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

Abstract

The invention provides a pixel driving method, a driving circuit, a display panel and a display device. The pixel driving method comprises the following steps: providing the display panel; the display panel comprises a plurality of sub-pixels; determining an initial light emitting stage of each frame period of the sub-pixels; obtaining a display brightness value of the display panel; the pulse width of the first scanning signal under the condition that the display brightness value is larger than or equal to a first preset threshold value in the initial light emitting stage is obtained and serves as the first pulse width; in response to the condition that the display brightness value in the initial light emitting stage is smaller than a first preset threshold value, reducing the pulse width of the first scanning signal to enable the pulse width to be equal to the first pulse width; according to the invention, the lighting time of the light-emitting element at the earlier stage of each frame period under the condition of low brightness is reduced, so that the lighting time under different brightness in one frame period is the same, and the problem of low-frequency flicker of an OLED product is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display panels, and more particularly, to a pixel driving method, a driving circuit, a display panel, and a display device. Background Art

[0002] Organic Light Emitting Diode (OLED) has the characteristics of self-luminescence, fast response, wide color gamut, large viewing angle, high brightness, etc., and can be used to manufacture thin display devices and flexible display devices, becoming the focus of research in the current display technology field.

[0003] Organic light emitting diodes require current drive, that is, OLEDs are current-controlled devices, and their brightness is proportional to the average time of current passing. When the current is less than the emission threshold of the OLED, the emission brightness of the device is very small. When the current reaches its emission threshold, the emission intensity of the OLED increases with the increase of the current. An OLED unit can be simplified into an LED and a parasitic capacitor connected in parallel. To make the OLED emit light, the current source first needs to charge the parasitic capacitor to the emission voltage of the OLED, so the charging time will be relatively long and the response time will be relatively slow.

[0004] For OLED products with fixed-frequency display, there will be no brightness flicker problem during the switching between frames. For OLED products with variable-frequency display, at low gray levels, the emission current of the OLED is small, and the parasitic capacitor of the OLED cannot be charged quickly. For a long time within each frame, the OLED light-emitting element cannot reach the maximum brightness. In the case of low refresh rate display, within each frame period, the turn-on time differences under different DBV (display brightness value) conditions are relatively large, and brightness flicker problems may occur.

[0005] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present invention, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0006] In view of this, the present invention provides a pixel driving method, a driving circuit, a display panel, and a display device to solve the flicker problem caused by the relatively large differences in turn-on times of different DBVs within one frame period.

[0007] According to one aspect of the present invention, there is provided a pixel driving method applied to a pixel driving circuit. The pixel driving circuit includes a light-emitting element, a first switching device for transmitting a driving current to the light-emitting element, and a reset transistor connected to the anode of the light-emitting element; the first switching device is connected to a first scan signal; the method includes the steps of:

[0008] Provide a display panel; the display panel includes a plurality of sub-pixels;

[0009] Determine the initial light-emitting stage of each frame period of the sub-pixels;

[0010] Obtain the display brightness value of the display panel;

[0011] When the display brightness value in the initial light-emitting stage is greater than or equal to a first preset threshold, obtain the pulse width of the first scan signal as the first pulse width;

[0012] In response to the display brightness value in the initial light-emitting stage being less than the first preset threshold, reduce the pulse width of the first scan signal to be equal to the first pulse width.

[0013] Optionally, the method further includes the steps of:

[0014] Determine the effective light-emitting stage of each frame period of the sub-pixels;

[0015] In response to the display brightness value in the effective light-emitting stage being less than the first preset threshold, adjust the pulse width of the first scan signal to be greater than the first pulse width.

[0016] Optionally, the reset transistor is connected to an initial reset signal; the method further includes the steps of:

[0017] During the initial light-emitting stage, increase the pulse width of the initial reset signal.

[0018] Optionally, the reset transistor is connected to an initial reset signal, and the method further includes the steps of:

[0019] During the initial light-emitting stage, reduce the number of times the reset transistor is turned on.

[0020] Optionally, during the initial light-emitting stage, the pulse waveform of the first scan signal when the display brightness value is less than the first preset threshold is the same as its pulse waveform when the display brightness value is greater than or equal to the first preset threshold.

