Driving method of display panel, display device

Abstract

This invention provides a driving method and display device for a display panel, relating to the display field, to improve screen flickering. The display panel has a low-frequency driving mode, in which a holding phase is inserted between two active phases. The driving method includes: in the low-frequency driving mode, providing a light emission control signal with a duty cycle of a% to the pixel circuit during the active phase, where the duty cycle is the proportion of the active level in the light emission control signal to the pulse width; and performing a first switching and a second switching on the light emission control signal during the holding phase. The first switching occurs before the second switching, the panel brightness during the first switching is greater than the panel brightness during the second switching, the duty cycle of the light emission control signal after the second switching is b%, b > a, and the total duration of the active level of the light emission control signal after the first switching within one frame is between the total duration of the active level of the light emission control signal with duty cycles of a% and b% within one frame.

Description

[Technical Field]

[0001] This invention relates to the field of display technology, and more particularly to a driving method for a display panel and a display device. [Background Technology]

[0002] In Always On Display (AOD) mode, to reduce power consumption, the display panel typically refreshes at a lower data refresh rate. In this mode, the display panel's data refresh cycle includes an active phase and a hold phase. The driving transistors in the pixel circuit only write data voltage during the active phase; during the hold phase, they do not rewrite data voltage. However, during the hold phase, the gate potential of the driving transistors changes due to leakage current, causing the display panel's brightness to gradually decrease, resulting in noticeable flickering. [Summary of the Invention]

[0003] In view of this, embodiments of the present invention provide a driving method and a display device for a display panel, which can effectively improve the screen flickering phenomenon in low-frequency driving mode.

[0004] On one hand, embodiments of the present invention provide a driving method for a display panel, the display panel having a low-frequency driving mode, wherein a holding phase is inserted between two effective phases in the low-frequency driving mode;

[0005] The driving method includes: in the low-frequency driving mode, providing a light emission control signal with a duty cycle of a% to the pixel circuit during the effective phase, wherein the duty cycle is the proportion of the effective level in the light emission control signal to the pulse width, and performing a first switching and a second switching on the light emission control signal during the holding phase;

[0006] Wherein, the first switching is performed before the second switching, the panel brightness when the first switching is performed is greater than the panel brightness when the second switching is performed, the duty cycle of the light emission control signal after the second switching is b%, b > a, and the total effective level duration of the light emission control signal after the first switching is between the total effective level duration of the light emission control signal with duty cycle a% and the total effective level duration of the light emission control signal with duty cycle b% within one frame.

[0007] On the other hand, embodiments of the present invention provide a display device for applying the above-described driving method, including:

[0008] The display panel has a low-frequency drive mode, in which a holding phase is inserted between two effective phases;

[0009] A driving structure is configured to provide a light emission control signal with a duty cycle of a% to the pixel circuit during the effective phase in the low-frequency driving mode, wherein the duty cycle is the proportion of the effective level in the light emission control signal to the pulse width, and to perform a first switching and a second switching on the light emission control signal during the holding phase.

[0010] Wherein, the first switching is performed before the second switching, the panel brightness when the first switching is performed is greater than the panel brightness when the second switching is performed, the duty cycle of the light emission control signal after the second switching is b%, b > a, and the total effective level duration of the light emission control signal after the first switching is between the total effective level duration of the light emission control signal with duty cycle a% and the total effective level duration of the light emission control signal with duty cycle b% within one frame.

[0011] One of the above technical solutions has the following beneficial effects:

[0012] In designing the light emission control signal after the first switch, this invention sets the total effective level duration within one frame between the total effective level durations of the light emission control signals with duty cycles of a% and b% within one frame. This allows for a small change in the total effective level duration, resulting in a slight increase in panel brightness. For example, taking a light emission control signal comprising two pulses within one frame as an example, assuming the change in pulse width of the effective level in the pulse with a duty cycle of b% is 4H compared to the pulse with duty cycle a%, in one configuration, the duty cycles of the two pulses after the first switch can be designed to be a% and b, respectively, to satisfy the limitation on the total effective level duration of the light emission control signal after the first switch within one frame. In this case, the pulse width of the effective level in one pulse remains unchanged, while the pulse width of the effective level in the other pulse changes by 4H, resulting in an average change in the pulse width of the effective level in the two pulses of only 2H. Therefore, a small and more precise correction to the panel brightness can be achieved. Since the panel brightness decays only slightly during the first switch, this small and precise brightness correction can just bring the panel brightness back to its initial brightness without causing overcompensation.

[0013] Since the human eye is an integral system, the flicker observed is a brightness difference over a period of time. Therefore, compared with the existing technology that only increases the panel brightness once when the panel brightness decays to the brightness threshold, the present invention performs a first switch with a small effective level adjustment on the light emission control signal before the panel brightness decays to the threshold brightness. This allows for multiple gradual and gentle increases in brightness within the data refresh cycle, resulting in a more uniform overall brightness adjustment and effectively mitigating the flicker problem caused by brightness fluctuations. [Attached Image Description]

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a timing diagram of the light emission control signal in the prior art;

[0016] Figure 2 This is a schematic diagram illustrating the change of brightness over time in existing technology;

[0017] Figure 3 This is a timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram illustrating the change of brightness over time, provided in an embodiment of the present invention.

[0019] Figure 5 This is another timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0020] Figure 6 This is another timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0021] Figure 7 This is yet another timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0022] Figure 8 This is yet another timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0023] Figure 9 This is yet another timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0024] Figure 10 This is another timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0025] Figure 11 This is another timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0026] Figure 12 This is yet another timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0027] Figure 13 This is a schematic diagram of a pixel circuit provided in an embodiment of the present invention;

[0028] Figure 14 This is a schematic diagram of a first transistor provided in an embodiment of the present invention;

[0029] Figure 15 This is a schematic diagram of another structure of the first transistor provided in an embodiment of the present invention;

[0030] Figure 16 This is a schematic diagram of a display device provided in an embodiment of the present invention;

[0031] Figure 17 This is another structural schematic diagram of the display device provided in an embodiment of the present invention.

Detailed Implementation Methods

[0032] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0035] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0036] As described in the background section, existing display panels suffer from low-frequency flickering. To improve this issue, existing technologies can adjust the duty cycle of the light emission control signal when the panel brightness decays to a threshold brightness level, thereby increasing the light emission duration and boosting the brightness.

