A display panel, a driving method thereof, and a display device

Abstract

The present invention discloses a display panel, a driving method thereof, and a display device. The pixel circuit in the display panel includes a driving transistor, an initialization transistor, and an initialization signal line. The initialization signal terminal is electrically connected to the first end of the initialization transistor and the initialization signal line respectively. The first end of the driving transistor is electrically connected to the power supply signal terminal, the second end is electrically connected to the first end of the light-emitting element, and the gate is electrically connected to the second end of the initialization transistor. The driving mode of the display panel includes at least a first driving mode, a second driving mode, and a third driving mode. The first driving mode corresponds to a first driving frequency F1 and a first initialization signal V ref1 , the second driving mode corresponds to a second driving frequency F2 and a second initialization signal V ref2 , the third driving mode corresponds to a third driving frequency F3 and a third initialization signal V ref3 , F1 > F2 > F3, V ref1 ≠ V ref2 ≠ V ref3 , #imgabs0##imgabs1# By adopting a dynamically changing initialization signal, the brightness difference between different frequencies can be reduced, and the display effect can be improved.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and in particular, to a display panel, a driving method thereof, and a display device. Background Art

[0002] During the display process of a display device, it may be necessary to switch between different driving frequencies, for example, from a higher frequency to a lower frequency, or from a lower frequency to a higher frequency, to meet different display requirements.

[0003] However, there are differences in display brightness between different driving frequencies, resulting in a problem that the change in display brightness is perceptible to the human eye when switching between different driving frequencies, affecting the normal display of the display device and the user experience. Summary of the Invention

[0004] Embodiments of the present invention provide a display panel, a driving method thereof, and a display device. By setting different initialization signals in different driving modes, the difference in display brightness in different driving modes is adjusted, and the display effect of the display device is improved.

[0005] In a first aspect, an embodiment of the present invention provides a display panel, including a light-emitting element and a pixel circuit electrically connected to the light-emitting element;

[0006] The pixel circuit includes a driving transistor and an initialization transistor. A first end of the initialization transistor is electrically connected to an initialization signal terminal, a second end of the initialization transistor is electrically connected to a gate of the driving transistor, a first end of the driving transistor is electrically connected to a power supply signal terminal, and a second end of the driving transistor is electrically connected to a first end of the light-emitting element; the display panel further includes an initialization signal line electrically connected to the initialization signal terminal for transmitting an initialization signal to the initialization signal terminal; at least three driving modes of the display panel include a first driving mode, a second driving mode, and a third driving mode. The first driving mode corresponds to a first driving frequency F1 and a first initialization signal V ref1 , the second driving mode corresponds to a second driving frequency F2 and a second initialization signal V ref2 , and the third driving mode corresponds to a third driving frequency F3 and a third initialization signal V ref3 ; where F1 > F2 > F3, and V ref1 ≠V ref2 ≠V ref3 ,

[0007] In a second aspect, an embodiment of the present invention further provides a driving method for a display panel, used to drive the display panel in the first aspect. The driving method includes:

[0008] In the first driving mode, the pixel circuit is driven by a first driving frequency and a first initialization signal;

[0009] In the second driving mode, the pixel circuit is driven by a second driving frequency and a second initialization signal;

[0010] In the third driving mode, the pixel circuit is driven by a third driving frequency and a third initialization signal;

[0011] Among them, the first driving frequency F1, the first initialization signal V ref1 , the second driving frequency F2, the second initialization signal V ref2 , the third driving frequency F3 and the third initialization signal V ref3 satisfy: F1 > F2 > F3, and V ref1 ≠ V ref2 ≠ V ref3 ,

[0012] Thirdly, an embodiment of the present invention further provides a display device, including the display panel described in the first aspect.

[0013] An embodiment of the present invention provides a display panel. By setting that the display panel includes at least three different driving modes, and the first driving frequency F1 and the first initialization signal V in the first driving mode ref1 , the second driving frequency F2 and the second initialization signal V in the second driving mode ref2 , and the third driving frequency F3 and the third initialization signal V in the third driving mode ref3 satisfy F1 > F2 > F3, and V ref1 ≠ V ref2 ≠ V ref3 , that is, by setting that the initialization signals in different driving modes are different to adjust the display brightness difference in different driving modes, and further by setting that the change degrees of the driving frequencies in different driving modes are different from the change degrees of the initialization signals to further adjust the display brightness in different driving modes, reduce the display brightness difference of the display panel at different driving frequencies, and improve the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the change in display brightness at different driving frequencies in the prior art;

[0015] Figure 2 is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0016] Figure 3 is a schematic circuit diagram of a pixel circuit provided by an embodiment of the present invention;

[0017] Figure 4 It is a schematic diagram of the driving timing of a pixel circuit provided by an embodiment of the present invention;

[0018] Figure 5 It is a schematic diagram of the change in display brightness at different driving frequencies provided by an embodiment of the present invention;

[0019] Figure 6 It is another schematic diagram of the driving timing of a pixel circuit provided by an embodiment of the present invention;

[0020] Figure 7 It is a schematic diagram of the correspondence between an initialization signal and display brightness provided by an embodiment of the present invention;

[0021] Figure 8 It is another schematic diagram of the driving timing of a pixel circuit provided by an embodiment of the present invention;

[0022] Figure 9 It is another schematic diagram of the driving timing of a pixel circuit provided by an embodiment of the present invention;

[0023] Figure 10 It is a schematic diagram of the flow of a driving method for a pixel circuit provided by an embodiment of the present invention;

[0024] Figure 11 It is another schematic diagram of the driving timing of a pixel circuit provided by an embodiment of the present invention;

[0025] Figure 12 It is a schematic diagram of the structure of a display device provided by an embodiment of the present invention. Detailed implementation manners

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description, although some specific embodiments of the present invention, for those skilled in the art, can be extended and extended to other structures and drawings according to the basic concepts of the device structure, driving method, and manufacturing method disclosed and prompted by various embodiments of the present invention. Without doubt, these should all be within the scope of the claims of the present invention.

[0027] Figure 1 It is a schematic diagram of the change in display brightness at different driving frequencies in the prior art. As Figure 1 shown, curve 1 represents the curve of the display brightness of the display panel changing with time when the driving frequency is 120HZ, and curve 2 represents the curve of the display brightness of the display panel changing with time when the driving frequency is 40HZ. As Figure 1As shown, with the passage of time, the emission brightness of the display panel decays, and there are significant differences in the display brightness of the display panel at different driving frequencies. For example, when the driving frequency drops from 120 HZ to 60 HZ, the emission brightness of the display panel changes by 1%. When the driving frequency drops from 120 HZ to 40 HZ, the emission brightness of the display panel changes by 2%. When the driving frequency drops from 120 HZ to 30 HZ, the emission brightness of the display panel changes by 3%. Thus, when the display panel switches between different driving frequencies, due to the inconsistent decline in brightness, it causes a visible brightness change to the human eye, affecting the user experience.

[0028] It should be noted that the dashed part in Curve 1 also represents the curve of the display brightness of the display panel changing with time when the driving frequency is 120 HZ. Since it coincides with the curve of the display brightness of the display panel changing with time when the driving frequency is 40 HZ, it is represented by a dashed line. Figure 1 The hatched part can represent the brightness difference between the display brightness of the display panel when the driving frequency is 120 HZ and the display brightness of the display panel when the driving frequency is 40 HZ.

