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

Abstract

The application provides a pixel driving method, a driving circuit, a display panel and a display device. The pixel driving method comprises the following steps: providing a 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; obtaining a pulse width of the first scanning signal as a first pulse width in the case that the display brightness value is greater than or equal to a first preset threshold in the initial light-emitting stage; in response to the case that the display brightness value is less than the first preset threshold in the initial light-emitting stage, reducing the pulse width of the first scanning signal to be equal to the first pulse width. The application reduces the light-emitting element start-up time in the early stage of each frame period under low brightness conditions, so that the start-up time under different brightness in a frame period is the same, and the low-frequency flicker problem of the OLED product is improved.

Description

TECHNICAL FIELD

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

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

[0003] Organic Light Emitting Diode needs current driving, that is, OLED is a current-controlled device, and its brightness is proportional to the average time of current passing. When the current is not up to the light-emitting threshold of OLED, the light-emitting brightness of the device is small, and when the current reaches the light-emitting threshold, the light-emitting intensity of OLED will increase with the increase of current. An OLED unit can be simplified as a LED and a parasitic capacitor in parallel. In order to make OLED emit light, the current source first charges the parasitic capacitor to the light-emitting voltage of OLED, and 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 in switching between frames. For OLED products with variable frequency display, at low gray scale, the OLED light-emitting current is small, and the OLED parasitic capacitor cannot be quickly charged. In a long period of each frame, the OLED light-emitting element cannot reach the highest brightness. In the case of low refresh rate display, the start-up time of different DBV (display brightness value) in each frame period is quite different, which may cause brightness flicker problem.

[0005] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information which does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0006] Therefore, the present application provides a pixel driving method and driving circuit, display panel and display device to solve the problem of flicker caused by the large difference in start-up time of different DBV in a frame period.

[0007] According to one aspect of the present application, a pixel driving method is provided, which is applied to a pixel driving circuit, the pixel driving circuit comprising a light-emitting element, a first switching device for transmitting 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 comprises the steps of:

[0008] A display panel is provided; the display panel comprises a plurality of sub-pixels;

[0009] An initial light-emitting stage of each frame period of the sub-pixel is determined;

[0010] A display brightness value of the display panel is obtained;

[0011] In a case where the display brightness value is greater than or equal to a first preset threshold in the initial light-emitting stage, a pulse width of the first scanning signal is obtained as a first pulse width;

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

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

[0014] An effective light-emitting stage of each frame period of the sub-pixel is determined;

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

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

[0017] In the initial light-emitting stage, the pulse width of the initial reset signal is increased.

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

[0019] In the initial light-emitting stage, the number of times of turning on the reset transistor is reduced.

[0020] Optionally, in the initial light-emitting stage, the pulse waveform of the first scanning signal in a case where the display brightness value is less than the first preset threshold is the same as the pulse waveform of the first scanning signal in a case where the display brightness value is greater than or equal to the first preset threshold.

[0021] Optionally, the increasing the pulse width of the initial reset signal in the initial light-emitting stage comprises:

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

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

[0024] Optionally, the method further comprises the step of:

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

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

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

[0028] According to another aspect of the present application, there is provided a pixel driving circuit comprising a light emitting element, a first switch 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 switch device is connected to a first scan signal; the pixel driving circuit is driven based on any of the pixel driving methods described above.

[0029] According to another aspect of the present application, there is provided a display panel comprising the pixel driving circuit described above.

[0030] According to another aspect of the present application, there is provided a display device comprising the display panel described above.

[0031] The present application has the following advantages compared with the prior art:

[0032] The pixel driving method and driving circuit, display panel and display device provided by the present application adjust the pulse width of the first scan signal in the initial light emitting phase under low brightness condition; and set different working timing of the first scan signal according to different display brightness, so that the light emitting element under low brightness condition starts to emit light quickly in the initial light emitting phase, reduces the start-up time in the early stage of each frame period under low brightness condition, makes the start-up time under different display brightness the same, and improves the low frequency flicker problem of OLED products. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles behind the present application. It is apparent that the accompanying drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0034] Figure 1 A structural schematic diagram of a pixel driving circuit disclosed for an embodiment of the present application;

[0035] Figure 2 A timing diagram showing the time delay of light emission in an embodiment of the present application;

[0036] Figure 3 A flow diagram of a pixel driving method according to an embodiment of the present application;

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

[0038] Figure 5 A timing diagram showing the operation of the first scan signal in low brightness, the first scan signal in high brightness, and the initial reset signal after adjustment according to the present application;

