Pixel driving circuit, display device, and driving method

Abstract

The present application relates to the technical field of display, and discloses a pixel driving circuit, a display device, and a driving method. The pixel driving circuit comprises: a threshold compensation sub-circuit which provides a reference voltage to a first gate; a conduction control sub-circuit which connects a second gate and a first electrode of the driving transistor; a first compensation capacitor having a first terminal coupled to the first gate and a second terminal coupled to the first electrode; a data writing sub-circuit which provides a data voltage to the second gate; a second compensation capacitor having a first terminal coupled to the second gate and a second terminal coupled to a set node; and a light-emitting control sub-circuit which provides a driving current generated by the driving transistor to a light-emitting device. The threshold compensation sub-circuit obtains a voltage difference between the first gate and the first electrode when a threshold voltage is zero, and the first compensation capacitor stores the voltage difference, so as to maintain the threshold voltage at zero. Thus, the impact of the threshold voltage is eliminated during generation of a driving current, thereby improving the image display quality.

Description

Pixel driving circuit, display device and driving method

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202410823127.7, filed on June 24, 2024, and entitled "Pixel driving circuit, display device and driving method", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of display, and provides a pixel driving circuit, a display device and a driving method. BACKGROUND

[0004] In the related art, when the pixel driving circuit of the display panel is composed of a full-oxide type driving transistor, the full-oxide type driving transistor is sensitive to oxide characteristics, which causes the threshold voltage of the driving transistor to fluctuate. As a result, the threshold voltage difference between each pixel point in the display panel is large, which causes the display picture to be uneven. SUMMARY

[0005] The embodiments of the present application provide a pixel driving circuit, a display device and a driving method, which are used to obtain the voltage difference between the first gate and the first pole of the driving transistor when the threshold voltage is zero in advance, so as to eliminate the influence of the threshold voltage on the driving current generated by each pixel point, and improve the display effect.

[0006] The specific technical solutions provided by the present application are as follows:

[0007] In a first aspect, the embodiments of the present application provide a pixel driving circuit, comprising: a driving transistor, a threshold compensation sub-circuit, a conduction control sub-circuit, a first compensation capacitor, a data writing sub-circuit, a second compensation capacitor, a light-emitting control sub-circuit and a light-emitting device, wherein the driving transistor is a double-gate transistor.

[0008] The threshold compensation sub-circuit is coupled to the first gate of the driving transistor, and is configured to provide a reference voltage of a reference signal end to the first gate in response to a signal of a compensation signal end.

[0009] The conduction control sub-circuit is coupled to the second gate of the driving transistor, and is configured to communicate the second gate of the driving transistor with the first pole of the driving transistor in response to a signal of a conduction signal end.

[0010] The first end of the first compensation capacitor is coupled to the first gate, and the second end of the first compensation capacitor is coupled to the first pole of the driving transistor.

[0011] The data writing sub-circuit is coupled with the second gate of the driving transistor and is configured to provide a data voltage of a data signal terminal to the second gate of the driving transistor in response to a signal of a scan signal terminal;

[0012] The first end of the second compensation capacitor is coupled with the second gate, and the second end of the second compensation capacitor is coupled with a setting node, wherein the setting node is the first electrode of the driving transistor or the anode of the light emitting device;

[0013] The driving transistor is configured to generate a driving current according to the data voltage;

[0014] The light emitting control sub-circuit is coupled with the second electrode of the driving transistor, the first electrode of the driving transistor and the anode of the light emitting device respectively, and is configured to provide the driving current to the light emitting device in response to a signal of a light emitting control terminal.

[0015] Optionally, the threshold compensation sub-circuit comprises a first switch transistor;

[0016] The control terminal of the first switch transistor is coupled with a compensation signal terminal, the first end of the first switch transistor is coupled with the first gate of the driving transistor, and the second end of the first switch transistor is coupled with a reference signal terminal.

[0017] Optionally, the conduction control sub-circuit comprises a second switch transistor;

[0018] The control terminal of the second switch transistor is coupled with a conduction signal terminal, the first end of the second switch transistor is coupled with the second gate of the driving transistor, and the second end of the second switch transistor is coupled with the first electrode of the driving transistor.

[0019] Optionally, the data writing sub-circuit comprises a third switch transistor;

[0020] The control terminal of the third switch transistor is coupled with the scan signal terminal, the first end of the third switch transistor is coupled with the data signal terminal, and the second end of the third switch transistor is coupled with the second gate of the driving transistor.

[0021] Optionally, the light emitting control sub-circuit comprises a fourth switch transistor and a fifth switch transistor, and the light emitting control terminal comprises a first light emitting control terminal and a second light emitting control terminal;

[0022] The control terminal of the fourth switch transistor is coupled with the first light emitting control terminal, the first end of the fourth switch transistor is coupled with a first power supply terminal, and the second end of the fourth switch transistor is coupled with the second electrode of the driving transistor;

[0023] The control terminal of the fifth switch transistor is coupled with the second light emitting control terminal, the first end of the fifth switch transistor is coupled with the first electrode of the driving transistor, and the second end of the fifth switch transistor is coupled with the anode of the light emitting device.

[0024] Optionally, the pixel driving circuit further comprises a first reset sub-circuit;

[0025] The first reset sub-circuit is coupled to the anode of the light emitting device and configured to provide an initialization signal of an initialization signal terminal to the anode of the light emitting device in response to a signal of a reset signal terminal.

[0026] Optionally, the first reset sub-circuit comprises a sixth switch transistor.

[0027] The control terminal of the sixth switch transistor is coupled to the reset signal terminal, the first terminal of the sixth switch transistor is coupled to the anode of the light emitting device, and the second terminal of the sixth switch transistor is coupled to the initialization signal terminal.

[0028] Optionally, the pixel driving circuit further comprises a second reset sub-circuit.

[0029] The second reset sub-circuit is coupled to the first electrode of the driving transistor and configured to provide the initialization signal of the initialization signal terminal to the first electrode of the driving transistor in response to the signal of the reset signal terminal.

[0030] Optionally, the second reset sub-circuit comprises a seventh switch transistor.

[0031] The control terminal of the seventh switch transistor is coupled to the reset signal terminal, the first terminal of the seventh switch transistor is coupled to the first electrode of the driving transistor, and the second terminal of the seventh switch transistor is coupled to the initialization signal terminal.

[0032] Optionally, the voltage value of the initialization signal is less than the voltage value of the reference voltage.

[0033] In a second aspect, the embodiments of the present application further provide a display device comprising the pixel driving circuit of any one of the above.

