Display panel, driving method thereof and display device

Abstract

The invention discloses a display panel, a driving method thereof and a display device, a pixel circuit in the display panel comprises a driving transistor, an initialization transistor and an initialization signal line, and an initialization signal end is electrically connected with a first end of the initialization transistor and the initialization signal line. The first end of the driving transistor is electrically connected with a power signal end, the second end is electrically connected with the first end of the light-emitting element, and the gate is electrically connected with the second end of the initialization transistor; the driving modes of the display panel at least comprise 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 Vref1, the second driving mode corresponds to a second driving frequency F2 and a second initialization signal Vref2, and the third driving mode corresponds to a third driving frequency F3 and a third initialization signal Vref3; according to the invention, when the frequency is larger than F3, F1 > F2 > F3, Vref1 is not equal to Vref2 and Vref3 is not equal to Vref2, and # imgabs0 # imgabs1 # adopts dynamically changing initialization signals, so that the brightness difference between different frequencies can be reduced, and the display effect is improved.

Description

[0001] This application is a divisional application of the application with the application date of June 29, 2022, application number 202210760958.5, and invention title "A display panel, its driving method, and a display device". Technical Field

[0002] The present invention relates to the field of display technologies, and particularly to a display panel, its driving method, and a display device. Background Art

[0003] 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.

[0004] 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

[0005] Embodiments of the present invention provide a display panel, its driving method, 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.

[0006] In a first aspect, embodiments of the present invention provide a display panel, including a light-emitting element and a pixel circuit electrically connected to the light-emitting element;

[0007] The pixel circuit includes a driving transistor and an initialization transistor. The first end of the initialization transistor is electrically connected to an 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 a 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 modes of the display panel 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 ; where F1 > F2 > F3, and V ref1 ≠V ref2 ≠V ref3 ,

[0008] In a second aspect, an embodiment of the present invention further provides a driving method for a display panel, which is used to drive the display panel in the first direction. The driving method includes:

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

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

[0011] In a third driving mode, the pixel circuit is driven by a third driving frequency and a third initialization signal;

[0012] 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 ,

[0013] In a third aspect, an embodiment of the present invention further provides a display device, including the display panel described in the first aspect.

[0014] 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 ref1 in the first driving mode, the second driving frequency F2 and the second initialization signal V ref2 in the second driving mode, and the third driving frequency F3 and the third initialization signal V ref3 in the third driving mode satisfy 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 that the change degree of the driving frequency in different driving modes is different from the change degree of the initialization signal to further adjust the display brightness in different driving modes, reducing the display brightness difference of the display panel at different driving frequencies and improving the display effect. Description of the Drawings

[0015] Figure 1 is a schematic diagram of the change in display brightness at different driving frequencies in the prior art;

[0016] Figure 2It is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0017] Figure 3 It is a schematic circuit diagram of a pixel circuit provided by an embodiment of the present invention;

[0018] Figure 4 It is a schematic diagram of the driving timing of a pixel circuit provided by an embodiment of the present invention;

[0019] 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;

[0020] Figure 6 It is another schematic diagram of the driving timing of a pixel circuit provided by an embodiment of the present invention;

[0021] 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;

[0022] Figure 8 It is another schematic diagram of the driving timing of a pixel circuit provided by an embodiment of the present invention;

[0023] Figure 9 It is another schematic diagram of the driving timing of a pixel circuit provided by an embodiment of the present invention;

[0024] Figure 10 It is a schematic flowchart of a driving method for a pixel circuit provided by an embodiment of the present invention;

[0025] Figure 11 It is another schematic diagram of the driving timing of a pixel circuit provided by an embodiment of the present invention;

[0026] Figure 12 It is a schematic structural diagram of a display device provided by an embodiment of the present invention. Detailed implementation manners

[0027] 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 the description of the embodiments or the prior art. Obviously, the drawings in the following description are some specific embodiments of the present invention. For those skilled in the art, according to the basic concepts of the device structure, driving method, and manufacturing method disclosed and prompted by various embodiments of the present invention, they can be extended and extended to other structures and drawings. Undoubtedly, these should be within the scope of the claims of the present invention.

[0028] Figure 1 It is a schematic diagram of the change in display brightness at different driving frequencies in the prior art, as shown in Figure 1As 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 1 shown, as time changes, the luminous 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 120HZ to 60HZ, the luminous brightness of the display panel changes by 1%, when the driving frequency drops from 120HZ to 40HZ, the luminous brightness of the display panel changes by 2%, and when the driving frequency drops from 120HZ to 30HZ, the luminous 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.