[0037] For example, such as Figure 1 and Figure 2 As shown, Figure 1 This is a timing diagram of the light emission control signal in the prior art. Figure 2This diagram illustrates the change in brightness over time in existing technology. During the effective phase ad' of the data refresh cycle T', a light emission control signal Emit' with a duty cycle of a% is provided to the pixel circuit. During the hold phase kd', the panel brightness gradually decreases due to leakage current. When the panel brightness decreases to the threshold brightness, the light emission control signal Emit' can be switched S, adjusting its duty cycle to b%, thereby increasing the pulse width of the effective level (e.g., low level) in the light emission control signal Emit'. This utilizes the positive influence of the light emission time on brightness to offset the negative influence on brightness caused by leakage current. Figure 2 The time corresponding to "S" in the diagram can be considered as Figure 1 The timing of switching the emission control signal Emit' to S, combined with Figure 2 It can be seen that during the brightness decay process of the entire data refresh cycle T', after switching S on the emission control signal Emit', the brightness will also increase because the duty cycle of the emission control signal Emit' is increased. However, it should be noted that... Figure 2 This is merely to demonstrate the trend of brightness change before and after switching to S. Figure 2 The duration of the data refresh cycle T' and the timing of the switch S shown in the figure are not related to... Figure 1 To achieve a precise correspondence.

[0038] However, the inventors discovered during their research that, determined by the circuit structure of the driving circuit used to output the light emission control signal Emit', when the duty cycle of the light emission control signal Emit' changes, the pulse width of its effective level must change to an integer multiple of 4 line times (H), such as 4H, 8H, etc.

[0039] For display products such as mobile phones and computers with a large number of pixel rows, the row time is relatively short. Therefore, when the duty cycle of the light emission control signal Emit' is adjusted to change the pulse width of its effective level by 4H (or 8H, etc.), the increase in brightness will not be too large. Thus, while increasing the panel brightness to the initial brightness of the panel, the brightness fluctuation caused by the increase can be avoided and not be perceived by the human eye.

[0040] However, for display products like watches with a small number of pixel rows, the row time is relatively long. Therefore, when the pulse width of the effective level in the Emit' light emission control signal changes by 4H (or 8H, etc.), the light emission time will increase significantly. In this case, after adjusting the duty cycle of the Emit' light emission control signal, the brightness of the panel will be greatly increased. The brightness fluctuation caused by this increase may exceed the critical brightness change that the human eye can detect as flickering, thus aggravating the flickering.

[0041] To address this, embodiments of the present invention provide a driving method for a display panel, such as... Figure 3 and Figure 4 As shown, Figure 3 This is a timing diagram of the Emit light emission control signal provided in an embodiment of the present invention. Figure 4 This is a schematic diagram illustrating the brightness variation over time according to an embodiment of the present invention. The display panel has a low-frequency driving mode, in which a hold phase kd is inserted between two active phases ad. That is, in the low-frequency driving mode, a data refresh cycle T includes one active phase ad and one hold phase kd. The active phase ad includes one frame, and the hold phase kd includes at least one frame. The frame in the active phase ad can be defined as an active frame, and the frame in the hold phase kd can be defined as a hold frame.

[0042] The driving method provided in this embodiment of the invention includes: in a low-frequency driving mode, providing a light emission control signal Emit with a duty cycle of a% to the pixel circuit during the effective phase ad, and performing a first switching FS and a second switching SS on the light emission control signal Emit during the holding phase kd, wherein the duty cycle is the proportion of the effective level in the light emission control signal Emit to the pulse width.

[0043] In this embodiment, the first switching FS occurs before the second switching SS. The panel brightness during the execution of the first switching FS is greater than the panel brightness during the execution of the second switching SS. The duty cycle of the emission control signal Emit after the execution of the second switching SS is b%, where b > a. The total effective level duration of the emission control signal Emit within one frame time F after the execution of the first switching FS is between the total effective level durations of the emission control signals Emit with duty cycles of a% and b% within one frame time F. In this embodiment, the effective level of the emission control signal Emit is illustrated using a low level as an example.

[0044] In this embodiment of the invention, the panel brightness when performing the second switching SS on the Emit control signal can be the aforementioned threshold brightness. That is, the second switching SS can be regarded as the switching of the Emit control signal in the prior art when the panel brightness decays to the threshold brightness. Since the panel brightness when performing the first switching FS is greater than the panel brightness when performing the second switching SS, this embodiment of the invention can be regarded as performing the first switching FS on the Emit control signal before the panel brightness decays to the threshold brightness. After performing the first switching FS, when the boosted panel brightness decays to the threshold brightness again, the second switching SS is then performed on the Emit control signal.

[0045] Specifically, in designing the Emit control signal after the first FS switch, this embodiment of the invention sets the total effective level duration within one frame time F between the total effective level durations of the Emit control signal with duty cycles of a% and b% within one frame time F. This allows for a small change in the total effective level duration, resulting in a slight increase in panel brightness. For example, taking the Emit control signal comprising two pulses within one frame time F as an example, assuming the change in pulse width of the effective level in the pulse with duty cycle b% is 4H compared to the pulse with duty cycle a%, in one setting method, combined with... Figure 3 The duty cycles of the two pulses after the first FS switching can be designed as a% and b% respectively to meet the limitation on the total effective duration of the Emit control signal within one frame time F after the first FS switching. At this time, the pulse width of the effective level in one pulse remains unchanged, while the pulse width of the effective level in the other pulse changes by 4H, resulting in an average change of only 2H in the pulse width of the effective level across the two pulses. This allows for a small, more precise correction to the panel brightness. Since the attenuation of panel brightness during the first FS switching is also relatively small, this small and precise brightness correction can precisely bring the panel brightness back to its initial brightness without overcompensation.

[0046] Since the human eye is an integral system, the flicker observed is a brightness difference over a period of time. Therefore, compared with the existing technology that only increases the panel brightness once when the panel brightness decays to the brightness threshold, the present invention performs a first switching FS with a small effective level adjustment on the Emit light emission control signal before the panel brightness decays to the threshold brightness. This allows for multiple gradual and gentle increases in brightness within the data refresh cycle, resulting in a more uniform overall brightness adjustment and effectively mitigating the flicker problem caused by brightness fluctuations.