[0034] In a third aspect, the embodiments of the present application further provide a driving method of the pixel driving circuit of any one of the above, comprising:

[0035] In a first stage, the threshold compensation sub-circuit provides a reference voltage of a reference signal terminal to the first gate of the driving transistor in response to a signal of a compensation signal terminal; the first reset sub-circuit provides an initialization signal of an initialization signal terminal to the anode of the light emitting device in response to a signal of a reset signal terminal, and provides the initialization signal of the initialization signal terminal to the first electrode of the driving transistor through the light emitting control sub-circuit, or the second reset sub-circuit provides the initialization signal of the initialization signal terminal to the first electrode of the driving transistor in response to the signal of the reset signal terminal; the turn-on control sub-circuit communicates the second gate of the driving transistor with the first electrode of the driving transistor in response to a signal of a turn-on signal terminal, and provides the initialization signal of the first electrode of the driving transistor to the second gate of the driving transistor; the driving transistor is turned on, and the initialization signal of the first electrode of the driving transistor is provided to the second electrode of the driving transistor through the turned-on driving transistor;

[0036] The second stage: the conduction control sub-circuit responds to the signal of the conduction signal end, and connects the second gate of the driving transistor with the first electrode of the driving transistor, so that the potentials of the first electrode and the second gate of the driving transistor are equal; in the process that the first voltage signal of the first power supply end is provided to the second electrode of the driving transistor, the gate-source of the driving transistor is reset, the threshold voltage of the driving transistor is obtained as zero in the reset process, and the voltage difference between the first gate and the first electrode is obtained and stored in the first compensation capacitor;

[0037] The third stage: the data writing sub-circuit responds to the signal of the scanning signal end, and provides the data voltage of the data signal end to the second gate of the driving transistor; the first reset sub-circuit responds to the signal of the reset signal end, and provides the initialization signal of the initialization signal end to the anode of the light emitting device, and provides the initialization signal to the first electrode of the driving transistor through the light emitting control sub-circuit, or the second reset sub-circuit responds to the signal of the reset signal end, and provides the initialization signal of the initialization signal end to the first electrode of the driving transistor, so that the first compensation capacitor maintains the voltage difference, and the voltage difference of the second compensation capacitor is the voltage difference between the data voltage and the initialization signal;

[0038] The fourth stage: the driving transistor generates a driving current according to the data voltage, and the light emitting control sub-circuit responds to the signal of the light emitting control end, and provides the driving current to the light emitting device.

[0039] The application has the following beneficial effects:

[0040] In summary, the pixel driving circuit, the display device and the driving method provided in the embodiments of the present application have the following advantages. The pixel driving circuit comprises a driving transistor, a threshold compensation sub-circuit, a conduction control sub-circuit, a first compensation capacitor, a data writing sub-circuit, a second compensation capacitor, a light-emitting control sub-circuit and a light-emitting device. The driving transistor is a double-gate transistor. The threshold compensation sub-circuit is coupled to a first gate of the driving transistor and is configured to provide a reference voltage of a reference signal end to the first gate of the driving transistor in response to a signal of a compensation signal end. The conduction control sub-circuit is coupled to a second gate of the driving transistor and is configured to communicate the second gate of the driving transistor with a first electrode of the driving transistor in response to a signal of a conduction signal end. A first end of the first compensation capacitor is coupled to the first gate, and a second end of the first compensation capacitor is coupled to the first electrode of the driving transistor. The data writing sub-circuit is coupled to the second gate of the driving transistor and is configured to provide a data voltage of a data signal end to the second gate of the driving transistor in response to a signal of a scanning signal end. A first end of the second compensation capacitor is coupled to the second gate, and a second end of the second compensation capacitor is coupled to a set node. The set node is the first electrode of the driving transistor or an anode of the light-emitting device. The driving transistor is configured to generate a driving current according to the data voltage. The light-emitting control sub-circuit is coupled to the second electrode of the driving transistor, the first electrode of the driving transistor and the anode of the light-emitting device, respectively, and is configured to provide the driving current to the light-emitting device in response to a signal of a light-emitting control end. The voltage difference between the first gate and the first electrode of the driving transistor when the threshold voltage is zero is obtained through the threshold compensation sub-circuit, and the voltage difference is saved and maintained through the first compensation capacitor. In this way, the threshold voltage can also be maintained at zero value, and the influence of the threshold voltage on the driving current in the process of generating the driving current is eliminated, thereby effectively ensuring the uniformity of the driving current and improving the display effect of the picture.

[0041] Additional features and advantages of the application will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0042] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0043] FIG. 1 is a schematic view of the relationship between the voltage difference between the first gate and the first electrode of the driving transistor and the threshold voltage in the embodiments of the present application;

[0044] FIG. 2 is a schematic view of the connection of the first pixel driving circuit in the embodiments of the present application;

[0045] Fig. 3 is a first circuit connection diagram of a first pixel driving circuit in the embodiment of the present application;

[0046] Fig. 4 is a second circuit connection diagram of the first pixel driving circuit in the embodiment of the present application;

[0047] Fig. 5 is a connection diagram of a second pixel driving circuit in the embodiment of the present application;

[0048] Fig. 6 is a first circuit connection diagram of the second pixel driving circuit in the embodiment of the present application;

[0049] Fig. 7 is a second circuit connection diagram of the second pixel driving circuit in the embodiment of the present application;

[0050] Fig. 8 is a timing diagram of the first pixel driving circuit in the embodiment of the present application;

[0051] Fig. 9 is a timing diagram of the second pixel driving circuit in the embodiment of the present application;

[0052] Fig. 10 is a flow chart of a driving method of a pixel driving circuit in the embodiment of the present application. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme 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 part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments described in the present application document, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application technical scheme.

[0054] The terms "first", "second", and the like in the specification of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0055] In the related art, when the pixel driving circuit of the display panel is composed of a full-oxide type driving transistor, the above-mentioned full-oxide type driving transistor is sensitive to oxide characteristics, resulting in a variation in the threshold voltage of the driving transistor. Thus, the threshold voltage difference between each pixel point in the display panel is large, resulting in uneven display of the display picture.

[0056] The preferred embodiments of the present application will be described in detail below in conjunction with the drawings.

