Pixel driving circuit, driving method of pixel driving circuit and display panel

Abstract

The present invention provides a pixel driving circuit, a driving method of the pixel driving circuit and a display panel. The pixel driving circuit includes a driving transistor, which is configured to generate a driving current through a signal received at a first control terminal during a light-emitting phase, and drive a light-emitting device through an output terminal electrically connected to the light-emitting device; an initialization module, which is configured to transmit a first initialization voltage to the first control terminal of the driving transistor during the initialization phase, and transmit a second initialization voltage to the output terminal of the driving transistor; a compensation module, which is electrically connected to the second control terminal, and is configured to adjust the potential of the second control terminal during the compensation phase to compensate for the threshold voltage of the driving transistor; wherein, during the compensation phase, the first initialization voltage is less than the second initialization voltage. The pixel driving circuit is capable of detecting the threshold voltage of the driving transistor, and then accurately compensating the threshold voltage of the driving transistor.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a pixel driving circuit, a driving method of the pixel driving circuit, and a display panel. Background Art

[0002] AMOLED (Active Matrix / Organic Light Emitting Diode) displays are currently popular displays and are widely used in mid-to-high-end display products. They have advantages over traditional LCD displays such as higher color gamut, wide viewing angle, contrast, and response time.

[0003] AMOLED displays use thin-film transistors to drive OLED devices to emit light through current. The Vth (threshold voltage) of the thin-film transistors actually produced is non-uniform, and its Vth will shift as the usage time increases, which will cause uneven display brightness and reduce the reliability of the display panel.

[0004] In the related art, the internal compensation circuit is divided into two types: source follower and diode connect. The diode connection method has higher compensation accuracy. However, when the driving thin film transistor is N-type, there is no compensation effect when the Vth is negatively offset to less than 0V. Therefore, when the driving thin film transistor is negatively offset, accurate compensation cannot be performed. Summary of the invention

[0005] Embodiments of the present invention provide a pixel driving circuit, a driving method of the pixel driving circuit and a display panel to solve the problem in the related art that accurate compensation cannot be performed when a driving thin film transistor has a negative offset.

[0006] To solve the above problem, a technical solution provided by an embodiment of the present invention is as follows:

[0007] A pixel driving circuit, the pixel driving circuit comprising:

[0008] a driving transistor, comprising an output terminal, an input terminal, a first control terminal and a second control terminal, configured to generate a driving current in a light emitting phase through a signal received by the first control terminal, and drive the light emitting device by electrically connecting the output terminal to the light emitting device;

[0009] an initialization module, configured to transmit a first initialization voltage to the first control terminal of the driving transistor and transmit a second initialization voltage to the output terminal of the driving transistor during an initialization phase;

[0010] a compensation module, electrically connected to the second control terminal, and configured to: adjust the potential of the second control terminal to compensate for the threshold voltage of the driving transistor;

[0011] Wherein, the first initialization voltage is smaller than the second initialization voltage.

[0012] In one embodiment, the initialization module includes:

[0013] a first initialization transistor, wherein an input terminal of the first initialization transistor is used to receive the first initialization voltage, an output terminal of the first initialization transistor is electrically connected to the first control terminal of the driving transistor, and a control terminal of the first initialization transistor is used to receive a sensing signal;

[0014] A second initialization transistor, wherein the input terminal of the second initialization transistor is used to receive the second initialization voltage, the output terminal of the second initialization transistor is electrically connected to the output terminal of the transistor, and the control terminal of the second initialization transistor is used to receive the sensing signal.

[0015] In one embodiment, the compensation module includes:

[0016] A compensation transistor, wherein the input terminal of the compensation transistor is electrically connected to the second control terminal of the driving transistor, the output terminal of the compensation transistor is electrically connected to the input terminal of the driving transistor, and the control terminal of the compensation transistor is used to receive the sensing signal.

[0017] In one embodiment, the compensation module further includes:

[0018] First Storage Capacitor The first storage capacitor is electrically connected to the second control terminal of the driving transistor and the output terminal of the driving transistor.