[0047] It should be noted that, Figure 4 This is merely to demonstrate the trend of brightness change before and after performing the first FS switch and the second SS switch. Figure 4 The duration of the data refresh cycle T, the time of executing the first FS switch, and the time of executing the second SS switch shown in the diagram are not consistent with... Figure 3 To achieve a precise correspondence.

[0048] Furthermore, it should be noted that, in this embodiment of the invention, after performing the first switching FS, under the condition that the total effective level duration within one frame time F of the Emit control signal is between the total effective level durations within one frame time F of the Emit control signal with duty cycles of a% and b%, the average change in the pulse width of the effective level of the Emit control signal can vary depending on the different designs of the pulse duty cycles. For example, assuming that the change in the pulse width of the effective level in a pulse with a duty cycle of b% is 4H compared to a pulse with a duty cycle of a%, such as... Figure 5 As shown, Figure 5 Another timing diagram of the emission control signal Emit provided in the embodiment of the present invention is shown. The emission control signal Emit includes 4 pulses in one frame time F. After the first switching FS is executed, the duty cycle of three of the pulses is a%, and the duty cycle of the other pulse is b%. At this time, the average change in the pulse width of the effective level can be only 1H.

[0049] In one feasible implementation, such as Figure 6 As shown, Figure 6 In another timing diagram of the Emit control signal provided in this embodiment of the invention, the number of times the first switching FS is executed is x, where x > 1. Specifically, the panel brightness during the i-th first switching FS is greater than the panel brightness during the (i+1)-th first switching FS, and the total effective level duration of the Emit control signal within one frame time F after the i-th first switching FS is less than the total effective level duration of the Emit control signal within one frame time F after the (i+1)-th first switching FS, where i takes values ​​of 1, ..., x.

[0050] Since 4% is the critical brightness change that the human eye can perceive as flickering, in one setup, the threshold brightness can be set to 96% of the initial panel brightness. Assuming the first switching FS is executed 3 times, in one setup, the first switching FS can be performed on the Emit control signal when the panel brightness decays to 99% of the initial panel brightness, the second switching FS can be performed on the Emit control signal when the panel brightness decays to 98% of the initial panel brightness, and the third switching FS can be performed on the Emit control signal when the panel brightness decays to 97% of the initial panel brightness.

[0051] When the Emit control signal undergoes multiple first switching FS operations, this setting method involves these multiple first switching FS operations performed under the trend of gradually increasing panel brightness decay. This method provides a more gradual and gentle correction to brightness. Moreover, in the above setting method, compared to the (i+1)th first switching FS, the panel brightness is slightly higher when the i-th first switching FS is performed, and the total effective level duration of the Emit control signal within one frame time F after the i-th first switching FS is slightly shorter. That is, the i-th first switching FS is performed when the panel brightness decay is relatively small, and only the total effective level duration of the Emit control signal within one frame time F is slightly increased. Therefore, the increase in brightness due to this total effective level duration can just compensate for the small portion of brightness decay in the panel, making the compensation amount of the Emit control signal for brightness match the decay amount. Compared to the i-th first switching FS, the panel brightness is slightly lower during the (i+1)-th first switching FS, and the total effective level duration of the Emit control signal within one frame time F after the (i+1)-th first switching FS is slightly longer. That is, the (i+1)-th first switching FS significantly increases the total effective level duration of the Emit control signal within one frame time F when the panel brightness decays considerably. Therefore, the increase in brightness due to this increased effective level duration precisely compensates for the significant decrease in panel brightness, matching the compensation amount of the Emit control signal with the degree of decay. In other words, in this setting, the degree of adjustment of the total effective level duration of the Emit control signal within one frame time F after each first switching FS is matched to the current degree of panel brightness decay. This ensures that the panel brightness is better boosted to its initial brightness after each first switching FS, improving the brightness compensation effect.

[0052] Furthermore, to achieve better brightness control, when x ≥ 3, the brightness difference between the panel brightness during two consecutive executions of the first switching FS can be set to be equal. For example, the brightness difference between the panel brightness during two consecutive executions of the first switching FS can be 1% of the initial panel brightness.

[0053] It should be noted that, due to the limitations of brightness detection accuracy, it is difficult to achieve absolute equality between different brightness differences. In this embodiment of the invention, different brightness differences that fluctuate within a certain positive and negative range should still be considered as equal to each other. For example, when the difference between different brightness differences is ±0.1% of the initial brightness of the panel, these different brightness differences can be considered as equal.

[0054] In one feasible implementation, the panel brightness during the second SS switching is: The panel brightness during the first FS switch is less than Among them, f c f is half the clock frequency corresponding to the Emit control signal. r L is the data refresh rate in low-frequency drive mode, and L is the initial brightness of the panel. The initial brightness of the panel is the brightness of the display panel when ad provides the light emission control signal Emit with a duty cycle of a% to the pixel circuit during the effective phase.

[0055] It is understandable that the holding period kd in the data refresh cycle T is related to the data refresh frequency. The lower the data refresh frequency, the longer the holding period kd in the data refresh cycle T, and correspondingly, the longer the leakage time, and the greater the impact of leakage on brightness. Therefore, in designing the second brightness (threshold brightness) in this embodiment of the invention, it can be set to be related to the data refresh frequency f. r Related, to be based on different data refresh frequencies f r Adaptively adjust the threshold brightness. For example, the data refresh rate f. r When the brightness is very low, the threshold brightness setting will also be lower, so that the display panel inserts multiple first switching FSs at certain intervals between the brightness decaying to the threshold brightness, making the brightness correction under ultra-low frequency drive more gradual.

[0056] In this embodiment of the invention, m can be equal to 2. In this case, by combining m and f r and f c The difference between the threshold brightness and the initial brightness of the panel, which are jointly determined, will better match the brightness fluctuations generated when the pulse width of the effective level in the Emit light emission control signal changes by an integer multiple of 4H. That is, after the second switching SS is executed, the threshold brightness can be better pulled up to the initial brightness.

[0057] Furthermore, when the number of times the first FS switch is executed is 1, the panel brightness during the first FS switch is...