[0057] Firstly, the relationship between the voltage difference VBS between the first gate and the first electrode of the driving transistor TD which is a double-gate transistor in the embodiment of the present application and the threshold voltage is introduced. Referring to FIG. 1, the curves of different line types represent that the greater the voltage difference VBS, the more the threshold voltage of the driving transistor TD deviates to the negative value. For example, the value of the horizontal coordinate corresponding to the line type of curve 1 (for example, the voltage difference VBS is 6V) is the minimum (for example, the threshold voltage VBS is about -2V).

[0058] Referring to FIG. 2, a pixel driving circuit proposed in the embodiment of the present application includes a driving transistor TD, a threshold compensation sub-circuit 10, a conduction control sub-circuit 20, a first compensation capacitor C1, a data writing sub-circuit 30, a second compensation capacitor C2, a light-emitting control sub-circuit 40 and a light-emitting device LED, wherein the driving transistor TD is a double-gate transistor.

[0059] It needs to be explained that in the embodiment of the present application, the driving transistor TD is a double-gate transistor, which specifically includes four electrodes: a first gate, a second gate, a first electrode and a second electrode. Referring to FIG. 3, the first gate refers to the bottom gate of the driving transistor TD, that is, one electrode of the driving transistor TD coupled with the threshold compensation sub-circuit 10. The second gate refers to the top gate of the driving transistor TD, that is, one electrode of the driving transistor TD coupled with the data writing sub-circuit 30. The first electrode can be the source electrode or the drain electrode of the driving transistor TD, and correspondingly, the second electrode can be the drain electrode or the source electrode of the driving transistor TD.

[0060] The working processes of the driving transistor TD, the threshold compensation sub-circuit 10, the conduction control sub-circuit 20, the first compensation capacitor C1, the data writing sub-circuit 30, the second compensation capacitor C2, the light-emitting control sub-circuit 40 and the light-emitting device LED in the embodiment of the present application are introduced below in combination with the circuit diagram.

[0061] The threshold compensation sub-circuit 10 is coupled with the first gate of the driving transistor TD and is configured to provide the reference voltage of the reference signal end Vref to the first gate in response to the signal of the compensation signal end SC1.

[0062] In the implementation process, when the signal of the compensation signal end SC1 is effective, the reference voltage of the reference signal end Vref is provided to the first gate of the driving transistor TD through the threshold compensation sub-circuit 10.

[0063] Exemplarily, referring to FIG. 3, the threshold compensation sub-circuit 10 includes a first switch transistor T1.

[0064] Referring to FIG. 3, the connection relationship between the first switch transistor T1 and other components is as follows: the control end of the first switch transistor T1 is coupled with the compensation signal end SC1, the first end of the first switch transistor T1 is coupled with the first gate of the drive transistor TD, and the second end of the first switch transistor T1 is coupled with the reference signal end Vref.

[0065] In the implementation process, when the signal of the compensation signal end SC1 is high, the first switch transistor T1 is turned on, and the reference voltage of the reference signal end Vref is provided to the first gate of the drive transistor TD through the turned-on first switch transistor T1.

[0066] The on-off control sub-circuit 20 is coupled with the second gate of the drive transistor TD and is configured to, in response to the signal of the on-off signal end SC1, communicate the second gate of the drive transistor TD with the first electrode of the drive transistor TD.

[0067] In the implementation process, when the signal of the on-off signal end SC1 is effective, the second gate of the drive transistor TD is communicated with the first electrode of the drive transistor TD through the on-off control sub-circuit 20.

[0068] Exemplarily, referring to FIG. 3, the on-off control sub-circuit 20 includes a second switch transistor T2.

[0069] Referring to FIG. 3, the connection relationship between the second switch transistor T2 and other components is as follows: the control end of the second switch transistor T2 is coupled with the on-off signal end SC1, the first end of the second switch transistor T2 is coupled with the second gate of the drive transistor TD, and the second end of the second switch transistor T2 is coupled with the first electrode of the drive transistor TD.

[0070] In the implementation process, when the signal of the on-off signal end SC1 is high, the second switch transistor T2 is turned on, and the second gate of the drive transistor TD is communicated with the first electrode of the drive transistor TD through the turned-on second switch transistor T2.

[0071] It should be noted that the on-off signal end and the compensation signal end can be the same signal end or different signal ends.

[0072] Referring to FIG. 3, the first end of the first compensation capacitor C1 is coupled with the first gate, and the second end of the first compensation capacitor C1 is coupled with the first electrode of the drive transistor TD.

[0073] In the implementation process, the first compensation capacitor C1 is used to store the voltage difference between the first gate and the first electrode of the drive transistor TD, and can maintain the voltage difference between the first gate and the first electrode unchanged by using the voltage stabilization effect of the capacitor.

[0074] The data write sub-circuit 30 is coupled to the second gate of the driving transistor TD and configured to provide the data voltage of the data signal terminal Data to the second gate of the driving transistor TD in response to the signal of the scan signal terminal Gate.

[0075] In implementation, when the signal of the scan signal terminal Gate is active, the data voltage of the data signal terminal Data is provided to the second gate of the driving transistor TD through the data write sub-circuit 30.

[0076] For example, referring to FIG. 3, the data write sub-circuit 30 includes a third switch transistor T3.

[0077] Referring to FIG. 3, the third switch transistor T3 is coupled to the scan signal terminal Gate at the control terminal, coupled to the data signal terminal Data at the first terminal, and coupled to the second gate of the driving transistor TD at the second terminal.

[0078] In implementation, when the signal of the scan signal terminal Gate is high, the third switch transistor T3 is turned on, and the data voltage of the data signal terminal Data is provided to the second gate of the driving transistor TD through the turned-on third switch transistor T3, thereby realizing the writing of the data voltage.

[0079] Referring to FIG. 3, the first terminal of the second compensation capacitor C2 is coupled to the second gate, and the second terminal of the second compensation capacitor C2 is coupled to the set node, wherein the set node is the first electrode of the driving transistor TD or the anode of the light emitting device LED.

[0080] In implementation, the second compensation capacitor C2 is used to store the voltage difference between the second gate of the driving transistor TD and the set node, i.e., referring to FIG. 3 and FIG. 4, when the set node is the first electrode of the driving transistor TD, the second compensation capacitor C2 is used to store the voltage difference between the second gate of the driving transistor TD and the first electrode of the driving transistor TD; referring to FIG. 5, FIG. 6 and FIG. 7, when the set node is the anode of the light emitting device LED, the second compensation capacitor C2 is used to store the voltage difference between the second gate of the driving transistor TD and the anode of the light emitting device LED. The voltage difference between the second gate and the anode of the light emitting device LED stored by the second compensation capacitor C2 can also be maintained by the voltage stabilizing effect of the capacitor.

