Pixel driving circuit, driving method thereof, display panel and display device

Abstract

The invention discloses a pixel driving circuit, a driving method thereof, a display panel and a display device. The pixel driving circuit comprises a storage coupling module, a compensation module, a driving control module and a light emitting module, the storage coupling module outputs a coupling signal to the compensation module in response to a voltage difference between a power supply voltage and a first preset voltage; the compensation module responds to a data signal input by the input end for receiving the coupling signal and the data signal and outputs a driving signal to the driving control module; the driving control module responds to the received driving signal and drives the light-emitting module according to the first preset voltage and the data signal. Thus, through the arrangement of the storage coupling module, when the driving control module drives the light-emitting module, the brightness of the light-emitting module is related to the first preset voltage and the data signal and is irrelevant to the power supply voltage, so that the influence of the voltage drop on the power supply wiring on the brightness of the light-emitting module is avoided, and the display effect of the LED display device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a pixel driving circuit, a driving method thereof, a display panel and a display device. BACKGROUND

[0002] In an LED display device, each LED is driven by current, and the brightness of the LED will also be different under the driving of different currents. In an LED display product provided with a compensation module, the current size of the driving transistor in the saturation region is I = 1 / 2 x μ x C ox x W / L x (DATA-VDD)2, wherein μ, C ox , W and L are all parameters related to the driving transistor, DATA is a data signal, and VDD is a power supply voltage. It can be seen from the formula that the saturation current of the driving transistor depends on the data signal and the power supply voltage.

[0003] However, the power supply voltage of the LED display device is provided by a power supply wire to each LED, and the power supply wire inevitably has a voltage drop, which will result in that the power supply voltages received by the LEDs at different positions are different, so that the currents for driving the LEDs at different positions are different, thereby causing the brightness difference of the LEDs at different positions and reducing the display effect of the LED display device.

[0004] Therefore, how to improve the display effect of the LED display device becomes a technical problem to be solved in the field. SUMMARY

[0005] Embodiments of the present application provide a pixel driving circuit, a driving method thereof, a display panel and a display device, so as to improve the display effect of the LED display device.

[0006] In a first aspect, the embodiments of the present application provide a pixel driving circuit, comprising: a storage coupling module, a compensation module, a driving control module and a light emitting module.

[0007] The storage coupling module is connected with the compensation module, and the storage coupling module is configured to output a coupling signal to the compensation module in response to a voltage difference between a power supply voltage input by an input end of the power supply voltage and a first preset voltage input by an input end of the first preset voltage.

[0008] The compensation module is connected with the driving control module, and the compensation module is configured to output a driving signal to the driving control module in response to a data signal input by an input end of the data signal received by the coupling signal and the data signal.

[0009] The driving control module is connected with the light-emitting module and the input end of the power voltage respectively, and is configured to drive the light-emitting module according to the first preset voltage and the data signal in response to receiving the driving signal.

[0010] In a second aspect, the embodiment of the present application provides a driving method of the pixel driving circuit as described in the first aspect, comprising:

[0011] The storage coupling module outputs a coupling signal to the compensation module in response to a voltage difference between the power voltage input from the input end of the power voltage and the first preset voltage input from the input end of the first preset voltage;

[0012] The compensation module outputs a driving signal to the driving control module in response to the data signal input from the input end of the coupling signal and the data signal;

[0013] The driving control module drives the light-emitting module according to the first preset voltage and the data signal in response to receiving the driving signal.

[0014] In a third aspect, the embodiment of the present application provides a display panel comprising the pixel driving circuit as described in the first aspect.

[0015] In a fourth aspect, the embodiment of the present application provides a display device comprising the display panel as described in the third aspect.