[0029] It should be noted that the dotted part in curve 1 also represents the curve of the display brightness of the display panel changing with time when the driving frequency is 120HZ. Since it coincides with the curve of the display brightness of the display panel changing with time when the driving frequency is 40HZ, it is represented by a dotted line. Figure 1 The hatched part can represent the brightness difference between the display brightness of the display panel when the driving frequency is 120HZ and the display brightness of the display panel when the driving frequency is 40HZ.

[0030] 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 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 , 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 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 ref1The 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 different initialization signals in different driving modes to adjust the display brightness difference in different driving modes, and further by setting different degrees of change in the driving frequency and the initialization signal in different driving modes to further adjust the display brightness in different driving modes, reducing the display brightness difference at different driving frequencies of the display panel and improving the display effect.

[0031] 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 creative efforts belong to the scope of protection of the present invention.

[0032] 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. As shown in Figures 2 - 5 , 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 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 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; where F1 > F2 > F3, and V ref1 ≠V ref2 ≠V ref3 ,

[0033]

[0034] 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. The specific type of the light-emitting element 11 in the embodiments of the present invention is not limited.

[0035] Optionally, the pixel circuit 12 can include a plurality of 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 ref on the initialization signal line 13 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 refThe control drive transistor M3 is also turned on, and the data signal input at the data signal input terminal Vdata passes through the data signal writing transistor M2, the drive transistor M3, and the threshold compensation 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 gate voltage of the drive transistor M3 is raised to a voltage difference less than or equal to the threshold voltage V of the drive transistor M3 with respect to its source voltage, the drive transistor M3 will be in the cut-off state. At the same time, during the data signal voltage writing stage, the reset transistor M7 is also turned on, and the reset transistor M7 writes the initialization signal V on the initialization signal line 13 th to the first pole (for example, the first pole) of the light-emitting element 11, initializing 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 at the light-emitting control signal terminal Emit is an enable signal, and the signals input at 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 drive current generated by the drive transistor M3 drives the light-emitting element 11 to emit light. Based on the above description of the working process, it can be known that when the initialization signal V ref is different, the initialization degree of the drive transistor M3 is different. Thus, during the data signal writing stage, the data signals written into the gate of the drive transistor M3 are different. Furthermore, during the light-emitting stage, the gate-source voltage difference of the drive transistor is different, the drive current generated by the drive transistor M3 is different, and the light-emitting brightness of the light-emitting element 11 is controlled differently. ref It should be noted that

[0036] taking the transistors M1-M7 as P-type transistors as an example for illustration, correspondingly, the enable signals corresponding to the respective transistors are low-level signals. The transistors M1-M7 can also all be N-type transistors. At this time, the enable signals corresponding to the respective transistors are high-level signals. The embodiments of the present invention do not limit the types of the respective transistors. At the same time, 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 drive 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. Figure 3 As can be known from the above description, the decrease amplitudes of 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. And combined with

[0037] 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 above initialization signal V Figure 1 ​ref the influence on the emission brightness, so the initialization signal V can be set at different driving frequencies ref to be different to adjust the display brightness difference at different driving frequencies, that is, different from the prior art in which 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, and the display brightness at different driving frequencies is adjusted through the dynamically adjusted initialization signals, reducing the display brightness difference at different driving frequencies of the display panel and improving the display effect.

[0038] 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, reducing the display brightness difference at different driving frequencies of the display panel and improving the display effect. 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.

[0039] 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, reducing the display brightness difference at different driving frequencies of the display panel and improving the display effect.

