Pixel driving circuit and display panel

Abstract

The present invention discloses a pixel driving circuit and a display panel. The pixel driving circuit includes: a driving module, a data writing module, a storage module, a light emitting module, and a compensation module; the data writing module is configured to provide a data signal for the driving module during a data writing stage; the storage module is configured to store the data signal; the driving module is connected between a first power supply signal line and a first end of the light emitting module, and the driving module is configured to generate a driving current according to the data signal during a light emitting stage, a second end of the light emitting module is connected to a second power supply signal line, and the light emitting module is configured to emit light in response to the driving current; the compensation module is electrically connected to the first end of the light emitting module, and the compensation module is configured to compensate the potential of the first end of the light emitting module when the potential of the first end of the light emitting module is less than a first power supply signal provided by the first power supply signal line. The technical solution of the embodiment of the present invention improves the display uniformity of the display panel.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a pixel driving circuit and a display panel. Background Art

[0002] With the development of display technologies, the requirement for the display uniformity of display panels is getting higher and higher.

[0003] In a display panel, a first power signal line provides a first power signal for a pixel driving circuit, so that the pixel driving circuit generates a driving current according to the first power signal and a data voltage to drive a light-emitting device to emit light. However, the brightness uniformity of the display panel in the prior art is poor. Summary of the Invention

[0004] The present invention provides a pixel driving circuit and a display panel to improve the display uniformity of the display panel.

[0005] According to an aspect of the present invention, a pixel driving circuit is provided. The pixel driving circuit includes: a driving module, a data writing module, a storage module, a light-emitting module, and a compensation module;

[0006] The data writing module is connected between the driving module and a data signal line, and the data writing module is configured to provide a data signal for the driving module in a data writing stage;

[0007] The storage module is connected between a first power signal line and the driving module, and the storage module is configured to store the data signal;

[0008] The driving module is connected between the first power signal line and a first end of the light-emitting module. The driving module is configured to generate a driving current according to the data signal in a light-emitting stage. A second end of the light-emitting module is connected to a second power signal line, and the light-emitting module is configured to emit light in response to the driving current;

[0009] The compensation module is electrically connected to the first end of the light-emitting module, and the compensation module is configured to compensate the potential of the first end of the light-emitting module when the potential of the first end of the light-emitting module is less than the first power signal provided by the first power signal line.

[0010] By providing the compensation module, when the potential of the first end of the light-emitting module is less than the first power signal, the compensation module compensates the potential of the first end of the light-emitting module to improve the display uniformity of the display panel.

[0011] Optionally, the compensation module includes a first transistor;

[0012] The control terminal of the data writing module is connected to the first scanning signal line, the first terminal of the data writing module is connected to the data signal line, and the second terminal of the data writing module is electrically connected to the control terminal of the driving module;

[0013] The first terminal of the storage module is connected to the first power supply signal line, and the second terminal of the storage module is electrically connected to the control terminal of the driving module;

[0014] The first terminal of the driving module is connected to the first power supply signal line, and the second terminal of the driving module is electrically connected to the first terminal of the light emitting module;

[0015] The control terminal of the first transistor is connected to the control signal line, the first terminal of the first transistor is electrically connected to the second terminal of the driving module, and the second terminal of the first transistor is electrically connected to the first terminal of the light emitting module.

[0016] The compensation module includes a first transistor. When the potential of the first terminal of the light emitting module is less than the first power supply signal, the first transistor conducts to compensate the potential of the first terminal of the light emitting module.

[0017] Optionally, the pixel driving circuit further includes a first light emitting control module; the compensation module includes a first transistor;

[0018] The control terminal of the data writing module is connected to the first scanning signal line, the first terminal of the data writing module is connected to the data signal line, and the second terminal of the data writing module is electrically connected to the first terminal of the driving module;

[0019] The first terminal of the storage module is connected to the first power supply signal line, and the second terminal of the storage module is electrically connected to the control terminal of the driving module;

[0020] The first terminal of the driving module is connected to the first power supply signal line;

[0021] The control terminal of the first light emitting control module is connected to the enable signal line, the first terminal of the first light emitting control module is electrically connected to the second terminal of the driving module, and the second terminal of the first light emitting control module is electrically connected to the first terminal of the light emitting module;

[0022] The control terminal of the first transistor is connected to the control signal line, the first terminal of the first transistor is electrically connected to the second terminal of the first light emitting control module, and the second terminal of the first transistor is electrically connected to the first terminal of the light emitting module.

[0023] When the first light emitting control module conducts, the first terminal of the light emitting module is connected to the driving module through the first light emitting control module. When the potential of the first terminal of the light emitting module is less than the first power supply signal, the first transistor conducts to compensate the potential of the first terminal of the light emitting module.

[0024] Optionally, the first transistor is an N-type transistor;

[0025] The gate of the N-type transistor is the control terminal of the first transistor, the first pole of the N-type transistor is the first terminal of the first transistor, and the second pole of the N-type transistor is the second terminal of the first transistor.

[0026] When the first transistor is an N-type transistor and the potential of the source of the N-type transistor is less than the potential of its gate, the N-type transistor is turned on to compensate the anode potential of the light-emitting diode.

[0027] Optionally, the first power supply signal line is multiplexed as the control signal line, or the first scan signal line is multiplexed as the control signal line.

[0028] When the first transistor is an N-type transistor, the first power supply signal line or the first scan signal line is multiplexed as the control signal line, reducing the number of traces, which is beneficial to the layout design.

[0029] Optionally, the first transistor is a P-type transistor;

[0030] The gate of the P-type transistor is the control terminal of the first transistor, the first pole of the P-type transistor is the first terminal of the first transistor, and the second pole of the P-type transistor is the second terminal of the first transistor.

[0031] When the first transistor is a P-type transistor and the potential of the gate of the P-type transistor is less than the potential of its source, the P-type transistor is turned on to compensate the anode potential of the light-emitting diode.

[0032] Optionally, the second power supply signal line is multiplexed as the control signal line.

[0033] When the first transistor is a P-type transistor, the second power supply signal line can be multiplexed as the control signal line, reducing the number of traces, which is beneficial to the layout design.

[0034] Optionally, the compensation module further includes a first capacitor;

[0035] The first end of the first capacitor is connected to the control signal line, and the second end of the first capacitor is electrically connected to the control terminal of the first transistor.

