Threshold adjustment circuit and method, pixel driving circuit and driving method thereof, and display panel

Abstract

The present invention discloses a threshold adjustment circuit and method, a pixel driving circuit and its driving method, and a display panel. The threshold adjustment circuit includes a first initialization module, a first dual-gate transistor, a first storage module, and a threshold adjustment module; the first initialization module is electrically connected to the top gate of the first dual-gate transistor, and the first initialization module is used to initialize the top gate of the first dual-gate transistor; the first end of the first storage module is electrically connected to the bottom gate of the first dual-gate transistor, and the first storage module is used to maintain the potential of the bottom gate of the first dual-gate transistor; the first end of the first dual-gate transistor is connected to a first power supply signal; the first end of the threshold adjustment module is connected to the second end of the first dual-gate transistor, and the second end of the threshold adjustment module is electrically connected to the bottom gate of the first dual-gate transistor, and the threshold adjustment module is used to control the potential of the bottom gate of the first dual-gate transistor to control the threshold voltage of the first dual-gate transistor. The technical solution of the present invention improves the display uniformity of the display panel.

Description

Technical Field

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

[0002] With the development of display technology, the application of display panels is becoming more and more extensive, and correspondingly, the requirements for display panels are becoming higher and higher.

[0003] The threshold voltages of driving transistors of existing display panels are non-uniform, which results in non-uniform driving currents and affects the display uniformity of the display panel. Summary of the Invention

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

[0005] In a first aspect, an embodiment of the present invention provides a threshold adjustment circuit, the threshold adjustment circuit comprising: a first initialization module, a first dual-gate transistor, a first storage module, and a threshold adjustment module;

[0006] The first initialization module is electrically connected to the top gate of the first dual-gate transistor, and the first initialization module is used to initialize the top gate of the first dual-gate transistor;

[0007] The first end of the first storage module is electrically connected to the bottom gate of the first dual-gate transistor, and the first storage module is used to maintain the potential of the bottom gate of the first dual-gate transistor;

[0008] The first terminal of the first dual-gate transistor is connected to a first power supply signal;

[0009] The first end of the threshold adjustment module is connected to the second end of the first dual-gate transistor, and the second end of the threshold adjustment module is electrically connected to the bottom gate of the first dual-gate transistor. The threshold adjustment module is used to control the potential of the bottom gate of the first dual-gate transistor to adjust the threshold voltage of the first dual-gate transistor.

[0010] In a second aspect, an embodiment of the present invention provides a threshold adjustment method, which is used to implement the threshold adjustment circuit described in the first aspect. The threshold adjustment method includes:

[0011] In the initialization phase, the first initialization module is turned on, and the first initialization module initializes the top gate of the first dual-gate transistor;

[0012] In the threshold adjustment stage, the threshold adjustment module and the first dual-gate transistor are turned on, and the first power supply signal charges the first storage module through the first dual-gate transistor and the threshold adjustment module to control the potential of the bottom gate of the first dual-gate transistor, thereby adjusting the threshold voltage of the first dual-gate transistor.

[0013] In a third aspect, an embodiment of the present invention provides a pixel driving circuit, the pixel driving circuit comprising: a data writing module, a driving module, a light emitting module, a second storage module, a first storage module, a first initialization module, and a threshold adjustment module, wherein the driving module comprises a first dual-gate transistor;

[0014] The data writing module is connected to the top gate of the first dual-gate transistor, and the data writing module is used to write the data voltage signal into the driving module;

[0015] A first terminal of the first dual-gate transistor is connected to a first power supply signal, a second terminal of the first dual-gate transistor is connected to a first terminal of the light-emitting module, the driving module is configured to generate a driving current, and the light-emitting module is configured to emit light in response to the driving current;

[0016] The top gate of the first dual-gate transistor is connected to the second storage module, and the bottom gate of the first dual-gate transistor is connected to the first storage module; the second storage module is used to maintain the potential of the top gate of the first dual-gate transistor, and the first storage module is used to maintain the potential of the bottom gate of the first dual-gate transistor;

[0017] The first initialization module is electrically connected to the top gate of the first dual-gate transistor, and the first initialization module is used to initialize the top gate of the first dual-gate transistor;

[0018] The first end of the threshold adjustment module is connected to the second end of the first dual-gate transistor, and the second end of the threshold adjustment module is electrically connected to the bottom gate of the first dual-gate transistor. The threshold adjustment module is used to control the potential of the bottom gate of the first dual-gate transistor to adjust the threshold voltage of the first dual-gate transistor.

[0019] Optionally, the pixel driving circuit further includes: a second initialization module;

[0020] The second initialization module is used to initialize the light emitting module, and / or the second initialization module is used to initialize the bottom gate of the first dual-gate transistor through the threshold adjustment module;

[0021] Preferably, the control end of the second initialization module receives the first scanning signal, the first end of the second initialization module receives the first initialization signal, the second end of the second initialization module is electrically connected to the first end of the light-emitting module, and the second end of the light-emitting module receives the second power signal;

[0022] The second end of the second initialization module is also electrically connected to the first end of the threshold adjustment module;

[0023] Preferably, the second initialization module includes a fifth transistor, the first end of the fifth transistor is the first end of the second initialization module, the second end of the fifth transistor is the second end of the second initialization module, and the control end of the fifth transistor is the control end of the second initialization module.

[0024] Optionally, the control terminal of the first initialization module is connected to the second scanning signal, the first terminal of the first initialization module is connected to the second initialization signal, and the second terminal of the first initialization module is electrically connected to the top gate of the first dual-gate transistor;

[0025] Preferably, the first initialization module includes a fourth transistor, the first end of the fourth transistor is the first end of the first initialization module, the second end of the fourth transistor is the second end of the first initialization module, and the control end of the fourth transistor is the control end of the first initialization module.

[0026] Optionally, the pixel driving circuit further includes: a light emitting control module, the light emitting control module being arranged between the driving module and the light emitting module, and being configured to control the light emitting module in a light emitting stage;

[0027] Preferably, the second end of the first dual-gate transistor is electrically connected to the first end of the light emitting control module, the second end of the light emitting control module is electrically connected to the first end of the light emitting module, and the control end of the light emitting control module is connected to an enable signal.

[0028] Optionally, a top gate of the first dual-gate transistor is electrically connected to a first end of the second storage module, and a second end of the second storage module is electrically connected to a first end of the first dual-gate transistor;

[0029] And / or, the bottom gate of the first dual-gate transistor is electrically connected to the first end of the first storage module, and the second end of the second storage module is electrically connected to the first end of the first dual-gate transistor;

[0030] Preferably, the second storage module includes a second capacitor, a first end of the second capacitor is the first end of the second storage module, and a second end of the second capacitor is the second end of the second storage module;

[0031] Preferably, the first storage module includes a first capacitor, a first end of the first capacitor is the first end of the first storage module, and a second end of the first capacitor is the second end of the first storage module.