[0019] In one embodiment, the pixel driving circuit further includes:

[0020] A light emitting control module, comprising a light emitting control transistor, wherein an input end of the light emitting control transistor is used to receive a first power supply voltage, a control end of the light emitting control transistor is used to receive a light emitting control signal, and an output end of the light emitting control transistor is electrically connected to the input end of the driving transistor;

[0021] A data module, comprising a data transistor, wherein an input end of the data transistor is used to receive a data signal, an output end of the data transistor is electrically connected to the first control end of the driving transistor, and a control end of the data transistor is used to receive a scan signal;

[0022] A second storage capacitor is electrically connected to the first control terminal of the driving transistor and the output terminal of the driving transistor.

[0023] An embodiment of the present invention further provides a pixel driving circuit for driving a light-emitting device, comprising:

[0024] A driving transistor, comprising an output terminal, an input terminal, a first control terminal and a second control terminal, wherein the input terminal is electrically connected to the first power terminal, and the output terminal is electrically connected to the second power terminal through the light emitting device;

[0025] a light emitting control transistor, comprising a control terminal for receiving a light emitting control signal, an input terminal electrically connected to the second power terminal, and an output terminal electrically connected to the input terminal of the driving transistor;

[0026] a data transistor, comprising a control terminal for receiving a scan signal, an input terminal for receiving a data signal, and an output terminal electrically connected to the first control terminal of the driving transistor;

[0027] a first initialization transistor, comprising a control terminal for receiving a sensing signal, an input terminal for receiving a first initialization voltage, and an output terminal electrically connected to the first control terminal of the driving transistor;

[0028] a second initialization transistor, comprising a control terminal for receiving the sensing signal, an input terminal for receiving a second initialization voltage, and an output terminal electrically connected to the output terminal of the driving transistor;

[0029] a compensation transistor, comprising a control terminal for receiving the sensing signal, an input terminal electrically connected to the input terminal of the driving transistor, and an output terminal electrically connected to the second control terminal of the driving transistor;

[0030] a first storage capacitor including a first end electrically connected to the second control end of the driving transistor, and a second end electrically connected to the output end of the driving transistor; and

[0031] The second storage capacitor includes a first end electrically connected to the first control end of the driving transistor, and a second end electrically connected to the output end of the driving transistor.

[0032] An embodiment of the present invention further provides a driving method of a pixel driving circuit, the method comprising:

[0033] In the initialization phase and the compensation phase, controlling the initialization module to transmit the first initialization voltage to the first control terminal of the driving transistor and to transmit the second initialization voltage to the output terminal of the driving transistor;

[0034] In the compensation stage, controlling the compensation module to adjust the potential of the second control terminal to compensate for the threshold voltage of the driving transistor;

[0035] In the light emitting phase, the driving transistor is controlled to generate the driving current to drive the light emitting device.

[0036] In one embodiment, during the compensation stage, both the initialization module and the compensation module are turned on, and the compensation module makes the potentials of the input terminal and the second control terminal of the driving transistor the same.

[0037] In one embodiment, the initialization module and the compensation module receive the same control signal so as to be turned on and off simultaneously under the control of the same control signal.

[0038] An embodiment of the present invention further provides a display panel, comprising the pixel driving circuit as described in any one of the above embodiments.

[0039] In the pixel driving circuit provided by the embodiment of the present invention, during the compensation stage, a first initialization voltage and a second initialization voltage are respectively applied to the first control terminal of the driving transistor and the output terminal of the driving transistor, and the first initialization voltage is made smaller than the second initialization voltage, thereby applying a negative gate voltage to the driving transistor, so that when the compensation module compensates the driving transistor, the threshold voltage of the driving transistor can be accurately detected, thereby accurately compensating the threshold voltage of the driving transistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0041] Attached Figure 1 is a schematic diagram of a pixel driving circuit according to an embodiment of the present invention;

[0042] Attached Figure 2 is a timing diagram of a pixel driving circuit according to an embodiment of the present invention;

[0043] Attached Figure 3 It is a schematic diagram of the voltage change at point b of the present invention;

[0044] Attached Figure 4 is a schematic flow chart of a driving method of a pixel driving circuit of the present invention;

[0045] Attached Figure 5 It is a schematic flow chart of a driving method of a pixel driving circuit of the present invention. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0047] The threshold voltage of the driving transistor is often offset due to the manufacturing process or usage time. In the related art, it is compensated by internal compensation. The drain and gate of the driving transistor are connected through a switching transistor to form a diode structure. In the compensation stage, due to the conduction of the driving transistor, the gate potential of the driving transistor continues to decrease until Vgs = Vth = Vg-Vs, where Vgs is the voltage difference between the gate and source of the driving transistor, Vg is the voltage of the gate of the driving transistor, Vs is the voltage of the drain of the driving transistor, and Vth is the threshold voltage of the driving transistor. The threshold voltage is stored in the storage capacitor to complete the compensation. From the above, it can be seen that when the threshold voltage of the driving transistor is negatively biased to less than zero, the threshold voltage Vth of the driving transistor cannot be accurately detected.