[0029] Based on the above technical problems, an embodiment of the present invention provides a display panel, including a light-emitting element and a pixel circuit electrically connected to the light-emitting element; the pixel circuit includes a driving transistor and an initialization transistor. The first end of the initialization transistor is electrically connected to the initialization signal terminal, the second end of the initialization transistor is electrically connected to the gate of the driving transistor, the first end of the driving transistor is electrically connected to the power supply signal terminal, and the second end of the driving transistor is electrically connected to the first end of the light-emitting element; the display panel further includes an initialization signal line electrically connected to the initialization signal terminal for transmitting an initialization signal to the initialization signal terminal; the driving mode of the display panel at least includes a first driving mode, a second driving mode, and a third driving mode. The first driving mode corresponds to a first driving frequency F1 and a first initialization signal V ref1 , the second driving mode corresponds to a second driving frequency F2 and a second initialization signal V ref2 , and the third driving mode corresponds to a third driving frequency F3 and a third initialization signal V ref3 ; where F1 > F2 > F3, and V ref1 ≠V ref2 ≠V ref3 , Adopting the above technical solution, by setting the display panel to include at least three different driving modes, and the first driving frequency F1 and the first initialization signal V in the first driving mode ref1 , the second driving frequency F2 and the second initialization signal V in the second driving mode ref2 , and the third driving frequency F3 and the third initialization signal V in the third driving mode ref3Satisfy F1 > F2 > F3, and V ref1 ≠ V ref2 ≠ V ref3 , That is, by setting different initialization signals in different driving modes to adjust the display brightness difference in different driving modes, and further by setting the change degree of the driving frequency in different driving modes to be different from the change degree of the initialization signal to further adjust the display brightness in different driving modes, reduce the display brightness difference at different driving frequencies of the display panel, and improve the display effect.

[0030] The above is the core idea of the present invention. Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0031] Figure 2 is a schematic structural diagram of a display panel provided by an embodiment of the present invention, Figure 3 is a schematic circuit diagram of a pixel circuit provided by an embodiment of the present invention, Figure 4 is a schematic driving timing diagram of a pixel circuit provided by an embodiment of the present invention, Figure 5 is a schematic diagram of the display brightness change at different driving frequencies provided by an embodiment of the present invention. Combining Figures 2 - 5 as shown, the display panel 10 provided by the embodiment of the present invention includes a light-emitting element 11 and a pixel circuit 12 electrically connected to the light-emitting element 11; the pixel circuit 12 includes a driving transistor M3 and an initialization transistor M5. The first end of the initialization transistor M5 is electrically connected to the initialization signal terminal VREF1, the second end of the initialization transistor M5 is electrically connected to the gate of the driving transistor M3, the first end of the driving transistor M3 is electrically connected to the power supply signal terminal PVDD, and the second end of the driving transistor M3 is electrically connected to the first end of the light-emitting element 11; the display panel 10 further includes an initialization signal line 13, and the initialization signal line 13 is electrically connected to the initialization signal terminal VREF1 for transmitting an initialization signal to the initialization signal terminal VREF1; the driving modes of the display panel 10 at least include a first driving mode, a second driving mode, and a third driving mode. The first driving mode corresponds to a first driving frequency F1 and a first initialization signal V ref1 , the second driving mode corresponds to a second driving frequency F2 and a second initialization signal V ref2 , and the third driving mode corresponds to a third driving frequency F3 and a third initialization signal V ref3 ; wherein, F1 > F2 > F3, and V ref1 ≠ V ref2 ≠ V ref3 ,

[0032] Specifically, the display panel 10 includes a light-emitting element 11 and a pixel circuit 12 that are electrically connected to each other. The pixel circuit 12 is used to drive the light-emitting element 11 to emit light. Optionally, the light-emitting element 11 can be an organic light-emitting element or a micro light-emitting element, and the specific type of the light-emitting element 11 in the embodiments of the present invention is not limited.

[0033] Optionally, the pixel circuit 12 can include multiple thin-film transistors and at least one storage capacitor. For example, the pixel circuit 12 can include seven thin-film transistors and a storage capacitor to form a "7T1C" pixel circuit. Alternatively, the pixel circuit 12 can also include other numbers of thin-film transistors and storage capacitors to form a "5T1C" pixel circuit or a "6T2C" pixel circuit. The specific setting manner of the pixel circuit 12 in the embodiments of the present invention is not limited. Figure 3 Only the "7T1C" pixel circuit included in the pixel circuit is taken as an example for illustration. As Figure 3 shown, the pixel circuit 12 includes a first light-emitting control transistor M1, a data signal writing transistor M2, a driving transistor M3, a threshold supplement transistor M4, an initialization transistor M5, a first light-emitting control transistor M6, a reset transistor M7, and a storage capacitor Cst. The working process of the pixel circuit 12 can include an initialization stage, a data signal writing stage, and a light-emitting stage. Specifically, in the initialization stage, the signal input to the first scan signal terminal Scan1 is an enable signal, and the signals input to the second scan signal terminal Scan2 and the light-emitting control signal terminal Emit are non-enable signals. At this time, the initialization transistor M5 is turned on, and the initialization signal V on the initialization signal line 13 ref is written to one of the capacitor substrates of the storage capacitor Cst and the gate of the driving transistor M3, that is, the first node N1. At this time, the potential of the gate of the driving transistor M3 is also the initialization signal V ref , and this initialization signal controls the conduction degree of the driving transistor M3. In the data signal writing stage, the signal input to the second scan signal terminal Scan2 is an enable signal, and the signals input to the first scan signal terminal Scan1 and the light-emitting control signal terminal Emit are non-enable signals. At this time, the data signal writing transistor M2 and the threshold supplement transistor M4 are turned on. At the same time, the potential of the gate of the driving transistor M3 is the initialization signal V ref , and this initialization signal V ref controls the driving transistor M3 to also be turned on. The data signal input from the data signal input terminal Vdata passes through the data signal writing transistor M2, the driving transistor M3, and the threshold supplement transistor M4 and is applied to the first node N1. The potential of the first node N1 is gradually raised by the data signal. When the voltage difference between the gate voltage and the source voltage of the driving transistor M3 is less than or equal to the threshold voltage V of the driving transistor M3 thAt this time, the driving transistor M3 will be in the cut-off state. Meanwhile, during the data signal voltage writing stage, the reset transistor M7 is also turned on, and the reset transistor M7 will initialize the initialization signal V on the initialization signal line 13 ref to the first pole (for example, the first pole) of the light-emitting element 11, and initialize the potential of the first pole of the light-emitting element 11, which can reduce the influence of the voltage of the first pole of the light-emitting element 11 in the previous frame on the voltage of the first pole of the light-emitting element 11 in the next frame, and further improve the display uniformity. During the light-emitting stage, the signal input to the light-emitting control signal terminal Emit is an enable signal, and the signals input to the first scan signal terminal Scan1 and the second scan signal terminal Scan2 are non-enable signals. At this time, the first light-emitting control transistor M1 and the second light-emitting control transistor M6 are turned on, and the driving current generated by the driving transistor M3 drives the light-emitting element 11 to emit light. Based on the description of the above working process, it can be known that when the initialization signal V ref is different, the initialization degree of the driving transistor M3 is different. Thus, during the data signal writing stage, the data signals written into the gate of the driving transistor M3 are different. Furthermore, during the light-emitting stage, the gate-source voltage difference of the driving transistor is different, the driving current generated by the driving transistor M3 is different, and the light-emitting brightness of the light-emitting element 11 is controlled differently.

[0034] It should be noted that Figure 3 taking the case where each of the transistors M1 - M7 is a P-type transistor as an example for illustration. Correspondingly, the enable signal corresponding to each transistor is a low-level signal. Each of the transistors M1 - M7 can also be an N-type transistor. At this time, the enable signal corresponding to each transistor is a high-level signal. The embodiments of the present invention do not limit the type of each transistor. Meanwhile, in order to avoid the leakage current of the threshold compensation transistor M4 and the initialization transistor M5 from affecting the gate potential of the driving transistor M3, the threshold compensation transistor M4 and the initialization transistor M5 can also be set as double-gate transistors or N-type transistors (not shown in the figure) to ensure that the light emission of the light-emitting element is not affected by the leakage current.