[0081] The driving transistor TD is configured to generate a driving current according to the data voltage.

[0082] In implementation, the driving current of the driving transistor TD is Id=1 / 2*W / L*Cox*μ*(Vgs-Vth) 2Wherein Vgs is the voltage difference between the second gate and the first electrode of the driving transistor TD, and Vth is the threshold voltage of the driving transistor TD. The driving transistor TD further provides the driving current to the light emitting device LED, so that the light emitting device LED emits light under the action of the driving current.

[0083] The light emitting control sub-circuit 40 is coupled with the second electrode of the driving transistor TD, the first electrode of the driving transistor TD and the anode of the light emitting device LED, and is configured to provide the driving current to the light emitting device LED in response to the signal of the light emitting control end.

[0084] In the implementation process, when the signal of the light emitting control end is effective, the first power end ELVDD is communicated with the second electrode of the driving transistor TD through the light emitting control sub-circuit 40, and the first electrode of the driving transistor TD is communicated with the anode of the light emitting device LED through the light emitting control sub-circuit 40. On this basis, the light emitting control sub-circuit 40 can provide the driving current to the light emitting device LED.

[0085] Exemplarily, referring to FIG. 3, the light emitting control sub-circuit 40 includes a fourth switch transistor T4 and a fifth switch transistor T5, and the light emitting control end includes a first light emitting control end EM1 and a second light emitting control end EM2.

[0086] Referring to FIG. 3, the connection relationship between the fourth switch transistor T4 and other components is that the control end of the fourth switch transistor T4 is coupled with the first light emitting control end EM1, the first end of the fourth switch transistor T4 is coupled with the first power end ELVDD, and the second end of the fourth switch transistor T4 is coupled with the second electrode of the driving transistor TD.

[0087] In the implementation process, when the signal of the first light emitting control end EM1 is high, the fourth switch transistor T4 is turned on, and the first power end ELVDD is communicated with the second electrode of the driving transistor TD through the turned-on fourth switch transistor T4.

[0088] Referring to FIG. 3, the connection relationship between the fifth switch transistor T5 and other components is that the control end of the fifth switch transistor T5 is coupled with the second light emitting control end EM2, the first end of the fifth switch transistor T5 is coupled with the first electrode of the driving transistor TD, and the second end of the fifth switch transistor T5 is coupled with the anode of the light emitting device LED.

[0089] In the implementation process, when the signal of the second light emitting control end EM2 is high, the fifth switch transistor T5 is turned on, and the first electrode of the driving transistor TD is communicated with the anode of the light emitting device LED through the turned-on fifth switch transistor T5.

[0090] In addition, in an embodiment, referring to FIG. 3 and FIG. 6, the pixel driving circuit further comprises a first reset sub-circuit 50.

[0091] The first reset sub-circuit 50 is coupled with the anode of the light emitting device LED, and is configured to provide the initialization signal of the initialization signal terminal Vinit to the anode of the light emitting device LED in response to the signal of the reset signal terminal SC2.

[0092] In implementation, when the signal of the reset signal terminal SC2 is effective, the initialization signal of the initialization signal terminal Vinit is provided to the anode of the light emitting device LED through the first reset sub-circuit 50.

[0093] Exemplarily, referring to FIG. 3 and FIG. 6, the first reset sub-circuit 50 comprises a sixth switch transistor T6.

[0094] Referring to FIG. 3 and FIG. 6, the connection relationship between the sixth switch transistor T6 and other components is that the control terminal of the sixth switch transistor T6 is coupled with the reset signal terminal SC2, the first terminal of the sixth switch transistor T6 is coupled with the anode of the light emitting device LED, and the second terminal of the sixth switch transistor T6 is coupled with the initialization signal terminal Vinit.

[0095] In implementation, when the signal of the reset signal terminal SC2 is high level, the sixth switch transistor T6 is turned on, and the initialization signal of the initialization signal terminal Vinit is provided to the anode of the light emitting device LED through the turned-on sixth switch transistor T6, so as to reset the anode of the light emitting device LED.

[0096] In addition, exemplarily, referring to FIG. 4 and FIG. 7, the pixel driving circuit further comprises a second reset sub-circuit 60.

[0097] The second reset sub-circuit 60 is coupled with the first pole of the driving transistor TD, and is configured to provide the initialization signal of the initialization signal terminal Vinit to the first pole of the driving transistor TD in response to the signal of the reset signal terminal SC2.

[0098] In implementation, when the signal of the reset signal terminal SC2 is effective, the initialization signal of the initialization signal terminal Vinit is provided to the first pole of the driving transistor TD through the second reset sub-circuit 60.

[0099] Exemplarily, referring to FIG. 4 and FIG. 7, the second reset sub-circuit 60 comprises a seventh switch transistor T7.

[0100] Referring to FIG. 4 and FIG. 7, the connection relationship between the seventh switch transistor T7 and other components is as follows: the control terminal of the seventh switch transistor T7 is coupled with the reset signal terminal SC2, the first terminal of the seventh switch transistor T7 is coupled with the first electrode of the driving transistor TD, and the second terminal of the seventh switch transistor T7 is coupled with the initialization signal terminal Vinit.

[0101] In the implementation process, when the signal of the reset signal terminal SC2 is high, the seventh switch transistor T7 is turned on, and the initialization signal of the initialization signal terminal Vinit is provided to the first electrode of the driving transistor TD through the turned-on seventh switch transistor T7, so as to realize the reset of the first electrode of the driving transistor TD.

[0102] It needs to be further explained that the voltage value of the initialization signal is less than the voltage value of the reference voltage.

[0103] In the embodiment of the present application, in order to make the threshold voltage of the driving transistor TD gradually positive bias from negative value to zero, the voltage value of the initialization signal is less than the voltage value of the reference voltage, and at the same time, the voltage value of the initialization signal is also less than the voltage value of the first power supply terminal ELVDD. In this way, the voltage difference VBS between the first gate and the first electrode of the driving transistor TD in the initialization stage is Vref-Vinit, and under this voltage difference, the threshold voltage of the driving transistor TD of each pixel point is negative. After the driving transistor TD is turned on, with the voltage of the first electrode of the driving transistor TD being gradually pulled up by the first power supply terminal ELVDD, the voltage difference VBS between the above-mentioned first gate and first electrode gradually decreases, and the threshold voltage of the driving transistor TD will gradually positive bias from negative value, until the threshold voltage is zero, which can be regarded as the driving transistor TD being turned off. At this time, the voltage difference VBS between the first gate and the first electrode is stored and maintained by the first compensation capacitor C1, that is, the threshold voltage of the driving transistor TD is always maintained at zero.

