Pixel driving circuit and display panel

Abstract

The application discloses a pixel driving circuit and a display panel, and belongs to the technical field of display. The pixel driving circuit comprises a light-emitting module, a first switch module, a second switch module and a driving module. Due to the difference in parasitic capacitance in different sub-pixel driving circuits in the display panel, the display brightness in different sub-pixel driving circuits may be different. The application combines the above modules, when the first switch module pulls down the storage voltage of the driving module due to the feedthrough effect, the second switch module provides a pull-down compensation voltage under the driving of the reverse gate driving voltage, thereby effectively inhibiting the feedthrough effect in the pixel driving circuit and improving the uniformity of the display panel.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to pixel driving circuits and display panels. Background Technology

[0002] In existing technologies, the parasitic capacitance in different sub-pixel driving circuits on a display panel varies, leading to potential differences in display brightness and consequently poor brightness uniformity of the display panel. For example, at lower grayscale levels, the input signal voltage is also lower. Due to the feedthrough effect, the parasitic capacitance in the sub-pixel driving circuit pulls down the input signal voltage, causing changes in the display brightness of the sub-pixel driving circuit and resulting in poor uniformity of the display panel. Summary of the Invention

[0003] The main objective of this invention is to provide a pixel driving circuit and a display panel, aiming to solve the technical problem of how to suppress the feedthrough effect in the sub-pixel driving circuit and improve the uniformity of the display panel.

[0004] To achieve the above objectives, the present invention provides a pixel driving circuit, the pixel driving circuit comprising:

[0005] Light-emitting module;

[0006] A first switching module is connected to a positive gate drive voltage and a drain voltage. The first switching module is used to provide the drain voltage under the drive of the positive gate drive voltage.

[0007] The second switching module is connected to the first switching module. The second switching module is connected to the reverse gate drive voltage and is used to provide a pull-down cancellation voltage under the drive of the reverse gate drive voltage.

[0008] A driving module is connected to the second switching module. The driving module receives a driving current and is used to charge the light-emitting module based on the drain voltage to obtain a storage voltage. Under the control of the storage voltage and the pull-down cancellation voltage, the driving module provides the driving current to the light-emitting module.

[0009] Optionally, the light-emitting module includes:

[0010] The light-emitting device has its anode connected to the driving module and its cathode electrically connected to a common ground terminal.

[0011] Optionally, the first switch module includes:

[0012] A first thin-film transistor, wherein the gate of the first thin-film transistor is connected to the positive gate drive voltage, the drain of the first thin-film transistor is connected to the drain voltage, and the source of the first thin-film transistor is connected to the second switching module and the driving module.

[0013] Optionally, the second switch module includes:

[0014] The second thin-film transistor has its gate connected to the reverse gate drive voltage. The drain of the first thin-film transistor is connected to the source of the first thin-film transistor and the drive module. The source of the second thin-film transistor is connected to the drive module.

[0015] Optionally, the driving module includes:

[0016] The third thin-film transistor has its gate connected to the source and drain of the second thin-film transistor, its source connected to the driving power supply, and its drain connected to the anode of the light-emitting device.

[0017] A storage capacitor, the first end of which is connected to the source of the third thin-film transistor, and the gate of the third thin-film transistor is connected to the source of the second thin-film transistor and then connected to the second end of the storage capacitor.

[0018] Optionally, the first thin-film transistor, the second thin-film transistor, and the third thin-film transistor are P-type thin-film transistors.

[0019] Optionally, when the forward gate drive voltage is high, the first thin-film transistor is turned on and the second thin-film transistor is turned off, and the drain voltage charges the storage capacitor in the drive module to obtain the storage voltage.

[0020] Optionally, when the forward gate drive voltage is low, the first thin-film transistor is turned off, and the first thin-film transistor generates a pull-down voltage.

[0021] Optionally, when the forward gate drive voltage is low, the reverse gate drive voltage is high, the second thin-film transistor is turned on, and the second thin-film transistor provides a pull-down cancellation voltage under the drive of the forward gate drive voltage.

[0022] In addition, to achieve the above objectives, the present invention also provides a display panel, the display panel including the pixel driving circuit described above.

