage of the driving transistor DT is captured to the gate of the driving transistor DT through the compensation module 10. Exemplarily, in this stage, the voltage of the first node N1 is Vdd + Vth1, where Vdd is the voltage value of the first power supply voltage VDD, and Vth1 is the threshold voltage of the driving transistor DT. Optionally, when the leakage control module 20 includes a transistor connected between the gate of the driving transistor DT and the first initialization signal terminal and a transistor for compensating the threshold voltage of this transistor, the voltage of the second node N2 is Vdd + Vth1 + Vth2, and Vth2 is the threshold voltage of the transistor connected between the gate of the driving transistor DT and the first initialization signal terminal. According to the characteristics of the transistor, at this time, both the driving transistor DT and the transistor connected between the gate of the driving transistor DT and the first initialization signal terminal are in the off state, that is, both the driving transistor DT and the leakage control module 20 are off.

[0110] S130. During the data voltage writing stage, the data writing module controls the signal of the control terminal of the leakage control module according to the signal of the data voltage terminal in response to the signal of its control terminal.

[0111] Continue to refer to Figure 1 , during the data voltage writing stage, the data writing module 30 can be turned on in response to the signal of its control terminal to control the signal of the second node N2 according to the data voltage Vdata, that is, to control the signal of the control terminal of the leakage control module 20. When the leakage control module 20 includes a transistor connected between the gate of the driving transistor DT and the first initialization signal terminal, the transistor can operate in the cut-off region in response to the signal of the control terminal of the leakage control module 20, and since there is a voltage difference between the first node N1 and the first initialization signal terminal, there is a leakage current between the gate of the driving transistor DT and the first initialization signal terminal, causing the voltage of the first node N1 to decrease. The magnitude of the data voltage Vdata can determine the magnitude of the signal of the second node N2, thereby determining the magnitude of the leakage current between the gate of the driving transistor DT and the first initialization signal terminal, and determining the speed and degree of the voltage reduction of the first node N1.

[0112] S140. During the light emitting stage, the light emitting control module is turned on in response to the light emitting control signal to drive the driving transistor and the light emitting device, and the leakage control module controls the leakage current between the gate of the driving transistor and the first initialization signal terminal in response to the signal of its control terminal, so as to generate a driving current through the driving transistor in response to the signal of its gate to drive the light emitting device to emit light.

[0113] Continue to refer to Figure 1 , during the light emitting stage, control the light emitting control module 50 to be turned on in response to the light emitting control signal EM to drive the driving transistor DT and the light emitting device D1. The first power supply voltage VDD is written to the first pole of the light emitting device D1 through the driving transistor DT and the light emitting control module 50, and the second power supply voltage VSS is written to the second pole of the light emitting device D1. The driving transistor DT generates a driving current according to the signal of its gate, that is, generates a driving current according to the voltage of the first node N1, so as to drive the light emitting device D1 to emit light and display with corresponding brightness. At the same time, the leakage control module 20 can control the leakage current between the gate of the driving transistor DT and the first initialization signal terminal in response to the signal of the second node N2 to control the speed and degree of the voltage reduction of the first node N1, thereby controlling the brightness of the light emitting device D1 and realizing the gray scale control of the display panel.

[0114] The driving method of the pixel circuit provided by the embodiment of the present invention, in the power supply voltage compensation stage, writes the power supply voltage to the gate of the driving transistor and the control end of the leakage control module, and compensates the threshold voltage of the driving transistor through the compensation module, which helps to avoid the influence of the voltage drop of the power supply signal and the threshold voltage shift of the transistor on the display effect, thereby reducing the requirements of the pixel circuit for the characteristics and process of the driving transistor and optimizing the display effect. In the light-emitting stage, the data writing module controls the leakage control module by using the data voltage, so as to control the leakage of the gate voltage of the driving transistor through the leakage control module, thereby controlling the display brightness of the light-emitting device, which helps to improve the flexibility of gray-scale control of the display panel.

[0115] On the basis of the above embodiment, optionally, the driving method of the pixel circuit further includes:

[0116] In the initialization stage and the power supply voltage compensation stage, apply a first data voltage to the data voltage terminal, so as to write the first data voltage to the first end of the coupling unit through the data writing unit, and initialize the voltage of the first end of the coupling unit;

[0117] In the data voltage writing stage, apply a second data voltage to the data voltage terminal, so as to write the second data voltage to the first end of the coupling unit through the data writing unit, and enable the coupling unit to couple the signal at the control end of the leakage control module according to the voltage jump of the data voltage terminal;

[0118] Control the gray scale to be displayed by setting the voltage jump amount of the data voltage terminal; wherein, the voltage jump amount of the data voltage terminal is the difference between the first data voltage and the second data voltage.