[0021] Optionally, the step of increasing the pulse width of the initial reset signal during the initial light-emitting stage includes:

[0022] Obtain the pulse waveform of the initial reset signal before adjustment as a reference pulse waveform;

[0023] Based on the reference pulse waveform, increase the pulse width of the initial reset signal during the initial light-emitting stage.

[0024] Optionally, the method further includes the steps of:

[0025] Determining an effective light-emitting stage of each frame period of the sub-pixel;

[0026] Setting a pulse waveform of the initial reset signal in the effective light-emitting stage to be the same as a pulse waveform of the reference pulse waveform in the effective light-emitting stage.

[0027] Optionally, the reset transistor is further connected to a first reference voltage signal, and the pixel driving circuit further includes a driving transistor, and the driving transistor is respectively connected to a second reference voltage signal and the first switching device.

[0028] According to another aspect of the present invention, there is provided a pixel driving circuit, which includes a light-emitting element, a first switching device for transmitting a driving current to the light-emitting element, and a reset transistor connected to an anode of the light-emitting element; the first switching device is connected to a first scanning signal; the pixel driving circuit is driven based on any one of the above pixel driving methods.

[0029] According to another aspect of the present invention, there is provided a display panel, and the above display panel includes the above pixel driving circuit.

[0030] According to another aspect of the present invention, there is provided a display device, and the above display device includes the above display panel.

[0031] The beneficial effects of the present invention compared with the prior art are as follows:

[0032] The pixel driving method, driving circuit, display panel and display device provided by the present invention adjust the pulse width of the first scanning signal in the initial light-emitting stage under low brightness; and set different working timings for the first scanning signal according to different display brightnesses, so that the light-emitting element can quickly light up in the initial light-emitting stage under low brightness, reducing the initial lighting time in the early stage of each frame period under low brightness, making the lighting times under different display brightnesses the same, and improving the low-frequency flicker problem of OLED products. Description of the Drawings

[0033] The drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0034] Figure 1 It is a schematic structural diagram of a pixel driving circuit disclosed in an embodiment of the present invention;

[0035] Figure 2 A timing schematic diagram showing the delayed emission time in an embodiment of the present invention;

[0036] Figure 3 A flowchart schematic diagram of a pixel driving method disclosed in an embodiment of the present invention;

[0037] Figure 4 A timing schematic diagram showing the working timings of the first scan signal in low brightness before adjustment, the first scan signal in high brightness, and the initial reset signal;

[0038] Figure 5 A timing schematic diagram showing the working timings of the first scan signal in low brightness after adjustment based on the solution of the present invention, the first scan signal in high brightness, and the initial reset signal;

[0039] Figure 6 A comparison schematic diagram of the light - on times corresponding to the case of equivalent one - frame at 30Hz refresh rate to two - frames at 60Hz refresh rate before adjustment;

[0040] Figure 7 A brightness change schematic diagram of two adjacent frames at 30Hz refresh rate disclosed in an embodiment of the present invention;

[0041] Figure 8 A comparison schematic diagram of the light - on times corresponding to the case of equivalent one - frame at 30Hz refresh rate to two - frames at 60Hz refresh rate after adjustment based on the solution of the present invention. Detailed implementation manners

[0042] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present disclosure. However, those skilled in the art will realize that the technical solutions of the present disclosure can be practiced without one or more of the specific details, or other methods, materials, devices, etc. can be used. In other cases, well - known technical solutions are not shown or described in detail to avoid obscuring aspects of the present disclosure. The same reference numerals in the figures denote the same or similar structures, and thus their detailed descriptions will be omitted.

[0043] The terms "a", "an", "the", "above-mentioned", and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "comprising", "having", and "provided with" are used to mean an open inclusion and refer to the possibility of the existence of additional elements / components / etc. in addition to the listed elements / components / etc.

[0044] Figure 1 A pixel driving circuit in an embodiment of the present invention is shown. The driving circuit includes a light-emitting element D1, a first switching device T1, a driving transistor T2, and a reset transistor T3. The driving transistor T2 generates a driving current I OLED , and the third electrode, i.e., the gate, of the driving transistor T2 can be connected to a preset data signal DATA. When the preset data signal DATA writes a grayscale voltage to the gate of the driving transistor T2, the driving transistor T2 is turned on. The magnitude of the current conducted by the driving transistor T2 determines the driving current of the grayscale, thereby realizing the display of different brightness levels.