[0023] This invention proposes a pixel driving circuit and a display panel. The pixel driving circuit is optimized to provide an optimized version comprising a light-emitting module, a first switching module, a second switching module, and a driving module. Since the parasitic capacitances in different sub-pixel driving circuits within the display panel differ, differences in display brightness may exist. This invention, by combining the aforementioned modules, compensates for the feedthrough effect by having the second switching module provide a pull-down cancellation voltage under the reverse gate driving voltage when the first switching module pulls down the stored voltage of the driving module. This effectively suppresses the feedthrough effect in the pixel driving circuit and improves the uniformity of the display panel. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a functional module diagram of an embodiment of the pixel driving circuit of the present invention;

[0026] Figure 2 This is a schematic diagram of the circuit structure of an embodiment of the pixel driving circuit of the present invention;

[0027] Figure 3 This is a schematic diagram of the equivalent circuit structure of an embodiment of the pixel driving circuit of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the display panel involved in the embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the waveforms of the forward gate drive voltage and the reverse gate drive voltage in an embodiment of the present invention;

[0030] Figure 6 This is an equivalent schematic diagram of a pixel driving circuit.

[0031] Figure 7 This is a schematic diagram of the contact level waveform of the switching transistor in the pixel driving circuit.

[0032] Explanation of icon numbers:

[0033]

[0034]

[0035] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0037] This invention provides a pixel driving circuit, referring to... Figure 1 , Figure 1 This is a functional module diagram of an embodiment of a pixel driving circuit according to the present invention.

[0038] In this embodiment, the pixel driving circuit includes:

[0039] Light-emitting module 10;

[0040] A first switching module 20 is connected to a positive gate drive voltage Vgdte and a drain voltage Vdata. The first switching module 20 is used to provide the drain voltage Vdata under the drive of the positive gate drive voltage Vgdte.

[0041] The second switch module 30 is connected to the first switch module 20. The second switch module 30 is connected to the reverse gate drive voltage Vgdte-p. The second switch module 30 is used to provide a pull-down cancellation voltage under the drive of the reverse gate drive voltage Vgdte-p.

[0042] The driving module 40 is connected to the second switch module 30 and is connected to the driving power supply VCC. The driving module 40 is used to charge based on the drain voltage Vdata to obtain a storage voltage, and to provide driving current to the light-emitting module 10 based on the driving power supply VCC under the control of the storage voltage and the pull-down cancellation voltage.

[0043] It should be noted that existing pixel driving circuits suffer from variations in the manufacturing process capabilities of the switching transistors in each sub-pixel driving circuit on the display panel (specifically, differences in the parasitic capacitance and equivalent resistance of the switching transistors, especially noticeable in sub-pixel driving circuits located far apart on the display panel). Consequently, when the switching transistors are off, the parasitic capacitance can lower the storage voltage of the storage capacitor due to the feedthrough effect, leading to changes in the current flowing through the light-emitting module and resulting in poor brightness uniformity across the entire display panel. (Refer to...) Figure 6 , Figure 6The diagram shows an equivalent schematic of the pixel driving circuit. When the first thin-film transistor T1 is off, the parasitic capacitance C2 in the first thin-film transistor T1 pulls down the voltage in the storage capacitor C1, creating a feedthrough effect. (Refer to...) Figure 7 , Figure 7 This is a schematic diagram of the contact level waveform of the switching transistor in the pixel driving circuit. Figure 1 `line` represents the high-level time of Vg, `1frame` represents one level cycle of Vg, Vg is the voltage connected to the gate of the first thin-film transistor T1, Vd represents the voltage connected to the drain 2 of the first thin-film transistor T1, Vs represents the output voltage of the source of the first thin-film transistor T1, ΔV represents the storage voltage of the storage capacitor pulled down by the feedthrough effect when the first thin-film transistor T1 is turned off, Vgl represents a low level, and Vgh represents a high level. The actual storage voltage ΔV pulled down by the feedthrough effect can be calculated by the following formula (1).

[0044]

[0045] Wherein, c1 and c2 refer to the capacitance values ​​corresponding to capacitors C1 and C2. Common optimization schemes based on the feedthrough effect involve reducing the parasitic capacitance of the switching transistor, increasing the storage capacitance, or modifying the driving voltage waveform of the switching transistor. However, reducing the parasitic capacitance of the switching transistor is no longer feasible due to the transistor's structural limitations. Increasing the storage capacitance requires expanding the capacitor design space, which contradicts the trend towards smaller display panels. Furthermore, modifying the driving voltage waveform of the switching transistor can lead to insufficient signal charging time for high refresh rate display panels, preventing the target voltage from being reached and thus failing to meet the user's high refresh rate requirements. Therefore, based on the shortcomings of these technologies, the technical solution proposed in this application is presented.