[0058] For example, when m=2, the panel brightness during the first FS switch is... With this setting, the first switching FS of the Emit light control signal can be executed when the panel brightness tends to decay to the midpoint between the initial panel brightness and the threshold brightness, resulting in more uniform overall brightness control.

[0059] Alternatively, when the number of times the first FS switch is executed is x, where x ≥ 3, the panel brightness during the i-th first FS switch is... n i <m, i takes values ​​1, ..., x in sequence, where n1 < n2 < ... < n x And, n x -nx-1 =n x-1 -n x-2 =…=n2-n1.

[0060] For example, when m=2 and x=3, the panel brightness is... At that time, the first switching FS is performed on the Emit light emission control signal. When the brightness of the panel after the increase decays to At that time, the first switching FS is performed for the Emit light emission control signal for the second time. When the brightness of the panel after the increase decreases to At this time, the first switching FS is executed for the third time on the Emit control signal. This setting allows for multiple first switching FS operations even as the panel brightness decays with a uniform increasing trend, resulting in more uniform overall brightness control. Furthermore, testing has verified that when n1 = 0.67, n2 = 1, and n3 = 1.33, the difference between the panel brightness at each first switching FS execution and the initial panel brightness is very similar to the brightness fluctuation produced when the pulse width of the effective level in the Emit control signal changes by an integer multiple of 4H. Therefore, after each first switching FS execution, the panel brightness can be pulled back to its initial brightness, improving the brightness compensation effect.

[0061] In one feasible implementation, the driving method provided by the present invention further includes: the panel brightness when performing the first switching FS is a first brightness, and the panel brightness when performing the second switching SS is a second brightness, wherein the second brightness is the aforementioned threshold brightness; the first switching FS is performed on the light emission control signal Emit in response to a first trigger command at a first time point, and the second switching SS is performed on the light emission control signal Emit in response to a second trigger command at a second time point, wherein the first trigger command includes first brightness information and first time point information, and the first trigger command includes second brightness information and second time point information.

[0062] Based on the above design, embodiments of the present invention can perform brightness tests on the display panel in low-frequency driving mode before the display panel leaves the factory, so as to know the time point when the first switch FS and the second switch SS are executed each time. For example, taking the execution of two first switching FS on the Emit light emission control signal as an example, before the display panel leaves the factory, the brightness of the display panel is tested in low-frequency drive mode: after providing the pixel circuit with the Emit light emission control signal with a duty cycle of a% during the effective phase ad, the decay of the panel brightness begins to be monitored. During the hold phase kd, when the panel brightness decays to the first first brightness, the current time point is recorded as the first first time point. For example, it is recorded which frame of the hold phase kd the panel brightness decays to the first first brightness. Then, the first first switching FS is executed on the Emit light emission control signal, and the decay of the panel brightness continues to be monitored. When the panel brightness decays to the second first brightness, the current time point is recorded as the second first time point. Then, the second first switching FS is executed on the Emit light emission control signal, and the decay of the panel brightness continues to be monitored. When the panel brightness decays to the second brightness, the current time point is recorded as the second time point.

[0063] In this way, after the display panel is put into use, the corresponding trigger command can be issued directly when the time point arrives, based on the recorded time points, to control the corresponding switching of the light emission control signal Emit. There is no need to monitor the panel brightness in real time during the display process to judge the brightness decay, making the adjustment method simpler.

[0064] In one feasible implementation, see again Figure 3 and Figure 5 During the effective phase ad, the emission control signal Emit includes at least two pulses within one frame time F. During the hold phase kd, the emission control signal Emit after performing the first switch FS and the second switch SS includes at least two pulses within one frame time F.

[0065] This setup allows for more precise control of brightness using multiple pulses within a single frame time F. For example, after the first switching FS is executed, the Emit control signal has multiple pulses within a single frame time F. By designing different duty cycles for these pulses, the total effective duration of the Emit control signal within a single frame time F can be adjusted to varying degrees, thereby achieving more flexible and precise control of brightness.

[0066] When the emission control signal Emit after the first FS switch includes at least two pulses within a frame time F, in one setting mode, such as Figure 7 As shown, Figure 7This is another timing diagram of the light emission control signal Emit provided in the embodiment of the present invention. After the first switching FS is executed, the light emission control signal Emit includes a first pulse 1 and a second pulse 2 within a frame time F. The duty cycle of the second pulse 2 is greater than the duty cycle of the first pulse 1.

[0067] In this embodiment of the invention, by ensuring that the Emit light-emitting control signal after performing the first switching FS includes at least two pulses with different duty cycles within a frame time F, the total effective duration of the Emit light-emitting control signal within a frame time F can be adjusted to different degrees by adjusting the number of these two pulses. For example, when a frame time F includes three pulses, designing two of them as the first pulse 1 or designing one of them as the first pulse 1 will result in different total effective durations of the Emit light-emitting control signal within a frame time F. This allows for flexible adjustment of the degree of brightness enhancement after performing the first switching FS, making the enhanced brightness closer to the initial brightness of the panel.

[0068] Furthermore, see again Figure 7 The duty cycle of the first pulse 1 is a%, and the duty cycle of the second pulse 2 is b%. Thus, in the entire driving process, the duty cycle design of the pulses in the Emit control signal only includes two types: a% and b%, which reduces the design difficulty.

[0069] Of course, in other optional embodiments of the present invention, the duty cycle of at least one of the first pulse 1 and the second pulse 2 may also be different from a% and b%. For example, in one configuration, such as Figure 8 As shown, Figure 8 In another timing diagram of the Emit control signal provided in this embodiment of the invention, compared to a pulse with a duty cycle of a%, the change in the pulse width of the effective level in a pulse with a duty cycle of b% is 12H. The duty cycle of the first pulse 1 can be designed to be c1%, and the duty cycle of the second pulse 2 can be designed to be c2%. Compared to a pulse with a duty cycle of a%, the change in the pulse width of the effective level in a pulse with a duty cycle of c1% is 4H, and the change in the pulse width of the effective level in a pulse with a duty cycle of c2% is 8H. Alternatively, in another setting method, such as... Figure 9 As shown, Figure 9 In another timing diagram of the emission control signal Emit provided in the embodiment of the present invention, compared with a pulse with a duty cycle of a%, the change in the pulse width of the effective level in a pulse with a duty cycle of b% is 8H. The duty cycle of the first pulse 1 can be designed to be c3%, and the duty cycle of the second pulse 2 can be designed to be b%. Compared with a pulse with a duty cycle of a%, the change in the pulse width of the effective level in a pulse with a duty cycle of c3% is 4H.