[0016] The present application has the following advantages:

[0017] The pixel driving circuit, the driving method thereof, the display panel and the display device provided by the embodiment of the present application comprise a storage coupling module, a compensation module, a driving control module and a light-emitting module. The storage coupling module is connected with the compensation module, and outputs a coupling signal to the compensation module in response to a voltage difference between a power voltage input from the input end of the power voltage and a first preset voltage input from the input end of the first preset voltage. The compensation module is connected with the driving control module, and outputs a driving signal to the driving control module in response to a data signal input from the input end of the coupling signal and the data signal. The driving control module is connected with the light-emitting module and the input end of the power voltage respectively, and drives the light-emitting module according to the first preset voltage and the data signal in response to receiving the driving signal. In this way, by setting the storage coupling module, the brightness of the light-emitting module is related to the first preset voltage and the data signal when the driving control module drives the light-emitting module, and is irrelevant to the power voltage, thereby avoiding the influence of the voltage drop on the power supply line on the brightness of the light-emitting module, and improving the driving effect of the pixel driving circuit. When the pixel driving circuit is applied to an LED display device, the display effect of the LED display device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 This is a schematic diagram of a pixel driving circuit provided in an embodiment of the present invention;

[0019] Figure 2 This is a circuit diagram of a pixel driving circuit provided in an embodiment of the present invention;

[0020] Figure 3 This is a curve showing the variation of various control voltages in a pixel driving circuit provided in an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of another pixel driving circuit provided in an embodiment of the present invention;

[0022] Figure 5 This is a circuit diagram of another pixel driving circuit provided in an embodiment of the present invention;

[0023] Figure 6 This is a curve showing the variation of each control voltage in another pixel driving circuit provided in this embodiment of the invention.

[0024] Figure 7 This is a flowchart of a driving method provided in an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention;

[0026] Figure 9 This is a schematic diagram of another display panel provided in an embodiment of the present invention;

[0027] Figure 10 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Detailed Implementation

[0028] The following description, in conjunction with the accompanying drawings, details a pixel driving circuit, its driving method, and a display panel and display device provided by embodiments of the present invention. It should be noted that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] This invention provides a pixel driving circuit, such as... Figure 1 As shown, it includes: a storage coupling module 100, a compensation module 200, a drive control module 300, and a light-emitting module 400;

[0030] The storage coupling module 100 is connected to the compensation module 200. The storage coupling module 100 is used to output a coupling signal ΔV to the compensation module 200 in response to the voltage difference between the power supply voltage VDD input to the input terminal of the power supply voltage VDD and the first preset voltage V1 input to the input terminal of the first preset voltage V1.

[0031] The compensation module 200 is connected to the drive control module 300. The compensation module 200 is used to: output a drive signal D to the drive control module 300 in response to the data signal DATA input at the input terminal of receiving the coupling signal ΔV and the data signal DATA.

[0032] The drive control module 300 is connected to the light-emitting module 400 and the input terminal of the power supply voltage VDD. The drive control module 300 is used to: drive the light-emitting module 400 in response to receiving the drive signal D, according to the first preset voltage V1 and the data signal DATA.

[0033] Thus, by setting up a storage coupling module, the brightness of the light-emitting module is related to the first preset voltage and data signal when the drive control module drives the light-emitting module, but is independent of the power supply voltage. This avoids the influence of voltage drop on the light-emitting module brightness on the power supply line, thereby improving the driving effect of the pixel driving circuit. When the pixel driving circuit is applied to an LED display device, it improves the display effect of the LED display device.

[0034] The following section will introduce each module in the pixel driving circuit.

[0035] 1. Storage coupling module.

[0036] like Figure 2 As shown, the storage coupling module 100 includes: a first transistor T1 and a second transistor T2; the input terminal of the first transistor T1 is connected to the input terminal of a first preset voltage V1, and the output terminal of the first transistor T1 is connected to the output terminal A of the storage coupling module; the input terminal of the second transistor T2 is connected to the input terminal of the power supply voltage VDD, and the output terminal of the second transistor T2 is connected to the output terminal A of the storage coupling module. The output terminal A of the storage coupling module is connected to the compensation module 200.

[0037] Thus, when the first transistor is turned on, the first preset voltage can be applied to the output terminal of the storage coupling module, and when the second transistor is turned on, the power supply voltage can be applied to the output terminal of the storage coupling module, thereby enabling the output terminal of the storage coupling module to output a coupling signal to the compensation module.

[0038] Furthermore, such as Figure 2As shown, the control terminal of the first transistor T1 is connected to the input terminal of the first gate signal G1, and the control terminal of the second transistor T2 is connected to the input terminal of the second gate signal G2, and the first gate signal G1 and the second gate signal G2 are out of phase.