[0032] Optionally, the control terminal of the threshold adjustment module is connected to the second scanning signal, and the threshold adjustment module includes a second transistor;

[0033] The first end of the second transistor is the first end of the threshold adjustment module, the control end of the second transistor is the control end of the threshold adjustment module, and the second end of the second transistor is the second end of the threshold adjustment module;

[0034] And / or, the control end of the data writing module is connected to the third scanning signal, the first end of the data writing module is connected to the data voltage signal, and the second end of the data writing module is electrically connected to the top gate of the first dual-gate transistor;

[0035] Preferably, the data writing module includes a third transistor, the first end of the third transistor is the first end of the data writing module, the second end of the third transistor is the second end of the data writing module, and the control end of the third transistor is the control end of the data writing module.

[0036] Optionally, a voltage value corresponding to the second initialization signal is smaller than a voltage value corresponding to the first power supply signal.

[0037] In a fourth aspect, an embodiment of the present invention further provides a driving method for a pixel driving circuit, the driving method being used to drive any of the pixel driving circuits described in the third aspect, the driving method comprising:

[0038] In the initialization phase, the first initialization module is turned on, and the first initialization module initializes the top gate of the driving module;

[0039] In the threshold adjustment stage, the threshold adjustment module and the driving module are turned on, and the first power signal charges the first storage module through the driving module and the threshold adjustment module to control the potential of the bottom gate of the driving module to adjust the threshold voltage of the driving module;

[0040] In the data writing phase, the data writing module is turned on, and the data writing module writes the data voltage signal into the driving module;

[0041] In the light-emitting stage, the driving module is turned on, the driving module generates a driving current according to the data voltage signal, and the light-emitting module emits light in response to the driving current.

[0042] In a fifth aspect, an embodiment of the present invention further provides a display panel, which includes any pixel driving circuit described in the third aspect.

[0043] In the present invention, a threshold adjustment circuit includes: a first initialization module, a first dual-gate transistor, a first storage module, and a threshold adjustment module; the first dual-gate transistor includes a top gate and a bottom gate, and the threshold voltage of the first dual-gate transistor is negatively correlated with the bottom gate voltage. The threshold adjustment module can control the threshold voltage of the first dual-gate transistor by controlling the potential of the bottom gate of the first dual-gate transistor, and adjust the threshold voltage of the first dual-gate transistor so that the driving current generated by the first dual-gate transistor is not uneven due to uneven threshold voltage; applying the threshold voltage adjustment circuit to a display panel pixel driving circuit can improve the display uniformity of the display panel. The technical solution of this embodiment solves the problem of uneven driving current caused by uneven intrinsic threshold voltage of low-temperature polysilicon transistors due to process problems, thereby improving the display uniformity of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 1 is a schematic diagram of a circuit structure of a threshold adjustment circuit provided by an embodiment of the present invention;

[0045] Figure 2 This is a threshold adjustment method provided by an embodiment of the present invention;

[0046] Figure 3 1 is a schematic diagram of a circuit structure of a pixel driving circuit provided by an embodiment of the present invention;

[0047] Figure 4 1 is a circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0048] Figure 5 1 is a circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0049] Figure 6 1 is a circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0050] Figure 7 This is a flowchart of a pixel driving circuit driving method provided by an embodiment of the present invention;

[0051] Figure 8 This is a timing diagram corresponding to a pixel driving circuit provided by an embodiment of the present invention;

[0052] Figure 9 is a timing diagram corresponding to another pixel driving circuit provided by an embodiment of the present invention;

[0053] Figure 10A schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0054] Figure 11 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0056] As mentioned in the background technology, the existing display panels have the problem of uneven display. After careful research, the applicant found that the reason for this technical problem is that the driving transistors in the pixel driving circuit of the display panel mostly use low-temperature polysilicon transistors. Due to the process reasons of low-temperature polysilicon transistors, there are differences between different driving transistors, which makes the intrinsic threshold voltage Vth0 of the driving transistor inconsistent, thereby making the driving current generated by the driving transistor uneven, resulting in uneven display of the display panel.

[0057] In order to solve the above problems, an embodiment of the present invention provides a threshold adjustment circuit. Figure 1 is a schematic diagram of a circuit structure of a threshold adjustment circuit provided by an embodiment of the present invention, with reference to Figure 1 The threshold adjustment circuit includes: a first initialization module 106, a first dual-gate transistor T1, a first storage module 105 and a threshold adjustment module 107; the first initialization module 106 is electrically connected to the top gate of the first dual-gate transistor T1, and the first initialization module 106 is used to initialize the top gate of the first dual-gate transistor T1; a first end of the first storage module 105 is electrically connected to the bottom gate of the first dual-gate transistor T1, and the first storage module 105 is used to maintain the potential of the bottom gate of the first dual-gate transistor T1; a first end of the first dual-gate transistor T1 is connected to the first power supply signal VDD; a first end of the threshold adjustment module 107 is connected to the second end of the first dual-gate transistor T1, and a second end of the threshold adjustment module 107 is electrically connected to the bottom gate of the first dual-gate transistor T1, and the threshold adjustment module 107 is used to control the potential of the bottom gate of the first dual-gate transistor T1 to adjust the threshold voltage of the first dual-gate transistor T1.

[0058] The first dual-gate transistor T1 includes a top gate and a bottom gate, and a threshold voltage of the first dual-gate transistor T1 is negatively correlated with the bottom gate voltage, that is, when the bottom gate voltage of the first dual-gate transistor T1 increases, the threshold voltage of the first dual-gate transistor T1 decreases; when the bottom gate voltage of the first dual-gate transistor T1 decreases, the threshold voltage of the first dual-gate transistor T1 increases. Therefore, the threshold adjustment module 107 adjusts the threshold voltage of the first dual-gate transistor T1 by controlling the potential of the bottom gate of the first dual-gate transistor T1, so that the threshold voltage of the first dual-gate transistor T1 is not affected by its intrinsic threshold voltage Vth0, so that the driving current generated by the first dual-gate transistor T1 under the same gate voltage is not uneven due to individual differences between the first dual-gate transistors T1, thereby improving the display uniformity of the display panel.