[0035] As can be known from the above description, the decrease amplitude of the display brightness of the display panel at different driving frequencies is inconsistent, resulting in different display brightnesses of the display panel at different driving frequencies. And combined with Figure 1 it can be known that the greater the driving frequency, the greater the display brightness of the display panel, and the smaller the driving frequency, the smaller the display brightness of the display panel. Thus, combined with the influence of the above initialization signal V ref on the light-emitting brightness, therefore, by setting the initialization signal V at different driving frequencies refThe display brightness difference at different driving frequencies is adjusted differently, that is, different from the prior art where the initialization signals are the same at different driving frequencies. In the embodiments of the present invention, the initialization signals that are dynamically adjusted at different driving frequencies are creatively set. By adjusting the initialization signals that are dynamically adjusted, the display brightness at different driving frequencies is adjusted, the display brightness difference at different driving frequencies of the display panel is reduced, and the display effect is improved.

[0036] Specifically, the driving modes of the display panel 10 at least include a first driving mode, a second driving mode, and a third driving mode. The first driving mode corresponds to a first driving frequency F1 and a first initialization signal V ref1 , the second driving mode corresponds to a second driving frequency F2 and a second initialization signal V ref2 , and the third driving mode corresponds to a third driving frequency F3 and a third initialization signal V ref3 . Among them, the first driving frequency F1 is greater than the second driving frequency F2, the second driving frequency F2 is greater than the third driving frequency F3, and the first initialization signal V ref1 , the second initialization signal V ref2 , and the third initialization signal V ref3 are all different, that is, F1 > F2 > F3, V ref1 ≠ V ref2 ≠ V ref3 , that is, the initialization signals corresponding to different driving frequencies are different. In this way, the display brightness at different driving frequencies is adjusted through the dynamically changing initialization signals, the display brightness difference at different driving frequencies of the display panel is reduced, and the display effect is improved. It should be noted that the driving frequency here can be understood as the display refresh frequency of the display panel, that is, the number of display picture frames displayed by the display panel per second. For example, F1 can be 120HZ, F2 can be 60HZ, and F3 can be 30HZ. The embodiments of the present invention do not limit the specific values of the first driving frequency F1, the second driving frequency F2, and the third driving frequency F3.

[0037] On this basis, that is, the degree of change of the initialization signal is different from the degree of change of the driving frequency. In this way, the display brightness at different driving frequencies is further adjusted through the dynamically changing initialization signals, the display brightness difference at different driving frequencies of the display panel is reduced, and the display effect is improved.

[0038] Exemplarily, as Figure 4 and Figure 5 shown, Figure 4 corresponding to Figure 3 the case where each transistor in Figure 5Curve 3 in the figure represents the curve of the display brightness of the display panel changing with time when the driving frequency is 120 HZ, curve 4 represents the curve of the display brightness of the display panel changing with time when the driving frequency is 40 HZ, and the hatched part can represent the brightness difference between the display brightness of the display panel when the driving frequency is 120 HZ and the display brightness of the display panel when the driving frequency is 40 HZ. Specifically, Figure 5 The hatched part on the left in the figure can be understood as the situation where the display brightness of the display panel when the driving frequency is 40 HZ is greater than the display brightness of the display panel when the driving frequency is 120 HZ, and the hatched part on the right can be understood as the situation where the display brightness of the display panel when the driving frequency is 120 HZ is greater than the display brightness of the display panel when the driving frequency is 40 HZ. Therefore, by setting different initialization signals corresponding to different driving frequencies and different degrees of change of the initialization signal from the degree of change of the driving frequency, the display brightness difference in different driving modes can be neutralized, the display brightness difference of the display panel at different driving frequencies can be reduced or eliminated, and the display effect can be improved. For example, by setting different initialization signals corresponding to different driving frequencies and different degrees of change of the initialization signal from the degree of change of the driving frequency, when the driving frequency drops from 120 HZ to 60 HZ, the luminous brightness of the display panel changes by 0.5%, when the driving frequency drops from 120 HZ to 40 HZ, the luminous brightness of the display panel changes by 0.5%, when the driving frequency drops from 120 HZ to 30 HZ, the luminous brightness of the display panel changes by 0.5%. The change in display brightness caused by the change in driving frequency under the dynamic adjustment of the initialization signal is much smaller than the change in display brightness caused by the change in driving frequency when the initialization signal remains unchanged in the prior art.

[0039] In summary, the display panel provided by the embodiment of the present invention adjusts the display brightness difference in different driving modes by setting different initialization signals in different driving modes, and further adjusts the display brightness in different driving modes by setting different degrees of change of the driving frequency and the initialization signal in different driving modes, reduces the display brightness difference of the display panel at different driving frequencies, and improves the display effect.

[0040] On the basis of the above embodiment, the driving transistor includes a P-type transistor, and at this time V ref3 <V ref2 <V ref1 <0; or, the driving transistor includes an N-type transistor, and at this time V ref3 >V ref2 >V ref1 >0.

[0041] Exemplarily, if the driving transistor includes a P-type transistor and the enable signal for controlling the conduction of the driving transistor is a low-level signal, at this time set V ref3 <Vref2 <V ref1 <0, that is, the smaller the driving frequency, the smaller the initialization signal. In the data writing stage, the data signal needs to rise from a lower potential. After the data writing stage ends, the gate potential of the driving transistor is smaller. In the light emitting stage, the source-gate voltage difference of the driving transistor is larger, the driving current is larger, and the light emitting brightness of the display panel is larger. In this way, the display panel is adjusted by dynamically adjusting the initialization signal at different driving frequencies, reducing or eliminating the display brightness difference when the display panel switches between different driving frequencies, and improving the display effect.

[0042] Similarly, if the driving transistor includes an N-type transistor and the enable signal for controlling the conduction of the driving transistor is a high-level signal, at this time, set V ref3 > V ref2 > V ref1 > 0, that is, the smaller the driving frequency, the larger the initialization signal. In the data writing stage, the data signal needs to rise from a higher potential. After the data writing stage ends, the gate potential of the driving transistor is larger. In the light emitting stage, the gate-source voltage difference of the driving transistor is larger, the driving current is larger, and the light emitting brightness of the display panel is larger. In this way, the display panel is adjusted by dynamically adjusting the initialization signal at different driving frequencies, reducing or eliminating the display brightness difference when the display panel switches between different driving frequencies, and improving the display effect.

[0043] Optionally,

[0044] As can be known from the above description, the initialization signal affects the initialization degree of the driving transistor, thereby affecting the data signal written into the gate of the driving transistor, and further affecting the driving current generated by the driving transistor in the light emitting stage to affect the light emitting brightness of the light emitting element. That is to say, the initialization signal is an indirect influencing factor of the light emitting brightness. Therefore, set the change degree of the initialization signal to be greater than the change degree of the driving frequency, that is In this way, it is ensured that the adjustment of the initialization signal to the display brightness can match the change degree of the driving frequency, that is, it can better adjust the light emitting brightness of the display panel at different driving frequencies to reduce or eliminate the display brightness difference when the display panel switches between different driving frequencies, and improve the display effect.

[0045] Optionally, |V ref2 - V ref3 | > |V ref1 - V ref2 |.