[0039] Thus, by setting the first gate signal and the second gate signal to be out of phase, the first preset voltage and the power supply voltage can be applied to the output of the storage coupling module in sequence, thereby causing a jump from the first preset voltage to the power supply voltage at the output of the storage coupling module. This jump is then output as a coupling signal to the compensation module, thereby improving the display effect of the LED display device through the storage coupling module.

[0040] Optionally, at least one of the first transistor and the second transistor is an oxide thin-film transistor. Thus, since both the first and second transistors function as switches and do not need to carry large currents, oxide thin-film transistors can be used to reduce leakage current, improve the reliability of the pixel driving circuit, and consequently improve the display effect of the LED display device when the pixel driving circuit is applied.

[0041] 2. Compensation module.

[0042] like Figure 2 As shown, the compensation module 200 includes: a compensation capacitor C st Transistor T4 and transistor T5; compensation capacitor C st The two ends of the transistor are connected to the storage coupling module 100 and the output of the fourth transistor T4, respectively; the input of the fourth transistor T4 is connected to the drive control module 300, the output of the fourth transistor T4 is connected to the drive control module 300, and the control of the fourth transistor T4 is connected to the input of the third gate signal G3; the input of the fifth transistor T5 is connected to the input of the data signal DATA, the output of the fifth transistor T5 is connected to the drive control module 300, and the control of the fifth transistor T5 is connected to the input of the third gate signal G3.

[0043] Thus, by setting up a compensation module, the drive current output by the drive control circuit can be compensated, thereby eliminating the afterimage of the previous frame of the light-emitting module when the drive current drives the light-emitting module to emit light. This allows the compensated drive current to drive the light-emitting module to emit light uniformly, improving the performance of the pixel drive circuit and enhancing the uniformity of the LED display device.

[0044] 3. Drive control module.

[0045] like Figure 2As shown, the drive control module 300 includes: a sixth transistor T6, a seventh transistor T7, and a drive transistor TD; the input terminal of the sixth transistor T6 is connected to the input terminal of the power supply voltage VDD, the output terminal of the sixth transistor T6 is connected to the input terminal of the drive transistor TD, and the control terminal of the sixth transistor T6 is connected to the input terminal of the second gate signal G2; the input terminal of the seventh transistor T7 is connected to the output terminal of the drive transistor TD, the output terminal of the seventh transistor T7 is connected to the light-emitting module 400, and the control terminal of the seventh transistor T7 is connected to the input terminal of the second gate signal G2; the input terminal, the output terminal, and the control terminal of the drive transistor TD are respectively connected to the compensation module 200.

[0046] Among them, such as Figure 2 As shown, the compensation module 200 includes a compensation capacitor C. st When the fourth transistor T4 and the fifth transistor T5 are connected, the input terminal of the driving transistor TD is connected to the output terminal of the fifth transistor T5, the output terminal of the driving transistor TD is connected to the input terminal of the fourth transistor T4, and the control terminal of the driving transistor TD is connected to the output terminal of the fourth transistor T4.

[0047] Thus, by setting up a drive control module, the driving current required for the light-emitting module to light up can be provided, and the lighting and extinguishing of the light-emitting module can be controlled.

[0048] 4. Reset module.

[0049] like Figure 1 As shown, the pixel driving circuit may further include a reset module 500, which is connected to the compensation module 200, the driving control module 300, and the light-emitting module 400 respectively. The reset module 500 is used to reset the potential in the compensation module 200, the driving control module 300, and the light-emitting module 400 during the reset phase.

[0050] like Figure 2 As shown, the reset module 500 includes an eighth transistor T8 and a ninth transistor T9. The input terminal of the eighth transistor T8 is connected to the initial voltage V. init The input terminal of the eighth transistor T8 is connected to the compensation module 200, and the control terminal of the eighth transistor T8 is connected to the reset voltage V. R The input terminal of the ninth transistor T9 is connected to the initial voltage V. init The input terminal of the ninth transistor T9 is connected to the input terminal, and the output terminal of the ninth transistor T9 is connected to the drive control module 300 and the light-emitting module 400 respectively. The control terminal of the ninth transistor T9 is connected to the reset voltage V. R The input terminal is connected.

[0051] Thus, by setting a reset module, the compensation module, drive control module, and light-emitting module are reset before driving the light-emitting module, so that the pixel driving circuit returns to its initial state, thereby eliminating the residual charge in the pixel driving circuit after driving the previous frame, improving the reliability of the pixel driving circuit, and thus improving the display effect of the LED display device.