[0070] Furthermore, see again Figure 7Since the effective level pulse width in the second pulse 2 is larger, the second pulse 2 can be placed before the first pulse 1. Thus, after the first switching FS of the light emission control signal Emit, the switched light emission control signal Emit will first output the second pulse 2 with a higher duty cycle, thereby increasing the panel brightness faster and optimizing the brightness increase effect.

[0071] When the emission control signal Emit after the first FS switch includes at least two pulses within a frame time F, in another setting method, such as Figure 10 As shown, Figure 10 Another timing diagram of the Emit light emission control signal provided in the embodiment of the present invention is shown. After the first switching FS is executed, the duty cycle of at least two pulses included in the Emit light emission control signal within a frame time F is the same.

[0072] For example, in one configuration, the change in the pulse width of the effective level in a pulse with a duty cycle of b% is 12H compared to a pulse with a duty cycle of a%. After the first switching FS is executed, the duty cycle of the light emission control signal Emit is c1%, and the change in the pulse width of the effective level in a pulse with a duty cycle of c1% is 4H compared to a pulse with a duty cycle of a%. After the second switching FS is executed, the duty cycle of the light emission control signal Emit is c2%, and the change in the pulse width of the effective level in a pulse with a duty cycle of c2% is 8H compared to a pulse with a duty cycle of a%.

[0073] In this configuration, the duty cycle of the pulses included in the Emit control signal after the first FS switching is the same within a frame time F, making the duty cycle design relatively simple.

[0074] In one feasible implementation, see again Figure 3 The number of pulses included in the Emit light emission control signal within one frame time F after the first switching FS is the first number, and the number of pulses included in the Emit light emission control signal within one frame time F during the effective phase ad is the second number. The first number is equal to the second number.

[0075] For example, in conjunction with the foregoing analysis of panel brightness during the execution of the first FS switching, in one setting method, combined with Figure 3 During the effective phase (ad), the emission control signal Emit consists of two pulses within one frame time F, both with a duty cycle of a%. When the panel brightness decays to... At that time, the first switching FS is performed on the Emit control signal. After the first switching FS is performed, the Emit control signal includes two pulses within one frame time F, one pulse has a duty cycle of a%, and the other pulse has a duty cycle of b%. When the brightness of the panel after the increase decays to At that time, the second switching SS is performed on the emission control signal Emit. After the second switching SS is performed, the emission control signal Emit includes two pulses within one frame time F, and the duty cycle of the two pulses is b).

[0076] In this configuration, the number of pulses of the Emit control signal after the first FS switching remains unchanged. The total duration of the effective level within a frame time F can be adjusted to different degrees by adjusting the duty cycle of some or all of the pulses within a frame time F.

[0077] Alternatively, in another feasible implementation, such as Figure 11 As shown, Figure 11 In another timing diagram of the emission control signal Emit provided in this embodiment of the invention, the number of pulses included in the emission control signal Emit within one frame time F after the execution of the first switching FS is a first number, and the number of pulses included in the emission control signal Emit within one frame time F during the effective phase ad is a second number. The first number of the emission control signal Emit after at least one execution of the first switching FS is greater than the second number.

[0078] For example, in conjunction with the foregoing analysis of panel brightness during the execution of the first FS switching, in one setting method, combined with Figure 11 During the effective phase (ad), the emission control signal Emit consists of two pulses within one frame time F, both with a duty cycle of a%, when the panel brightness is [value missing]. At that time, the first switching FS is performed on the Emit control signal. After the first switching FS, the Emit control signal includes three pulses within one frame time F, one of which has a duty cycle of b%, and the other two have a duty cycle of a%. When the brightness of the panel after the increase decays to At that time, the Emit control signal undergoes a second first switching FS. After the second first switching FS, the Emit control signal comprises two pulses within one frame time F, one pulse with a duty cycle of b% and the other with a duty cycle of a%. When the panel brightness decreases after the increase... At that time, the Emit control signal undergoes its third first switching FS. After the third first switching FS, the Emit control signal comprises three pulses within one frame time F, with one pulse having a duty cycle of b% and the other two pulses having a duty cycle of a%. When the panel brightness decreases after the increase... The second switching SS is performed on the emission control signal Emit. After the second switching SS is performed, the emission control signal Emit includes two pulses within one frame time F, and the duty cycle of the two pulses is b%.

[0079] It should be noted that, in this embodiment of the invention, the first quantity of the emission control signal Emit after different executions of the first switching FS can be different. Furthermore, the number of pulses in the emission control signal Emit within one frame can be adjusted by regulating the trigger frequency of the emission control signal Emit.

[0080] It is understandable that the more pulses there are within a frame time F, the more precisely the pulse duty cycle can be controlled to regulate the total duration of the effective level within a frame time F. Therefore, within a frame time F, by designing the number of pulses included in the Emit control signal after at least one execution of the first switching FS to be greater than the number of pulses included in the Emit control signal provided in the effective phase ad, the brightness can be adjusted more precisely.

[0081] Furthermore, in this embodiment of the invention, after performing the second switching SS on the Emit light-emitting control signal, it is possible to select whether to continue performing a third switching, a fourth switching, etc., on the Emit light-emitting control signal based on the actual brightness attenuation. For example, after performing the second switching SS on the Emit light-emitting control signal to increase the panel brightness, a third switching can be performed on the Emit light-emitting control signal before the panel brightness attenuates to the threshold brightness. In this case, the duty cycle of the Emit light-emitting control signal after the third switching can be less than b%, or the third switching can be performed on the Emit light-emitting control signal when the panel brightness attenuates to the threshold brightness. In this case, the duty cycle of the Emit light-emitting control signal after the third switching can be equal to b%.

[0082] In one feasible implementation, such as Figure 12 As shown, Figure 12 This invention provides another timing diagram for the Emit light-emitting control signal. The low-frequency driving mode includes a first mode and a second mode. The first mode has a first data refresh frequency f1, and the second mode has a second data refresh frequency f2. The first data refresh frequency is less than the second data refresh frequency f2; for example, the first data refresh frequency f1 is 15Hz, and the second data refresh frequency f2 is 30Hz. In the first mode, the number of times the first switching FS is performed on the Emit light-emitting control signal is greater than the number of times the first switching FS is performed on the Emit light-emitting control signal in the second mode.