[0046] Specifically, the smaller the driving frequency of the display panel, the larger the time interval between two adjacent frames of display signals, that is, the longer the duration of the light-emitting holding stage. However, during the light-emitting holding stage, it is necessary to store the charge in the storage capacitor to maintain the gate potential of the driving transistor, and the amount of charge stored in the storage capacitor is continuously lost. Therefore, the smaller the driving frequency of the display panel, the greater the attenuation of the display brightness. This conclusion can also be obtained from the Figure 1 variation curves of the display brightness of the display panel over time when the driving frequencies are 120HZ and 40HZ as shown. Based on this, set |V ref2 -V ref3 | > |V ref1 -V ref2 |, that is, the smaller the driving frequency of the display panel, the greater the change trend of the initialization signal increases. In this way, the change trend of the initialization signal matches the change trend of the driving frequency and display brightness in the display panel, ensuring that the difference in display brightness at different driving frequencies can be compensated by adjusting the magnitude of the initialization signal, so as to reduce or eliminate the difference in display brightness when the display panel switches between different driving frequencies and improve the display effect.

[0047] Optionally, Figure 6 is another schematic diagram of the driving timing of the pixel circuit provided by the embodiment of the present invention, Figure 7 is a corresponding schematic diagram of the initialization signal and the display brightness provided by the embodiment of the present invention, Figure 7 in which curve 5 represents the initialization signal corresponding to the driving frequency F i , curve 6 represents the initialization signal corresponding to the signal writing stage of the driving frequency F j , and curve 7 represents the initialization signal corresponding to the light-emitting holding stage of the driving frequency F j . As shown in Figure 6 and Figure 7 , the driving mode of the display panel includes the i-th driving mode and the j-th driving mode. The j-th driving mode includes a signal writing stage and a light-emitting holding stage; where both i and j are integers and i≠j; the i-th driving mode corresponds to the i-th driving frequency F i and the i-th initialization signal V refi , the j-th driving mode corresponds to the j-th driving frequency F j , and the signal writing stage in the j-th driving mode corresponds to the j1 initialization signal V refj1 , and the light-emitting holding stage in the j-th driving mode corresponds to the j2 initialization signal V refj2 ; where, F j < F i , |V refj2 | > |V refj1 | > |V refi |.

[0048] Specifically, if the driving transistor includes a P-type transistor, when the j-th driving mode corresponding to the j-th driving frequency is less than the i-th driving mode corresponding to the i-th driving frequency, i.e., F j <F i at this time, the initialization signal in the j-th driving mode is controlled to be less than the initialization signal corresponding to the i-th driving mode, i.e., V refj (V refj1 、V refj2 )<V refi <0, as shown in Figure 6 and Figure 7 , at this time, it can be ensured that the brightness difference between the j-th driving mode and the i-th driving mode is small. Similarly, if the driving transistor includes an N-type transistor, when the j-th driving mode corresponding to the j-th driving frequency is less than the i-th driving mode corresponding to the i-th driving frequency, i.e., F j <F i at this time, the initialization signal in the j-th driving mode is controlled to be greater than the initialization signal corresponding to the i-th driving mode, i.e., V refj (V refj1 、V refj2 )>V refi >0 (not shown in the figure), at this time, it can be ensured that the brightness difference between the j-th driving mode and the i-th driving mode is small.

[0049] Furthermore, different from the driving mode with a larger driving frequency, the driving mode with a smaller driving frequency includes a signal writing stage and a light emission maintaining stage. During the light emission maintaining stage, since no signal is written and the electric charge stored in the storage capacitor is continuously lost, generally, the display brightness in the light emission stage is less than the light emission brightness in the signal writing stage. Based on this, in the embodiments of the present invention, it is creatively set that, in the driving mode with a smaller driving frequency, the absolute value of the initialization signal corresponding to the light emission maintaining stage is larger, that is, the i-th initialization signal V ref i corresponding to the i-th driving mode, the j1-th initialization signal V ref j1 corresponding to the signal writing stage in the j-th driving mode, and the j2-th initialization signal V ref j2 corresponding to the light emission maintaining stage in the j-th driving mode satisfy |V refj2 |>|V ref j1 |>|V ref i |, as shown in Figure 6 and Figure 7 , that is, by setting different initialization signals in different stages of the driving mode with a smaller driving frequency and different initialization signals at different driving frequencies to adjust the display brightness, reducing or eliminating the display brightness difference when switching between different driving frequencies of the display panel, and improving the display effect.

[0050] It should be noted that Figure 6 taking the larger driving frequency as twice the smaller driving frequency, and taking the initialization signal V refTaking <0 as an example for illustration, it can be understood that the embodiments of the present invention do not limit the specific values and specific magnification relationships between the larger driving frequency and the smaller driving frequency, nor do they limit whether the initialization signal is a positive signal or a negative signal. The positive and negative of the initialization signal are different from the types of driving transistors, which will not be elaborated here.

[0051] Optionally, the driving modes of the display panel include the k-th driving mode and the l-th driving mode, where the k-th driving mode is the main frequency driving mode; the k-th driving mode corresponds to the k-th driving frequency F k and the k-th initialization signal V ref k , the l-th driving mode corresponds to the l-th driving frequency F l and the l-th initialization signal V ref l ; where, F l <F k , and F k is an integer multiple of F l ;

[0052] Exemplarily, the k-th driving mode is the main frequency driving mode. The main frequency driving mode here can be understood as the driving mode that matches the working frequency of the driving chip in the display panel; or, the main frequency driving mode here can also be understood as the driving frequency corresponding to the display panel during normal display, and other driving modes are the frequency reduction driving modes obtained based on the normal driving mode according to the display requirements (such as reducing power consumption); or, the main frequency driving mode here can also be understood as the driving mode corresponding to the maximum driving frequency, that is, the k-th driving frequency F k is the maximum driving frequency of the display panel, and other driving modes are the frequency reduction driving modes obtained based on the main frequency driving mode according to the display requirements (such as reducing power consumption), that is, the driving frequency F l of the l-th driving frequency is the frequency reduction driving frequency based on the maximum driving frequency F k . Specifically, it is set that the driving frequency and initialization signal corresponding to the main frequency driving mode and the driving frequency and initialization signal corresponding to the frequency reduction driving mode satisfy That is, by reasonably setting the corresponding relationship between the driving frequency and the initialization signal, it is ensured that the initialization signal is adjusted according to the above corresponding relationship at different driving frequencies, so as to ensure that the display brightness difference at different driving frequencies of the display panel is reduced or eliminated, and the display effect is improved. For example, when F k =120HZ, F l =60HZ, |Vref k -Vref l | = 0.1V; when F k =120HZ, F l =40HZ, |V refk -V refl| = 0.2V; When F k = 120HZ, F l = 30HZ, |V refk -V refl | = 0.3V. After verification, when the driving frequency and initialization signal corresponding to the main frequency driving mode and the driving frequency and initialization signal corresponding to the frequency-down driving mode satisfy , the difference in display brightness between different driving frequencies is within 1%, ensuring that the difference in display brightness of the display panel at different driving frequencies is reduced or eliminated, and the display effect is improved.

[0053] Optionally, the driving mode of the display panel includes the s-th driving mode and the w-th driving mode, where the w-th driving mode is the highest-frequency driving mode; the s-th driving mode corresponds to the s-th driving frequency F s and the s-th initialization signal V refs , and the w-th driving mode corresponds to the w-th driving frequency F w and the w-th initialization signal V refw ; where

[0054] Exemplarily, the w-th driving mode is the highest-frequency driving mode. Here, the highest-frequency driving mode can be understood as the driving mode corresponding to the fastest refresh frequency of the display panel, and other driving modes are frequency-down driving modes obtained based on the highest-frequency driving mode according to display requirements (such as reducing power consumption), that is, the driving frequency F s of the s-th driving frequency is the frequency-down driving frequency based on the highest driving frequency F w . Specifically, set the driving frequency and initialization signal corresponding to the highest-frequency driving mode and the driving frequency and initialization signal corresponding to the frequency-down driving mode to satisfy , that is, by reasonably setting the corresponding relationship between the driving frequency and the initialization signal, ensure that the initialization signal is adjusted according to the above corresponding relationship at different driving frequencies, ensure that the difference in display brightness of the display panel at different driving frequencies is reduced or eliminated, and improve the display effect. For example, when F w = 120HZ, F s = 60HZ, When F w = 120HZ, F s = 40HZ, When F w = 120HZ, F s = 30HZ, 0.1V ≤ |V refs -V refw | ≤ 0.3V. After verification, when the driving frequency and initialization signal corresponding to the highest-frequency driving mode and the driving frequency and initialization signal corresponding to the frequency-down driving mode satisfy When the difference in display brightness between different driving frequencies is within 1%, it is ensured that the difference in display brightness of the display panel at different driving frequencies is reduced or eliminated, improving the display effect.