[0059] Specifically, the first initialization module 106 can initialize the top gate of the first dual-gate transistor T1 so that the top gate voltage of the first dual-gate transistor T1 is equal to the initialization signal Vref. The first terminal of the first dual-gate transistor T1 is connected to the first power supply signal VDD, for example, which is a positive voltage signal. The first power supply signal VDD can charge the first storage module 105 through the first dual-gate transistor T1 and the threshold adjustment module 107, thereby increasing the bottom gate potential of the first dual-gate transistor T1 and thereby reducing the threshold voltage Vth of the first dual-gate transistor T1 until the threshold voltage Vth of the first dual-gate transistor T1 is equal to the difference between the voltage of the top gate and the first terminal of the first dual-gate transistor T1, Vref-VDD, and the first dual-gate transistor T1 is turned off. That is, after adjustment, the threshold voltage Vth of different first dual-gate transistors T1 is Vref-VDD. The threshold voltage Vth of each first dual-gate transistor T1 is only related to the initialization signal vref and the first power supply signal VDD, and is not related to its intrinsic threshold voltage Vth0. This reduces the influence of differences between different individual driving transistors, and the threshold voltage Vth of different first dual-gate transistors T1 remains consistent. When the threshold adjustment circuit is applied to the pixel drive circuit of the display panel, the first dual-gate transistor T1 can be used as the driving transistor of the pixel drive circuit. The threshold of the driving transistor is adjustable, and the threshold voltage of the driving transistor after adjustment is not affected by its intrinsic threshold voltage Vth0. In other words, there is no problem of uneven threshold voltage of the driving transistor, nor is there a problem of uneven driving current caused by inconsistent threshold voltage. When the top gate voltage of the first dual-gate transistor T1 is the data voltage signal Vdata, the potential difference between the top gate of the first dual-gate transistor T1 and the first end of the first dual-gate transistor T1 is Vgs = Vdata - VDD. Therefore, the driving current I generated by the first dual-gate transistor T1 is K (Vgs - Vth). 2 =K[Vdata-VDD-

[0060] (Vref-VDD)] 2=K(Vdata-Vref) 2 , where K is a constant related to the first dual-gate transistor T1. This ensures that the drive current generated by the first dual-gate transistor T1 is independent of the threshold voltage Vth of the first dual-gate transistor T1. Consequently, the drive current is only related to the initialization signal Vref and the data voltage signal Vdata, thereby achieving a threshold compensation effect and resolving the problem of uneven drive current caused by non-uniform intrinsic threshold voltages of low-temperature polysilicon transistors due to process issues. Furthermore, the drive current is independent of the first power supply signal VDD, so the voltage drop loss of the first power supply signal VDD does not affect the magnitude of the drive current. This allows the light-emitting module in the pixel drive circuit of the display panel to better display the desired brightness, improves the display uniformity of the display panel, and facilitates an improved display quality of the display panel.

[0061] The technical solution of the embodiment of the present invention is that the threshold adjustment circuit includes: a first initialization module, a first dual-gate transistor, a first storage module and a threshold adjustment module; the first dual-gate transistor includes a top gate and a bottom gate, and the threshold voltage of the first dual-gate transistor is negatively correlated with the bottom gate voltage. The threshold adjustment module can control the threshold voltage of the first dual-gate transistor by controlling the potential of the bottom gate of the first dual-gate transistor, and adjust the threshold voltage of the first dual-gate transistor so that the driving current generated by the first dual-gate transistor is not uneven due to uneven threshold voltage; applying the threshold voltage adjustment circuit to the pixel driving circuit of the display panel can improve the display uniformity of the display panel. The technical solution of this embodiment solves the problem of uneven driving current caused by uneven intrinsic threshold voltage of low-temperature polysilicon transistors due to process problems, thereby improving the display uniformity of the display panel.

[0062] Figure 2 A threshold adjustment method is provided in an embodiment of the present invention. The threshold adjustment method is used to implement the threshold adjustment circuit provided in the above embodiment. Figure 2 , the threshold adjustment methods include:

[0063] S100 , in an initialization phase, a first initialization module is turned on, and the first initialization module initializes a top gate of a first dual-gate transistor.

[0064] Specifically, refer to Figure 1 In the initialization stage, the first initialization module 106 is turned on, and the first initialization module 106 can write the initialization signal Vref into the top gate of the first dual-gate transistor T1 to initialize the top gate of the first dual-gate transistor T1, so that the top gate voltage of the first dual-gate transistor T1 is the initialization signal Vref.

[0065] S200. In the threshold adjustment stage, the threshold adjustment module and the first dual-gate transistor are turned on, and the first power supply signal charges the first storage module through the first dual-gate transistor and the threshold adjustment module to control the potential of the bottom gate of the first dual-gate transistor, thereby adjusting the threshold voltage of the first dual-gate transistor.

[0066] Specifically, refer to Figure 1 In the threshold adjustment stage, the threshold adjustment module 107 is turned on, and the first dual-gate transistor T1 is turned on. The first power supply signal VDD charges the first storage module 105 through the first dual-gate transistor T1 and the threshold adjustment module 107, so that the bottom gate potential of the first dual-gate transistor T1 increases, thereby reducing the threshold voltage of the first dual-gate transistor T1 until the threshold voltage Vth of the first dual-gate transistor T1 is equal to the difference between the voltage of the top gate and the first end of the first dual-gate transistor T1, Vref-VDD. The first dual-gate transistor T1 is turned off, so the threshold voltage Vth of the first dual-gate transistor T1 is Vref-VDD. In this way, the threshold voltage is adjusted, solving the problem of uneven intrinsic threshold voltage of low-temperature polysilicon transistors due to process problems, which leads to uneven driving current. The threshold adjustment circuit is applied to the pixel driving circuit of the display panel. The first dual-gate transistor T1 can be used as the driving transistor of the pixel driving circuit, and the threshold of the driving transistor is adjustable. When the top gate voltage of the first dual-gate transistor T1 is the data voltage signal Vdata, the potential difference between the top gate of the first dual-gate transistor T1 and the first end of the first dual-gate transistor T1 is Vgs=Vdata-VDD. Therefore, the driving current I generated by the first dual-gate transistor T1 is K(Vgs-Vth). 2 =K[Vdata-VDD-(Vref-VDD)] 2 =K(Vdata-Vref) 2 , where K is a constant related to the first dual-gate transistor T1, so that the driving current generated by the first dual-gate transistor T1 is independent of the threshold voltage Vth of the first dual-gate transistor T1, so that the driving current is only related to the initialization signal Vref and the data voltage signal Vdata, thereby achieving the effect of threshold compensation, and the driving current is independent of the first power supply signal VDD, so the voltage drop loss of the first power supply signal VDD will not affect the magnitude of the driving current, so that the light-emitting module of the pixel driving circuit in the display panel can better display the brightness to be displayed, improve the display uniformity of the display panel, and help improve the display effect of the display panel.