[0048] This embodiment provides a pixel driving circuit to solve the problem in the internal compensation circuit that when the threshold voltage Vth of the driving transistor T1 is negatively biased to be less than zero, the threshold voltage Vth of the driving transistor T1 cannot be accurately detected.

[0049] like Figure 1 As shown, the pixel driving circuit includes a driving transistor T1, an initialization module 100 and a compensation module 200. The driving transistor T1 includes an output terminal, an input terminal, a first control terminal and a second control terminal. In the light-emitting stage, the first control terminal of the driving transistor T1 generates a driving current after receiving a data signal Data. The output terminal of the driving transistor T1 is electrically connected to the light-emitting device LED to transmit the driving current to the light-emitting device LED, thereby driving the light-emitting device LED to emit light.

[0050] The initialization module 100 is configured to transmit a first initialization voltage V to the first control terminal of the driving transistor T1 during the initialization phase. ref , transmits a second initialization voltage V to the output terminal of the driving transistor T1 init It can be understood that by transmitting the first initialization voltage V to the first control terminal of the driving transistor T1 ref, transmits a second initialization voltage V to the output terminal of the driving transistor T1 init , so that in the initialization phase, the first control terminal and the output terminal of the driving transistor T1 are reset to corresponding potentials.

[0051] The compensation module 200 is electrically connected to the second control terminal. The compensation module 200 adjusts the potential of the second control terminal in a compensation phase after an initialization phase, thereby compensating for the threshold voltage of the driving transistor T1 .

[0052] The driving transistor T1 is an N-type dual-gate transistor, the first control terminal of the driving transistor T1 corresponds to the top gate of the driving transistor T1, the second control terminal of the driving transistor T1 corresponds to the bottom gate of the driving transistor T1, the output terminal of the driving transistor T1 corresponds to the source of the driving transistor T1, and the input terminal of the driving transistor T1 corresponds to the drain of the driving transistor T1.

[0053] In the compensation phase, the first initialization voltage V ref is less than the second initialization voltage V init Since the first initialization voltage Vref is less than the second initialization voltage V init , so that the voltage of the first control terminal of the driving transistor T1 is less than the voltage of the output terminal of the driving transistor T1, that is, the voltage V of the top gate of the driving transistor T1 g is less than the source voltage V of the driving transistor T1 s , thereby applying a negative gate voltage (V gs , the voltage difference between the top gate and the source of the driving transistor T1), that is, the negative bias of the threshold voltage of the driving transistor T1 is offset, so that V th >0. Therefore, when the compensation module 200 compensates the driving transistor T1, the threshold voltage of the driving transistor T1 can be accurately detected.

[0054] In this embodiment, during the compensation phase, a first initialization voltage V is applied to the first control terminal of the driving transistor T1 and the output terminal of the driving transistor T1 respectively. ref and the second initialization voltage V init , and make the first initialization voltage Vref less than the second initialization voltage V init , thereby applying a negative gate voltage to the driving transistor T1, so that when the compensation module 200 compensates the driving transistor T1, it can detect the threshold voltage of the driving transistor T1 and then accurately compensate the threshold voltage of the driving transistor T1.

[0055] In one embodiment, the initialization module 100 includes a first initialization transistor T2 and a second initialization transistor T3, wherein the input terminal of the first initialization transistor T2 is used to receive the first initialization voltage V ref The output terminal of the first initialization transistor T2 is electrically connected to the first control terminal of the driving transistor T1, and the control terminal of the first initialization transistor T2 is used to receive the sensing signal Sense. The input terminal of the second initialization transistor T3 is used to receive the second initialization voltage V init , the output end of the second initialization transistor T3 is electrically connected to the output end of the transistor, and the control end of the second initialization transistor T3 is used to receive the sensing signal Sense. During the initialization stage, under the control of the sensing signal Sense, the first initialization transistor T2 and the second initialization transistor T3 output the first initialization signal and the second initialization signal to the first control end of the driving transistor T1 and the output end of the driving transistor T1, respectively.