[0040] Exemplarily, as Figure 4 and Figure 5 shown, Figure 4 corresponding to Figure 3 the case where each transistor is a P-type transistor, 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 120HZ, and curve 4 represents the curve of the display brightness of the display panel changing with time when the driving frequency is 40HZ. And the hatched part can represent the brightness difference between the display brightness of the display panel when the driving frequency is 120HZ and the display brightness of the display panel when the driving frequency is 40HZ. Specifically, Figure 5 The hatched part on the left side in the figure can be understood as the situation where the display brightness of the display panel when the driving frequency is 40HZ is greater than the display brightness of the display panel when the driving frequency is 120HZ, and the hatched part on the right side can be understood as the situation where the display brightness of the display panel when the driving frequency is 120HZ is greater than the display brightness of the display panel when the driving frequency is 40HZ. Therefore, by setting the initialization signals corresponding to different driving frequencies to be different, and the change degree of the initialization signal to be different from the change degree of the driving frequency, the display brightness difference under different driving modes can be neutralized, the display brightness difference of the display panel under different driving frequencies can be reduced or eliminated, and the display effect can be improved. For example, by setting the initialization signals corresponding to different driving frequencies to be different, and the change degree of the initialization signal to be different from the change degree of the driving frequency, when the driving frequency drops from 120HZ to 60HZ, the luminous brightness of the display panel changes by 0.5%, when the driving frequency drops from 120HZ to 40HZ, the luminous brightness of the display panel changes by 0.5%, and when the driving frequency drops from 120HZ to 30HZ, the luminous brightness of the display panel changes by 0.5%. The change in the display brightness caused by the change in the driving frequency under the condition of dynamic adjustment of the initialization signal is much smaller than the change in the display brightness caused by the change in the driving frequency under the condition that the initialization signal remains unchanged in the prior art.

[0041] In summary, the display panel provided by the embodiment of the present invention adjusts the display brightness difference under different driving modes by setting different initialization signals under different driving modes, and further adjusts the display brightness under different driving modes by setting the change degree of the driving frequency and the change degree of the initialization signal under different driving modes to be different, reduces the display brightness difference of the display panel under different driving frequencies, and improves the display effect.

[0042] Based on the above embodiment, the driving transistor includes a P-type transistor. At this time, V ref3 <V ref2 <V ref1 <0; or, the driving transistor includes an N-type transistor. At this time, V ref3 >V ref2 >V ref1 >0.

[0043] Exemplarily, if the driving transistor includes a P-type transistor, 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, by dynamically adjusting the initialization signal at different driving frequencies, the adjustment of the display panel is realized, reducing or eliminating the display brightness difference when the driving frequency of the display panel is switched, and improving the display effect.

[0044] 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, by dynamically adjusting the initialization signal at different driving frequencies, the adjustment of the display panel is realized, reducing or eliminating the display brightness difference when the driving frequency of the display panel is switched, and improving the display effect.

[0045] Optionally,

[0046] As can be seen 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, the light emitting brightness of the display panel at different driving frequencies can be better adjusted to reduce or eliminate the display brightness difference when the driving frequency of the display panel is switched, and improve the display effect.

[0047] Optionally, |V ref2 - V ref3 | > |V ref1 - V ref2 |.

[0048] 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 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 display brightness difference when the display panel switches between different driving frequencies and improve the display effect.

[0049] 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 ; 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 ref i , 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 ref j1 , the light-emitting holding stage in the j-th driving mode corresponds to the j2-th initialization signal V ref j2 ; where, F j < F i , |V ref j2 | > |V ref j1|>|V ref i |。

[0050] 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 ref j (V ref j1 、V ref j2 )<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 ref j (V ref j1 、V ref j2 )>V ref i >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.

[0051] 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 leaking, generally, the display brightness in the light emission stage is less than the light emission brightness in the signal writing stage. Based on this, the embodiment of the present invention creatively sets that the absolute value of the initialization signal corresponding to the light emission holding stage in the driving mode with a smaller driving frequency 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 holding stage in the j-th driving mode satisfy |V refj2 |>|V ref j1 |>|V refi |, such as Figure 6 and Figure 7 shown, 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 the display panel switches between different driving frequencies, and improving the display effect.

[0052] It should be noted that Figure 6 taking the larger driving frequency as twice the smaller driving frequency, and taking the initialization signal V ref <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 multiple relationships between the larger driving frequency and the smaller driving frequency, and do not 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.

[0053] Optionally, the driving mode of the display panel includes 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 ;

[0054] Exemplarily, the k-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 working 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 k-th driving frequency F k 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 l of the l-th driving frequency is the down-frequency driving frequency based on the maximum driving frequency F k Specifically, setting the driving frequency and initialization signal corresponding to the main frequency driving mode and the driving frequency and initialization signal corresponding to the down-frequency driving mode to satisfy That is, by reasonably setting the correspondence between the driving frequency and the initialization signal, it is ensured that the initialization signal is adjusted according to the above correspondence at different driving frequencies, so as to reduce or eliminate the display brightness difference of the display panel at different driving frequencies and improve the display effect. For example, when F k = 120HZ and F l = 60HZ, |Vref k - Vref l | = 0.1V; when F k = 120HZ and F l = 40HZ, |V refk - V refl | = 0.2V; when F k = 120HZ and F l = 30HZ, |V ref k - V ref l | = 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 reduction driving mode satisfy , the display brightness difference between different driving frequencies is within 1%, ensuring that the display brightness difference of the display panel at different driving frequencies is reduced or eliminated and the display effect is improved.