[0119] See Figure 2 , for example, in the initialization stage and the power supply voltage compensation stage of the pixel circuit operation, apply a first data voltage to the data voltage terminal, and control the data writing unit 31 to conduct in response to the signal at its control end, so as to write the first data voltage to the first end of the coupling unit 32 through the conducting data writing unit 31, and initialize the voltage of the first end of the coupling unit 32 by using the first data voltage. In the data voltage writing stage, apply a second data voltage to the data voltage terminal, and control the data writing unit 31 to conduct in response to the signal at its control end, so as to write the second data voltage to the first end of the coupling unit 32 through the conducting data writing unit 31, and enable the coupling unit 32 to couple the signal at the control end of the leakage control module 20 according to the voltage jump of the data voltage terminal. By setting the difference between the first data voltage and the second data voltage, the voltage jump amount of the data voltage terminal can be set to control the voltage of the second node N2, so as to control the brightness of the light-emitting device by controlling the leakage current between the gate of the driving transistor DT and the first initialization signal terminal, and realize the gray-scale control of the display panel.

[0120] Based on the above embodiments, optionally, the driving method of the pixel circuit further includes: combining the voltage jump amount of the data voltage terminal to set the duration of the conduction level signal of the light-emitting control signal, so as to control the gray level to be displayed. The technical solution of this embodiment not only controls the gray level to be displayed through the voltage jump amount of the data voltage terminal to achieve the analog driving of the pixel circuit. On this basis, it can also further control the gray level to be displayed in cooperation with the digital debugging method of the light-emitting control signal to achieve the digital driving of the pixel circuit, so that this solution realizes the digital-analog hybrid driving of the pixel circuit, which helps to improve the flexibility of gray level control and the display effect.

[0121] Optionally, the driving method of the pixel circuit further includes: combining the voltage jump amount of the data voltage terminal to set the first initialization signal applied to the first initialization signal terminal, so as to control the gray level to be displayed. Exemplarily, referring to Figure 3 , the magnitude of the leakage current of the second transistor T2 is also related to the voltage difference between the first node N1 and the first initialization signal terminal. The voltage jump amount of the data voltage terminal and the first initialization signal Vref can jointly determine the leakage current of the second transistor T2, thereby determining the speed and degree of the voltage reduction of the first node N1. By setting the voltage jump amount of the data voltage terminal and the first initialization signal Vref, the gray level control of the display panel can be achieved.

[0122] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it can also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A pixel circuit, characterized in that, Comprising: A driving transistor for generating a driving current in response to a signal at its gate to drive a light-emitting device to emit light; A compensation module connected between the gate and the second pole of the driving transistor for compensating the threshold voltage of the driving transistor; A leakage current control module connected between the gate of the driving transistor and a first initialization signal terminal for initializing the gate voltage of the driving transistor in response to a signal at its control terminal and controlling the leakage current between the gate of the driving transistor and the first initialization signal terminal; A data writing module connected to a power supply voltage terminal, a data voltage terminal, and the control terminal of the leakage current control module for controlling the signal at the control terminal of the leakage current control module according to the signal at the data voltage terminal in response to a signal at its control terminal; A storage module connected to the power supply voltage terminal, the gate of the driving transistor, and the control terminal of the leakage current control module for storing the voltages at the gate of the driving transistor and the control terminal of the leakage current control module respectively; A light emission control module connected between the second pole of the driving transistor and the light-emitting device for turning on or off the driving transistor and the light-emitting device in response to a light emission control signal; The leakage current control module includes a second transistor and a third transistor; The gate of the second transistor serves as the control terminal of the leakage current control module, the first pole of the second transistor is connected to the first initialization signal terminal, and the second pole of the second transistor is connected to the gate of the driving transistor; The gate of the third transistor is connected to a second scan signal terminal, the first pole of the third transistor is connected to the first pole of the second transistor, and the second pole of the third transistor is connected to the gate of the second transistor; The driving current generated by the driving transistor is positively correlated with the voltage jump amount at the data voltage terminal; The current of the second transistor is expressed as: The driving current generated by the driving transistor is expressed as: Among them, I ds2 is the current of the second transistor, I ds is the driving current generated by the driving transistor, W is the channel width of the transistor, L is the channel length of the transistor, μ is the electron mobility of the transistor, C OX is the channel capacitance per unit area of the transistor, ΔV is the voltage jump of the data voltage terminal, V(t) is the change in the gate voltage of the driving transistor, and V(t) is positively correlated with I ds2 shows a positive correlation.

2. The pixel circuit according to claim 1, wherein The data writing module includes a data writing unit and a coupling unit; The control terminal of the data writing unit serves as the control terminal of the data writing module, the first end of the data writing unit is connected to the data voltage terminal, and the second end of the data writing unit is connected to the first end of the coupling unit for writing the signal at the data voltage terminal into the first end of the coupling unit in response to a signal at its control terminal; The second end of the coupling unit is connected to the control terminal of the leakage current control module for coupling the signal at the control terminal of the leakage current control module according to the voltage jump at the data voltage terminal.

3. The pixel circuit according to claim 2, wherein The data writing unit includes a first transistor, and the coupling unit includes a first capacitor; the gate of the first transistor serves as the control terminal of the data writing unit, is connected to a first scan signal terminal, the first pole of the first transistor is connected to the data voltage terminal, the second pole of the first transistor is connected to the first electrode of the first capacitor, and the second electrode of the first capacitor is connected to the control terminal of the leakage current control module.