[0067] An embodiment of the present invention provides a pixel driving circuit. Figure 3 is a circuit structure diagram of a pixel driving circuit provided by an embodiment of the present invention, with reference to Figure 3The pixel driving circuit includes: a data writing module 101, a driving module 102, a light emitting module 103, a second storage module 104, a first storage module 105, a first initialization module 106 and a threshold adjustment module 107. The driving module 102 includes a first dual-gate transistor T1; the data writing module 101 is connected to the top gate of the first dual-gate transistor T1, and the data writing module 101 is used to write the data voltage signal Vdata into the driving module 102; the second end of the first dual-gate transistor T1 is connected to the first end of the light emitting module 103, the driving module 102 is used to generate a driving current, and the light emitting module 103 is used to emit light in response to the driving current; the top gate of the first dual-gate transistor T1 is connected to the second storage module 104 The bottom gate of the first dual-gate transistor T1 is connected to the first storage module 105; the second storage module 104 is used to maintain the potential of the top gate of the first dual-gate transistor T1, and the first storage module 105 is used to maintain the potential of the bottom gate of the first dual-gate transistor T1; the first initialization module 106 is electrically connected to the top gate of the first dual-gate transistor T1, and the first initialization module 106 is used to initialize the top gate of the first dual-gate transistor T1; the first end of the threshold adjustment module 107 is connected to the second end of the first dual-gate transistor T1, and the second end is electrically connected to the bottom gate of the first dual-gate transistor T1, and the threshold adjustment module 107 is used to control the potential of the bottom gate of the first dual-gate transistor T1 to adjust the threshold voltage of the first dual-gate transistor T1.

[0068] Among them, the light-emitting module 103 can be, for example, an OLED (Organic Light-Emitting Diode). OLED is a current-type device and can only emit light under the action of a driving current. The driving module 102 can generate a corresponding driving current according to the data voltage signal Vdata, and the light-emitting module 103 can emit light in response to the driving current. The driving module 102 includes a first dual-gate transistor T1, which includes a top gate and a bottom gate. The threshold voltage of the first dual-gate transistor T1 is negatively correlated with the bottom gate voltage, that is, when the bottom gate voltage of the first dual-gate transistor T1 increases, the threshold voltage of the first dual-gate transistor T1 decreases; when the bottom gate voltage of the first dual-gate transistor T1 decreases, the threshold voltage of the first dual-gate transistor T1 increases. Therefore, the threshold adjustment module 107 can control the threshold voltage of the first dual-gate transistor T1 by controlling the potential of the bottom gate of the first dual-gate transistor T1, and adjust the threshold voltage of the first dual-gate transistor T1 so that the threshold voltage of the first dual-gate transistor T1 remains consistent after adjustment. In addition, the driving current generated by the first dual-gate transistor T1 under the same gate voltage will not be uneven due to individual differences between the first dual-gate transistors T1, thereby improving the display uniformity of the display panel.

[0069] Specifically, the first initialization module 106 can initialize the top gate of the first dual-gate transistor T1 so that the top gate voltage of the first dual-gate transistor T1 is the initialization signal Vref (ie Figure 3 The first terminal of the first dual-gate transistor T1 is connected to the first power supply signal VDD, for example, which is a positive voltage signal. The first power supply signal VDD can charge the first storage module 105 through the first dual-gate transistor T1 and the threshold adjustment module 107, so that the bottom gate potential of the first dual-gate transistor T1 increases, thereby reducing the threshold voltage Vth of the first dual-gate transistor T1 until the threshold voltage Vth of the first dual-gate transistor T1 is equal to the difference Vref-VDD between the top gate and the first terminal of the first dual-gate transistor T1. The first dual-gate transistor T1 is turned off, so the threshold voltage Vth of the first dual-gate transistor T1 is Vref-VDD. The threshold voltages Vth of different first dual-gate transistors remain consistent after adjustment, thereby solving the problem that the intrinsic threshold voltage Vth0 of the low-temperature polysilicon transistor is non-uniform due to process problems, which causes non-uniform driving current. The data writing module 101 then writes the data voltage signal Vdata into the top gate of the first dual-gate transistor T1. The potential difference between the top gate of the first dual-gate transistor T1 and the first terminal of the first dual-gate transistor T1 is Vgs=Vdata-VDD. The driving current generated by the first dual-gate transistor T1 is I=K(Vgs-Vth). 2 =K[Vdata-VDD-(Vref-VDD)] 2 =K(Vdata-Vref) 2 , where K is a constant related to the driving module 102, so that the driving current generated by the driving module 102 is independent of the threshold voltage Vth of the driving module 102, so that the driving current is only related to the initialization signal Vref and the data voltage signal Vdata, thereby achieving the effect of threshold compensation, and the driving current is independent of the first power supply signal VDD, so the voltage drop loss of the first power supply signal VDD will not affect the magnitude of the driving current, so that the light-emitting module 103 can better display the brightness to be displayed, improve the display uniformity of the display panel, and help improve the display effect of the display panel.

[0070] The technical solution of this embodiment includes a pixel driving circuit comprising: a data writing module, a driving module, a light-emitting module, a second storage module, a first storage module, a first initialization module, and a threshold adjustment module. The light-emitting module can only emit light under the action of a driving current. The driving module can generate a corresponding driving current based on a data voltage signal, and the light-emitting module can emit light in response to the driving current. The driving module includes a first dual-gate transistor, which includes a top gate and a bottom gate. The threshold voltage of the first dual-gate transistor is negatively correlated with the bottom gate voltage. The threshold adjustment module can control the threshold voltage of the first dual-gate transistor by controlling the potential of the bottom gate of the first dual-gate transistor, thereby compensating for the threshold voltage of the first dual-gate transistor. The adjusted threshold voltage Vth of different first dual-gate transistors remains consistent, so that the driving current generated by the first dual-gate transistor is not uneven due to uneven intrinsic threshold voltage Vth0, thereby improving the display uniformity of the display panel. The technical solution of this embodiment solves the problem of uneven driving current caused by uneven intrinsic threshold voltage Vth0 of low-temperature polysilicon transistors due to process issues, thereby improving the display uniformity of the display panel.