[0052] 5. Light-emitting module.

[0053] like Figure 2 As shown, the light-emitting module 400 includes light-emitting LEDs. The input terminal of the light-emitting LEDs is connected to the drive control module 300, and the output terminal of the light-emitting LEDs is connected to the low-voltage terminal VSS. The types of light-emitting LEDs include, but are not limited to, Mini LEDs, Micro LEDs, and OLEDs. One or more light-emitting LEDs can be used, and when only one is used, the LEDs can be connected in parallel or in series.

[0054] Thus, the pixel driving circuit can be used to drive different types of light-emitting LEDs. Of course, when driving different types of light-emitting LEDs, the parameters of each device in the pixel driving circuit may be adjusted accordingly. For example, when the driving current of the light-emitting LED in the light-emitting module is large, the required capacitance value of the compensation capacitor will also be large. Therefore, the parameters of each device can be adjusted according to actual needs, without specific limitations.

[0055] The following is combined with Figure 2 The structure shown illustrates the working principle of the pixel driving circuit.

[0056] The control electrode voltage changes of each transistor in the pixel driving circuit are as follows: Figure 3 As shown, the operation of the pixel driving circuit in a frame includes: a reset stage, a compensation stage, and a light emission stage.

[0057] First, during the reset phase, the reset voltage V R By controlling the conduction of the eighth transistor T8 and the ninth transistor T9, the voltages at nodes M and N are reset to the initial voltage V. init And the initial voltage V init It can control the driving transistor TD to turn on, thereby resetting the driving transistor TD; the first gate signal G1 controls the first transistor T1 to turn on, thereby setting the voltage of the output terminal A of the storage coupling module to the first preset voltage V1; the second gate voltage G2 controls the second transistor T2, the sixth transistor T6 and the seventh transistor T7 to turn off, and the third gate voltage G3 controls the fourth transistor T4 and the fifth transistor T5 to turn off.

[0058] Next, during the compensation phase, the third gate voltage G3 controls the fourth transistor T4 and the fifth transistor T5 to turn on, thereby inputting the data signal DATA to node P. That is, the voltage at node P is DATA. When the threshold voltage of the driving transistor TD is Vth, the voltage at node M is DATA + Vth. The first gate signal G1 still controls the first transistor T1 to turn on; the reset voltage V... R The eighth transistor T8 and the ninth transistor T9 are turned off, and the second gate voltage G2 controls the second transistor T2, the sixth transistor T6 and the seventh transistor T7 to turn off.

[0059] Then, during the light-emitting stage, the first gate signal G1 controls the first transistor T1 to turn off, and the second gate voltage G2 controls the second transistor T2 to turn on, thereby causing the voltage at the output terminal A of the storage coupling module to jump from the first preset voltage V1 to the power supply voltage VDD, that is, the voltage change at the output terminal A of the storage coupling module is VDD-V1, and the voltage at the compensation capacitor C... st Under the coupling effect, the voltage change at node M is also VDD-V1, so the voltage at node M is DATA+Vth+VDD-V1; the second gate voltage controls the sixth transistor T6 and the seventh transistor T7 to conduct, so the power supply voltage VDD is input to node P, that is, the voltage at node P is VDD; the reset voltage V R The eighth transistor T8 and the ninth transistor T9 are turned off, and the third gate voltage G3 controls the fourth transistor T4 and the fifth transistor T5 to turn off.

[0060] Furthermore, during the light-emitting stage, the driving current for the light-emitting module 400 is the current flowing through the driving transistor TD, so the driving current can be expressed as:

[0061] I = 1 / 2 × μ × C ox ×W / L×(Vgs-Vth)2

[0062] Where I is the drive current, μ is the effective carrier mobility of the drive transistor TD, and C ox Let Vgs be the capacitance per unit area of ​​the gate oxide of the driving transistor, W be the width of the channel of the driving transistor TD, L be the length of the channel of the driving transistor TD, and Vgs be the difference between the gate voltage Vg and the source voltage Vs of the driving transistor TD. Since the gate voltage of the driving transistor TD is the voltage of node M, Vg = DATA + Vth + VDD - V1. The source voltage of the driving transistor TD is the voltage of node P, so Vs = VDD. Therefore:

[0063] Vgs=DATA+Vth+VDD-V1-VDD=DATA+Vth-V1

[0064] At this point, the drive current can be expressed as:

[0065] I = 1 / 2 × μ × C ox ×W / L×(DATA+Vth-V1-Vth)2

[0066] The driving current can be expressed by the following formula:

[0067] I = 1 / 2 × μ × C ox ×W / L×(DATA-V1)2

[0068] As can be seen from Formula 1, the driving current is only related to the data signal DATA and the first preset voltage V1, in addition to the parameters of the driving transistor TD itself, and is not related to the power supply voltage VDD. This eliminates the influence of the voltage drop of the power supply voltage VDD on the driving current, thereby improving the driving effect of the pixel driving circuit on the light-emitting module. When the pixel driving circuit is applied to LED display devices, it improves the display effect of the LED display device.

[0069] In addition, when the driving transistor is a P-type transistor, Vgs needs to be less than Vth for the driving transistor to turn on, that is, the first preset voltage V1 is greater than the data signal DATA. Therefore, when the driving transistor is a P-type transistor, the first preset voltage V1 should always be greater than the data signal DATA. Correspondingly, when the driving transistor is an N-type transistor, the first preset voltage V1 should always be less than the data signal DATA.

[0070] 6. Data scanning module.

[0071] like Figure 4 As shown, the pixel driving circuit also includes a data scanning module 600, which is located between the compensation module 200 and the input terminal of the data signal DATA. The data scanning module 600 is used to: in response to receiving the data signal DATA, store the data signal DATA and output the data signal DATA to the compensation module 200 during the compensation phase.

[0072] Thus, by setting up a data scanning module, the stored data signal can be input in advance when the previous row of LEDs is emitting light, reducing the delay in the data signal input process when driving the current row of light-emitting units, thereby reducing the black insertion time between two rows, improving the performance of the pixel driving circuit, and improving the display effect of the LED display device.

[0073] Furthermore, such as Figure 5As shown, the data scanning module 600 includes: a third transistor T3 and a first capacitor C1; the input terminal of the third transistor T3 is connected to the input terminal of the data signal DATA, the output terminal of the third transistor T3 is connected to the output terminal B of the data scanning module, and the control terminal of the third transistor T3 is connected to the input terminal of the data scanning signal S; the two ends of the first capacitor C1 are respectively connected to the input terminal of the second preset voltage V2 and the output terminal B of the data scanning module.

[0074] Thus, under the control of the data scanning signal, the data signal can be input to the output of the data scanning module during the light-up stage of the previous row, and the magnitude of the data signal is maintained by the first capacitor. During the compensation stage of the current row, the data signal is input from the output of the data scanning module to the compensation module, thereby reducing the time for the data signal to be input to the pixel driving circuit during the current row, reducing the black insertion time between lighting up the previous row and lighting up the current row, and improving the display effect of the LED display device.

[0075] Specifically, such as Figure 6 As shown, the curve of the data scan signal S can be seen. The low level on the left is the low level during the light emission stage of the previous row, which is used to control the third transistor of the current row to turn on. The low level on the right is the low level during the light emission stage of the current row, which can control the third transistor of the next row to turn on.

[0076] Optionally, the second preset voltage is the initial voltage. This eliminates the need for additional voltage input terminals; simply connecting the initial voltage input to the first capacitor reduces the complexity of the pixel driving circuit and lowers manufacturing costs.

[0077] Optionally, the third transistor is an oxide thin-film transistor. Since the third transistor functions as a switch and does not need to carry a large current, an oxide thin-film transistor can be used to reduce leakage current, improve the reliability of the pixel driving circuit, and thus improve the display effect of the LED display device when the pixel driving circuit is applied.

[0078] In addition to the driving transistor, all other transistors in the drive control circuit are used as switches, so oxide thin film transistors can be used to reduce leakage current, while low-temperature polycrystalline silicon thin film transistors with high mobility can be used to transmit larger drive currents.

[0079] It should be understood that, such as Figure 5 As shown, when the data signal DATA is stored at the output terminal B of the data scanning module, the larger the capacitance value of the first capacitor C1, the slower the attenuation of the data signal DATA. Therefore, a first capacitor C1 with a larger capacitance can be used to improve the reliability of the data signal DATA output by the data scanning module 600.