4. The pixel circuit according to claim 3, wherein The data writing module further includes a storage unit, which is connected between the power supply voltage terminal and the first end of the coupling unit, and is used for storing the voltage at the first end of the coupling unit.

5. The pixel circuit according to claim 4, wherein The storage unit includes a second capacitor, and the second capacitor is connected between the power supply voltage terminal and the first electrode of the first capacitor.

6. The pixel circuit according to claim 1, wherein It further includes: An initialization module, which is connected between the second initialization signal terminal and the control terminal of the leakage control module, and is used for initializing the voltage at the control terminal of the leakage control module.

7. The pixel circuit according to claim 6, wherein The initialization module includes a fourth transistor, the gate of the fourth transistor is connected to the third scan signal terminal, the first pole of the fourth transistor is connected to the second initialization signal terminal, and the second pole of the fourth transistor is connected to the control terminal of the leakage control module.

8. The pixel circuit according to claim 1, wherein The storage module includes a third capacitor and a fourth capacitor. The third capacitor is connected between the power supply voltage terminal and the control terminal of the leakage control module, and the fourth capacitor is connected between the power supply voltage terminal and the gate of the driving transistor; The compensation module includes a fifth transistor, the gate of the fifth transistor is connected to the second scan signal terminal, the first pole of the fifth transistor is connected to the second pole of the driving transistor, and the second pole of the fifth transistor is connected to the gate of the driving transistor; The light emission control module includes a sixth transistor, the gate of the sixth transistor is connected to the light emission control signal terminal, the first pole of the sixth transistor is connected to the second pole of the driving transistor, and the second pole of the sixth transistor is connected to the first pole of the light emitting device.

9. The pixel circuit according to claim 8, wherein It further includes a seventh transistor, the gate of the seventh transistor is connected to the fourth scan signal terminal, the first pole of the seventh transistor is connected to the power supply voltage terminal, and the second pole of the seventh transistor is connected to the first pole of the driving transistor.

10. A display panel, characterized in that, It includes the pixel circuit according to any one of claims 1-9.

11. A driving method for a pixel circuit, characterized in that The pixel circuit includes the pixel circuit according to any one of claims 1-9; The working phases of the pixel circuit include an initialization phase, a power supply voltage compensation phase, a data voltage writing phase, and a light emission phase; the driving method of the pixel circuit includes: In the initialization phase, the gate voltage of the driving transistor is initialized by the leakage control module in response to the signal at its control terminal; In the power supply voltage compensation phase, the voltages at the control terminal of the leakage control module and the gate of the driving transistor are compensated by the power supply voltage applied through the power supply voltage terminal; In the data voltage writing phase, the control signal at the control terminal of the leakage control module is controlled by the data writing module in response to the signal at its control terminal according to the signal at the data voltage terminal; During the light-emitting stage, the driving transistor and the light-emitting device are turned on by the light-emitting control module in response to a light-emitting control signal, and the leakage current between the gate of the driving transistor and the first initialization signal terminal is controlled by the leakage control module in response to the signal at its control terminal, so as to generate a driving current through the driving transistor in response to the signal at its gate to drive the light-emitting device to emit light.

12. The driving method of the pixel circuit according to claim 11, characterized in that, The data writing module includes a data writing unit and a coupling unit; the control terminal of the data writing unit serves as the control terminal of the data writing module, the first terminal of the data writing unit is connected to the data voltage terminal, and the second terminal of the data writing unit is connected to the first terminal of the coupling unit, and is configured to write the signal of the data voltage terminal into the first terminal of the coupling unit in response to the signal at its control terminal; the second terminal of the coupling unit is connected to the control terminal of the leakage control module, and is configured to couple the signal at the control terminal of the leakage control module according to the voltage jump of the data voltage terminal. The driving method of the pixel circuit further includes: During the initialization stage and the power supply voltage compensation stage, a first data voltage is applied to the data voltage terminal to write the first data voltage into the first terminal of the coupling unit through the data writing unit to initialize the voltage of the first terminal of the coupling unit. During the data voltage writing stage, a second data voltage is applied to the data voltage terminal to write the second data voltage into the first terminal of the coupling unit through the data writing unit, so that the coupling unit couples the signal at the control terminal of the leakage control module according to the voltage jump of the data voltage terminal. The gray level to be displayed is controlled by setting the voltage jump amount of the data voltage terminal; wherein, the voltage jump amount of the data voltage terminal is the difference between the first data voltage and the second data voltage.

13. The driving method of the pixel circuit according to claim 12, wherein It further includes: Combined with the voltage jump amount of the data voltage terminal, the duration of the conduction level signal of the light-emitting control signal is set to control the gray level to be displayed.

14. The driving method of the pixel circuit according to claim 13, wherein The driving method of the pixel circuit further includes: Combined with the voltage jump amount of the data voltage terminal, the first initialization signal applied to the first initialization signal terminal is set to control the gray level to be displayed.

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