[0071] Figure 4 is a circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention. Figure 4 The pixel driving circuit further includes: a second initialization module 108; the second initialization module 108 is used to initialize the light-emitting module 103, and / or the second initialization module 108 is used to initialize the bottom gate of the first dual-gate transistor T1 through the threshold adjustment module 107; preferably, the control end of the second initialization module 108 is connected to the first scan signal Scan1, the first end of the second initialization module 108 is connected to the first initialization signal Vref1, the second end of the second initialization module 108 is electrically connected to the first end of the light-emitting module 103, and the second end of the light-emitting module 103 is connected to the second power supply signal VSS; the second end of the second initialization module 108 is also electrically connected to the first end of the threshold adjustment module 107.

[0072] Specifically, the second initialization module 108 can initialize the light-emitting module 103 and clear any residual charge from the previous frame, allowing the light-emitting module 103 to better display the brightness to be displayed. The second initialization module 108 can also initialize the bottom gate of the first dual-gate transistor T1 through the threshold adjustment module 107 to clear any residual charge from the bottom gate of the first dual-gate transistor T1, thereby facilitating control of the potential of the bottom gate of the first dual-gate transistor T1 and thereby facilitating control of the threshold voltage of the first dual-gate transistor T1, thereby achieving compensation for the threshold voltage and improving display uniformity of the display panel.

[0073] Optionally, refer to Figure 4The pixel driving circuit further includes: a light-emitting control module 109, which is arranged between the driving module 102 and the light-emitting module 103 and is used to control the light-emitting module 103 in the light-emitting stage; preferably, the second end of the first dual-gate transistor T1 is electrically connected to the first end of the light-emitting control module 109, the second end of the light-emitting control module 109 is electrically connected to the first end of the light-emitting module 102, and the control end of the light-emitting control module 109 is connected to the enable signal EM. The control end of the threshold adjustment module 107 is connected to the second scan signal Scan2, and the second end of the threshold adjustment module 107 is electrically connected to the bottom gate of the first dual-gate transistor T1; the top gate of the first dual-gate transistor T1 is electrically connected to the first end of the second storage module 104, and the second end of the second storage module 104 is connected to the first power supply signal VDD; the bottom gate of the first dual-gate transistor T1 is electrically connected to the first end of the first storage module 105, and the second end of the first storage module 105 is connected to the first power supply signal VDD; the control end of the data writing module 101 is connected to the third scan signal Scan3, the first end of the data writing module 101 is connected to the data voltage signal Vdata, and the second end of the data writing module 101 is electrically connected to the top gate of the first dual-gate transistor T1; the first end of the first dual-gate transistor T1 is connected to the first power supply signal VDD, the control end of the first initialization module 106 is connected to the second scan signal Scan2, the first end of the first initialization module 106 is connected to the second initialization signal Vref2, and the second end of the first initialization module 106 is electrically connected to the top gate of the first dual-gate transistor T1.

[0074] Specifically, in the initialization stage, the first scan signal Scan1 controls the second initialization module 108 to turn on, and after the second scan signal Scan2 controls the threshold adjustment module 107 to turn on, the second initialization module 108 initializes the first end of the light-emitting module 103, and the second initialization module 108 can also initialize the bottom gate of the first dual-gate transistor T1 through the threshold adjustment module 107; after the second scan signal Scan2 controls the first initialization module 106 to turn on, the first initialization module 106 can write the second initialization signal Vref2 into the top gate of the first dual-gate transistor T1, initialize the top gate of the first dual-gate transistor T1, so that the top gate voltage of the first dual-gate transistor T1 is the second initialization signal Vref2; in the threshold adjustment stage, the second scan signal Scan2 controls the threshold adjustment module 107 to turn on, and the first power supply signal VDD charges the first storage module 105 through the first dual-gate transistor T1 and the threshold adjustment module 107, so that the bottom gate of the first dual-gate transistor T1 is Vref2. The gate potential increases, thereby reducing the threshold voltage of the first dual-gate transistor T1 until the threshold voltage Vth of the first dual-gate transistor T1 is equal to the voltage difference Vref2-VDD between the top gate and the first terminal of the first dual-gate transistor T1. The first dual-gate transistor T1 is then turned off, so the threshold voltage Vth of the first dual-gate transistor T1 is Vref2-VDD, thereby adjusting the threshold voltage of the first dual-gate transistor T1 and solving the problem of uneven intrinsic threshold voltage and uneven driving current caused by process problems of low-temperature polysilicon transistors. In the data writing phase, after the third scan signal Scan3 controls the data writing module 101 to be turned on, the data writing module 101 writes the data voltage signal Vdata into the top gate of the first dual-gate transistor T1. Then, the potential difference Vgs between the top gate of the first dual-gate transistor T1 and the first terminal of the first dual-gate transistor T1 is Vdata-VDD. In the light-emitting phase, the driving current I generated by the first dual-gate transistor T1 is K(Vgs-Vth). 2 =K[Vdata-VDD-(Vref2-VDD)] 2 =K(Vdata-Vref2) 2 , so that the driving current is independent of the threshold voltage Vth of the driving module 102, thereby achieving the effect of threshold compensation. The first power supply signal VDD is, for example, a positive voltage signal, and the second power supply signal VSS is, for example, a negative voltage signal. Therefore, when the light-emitting control module 109 is turned on, it can provide the required current path for the light-emitting module 103 to emit light during the light-emitting phase, so that the light-emitting module 103 can emit light in response to the driving current to display the desired brightness.

[0075] Optionally, a voltage value corresponding to the second initialization signal Vref2 is smaller than a voltage value corresponding to the first power signal VDD.

[0076] Specifically, the voltage value corresponding to the second initialization signal Vref2 is less than the voltage value corresponding to the first power supply signal VDD, that is, the potential of the top gate of the first dual-gate transistor T1 is less than the potential of the first end of the first dual-gate transistor T1, so that the first dual-gate transistor T1 can be turned on, and the first power supply signal VDD can charge the first storage module 105 through the first dual-gate transistor T1 and the threshold adjustment module 107, thereby increasing the bottom gate potential of the first dual-gate transistor T1 and reducing the threshold voltage of the first dual-gate transistor, so that the threshold voltage of the first dual-gate transistor T1 can be adjusted, solving the problem of non-uniform intrinsic threshold voltage of low-temperature polysilicon transistors due to process problems, so that the driving current generated by the first dual-gate transistor T1 will not be non-uniform due to the non-uniform intrinsic threshold voltage, thereby improving the display uniformity of the display panel. The first power supply signal VDD is, for example, a positive voltage signal, and the second initialization signal Vref2 is, for example, also a positive voltage signal. The voltage value corresponding to the second initialization signal Vref2 is smaller than the voltage value corresponding to the first power supply signal VDD, so that the top gate potential of the first dual-gate transistor T1 is not too low, and the potential difference between the top gate and the first end of the first dual-gate transistor T1 is not too large. Therefore, when charging the first storage module 105, the bottom gate potential of the first dual-gate transistor T1 increases, and the threshold voltage of the first dual-gate transistor T1 can be reduced until the threshold voltage of the first dual-gate transistor T1 is equal to the potential difference between the top gate and the first end of the first dual-gate transistor T1. If the second initialization signal Vref2 is a negative voltage signal, the potential difference between the top gate and the first end of the first dual-gate transistor T1 is too large, and the threshold voltage of the first dual-gate transistor T1 is difficult to reduce, making it difficult to control the threshold voltage of the first dual-gate transistor T1.