[0046] In this embodiment, to avoid the phenomenon where the first switching module 20, after charging the driving module 40 with the drain voltage Vdata controlled by the forward gate driving voltage Vgdte to obtain the storage voltage, turns off and the storage voltage is pulled down due to the feedthrough effect, a second switching module 30 is added. This second switching module provides a pull-down cancellation voltage driven by the reverse gate driving voltage Vgdte-p, thereby compensating for the first switching module 20's pull-down of the storage voltage due to the feedthrough effect. This ensures the accuracy of the stored voltage, enabling accurate control of the driving module 40, and thus guaranteeing the brightness uniformity in the sub-pixel driving circuits on the display panel, ultimately ensuring the display effect of the display panel. Since the forward gate driving voltage Vgdte and the reverse gate driving voltage Vgdte-p are distinguished by their forward and reverse directions, they can be referred to... Figure 5 , Figure 5 This is a waveform diagram of the forward gate drive voltage and the reverse gate drive voltage in an embodiment of the present invention. The two reverse gate drive voltages can cause the switching transistors in the first switching module 20 and the second switching module 30 to work at different times. This allows the stored voltage to be lowered due to the feedthrough effect when the switching transistor in the first switching module 20 is turned off, while the switching transistor in the second switching module 30 is turned on. This provides a pull-down cancellation voltage under the drive of the reverse gate drive voltage Vgdte-p to compensate for the lower stored voltage due to the feedthrough effect when the switching transistor in the first switching module 20 is turned off. This suppresses the feedthrough effect in the pixel driving circuit and improves the brightness uniformity of the display panel.

[0047] Furthermore, referring to Figure 2 , Figure 2 This is a schematic diagram of the circuit structure of an embodiment of a pixel driving circuit according to the present invention.

[0048] like Figure 2 As shown, in some feasible embodiments, the light-emitting module 10 includes:

[0049] The light-emitting device D1 has its anode P connected to the driving module and its cathode N electrically connected to the common ground GND. The light-emitting device D1 can be a miniature light-emitting diode.

[0050] Furthermore, in some feasible embodiments, the first switch module 20 includes:

[0051] A first thin-film transistor T1 has its gate G connected to the positive gate drive voltage Vgdte, its drain D connected to the drain voltage Vdata, and its source S connected to the second switching module 30 and the driving module 40.

[0052] Furthermore, in some feasible embodiments, the second switch module 30 includes:

[0053] The second thin-film transistor T2 has its gate connected to the reverse gate drive voltage Vgdte-p. The drain of the first thin-film transistor T2 is connected to the source of the first thin-film transistor T1 and the drive module 40. The source of the second thin-film transistor T2 is connected to the drive module 40.

[0054] Furthermore, in some feasible embodiments, the driving module 40 includes:

[0055] The third thin-film transistor T3 has its gate connected to the source and drain of the second thin-film transistor T2, its source connected to the driving power supply VCC, and its drain connected to the anode P terminal of the light-emitting device D1.

[0056] Storage capacitor C1, the first end of which is connected to the source of the third thin film transistor T3, and the second end of which is connected after the gate of the third thin film transistor T3 is connected to the source of the second thin film transistor T2.

[0057] Furthermore, in some feasible embodiments, the first thin-film transistor T1, the second thin-film transistor T2, and the third thin-film transistor T3 are P-type thin-film transistors.