[0036] The voltage of the discharge of the first capacitor can control the potential of the control terminal of the first transistor, thereby controlling the opening degree of the first transistor. Different opening degrees result in different voltages compensated by the first transistor to the first terminal of the light-emitting module.

[0037] Optionally, the pixel driving circuit further includes: a threshold compensation module;

[0038] The control terminal of the threshold compensation module is connected to the first scan signal line. The first terminal of the threshold compensation module is electrically connected to the second terminal of the driving module. The second terminal of the threshold compensation module is electrically connected to the control terminal of the driving module. The threshold compensation module is configured to capture the threshold voltage of the driving module to the control terminal of the driving module.

[0039] Preferably, the pixel driving circuit further includes: a second light emission control module, a first initialization module, and a second initialization module. The control terminal of the second light emission control module is connected to the enable signal line. The first terminal of the second light emission control module is connected to the first power signal line. The second terminal of the second light emission control module is electrically connected to the first terminal of the driving module. The control terminals of the first initialization module and the second initialization module are connected to the second scan signal line. The first terminals of the first initialization module and the second initialization module are connected to the initialization signal line. The second terminal of the first initialization module is electrically connected to the control terminal of the driving module. The first initialization module is configured to initialize the driving module. The second terminal of the second initialization module is electrically connected to the first terminal of the light emitting module. The second initialization module is configured to initialize the light emitting module.

[0040] The threshold compensation module can perform threshold compensation on the driving module, avoiding the change of the driving current caused by the fluctuation of the threshold voltage of the driving module, making the driving current more stable.

[0041] According to another aspect of the present invention, a display panel is provided. The display panel includes the pixel driving circuit according to any embodiment of the present invention.

[0042] The technical solution of the embodiment of the present invention electrically connects the compensation module to the first terminal of the light emitting module. During the light emitting stage, the compensation module acquires the potential of the first terminal of the light emitting module. When the compensation module determines that the potential of the first terminal of the light emitting module is less than the first power signal, the compensation module compensates the potential of the first terminal of the light emitting module, increasing the potential of the first terminal of the light emitting module to make it close to the first power signal. The voltage drop of the first power signal line is reduced, resulting in less difference in the first power signals received by the pixel driving circuits at different positions on the display panel. When the pixel driving circuits generate driving currents based on the first power signal and the data signal, the difference in the driving currents generated by the pixel driving circuits at different positions can be reduced. Furthermore, the display uniformity when the pixel driving circuits at different positions drive the light emitting module to emit light can be improved, enhancing the effect of the display panel. The technical solution of the embodiment of the present invention solves the problem of poor display uniformity of the display panel and improves the display uniformity of the display panel.

[0043] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 is a schematic diagram showing the relationship between the first power supply signal voltage value and the length of the first power supply signal line in the prior art;

[0046] Figure 2 is a schematic structural diagram of a pixel driving circuit provided by an embodiment of the present invention;

[0047] Figure 3 is a schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0048] Figure 4 is a schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0049] Figure 5 is a schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0050] Figure 6 is a schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0051] Figure 7 is a schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0052] Figure 8 is a schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0053] Figure 9 is a timing diagram of a pixel driving circuit provided by an embodiment of the present invention;

[0054] Figure 10 is a schematic structural diagram of a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] To enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0056] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the term "comprising" and any deformation thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0057] Figure 1 is a schematic diagram of the relationship between the voltage value of the first power supply signal and the length of the first power supply signal line in the prior art. The first power supply signal line provides the first power supply signal for the pixel driving circuit. The first power supply signal is, for example, a positive voltage signal. When the first power supply signal line extends from one end of the display panel to each pixel driving circuit, due to the long wiring, a certain voltage drop will occur. Refer to Figure 1 , the abscissa represents the length of the first power supply signal line, the ordinate represents the voltage value of the first power supply signal. Curve ① represents the relationship curve between the voltage value of the first power supply signal and the length of the first power supply signal line when the resistance of the first power supply signal line is relatively low; Curve ② represents the relationship curve between the voltage value of the first power supply signal and the length of the first power supply signal line when the resistance of the first power supply signal line is medium; Curve ③ represents the relationship curve between the voltage value of the first power supply signal and the length of the first power supply signal line when the resistance of the first power supply signal line is relatively high. It can be seen from Curve ①, Curve ② and Curve ③ that when the wiring length of the first power supply signal line is different, the voltage drop of the first power supply signal is different; the longer the first power supply signal line, the greater the voltage drop of the first power supply signal, and the smaller the voltage value of the first power supply signal obtained by the pixel driving circuit; Therefore, when the first power supply signal line extends from one end of the display panel to each pixel driving circuit, the wiring lengths to different pixel driving circuits are different, and the voltage drops are different, resulting in different voltage values reaching different pixel driving circuits, that is, different voltage values are provided for different pixel driving circuits, thereby reducing the brightness uniformity of the display panel.

[0058] In view of the above problems, an embodiment of the present invention provides a pixel driving circuit. Figure 2 FIG. Figure 2 is a schematic structural diagram of a pixel driving circuit provided by an embodiment of the present invention. Referring to Figure 2 , the pixel driving circuit includes: a driving module 101, a data writing module 102, a storage module 103, a light emitting module 104, and a compensation module 105; the data writing module 102 is connected between the driving module 101 and a data signal line Data, and the data writing module 102 is configured to provide a data signal Vdata for the driving module 101 during a data writing stage; the storage module 103 is connected between a first power signal line VDD and the driving module 101, and the storage module 103 is configured to store the data signal Vdata; the driving module 101 is connected between the first power signal line VDD and a first end of the light emitting module 104, and the driving module 101 is configured to generate a driving current according to the data signal Vdata during a light emitting stage, a second end of the light emitting module 104 is connected to a second power signal line VSS, and the light emitting module 104 is configured to emit light in response to the driving current; the compensation module 105 is electrically connected to the first end of the light emitting module 104, and the compensation module 105 is configured to compensate the potential of the first end N1 of the light emitting module 104 when the potential of the first end N1 of the light emitting module 104 is less than a first power signal provided by the first power signal line VDD.

[0059] Among them, the data signal line can provide the data signal Vdata, the first power signal line VDD can provide a first power signal, the second power signal line VSS can provide a second power signal, the first power signal is, for example, a positive voltage signal, and the second power signal is, for example, a negative voltage signal; the data writing module 102 can write the data signal Vdata provided by the data signal line Data into the driving module 101, the driving module 101 can generate a driving current according to the data signal Vdata and the first power signal, the light emitting module 104 includes, for example, an Organic Light Emitting Diode (OLED), and the light emitting module 104 can emit light in response to the driving current, so as to display a to-be-displayed brightness.