[0045] The first electrode of the driving transistor T2 is connected to a second reference voltage signal ELVDD, and the second electrode is connected to the first electrode of the first switching device T1. The second electrode of the first switching device T1 is connected to the anode of the light-emitting element D1, and the third electrode, i.e., the gate, of the first switching device T1 is connected to a first scan signal EM. The first electrode of the reset transistor T3 is connected to a first reference voltage signal VINT, the second electrode is connected to the anode of the light-emitting element D1, and the third electrode, i.e., the gate, is connected to an initial reset signal S n . The cathode of the light-emitting element D1 is connected to a third reference voltage signal ELVSS.

[0046] As can be seen from the above circuit structure, the initial reset signal S n controls the on and off states of the reset transistor T3. The first scan signal EM controls the on and off states of the first switching device T1. The signal EM is a periodic cut-off signal input to the gate of the first switching device T1. In this embodiment, the signal EM is a periodic high-level signal, which is used to generate a black screen at a certain frequency within each frame period. Specifically, referring to Figure 1 , when the gate of the first switching device T1 receives a high-level signal, the first switching device T1 is turned off, and the driving current I OLED cannot be transmitted to the OLED light-emitting element D1 through the first switching device T1, resulting in the brightness of the light-emitting element D1 being reduced to zero and generating a black screen.

[0047] Continuing to refer to Figure 1 , the initial reset signal S n is a level signal received by the gate of the reset transistor T3. There is a parasitic capacitance C OLED between the anode and the cathode of the light-emitting element D1.

[0048] Specifically referring to Figure 2 the principle shown, during the operation of the driving circuit, at the initial stage of a frame period, when an initial reset signal S is input to the gate of the reset transistor T3 n , at this time the EM signal is at a high level, the light-emitting element D1 does not work, and the reset transistor T3 discharges the parasitic capacitance C OLED of the light-emitting element D1 to prevent the contrast from decreasing. When the initial reset signal S n is set to a high level and the EM signal is set to a low level, the reset process ends, and the light-emitting element D1 enters the effective light-emitting stage. However, due to the existence of the parasitic capacitance C OLED , the driving current I OLED that should flow from the anode to the cathode of the light-emitting element D1 to make the light-emitting element D1 emit light during the light-emitting stage OLED first charges the parasitic capacitance C DELAY , and then flows through the light-emitting element D1, causing the OLED light-emitting element D1 to have a delayed light-emitting time t

[0049] Thus, at the initial stage of the frame period, due to the charging process of the parasitic capacitance C OLED , there is a certain time delay in the light emission of the light-emitting element D1, which is manifested as the anode voltage V Figure 2 of the OLED light-emitting element D1 slowly rising to a predetermined value at the initial stage of the frame period, and the luminance of the OLED light-emitting element D1 having a delayed light-emitting time t ANODE at the initial stage of the frame period. The time period corresponding to this delayed light-emitting time is the initial light-emitting stage, and the stage after the initial light-emitting stage when the OLED light-emitting element emits light normally is the effective light-emitting stage DELAY .

[0050] The delayed light-emitting time t DELAY is specifically determined according to the following formula (1):

[0051]

[0052] where V F is the forward voltage drop of the OLED light-emitting element D1, that is, the voltage value between the anode and cathode of the OLED light-emitting element D1 to ensure the normal light emission of the OLED light-emitting element D1

[0053] The delayed light-emitting time t DELAY has a gray-scale dependence. Under the display condition of high gray levels (when the driving current I OLED is high), the delayed light-emitting time t DELAY is a very small value and can be ignored

[0054] For exampleFigure 3 As shown, an embodiment of the present invention discloses a pixel driving method. This pixel driving method is applied to the pixel driving circuit disclosed in any of the above embodiments. Referring to Figure 3 As shown, the pixel driving method in this embodiment mainly includes: S110, providing a display panel. The above display panel includes a plurality of sub-pixels. S120, determining the initial light-emitting stage of each frame period of the above sub-pixels. S130, obtaining the display brightness value of the above display panel. S140, obtaining the pulse width of the above first scan signal when the display brightness value in the above initial light-emitting stage is greater than or equal to a first preset threshold, as the first pulse width. S150, in response to the display brightness value in the above initial light-emitting stage being less than the first preset threshold, reducing the pulse width of the above first scan signal to be equal to the above first pulse width. That is, the charging duration in the case where the display brightness value in the initial light-emitting stage is less than the first preset threshold is increased, achieving the effect of quickly turning on the light-emitting element.