[0056] In one embodiment, the compensation module 200 includes a compensation transistor T4 and a first storage capacitor C th The input terminal of the compensation transistor T4 is electrically connected to the second control terminal of the driving transistor T1, the output terminal of the compensation transistor T4 is electrically connected to the input terminal of the driving transistor T1, and the control terminal of the compensation transistor T4 is used to receive the sensing signal Sense. The first storage capacitor C th The compensation transistor T4 is electrically connected to the second control terminal of the driving transistor T1 and the output terminal of the driving transistor T1. In the compensation stage, under the control of the sensing signal Sense, the compensation transistor T4 is turned on, so that the second control terminal of the driving transistor T1 is connected to the output terminal of the driving transistor T1, thereby th The threshold voltage of the driving transistor T1 is sensed.

[0057] In one embodiment, the pixel driving circuit further includes a light emitting control module 300, a data module 400 and a storage capacitor. The light emitting control module 300 includes a light emitting control transistor T6, the input end of the light emitting control transistor T6 is used to receive a first power supply voltage, the control end of the light emitting control transistor T6 is used to receive a light emitting control signal EM, and the output end of the light emitting control transistor T6 is electrically connected to the input end of the driving transistor T1. In the light emitting stage, the light emitting control transistor T6 is turned on under the control of the light emitting control signal EM to make the light emitting device LED emit light.

[0058] The data module 400 includes a data transistor T5, an input end of the data transistor T5 is used to receive a data signal Data, an output end of the data transistor T5 is electrically connected to the first control end of the driving transistor T1, and a control end of the data transistor T5 is used to receive a scan signal Scan. In the writing phase, the data transistor T5 is turned on under the control of the scan signal Scan, and the data signal Data is written to the first control end of the driving transistor T1.

[0059] The second storage capacitor C st The storage capacitor is electrically connected to the first control terminal of the driving transistor T1 and the output terminal of the driving transistor T1. The storage capacitor can store the voltage of the first control terminal.

[0060] like Figure 1 and Figure 2 As shown, in one embodiment, a specific structure of a pixel driving circuit is provided. The pixel driving circuit is used to drive a light emitting device LED, and the pixel driving circuit includes a driving transistor T1, a light emitting control transistor T6, a data transistor T5, a first initialization transistor T2, a second initialization transistor T3, a compensation transistor T4, a first storage capacitor C th and the second storage capacitor C st .

[0061] The control end of the light-emitting control transistor T6 receives the light-emitting control signal EM, the input end of the light-emitting control transistor T6 is electrically connected to the first power end to receive the first power signal EVDD, and the output end of the light-emitting control transistor T6 is electrically connected to the input end of the driving transistor T1. The output end of the driving transistor T1 is electrically connected to the anode of the light-emitting device LED, and the cathode of the light-emitting device LED is electrically connected to the second power end to receive the second power signal VSS. The control end of the data transistor T5 receives the scan signal Scan, the input end of the data transistor T5 receives the data signal Data, and the output end of the data transistor T5 is electrically connected to the first control end of the driving transistor T1. The control end of the first initialization transistor T2 receives the sensing signal, and the input end of the first initialization transistor T2 receives the first initialization voltage V ref The output terminal of the first initialization transistor T2 is electrically connected to the first control terminal of the driving transistor T1. The control terminal of the second initialization transistor T3 receives the sensing signal Sense, and the input terminal of the second initialization transistor T3 receives the second initialization voltage V initThe output end of the second initialization transistor T3 is electrically connected to the output end of the driving transistor T1. The control end of the compensation transistor T4 receives the sensing signal Sense, the input end of the compensation transistor T4 is electrically connected to the input end of the driving transistor T1, and the output end of the compensation transistor T4 is electrically connected to the second control end of the driving transistor T1. The first storage capacitor C th The first end of the first storage capacitor C is electrically connected to the second control end of the driving transistor T1. th The second end of the second storage capacitor C is electrically connected to the output end of the driving transistor T1. st The first end of the second storage capacitor C is electrically connected to the first control end of the driving transistor T1. st The second end of is electrically connected to the output end of the driving transistor T1.