[0055] 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 ref s , and the w-th driving mode corresponds to the w-th driving frequency F w and the w-th initialization signal V ref w ; among them,

[0056] 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 reduction 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 reduction driving frequency based on the highest driving frequency F w . Specifically, it is set that the driving frequency and initialization signal corresponding to the highest frequency driving mode and the driving frequency and initialization signal corresponding to the frequency reduction driving mode satisfy That is, by reasonably setting the correspondence between the driving frequency and the initialization signal, it is ensured that the initialization signal is adjusted according to the above correspondence at different driving frequencies, so as to reduce or eliminate the display brightness difference of the display panel at different driving frequencies 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 reduction driving mode satisfy When, the display brightness difference between different driving frequencies is within 1%, which ensures that the display brightness difference of the display panel at different driving frequencies is reduced or eliminated, and the display effect is improved.

[0057] Based on the above embodiments, Figure 8 is another schematic diagram of the driving timing of the pixel circuit provided by the 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, and the power supply signal line 14 is electrically connected to the power supply signal terminal PVDD for transmitting a power supply signal to the power supply signal terminal PVDD; the first driving mode further corresponds to a first power supply signal V dd1 , the second driving mode further corresponds to a second power supply signal V dd2 , and the third driving mode further corresponds to a third power supply signal V dd3 ; wherein,

[0058]

[0059] Specifically, combining the working process of the foregoing pixel circuit, it can be known that when the first power supply signal is different, the potential written on the source stage of the driving transistor M3 is different. Thus, the gate-source voltage difference of the driving transistor is different during the light-emitting stage, and the driving current generated by the driving transistor M3 is different, controlling the light-emitting brightness of the light-emitting element 11 to be different. 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 1It 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 first power signal on the emission brightness as described above, it is possible to adjust the display brightness difference at different driving frequencies by setting different first power signals at different driving frequencies, that is, different from the solution in the prior art where the first power signal is the same at different driving frequencies. In the embodiments of the present invention, the first power signal that is dynamically adjusted at different driving frequencies is creatively set, and the display brightness at different driving frequencies is adjusted by the dynamically adjusted first power signal, reducing the display brightness difference at different driving frequencies of the display panel and improving the display effect.

[0060] 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 power signal V dd1 , the second driving mode corresponds to a second driving frequency F2 and a second power signal V dd2 , and the third driving mode corresponds to a third driving frequency F3 and a third power signal V dd3 ; where V dd1 ≠V dd2 ≠V dd3 , that is, the first power signals corresponding to different driving frequencies are different. Thus, the display brightness at different driving frequencies is adjusted by the dynamically changing first power 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 signal is different from the degree of change of the driving frequency. Thus, the display brightness at different driving frequencies is further adjusted by the dynamically changing first power signal, reducing the display brightness difference at different driving frequencies of the display panel and improving the display effect.

[0061] Based on the above embodiments, the driving transistor includes a P-type transistor, V dd3 >V dd2 >V dd1 >0; or, the driving transistor includes an N-type transistor, 0<V dd3 <V dd2 <V dd1 .

[0062] 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, setting V dd3 >V dd2 >V dd1>0, that is, the smaller the driving frequency, the larger the first power 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 display panel is adjusted by dynamically adjusting the first power 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.

[0063] 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 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 display panel is adjusted by dynamically adjusting the first power 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.

[0064] Optionally,

[0065] It can be known from the above description that 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 during the light-emitting stage to affect the light-emitting brightness of the light-emitting element. That is to say, the first-stage far signal is an indirect influencing factor of the light-emitting brightness. Therefore, set the change degree of the first power 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 first power signal to the display brightness can match the change degree of the driving frequency, that is, the light-emitting brightness of the display panel at different driving frequencies can be better adjusted to reduce or eliminate the display brightness difference when the display panel switches between different driving frequencies, and improve the display effect.