[0055] Among them, in the above step S120, the initial light-emitting stage is the corresponding stage of the above delay light-emitting time t DELAY , that is, the stage when the OLED light-emitting element D1 is turned on. In the above step S130, the display brightness value is the DBV (display brightness value). The purpose of the above step S150 is to make the pulse width of the EM signal when the display brightness value in the initial light-emitting stage is less than the first preset threshold equal to the pulse width of the EM signal when the display brightness value is greater than or equal to the first preset threshold.

[0056] In some embodiments, the case where the above display brightness value is less than the first preset threshold can be understood as a low-brightness situation, and the case where the display brightness value is greater than or equal to the first preset threshold can be understood as a high-brightness situation.

[0057] That is, in this embodiment, referring to Figure 4 , EM1 is the waveform of the first scan signal when the adjusted display brightness value is less than the first preset threshold, that is, the waveform of the first scan signal in the low-brightness situation. EM2 is the waveform of the first scan signal when the adjusted display brightness value is greater than or equal to the first preset threshold, that is, the waveform of the first scan signal in the high-brightness situation. The time when the EM pulse signal is at a low level is the charging time of the light-emitting element. Referring to Figure 4It can be seen that the charging duration of the light-emitting element in the low-brightness case is significantly less than that in the high-brightness case, that is, the turn-on time in the low-brightness case is greater than that in the high-brightness case, and the turn-on times are different. Further, this makes it impossible to equivalently convert one frame at a 30 Hz refresh rate into two frames at a 60 Hz refresh rate, which is not conducive to the implementation of the technical solution corresponding to the idea of relying on equivalent refresh rate improvement to solve the flicker problem. Exemplarily, the above first preset threshold may be 50 nit, but the present invention is not limited thereto.

[0058] Reference Figure 5 , EM3 is the waveform of the first scan signal in the adjusted low-brightness case. EM4 is the waveform of the first scan signal in the adjusted high-brightness case. During the implementation of the technical solution of the embodiment of the present invention, the pulse waveforms of the first scan signal in the high-brightness case remain unchanged in the initial light-emitting stage and the effective light-emitting stage. In the low-brightness case, the pulse waveforms of the first scan signal change in both the initial light-emitting stage and the effective light-emitting stage.

[0059] Specifically, continuing to refer to Figure 4 and Figure 5 , in the low-brightness case, within one frame, because the charging time of the OLED is short, the brightness gradually increases from the initial light-emitting stage to the effective light-emitting stage. In the initial light-emitting stage, the pulse width of the first scan signal in the low-brightness case is reduced. In the effective light-emitting stage, the pulse width of the first scan signal in the low-brightness case is increased. That is, compared with the EM signal in the low-brightness case before adjustment, the pulse width of the EM signal becomes smaller. That is, the charging duration of the light-emitting element in the initial light-emitting stage in the low-brightness case is increased, achieving the effect of rapid turn-on of the light-emitting element. And the light-emitting brightness in the effective light-emitting stage is reduced, facilitating the subsequent equivalent conversion of one frame at a 30 Hz refresh rate into two frames at a 60 Hz refresh rate, and making the two equivalent 60 Hz brightnesses corresponding to 30 Hz as equal as possible, thereby facilitating further improvement of the flicker problem.

[0060] In some preferred embodiments, in the initial light-emitting stage, the pulse waveform of the first scan signal in the low-brightness case is the same as that in the high-brightness case. This is conducive to further ensuring that the turn-on times of the light-emitting elements are the same at different brightnesses, facilitating the subsequent equivalent conversion of one frame at a 30 Hz refresh rate into two frames at a 60 Hz refresh rate, and thus facilitating further improvement of the flicker problem.