[0080] Specifically, simulations of the pixel driving circuit with different first capacitors yielded the following results: Table 1 below:

[0081] Table 1

[0082]

[0083] In Table 1, Vd represents the drain voltage of the driving transistor. In the DATA column, "Initial" represents the initial value of the data signal DATA stored at the output terminal B of the data scanning module, "Output" represents the value of the data signal DATA output by the data scanning module to the compensation module, and Vgd is Vg - Vs. As can be seen from Table 1, when the capacitance of the first capacitor C1 is 0.5pF, the data signal DATA attenuates by approximately 7%, and when the capacitance of the first capacitor C1 is 2pF, the data signal DATA attenuates by approximately 1%. A larger first capacitor C1 results in less attenuation of the data signal DATA, while a smaller first capacitor C1 results in greater attenuation of the data signal DATA. Therefore, the capacitance value of the first capacitor C1 can be selected according to the requirements of the data signal DATA, and no specific limitation is made here.

[0084] Based on the same inventive concept, embodiments of the present invention also provide a driving method for the pixel driving circuit as described above, such as... Figure 7 As shown, it includes:

[0085] S701, The storage coupling module responds to the voltage difference between the power supply voltage input at the power supply voltage input terminal and the first preset voltage input at the first preset voltage input terminal, and outputs a coupling signal to the compensation module.

[0086] S702, the compensation module responds to the data signal input at the input terminal that receives the coupling signal and the data signal, and outputs a drive signal to the drive control module;

[0087] S703, the drive control module responds to the received drive signal and drives the light-emitting module according to the first preset voltage and data signal.

[0088] Thus, under the action of the storage coupling module, when the drive control module drives the light-emitting module, the brightness of the light-emitting module is related to the first preset voltage and data signal, but not to the power supply voltage. This avoids the influence of voltage drop on the power supply line on the brightness of the light-emitting module, thereby improving the driving effect of the pixel driving circuit. When the pixel driving circuit is applied to LED display devices, it improves the display effect of the LED display device.

[0089] Based on the same inventive concept, this invention also provides a display panel. The implementation principle of the display panel is similar to that of the aforementioned pixel driving circuit. The specific implementation method of the display panel can be found in the aforementioned embodiment of the pixel driving circuit, and the repeated parts will not be described again.

[0090] Specifically, an embodiment of the present invention provides a display panel, such as... Figure 8 As shown, it includes the pixel driving circuit 801 as described above.

[0091] Optionally, such as Figure 9 As shown, the display panel also includes: a gate signal generation module 802 and an inverting module 803; the gate signal generation module 802 is connected to the pixel driving circuit 801 and the inverting module 803 respectively, and the gate signal generation module 802 is used to: output a first gate signal G1 to the pixel driving circuit 801 and the inverting module 803 respectively; the inverting module 803 is connected to the pixel driving circuit 801, and the inverting module 803 is used to: in response to receiving the first gate signal G1, output a second gate signal G2 to the pixel driving circuit 802.

[0092] Thus, by setting up an inverting module, the output of the first gate signal and the second gate signal can be achieved through a gate signal generation module, which simplifies the complexity of the display panel and reduces production costs.

[0093] It should be understood that the inverting module can be implemented using an inverter or other structure with inverting function, and the gate signal generation module can be implemented using a GOA circuit or other circuit that generates gate signals.

[0094] Based on the same inventive concept, this invention also provides a display device. The implementation principle of the display device is similar to that of the aforementioned pixel driving circuit. The specific implementation of the display device can be found in the aforementioned embodiment of the pixel driving device, and repeated details will not be described again.

[0095] Specifically, an embodiment of the present invention provides a display device, such as... Figure 10 As shown, it includes the display panel 1001 as described above.

[0096] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A pixel driving circuit, characterized in that, The application relates to a pixel driving circuit. The pixel driving circuit comprises a storage coupling module, a compensation module, a drive control module and a light-emitting module. The storage coupling module is connected with the compensation module, and the storage coupling module is used for outputting a coupling signal to the compensation module in response to a voltage difference between a power voltage inputted by an input end of the power voltage and a first preset voltage inputted by an input end of the first preset voltage. The compensation module is connected with the drive control module, and the compensation module is used for outputting a drive signal to the drive control module in response to a data signal inputted by an input end receiving the coupling signal and the data signal. The drive control module is connected with the light-emitting module and the input end of the power voltage respectively, and the drive control module is used for driving the light-emitting module according to the first preset voltage and the data signal in response to receiving the drive signal.