[0083] This method differentiates the number of times the first switching FS is executed under different data refresh frequencies. For the first data refresh frequency f1, which is relatively small, the corresponding data refresh cycle time is longer. At this time, the number of times the first switching FS is executed on the emission control signal Emit can be increased accordingly, so as to make a more gradual and precise adjustment to the brightness at ultra-low frequencies.

[0084] In one feasible implementation, such as Figure 13 As shown, Figure 13 This is a schematic diagram of a pixel circuit provided in an embodiment of the present invention. The pixel circuit 3 includes a driving transistor M0, a first transistor M1, and a storage capacitor C, wherein the first transistor M1 and the storage capacitor C are electrically connected to the gate of the driving transistor M0.

[0085] The driving method also includes: determining whether the following conditions are met: If yes, do not perform the first switching FS on the Emit control signal; otherwise, perform the first switching FS on the Emit control signal, where V N1 The voltage at the gate of the driving transistor M0 after charging during the effective phase ad is given, where k is a standard coefficient, and I is the voltage at the gate. off To drive the off-state leakage current of transistor M0, W and L are the channel width and channel length of the first transistor M1, respectively, Cst is the capacitance value of the storage capacitor C, and f r This refers to the data refresh frequency in low-frequency drive mode.

[0086] Among them, combined Figure 13 The first transistor M1 can be either a gate reset transistor M11 or a compensation transistor M12. Figure 13 This illustration uses the example of the first transistor M1 being the gate reset transistor M11. When the first transistor M1 is the gate reset transistor M11, W and L in the formula are the width and length of the channel of the gate reset transistor M11, respectively. When the first transistor M1 is the compensation transistor M12, W and L in the formula are the width and length of the channel of the compensation transistor M12, respectively.

[0087] In one setup method, see Figure 13 The gate reset transistor M11 and the compensation transistor M12 can be dual-gate transistors. That is, the gate reset transistor M11 includes a first sub-gate reset transistor M11_1 and a second sub-gate reset transistor M11_2, and the compensation transistor M12 includes a first sub-compensation transistor M12_1 and a second compensation transistor M12_2.

[0088] Based on this structure, when the first transistor M1 is the gate reset transistor M11, as follows: Figure 14 As shown, Figure 14This is a schematic diagram of a first transistor M1 provided in an embodiment of the present invention. The channel length L of the first transistor M1 (that is, the channel length of the gate reset transistor M11) is equal to the sum of the channel length l1 of the first sub-gate reset transistor M11_1 and the channel length l2 of the second sub-gate reset transistor M11_2. The channel width W of the first transistor M1 (that is, the channel width of the gate reset transistor M11) is equal to the channel length w1 of the first sub-gate reset transistor M11_1 or the channel length w2 of the second sub-gate reset transistor M11_2. Generally, the channel length w1 of the first sub-gate reset transistor M11_1 and the channel length w2 of the second sub-gate reset transistor M11_2 are equal. However, when they are not equal, the channel width W of the first transistor M1 can be equal to the channel width of the sub-gate reset transistor closer to the first node N1, where the first node N1 is the connection node between the gate reset transistor M11 and the driving transistor M0. For example, see [link to example]. Figure 14 When the second sub-gate reset transistor M11_2 is closer to the first node N1, the channel width W of the first transistor M1 is equal to the channel length w2 of the second sub-gate reset transistor M11_2.

[0089] When the first transistor M1 is the compensation transistor M12, as follows Figure 15 As shown, Figure 15 This is another schematic diagram of the structure of the first transistor M1 provided in an embodiment of the present invention. The channel length L of the first transistor M1 (that is, the channel length of the compensation transistor M12) is equal to the sum of the channel length l3 of the first sub-compensation transistor M12_1 and the channel length l4 of the second sub-compensation transistor M12_2. The channel width W of the first transistor M1 (that is, the channel width of the compensation transistor M12) is equal to the channel length w3 of the first sub-compensation transistor M12_1 or the channel length w4 of the second sub-compensation transistor M12_2. Generally, the channel length w3 of the first sub-compensation transistor M12_1 and the channel length w4 of the second sub-compensation transistor M12_2 are equal. However, when they are not equal, the channel width W of the first transistor M1 can be equal to the channel width of the sub-compensation transistor closer to the first node N1. For example, see [link to example diagram]. Figure 15 When the second sub-compensation transistor M12_2 is closer to the first node N1, the channel width W of the first transistor M1 is equal to the channel length w4 of the second sub-compensation transistor M12_2.

[0090] k can be measured under a fixed brightness by substituting predetermined parameters, including parameters related to the first transistor M1, such as process parameters related to the gate reset transistor M11 or the compensation transistor M12. When the capacitance value Cst of the storage capacitor C is in fF, the off-state leakage current I of the driving transistor M0... off The unit is amperes (A), and the voltage V at the gate of the driving transistor M0 after charging is...N1 When the unit is V, the order of magnitude of k can be 1e12, for example, the range of k can be 2×e 12 ~10×e 12 The aforementioned fixed brightness can be understood as a critical brightness. When the panel brightness is less than the fixed brightness, the impact of leakage current on brightness is negligible (for example, the impact is not visible to the human eye). When the panel brightness reaches the fixed brightness, the impact of leakage current on brightness begins to appear.

[0091] It is understandable that the circuit structure of the pixel circuit will affect the leakage current intensity of the gate of the driving transistor M0 during the holding phase, thereby affecting the change in light emission brightness. Therefore, in this embodiment of the invention, the adjustment of the light emission control signal Emit is also combined with the circuit design of the pixel circuit.

[0092] When it is determined that the following conditions are met: When the driving transistor M0 is charged, its gate voltage is relatively high, meaning the driving current converted by the driving transistor M0 is relatively low, and the panel brightness is very low. For example, the display panel may be in a very low brightness level. In this case, the brightness jump caused by leakage is insufficient to be perceived by the human eye, so the first switching FS of the emission control signal Emit can be omitted to save power consumption.