[0104] The working process of the pixel driving circuit in the embodiment of the present application will be described in detail below in combination with FIG. 3 and FIG. 8.

[0105] Timing t1 stage: second light-emitting control terminal EM2=1, compensation signal terminal SC1=1, conduction signal terminal SC1=1, reset signal terminal SC2=1

[0106] When the signal of the reset signal terminal SC2 is high level, the sixth switch transistor T6 is turned on, and the initialization signal of the initialization signal terminal Vinit is provided to the anode of the light emitting device LED through the turned-on sixth switch transistor T6. It should be noted that, in order to prevent the light emitting device LED from being mistakenly turned on, the voltage difference between the above-mentioned initialization signal and the second power supply terminal ELVSS is less than the turn-on voltage of the light emitting device LED. When the signal of the second light emitting control terminal EM2 is high level, the fifth switch transistor T5 is turned on, and the initialization signal of the anode of the above-mentioned light emitting device LED is provided to the first electrode of the driving transistor TD through the turned-on fifth switch transistor T5. When the signal of the conduction signal terminal SCI is high level, the second switch transistor T2 is turned on, the first electrode of the driving transistor TD is communicated with the second gate of the driving transistor TD, and then the initialization signal is provided to the second gate of the driving transistor TD. When the signal of the compensation signal terminal SCI is high level, the first switch transistor T1 is turned on, and the reference voltage of the reference signal terminal Vref is provided to the first gate of the driving transistor TD. In addition, the voltage of the above-mentioned initialization signal is less than the voltage value of the first power supply terminal ELVDD, and the voltage of the above-mentioned initialization signal is also less than the reference voltage, so that the voltage difference between the first gate and the first electrode of the driving transistor TD is the difference between the reference voltage and the voltage of the initialization signal, at this time, the threshold voltage of each pixel point is negative, and the gate-source voltage Vgs of the driving transistor TD is 0, so that the driving transistor TD is turned on, and the above-mentioned initialization signal is provided to the second electrode of the driving transistor TD through the first electrode of the driving transistor TD.

[0107] Timing t2 stage: first light emitting control terminal EM1 = 1, compensation signal terminal SCI = 1, conduction signal terminal SCI = 1, reset signal terminal SC2 = 1

[0108] When the signal of the reset signal terminal SC2 is high level, the sixth switch transistor T6 is turned on, and the initialization signal of the initialization signal terminal Vinit is provided to the anode of the light emitting device LED through the turned-on sixth switch transistor T6. When the signal of the first light emitting control terminal EM1 is high level, the fourth switch transistor T4 is turned on, and the voltage of the first power supply terminal ELVDD is provided to the second electrode of the driving transistor TD through the turned-on fourth switch transistor T4, that is, the voltage of the second electrode of the driving transistor TD is pulled up to ELVDD. When the signal of the compensation signal terminal SC1 is high level, the first switch transistor T1 is turned on, and the reference voltage of the reference signal terminal Vref is provided to the first gate of the driving transistor TD. When the signal of the drive signal terminal SC1 is high level, the second switch transistor T2 is turned on, and the first electrode of the driving transistor TD is in communication with the second gate of the driving transistor TD, and the voltage levels of the first electrode and the second gate are equal. Since the driving transistor TD is in an open state, and the second switch transistor T2 is turned on, the voltages of the first electrode and the second gate of the driving transistor TD are gradually pulled up by the voltage of the first power supply terminal ELVDD. At this time, since the first gate of the driving transistor TD is the reference voltage, that is, a constant value, the voltage of the first electrode gradually rises, which gradually reduces the voltage difference between the first gate and the first electrode of the driving transistor TD from the original positive value Vref-Vinit, and further makes the threshold voltage of the driving transistor TD gradually positive bias from a negative value. When the threshold voltage of the driving transistor TD becomes zero, it is considered that the driving transistor TD is turned off, and the first compensation capacitor C1 stores the voltage difference VBS between the first gate and the first electrode when the threshold voltage is zero. Correspondingly, the voltages of the second gate and the first electrode are Vref-VBS.

[0109] Timing t3 stage: scan signal terminal Gate = 1, second light emitting control terminal EM2 = 1, reset signal terminal SC2 = 1

[0110] When the signal of the scanning signal terminal Gate is high, the third switch transistor T3 is turned on, and the data voltage of the data signal terminal Data is provided to the second gate of the driving transistor TD through the turned-on third switch transistor T3. When the signal of the reset signal terminal SC2 is high, the sixth switch transistor T6 is turned on, and the initialization signal of the initialization signal terminal Vinit is provided to the anode of the light emitting device LED through the turned-on sixth switch transistor T6. When the signal of the second light emitting control terminal EM2 is high, the fifth switch transistor T5 is turned on, and the initialization signal of the anode of the light emitting device LED is provided to the first pole of the driving transistor TD, i.e. the second end of the first compensation capacitor C1, through the turned-on fifth switch transistor T5. The first end of the first compensation capacitor C1 is vacant. Due to the coupling effect of the capacitor, the voltage of the first end of the first compensation capacitor C1, i.e. the first gate of the driving transistor TD, changes with the voltage of the first pole of the driving transistor TD, and the voltage of the first end of the first compensation capacitor C1 becomes Vinit+VBS. At this time, the voltage difference VBS between the first gate and the first pole of the driving transistor TD is unchanged, and correspondingly, the threshold voltage of the driving transistor TD is maintained at zero.

[0111] Timing t4 stage: first light emitting control terminal EM1=1, second light emitting control terminal EM2=1

[0112] When the signal of the first light emitting control terminal EM1 is high, the fourth switch transistor T4 is turned on, and the signal of the first power supply terminal ELVDD is communicated with the second pole of the driving transistor TD through the turned-on fourth switch transistor T4. When the signal of the second light emitting control terminal EM2 is high, the fifth switch transistor T5 is turned on, and the first pole of the driving transistor TD is communicated with the anode of the light emitting device LED through the turned-on fifth switch transistor T5, and the cathode of the light emitting device LED is communicated with the second power supply terminal ELVSS. In this stage, due to the first compensation capacitor C1 maintaining the voltage difference VBS between the first gate and the first pole of the driving transistor TD when the threshold voltage is zero, the second compensation capacitor C2 maintains the voltage difference Data-Vinit between the second gate and the first pole of the driving transistor TD. At this time, the driving current of the driving transistor TD is Id=1 / 2*W / L*Cox*μ*(Data-Vinit-Vth) 2 Since Vth=0, the above driving current is 1 / 2*W / L*Cox*μ*(Data-Vinit) 2 In this way, the driving currents between different pixel points are only affected by Data and Vinit, and Data and Vinit are fixed voltage values, so the driving currents of each pixel point are equal.