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

[0040] Figure 7 A diagram showing the brightness change of two adjacent frames at 30Hz refresh rate according to an embodiment of the present application;

[0041] Figure 8 A comparison diagram showing the light-on time corresponding to the case where one frame at 30Hz refresh rate is equivalent to two frames at 60Hz refresh rate after adjustment according to the present application. DETAILED DESCRIPTION

[0042] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any

[0043] The terms "one", "a", "the", "said", and "at least one" are used to indicate the existence of one or more elements / components / etc.; the terms "including", "having", and "with" are used to indicate an open-ended inclusion of at least the listed elements / components / etc. and do not exclude additional elements / components / etc.

[0044] Figure 1 A pixel driving circuit in an embodiment of the present application 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 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 gray scale voltage to the gate of the driving transistor T2, the driving transistor T2 is turned on. The size of the current passing through the driving transistor T2 determines the driving current of the gray scale, thereby realizing display of different brightness.

[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 scanning 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 turn-on and turn-off of the reset transistor T3. The first scanning signal EM controls the turn-on and turn-off of the first switching device T1. The signal EM is a periodic 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 picture at a certain frequency in 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 via the first switching device T1, resulting in the brightness of the light emitting element D1 being reduced to zero, thereby generating a black picture.

[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 capacitor C OLED between the anode and the cathode of the light emitting element D1.

[0048] Specific reference Figure 2 As shown in the diagram, 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 high, the light-emitting element D1 is not working, and the parasitic capacitance C of the reset transistor T3 to the light-emitting element D1 is... OLED A discharge operation is performed to prevent contrast degradation. When the initial reset signal S... n When the signal is set to high, the EM signal is set to low, the reset process ends, and the light-emitting element D1 enters the effective light-emitting stage. However, due to the parasitic capacitance C... OLED The presence of this current means that during the light-emitting stage, the driving current I that should flow from the anode to the cathode of the light-emitting element D1 to make the light-emitting element D1 emit light is... OLED First, consider the parasitic capacitance C. OLED The charge is applied before the current flows through the light-emitting element D1, causing D1 to enter the effective light-emitting stage, resulting in a delayed light-emitting time t in the OLED light-emitting element D1. DELAY .

[0049] Therefore, in the initial stage of the frame period, due to the parasitic capacitance C OLED During the charging process, there is a certain time delay in the light emission of the light-emitting element D1. Figure 2 This is represented by the anode voltage V of the OLED light-emitting element D1. ANODE During the initial phase of the frame period, the luminance (Luminance) of the OLED light-emitting element D1 slowly increases to a predetermined value, exhibiting a delayed emission time t during this initial phase. DELAY The time period corresponding to this delayed emission time is the initial emission stage, and the stage after the initial emission stage where the OLED light-emitting element emits light normally is the effective emission stage.

[0050] Delayed emission time t DELAY Specifically, it is determined according to the following formula (1):

[0051]

[0052] Where V F It 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 that ensures the OLED light-emitting element D1 emits light normally.

[0053] Delayed emission time t DELAY It exhibits grayscale dependence, and under high grayscale display conditions (driving current I... OLED High) Delayed emission time t DELAY It is a very small value and can be ignored.

[0054] likeFigure 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. (Refer to...) Figure 3 As shown, the pixel driving method in this embodiment mainly includes: S110, providing a display panel. The display panel includes multiple sub-pixels. S120, determining the initial light-emitting stage of each frame cycle of the sub-pixels. S130, obtaining the display brightness value of the display panel. S140, obtaining the 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 the first pulse width. S150, 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. That is, increasing the charging time when the display brightness value is less than the first preset threshold in the initial light-emitting stage, achieving the effect of rapid light-emitting element illumination.

[0055] In step S120 above, the initial emission stage is the aforementioned delayed emission time t. DELAY The corresponding stage is the stage when the OLED light-emitting element D1 lights up. In step S130 above, the display brightness value is DBV (display brightness value). The purpose of step S150 above is to ensure that, in the initial light-emitting stage, the pulse width of the EM signal when the display brightness value is less than the first preset threshold is 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 display brightness value being less than the first preset threshold can be understood as a low brightness situation, and the display brightness value being greater than or equal to the first preset threshold can be understood as a high brightness situation.