[0093] It should be noted that the above judgment process is based on the knowledge of V. N1 Then it can be executed. In this embodiment of the invention, the above-mentioned judgment process can be performed before the holding phase kd. For example, the valid phase ad includes a reset period, a charging period, and a light emission control period. The charging operation on the gate of the driving transistor M0 occurs during the charging period. In this embodiment of the invention, the above-mentioned judgment process can be performed during the light emission control period in the valid phase ad, so as to determine whether the first switching FS needs to be performed on the light emission control signal Emit in the holding phase kd before entering the holding phase kd, thereby avoiding delaying the timing of performing the first switching FS.

[0094] Furthermore, in determining The driving method also includes: determining whether the following conditions are met: If so, when performing the first switching FS on the Emit control signal, ensure that the number of pulses in the Emit control signal within one frame time F after at least one execution of the first switching FS is greater than the number of pulses in the Emit control signal within one frame time F provided in the effective phase ad; determine whether the following conditions are met: If so, when performing the first switching FS on the Emit control signal, the number of pulses in the Emit control signal after performing the first switching FS within one frame time F is equal to the number of pulses in the Emit control signal provided in the effective phase ad within one frame time F.

[0095] When satisfied When the driving transistor M0 is charged, its gate voltage is slightly lower, and the current converted by the driving transistor M0 is slightly higher. This results in a smaller impact of leakage current on brightness, and a smaller decrease in brightness. At this time, by increasing the number of pulses in the Emit control signal within one frame time F after executing the first switching FS, the brightness can be adjusted more precisely, allowing the panel brightness to be better boosted to the initial brightness level.

[0096] And when the condition is satisfied When the driving transistor M0 is charged, its gate voltage is relatively small, the driving current converted by the driving transistor M0 is relatively large, and the leakage current has a significant impact on the brightness. At this time, there is no need to make too precise control over the brightness. Therefore, the number of pulses of the light emission control signal Emit within one frame time F after the first switching FS is not changed, reducing the difficulty of control.

[0097] See Figure 13 The pixel circuit 2 may also include a data writing transistor M2, an anode reset transistor M3, a first light-emitting control transistor M4, and a second light-emitting control transistor M5.

[0098] The gate reset transistor M11 includes a first sub-gate reset transistor M11_1 and a second sub-gate reset transistor M11_2. The gate of the first sub-gate reset transistor M11_1 and the gate of the second sub-gate reset transistor M11_2 are electrically connected to the first scan signal line Scan1, respectively. The first terminal of the first sub-gate reset transistor M11_1 is electrically connected to the reset signal line Vref. The second terminal of the first sub-gate reset transistor M11_1 is electrically connected to the first terminal of the second sub-gate reset transistor M11_2. The second terminal of the second sub-gate reset transistor M11_2 is electrically connected to the gate of the driving transistor M0.

[0099] The gate of the data writing transistor M2 is electrically connected to the second scan signal line Scan2, the first terminal of the data writing transistor M2 is electrically connected to the data line Data, and the second terminal of the data writing transistor M2 is electrically connected to the first terminal of the driving transistor M0.

[0100] The compensation transistor M12 includes a first sub-compensation transistor M12_1 and a second sub-compensation transistor M12_2. The gates of the first sub-compensation transistor M12_1 and the second sub-compensation transistor M12_2 are electrically connected to the second scan signal line Scan2, respectively. The first terminal of the first sub-compensation transistor M12_1 is electrically connected to the second terminal of the driving transistor M0. The second terminal of the first sub-compensation transistor M12_1 is electrically connected to the first terminal of the second sub-compensation transistor M12_2. The second terminal of the second sub-compensation transistor M12_2 is electrically connected to the gate of the driving transistor M0.

[0101] The gate of the anode reset transistor M3 is electrically connected to the second scan signal line Scan2, the first terminal of the anode reset transistor M3 is electrically connected to the reset signal line Vref, and the second terminal of the anode reset transistor M3 is electrically connected to the anode of the light-emitting element 4.

[0102] The gate of the first light-emitting control transistor M4 is electrically connected to the light-emitting control signal line Emit, the first terminal of the first light-emitting control transistor M4 is electrically connected to the power supply line PVDD, and the second terminal of the first light-emitting control transistor M4 is electrically connected to the first terminal of the driving transistor M0.

[0103] The gate of the second light-emitting control transistor M5 is electrically connected to the light-emitting control signal line Emit. The first terminal of the second light-emitting control transistor M5 is electrically connected to the second terminal of the driving transistor M0. The second terminal of the second light-emitting control transistor M5 is electrically connected to the anode of the light-emitting element 4 and the storage capacitor C.

[0104] The working principle of this pixel circuit is the same as that of existing technology, and will not be described in detail here.

[0105] Based on the same inventive concept, embodiments of the present invention provide a display device for applying the above-described driving method. (In conjunction with...) Figure 3 ,like Figure 16 As shown, Figure 16 This is a schematic diagram of a display device provided in an embodiment of the present invention. The display device may specifically include a display panel 100 and a driving structure 200, and the driving structure 200 may specifically include a driving chip.

[0106] Among them, the display panel 100 has a low-frequency drive mode, in which a holding stage kd is inserted between the two effective stages ad.

[0107] The driving structure 200 is used to provide a light emission control signal Emit with a duty cycle of a% to the pixel circuit during the effective phase ad in low-frequency driving mode, and to perform a first switching FS and a second switching SS on the light emission control signal Emit during the holding phase kd. The duty cycle is the proportion of the effective level in the light emission control signal Emit to the pulse width. The first switching FS occurs before the second switching SS. The panel brightness during the execution of the first switching FS is greater than the panel brightness during the execution of the second switching SS. The duty cycle of the light emission control signal Emit after the execution of the second switching SS is b%, where b > a. The total effective level duration of the light emission control signal Emit within one frame time F after the execution of the first switching FS is between the total effective level durations of the light emission control signal Emit with duty cycles of a% and b% within one frame time F.

[0108] Based on the foregoing analysis, the display device provided in this embodiment of the invention can perform a first switching FS with a small effective level adjustment on the Emit light emission control signal before the panel brightness decays to the threshold brightness. This allows for multiple gradual and gentle increases in brightness within the data refresh cycle, resulting in a more uniform overall brightness adjustment and effectively mitigating flickering caused by brightness fluctuations.