[0058] It is understandable that the first thin-film transistor T1 is driven by the forward gate drive voltage Vgdte. When the forward gate drive voltage Vgdte is high, the drain voltage Vdata is used to charge the storage capacitor C1 in the drive module 40 to obtain the storage voltage. The storage voltage refers to the voltage value of the storage capacitor C1 obtained by charging the storage capacitor C1 with the drain voltage Vdata. When the forward gate drive voltage Vgdte is low, the parasitic capacitance in the first thin-film transistor T1 will pull down the storage voltage of the storage capacitor C1 due to the feedthrough effect. The second thin-film transistor T2 is driven by the reverse gate drive voltage Vgdte-p. The reverse gate drive voltage Vgdte-p is characterized by its constant inversion with the forward gate drive voltage Vgdte. It only needs to be reversed before being applied to the gate of the second thin-film transistor T2. When the parasitic capacitance in the first thin-film transistor T1 pulls down the storage voltage of the storage capacitor C1 due to the feedthrough effect, the reverse gate drive voltage Vgdte-p becomes high, turning on the second thin-film transistor T2. Because the second thin-film transistor T2 also has parasitic capacitance, it will also pull up the storage voltage of the storage capacitor C1. Since the second thin-film transistor T2 and the first thin-film transistor T1 are in the same pixel driving circuit, their process capabilities are the same, meaning their parasitic capacitances are identical, thus enabling the implementation of… Figure 2The storage voltage of the storage capacitor C1 remains balanced at point P. That is, the voltage value lowered by the feedthrough effect of the first thin-film transistor T1 is equal to the voltage value higher by the conduction of the second thin-film transistor T2. This ensures that the storage voltage of the storage capacitor C1 will not change due to the feedthrough effect, thereby effectively suppressing the feedthrough effect in the pixel driving circuit and improving the brightness uniformity of the display panel.

[0059] It should be noted that the transistors used in all embodiments of this invention can be TFTs (Thin Film Transistors), field-effect transistors, or other devices with similar characteristics. Since the source and drain of the transistors used here are symmetrical, their sources and drains are interchangeable. In these embodiments, to distinguish the two terminals of the transistor other than the gate, one terminal is referred to as the source, and the other as the drain. Figure 2 In the diagram, the characteristics of each port of the first thin-film transistor T1 can be determined according to the G, D, and S markings, where G is the gate of T1, S is the source of T1, and D is the drain of T1. The characteristics of the other transistors can be determined according to... Figure 2 The configuration is defined as follows: the middle terminal of each transistor is the gate, the signal input terminal is the source, and the signal output terminal is the drain.

[0060] Furthermore, the transistors used in the embodiments of the present invention may include both P-type transistors and / or N-type transistors. Specifically, the P-type transistor is turned on when the gate is at a low level and turned off when the gate is at a high level, while the N-type transistor is turned on when the gate is at a high level and turned off when the gate is at a low level.

[0061] Furthermore, in some feasible embodiments, the first thin-film transistor T1, the second thin-film transistor T2, and the third thin-film transistor T3 can be low-temperature polycrystalline silicon thin-film transistors, oxide semiconductor thin-film transistors, or amorphous silicon thin-film transistors. The transistors in the driving circuit provided by the embodiments of the present invention are all made of the same material, thereby avoiding the influence of differences between transistors of different materials on the driving circuit.

[0062] Furthermore, in some feasible embodiments, when the forward gate drive voltage Vgdte is high, the reverse gate drive voltage Vgdte-p is low, the first thin-film transistor T1 is turned on, the second thin-film transistor T2 is turned off, and the drain voltage Vdata charges the storage capacitor C1 in the drive module 40 to obtain the storage voltage.

[0063] Furthermore, in some feasible embodiments, when the forward gate drive voltage Vgdte is low, the first thin-film transistor T1 is turned off, and the first thin-film transistor T1 generates a pull-down voltage.

[0064] Furthermore, in some feasible embodiments, when the forward gate drive voltage Vgdte is low, the reverse gate drive voltage Vgdte-p is high, the second thin-film transistor T2 is turned on, and the second thin-film transistor T2 provides a pull-down cancellation voltage under the drive of the forward gate drive voltage Vgdte-p.

[0065] It should be noted that in this embodiment, the first stage is when the forward gate drive voltage Vgdte is high and the reverse gate drive voltage Vgdte-p is low. The first thin film transistor T1 is turned on due to the high gate level, and the second thin film transistor T2 is turned off due to the low gate level. At this time, the drain voltage Vdata turns on the third thin film transistor T3 through the first thin film transistor T1, and the light-emitting device D1 lights up and emits light. At the same time, the storage capacitor C1 is charged to obtain the storage voltage.