[0060] Specifically, during the data writing stage, the data writing module 102 writes the data signal Vdata into the driving module 101; the storage module 103 can store the data signal Vdata, so as to maintain the potential of the driving module 101.

[0061] During the light-emitting stage, the driving module 101 can generate a driving current according to the data signal Vdata and the first power supply signal, and the light-emitting module 104 emits light in response to the driving current. At the same time, the compensation module 105 can obtain the potential of the first terminal N1 of the light-emitting module 104. When the compensation module 105 determines that the potential of the first terminal N1 of the light-emitting module 104 is less than the first power supply signal provided by the first power supply signal line VDD, the compensation module 105 compensates the potential of the first terminal N1 of the light-emitting module 104, raises the potential of the first terminal N1 of the light-emitting module 104, makes the potential of the first terminal N1 of the light-emitting module 104 close to the first power supply signal, reduces the difference in the first power supply signals received by the pixel driving circuits at different positions on the display panel caused by the voltage drop of the first power supply signal line VDD, so that when the pixel driving circuits generate driving currents according to the first power supply signal and the data signal, the difference in the driving currents generated by the pixel driving circuits at different positions can be reduced, and further the display uniformity when the pixel driving circuits at different positions drive the light-emitting module 104 to emit light can be improved, and the effect of the display panel can be improved.

[0062] The technical solution of this embodiment electrically connects the compensation module to the first terminal of the light-emitting module. During the light-emitting stage, the compensation module obtains the potential of the first terminal of the light-emitting module. When the compensation module determines that the potential of the first terminal of the light-emitting module is less than the first power supply signal, the compensation module compensates the potential of the first terminal of the light-emitting module, raises the potential of the first terminal of the light-emitting module, and makes the potential of the first terminal of the light-emitting module close to the first power supply signal; reduces the difference in the first power supply signals received by the pixel driving circuits at different positions on the display panel due to the voltage drop of the first power supply signal line, so that when the pixel driving circuits generate driving currents according to the first power supply signal and the data signal, the difference in the driving currents generated by the pixel driving circuits at different positions can be reduced, and further the display uniformity when different pixel driving circuits drive the light-emitting module to emit light can be improved, and the effect of the display panel can be improved. The technical solution of this embodiment solves the problem of poor display uniformity of the display panel and improves the display uniformity of the display panel.

[0063] Figure 3 is a schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention. Optionally, refer to Figure 3, the compensation module 105 includes a first transistor T1; the control terminal of the data writing module 102 is connected to the first scan signal line S1, the first terminal of the data writing module 102 is connected to the data signal line Data, and the second terminal of the data writing module 102 is electrically connected to the control terminal of the driving module 101; the first terminal of the storage module 103 is connected to the first power signal line VDD, and the second terminal of the storage module 103 is electrically connected to the control terminal of the driving module 101; the first terminal of the driving module 101 is connected to the first power signal line VDD, and the second terminal of the driving module 101 is electrically connected to the first terminal of the light emitting module 104; the control terminal of the first transistor T1 is connected to the control signal line K1, the first terminal of the first transistor T1 is electrically connected to the second terminal N2 of the driving module 101, and the second terminal of the first transistor T1 is electrically connected to the first terminal N1 of the light emitting module 104.

[0064] Among them, the first scan signal line S1 can provide a first scan signal, and the first scan signal can be used to control the data writing module 102 to conduct or turn off; the control signal line K1 can provide a control signal, and the first transistor T1 can conduct or turn off according to the control signal.

[0065] Specifically, in the data writing stage, the first scan signal provided by the first scan signal line S1 controls the data writing module 102 to conduct, and the data writing module 102 writes the data signal Vdata to the control terminal of the driving module 101; the storage module 103 can store the data signal Vdata, so as to maintain the potential of the control terminal of the driving module 101.

[0066] In the light emitting stage, the driving module 101 can generate a driving current according to the data signal Vdata and the first power signal, and the light emitting module 104 emits light in response to the driving current. At the same time, the control signal provided by the control signal line K1 is, for example, a high-level signal, and the high-level signal is, for example, equal to the first power signal. The first transistor T1 obtains the potential of the first terminal N1 of the light emitting module 104. When the first transistor T1 determines that the potential of the first terminal N1 of the light emitting module 104 is less than the potential of the control terminal of the first transistor T1, that is, when the potential of the first terminal N1 of the light emitting module 104 is less than the first power signal, the first transistor T1 conducts, and the first transistor T1 will compensate the potential of the first terminal N1 of the light emitting module 104, which can increase the potential of the first terminal N1 of the light emitting module 104 and make the potential of the first terminal N1 of the light emitting module 104 close to the first power signal; reduce the difference in the first power signal received by the pixel driving circuits at different positions on the display panel caused by the voltage drop of the first power signal line VDD, so that when the pixel driving circuits generate driving current according to the first power signal and the data signal, the difference in the driving current generated by the pixel driving circuits at different positions can be reduced, and further, the display uniformity when different pixel driving circuits drive the light emitting module 104 to emit light can be improved, and the effect of the display panel can be improved.

[0067] Optionally, referring to Figure 3 , the first transistor T1 is an N-type transistor; the gate of the N-type transistor is the control terminal of the first transistor T1, the first pole of the N-type transistor is the first terminal of the first transistor T1, and the second pole of the N-type transistor is the second terminal of the first transistor T1.

[0068] Specifically, the first pole of the N-type transistor is the drain, and the second pole of the N-type transistor is the source; or, the first pole of the N-type transistor is the source, and the second pole of the N-type transistor is the drain.

[0069] Exemplarily, the first pole of the N-type transistor is the drain, and the second pole of the N-type transistor is the source.

[0070] Continuing to refer to Figure 3 , the driving module 101 may include a second transistor T2. The control terminal of the second transistor T2 is the control terminal of the driving module 101. The first terminal of the second transistor T2 is the first terminal of the driving module 101. The second terminal of the second transistor T2 is the second terminal of the driving module 101. The data writing module 102 includes a third transistor T3. The control terminal of the third transistor T3 is the control terminal of the data writing module 102. The first terminal of the third transistor T3 is the first terminal of the data writing module 102. The second terminal of the third transistor T3 is the second terminal of the data writing module 102. The storage module 103 includes a second capacitor C2. The first pole of the second capacitor C2 is the first terminal of the storage module 103. The second pole of the second capacitor C2 is the second terminal of the storage module 103. The light emitting module 104 includes a light emitting diode D1. The anode of the light emitting diode D1 is the first terminal of the light emitting module 104. The cathode of the light emitting diode D1 is the second terminal of the light emitting module 104. Exemplarily, the second transistor T2 and the third transistor T3 may be P-type transistors.