[0062] The pixel driving circuit includes an initialization phase, a compensation phase, a writing phase and a light emitting phase.

[0063] In the initialization stage, the light emitting control signal EM is at a high level, the sensing signal Sense is at a high level, and the scanning signal Scan is at a low level. The light emitting control transistor T6, the driving transistor T1, the first initialization transistor T2, and the second initialization transistor T3 are turned on. The first power supply signal EVDD is written to points d and b, the first initialization signal is written to point g, i.e., the first control terminal of the driving transistor T1, and the second initialization signal is written to point s, i.e., the output terminal of the driving transistor T1. Therefore, the first storage capacitor C th And the second storage capacitor Cst starts to be charged.

[0064] In the compensation stage, the light emitting control signal EM is at a low level, the sensing signal Sense is at a high level, and the scanning signal Scan is at a low level. The driving transistor T1, the first initialization transistor T2, and the second initialization transistor T3 are turned on. Since the second initialization transistor T3 and the driving transistor T1 are turned on, the voltage at point b decreases continuously. Figure 3 As shown, until V gs +αV bs =V th Among them, V gs is the voltage difference between the first control terminal of the driving transistor T1 and the output terminal of the driving transistor T1, V bs is the voltage difference between the second control terminal of the driving transistor T1 and the output terminal of the driving transistor T1, and α is a constant. Since the first control terminal of the driving transistor T1 and the output terminal of the driving transistor T1 receive the first initialization voltage Vref and the second initialization voltage V init , so the V gs =V ref –V init , so V th =V gs +αV bs =V ref –V init +αV bs , converted to αV bs =V th –V ref +V init . Since the αV bs Stored in the first storage capacitor C th Therefore, the first storage capacitor C th In the compensation phase, the threshold voltage V of the driving transistor T1 is stored. th The initialization module 100 applies a first initialization voltage V to the first control terminal and the output terminal. ref and the second initialization voltage V init , thereby completing the compensation of the driving transistor T1.

[0065] In the writing phase, the light control signal EM is at a low level, the sensing signal Sense is at a low level, and the scanning signal Scan is at a high level. The data transistor T5 and the driving transistor T1 are turned on. The data signal Data is written to point g, i.e., the data voltage V data Write the first control terminal of the driving transistor T1, and write the second storage capacitor C st to charge.

[0066] In the light-emitting stage, the light-emitting control signal EM is at a high level, the sensing signal Sense is at a low level, and the scanning signal Scan is at a low level. The light-emitting control transistor T6 and the driving transistor T1 are turned on. The driving transistor T1 is at the data voltage V data The driving current is generated under control to make the light emitting device LED emit light. The current formula based on the dual-gate transistor is:

[0067] I=k*(V gs +αV bs -V th ) 2

[0068] Wherein, I is the current of the driving transistor T1, and K is the characteristic coefficient of the driving transistor T1.

[0069] Due to αV bs =V th –Vref +V init , so I=k*(V gs +αV bs -V th ) 2 can be transformed into:

[0070] I=k*(V data -V init +αV bs -V th ) 2

[0071] =k*(V data -V init +V th -V ref +V init -V th ) 2

[0072] =k*(V data -V ref ) 2

[0073] From the above derivation, it can be seen that in the compensation stage, the first storage capacitor C th The precise threshold voltage V of the driving transistor T1 is stored. th The initialization module 100 applies a first initialization voltage V to the first control terminal and the output terminal. ref and the second initialization voltage V init Therefore, in the light emitting stage, the threshold voltage of the driving transistor T1 is completely offset, so that the driving current is not affected by the threshold voltage of the driving transistor T1.

[0074] like Figure 4 and Figure 5 As shown, an embodiment of the present invention further provides a driving method for driving the above pixel driving circuit, the method comprising:

[0075] S100, initialization phase and compensation phase, controlling the initialization module 100 to transmit the first initialization voltage V to the first control terminal of the driving transistor ref , transmitting the second initialization voltage V to the output terminal of the driving transistor init Wherein, the first initialization voltage V ref is less than the second initialization voltage V init .