[0077] In addition, since the second end of the first initialization signal Vref1 is connected to the second power signal VSS, and the second power signal VSS is, for example, a negative voltage signal, the first initialization signal Vref1 is a negative voltage signal, which can initialize the light-emitting module 103. If the first initialization signal Vref1 is a positive voltage signal, the light-emitting module 103 may be turned on, causing the light-emitting module 103 to emit light in advance, so that the display panel cannot display the image to be displayed.

[0078] Figure 5 is a circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention. Figure 5 The second storage module 104 includes a second capacitor C2, the first end of the second capacitor C2 is the first end of the second storage module 104, and the second end of the second capacitor C2 is the second end of the second storage module 104; the first storage module 105 includes a first capacitor C1, the first end of the first capacitor C1 is the first end of the first storage module 105, and the second end of the first capacitor C1 is the second end of the first storage module 105.

[0079] Specifically, the second capacitor C2 can maintain the potential of the top gate of the driver module 102. The second capacitor C2 can store the data voltage signal Vdata, so that the driver module 102 can generate a driving current according to the data voltage signal Vdata during the light-emitting phase. The first capacitor C1 can maintain the potential of the bottom gate of the driver module 102. When the first power signal VDD charges the first capacitor C1, the potential of the bottom gate of the driver module 102 can be changed to adjust the threshold voltage of the driver module 102.

[0080] Optionally, refer to Figure 5 The threshold adjustment module 107 includes a second transistor T2; the first end of the second transistor T2 is the first end of the threshold adjustment module 107, the control end of the second transistor T2 is the control end of the threshold adjustment module 107, and the second end of the second transistor T2 is the second end of the threshold adjustment module 107.

[0081] Specifically, the second transistor T2 can control the potential of the bottom gate of the first dual-gate transistor T1, thereby controlling the threshold voltage of the first dual-gate transistor T1 and compensating for the threshold voltage of the first dual-gate transistor T1. This prevents the drive current generated by the first dual-gate transistor T1 from being non-uniform due to the uneven intrinsic threshold voltage, thereby improving the display uniformity of the display panel. The second transistor T2 is, for example, a P-type transistor, and the first dual-gate transistor T1 is, for example, also a P-type transistor. P-type transistors are relatively low in cost, which helps reduce the cost of the display panel. In other embodiments, the second transistor T2 can also be an N-type transistor.

[0082] Optionally, refer to Figure 5 The data writing module 101 includes a third transistor T3, a first end of the third transistor T3 is the first end of the data writing module 101, a second end of the third transistor T3 is the second end of the data writing module 101, and a control end of the third transistor T3 is the control end of the data writing module 101.

[0083] Specifically, the third transistor T3 can write the data voltage signal Vdata into the driving module 102, so that the driving module 102 can generate a driving current according to the data voltage signal Vdata, thereby causing the light-emitting module 103 to emit light according to the driving current, so that the light-emitting module 103 can display the desired brightness. The third transistor T3 can be, for example, a P-type transistor. In other embodiments, the third transistor T3 can also be an N-type transistor.

[0084] Optionally, refer to Figure 5The first initialization module 106 includes a fourth transistor T4, a first end of the fourth transistor T4 serving as the first end of the first initialization module 106, a second end of the fourth transistor T4 serving as the second end of the first initialization module 106, and a control end of the fourth transistor T4 serving as the control end of the first initialization module 106. The second initialization module 108 includes a fifth transistor T5, a first end of the fifth transistor T5 serving as the first end of the second initialization module 108, a second end of the fifth transistor T5 serving as the second end of the second initialization module 108, and a control end of the fifth transistor T5 serving as the control end of the second initialization module 108. The fourth transistor T4 and the fifth transistor T5 are, for example, P-type transistors. In other embodiments, the fourth transistor T4 and the fifth transistor T5 may also be N-type transistors.

[0085] Specifically, the fourth transistor T4 can write the second initialization signal Vref2 into the top gate of the driver module 102 to initialize the driver module 102. The fifth transistor T5 can write the first initialization signal Vref1 into the first terminal of the light-emitting module 103 to initialize the light-emitting module 103 and eliminate the residual charge of the previous frame of the light-emitting module 103, so that the light-emitting module 103 can better display the brightness to be displayed, thereby improving the display effect of the display panel. The fifth transistor T5 can write the first initialization signal Vref1 into the bottom gate of the driver module 102 through the threshold adjustment module 107 to initialize the bottom gate of the driver module 102, thereby achieving better control of the bottom gate of the driver module 102 and thus better adjusting the threshold voltage of the driver module 102.

[0086] On the basis of the above implementation plan, Figure 6 is a circuit structure diagram of another pixel driving circuit provided by an embodiment of the present invention. Figure 6 The light-emitting control module 109 includes a sixth transistor T6. The first end of the sixth transistor T6 serves as the first end of the light-emitting control module 109, the control end of the sixth transistor T6 serves as the control end of the light-emitting control module 109, and the second end of the sixth transistor T6 serves as the second end of the light-emitting control module 109. The light-emitting module 103 includes an organic light-emitting diode D1. The first end of the organic light-emitting diode D1 serves as the first end of the light-emitting module 103, and the second end of the organic light-emitting diode D1 serves as the second end of the light-emitting module 103. The sixth transistor T6 is, for example, a P-type transistor. In other embodiments, the sixth transistor T6 may also be an N-type transistor.

[0087] Figure 7 This is a flowchart of a pixel driving circuit driving method provided by an embodiment of the present invention, with reference to Figure 7 The driving method of the pixel driving circuit is used to drive the pixel driving circuit described in any of the above embodiments, and the driving method of the pixel driving circuit includes:

[0088] S510 , in the initialization phase, the first initialization module is turned on, and the first initialization module initializes the top gate of the driving module.