[0113] The working process of the pixel driving circuit in the embodiment of the application will be described in detail below in combination with FIG. 4 and FIG. 9.

[0114] Timing T1 stage: second light-emitting control terminal EM2 = 1, compensation signal terminal SC1 = 1, conduction signal terminal SC1 = 1, reset signal terminal SC2 = 1

[0115] When the signal of the reset signal terminal SC2 is high level, the seventh switch transistor T7 is turned on, and the initialization signal of the initialization signal terminal Vinit is provided to the first electrode of the driving transistor TD through the turned-on seventh switch transistor T7. It should be noted that, in order to prevent the light-emitting device LED from being mistakenly turned on, the voltage difference between the above-mentioned initialization signal and the second power supply terminal ELVSS is less than the turn-on voltage of the light-emitting device LED, i.e. Vinit-ELVSS < the turn-on voltage Von of the light-emitting device LED. When the signal of the second light-emitting control terminal EM2 is high level, the fifth switch transistor T5 is turned on, and the initialization signal of the first electrode of the above-mentioned driving transistor TD is provided to the anode of the light-emitting device LED through the turned-on fifth switch transistor T5. When the signal of the conduction signal terminal SC1 is high level, the second switch transistor T2 is turned on, and the first electrode of the driving transistor TD is communicated with the second gate of the driving transistor TD, thereby providing the initialization signal to the second gate of the driving transistor TD. When the signal of the compensation signal terminal SC1 is high level, the first switch transistor T1 is turned on, and the reference voltage of the reference signal terminal Vref is provided to the first gate of the driving transistor TD. In addition, the voltage of the above-mentioned initialization signal is less than the voltage value of the first power supply terminal ELVDD, and the voltage of the above-mentioned initialization signal is also less than the reference voltage, so that the voltage difference between the first gate and the first electrode of the driving transistor TD is the difference between the reference voltage and the voltage of the initialization signal, and at this time, the threshold voltage of each pixel point is negative, and the gate-source voltage Vgs of the driving transistor TD is zero, so that the driving transistor TD is turned on, and the above-mentioned initialization signal is provided to the second electrode of the driving transistor TD through the first electrode of the driving transistor TD.

[0116] Timing T2 stage: first light-emitting control terminal EM1 = 1, compensation signal terminal SC1 = 1, conduction signal terminal SC1 = 1

[0117] When the signal of the compensation signal terminal SC1 is high, the first switch transistor T1 is turned on, and the reference voltage of the reference signal terminal Vref is provided to the first gate of the driving transistor TD. When the signal of the first light emitting control terminal EM1 is high, the fourth switch transistor T4 is turned on, and the voltage of the first power supply terminal ELVDD is provided to the second electrode of the driving transistor TD through the turned-on fourth switch transistor T4, i.e., the voltage of the second electrode of the driving transistor TD is gradually pulled up to ELVDD. When the signal of the driving signal terminal SC1 is high, the second switch transistor T2 is turned on, and the first electrode of the driving transistor TD is in communication with the second gate of the driving transistor TD, and the voltages of the first electrode and the second gate are equal. Since the driving transistor TD is in an open state, the voltages of the first electrode and the second gate of the driving transistor TD are gradually pulled up by the voltage of the first power supply terminal ELVDD. At this time, since the first gate of the driving transistor TD is the reference voltage, i.e., a constant value, the voltage of the first electrode gradually rises, which gradually reduces the voltage difference between the first gate and the first electrode of the driving transistor TD from the original positive value Vref-Vinit, and further gradually positively biases the threshold voltage of the driving transistor TD from a negative value. When the threshold voltage of the driving transistor TD becomes zero, it is considered that the driving transistor TD is turned off, and the first compensation capacitor C1 stores the voltage difference VBS between the first gate and the first electrode when the threshold voltage is zero. Correspondingly, the voltages of the second gate and the first electrode are Vref-VBS.

[0118] Timing T3 stage: the scanning signal terminal Gate = 1, the second light emitting control terminal EM2 = 1, and the reset signal terminal SC2 = 1

[0119] When the signal of the scanning signal terminal Gate is high, the third switch transistor T3 is turned on, and the data voltage of the data signal terminal Data is provided to the second gate of the driving transistor TD through the turned-on third switch transistor T3. When the signal of the reset signal terminal SC2 is high, the seventh switch transistor T7 is turned on, and the initialization signal of the initialization signal terminal Vinit is provided to the first electrode of the driving transistor TD through the turned-on seventh switch transistor T7. When the signal of the second light emitting control terminal EM2 is high, the fifth switch transistor T5 is turned on, and the initialization signal of the first electrode of the driving transistor TD is provided to the anode of the light emitting device LED through the turned-on fifth switch transistor T5. The first end of the first compensation capacitor C1 is vacant. Due to the coupling effect of the capacitor, the voltage of the first end of the first compensation capacitor C1, i.e., the voltage of the first gate of the driving transistor TD, will change with the voltage of the first electrode of the driving transistor TD. At this time, the voltage of the first end of the first compensation capacitor C1 is Vinit+VBS, the VBS between the first gate and the first electrode of the driving transistor TD remains unchanged, and correspondingly, the threshold voltage of the driving transistor TD maintains zero.

[0120] Timing T4 stage: the first light-emitting control end EM1 = 1, the second light-emitting control end EM2 = 1

[0121] When the signal of the first light-emitting control end EM1 is high, the fourth switch transistor T4 is turned on, and the signal of the first power supply end ELVDD is communicated with the second electrode of the driving transistor TD through the turned-on fourth switch transistor T4. When the signal of the second light-emitting control end EM2 is high, the fifth switch transistor T5 is turned on, the first electrode of the driving transistor TD is communicated with the anode of the light-emitting device LED through the turned-on fifth switch transistor T5, and the cathode of the light-emitting device LED is communicated with the second power supply end ELVSS. In this stage, since the first compensation capacitor C1 maintains the voltage difference VBS between the first gate and the first electrode when the threshold voltage is zero, and the second compensation capacitor C2 maintains the voltage difference Data-Vinit between the second gate and the first electrode. At this time, the driving current of the driving transistor TD is Id = 1 / 2 * W / L * Cox * mu * (Data-Vinit-Vth) 2 Since Vth = 0, the above driving current is 1 / 2 * W / L * Cox * mu * (Data-Vinit) 2 In this way, the driving currents between different pixel points are only affected by Data and Vinit, and Data and Vinit are fixed voltage values, so the driving currents of each pixel point are equal.