[0057] That is, in this embodiment, reference Figure 4 EM1 is the waveform of the first scan signal when the display brightness value before adjustment is less than the first preset threshold, i.e., the waveform of the first scan signal under low brightness conditions. EM2 is the waveform of the first scan signal when the display brightness value before adjustment is greater than or equal to the first preset threshold, i.e., the waveform of the first scan signal under high brightness conditions. The time the EM pulse signal is at a low level is the charging time of the light-emitting element. (Reference) Figure 4It can be seen that the charging time of the light emitting element in the low brightness case is obviously less than the charging time of the light emitting element in the high brightness case, that is, the light-on time in the low brightness case is greater than the light-on time in the high brightness case, and the light-on time is different. Further, this also makes it impossible to realize that one frame in the 30Hz refresh rate case is equivalent to two frames in the 60Hz refresh rate case, which is not conducive to the implementation of the technical solution corresponding to the idea of relying on equivalent to improve the refresh rate to solve the flicker problem. Exemplarily, the first preset threshold value can be 50 nit, but the present application is not limited thereto.

[0058] Reference Figure 5 , EM3 is the waveform of the first scanning signal in the adjusted low brightness case. EM4 is the waveform of the first scanning signal in the adjusted high brightness case. In the implementation process of the technical solution of the embodiment of the present application, the pulse waveform of the first scanning signal in the high brightness case remains unchanged in the initial light emitting stage and the effective light emitting stage. In the low brightness case, the pulse waveform of the first scanning signal in the initial light emitting stage and the effective light emitting stage has changed.

[0059] Specifically, continuing to refer to Figure 4 and Figure 5 , in the low brightness case, because the OLED charging time is short, the brightness will gradually increase from the initial light emitting stage to the effective light emitting stage, and in the initial light emitting stage, the pulse width of the first scanning signal in the low brightness case is reduced. In the effective light emitting stage, the pulse width of the first scanning 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 is smaller. That is, the charging time of the light emitting element in the initial light emitting stage in the low brightness case is increased, achieving the effect of fast light-on of the light emitting element. Reducing the light emitting brightness in the effective light emitting stage facilitates subsequent realization of equivalent of one frame in the 30Hz refresh rate case to two frames in the 60Hz refresh rate case, and makes the two equivalent 60Hz brightness corresponding to 30Hz equal as much 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 scanning signal in the low brightness case is the same as the pulse waveform in the high brightness case. This is conducive to further ensuring that the light-on time of the light emitting element is the same under different brightness, facilitating subsequent realization of equivalent of one frame in the 30Hz refresh rate case to two frames in the 60Hz refresh rate case, thereby facilitating further improvement of the flicker problem.

[0061] Another embodiment of the present application discloses another pixel driving method. The method is described above Figure 3On the basis of the corresponding embodiment, further comprising steps: S160, determining the effective light-emitting phase of each frame period of the sub-pixel. S170, in response to the display brightness value in the effective light-emitting phase being less than a first preset threshold, adjusting the pulse width of the first scanning signal to be greater than the first pulse width. That is, referring to Figure 5 The embodiment increases the pulse width in the case of low brightness in the effective light-emitting phase, that is, reduces the charging time; and the pulse width in the case of high brightness in the effective light-emitting phase remains unchanged. This is conducive to the brightness change curve of the light-emitting element under different brightness being approximately symmetrical, thereby facilitating the implementation of one frame under 30Hz refresh rate being equivalent to two frames under 60Hz refresh rate, thereby facilitating the further improvement of the flicker problem.

[0062] Reference Figure 6 It shows the comparison of the light-on time corresponding to the case of one frame under 30Hz refresh rate being equivalent to two frames under 60Hz refresh rate before adjustment. From Figure 6 It can be known that, 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, one frame under 30Hz refresh rate cannot be equivalent to two frames under 60Hz refresh rate. Reference Figure 7 It shows the brightness change diagram of adjacent two frames under 30Hz refresh rate after the above technical solution of the present application is adopted. From Figure 7 It can be known that, the light-on time of adjacent two frames is the same. Reference Figure 8 It shows the comparison of the light-on time corresponding to the case of one frame under 30Hz refresh rate being equivalent to two frames under 60Hz refresh rate after the above technical solution of the present application is adopted (30Hz is equivalent to two 60Hz). From Figure 8 It can be known that, since LV.1, LV.2, LV.3 and LV.4 are equal, that is, LV.1=LV.2=LV.3=LV.4, one frame under 30Hz refresh rate can be equivalent to two frames under 60Hz refresh rate based on the present application, which is further conducive to the improvement of the low-frequency flicker problem.

[0063] It should be noted that, in the above embodiment of the present application, 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 a positive power voltage, and the third reference voltage signal ELVSS is output as a negative power voltage.