[0089] Specifically, Figure 8 This is a timing diagram corresponding to a pixel driving circuit provided by an embodiment of the present invention, referring to Figure 8 and Figure 4 In stage t1, i.e., the initialization stage, the second scan signal Scan2 is at a low level, the first initialization module 106 is turned on, and the first initialization module 106 can write the second initialization signal Vref2 into the top gate of the first dual-gate transistor T1 to initialize the top gate of the first dual-gate transistor T1, so that the top gate voltage of the first dual-gate transistor T1 is the second initialization signal Vref2.

[0090] S520: In the threshold adjustment stage, the threshold adjustment module and the driving module are turned on, and the first power signal charges the first storage module through the driving module and the threshold adjustment module to control the potential of the bottom gate of the driving module to adjust the threshold voltage of the driving module.

[0091] Specifically, continue to refer to Figure 8 and Figure 4 In stage t2, i.e., the threshold adjustment stage, the second scan signal Scan2 is at a low level, the threshold adjustment module 107 is turned on, and the driving module 102 is turned on. The first power supply signal VDD charges the first storage module 105 through the first dual-gate transistor T1 and the threshold adjustment module 107, so that the bottom gate potential of the first dual-gate transistor T1 increases, thereby reducing the threshold voltage of the first dual-gate transistor T1 until the threshold voltage Vth of the first dual-gate transistor T1 is equal to the difference between the voltage of the top gate and the first end of the first dual-gate transistor T1, Vref2-VDD. The first dual-gate transistor T1 is turned off, so the threshold voltage Vth of the first dual-gate transistor T1 is Vref2-VDD.

[0092] S530 , in the data writing phase, the data writing module is turned on, and the data writing module writes the data voltage signal into the driving module.

[0093] Specifically, continue to refer to Figure 8 and Figure 4 In stage t3, i.e., the data writing stage, the third scanning signal Scan3 is at a low level, the data writing module 101 is turned on, and the data writing module 101 writes the data voltage signal Vdata into the top gate of the first dual-gate transistor T1. Then, the potential difference Vgs between the top gate of the first dual-gate transistor T1 and the first end of the first dual-gate transistor T1 is Vdata-VDD, which solves the problem of uneven intrinsic threshold voltage of low-temperature polysilicon transistors due to process problems, thereby causing uneven driving current.

[0094] S540 , in the light-emitting stage, the driving module is turned on, the driving module generates a driving current according to the data voltage signal, and the light-emitting module emits light in response to the driving current.

[0095] Specifically, continue to refer to Figure 8 and Figure 4 In the t4 phase, i.e., the light-emitting phase, the second storage module 104 maintains the top gate potential of the driving module 102 at the data voltage signal Vdata. The top gate potential of the driving module 102 is less than the potential of the first terminal of the driving module 102. The driving module 102 is turned on and generates a driving current I=K(Vgs-Vth). 2 =K[Vdata-VDD-(Vref2-VDD)] 2 =K(Vdata-Vref2) 2 , the light emitting module 103 emits light in response to the driving current, so that the driving current is independent of the threshold voltage Vth of the driving module 102, thereby achieving the effect of threshold compensation, so that the light emitting module 103 can better display the brightness to be displayed.

[0096] It should be noted that Figure 8 Only the case where all modules are turned on at a low level is shown, but this is not limiting. In other implementations, the conduction level type of each module may also be opposite to that of this embodiment.

[0097] Figure 9 This is a timing diagram corresponding to another pixel driving circuit provided by an embodiment of the present invention, referring to Figure 9 and Figure 4 The driving method of the pixel driving circuit further includes: in stage t1, i.e., the initialization stage, the first scanning signal Scan1 is at a low level, the second initialization module 108 is turned on, and the second initialization module 108 can write the first initialization signal Vref1 to the first terminal of the light-emitting module 103 to initialize the light-emitting module 103. The second initialization module 108 can also write the first initialization signal Vref1 to the bottom gate of the driving module 102 through the threshold adjustment module 107 to initialize the bottom gate of the driving module 102.

[0098] Figure 10 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention, referring to Figure 10The display panel includes multiple pixel driving circuits PX provided by any embodiment of the present invention. The display panel may include multiple crisscrossing scan lines (S1-Sk) and data lines (DL1-DLj). The pixel driving circuit is located in the area defined by the scan lines and the data lines. The data lines provide data voltage signals to the pixel driving circuit PX, so that the light-emitting modules in the pixel driving circuit PX can display the brightness to be displayed according to the data voltage signals. The scan lines provide scan signals to the pixel driving circuit PX, thereby controlling the conduction and shutdown of each module in the pixel driving circuit PX. The display panel includes a substrate, a bottom gate metal layer, an active layer, a top gate metal layer, and a power metal layer. The bottom gate metal layer is located on the surface of the substrate, so that the bottom gate metal layer can isolate impurity charges on the substrate, which is beneficial for improving the display effect of the display panel. Because the display panel includes the pixel driving circuit provided by any embodiment of the present invention, it also has the same beneficial effects, which will not be described in detail here.

[0099] Figure 11 A schematic diagram of a display device according to an embodiment of the present invention is provided. Figure 11 The display device includes the display panel provided by any embodiment of the present invention. The display device can be a mobile phone, a tablet, a monitor, a smart watch, an MP3, an MP4 or other wearable device, etc. Because it includes the display panel provided by any embodiment of the present invention, it also has the same beneficial effects and will not be repeated here.

[0100] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection 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 and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A threshold adjustment circuit, characterized in that: include: A first initialization module, a first dual-gate transistor, a first storage module and a threshold adjustment module; The first initialization module is electrically connected to the top gate of the first dual-gate transistor, and the first initialization module is configured to be turned on during an initialization phase and write an initialization signal into the top gate of the first dual-gate transistor so that the top gate voltage of the first dual-gate transistor is the initialization signal; The first end of the first storage module is electrically connected to the bottom gate of the first dual-gate transistor, and the first storage module is used to maintain the potential of the bottom gate of the first dual-gate transistor; The first terminal of the first dual-gate transistor is connected to a first power supply signal; The first end of the threshold adjustment module is connected to the second end of the first dual-gate transistor, and the second end of the threshold adjustment module is electrically connected to the bottom gate of the first dual-gate transistor. The threshold adjustment module and the first dual-gate transistor are turned on in the threshold adjustment stage. The first power supply signal charges the first storage module through the first dual-gate transistor and the threshold adjustment module to control the potential of the bottom gate of the first dual-gate transistor, thereby adjusting the threshold voltage of the first dual-gate transistor.