[0061] Another embodiment of the present invention discloses another pixel driving method. This method is based on the above Figure 3Based on the corresponding embodiment, it further includes steps: S160, determining the effective light-emitting stage of each frame period of the above sub-pixels. S170, in response to the display brightness value in the above effective light-emitting stage being less than the first preset threshold, adjusting the pulse width of the above first scan signal to be greater than the above first pulse width. That is, referring to Figure 5 , in this embodiment, the pulse width in the case of low brightness in the effective light-emitting stage is increased, that is, its charging duration is reduced; while the pulse width in the case of high brightness in the effective light-emitting stage remains unchanged. This is beneficial for the brightness change curve of the light-emitting element at different brightness levels to be approximately symmetric, so as to facilitate realizing that one frame at a 30Hz refresh rate is equivalent to two frames at a 60Hz refresh rate, thereby further facilitating the improvement of the flicker problem.

[0062] Referring to Figure 6 , it shows the comparison of the turn-on times corresponding to equivalent one frame at a 30Hz refresh rate to two frames at a 60Hz refresh rate before adjustment. As Figure 6 can be seen, since any two of the four values LV.1, LV.2, LV.3, and LV.4 are not equal, that is, LV.1≠LV.2≠LV.3≠LV.4, it is impossible to realize equivalent one frame at a 30Hz refresh rate to two frames at a 60Hz refresh rate. Referring to Figure 7 , it shows the schematic diagram of the brightness change between two adjacent frames at a 30Hz refresh rate after adopting the above technical solution disclosed in the present invention. As Figure 7 can be seen, the turn-on times of two adjacent frames are the same. Referring to Figure 8 , it shows the comparison of the turn-on times corresponding to equivalent one frame at a 30Hz refresh rate to two frames at a 60Hz refresh rate after adopting the above technical solution disclosed in the present invention (30Hz is equivalent to two 60Hz). As Figure 8 can be seen, since LV.1, LV.2, LV.3, and LV.4 are all equal, that is, LV.1 = LV.2 = LV.3 = LV.4, based on the present invention, it is possible to realize equivalent one frame at a 30Hz refresh rate to two frames at a 60Hz refresh rate, which is further beneficial for improving the low-frequency flicker problem.

[0063] It should be noted that in the above embodiment of the present invention, the third reference voltage signal ELVSS and the first reference voltage signal VINT are negative potentials, and the second reference voltage signal ELVDD is a positive potential, that is, the second reference voltage signal ELVDD is output as the positive power supply voltage, and the third reference voltage signal ELVSS is output as the negative power supply voltage.

[0064] All the switching devices involved in the above embodiments of the present invention may employ P-type thin-film transistors or N-type thin-film transistors. And all the switching devices in the circuit are of the same type, that is, all are P-type thin-film transistors, or all are N-type thin-film transistors. When all are P-type thin-film transistors (i.e., P-type TFTs), the corresponding valid level signal is a low level, and the non-valid level signal is a high level. When all are N-type thin-film transistors (N-type TFTs), the corresponding valid level signal is a high level, and the non-valid level signal is a low level.

[0065] It should be noted that in this embodiment, the switching devices selected in the circuit design of this embodiment are all P-type TFTs, and the corresponding valid level signal is a low level, and the non-valid level signal is a high level. However, the present application is not limited to this type selection of the switching devices.

[0066] Furthermore, it should be noted that the first electrode of all the switching devices involved in the above embodiments of the present invention can be one of the source electrode and the drain electrode, and at the same time, the second electrode is the other of the source electrode and the drain electrode. That is, for example, when the first electrode is the source electrode, then the second electrode is the drain electrode. When the first electrode is the drain electrode, then the second electrode is the source electrode.

[0067] In specific implementation, other driving circuits can be designed and obtained for use by expanding based on this pixel driving circuit. The pixel driving circuit obtained based on this is also within the protection scope of the present invention.

[0068] An embodiment of the present invention also discloses a display panel, which includes the pixel driving circuit disclosed in any of the above embodiments. The detailed structural features and advantages of the pixel driving circuit can be referred to the description of the above embodiments, and will not be elaborated here.

[0069] In an optional embodiment, the display panel has multiple light-emitting elements, and the solution of the present application can improve the problem of uneven display caused by uneven light-emitting brightness of multiple light-emitting elements, reduce the visual flicker feeling, and thus improve the display effect.

[0070] Some embodiments of the present disclosure also provide a display device, which includes the above display panel.