[0066] In the next stage, when the forward gate drive voltage Vgdte is low and the reverse gate drive voltage Vgdte-p is high, the first thin-film transistor T1 is turned off due to the low gate level, and the second thin-film transistor T2 is turned on due to the high gate level. Because of the feedthrough effect when the first thin-film transistor T1 is off, the voltage at point P is pulled down. However, when the second thin-film transistor T2 is on, the internal parasitic capacitance creates a voltage, which pulls the voltage at point P back up. Since the TFT characteristics of the same sub-pixel can be kept consistent in process capability, the two effects can cancel each other out, thus reducing or even eliminating the influence of the feedthrough effect. At this time, the charge of the storage capacitor C1 is less affected, thus ensuring accurate grayscale voltage. For example, the traditional storage capacitor C1 requires a 5V voltage to drive the third thin-film transistor T3. Its working principle is that the 5V voltage controls the opening size of the third thin-film transistor T3, which in turn controls the driving current that the driving power supply VCC needs to flow through the light-emitting device D1. Therefore, different driving currents control different brightness levels of the light-emitting device D1. The driving current refers to the current that drives the light-emitting device D1 to light up at different brightness levels. The storage capacitor C1 is charged to 5V via the drain voltage Vdata, thereby turning off the first thin-film transistor T1. This allows the third thin-film transistor T3 to operate using the 5V voltage. However, turning off the first thin-film transistor T1 causes the storage voltage of the storage capacitor C1 to drop below 5V due to the feedthrough effect. Assuming the first thin-film transistor T1 requires 2V, the actual storage voltage of the storage capacitor C1 is only 3V due to the feedthrough effect. Therefore, driving the third thin-film transistor T3 with a storage voltage of 3V results in uneven brightness. Furthermore, the parasitic capacitance of the first thin-film transistor T1 differs for different pixel driving circuits, leading to different voltage drops and consequently poor display uniformity across the entire display panel. In this embodiment, a second thin-film transistor T2 is connected to each pixel driving circuit to compensate for the storage voltage of the storage capacitor C1 pulled down by the feedthrough effect.For example, due to the feedthrough effect, the actual storage voltage of the storage capacitor C1 is only 3V. At this time, the second thin-film transistor T2 will be turned on (the second thin-film transistor T2 and the first thin-film transistor T1 can be turned on at different times because they are connected to different gate voltages). Due to the parasitic capacitance of the second thin-film transistor T2 and the fact that it is in the same pixel driving circuit as the first thin-film transistor T1, the storage voltage will be pulled up to a value of 2V, which is the same as or very close to the value pulled down by the first thin-film transistor T1 due to the feedthrough effect. In the end, the storage voltage of the storage capacitor C1 is still 5V or very close to 5V. Thus, the third thin-film transistor T3 can be driven to work with a voltage of 5V, which will not affect the light emission of the light-emitting device D1, ensuring the uniformity of light emission of the display panel and improving the user experience.

[0067] This embodiment proposes a pixel driving circuit and a display panel. The invention optimizes existing pixel driving circuits that suffer from feedthrough effect, resulting in a novel pixel driving circuit. This circuit includes a light-emitting module, a first switching module, a second switching module, and a driving module. Since the parasitic capacitances in different sub-pixel driving circuits within the display panel differ, differences in display brightness may exist. This invention, by combining the aforementioned modules, compensates for the feedthrough effect by having the second switching module provide a pull-down cancellation voltage under the reverse gate driving voltage when the first switching module pulls down the stored voltage of the driving module. This effectively suppresses the feedthrough effect in the pixel driving circuit and improves the uniformity of the display panel.

[0068] In addition, refer to Figure 3 , Figure 3 This is a schematic diagram of the equivalent circuit structure of an embodiment of the pixel driving circuit of the present invention.

[0069] It should be noted that, Figure 3 and Figure 2The only difference lies in the equivalent parasitic capacitance of the first thin-film transistor T1 and the second thin-film transistor T2. In this embodiment, the presence of parasitic capacitance C1 in T1 causes a feedthrough effect when the first thin-film transistor T1 is off, resulting in a lower storage voltage in storage capacitor C1 due to voltage division by parasitic capacitance C1. Conversely, the presence of parasitic capacitance C2 in T2 causes the second thin-film transistor T2 to turn on when the storage voltage is lowered due to voltage division by parasitic capacitance C1. The presence of voltage in parasitic capacitance C2 in T2 then raises the storage voltage. However, because the first thin-film transistor T1... Since the second thin-film transistor T2 exists in a pixel driving circuit, their parasitic capacitances are not significantly different or are the same. This ensures that the pull-down and pull-up storage voltages are the same, thereby suppressing the feedthrough effect when the first thin-film transistor T1 is turned off and ensuring the accuracy of the storage voltage. The conduction of the third thin-film transistor T3 can be controlled based on the accurate storage voltage, realizing the control of the current flowing through the light-emitting device D1 based on the controlled third thin-film transistor T3. This ensures the accuracy of the illumination of all light-emitting devices D1 on the display panel, thereby improving the uniformity of the display panel.