2. A threshold adjustment method, characterized in that: The threshold adjustment method is used to implement the threshold adjustment circuit according to claim 1, and the threshold adjustment method includes: In the initialization phase, the first initialization module is turned on, and the first initialization module initializes the top gate of the first dual-gate transistor; In the threshold adjustment stage, the threshold adjustment module and the first dual-gate transistor are turned on, and the first power supply signal charges the first storage module through the first dual-gate transistor and the threshold adjustment module to control the potential of the bottom gate of the first dual-gate transistor, thereby adjusting the threshold voltage of the first dual-gate transistor.

3. A pixel driving circuit, characterized in that: include: a data writing module, a driving module, a light emitting module, a first storage module, a second storage module, a first initialization module and a threshold adjustment module, wherein the driving module includes a first dual-gate transistor; The data writing module is connected to the top gate of the first dual-gate transistor, and the data writing module is used to write the data voltage signal into the driving module; A first terminal of the first dual-gate transistor is connected to a first power supply signal, a second terminal of the first dual-gate transistor is connected to a first terminal of the light-emitting module, the driving module is configured to generate a driving current, and the light-emitting module is configured to emit light in response to the driving current; The top gate of the first dual-gate transistor is connected to the second storage module, and the bottom gate of the first dual-gate transistor is connected to the first storage module; the second storage module is used to maintain the potential of the top gate of the first dual-gate transistor, and the first storage module is used to maintain the potential of the bottom gate of the first dual-gate transistor; The first initialization module is electrically connected to the top gate of the first dual-gate transistor, and the first initialization module is configured to be turned on during an initialization phase and write an initialization signal into the top gate of the first dual-gate transistor so that the top gate voltage of the first dual-gate transistor is the initialization signal; The first end of the threshold adjustment module is connected to the second end of the first dual-gate transistor, and the second end of the threshold adjustment module is electrically connected to the bottom gate of the first dual-gate transistor. The threshold adjustment module and the first dual-gate transistor are turned on in the threshold adjustment stage. The first power supply signal charges the first storage module through the first dual-gate transistor and the threshold adjustment module to control the potential of the bottom gate of the first dual-gate transistor, thereby adjusting the threshold voltage of the first dual-gate transistor.

4. The pixel driving circuit according to claim 3, wherein: Also includes: Second initialization module; The second initialization module is used to initialize the light emitting module, and / or the second initialization module is used to initialize the bottom gate of the first dual-gate transistor through the threshold adjustment module.

5. The pixel driving circuit according to claim 4, wherein: The control end of the second initialization module receives the first scanning signal, the first end of the second initialization module receives the first initialization signal, the second end of the second initialization module is electrically connected to the first end of the light-emitting module, and the second end of the light-emitting module receives the second power signal; The second end of the second initialization module is also electrically connected to the first end of the threshold adjustment module.

6. The pixel driving circuit according to claim 4, wherein: The second initialization module includes a fifth transistor, a first end of the fifth transistor is the first end of the second initialization module, a second end of the fifth transistor is the second end of the second initialization module, and a control end of the fifth transistor is the control end of the second initialization module.

7. The pixel driving circuit according to claim 3, wherein: The control terminal of the first initialization module receives the second scanning signal, the first terminal of the first initialization module receives the second initialization signal, and the second terminal of the first initialization module is electrically connected to the top gate of the first dual-gate transistor.

8. The pixel driving circuit according to claim 3, wherein: The first initialization module includes a fourth transistor, a first end of the fourth transistor is the first end of the first initialization module, a second end of the fourth transistor is the second end of the first initialization module, and a control end of the fourth transistor is the control end of the first initialization module.

9. The pixel driving circuit according to claim 3, wherein: Also includes: A light emitting control module is provided between the driving module and the light emitting module, and is used to control the light emitting module in a light emitting stage.

10. The pixel driving circuit according to claim 9, wherein: The second end of the first dual-gate transistor is electrically connected to the first end of the light emitting control module, the second end of the light emitting control module is electrically connected to the first end of the light emitting module, and the control end of the light emitting control module is connected to an enable signal.

11. The pixel driving circuit according to claim 3, wherein: The top gate of the first dual-gate transistor is electrically connected to the first end of the second storage module, and the second end of the second storage module is electrically connected to the first end of the first dual-gate transistor; And / or, the bottom gate of the first dual-gate transistor is electrically connected to the first end of the first storage module, and the second end of the first storage module is electrically connected to the first end of the first dual-gate transistor.

12. The pixel driving circuit according to claim 3, wherein: The second storage module includes a second capacitor, a first end of the second capacitor is the first end of the second storage module, and a second end of the second capacitor is the second end of the second storage module.

13. The pixel driving circuit according to claim 3, wherein: The first storage module includes a first capacitor, a first end of the first capacitor is the first end of the first storage module, and a second end of the first capacitor is the second end of the first storage module.

14. The pixel driving circuit according to claim 3, wherein: The control terminal of the threshold adjustment module is connected to the second scanning signal, and the threshold adjustment module includes a second transistor; The first end of the second transistor is the first end of the threshold adjustment module, the control end of the second transistor is the control end of the threshold adjustment module, and the second end of the second transistor is the second end of the threshold adjustment module; And / or, the control end of the data writing module is connected to the third scanning signal, the first end of the data writing module is connected to the data voltage signal, and the second end of the data writing module is electrically connected to the top gate of the first dual-gate transistor.

15. The pixel driving circuit according to claim 3, wherein: The data writing module includes a third transistor, a first end of the third transistor is the first end of the data writing module, a second end of the third transistor is the second end of the data writing module, and a control end of the third transistor is the control end of the data writing module.

16. The pixel driving circuit according to claim 7, wherein: A voltage value corresponding to the second initialization signal is smaller than a voltage value corresponding to the first power signal.

17. A driving method for a pixel driving circuit, characterized in that: The driving method is used to drive the pixel driving circuit according to any one of claims 3 to 16, and the driving method includes: In the initialization phase, the first initialization module is turned on, and the first initialization module initializes the top gate of the driving module; In the threshold adjustment stage, the threshold adjustment module and the driving module are turned on, and the first power signal charges the first storage module through the driving module and the threshold adjustment module to control the potential of the bottom gate of the driving module to adjust the threshold voltage of the driving module; In the data writing phase, the data writing module is turned on, and the data writing module writes the data voltage signal into the driving module; In the light-emitting stage, the driving module is turned on, the driving module generates a driving current according to the data voltage signal, and the light-emitting module emits light in response to the driving current.

18. A display panel, characterized in that: The pixel driving circuit comprises the pixel driving circuit according to any one of claims 3 to 16.

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