[0122] Based on the same inventive concept, the embodiment of the present application provides a display device, which comprises the pixel driving circuit of any one of the above.

[0123] In the embodiment of the present application, the display device can be any product or component with display function, such as mobile phone, tablet computer, television, display, notebook computer, digital photo frame, navigator, etc. Other essential components of the display device should be understood by those skilled in the art, and will not be described here, and should not be regarded as a limitation on the present application.

[0124] Based on the same inventive concept, the embodiment of the present application provides a driving method of the pixel driving circuit, which is shown in FIG. 10, and comprises the following steps:

[0125] Step 201: first stage: threshold compensation sub-circuit 10 provides the reference voltage of the reference signal end Vref to the first gate of the driving transistor TD in response to the signal of the compensation signal end SC1; the first reset sub-circuit 50 provides the initialization signal of the initialization signal end Vinit to the anode of the light emitting device LED and to the first electrode of the driving transistor TD through the light emitting control sub-circuit 40 in response to the signal of the reset signal end SC2, or the second reset sub-circuit 60 provides the initialization signal of the initialization signal end Vinit to the first electrode of the driving transistor TD in response to the signal of the reset signal end SC2; the turn-on control sub-circuit 20 communicates the second gate of the driving transistor TD with the first electrode of the driving transistor TD in response to the signal of the turn-on signal end SC1, and provides the initialization signal of the first electrode of the driving transistor TD to the second gate of the driving transistor TD; the driving transistor TD is turned on, and the initialization signal of the first electrode of the driving transistor TD is provided to the second electrode of the driving transistor TD through the turned-on driving transistor TD.

[0126] Step 202: second stage: the turn-on control sub-circuit 20 communicates the second gate of the driving transistor TD with the first electrode of the driving transistor TD in response to the signal of the turn-on signal end SC1, and the potentials of the first electrode and the second gate of the driving transistor TD are equal; the gate-source of the driving transistor TD is reset in the process that the first voltage signal of the first power supply end ELVDD is provided to the second electrode of the driving transistor TD, and the threshold voltage of the driving transistor TD is obtained as zero in the reset process, and the voltage difference between the first gate and the first electrode is obtained and stored in the first compensation capacitor C1.

[0127] Step 203: third stage: the data writing sub-circuit 30 provides the data voltage of the data signal end Data to the second gate of the driving transistor TD in response to the signal of the scanning signal end Gate, and the first reset sub-circuit 50 provides the initialization signal of the initialization signal end Vinit to the anode of the light emitting device LED and provides the initialization signal to the first electrode of the driving transistor TD through the light emitting control sub-circuit 40 in response to the signal of the reset signal end SC2, or the second reset sub-circuit 60 provides the initialization signal of the initialization signal end Vinit to the first electrode of the driving transistor TD in response to the signal of the reset signal end SC2, so that the first compensation capacitor C1 maintains the voltage difference, and the voltage difference of the second compensation capacitor C2 is the voltage difference between the data voltage and the initialization signal.

[0128] Step 204: fourth stage: the driving transistor TD generates a driving current according to the data voltage, and the light emitting control sub-circuit 40 provides the driving current to the light emitting device LED in response to the signal of the light emitting control end.

[0129] In summary, in the embodiment of the present application, the pixel driving circuit, the display device and the driving method are provided. The pixel driving circuit comprises a driving transistor, a threshold compensation sub-circuit, a conduction control sub-circuit, a first compensation capacitor, a data writing sub-circuit, a second compensation capacitor, a light emitting control sub-circuit and a light emitting device. The driving transistor is a double-gate transistor. The threshold compensation sub-circuit is coupled with the first gate of the driving transistor and is configured to provide a reference voltage of a reference signal end to the first gate in response to a signal of a compensation signal end. The conduction control sub-circuit is coupled with the second gate of the driving transistor and is configured to communicate the second gate of the driving transistor with the first electrode of the driving transistor in response to a signal of a conduction signal end. The first end of the first compensation capacitor is coupled with the first gate, and the second end of the first compensation capacitor is coupled with the first electrode of the driving transistor. The data writing sub-circuit is coupled with the second gate of the driving transistor and is configured to provide a data voltage of a data signal end to the second gate of the driving transistor in response to a signal of a scanning signal end. The first end of the second compensation capacitor is coupled with the second gate, and the second end of the second compensation capacitor is coupled with a setting node. The setting node is the first electrode of the driving transistor or the anode of the light emitting device. The driving transistor is configured to generate a driving current according to the data voltage. The light emitting control sub-circuit is coupled with the second electrode of the driving transistor, the first electrode of the driving transistor and the anode of the light emitting device respectively and is configured to provide the driving current to the light emitting device in response to a signal of a light emitting control end. The voltage difference between the first gate and the first electrode of the driving transistor when the threshold voltage is zero is obtained through the threshold compensation sub-circuit, and the voltage difference is saved and maintained through the first compensation capacitor. In this way, the threshold voltage can also be maintained at zero value, and the influence of the threshold voltage on the generation of the driving current of each pixel point is eliminated, thereby effectively ensuring the uniformity of the driving current and improving the display effect of the picture.

[0130] Those skilled in the art will understand that the embodiments of the present application can be provided as a method, a system, or a computer program product system. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product system implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0131] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks or in conjunction with the flowcharts.

[0132] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks or in conjunction with the flowcharts.

[0133] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks or in conjunction with the flowcharts.