[0070] This embodiment provides a pixel driving circuit that provides a function to suppress the feedthrough effect for the first switching module. When the first switching module pulls down the stored voltage of the driving module due to the feedthrough effect, the second switching module provides a pull-down cancellation voltage under the drive of the reverse gate driving voltage to compensate for the feedthrough effect. This effectively suppresses the feedthrough effect in the pixel driving circuit, improves the uniformity of the display panel, and avoids the technical defect of poor brightness uniformity in traditional pixel driving circuits.

[0071] Furthermore, embodiments of the present invention also propose a display panel, the display panel including the pixel driving circuit described above, with reference to... Figure 4 , Figure 4 This is a schematic diagram of the structure of the display panel involved in the embodiment of the present invention.

[0072] like Figure 4As shown, the display panel may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk drive. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0073] Those skilled in the art will understand that Figure 4 The structure shown does not constitute a limitation on the display panel and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0074] like Figure 4 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a data storage module, a network communication module, a user interface module, and computer programs.

[0075] exist Figure 4 In the display panel shown, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in this embodiment can be set in the display panel, and the display panel calls the computer program stored in the memory 1005 through the processor 1001 and controls the above-mentioned pixel driving circuit.

[0076] All embodiments of the display panel of the present invention can refer to the various embodiments of the pixel driving circuit of the present invention, which will not be described again here.

[0077] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0078] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0079] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0080] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A pixel driving circuit, characterized in that, The pixel driving circuit includes: Light-emitting module; A first switching module is connected to a positive gate drive voltage and a drain voltage. The first switching module is used to provide the drain voltage under the drive of the positive gate drive voltage. The second switching module is connected to the first switching module. The second switching module is connected to the reverse gate drive voltage and is used to provide a pull-down cancellation voltage under the drive of the reverse gate drive voltage. A driving module is connected to the second switching module and connected to a driving power supply. The driving module is used to charge the light-emitting module based on the drain voltage to obtain a storage voltage, and to provide a driving current to the light-emitting module under the control of the storage voltage and the pull-down cancellation voltage. The first switching module includes a first thin-film transistor, the gate of the first thin-film transistor is connected to the positive gate driving voltage, the drain of the first thin-film transistor is connected to the drain voltage, and the source of the first thin-film transistor is connected to the second switching module and the driving module. The second switching module includes: a second thin-film transistor, the gate of the second thin-film transistor being connected to the reverse gate drive voltage, the drain of the first thin-film transistor being connected to the source of the first thin-film transistor and the drive module, the source of the second thin-film transistor being connected to the drive module, and the reverse gate drive voltage being the opposite drive voltage to the positive gate drive voltage.

2. The pixel driving circuit as described in claim 1, characterized in that, The light-emitting module includes: The light-emitting device has its anode connected to the driving module and its cathode electrically connected to a common ground terminal.

3. The pixel driving circuit as described in claim 2, characterized in that, The driving module includes: The third thin-film transistor has its gate connected to the source and drain of the second thin-film transistor, its source connected to the driving power supply, and its drain connected to the anode of the light-emitting device. A storage capacitor, the first end of which is connected to the source of the third thin-film transistor, and the gate of the third thin-film transistor is connected to the source of the second thin-film transistor and then connected to the second end of the storage capacitor.

4. The pixel driving circuit as described in claim 3, characterized in that, The first thin-film transistor, the second thin-film transistor, and the third thin-film transistor are P-type thin-film transistors.

5. The pixel driving circuit as described in claim 4, characterized in that, When the forward gate drive voltage is high, the reverse gate drive voltage is low, the first thin-film transistor is turned on, the second thin-film transistor is turned off, and the drain voltage charges the storage capacitor in the drive module to obtain the storage voltage.

6. The pixel driving circuit as described in claim 5, characterized in that, When the forward gate drive voltage is low, the first thin-film transistor is turned off, and the first thin-film transistor generates a pull-down voltage.

7. The pixel driving circuit as described in claim 6, characterized in that, When the forward gate drive voltage is low, the reverse gate drive voltage is high, the second thin-film transistor is turned on, and the second thin-film transistor provides a pull-down cancellation voltage under the drive of the forward gate drive voltage.

8. A display panel, characterized in that, The display panel includes a pixel driving circuit as described in any one of claims 1 to 7.

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