[0055] Based on the above embodiments, Figure 8 is a schematic diagram of the driving timing of another pixel circuit provided by an embodiment of the present invention. Combining Figure 3 and Figure 8 as shown, the display panel provided by the embodiment of the present invention may further include a power supply signal line 14, which is electrically connected to the power supply signal terminal PVDD and is used to transmit a power supply signal to the power supply signal terminal PVDD; the first driving mode also corresponds to a first power supply signal V dd1 , the second driving mode also corresponds to a second power supply signal V dd2 , and the third driving mode also corresponds to a third power supply signal V dd3 ; where

[0056] Specifically, it can be known from the working process of the foregoing pixel circuit that when the first power supply signal is different, the potential written on the source level of the driving transistor M3 is different. Thus, the gate-source voltage difference of the driving transistor is different during the light-emitting stage, the driving current generated by the driving transistor M3 is different, and the light-emitting brightness of the light-emitting element 11 is controlled differently. And because the decrease amplitude of the display brightness of the display panel at different driving frequencies is inconsistent, the display brightness of the display panel at different driving frequencies is different. And combining Figure 1 it can be known that the greater the driving frequency, the greater the display brightness of the display panel, and the smaller the driving frequency, the smaller the display brightness of the display panel. Thus, combining the influence of the above first power supply signal on the light-emitting brightness, it is possible to adjust the difference in display brightness at different driving frequencies by setting the first power supply signal differently at different driving frequencies. That is, different from the prior art where the first power supply signal is the same at different driving frequencies, the embodiment of the present invention creatively sets a first power supply signal that is dynamically adjusted at different driving frequencies, adjusts the display brightness at different driving frequencies through the dynamically adjusted first power supply signal, reduces the difference in display brightness of the display panel at different driving frequencies, and improves the display effect.

[0057] Specifically, the driving mode of the display panel 10 at least includes a first driving mode, a second driving mode, and a third driving mode. The first driving mode corresponds to a first driving frequency F1 and a first power supply signal V dd1 , the second driving mode corresponds to a second driving frequency F2 and a second power supply signal V dd2 , and the third driving mode corresponds to a third driving frequency F3 and a third power supply signal V dd3 ; where V dd1 ≠V dd2 ≠Vdd3 , that is, the first power supply signals corresponding to different driving frequencies are different. In this way, the display brightness at different driving frequencies is adjusted by the dynamically changing first power supply signal, reducing the display brightness difference at different driving frequencies of the display panel and improving the display effect. Further, that is, the degree of change of the first power supply signal is different from the degree of change of the driving frequency. In this way, the display brightness at different driving frequencies is further adjusted by the dynamically changing first power supply signal, reducing the display brightness difference at different driving frequencies of the display panel and improving the display effect.

[0058] Based on the above embodiments, the driving transistor includes a P-type transistor, V dd3 >V dd2 >V dd1 >0; alternatively, the driving transistor includes an N-type transistor, 0<V dd3 <V dd2 <V dd1 .

[0059] Exemplarily, if the driving transistor includes a P-type transistor, the driving current generated by the driving transistor is positively correlated with the voltage difference between the source and the gate of the driving transistor. At this time, set V dd3 >V dd2 >V dd1 >0, that is, the smaller the driving frequency, the larger the first power supply signal. During the light-emitting stage, the source potential of the driving transistor is larger, the source-gate voltage difference of the driving transistor is larger, the driving current is larger, and the light-emitting brightness of the display panel is larger. In this way, the adjustment of the display panel is realized by dynamically adjusting the first power supply signal at different driving frequencies, reducing or eliminating the display brightness difference when the display panel switches between different driving frequencies and improving the display effect.

[0060] Similarly, if the driving transistor includes an N-type transistor, the driving current generated by the driving transistor is positively correlated with the voltage difference between the gate and the source of the driving transistor. At this time, set 0<V dd3 <V dd2 <V dd1 , that is, the smaller the driving frequency, the smaller the first power supply signal. During the light-emitting stage, the source potential of the driving transistor is smaller, the gate-source voltage difference of the driving transistor is larger, the driving current is larger, and the light-emitting brightness of the display panel is larger. In this way, the adjustment of the display panel is realized by dynamically adjusting the first power supply signal at different driving frequencies, reducing or eliminating the display brightness difference when the display panel switches between different driving frequencies and improving the display effect.

[0061] Optionally,

[0062] As can be seen from the above description, the first power supply signal affects the gate-source voltage difference of the driving transistor, and further affects the driving current generated by the driving transistor during the light-emitting stage to affect the light-emitting brightness of the light-emitting element. That is to say, the first power supply signal is an indirect influencing factor for the light-emitting brightness. Therefore, the degree of change of the first power supply signal is set to be greater than the degree of change of the driving frequency, that is This ensures that the adjustment of the first power supply signal to the display brightness can match the degree of change of the driving frequency, that is, it can better adjust the light-emitting brightness of the display panel at different driving frequencies, so as to reduce or eliminate the display brightness difference when the display panel switches between different driving frequencies and improve the display effect.

[0063] Optionally, |V dd2 -V dd3 | > |V dd1 -V dd2 |.

[0064] Specifically, the smaller the driving frequency of the display panel, the larger the time interval between two adjacent frames of display signals, that is, the longer the duration of the light-emitting holding stage. However, during the light-emitting holding stage, the charge stored in the storage capacitor needs to maintain the gate potential of the driving transistor, and the amount of charge stored in the storage capacitor is continuously lost. Therefore, the smaller the driving frequency of the display panel, the greater the attenuation of the display brightness. This conclusion can also be obtained from the Figure 1 shown change curve of the display brightness of the display panel over time when the driving frequencies are 120HZ and 40HZ. Based on this, set |V dd2 -V dd3 | > |V dd1 -V dd2 |, that is, the smaller the driving frequency of the display panel, the greater the change trend of the first power supply signal. In this way, the change trend of the first power supply signal matches the change trend of the driving frequency and display brightness in the display panel, ensuring that the difference in display brightness at different driving frequencies can be compensated by adjusting the magnitude of the first power supply signal, so as to reduce or eliminate the display brightness difference when the display panel switches between different driving frequencies and improve the display effect.

[0065] Optionally, Figure 9 is another schematic diagram of the driving timing of the pixel circuit provided by the embodiment of the present invention. As Figure 9 shown, the driving mode of the display panel includes the m-th driving mode and the n-th driving mode. The n-th driving mode includes a signal writing stage and a light-emitting holding stage; where m and n are both integers and m ≠ n; the m-th driving mode corresponds to the m-th driving frequency F m and the m-th power supply signal V ddm , the n-th driving mode corresponds to the n-th driving frequency F n , and the signal writing stage in the n-th driving mode corresponds to the n1 initialization signal V ddn1, the light emission holding stage in the n-th driving mode corresponds to the n2 initialization signal V ddn2 ; F n <F m ; The driving transistor includes a P-type transistor, V ddn2 >V ddn1 >V ddm >0; Alternatively, the driving transistor includes an N-type transistor, 0 < V ddn2 <V ddn1 <V ddm .