[0066] Optionally, |V dd2 -V dd3 | > |V dd1 -V dd2 |.

[0067] 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 is from Figure 1It can also be obtained from the 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 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 signal. In this way, the change trend of the first power 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 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.

[0068] Optionally, Figure 9 is a schematic diagram of the driving timing of another pixel circuit provided by an 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 emission maintaining 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 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 maintaining 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; or, the driving transistor includes an N-type transistor, 0<V ddn2 <V ddn1 <V ddm .

[0069] 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, that is, F n <F m , at this time, control the first power signal in the n-th driving mode to be greater than the first power signal corresponding to the m-th driving mode, that is, V ddn >V ddm >0, 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, that is, F n <Fm At this time, the first power signal in the nth driving mode is controlled to be less than the first power signal corresponding to the mth driving mode, that is, 0 < V ddn <V ddm (not shown in the figure). At this time, it can be ensured that the brightness difference between the nth driving mode and the mth driving mode is small.

[0070] 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 signal corresponding to the light emission holding stage is larger, that is, the mth first power signal V ddm corresponding to the mth driving mode, the n1th first power signal V ddn1 corresponding to the signal writing stage in the nth driving mode, and the n2th first power signal V ddn2 corresponding to the light emission holding stage in the nth driving mode satisfy |V ddn2 >V ddn1 >V ddm >0, as Figure 9 shown. In this way, the light 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 smaller, that is, the mth first power signal V ddm corresponding to the mth driving mode, the n1th first power signal V ddn1 corresponding to the signal writing stage in the nth driving mode, and the n2th first power signal V ddn2 corresponding to the light emission holding stage in the nth driving mode satisfy 0 < V ddn2 <V ddn1 <V ddm . In this way, the light 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 in 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.

[0071] 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 embodiment of the present invention does not limit the specific values and specific multiple relationships between the larger driving frequency and the smaller driving frequency.

[0072] Based on the above embodiments,

[0073] 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 during the light-emitting stage to affect the light-emitting 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 during the light-emitting stage to affect the light-emitting brightness of the light-emitting element. To sum up, the first power signal has a more direct impact on the light-emitting brightness of the light-emitting element, and the initialization signal has a more indirect impact on the light-emitting brightness of the light-emitting element compared to the first power signal. Therefore, when adjusting the light-emitting 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 can be reduced or eliminated, and the display effect can be improved.

[0074] Based on the above embodiments, |V dd1 -|V ref1 || > |V dd2 -|V ref2 || > |V dd3 -|V ref3 ||.

[0075] As described above, the first power signal has a more direct impact on the light-emitting brightness of the light-emitting element, and the initialization signal has a more indirect impact on the light-emitting brightness of the light-emitting element compared to the first power signal. Therefore, to ensure the adjustment of the display brightness at different driving frequencies, the change degree of the first power signal can be set to be less than the change degree of the initialization signal. That is to say, as the driving frequency decreases, the difference between the absolute values of the first power signal and the initialization signal gradually decreases, that is, |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 signal, the display brightness difference when the display panel switches between different driving frequencies can be reduced or eliminated, and the display effect can be improved.

[0076] 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 signal V ddp , the q-th driving mode corresponds to the q-th driving frequency F q 、the q-th initialization signal V ref q and the q-th power 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.

[0077] Exemplarily, the q-th driving mode is the main frequency driving mode, and 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; alternatively, 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-reducing driving modes obtained based on the normal driving mode according to display requirements (such as reducing power consumption); alternatively, the main frequency driving mode here 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 the frequency-reducing 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 is the frequency-reducing driving frequency based on the maximum driving frequency F q . 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, and the driving frequency, initialization signal and first power signal corresponding to the main frequency driving mode and the driving frequency, initialization signal and first power signal corresponding to the frequency-reducing driving mode can be set to 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, and the driving frequency, initialization signal and first power signal corresponding to the main frequency driving mode and the driving frequency, initialization signal and first power signal corresponding to the frequency-reducing driving mode can be set to satisfy That is, by reasonably setting the correspondence 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 correspondence at different driving frequencies, ensuring 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 - Vddp ) = (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 drive frequencies, initialization signals, and first power supply signals corresponding to the main frequency drive mode and the drive frequencies, initialization signals, and first power supply signals corresponding to the frequency-down drive mode meet the above limitations, the display brightness difference between different drive frequencies is within 1%, ensuring that the display brightness difference of the display panel at different drive frequencies is reduced or eliminated, and improving the display effect.