[0071] In the data writing stage, the third transistor T3 writes the data signal Vdata to the control terminal of the second transistor T2, and the second capacitor C2 can store the data signal Vdata, so as to maintain the potential of the control terminal of the second transistor T2.

[0072] During the light-emitting stage, the control signal is, for example, a high-level signal. The high-level signal is, for example, equal to the first power supply signal. The potential of the gate of the N-type transistor is the first power supply signal. The initial potentials of the drain and source of the N-type transistor are both V01, where V01 is the potential of the first power supply signal received by the pixel driving circuit after the conduction voltage drop of the driving module 101. When the potential of the source of the N-type transistor is less than the potential of its gate, the N-type transistor will conduct. And the potential of the drain of the N-type transistor is greater than the potential of its source. The potential of the drain of the N-type transistor is V01 + Vth. Then the drain of the N-type transistor will raise the potential of its source, thereby realizing the increase of the potential of the anode of the light-emitting diode D1, realizing the compensation of the potential of the anode of the light-emitting diode D1, making the potential of the anode of the light-emitting diode D1 close to the first power supply signal; reducing the difference in the first power supply signal received by the pixel driving circuits at different positions on the display panel caused by the voltage drop of the first power supply signal line VDD, so that when the pixel driving circuit generates a driving current according to the first power supply signal and the data signal, the difference in the driving current generated by the pixel driving circuits at different positions can be reduced, and further the display uniformity when different pixel driving circuits drive the light-emitting diode D1 to emit light can be improved, and the effect of the display panel can be improved.

[0073] Alternatively, the first pole of the N-type transistor is the source, and the second pole of the N-type transistor is the drain; during the data writing stage, the third transistor T3 writes the data signal Vdata into the control terminal of the second transistor T2, and the second capacitor C2 can store the data signal Vdata, thereby maintaining the potential of the control terminal of the second transistor T2. During the light-emitting stage, the control signal is, for example, a high-level signal. The high-level signal is, for example, equal to the first power supply signal. The potential of the gate of the N-type transistor is the first power supply signal. The initial potentials of the drain and source of the N-type transistor are both V01. The potential of the source of the N-type transistor is less than the potential of its gate, and the N-type transistor will conduct. And the potential of the drain of the N-type transistor is greater than the potential of its source. The potential of the drain of the N-type transistor is V01 + Vth. Then the potential of the anode of the light-emitting diode D1 is V01 + Vth, thereby realizing the increase of the potential of the anode of the light-emitting diode D1, and directly compensating the potential of the anode of the light-emitting diode D1, making the potential of the anode of the light-emitting diode D1 close to the first power supply signal; reducing the difference in the first power supply signal received by the pixel driving circuits at different positions on the display panel caused by the voltage drop of the first power supply signal line VDD, so that when the pixel driving circuit generates a driving current according to the first power supply signal and the data signal, the difference in the driving current generated by the pixel driving circuits at different positions can be reduced, and further the display uniformity when different pixel driving circuits drive the light-emitting diode D1 to emit light can be improved, and the effect of the display panel can be improved.

[0074] Figure 4 is a schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention.Figure 5 is another schematic structural diagram of a pixel driving circuit provided by an embodiment of the present invention. Optionally, referring to Figure 4 , the first power supply signal line VDD is multiplexed as the control signal line K1, or, referring to Figure 5 , the first scanning signal line S1 is multiplexed as the control signal line K1.

[0075] Specifically, the first power supply signal line VDD can be multiplexed as the control signal line K1. Then, in the light emitting stage, the potential of the gate of the N-type transistor is a high-level signal, and the high-level signal is, for example, the first power supply signal. When the source potential of the N-type transistor is less than the first power supply signal, the N-type transistor is turned on, and the drain potential of the N-type transistor is V01 + Vth, compensating the first end of the light emitting module 104.

[0076] Or, the data writing module 102 is turned on by a low-level signal, for example. Then, in the light emitting stage, the first scanning signal is a high level, and the high level is, for example, equal to the first power supply signal. Then, the first scanning signal line S1 can be multiplexed as the control signal line K1, such that in the light emitting stage, the potential of the gate of the N-type transistor is the first power supply signal. When the source potential of the N-type transistor is less than the first power supply signal, the N-type transistor is turned on, and the drain potential of the N-type transistor is V01 + Vth, compensating the first end of the light emitting module 104.

[0077] Figure 6 is another schematic structural diagram of a pixel driving circuit provided by an embodiment of the present invention. Optionally, referring to Figure 6 , the first transistor is a P-type transistor; the gate of the P-type transistor is the control end of the first transistor T1, the first pole of the P-type transistor is the first end of the first transistor T1, and the second pole of the P-type transistor is the second end of the first transistor T1.

[0078] Specifically, the first pole of the P-type transistor is the source, and the second pole of the P-type transistor is the drain; or, the first pole of the P-type transistor is the drain, and the second stage of the P-type transistor is the source.

[0079] Exemplarily, the first pole of the P-type transistor is the source electrode, and the second pole of the P-type transistor is the drain electrode; in the data writing stage, the third transistor T3 writes the data signal Vdata to the control terminal of the second transistor T2, and the second capacitor C2 can store the data signal Vdata, so as to maintain the potential of the control terminal of the second transistor T2. In the light emitting stage, the control signal is, for example, a low level signal, and the low level signal is, for example, equal to the second power supply signal. The potential of the gate of the P-type transistor is the second power supply signal, and the initial potentials of the drain and source of the P-type transistor are both V01. Since the potential of the gate of the P-type transistor is less than the potential of its source, the P-type transistor will conduct. And since the potential of the source of the P-type transistor is greater than the potential of its drain, and the potential of the source of the P-type transistor is V01+Vth, the source of the P-type transistor will raise the potential of its drain, thereby realizing the increase of the anode potential of the light emitting diode D1, realizing the compensation of the anode potential of the light emitting diode D1, and making the anode potential of the light emitting diode D1 close to the first power supply signal; reducing the difference in the first power supply signal received by the pixel driving circuits at different positions on the display panel caused by the voltage drop of the first power supply signal line VDD, so that when the pixel driving circuits generate driving current according to the first power supply signal and the data signal, the difference in the driving current generated by different pixel driving circuits can be reduced, and further the display uniformity when different pixel driving circuits drive the light emitting diode D1 to emit light can be improved, and the effect of the display panel can be improved.