[0066] Specifically, if the driving transistor includes a P-type transistor, when the n-th driving mode corresponds to an n-th driving frequency less than the m-th driving frequency corresponding to the m-th driving mode, i.e., F n <F m At this time, control the first power supply signal in the n-th driving mode to be greater than the first power supply signal corresponding to the m-th driving mode, i.e., V ddn >V ddm >0, such as Figure 9 , at this time, it can be ensured that the brightness difference between the n-th driving mode and the m-th driving mode is small. Similarly, if the driving transistor includes an N-type transistor, when the n-th driving mode corresponds to an n-th driving frequency less than the m-th driving frequency corresponding to the m-th driving mode, i.e., F n <F m At this time, control the first power supply signal in the n-th driving mode to be less than the first power supply signal corresponding to the m-th driving mode, i.e., 0 < V ddn <V ddm (not shown in the figure), at this time, it can be ensured that the brightness difference between the n-th driving mode and the m-th driving mode is small.

[0067] Furthermore, different from the driving mode with a larger driving frequency, the driving mode with a smaller driving frequency includes a signal writing stage and a light emission holding stage. In the light emission holding stage, since no signal is written and the charge stored in the storage capacitor is continuously lost, generally, the display brightness in the light emission stage is less than the light emission brightness in the signal writing stage. Based on this, in the embodiment of the present invention, it is creatively set that in the driving mode with a smaller driving frequency, if the driving transistor is a P-type transistor, the first power supply signal corresponding to the light emission holding stage is larger, that is, the m1 first power supply signal V corresponding to the m-th driving mode ddm , the n1 first power supply signal V corresponding to the signal writing stage in the n-th driving mode ddn1 and the n2 first power supply signal V corresponding to the light emission holding stage in the n-th driving mode ddn2 satisfy |V ddn2 >V ddn1 >V ddm >0, such as Figure 9As shown, the emission brightness is adjusted by adjusting the source-gate voltage difference of the driving transistor; or, if the driving transistor is an N-type transistor, the first power signal corresponding to the light-emission holding stage is small, that is, the m-th first power signal V ddm corresponding to the m-th driving mode, the n1-th first power signal V ddn1 corresponding to the signal writing stage in the n-th driving mode, and the n2-th first power signal V ddn2 corresponding to the light-emission holding stage in the n-th driving mode satisfy 0 < V ddn2 < V ddn1 < V ddm . Thus, the emission brightness is adjusted by adjusting the gate-source voltage difference of the driving transistor. Generally speaking, for two driving modes with different driving frequencies, the first power signals in different stages of the driving mode with a smaller driving frequency are set to be different, and the first power signals at different driving frequencies are different to adjust the display brightness, reducing or eliminating the display brightness difference when the display panel switches between different driving frequencies and improving the display effect.

[0068] It should be noted that Figure 9 taking the larger driving frequency as twice the smaller driving frequency as an example for illustration, it can be understood that the specific values and specific multiple relationships between the larger driving frequency and the smaller driving frequency in the embodiments of the present invention are not limited.

[0069] Based on the above embodiments,

[0070] Specifically, the initialization signal affects the initialization degree of the driving transistor, thereby affecting the data signal written into the gate of the driving transistor, further affecting the gate-source voltage difference of the driving transistor, and finally affecting the driving current generated by the driving transistor in the light-emission stage to affect the emission brightness of the light-emitting element. The first power signal affects the gate-source voltage difference of the driving transistor, and further affects the driving current generated by the driving transistor in the light-emission stage to affect the emission brightness of the light-emitting element. In summary, the first power signal has a more direct influence on the emission brightness of the light-emitting element, and the initialization signal has a more indirect influence on the emission brightness of the light-emitting element compared with the first power signal. Therefore, in adjusting the emission brightness, the change degree of the initialization signal can be set to be greater than the change degree of the first power signal, that is In this way, by reasonably dynamically adjusting the initialization signal and the first power signal, the display brightness difference when the display panel switches between different driving frequencies is reduced or eliminated, and the display effect is improved.

[0071] Based on the above embodiments, |V dd1 - |V ref1 || > |V dd2 - |V ref2 || > |V dd3-|V ref3 ||。

[0072] As described above, the first power supply signal has a more direct influence on the emission brightness of the light-emitting element, and the initialization signal has a more indirect influence on the emission brightness of the light-emitting element compared with the first power supply signal. Therefore, in order to ensure the adjustment of the display brightness at different driving frequencies, the degree of change of the first power supply signal can be set to be less than the degree of change of the initialization signal. That is to say, as the driving frequency decreases, the difference between the absolute values of the first power supply signal and the initialization signal gradually decreases, i.e., |V dd1 -|V ref1 ||>|V dd2 -|V ref2 ||>|V dd3 -|V ref3 ||. In this way, by reasonably dynamically adjusting the initialization signal and the first power supply signal, the display brightness difference when the display panel switches between different driving frequencies can be reduced or eliminated, improving the display effect.

[0073] Based on the above embodiments, the driving modes of the display panel include the p-th driving mode and the q-th driving mode, where the q-th driving mode is the main frequency driving mode; where p and q are both integers and p≠q; the p-th driving mode corresponds to the p-th driving frequency F p 、the p-th initialization signal V refp and the p-th power supply signal V ddp , the q-th driving mode corresponds to the q-th driving frequency F q 、the q-th initialization signal V refq and the q-th power supply signal V ddq ; the driving transistor includes a P-type transistor, Alternatively, the driving transistor includes an N-type transistor, wherein, and F q is an integer multiple of F p .

[0074] Exemplarily, the q-th driving mode is the main frequency driving mode. Here, the main frequency driving mode can be understood as the driving mode that matches the operating frequency of the driving chip in the display panel; or, here, the main frequency driving mode can also be understood as the driving frequency corresponding to the display panel during normal display, and other driving modes are down-frequency driving modes obtained based on the normal driving mode according to display requirements (such as reducing power consumption); or, here, the main frequency driving mode can also be understood as the driving mode corresponding to the maximum driving frequency, that is, the q-th driving frequency F q is the maximum driving frequency of the display panel, and other driving modes are down-frequency driving modes obtained based on the main frequency driving mode according to display requirements (such as reducing power consumption), that is, the driving frequency F p of the p-th driving frequency is at the maximum driving frequency Fq The frequency of the reduced-frequency driving is based on this. Specifically, when the driving transistor is a P-type transistor, at this time, the potential of the first power signal is greater than the potential of the initialization signal. It can be set that the driving frequency, the initialization signal, and the first power signal corresponding to the main-frequency driving mode, as well as the driving frequency, the initialization signal, and the first power signal corresponding to the reduced-frequency driving mode, satisfy When the driving transistor is an N-type transistor, the potential of the first initialization signal is greater than the potential of the first power signal. It can be set that the driving frequency, the initialization signal, and the first power signal corresponding to the main-frequency driving mode, as well as the driving frequency, the initialization signal, and the first power signal corresponding to the reduced-frequency driving mode, satisfy That is, by reasonably setting the corresponding relationship between the driving frequency and the initialization signal, it is ensured that the initialization signal and the first power signal are adjusted according to the above corresponding relationship at different driving frequencies, so as to ensure that the display brightness difference at different driving frequencies of the display panel can be reduced or eliminated, and the display effect is improved. For example, when F q = 120HZ, F p = 60HZ, (V ddp - V refp ) = (V ddq - V refq ) + 0.1V, or, (V refp - V ddp ) = (V refq - V ddq ) + 0.1V; F q = 120HZ, F p = 40HZ, (V ddp - V refp ) = (V ddq - V refq ) + 0.2V, or, (V refp - V ddp ) = (V refq - V ddq ) + 0.2V; F q = 120HZ, F p = 30HZ, (V ddp - V refp ) = (V ddq - V refq ) + 0.3V, or, (V refp - V ddp ) = (V refq - V ddq) + 0.1V. After verification, when the driving frequencies, initialization signals, and first power supply signals corresponding to the main frequency driving mode and the driving frequencies, initialization signals, and first power supply signals corresponding to the downscaling driving mode meet the above limitations, the difference in display brightness between different driving frequencies is within 1%, ensuring that the difference in display brightness of the display panel at different driving frequencies is reduced or eliminated, and the display effect is improved.