2. The pixel driving circuit according to claim 1, wherein The storage coupling module comprises a first transistor and a second transistor. An input end of the first transistor is connected with the input end of the first preset voltage, and an output end of the first transistor is connected with an output end of the storage coupling module. An input end of the second transistor is connected with the input end of the power voltage, and an output end of the second transistor is connected with the output end of the storage coupling module.

3. The pixel driving circuit of claim 2, wherein, A control end of the first transistor is connected with an input end of a first gate signal, a control end of the second transistor is connected with an input end of a second gate signal, and the first gate signal is opposite to the second gate signal.

4. The pixel driving circuit according to claim 2 or 3, wherein At least one of the first transistor and the second transistor is an oxide thin film transistor.

5. The pixel driving circuit of claim 1, wherein, The pixel driving circuit further comprises a data scanning module arranged between the compensation module and the input end of the data signal. The data scanning module is used for storing the data signal and outputting the data signal to the compensation module in a compensation stage in response to receiving the data signal.

6. The pixel driving circuit of claim 5, wherein, The data scanning module comprises a third transistor and a first capacitor. An input end of the third transistor is connected with the input end of the data signal, an output end of the third transistor is connected with an output end of the data scanning module, and a control end of the third transistor is connected with an input end of a data scanning signal. Two ends of the first capacitor are respectively connected with an input end of a second preset voltage and the output end of the data scanning module.

7. The pixel driving circuit of claim 6, wherein, The second preset voltage is an initial voltage.

8. The pixel driving circuit according to claim 6 or 7, wherein The third transistor is an oxide thin film transistor.

9. The pixel driving circuit of claim 1, wherein, The compensation module comprises a compensation capacitor, a fourth transistor and a fifth transistor. Two ends of the compensation capacitor are respectively connected with the storage coupling module and an output end of the fourth transistor. An input end of the fourth transistor is connected with the drive control module, an output end of the fourth transistor is connected with the drive control module, and a control end of the fourth transistor is connected with an input end of a third gate signal. An input end of the fifth transistor is connected with the input end of the data signal, an output end of the fifth transistor is connected with the drive control module, and a control end of the fifth transistor is connected with the input end of the third gate signal.

10. The pixel driving circuit of claim 1, wherein, The drive control module comprises a sixth transistor, a seventh transistor and a drive transistor; an input end of the sixth transistor is connected with an input end of the power voltage, an output end of the sixth transistor is connected with an input end of the drive transistor, and a control end of the sixth transistor is connected with an input end of the second gate signal; an input end of the seventh transistor is connected with an output end of the drive transistor, an output end of the seventh transistor is connected with the light-emitting module, and a control end of the seventh transistor is connected with the input end of the second gate signal; an input end of the drive transistor, an output end of the drive transistor and a control end of the drive transistor are connected with the compensation module respectively.

11. A driving method of the pixel driving circuit according to any one of claims 1 to 10, characterized by, comprises: The storage coupling module outputs a coupling signal to the compensation module in response to a voltage difference between a power voltage input by an input end of the power voltage and a first preset voltage input by an input end of the first preset voltage; The compensation module outputs a drive signal to the drive control module in response to a data signal input by an input end receiving the coupling signal and the data signal; The drive control module drives the light-emitting module according to the first preset voltage and the data signal in response to receiving the drive signal.

12. A display panel, characterized by The display panel comprises the pixel drive circuit according to any one of claims 1-10.

13. The display panel of claim 12, wherein, The display panel further comprises a gate signal generation module and an inverting module; The gate signal generation module is connected with the pixel drive circuit and the inverting module respectively, and is configured to output a first gate signal to the pixel drive circuit and the inverting module respectively; The inverting module is connected with the pixel drive circuit, and is configured to output a second gate signal to the pixel drive circuit in response to receiving the first gate signal.

14. A display device comprising: The display panel comprises the display panel according to claim 12 or 13.

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