[0080] Alternatively, the first pole of the P-type transistor is the drain electrode, and the second pole of the P-type transistor is the source electrode; in the data writing stage, the third transistor T3 writes the data signal Vdata to the control terminal of the second transistor T2, and the second capacitor C2 can store the data signal Vdata, so as to maintain the potential of the control terminal of the second transistor T2. In the light emitting stage, the control signal is, for example, a low level signal, and the low level signal is, for example, equal to the second power supply signal. The potential of the gate of the P-type transistor is the second power supply signal, and the initial potentials of the drain and source of the P-type transistor are both V01. Since the potential of the gate of the P-type transistor is less than the potential of its source, the P-type transistor will conduct. And since the potential of the source of the P-type transistor is greater than the potential of its drain, and the potential of the source of the P-type transistor is V01+Vth, the potential of the first end of the light emitting module 104 is V01+Vth, thereby realizing the increase of the anode potential of the light emitting diode D1, directly compensating the anode potential of the light emitting diode D1, and making the anode potential of the light emitting diode D1 close to the first power supply signal; reducing the difference in the first power supply signal received by the pixel driving circuits at different positions on the display panel caused by the voltage drop of the first power supply signal line VDD, so that when the pixel driving circuits generate driving current according to the first power supply signal and the data signal, the difference in the driving current generated by different pixel driving circuits can be reduced, and further the display uniformity when different position pixel driving circuits drive the light emitting diode D1 to emit light can be improved, and the effect of the display panel can be improved.

[0081] Optionally, continuing to refer to Figure 6 , the second power supply signal line VSS is multiplexed as the control signal line K1.

[0082] Specifically, the second power supply signal line VSS can be multiplexed as the control signal line K1. Then, during the light-emitting stage, the potential of the gate of the P-type transistor is the second power supply signal, the potential of the gate of the P-type transistor is less than the potential of its source, the P-type transistor is turned on, and the potential of the source of the P-type transistor is V01 + Vth, compensating the first end of the light-emitting module 104.

[0083] Figure 7 is a schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention. Optionally, referring to Figure 7 , the pixel driving circuit further includes a first light-emitting control module 106; the compensation module 105 includes a first transistor T1; the control end of the data writing module 102 is connected to the first scan signal line S1, the first end of the data writing module 102 is connected to the data signal line Data, and the second end of the data writing module 102 is electrically connected to the first end of the driving module 101; the first end of the storage module 103 is connected to the first power supply signal line VDD, and the second end of the storage module 103 is electrically connected to the control end of the driving module 101; the first end of the driving module 101 is connected to the first power supply signal line VDD; the control end of the first light-emitting control module 106 is connected to the enable signal line EM, the first end of the first light-emitting control module 106 is electrically connected to the second end of the driving module 101, and the second end of the first light-emitting control module 106 is electrically connected to the first end of the light-emitting module 104; the control end of the first transistor T1 is connected to the control signal line K1, the first end of the first transistor T1 is electrically connected to the second end N3 of the first light-emitting control module 106, and the second end of the first transistor T1 is electrically connected to the first end N1 of the light-emitting module 104.

[0084] Among them, the enable signal line EM can provide an enable signal, and the enable signal can control the first light-emitting control module 106 to be turned on or off. Exemplarily, the first light-emitting control module 106 includes a fourth transistor T4. The control end of the fourth transistor T4 is the control end of the first light-emitting control module 106, the first end of the fourth transistor T4 is the first end of the first light-emitting control module 106, and the second end of the fourth transistor T4 is the second end of the first light-emitting control module 106. When the fourth transistor T4 is a P-type transistor, when the enable signal is at a low level, the fourth transistor T4 is controlled to be turned on, and when the enable signal is at a high level, the fourth transistor T4 is controlled to be turned off.

[0085] Specifically, in the data writing stage, the first scan signal provided by the first scan signal line S1 controls the data writing module 102 to conduct. The data writing module 102 writes the data signal Vdata to the control end of the driving module 101 through the first end of the driving module 101. The storage module 103 can store the data signal Vdata, thereby maintaining the potential of the control end of the driving module 101.

[0086] In the light emitting stage, the driving module 101 can generate a driving current according to the data signal Vdata and the first power supply signal, and the light emitting module 104 emits light in response to the driving current. At the same time, the control signal provided by the control signal line K1, for example, is equal to the first power supply signal. The first transistor T1 acquires the potential of the first end N1 of the light emitting module 104. When the first transistor T1 determines that the potential of the first end N1 of the light emitting module 104 is less than the potential of the control end of the first transistor T1, that is, when the potential of the first end N1 of the light emitting module 104 is less than the first power supply signal, the first transistor T1 conducts. The first transistor T1 will compensate the potential of the first end N1 of the light emitting module 104, which can increase the potential of the first end N1 of the light emitting module 104 and make the potential of the first end N1 of the light emitting module 104 close to the first power supply signal; it reduces the difference in the first power supply signal received by the pixel driving circuits at different positions on the display panel caused by the voltage drop of the first power supply signal line VDD. When the pixel driving circuits generate driving currents according to the first power supply signal and the data signal, it can reduce the difference in the driving currents generated by the pixel driving circuits at different positions, and further improve the display uniformity when the pixel driving circuits at different positions drive the light emitting module 104 to emit light, and improve the effect of the display panel.

[0087] Optionally, referring to Figure 7 , the first transistor T1 is an N-type transistor; the gate of the N-type transistor is the control end of the first transistor T1, the first pole of the N-type transistor is the first end of the first transistor T1, and the second pole of the N-type transistor is the second end of the first transistor T1.

[0088] Specifically, the first pole of the N-type transistor is the drain, and the second pole of the N-type transistor is the source; or, the first pole of the N-type transistor is the source, and the second pole of the N-type transistor is the drain.