[0076] Control the first initialization transistor T2 and the second initialization transistor T3 to output a first initialization voltage V to the first control terminal and the output terminal of the driving transistor T1 respectively. ref and the second initialization voltage V init .

[0077] S200 , in the compensation stage, controlling the compensation module 200 to adjust the potential of the second control terminal to compensate for the threshold voltage of the driving transistor T1 .

[0078] The second initialization transistor T3 and the driving transistor T1 are controlled to be turned on, so that the voltage of the second control terminal is continuously reduced until V gs +αV bs =V th Among them, V gs is the voltage difference between the first control terminal of the driving transistor T1 and the output terminal of the driving transistor T1, V bs is the voltage difference between the second control terminal of the driving transistor T1 and the output terminal of the driving transistor T1, and α is a constant. Since the first control terminal of the driving transistor T1 and the output terminal of the driving transistor T1 receive the first initialization voltage V ref and the second initialization voltage V init , so the V gs =V ref –V init , so V th =V gs +αV bs =V ref –V init +αV bs , converted to αV bs =V th –V ref +V init .

[0079] Since the first initialization voltage V ref is less than the second initialization voltage V init Therefore, the voltage of the top gate of the driving transistor T1 is less than the voltage of the source of the driving transistor T1, thereby applying a negative gate voltage to the driving transistor T1, that is, offsetting the negative bias of the threshold voltage of the driving transistor T1, making V th >0. Therefore, when the compensation module 200 compensates the driving transistor T1, the threshold voltage of the driving transistor T1 can be accurately detected.

[0080] Since the αV bs is stored in the first storage capacitor C thTherefore, the first storage capacitor C th In the compensation phase, the threshold voltage V of the driving transistor T1 is stored. th The initialization module 100 applies a first initialization voltage V to the first control terminal and the output terminal. ref and the second initialization voltage V init The voltage difference is thus obtained, thereby accurately detecting the threshold voltage of the driving transistor T1.

[0081] S300: In the writing phase, the data transistor T5 is controlled to be turned on, so that the data transistor T5 transmits the data signal Data to the first control terminal of the driving transistor T1 and supplies the data signal to the first storage capacitor C th Charge.

[0082] S400 . In the light emitting phase, control the driving transistor to generate the driving current to drive the light emitting device LED.

[0083] In the light emitting stage, the light emitting control transistor T6 is controlled to be turned on, so that the driving transistor T1 generates a driving current based on the data voltage, thereby driving the light emitting device LED to emit light.

[0084] In one embodiment, the S200 includes:

[0085] S201 . In the compensation stage, the initialization module 100 and the compensation module 200 are both turned on, and the compensation module 200 makes the potentials of the input terminal and the second control terminal of the driving transistor the same.

[0086] In the compensation stage, the compensation transistor T4 is controlled to be turned on, and the first initialization transistor T2 and the second initialization transistor T3 are controlled to be turned on. Since the compensation transistor T4 is turned on, the input end of the driving transistor is connected to the second control end, and the potential of the input end of the driving transistor and the second control end are the same.

[0087] In one embodiment, the initialization module 100 and the compensation module 200 both receive a sensing signal Sense, so as to be turned on and off simultaneously under the control of the sensing signal Sense.

[0088] An embodiment of the present invention further provides a display panel, comprising the pixel driving circuit as described in any one of the above embodiments.

[0089] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A pixel driving circuit, characterized in that: The pixel driving circuit comprises: a driving transistor, comprising an output terminal, an input terminal, a first control terminal and a second control terminal, configured to generate a driving current in a light emitting phase through a signal received by the first control terminal, and drive the light emitting device by electrically connecting the output terminal to the light emitting device; an initialization module, configured to transmit a first initialization voltage to the first control terminal of the driving transistor and transmit a second initialization voltage to the output terminal of the driving transistor in an initialization phase and a compensation phase; a compensation module, electrically connected to the second control terminal, and configured to: adjust the potential of the second control terminal in a compensation phase to compensate for the threshold voltage of the driving transistor; Wherein, the first initialization voltage is smaller than the second initialization voltage.