[0078] Optionally, continuing to refer to Figure 3 shown, the pixel circuit 12 provided by the embodiment of the present invention further includes a reset transistor M7 and a reset signal terminal VREF2; the reset signal terminal VREF2 is respectively electrically connected to the initialization signal line 13 and the first end of the reset transistor M7, 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 in different drive modes, the signals received by the reset signal terminal VREF2 are the same.

[0079] Specifically, the pixel circuit 12 provided in the embodiment of the present invention may further include a reset transistor M7. The reset transistor M7 is configured 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, in combination with the enable signal of the control terminals of the initialization transistor M5 and the reset transistor M7, 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, 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 in different driving modes, and the light-emitting brightness is adjusted by the initialization signals at different driving frequencies, the signals received by the reset signal terminal VREF2 are the same in different driving modes. That is to say, the change of the driving frequency does not affect the reset received by the reset signal terminal VREF2, or in other words, the change of 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.

[0080] It should be noted that Figure 3 Only the example where the initialization transistor M5 and the reset transistor M7 are connected to the same initialization signal terminal is described. At this time, the initialization signal terminal can provide different initialization signals (reset signals) in a time-sharing manner. Optionally, the initialization transistor M5 and the reset transistor M7 can be connected to different initialization signal terminals (not shown in the figure), and the different initialization signal terminals respectively provide corresponding initialization signals and reset signals to realize 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 of the driving frequency also does not affect the reset received by the reset signal terminal, or in other words, the change of the initialization signal does 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.

[0081] Based on the same inventive concept, the embodiment of the present invention also 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:

[0082] S110. In the first driving mode, drive the pixel circuit with a first driving frequency and a first initialization signal.

[0083] S120. In the second driving mode, drive the pixel circuit with a second driving frequency and a second initialization signal.

[0084] S130. In the third driving mode, drive the pixel circuit with a third driving frequency and a third initialization signal.

[0085] 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 ,

[0086] Specifically, the reduction amplitudes of 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. And due to different initialization signals, the initialization degrees of the driving transistors are different. Furthermore, the data signals written into the gates of the driving transistors during the data signal writing stage are different. Thus, the gate-source voltage differences of the driving transistors during the light-emitting stage are different, the driving currents generated by the driving transistors are different, and the light-emitting brightnesses of the light-emitting elements are different. Therefore, different from the prior art solution 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, adjust the display brightness at different driving frequencies through the dynamically adjusted initialization signals, reduce the display brightness differences of the display panel at different driving frequencies, and improve the display effect.

[0087] Specifically, in the first driving mode, drive the pixel circuit with a first driving frequency and a first initialization signal. In the second driving mode, drive the pixel circuit with a second driving frequency and a second initialization signal. In the third driving mode, drive the pixel circuit with a third driving frequency and a third initialization signal. Wherein, 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 differences of the display panel at different driving frequencies are 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. Thus, the display brightness at different driving frequencies is further adjusted by the dynamically changing initialization signal, reducing the display brightness difference at different driving frequencies of the display panel and improving the display effect.

[0088] In summary, the driving method provided by the embodiments of the present invention adjusts the display brightness difference under different driving modes by setting different initialization signals under different driving modes, and further adjusts the display brightness under different driving modes by setting the degree of change of the driving frequency and the degree of change of the initialization signal under different driving modes to be different, reducing the display brightness difference at different driving frequencies of the display panel and improving the display effect.

[0089] 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 scan signal input terminal; when switching between different driving modes, the switching moment of the initialization signal V ref input from the initialization signal terminal is earlier than the switching moment of the scan signal Scan1 input from the scan signal input terminal; and the switching moment of the initialization signal V ref corresponding to the current driving mode is within the enabling stage of the light emission control signal Emit corresponding to the previous driving mode.

[0090] Exemplarily, as Figure 11 shown, when switching between different driving modes, the switching moment of the initialization signal V ref input from the initialization signal terminal is earlier than the switching moment of the scan signal Scan1 input from the scan signal input terminal. Thus, it can be ensured that a stable initialization signal V ref can be input to the gate of the driving transistor throughout the enabling stage of the scan signal Scan1, rather than a suddenly jumping initialization signal V ref , ensuring the stability of the first-frame signal writing at different driving frequencies. Further, the switching moment of the initialization signal V ref corresponding to the current driving mode 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, ensuring the normal operation of the display panel.