[0089] Exemplarily, the first pole of the N-type transistor is the drain, and the second pole of the N-type transistor is the source; in the data writing stage, the third transistor T3 writes the data signal Vdata to the control terminal of the second transistor T2, and the second capacitor C2 can store the data signal Vdata, so as to maintain the potential of the control terminal of the second transistor T2. In the light emitting stage, the control signal is, for example, a high-level signal, the high-level signal is, for example, equal to the first power supply signal, the potential of the gate of the N-type transistor is the first power supply signal, the initial potentials of the drain and the source of the N-type transistor are both V01, the potential of the source of the N-type transistor is less than the potential of its gate, the N-type transistor will conduct, and the potential of the drain of the N-type transistor is greater than the potential of its source, the potential of the drain of the N-type transistor is V01 + Vth, then the drain of the N-type transistor will raise the potential of its source, so as to realize raising the potential of the anode of the light emitting diode D1, realize compensating the potential of the anode of the light emitting diode D1, and make the anode potential of the light emitting diode D1 close to the first power supply signal; reduce the difference in the first power supply signal received by the pixel driving circuits at different positions on the display panel caused by the voltage drop of the first power supply signal line VDD, so that when the pixel driving circuit generates a driving current according to the first power supply signal and the data signal, the difference in the driving current generated by the pixel driving circuits at different positions can be reduced, and further the display uniformity when the pixel driving circuits at different positions drive the light emitting diode D1 to emit light can be improved, and the effect of the display panel can be improved.

[0090] Alternatively, the first electrode of the N-type transistor is the source electrode, and the second electrode of the N-type transistor is the drain electrode; in the data writing stage, the third transistor T3 writes the data signal Vdata to the control terminal of the second transistor T2, and the second capacitor C2 can store the data signal Vdata, so as to maintain the potential of the control terminal of the second transistor T2. In the light emitting stage, the control signal is, for example, a high-level signal, the high-level signal is, for example, equal to the first power supply signal, the potential of the gate of the N-type transistor is the first power supply signal, the initial potentials of the drain and source of the N-type transistor are both V01, the potential of the source of the N-type transistor is less than the potential of its gate, the N-type transistor will conduct, and the potential of the drain of the N-type transistor is greater than the potential of its source, the potential of the drain of the N-type transistor is V01 + Vth, then the potential of the first end of the light emitting module 104 is V01 + Vth, so as to realize increasing the potential of the anode of the light emitting diode D1, and the potential of the anode of the light emitting diode D1 can be directly compensated, so that the potential of the anode of the light emitting diode D1 is close to the first power supply signal; the difference in the first power supply signal received by the pixel driving circuits at different positions on the display panel caused by the voltage drop of the first power supply signal line VDD is reduced, so that when the pixel driving circuit generates a driving current according to the first power supply signal and the data signal, the difference in the driving current generated by the pixel driving circuits at different positions can be reduced, and further, the display uniformity when the pixel driving circuits at different positions drive the light emitting diode D1 to emit light can be improved, and the effect of the display panel can be improved.

[0091] Figure 8 is a schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention. Optionally, referring to Figure 8 , the first transistor is a P-type transistor; the gate of the P-type transistor is the control terminal of the first transistor T1, the first electrode of the P-type transistor is the first end of the first transistor T1, and the second electrode of the P-type transistor is the second end of the first transistor T1.

[0092] Specifically, the first electrode of the P-type transistor is the source electrode, and the second electrode of the P-type transistor is the drain electrode; or, the first electrode of the P-type transistor is the drain electrode, and the second stage of the P-type transistor is the source electrode.

[0093] Exemplarily, the first pole of the P-type transistor is the source electrode, and the second pole of the P-type transistor is the drain electrode; in the data writing stage, the third transistor T3 writes the data signal Vdata to the control terminal of the second transistor T2, and the second capacitor C2 can store the data signal Vdata, so as to maintain the potential of the control terminal of the second transistor T2. In the light emitting stage, the control signal is, for example, a low-level signal, and the low-level signal is, for example, equal to the second power supply signal. The potential of the gate of the P-type transistor is the second power supply signal. The initial potentials of the drain and source of the P-type transistor are both V01. The potential of the gate of the P-type transistor is less than the potential of its source electrode, and the P-type transistor will conduct. The potential of the source of the P-type transistor is greater than the potential of its drain electrode, and the potential of the source of the P-type transistor is V01+Vth. Then, the source of the P-type transistor will raise the potential of its drain electrode, so as to increase the potential of the anode of the light emitting diode D1, realize the compensation of the potential of the anode of the light emitting diode D1, and make the potential of the anode of the light emitting diode D1 close to the first power supply signal; reduce the difference in the first power supply signal received by the pixel driving circuits at different positions on the display panel caused by the voltage drop of the first power supply signal line VDD, so that when the pixel driving circuits generate driving current according to the first power supply signal and the data signal, the difference in the driving current generated by the pixel driving circuits at different positions can be reduced, and further, the display uniformity when different pixel driving circuits drive the light emitting diode D1 to emit light can be improved, and the effect of the display panel can be improved.

[0094] Alternatively, the first pole of the P-type transistor is the drain electrode, and the second pole of the P-type transistor is the source electrode; in the data writing stage, the third transistor T3 writes the data signal Vdata to the control terminal of the second transistor T2, and the second capacitor C2 can store the data signal Vdata, so as to maintain the potential of the control terminal of the second transistor T2. In the light emitting stage, the control signal is, for example, a low-level signal, and the low-level signal is, for example, equal to the second power supply signal. The potential of the gate of the P-type transistor is the second power supply signal. The initial potentials of the drain and source of the P-type transistor are both V01. The potential of the gate of the P-type transistor is less than the potential of its source electrode, and the P-type transistor will conduct. The potential of the source of the P-type transistor is greater than the potential of its drain electrode, and the potential of the source of the P-type transistor is V01+Vth. Then, the potential of the anode of the light emitting diode D1 is V01+Vth, so as to increase the potential of the first end of the light emitting module 104, directly compensate the potential of the anode of the light emitting diode D1, and make the potential of the anode of the light emitting diode D1 close to the first power supply signal; reduce the difference in the first power supply signal received by the pixel driving circuits at different positions on the display panel caused by the voltage drop of the first power supply signal line VDD, so that when the pixel driving circuits generate driving current according to the first power supply signal and the data signal, the difference in the driving current generated by the pixel driving circuits at different positions can be reduced, and further, the display uniformity when different pixel driving circuits drive the light emitting diode D1 to emit light can be improved, and the effect of the display panel can be improved.

[0095] Optionally, referring to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 or Figure 8 , the compensation module 105 further includes a first capacitor C1; a first end of the first capacitor C1 is connected to a control signal line K1, and a second end of the first capacitor C1 is electrically connected to a control end of the first transistor T1.