2. The pixel driving circuit according to claim 1, characterized in that: The initialization module includes: a first initialization transistor, wherein an input terminal of the first initialization transistor is used to receive the first initialization voltage, an output terminal of the first initialization transistor is electrically connected to the first control terminal of the driving transistor, and a control terminal of the first initialization transistor is used to receive a sensing signal; A second initialization transistor, wherein the input terminal of the second initialization transistor is used to receive the second initialization voltage, the output terminal of the second initialization transistor is electrically connected to the output terminal of the transistor, and the control terminal of the second initialization transistor is used to receive the sensing signal.

3. The pixel driving circuit according to claim 2, characterized in that: The compensation module comprises: A compensation transistor, wherein the input end of the compensation transistor is electrically connected to the second control end of the driving transistor, the output end of the compensation transistor is electrically connected to the input end of the driving transistor, and the control end of the compensation transistor is used to receive the sensing signal.

4. The pixel driving circuit according to claim 3, characterized in that: The compensation module also includes: A first storage capacitor is electrically connected to the second control terminal of the driving transistor and the output terminal of the driving transistor.

5. The pixel driving circuit according to claim 1, characterized in that: Also includes: A light emitting control module, comprising a light emitting control transistor, wherein an input end of the light emitting control transistor is used to receive a first power supply voltage, a control end of the light emitting control transistor is used to receive a light emitting control signal, and an output end of the light emitting control transistor is electrically connected to the input end of the driving transistor; A data module, comprising a data transistor, wherein an input end of the data transistor is used to receive a data signal, an output end of the data transistor is electrically connected to the first control end of the driving transistor, and a control end of the data transistor is used to receive a scan signal; A second storage capacitor is electrically connected to the first control terminal of the driving transistor and the output terminal of the driving transistor.

6. A pixel driving circuit for driving a light emitting device, characterized in that: include: A driving transistor, comprising an output terminal, an input terminal, a first control terminal and a second control terminal, wherein the input terminal is electrically connected to the first power terminal, and the output terminal is electrically connected to the second power terminal through the light emitting device; a light emitting control transistor, comprising a control terminal for receiving a light emitting control signal, an input terminal electrically connected to the first power terminal, and an output terminal electrically connected to the input terminal of the driving transistor; a data transistor, comprising a control terminal for receiving a scan signal, an input terminal for receiving a data signal, and an output terminal electrically connected to the first control terminal of the driving transistor; a first initialization transistor, comprising a control terminal for receiving a sensing signal, an input terminal for receiving a first initialization voltage, and an output terminal electrically connected to the first control terminal of the driving transistor; a second initialization transistor, comprising a control terminal for receiving the sensing signal, an input terminal for receiving a second initialization voltage, and an output terminal electrically connected to the output terminal of the driving transistor; a compensation transistor, comprising a control terminal for receiving the sensing signal, an input terminal electrically connected to the input terminal of the driving transistor, and an output terminal electrically connected to the second control terminal of the driving transistor; a first storage capacitor, comprising a first end electrically connected to the second control end of the driving transistor, and a second end electrically connected to the output end of the driving transistor; as well as The second storage capacitor includes a first end electrically connected to the first control end of the driving transistor, and a second end electrically connected to the output end of the driving transistor.

7. A driving method of a pixel driving circuit, used for driving the pixel driving circuit as claimed in claim 1, characterized in that: The method comprises: In the initialization phase and the compensation phase, controlling the initialization module to transmit the first initialization voltage to the first control terminal of the driving transistor and to transmit the second initialization voltage to the output terminal of the driving transistor; In the compensation stage, controlling the compensation module to adjust the potential of the second control terminal to compensate for the threshold voltage of the driving transistor; In the light emitting stage, controlling the driving transistor to generate the driving current to drive the light emitting device; Wherein, the first initialization voltage is smaller than the second initialization voltage.

8. The driving method of the pixel driving circuit according to claim 7, characterized in that: In the compensation stage, the initialization module and the compensation module are both turned on, and the compensation module makes the potentials of the input terminal and the second control terminal of the driving transistor the same.

9. The driving method of the pixel driving circuit according to claim 7, characterized in that: The initialization module and the compensation module receive the same control signal so as to be turned on and off simultaneously under the control of the same control signal.

10. A display panel, characterized in that: The pixel driving circuit comprises the pixel driving circuit as claimed in any one of claims 1 to 9.

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