[0064] All the switch devices involved in the above embodiments of the present application can adopt P-type thin film transistors or N-type thin film transistors. And all the switch devices in the circuit are of the same type, i.e. all P-type thin film transistors or all N-type thin film transistors. When all are P-type thin film transistors (i.e. P-type TFTs), the corresponding active level signal is low and the non-active level signal is high. When all are N-type thin film transistors (i.e. N-type TFTs), the corresponding active level signal is high and the non-active level signal is low.

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

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

[0067] In the specific implementation, other drive circuits can be designed based on the pixel drive circuit as a basis for expansion. The pixel drive circuit obtained based on this is also within the protection scope of the present application.

[0068] An embodiment of the present application also discloses a display panel, which comprises the pixel drive circuit disclosed in any of the above embodiments. The detailed structure features and advantages of the pixel drive circuit can be referred to the description of the above embodiments, which will not be described here again.

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

[0070] Some embodiments of the present application also provide a display device, which comprises the display panel described above.

[0071] The display apparatus provided by the embodiments of the present disclosure can be any apparatus that displays images whether moving (e.g., video) or fixed (e.g., still images) and whether text or graphics. More specifically, it is contemplated that the above-described embodiments can be implemented in and / or associated with a variety of electronic devices. Such devices include, but are not limited to, mobile telephones, wireless devices, personal data assistants (PDAs), hand-held or pocket computers, GPS receivers / navigators, cameras, MP4 video players, camcorders, game consoles, watches, clocks, calculators, television monitors, flat-panel displays, computer monitors, auto displays (e.g., odometer display, etc.), cockpit controls and / or displays, camera view displays (e.g., display of a rear view camera in a vehicle), electronic photographs, electronic billboards or signs, projectors, architectural structures, packaging, and aesthetic structures (e.g., a display of a picture or text art image on a refrigerator, a statue, a package, etc.).

[0072] In summary, the pixel driving method and driving circuit, display panel and display apparatus provided by the embodiments of the present disclosure have at least the following advantages:

[0073] The pixel driving method and driving circuit, display panel and display apparatus disclosed by the embodiments of the present disclosure adjust the pulse width of the first scanning signal in the initial light-emitting stage under low brightness, and set different working timing of the first scanning signal according to different display brightness, so that the light-emitting element under low brightness quickly lights up in the initial light-emitting stage, reduces the light-up time in the early stage of each frame period under low brightness, makes the light-up time under different display brightness the same, and improves the low-frequency flicker problem of OLED products.

[0074] The above is a further detailed description of the present disclosure in combination with specific preferred embodiments, and the specific implementation of the present disclosure cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present disclosure belongs, some simple deductions or replacements can be made without departing from the concept of the present disclosure, and all of them should be regarded as falling within the protection scope of the present disclosure.

Claims

1. A pixel driving method, characterized by, The method is applied to a pixel driving circuit, the pixel driving circuit comprising a light emitting element, a first switch device transmitting a driving current to the light emitting element, and a reset transistor connected to an anode of the light emitting element; the first switch device is connected to a first scan signal; the method comprises the steps of: providing a display panel; the display panel comprises a plurality of sub-pixels; determining an initial light emitting stage of each frame period of the sub-pixel; obtaining a display brightness value of the display panel; obtaining a pulse width of the first scan signal in a case that 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 comprises the steps of: determining an effective light emitting stage of each frame period of the sub-pixel; 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 comprises the steps of: increasing a 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 comprises the steps of: reducing a number of times of turning on the reset transistor in the initial light emitting stage.

5. The pixel driving method according to claim 1, wherein In the initial light emitting stage, a pulse waveform of the first scan signal in a case that the display brightness value is less than the first preset threshold is the same as a pulse waveform of the first scan signal in a case that 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 comprises: obtaining a pulse waveform of the initial reset signal before adjustment as a reference pulse waveform; increasing the pulse width of the initial reset signal in the initial light emitting stage based on the reference pulse waveform.

7. The pixel driving method according to claim 6, wherein The method further comprises the steps of: determining an effective light emitting stage of each frame period of the sub-pixel; 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.

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

9. A pixel driving circuit, characterized by comprising: The pixel driving circuit comprises a light emitting element, a first switch device transmitting a driving current to the light emitting element, and a reset transistor connected to an anode of the light emitting element; the first switch 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 by, The display panel comprises the pixel driving circuit according to claim 9.

11. A display device, characterized by comprising: The display panel according to claim 10.

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