[0096] Specifically, the control signal line K1 charges the first capacitor C1. After being fully charged, the first capacitor C1 starts to discharge. Then, the voltage of the discharge of the first capacitor C1 can control the potential of the control end of the first transistor T1, thereby controlling the opening degree of the first transistor T1. Different opening degrees result in different voltages compensated by the first transistor T1 to the first end of the light-emitting module 104. Exemplarily, when the first transistor T1 is an N-type transistor, the initial voltage of the first end of the light-emitting module 104 of a pixel driving circuit in the display panel is, for example, 2.8V. When the first capacitor C1 discharges and the potential of the control end of the first transistor T1 is greater than 2.8V, the first transistor T1 will conduct. Assuming that the potential of the control end of the first transistor T1 is 3V, the first transistor T1 is fully conductive; after the first capacitor C1 discharges to 3V, even if the first capacitor C1 continues to discharge, the voltage compensated by the first transistor T1 to the light-emitting module 104 remains unchanged; but if the initial voltage of the first end of the light-emitting module 104 of another pixel driving circuit is 3V and the first capacitor C1 continues to discharge to the first transistor T1, it will cause the first transistor T1 to continue to open and continue to compensate, so that the voltage compensated by the first transistor T1 can meet the requirements of different pixel driving circuits, which is beneficial to improving the display uniformity of the display panel.

[0097] Optionally, continuing to refer to Figure 7 or Figure 8 , the pixel driving circuit further includes: a threshold compensation module 107; a control end of the threshold compensation module 107 is connected to a first scan signal line S1, a first end of the threshold compensation module 107 is electrically connected to a second end of the driving module 101, and a second end of the threshold compensation module 107 is electrically connected to a control end of the driving module 101. The threshold compensation module 107 is used to capture the threshold voltage of the driving module 101 to the control end of the driving module 101.

[0098] Wherein, the threshold compensation module 107 includes a fifth transistor T5. A control end of the fifth transistor T5 is the control end of the threshold compensation module 107, a first end of the fifth transistor T5 is the first end of the threshold compensation module 107, and a second end of the fifth transistor T5 is the second end of the threshold compensation module 107.

[0099] Specifically, the first scan signal provided by the first scan signal line S1 can control whether the threshold compensation module 107 is turned on. During the data writing phase, the first scan signal controls the threshold compensation module 107 to be turned on. The threshold compensation module 107 can capture the threshold voltage of the driving module 101 to the control end of the driving module 101 to compensate the driving module 101, avoiding the change of the driving current caused by the fluctuation of the threshold voltage of the driving module 101, making the driving current more stable, and enabling the light-emitting module 104 to better display the to-be-displayed brightness.

[0100] Optionally, continuing to refer to Figure 7 or Figure 8 , the pixel driving circuit further includes: a second light-emitting control module 108, a first initialization module 109, and a second initialization module 110; the control end of the second light-emitting control module 108 is connected to the enable signal line EM, the first end of the second light-emitting control module 108 is connected to the first power signal line VDD, and the second end of the second light-emitting control module 108 is electrically connected to the first end of the driving module 101; the control ends of the first initialization module 109 and the second initialization module 110 are connected to the second scan signal line S2, the first ends of the first initialization module 109 and the second initialization module 110 are connected to the initialization signal line Vref, the second end of the first initialization module 109 is electrically connected to the control end of the driving module 101, and the first initialization module 109 is used to initialize the driving module 101; the second end of the second initialization module 110 is electrically connected to the first end of the light-emitting module 104, and the second initialization module 110 is used to initialize the light-emitting module 104.

[0101] Optionally, continuing to refer to Figure 7 or Figure 8 , the second light-emitting control module 108 includes a sixth transistor T6. The control end of the sixth transistor T6 is the control end of the second light-emitting control module 108, the first end of the sixth transistor T6 is the first end of the second light-emitting control module 108, and the second end of the sixth transistor T6 is the second end of the second light-emitting control module 108; the first initialization module 109 includes a seventh transistor T7. The control end of the seventh transistor T7 is the control end of the first initialization module 109, the first end of the seventh transistor T7 is the first end of the first initialization module 109, and the second end of the seventh transistor T7 is the second end of the first initialization module 109; the second initialization module 110 includes an eighth transistor T8. The control end of the eighth transistor T8 is the control end of the second initialization module 110, the first end of the eighth transistor T8 is the first end of the second initialization module 110, and the second end of the eighth transistor T8 is the second end of the second initialization module 110.

[0102] Optionally, the fifth transistor T5 is, for example, a double-gate transistor. The double-gate transistor can reduce the leakage current, thereby reducing the leakage current at the control terminal of the driving module 101, making the potential at the control terminal of the driving module 101 relatively stable; the seventh transistor T7 is, for example, a double-gate transistor, which can further reduce the leakage current at the control terminal of the driving module 101, enabling the driving module 101 to generate a stable driving current, and the light-emitting module 104 can emit light stably.

[0103] Figure 9 is a timing diagram of a pixel driving circuit provided by an embodiment of the present invention. Refer to Figure 9 , Scan1 is the first scan signal provided by the first scan signal line S1, Scan2 is the second scan signal provided by the second scan signal line S2, and E1 is the enable signal provided by the enable signal line EM.

[0104] Refer to Figure 7 and Figure 9 , in the initialization stage t0, the second scan signal Scan2 provided by the second scan signal line S2 is at a low level, the seventh transistor T7 and the eighth transistor T8 are turned on, the seventh transistor T7 initializes the control terminal of the second transistor T2, and the eighth transistor T8 initializes the anode of the light-emitting diode D1.

[0105] In the data writing stage t1, the first scan signal Scan1 provided by the first scan signal line S1 is at a low level, the third transistor T3 and the fifth transistor T5 are turned on, the third transistor T3 writes the data signal Vdata provided by the data signal line Data through the first terminal of the second transistor T2 to the control terminal of the second transistor T2. The second capacitor C2 can store the data signal Vdata, thereby maintaining the potential at the control terminal of the second transistor T2; at the same time, the fifth transistor T5 captures the threshold voltage of the second transistor T2 to the control terminal of the second transistor T2 to achieve threshold compensation.