[0071] The display device provided by the embodiments of the present disclosure may be any device that displays images whether in motion (e.g., video) or stationary (e.g., still images), and whether text or not. More specifically, it is expected that the above embodiments can be implemented in or associated with a variety of electronic devices. The above-mentioned variety of electronic devices include, for example but not limited to, mobile phones, wireless devices, personal data assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, video cameras, game consoles, watches, clocks, calculators, television monitors, flat panel displays, computer monitors, automotive displays (e.g., odometer displays, etc.), navigators, cockpit controllers and / or displays, displays of camera views (e.g., displays of rear view cameras in vehicles), electronic photos, electronic billboards or signs, projectors, architectural structures, packaging, and aesthetic structures, etc.

[0072] In summary, the pixel driving method, driving circuit, display panel, and display device of the present invention at least have the following advantages:

[0073] The pixel driving method, driving circuit, display panel, and display device disclosed in the embodiments of the present invention adjust the pulse width of the first scan signal in the initial light-emitting stage under low brightness; and set different working timings for the first scan signal according to different display brightnesses, so that the light-emitting element can quickly turn on in the initial light-emitting stage under low brightness, reducing the initial turn-on time in the early stage of each frame period under low brightness, making the turn-on time the same under different display brightnesses, and improving the low-frequency flicker problem of OLED products.

[0074] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A pixel driving method, characterized in that, Applied to a pixel driving circuit, the pixel driving circuit includes a light-emitting element, a first switching device for transmitting a driving current to the light-emitting element, and a reset transistor connected to the anode of the light-emitting element; the first switching device is connected to a first scan signal; the method includes the steps of: Providing a display panel; the display panel includes a plurality of sub-pixels; Determining an initial light-emitting stage of each frame period of the sub-pixels; Obtaining a display brightness value of the display panel; Obtaining a pulse width of the first scan signal when the display brightness value is greater than or equal to a first preset threshold in the initial light-emitting stage, as a first pulse width; In response to the display brightness value being less than the first preset threshold in the initial light-emitting stage, reducing the pulse width of the first scan signal to be equal to the first pulse width.

2. The pixel driving method according to claim 1, wherein The method further includes the steps of: Determining an effective light-emitting stage of each frame period of the sub-pixels; In response to the display brightness value being less than the first preset threshold in the effective light-emitting stage, adjusting the pulse width of the first scan signal to be greater than the first pulse width.

3. The pixel driving method according to claim 1, wherein, The reset transistor is connected to an initial reset signal; the method further includes the steps of: Increasing the pulse width of the initial reset signal in the initial light-emitting stage.

4. The pixel driving method according to claim 1, wherein The reset transistor is connected to an initial reset signal, the method further includes the steps of: Reducing the number of times the reset transistor is turned on in the initial light-emitting stage.

5. The pixel driving method according to claim 1, wherein In the initial light-emitting stage, the pulse waveform of the first scan signal when the display brightness value is less than the first preset threshold is the same as its pulse waveform when the display brightness value is greater than or equal to the first preset threshold.

6. The pixel driving method according to claim 3, wherein The increasing the pulse width of the initial reset signal in the initial light-emitting stage includes: Obtaining the pulse waveform of the initial reset signal before adjustment as a reference pulse waveform; Based on the reference pulse waveform, increasing the pulse width of the initial reset signal in the initial light-emitting stage.

7. The pixel driving method according to claim 6, wherein The method further includes the steps of: Determining an effective light-emitting stage of each frame period of the sub-pixels; Setting the pulse waveform of the initial reset signal in the effective light-emitting stage to be the same as the pulse waveform of the reference pulse waveform in the effective light-emitting stage.

8. The pixel driving method according to claim 1, wherein The reset transistor is further connected to a first reference voltage signal, the pixel driving circuit further includes a driving transistor, and the driving transistor is respectively connected to a second reference voltage signal and the first switching device.

9. A pixel driving circuit, characterized in that, The pixel driving circuit includes a light-emitting element, a first switching device for transmitting a driving current to the light-emitting element, and a reset transistor connected to the anode of the light-emitting element; the first switching device is connected to a first scan signal; the pixel driving circuit is driven based on the pixel driving method according to any one of claims 1-8.

10. A display panel, characterized in that, The display panel includes the pixel driving circuit according to claim 9.

11. A display device, characterized in that, Including the display panel according to claim 10.

Images