[0075] Optionally, continue to refer to Figure 3 As shown, the pixel circuit 12 provided in the embodiment of the present invention further includes a reset transistor M7 and a reset signal terminal VREF2; the reset signal terminal VREF2 is electrically connected to the initialization signal line 13 and the first end of the reset transistor M7 respectively, and the second end of the reset transistor M7 is electrically connected to the first end of the light-emitting element 11; the initialization signal line 113 is used to provide signals to the initialization signal terminal VREF1 and the reset signal terminal VREF2 in a time-sharing manner, and the signals received by the reset signal terminal VREF2 are the same under different driving modes.

[0076] Specifically, the pixel circuit 12 provided in the embodiment of the present invention may further include a reset transistor M7, and the reset transistor M7 is used to provide a reset signal to the first pole (for example, the first pole) of the light-emitting element 11, which can reduce the influence of the voltage of the first pole of the light-emitting element 11 in the previous frame on the voltage of the first pole of the light-emitting element 11 in the next frame. Optionally, the reset signal terminal VREF2 and the initialization signal terminal VREF1 are the same signal terminal and are electrically connected to the same initialization signal line 13. Since the potential of the reset signal transmitted by the reset signal terminal VREF2 is different from the potential of the initialization signal transmitted by the initialization signal terminal VREF1, the initialization signal line 13 can provide different initialization signals / reset signals to the initialization transistor M5 and the reset transistor M7 in a time-sharing manner by combining the enable signals of the control terminals of the initialization transistor M5 and the reset transistor M7, and initialize / reset the gate of the driving transistor M5 and the first pole of the light-emitting element 11 in a time-sharing manner. Further, although the initialization signals received by the initialization signal terminal VREF1 are different under different driving modes, and the light-emitting brightness at different driving frequencies is adjusted through the initialization signals, the signals received by the reset signal terminal VREF2 are the same under different driving modes. That is to say, the change in the driving frequency does not affect the reset received by the reset signal terminal VREF2, or in other words, the change in the initialization signal does not affect the reset received by the reset signal terminal VREF2, ensuring that the reset signals received by the first pole of the light-emitting element 11 are the same at different driving frequencies, and the first pole of the light-emitting element has the same reset effect and the same light-emitting effect.

[0077] It should be noted that Figure 3For example, only the initialization transistor M5 and the reset transistor M7 are connected to the same initialization signal terminal. At this time, the initialization signal terminal can provide different initialization signals (reset signals) at different times. Optionally, the initialization transistor M5 and the reset transistor M7 can be connected to different initialization signal terminals (not shown in the figure). The different initialization signal terminals respectively provide corresponding initialization signals and reset signals to implement the initialization of the driving transistor M3 and the reset of the first pole of the light-emitting element 11. At this time, the change in the driving frequency will not affect the reset received by the reset signal terminal. Or rather, the change in the initialization signal will not affect the reset received by the reset signal terminal, ensuring that the reset signals received by the first pole of the light-emitting element are the same at different driving frequencies, and the first pole of the light-emitting element has the same reset effect.

[0078] Based on the same inventive concept, an embodiment of the present invention further provides a driving method for a display panel, which is used to drive the display panel described in any of the above embodiments. Specifically, Figure 10 is a schematic flowchart of a driving method for a display panel provided by an embodiment of the present invention. As Figure 10 shown, the driving method for the display panel provided by the embodiment of the present invention includes:

[0079] S110. In the first driving mode, drive the pixel circuit with a first driving frequency and a first initialization signal.

[0080] S120. In the second driving mode, drive the pixel circuit with a second driving frequency and a second initialization signal.

[0081] S130. In the third driving mode, drive the pixel circuit with a third driving frequency and a third initialization signal.

[0082] Wherein, the first driving frequency F1, the first initialization signal V ref1 , the second driving frequency F2, the second initialization signal V ref2 , the third driving frequency F3 and the third initialization signal V ref3 satisfy: F1 > F2 > F3, and V ref1 ≠ V ref2 ≠ V ref3 ,

[0083] Specifically, the degrees of decrease in the display brightness of the display panel at different driving frequencies are inconsistent, resulting in different display brightnesses of the display panel at different driving frequencies. Moreover, due to different initialization signals, the initialization degrees of the driving transistors are different. Consequently, during the data signal writing stage, the data signals written into the gates of the driving transistors are different, leading to different gate-source voltage differences of the driving transistors during the light-emitting stage, different driving currents generated by the driving transistors, and different light-emitting brightnesses of the light-emitting elements. Therefore, different from the prior art solutions where the initialization signals are the same at different driving frequencies, the embodiments of the present invention creatively set the initialization signals that are dynamically adjusted at different driving frequencies, and adjust the display brightness at different driving frequencies through the dynamically adjusted initialization signals, reduce the difference in the display brightness of the display panel at different driving frequencies, and improve the display effect.

[0084] Specifically, in the first driving mode, the pixel circuit is driven with a first driving frequency and a first initialization signal; in the second driving mode, the pixel circuit is driven with a second driving frequency and a second initialization signal; in the third driving mode, the pixel circuit is driven with a third driving frequency and a third initialization signal. Among them, F1 > F2 > F3, V ref1 ≠V ref2 ≠V ref3 , that is, the initialization signals corresponding to different driving frequencies are different. In this way, the display brightness at different driving frequencies is adjusted through the dynamically changing initialization signals, the difference in the display brightness of the display panel at different driving frequencies is reduced, and the display effect is improved. On this basis, that is, the degree of change of the initialization signal is different from the degree of change of the driving frequency. In this way, the display brightness at different driving frequencies is further adjusted through the dynamically changing initialization signals, the difference in the display brightness of the display panel at different driving frequencies is reduced, and the display effect is improved.

[0085] In summary, the driving method provided by the embodiments of the present invention adjusts the difference in the display brightness in different driving modes by setting different initialization signals in different driving modes, and further adjusts the display brightness in different driving modes by setting that the degree of change of the driving frequency is different from the degree of change of the initialization signal in different driving modes, reduces the difference in the display brightness of the display panel at different driving frequencies, and improves the display effect.

[0086] Based on the above embodiments, Figure 11 is a schematic diagram of the driving timing of another pixel circuit provided by the embodiments of the present invention. As Figure 11 shown, the gate of the initialization transistor is electrically connected to the scanning signal input terminal; when switching between different driving modes, the initialization signal V input by the initialization signal terminal refThe switching moment is earlier than the switching moment of the scan signal Scan1 input at the scan signal input terminal; and the initialization signal V corresponding to the current driving mode ref The switching moment is within the enabling stage of the light emission control signal Emit corresponding to the previous driving mode.

[0087] Exemplarily, as Figure 11 shown, when switching between different driving modes, the switching moment of the initialization signal V input at the initialization signal input terminal ref is earlier than the switching moment of the scan signal Scan1 input at the scan signal input terminal. In this way, it can be ensured that during the entire enabling stage of the scan signal Scan1, a stable initialization signal V can be input to the gate of the driving transistor ref , rather than a suddenly changing initialization signal V ref , to ensure the stability of the first-frame signal writing at different driving frequencies. Further, the switching moment of the initialization signal V corresponding to the current driving mode ref is within the enabling stage of the light emission control signal Emit corresponding to the previous driving mode. At this time, the display panel is still working in the light emission stage of the previous driving mode, and the change of the initialization signal V ref will not affect the normal display of the previous driving mode and ensure the normal operation of the display panel.