[0106] During the light-emitting stage t2, the enable signal E1 provided by the enable signal line EM is at a low level, and the fourth transistor T4 and the sixth transistor T6 are turned on; the first scan signal Scan1 provided by the first scan signal line S1 is at a high level, and the high-level signal is, for example, equal to the first power supply signal; the second transistor T2 can generate a driving current according to the data signal Vdata and the first power supply signal, and the light-emitting diode D1 emits light in response to the driving current. At the same time, the first transistor T1 can obtain the anode potential of the light-emitting diode D1. When the first transistor T1 determines that the anode potential of the light-emitting diode D1 is less than the first power supply signal provided by the first power supply signal line VDD, the first transistor T1 compensates the potential of the first end N1 of the light-emitting diode D1, which can increase the anode potential of the light-emitting diode D1, making the anode potential of the light-emitting diode D1 close to the first power supply signal; reducing the difference in the first power supply signal received by the pixel driving circuits at different positions on the display panel caused by the voltage drop of the first power supply signal line VDD, so that when the pixel driving circuit generates a driving current according to the first power supply signal and the data signal, the difference in the driving current generated by the pixel driving circuits at different positions can be reduced, and further the display uniformity when the pixel driving circuits at different positions drive the light-emitting diode D1 to emit light can be improved, and the effect of the display panel can be improved.

[0107] Moreover, the first transistor T1 can compensate the anode potential of the light-emitting diode D1 in all the pixel driving circuits in the display panel, making the anode potential of the light-emitting diode D1 in each pixel driving circuit close to the first power supply signal, thereby improving the display uniformity of the display panel.

[0108] It should be noted that Figure 7 and Figure 8 only show the case where the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, and the eighth transistor T8 are P-type transistors, but it is not limited; Figure 9 only show the case where the first transistor T1 is turned on by a high-level signal and the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, and the eighth transistor T8 are turned on by a low-level signal, but it is not limited.

[0109] The technical solution of this embodiment also provides a display panel, and the display panel includes the pixel driving circuit provided by any of the above embodiments. Figure 10 It is a schematic structural diagram of a display panel provided by an embodiment of the present invention. Referring to Figure 10 , the display panel can be applied to mobile phones, tablets, monitors, smart watches, MP3 players, MP4 players, or other wearable devices, etc. Because it includes the pixel driving circuit provided by any embodiment of the present invention, it also has the same beneficial effects, which will not be elaborated here.

[0110] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pixel driving circuit, characterized in that, Comprising: A driving module, a data writing module, a storage module, a light emitting module and a compensation module; The data writing module is connected between the driving module and a data signal line, and the data writing module is configured to provide a data signal for the driving module during a data writing stage; The storage module is connected between a first power signal line and the driving module, and the storage module is configured to store the data signal; The driving module is connected between the first power signal line and a first end of the light emitting module, and the driving module is configured to generate a driving current according to the data signal during a light emitting stage, a second end of the light emitting module is connected to a second power signal line, and the light emitting module is configured to emit light in response to the driving current; The compensation module is electrically connected to the first end of the light emitting module, and the compensation module is configured to compensate the potential of the first end of the light emitting module when the potential of the first end of the light emitting module is less than a first power signal provided by the first power signal line; The compensation module includes a first transistor; a first end of the driving module is connected to the first power signal line; a control end of the first transistor is connected to a control signal line; a second end of the first transistor is electrically connected to the first end of the light emitting module; A second end of the driving module is electrically connected to the first end of the light emitting module; a first end of the first transistor is electrically connected to the second end of the driving module; alternatively, the pixel driving circuit further includes a first light emitting control module, a first end of the first light emitting control module is electrically connected to the second end of the driving module, a second end of the first light emitting control module is electrically connected to the first end of the light emitting module; a first end of the first transistor is electrically connected to the second end of the first light emitting control module.

2. The pixel driving circuit according to claim 1, wherein A control end of the data writing module is connected to a first scanning signal line, a first end of the data writing module is connected to the data signal line, and a second end of the data writing module is electrically connected to a control end of the driving module; A first end of the storage module is connected to the first power signal line, and a second end of the storage module is electrically connected to the control end of the driving module.

3. The pixel driving circuit according to claim 1, wherein A control end of the data writing module is connected to a first scanning signal line, a first end of the data writing module is connected to the data signal line, and a second end of the data writing module is electrically connected to a first end of the driving module; A first end of the storage module is connected to the first power signal line, and a second end of the storage module is electrically connected to the control end of the driving module; A control end of the first light emitting control module is connected to an enable signal line.

4. The pixel driving circuit according to claim 2 or 3, wherein The first transistor is an N-type transistor; A gate of the N-type transistor is the control end of the first transistor, a first pole of the N-type transistor is the first end of the first transistor, and a second pole of the N-type transistor is the second end of the first transistor.

5. The pixel driving circuit according to claim 4, wherein The first power signal line is multiplexed as the control signal line, or the first scanning signal line is multiplexed as the control signal line.

6. The pixel driving circuit according to claim 2 or 3, wherein The first transistor is a P-type transistor; The gate of the P-type transistor is the control end of the first transistor, the first pole of the P-type transistor is the first end of the first transistor, and the second pole of the P-type transistor is the second end of the first transistor.

7. The pixel driving circuit according to claim 6, wherein The second power supply signal line is multiplexed as the control signal line.

8. The pixel driving circuit according to claim 1, wherein The compensation module further includes a first capacitor; The first end of the first capacitor is connected to the control signal line, and the second end of the first capacitor is electrically connected to the control end of the first transistor.

9. The pixel driving circuit according to claim 1 or 3, wherein It further includes: A threshold compensation module; The control end of the threshold compensation module is connected to the first scan signal line, the first end of the threshold compensation module is electrically connected to the second end of the driving module, the second end of the threshold compensation module is electrically connected to the control end of the driving module, and the threshold compensation module is used to capture the threshold voltage of the driving module to the control end of the driving module.

10. The pixel driving circuit according to claim 1 or 3, wherein The pixel driving circuit further includes: a second light emission control module, a first initialization module, and a second initialization module; the control end of the second light emission control module is connected to the enable signal line, the first end of the second light emission control module is connected to the first power supply signal line, and the second end of the second light emission control module is electrically connected to the first end of the driving module; the control ends of the first initialization module and the second initialization module are connected to the second scan signal line, the first ends of the first initialization module and the second initialization module are connected to the initialization signal line, the second end of the first initialization module is electrically connected to the control end of the driving module, and the first initialization module is used to initialize the driving module; the second end of the second initialization module is electrically connected to the first end of the light emitting module, and the second initialization module is used to initialize the light emitting module.

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

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