[0134] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A pixel driving circuit, wherein, include: The system comprises a driving transistor, a threshold compensation sub-circuit, a conduction control sub-circuit, a first compensation capacitor, a data writing sub-circuit, a second compensation capacitor, a light emission control sub-circuit, and a light emission device, wherein the driving transistor is a dual-gate transistor. The threshold compensation sub-circuit is coupled to the first gate of the driving transistor and is configured to provide a reference voltage from the reference signal terminal to the first gate in response to a signal from the compensation signal terminal. The conduction control sub-circuit is coupled to the second gate of the driving transistor and is configured to connect the second gate of the driving transistor to the first terminal of the driving transistor in response to a signal at the conduction signal terminal. The first end of the first compensation capacitor is coupled to the first gate, and the second end of the first compensation capacitor is coupled to the first terminal of the driving transistor. The data writing sub-circuit is coupled to the second gate of the driving transistor and is configured to provide the data voltage of the data signal terminal to the second gate of the driving transistor in response to a signal at the scan signal terminal. The first end of the second compensation capacitor is coupled to the second gate, and the second end of the second compensation capacitor is coupled to a set node, wherein the set node is the first electrode of the driving transistor or the anode of the light-emitting device; The driving transistor is configured to generate a driving current based on the data voltage; The light-emitting control sub-circuit is coupled to the second terminal of the driving transistor, the first terminal of the driving transistor, and the anode of the light-emitting device, and is configured to provide the driving current to the light-emitting device in response to a signal from the light-emitting control terminal.

2. The pixel driving circuit as described in claim 1, wherein, The threshold compensation sub-circuit includes: a first switching transistor; The control terminal of the first switching transistor is coupled to the compensation signal terminal, the first terminal of the first switching transistor is coupled to the first gate of the driving transistor, and the second terminal of the first switching transistor is coupled to the reference signal terminal.

3. The pixel driving circuit as described in claim 1, wherein, The conduction control sub-circuit includes: a second switching transistor; The control terminal of the second switching transistor is coupled to the conduction signal terminal, the first terminal of the second switching transistor is coupled to the second gate of the driving transistor, and the second terminal of the second switching transistor is coupled to the first terminal of the driving transistor.

4. The pixel driving circuit as described in claim 1, wherein, The data writing sub-circuit includes: a third switching transistor; The control terminal of the third switching transistor is coupled to the scan signal terminal, the first terminal of the third switching transistor is coupled to the data signal terminal, and the second terminal of the third switching transistor is coupled to the second gate of the driving transistor.

5. The pixel driving circuit as described in claim 1, wherein, The light-emitting control sub-circuit includes a fourth switching transistor and a fifth switching transistor, and the light-emitting control terminal includes a first light-emitting control terminal and a second light-emitting control terminal. The control terminal of the fourth switching transistor is coupled to the first light-emitting control terminal, the first terminal of the fourth switching transistor is coupled to the first power supply terminal, and the second terminal of the fourth switching transistor is coupled to the second terminal of the driving transistor. The control terminal of the fifth switching transistor is coupled to the second light-emitting control terminal, the first terminal of the fifth switching transistor is coupled to the first electrode of the driving transistor, and the second terminal of the fifth switching transistor is coupled to the anode of the light-emitting device.

6. The pixel driving circuit according to any one of claims 1 to 5, wherein, It also includes the first reset circuit; The first reset sub-circuit is coupled to the anode of the light-emitting device and is configured to provide an initialization signal from the initialization signal terminal to the anode of the light-emitting device in response to a signal from the reset signal terminal.

7. The pixel driving circuit as described in claim 6, wherein, The first reset circuit includes: a sixth switching transistor; The control terminal of the sixth switching transistor is coupled to the reset signal terminal, the first terminal of the sixth switching transistor is coupled to the anode of the light-emitting device, and the second terminal of the sixth switching transistor is coupled to the initialization signal terminal.

8. The pixel driving circuit according to any one of claims 1 to 5, wherein, It also includes a second reset circuit; The second reset sub-circuit is coupled to the first terminal of the driving transistor and is configured to provide an initialization signal from the initialization signal terminal to the first terminal of the driving transistor in response to a signal from the reset signal terminal.

9. The pixel driving circuit as described in claim 8, wherein, The second reset circuit includes: a seventh switching transistor; The control terminal of the seventh switching transistor is coupled to the reset signal terminal, the first terminal of the seventh switching transistor is coupled to the first terminal of the driving transistor, and the second terminal of the seventh switching transistor is coupled to the initialization signal terminal.

10. The pixel driving circuit according to any one of claims 6 to 9, wherein, The voltage value of the initialization signal is less than the voltage value of the reference voltage.

11. A display device, wherein, include: The pixel driving circuit as described in any one of claims 1 to 10.

12. A driving method for a pixel driving circuit as described in any one of claims 1 to 10, wherein, include: First stage: The threshold compensation sub-circuit responds to the signal at the compensation signal terminal and provides the reference voltage at the reference signal terminal to the first gate of the driving transistor; The first reset sub-circuit responds to the signal at the reset signal terminal by providing the initialization signal at the initialization signal terminal to the anode of the light-emitting device, and then provides it to the first terminal of the driving transistor via the light-emitting control sub-circuit. Alternatively, the second reset sub-circuit responds to the signal at the reset signal terminal by providing the initialization signal at the initialization signal terminal to the first terminal of the driving transistor. The turn-on control sub-circuit responds to the signal at the turn-on signal terminal by connecting the second gate of the driving transistor to the first terminal of the driving transistor, and provides the initialization signal of the first terminal of the driving transistor to the second gate of the driving transistor. The driving transistor is turned on, and the initialization signal of the first terminal of the driving transistor is provided to the second terminal of the driving transistor via the turned-on driving transistor. Second stage: In response to the signal at the conduction signal terminal, the conduction control sub-circuit connects the second gate of the driving transistor with the first terminal of the driving transistor, and the potentials of the first terminal and the second gate of the driving transistor are equal; during the process of the first voltage signal at the first power supply terminal being provided to the second terminal of the driving transistor, the gate-source of the driving transistor is reset. During the reset process, the threshold voltage of the driving transistor is found to be zero, and the voltage difference between the first gate and the first terminal is obtained, and the voltage difference is stored in the first compensation capacitor; Third stage: The data writing sub-circuit responds to the signal at the scan signal terminal by providing the data voltage at the data signal terminal to the second gate of the driving transistor; and the first reset sub-circuit responds to the signal at the reset signal terminal by providing the initialization signal at the initialization signal terminal to the anode of the light-emitting device, and the initialization signal is provided to the first terminal of the driving transistor via the light-emitting control sub-circuit; or, the second reset sub-circuit responds to the signal at the reset signal terminal by providing the initialization signal at the initialization signal terminal to the first terminal of the driving transistor, thereby causing the first compensation capacitor to maintain the voltage difference; and the voltage difference of the second compensation capacitor is the voltage difference between the data voltage and the initialization signal. Fourth stage: The driving transistor generates a driving current based on the data voltage, and the light-emitting control sub-circuit responds to the signal at the light-emitting control terminal by providing the driving current to the light-emitting device.

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