[0088] Based on the same inventive concept as above, an embodiment of the present invention further provides a display device. Figure 12 is a schematic structural diagram of a display device provided by an embodiment of the present invention. As Figure 12 shown, the display device 100 includes the display panel 10 in the above embodiment. The display device includes the display panel of any embodiment of the present invention. Therefore, the display device provided by the embodiment of the present invention has the corresponding beneficial effects of the display panel provided by the embodiment of the present invention, which will not be elaborated here. Exemplarily, the display device may be an electronic device such as a mobile phone, a computer, a smart wearable device (for example, a smart watch), and a vehicle-mounted display device, etc., and the embodiment of the present invention does not limit this.

[0089] Note that the above is only a preferred embodiment of the present invention and the applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and various obvious changes, re-adjustments, mutual combinations, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the inventive concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that, Comprising a light-emitting element and a pixel circuit electrically connected to the light-emitting element; The pixel circuit includes a driving transistor and an initialization transistor. A first end of the initialization transistor is electrically connected to an initialization signal terminal, a second end of the initialization transistor is electrically connected to a gate of the driving transistor, a first end of the driving transistor is electrically connected to a power supply signal terminal, and a second end of the driving transistor is electrically connected to a first end of the light-emitting element; The display panel further includes an initialization signal line electrically connected to the initialization signal terminal for transmitting an initialization signal to the initialization signal terminal; The driving modes of the display panel include at least a first driving mode, a second driving mode, and a third driving mode. The first driving mode corresponds to a first driving frequency F1 and a first initialization signal V ref1 , the second driving mode corresponds to a second driving frequency F2 and a second initialization signal V ref2 , and the third driving mode corresponds to a third driving frequency F3 and a third initialization signal V ref3 ; where F1 > F2 > F3, and V ref1 ≠ V ref2 ≠ V ref3 , and 2. The display panel according to claim 1, characterized in that, |V ref2 -V ref3 |>|V ref1 -V ref2 |。 3. The display panel according to claim 1, characterized in that, The driving mode of the display panel includes a first driving mode and a second driving mode, and the second driving mode includes a signal writing stage and a light-emitting holding stage; Wherein both i and j are integers and i≠j; The i-th driving mode corresponds to the i-th driving frequency F i and the i-th initialization signal V refi ; the j-th driving mode corresponds to the j-th driving frequency F j , and the signal writing stage in the j-th driving mode corresponds to the j1-th initialization signal V refj1 , and the light emission holding stage in the j-th driving mode corresponds to the j2-th initialization signal V refj2 ; Among them, F j <F i , |V refj2 | > |V refj1 | > |V refi |.

4. The display panel according to claim 1, characterized in that, The driving transistor includes a P-type transistor, V ref3 <V ref2 <V ref1 <0; Alternatively, the driving transistor includes an N-type transistor, V ref3 >V ref2 >V ref1 >0.

5. The display panel according to claim 1, characterized in that, The driving mode of the display panel includes a third driving mode and a fourth driving mode, wherein the third driving mode is a main frequency driving mode; The k-th driving mode corresponds to the k-th driving frequency F k and the k-th initialization signal Vref k ; the l-th driving mode corresponds to the l-th driving frequency F l and the l-th initialization signal V refl ; Among them, F l <F k , and F k is an integer multiple of F l ; 6. The display panel according to claim 1, characterized in that, The driving mode of the display panel includes a fifth driving mode and a sixth driving mode, wherein the sixth driving mode is the highest frequency driving mode; The s-th driving mode corresponds to the s-th driving frequency F s and the s-th initialization signal V refs ; the w-th driving mode corresponds to the w-th driving frequency F w and the w-th initialization signal V refw ; Among them, 7. The display panel according to claim 1, characterized in that, The display panel further includes a power supply signal line electrically connected to the power supply signal terminal for transmitting a power supply signal to the power supply signal terminal; The first driving mode also corresponds to a first power supply signal V dd1 , the second driving mode also corresponds to a second power supply signal V dd2 , the third driving mode also corresponds to a third power supply signal V dd3 ; Among them, 8. The display panel according to claim 7, characterized in that, 9. The display panel according to claim 7, characterized in that, |V dd2 -V dd3 |>|V dd1 -V dd2 |。 10. The display panel according to claim 7, characterized in that, The driving mode of the display panel includes a seventh driving mode and an eighth driving mode, and the eighth driving mode includes a signal writing stage and a light-emitting holding stage; wherein both m and n are integers and m≠n; The m-th driving mode corresponds to the m-th driving frequency F m and the m-th power supply signal V ddm , the n-th driving mode corresponds to the n-th driving frequency F n , and the signal writing stage in the n-th driving mode corresponds to the n1-th initialization signal V ddn1 , the light emission holding stage in the n-th driving mode corresponds to the n2-th initialization signal V ddn2 ; F n <F m； The driving transistor includes a P-type transistor, V ddn2 >V ddn1 >V ddm >0; alternatively, the driving transistor includes an N-type transistor, 0 < V ddn2 <V ddn1 <V ddm .

11. The display panel according to claim 7, characterized in that, The driving transistor includes a P-type transistor, V dd3 >V dd2 >V dd1 > 0; Alternatively, the driving transistor includes an N-type transistor, 0 < V dd3 < V dd2 < V dd1 .

12. The display panel according to claim 7, wherein, 13. The display panel according to claim 7, wherein, |V dd1 -|V ref1 ||>|V dd2 -|V ref2 ||>|V dd3 -|V ref3 ||。 14. The display panel according to claim 7, wherein, The driving mode of the display panel includes a ninth driving mode and a tenth driving mode, wherein the tenth driving mode is a main frequency driving mode; wherein both p and q are integers and p≠q; The p-th driving mode corresponds to the p-th driving frequency F p , the p-th initialization signal V refp and the p-th power supply signal V ddp , and the q-th driving mode corresponds to the q-th driving frequency F q , the q-th initialization signal V refq and the q-th power supply signal V ddq ; The driving transistor includes a P-type transistor, Alternatively, the driving transistor includes an N-type transistor, wherein, and F q is F p an integer multiple of.

15. The display panel according to claim 1, wherein, The pixel circuit further includes a reset transistor and a reset signal terminal; The reset signal terminal is electrically connected to the initialization signal line and a first end of the reset transistor respectively, and a second end of the reset transistor is electrically connected to a first end of the light-emitting element; The initialization signal line is used to provide signals to the initialization signal terminal and the reset signal terminal in a time-sharing manner, and the signals received by the reset signal terminal are the same under different driving modes.

16. A driving method for a display panel, for driving the display panel according to any one of claims 1-15, wherein, The driving method includes: In a first driving mode, driving the pixel circuit with a first driving frequency and a first initialization signal; In a second driving mode, driving the pixel circuit with a second driving frequency and a second initialization signal; In a third driving mode, driving the pixel circuit with a third driving frequency and a third initialization signal; Among them, the first driving frequency F1, the first initialization signal V ref1 , the second driving frequency F2, the second initialization signal V ref2 , the third driving frequency F3, and the third initialization signal V ref3 satisfy: F1 > F2 > F3, and V ref1 ≠ V ref2 ≠ V ref3 , and 17. The driving method according to claim 16, wherein, A gate of the initialization transistor is electrically connected to a scanning signal input terminal; When switching between different driving modes, the switching moment of the initialization signal input to the initialization signal terminal is earlier than the switching moment of the scanning signal input to the scanning signal input terminal; and the switching moment of the initialization signal corresponding to the current driving mode is within the enabling stage of the light-emitting control signal corresponding to the previous driving mode.

18. A display device, wherein, Including the display panel according to any one of claims 1-15.

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