[0091] Based on the same inventive concept, the embodiments of the present invention also provide a display device. Figure 12 is a schematic structural diagram of a display device provided by the embodiments of the present invention. As Figure 12As shown, the display device 100 includes the display panel 10 in the above embodiment. Since the display device includes the display panel of any embodiment of the present invention, 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 an in-vehicle display device, etc., and the embodiment of the present invention does not limit this.

[0092] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. 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, combinations with each other, 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 detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it may also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that, It includes a light-emitting element and a pixel circuit electrically connected to the light-emitting element; The pixel circuit includes a driving transistor, and a first end of the driving transistor is electrically connected to a power supply signal line; 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 power signal V dd1 , the second driving mode corresponds to a second driving frequency F2 and a second power signal V dd2 , and the third driving mode corresponds to a third driving frequency F3 and a third power signal V dd3 ; where F1 > F2 > F3, and 2. The display panel according to claim 1, wherein The pixel circuit includes a first transistor, a first end of the first transistor is electrically connected to an initialization signal line, a second end of the first transistor is electrically connected to the driving transistor, or the second end of the first transistor is electrically connected to the light-emitting element; The first driving mode corresponds to a first initialization signal V ref1 , the second driving mode corresponds to a second initialization signal V ref2 , the third driving mode corresponds to a third initialization signal V ref3 ; where F1 > F2 > F3, and V ref1 ≠ V ref2 , V ref1 ≠ V ref3 , 3. The display panel according to claim 2, wherein 4. The display panel according to claim 2, wherein, |V ref2 -V ref3 |>|V ref1 -V ref2 |。 5. The display panel according to claim 1, characterized in that, The pixel circuit includes a first transistor, a first end of the first transistor is electrically connected to an initialization signal line; a second end of the first transistor is electrically connected to the driving transistor, or the second end of the first transistor is electrically connected to the light-emitting element; The driving modes of the display panel include an i-th driving mode and a j-th driving mode, and the j-th driving mode includes a signal writing stage and a light-emission 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 |.

6. The display panel according to claim 2, wherein 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.

7. The display panel according to claim 2, characterized in that, The driving modes of the display panel include a k-th driving mode and an l-th driving mode, wherein the k-th 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 F l an integer multiple of; 8. The display panel according to claim 2, wherein The driving modes of the display panel include an s-th driving mode and a w-th driving mode, wherein the w-th driving mode is a 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, 9. The display panel according to claim 1, characterized in that, 10. The display panel according to claim 1, characterized in that, |V dd2 -V dd3 |>|V dd1 -V dd2 |。 11. The display panel according to claim 1, wherein The driving modes of the display panel include an m-th driving mode and an n-th driving mode, the n-th driving mode includes a signal writing stage and a light-emission 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 power supply signal V ddn1 , the light emission holding stage in the n-th driving mode corresponds to the n2-th power supply 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 .

12. The display panel according to claim 1, wherein 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 .

13. The display panel according to claim 2, characterized in that, 14. The display panel according to claim 2, characterized in that, |V dd1 -|V ref1 ||>|V dd2 -|V ref2 ||>|V dd3 -|V ref3 ||。 15. The display panel according to claim 2, wherein The driving modes of the display panel include a p-th driving mode and a q-th driving mode, wherein the q-th 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.

16. The display panel according to claim 2, wherein The second end of the first transistor is electrically connected to the gate of the driving transistor; or, The second end of the first transistor is electrically connected to the second end of the driving transistor through a second transistor.

17. A driving method for a display panel, which is used to drive the display panel according to any one of claims 1-16, characterized in that, The driving method includes: In a first driving mode, driving the pixel circuit with a first driving frequency and a first power supply signal; In a second driving mode, driving the pixel circuit with a second driving frequency and a second power supply signal; In a third driving mode, driving the pixel circuit with a third driving frequency and a third power supply signal; wherein, 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 power signal V dd1 , the second driving mode corresponds to a second driving frequency F2 and a second power signal V dd2 , and the third driving mode corresponds to a third driving frequency F3 and a third power signal V dd3 ; wherein, F1 > F2 > F3, and 18. A display device, characterized in that, It includes the display panel according to any one of claims 1-16.

Images