[0109] Furthermore, the panel brightness during the first FS switch is the first brightness, and the panel brightness during the second SS switch is the second brightness. For example... Figure 17 As shown, Figure 17 This is another schematic diagram of the display device provided in an embodiment of the present invention. The display device further includes a trigger structure 300, which is electrically connected to the driving structure 200. The trigger structure 300 is used to issue a first trigger command at a first time point to control the driving structure 200 to perform a first switching FS on the light emission control signal Emit, and to issue a second trigger command at a second time point to control the driving structure 200 to perform a second switching SS on the light emission control signal Emit. The first trigger command includes first brightness information and first time point information, and the first trigger command includes second brightness information and second time point information.

[0110] Based on the foregoing analysis, by setting the trigger structure 300, the brightness of the display panel 100 can be tested before it leaves the factory to determine the timing of each first switch (FS) and second switch (SS). Thus, after the display panel 100 is put into use, based on the recorded timing points, the corresponding trigger command can be issued directly when the timing point arrives, controlling the corresponding switching operation of the light emission control signal Emit. There is no need to monitor the panel brightness in real time during the display process to determine brightness decay, making the adjustment method much simpler.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A driving method for a display panel, characterized in that, The display panel has a low-frequency drive mode in which a hold phase is inserted between two active phases. The driving method includes: in the low-frequency driving mode, providing a light emission control signal with a duty cycle of a% to the pixel circuit during the effective phase, wherein the duty cycle is the proportion of the effective level in the light emission control signal to the pulse width, and performing a first switching and a second switching on the light emission control signal during the holding phase; Wherein, the first switching is performed before the second switching, the panel brightness when the first switching is performed is greater than the panel brightness when the second switching is performed, the duty cycle of the light emission control signal after the second switching is b%, b > a, and the total effective level duration of the light emission control signal after the first switching is between the total effective level duration of the light emission control signal with a duty cycle of a% and the total effective level duration of the light emission control signal with a duty cycle of b% within one frame. The low-frequency drive mode includes a first mode and a second mode. The first mode has a first data refresh frequency, and the second mode has a second data refresh frequency. The first data refresh frequency is less than the second data refresh frequency. In the first mode, the number of times the first switching of the light emission control signal is performed is greater than the number of times the first switching of the light emission control signal is performed in the second mode.

2. The driving method according to claim 1, characterized in that, The number of times the first switch is performed is x, where x > 1; Specifically, the panel brightness during the i-th first switch is greater than the panel brightness during the (i+1)-th first switch, and the total effective level duration of the light emission control signal within one frame after the i-th first switch is less than the total effective level duration of the light emission control signal within one frame after the (i+1)-th first switch.

3. The driving method according to claim 2, characterized in that, x≥3, wherein the brightness difference between the panel brightness during two consecutive executions of the first switch is equal.

4. The driving method according to claim 1, characterized in that, The panel brightness during the second switching is , where f c f is half the clock frequency corresponding to the light emission control signal. r L represents the data refresh rate in the low-frequency drive mode, and L represents the initial brightness of the panel. The panel brightness during the first switch is less than .

5. The driving method according to claim 4, characterized in that, The first switching is performed 1 time, wherein the panel brightness during the first switching is [value missing]. .

6. The driving method according to claim 4, characterized in that, The number of times the first switch is executed is x, where x ≥ 3, and the panel brightness at the i-th time the first switch is... n i <m, i takes values ​​1, ..., x in sequence, where n1 < n2 < ... < n x And, n x -n x-1 =n x-1 -n x-2 =…=n2-n1.

7. The driving method according to claim 1, characterized in that, The driving method further includes: The panel brightness during the first switch is the first brightness, and the panel brightness during the second switch is the second brightness; At a first time point, a first trigger command is invoked to perform the first switching on the light emission control signal, and at a second time point, a second trigger command is invoked to perform the second switching on the light emission control signal. The first trigger command includes first brightness information and first time point information, and the first trigger command includes second brightness information and second time point information.

8. The driving method according to claim 1, characterized in that, During the effective phase, the light emission control signal includes at least two pulses within one frame. During the hold phase, the light emission control signal after performing the first switch and the second switch includes at least two pulses within one frame.

9. The driving method according to claim 8, characterized in that, The light emission control signal after the first switching is executed includes a first pulse and a second pulse within one frame, wherein the duty cycle of the second pulse is greater than that of the first pulse.

10. The driving method according to claim 9, characterized in that, The duty cycle of the first pulse is a%, and the duty cycle of the second pulse is b%.

11. The driving method according to claim 9, characterized in that, The second pulse precedes the first pulse.

12. The driving method according to claim 8, characterized in that, After the first switching is performed, the duty cycle of at least two pulses of the light emission control signal is the same within one frame.

13. The driving method according to claim 1, characterized in that, The number of pulses included in the light emission control signal after the first switch within one frame time is the first number, and the number of pulses included in the light emission control signal within one frame time in the effective phase is the second number; The first quantity is equal to the second quantity.

14. The driving method according to claim 1, characterized in that, The number of pulses included in the light emission control signal after the first switch within one frame time is the first number, and the number of pulses included in the light emission control signal within one frame time in the effective phase is the second number; The first quantity of the light emission control signal after the first switch is greater than the second quantity at least once.

15. The driving method according to claim 1, characterized in that, The pixel circuit includes a driving transistor, a first transistor, and a storage capacitor, wherein the first transistor and the storage capacitor are electrically connected to the gate of the driving transistor. The driving method further includes: Determine if the following conditions are met: If yes, the first switching is not performed on the light emission control signal; if no, the first switching is performed on the light emission control signal, wherein... The voltage at the gate of the driving transistor after charging it during the effective phase, where k is a standard coefficient. The current is the off-state leakage current of the driving transistor, where W and L are the channel width and channel length of the first transistor, respectively. f is the capacitance value of the storage capacitor. r This refers to the data refresh frequency in the low-frequency drive mode.

16. The driving method according to claim 15, characterized in that, Determine At the same time, the driving method also includes: Determine if the following conditions are met: If so, when performing the first switching on the light emission control signal, the number of pulses in the light emission control signal after at least one first switching is greater than the number of pulses in the light emission control signal in the effective phase within one frame. Determine if the following conditions are met: If so, when performing the first switching on the light emission control signal, the number of pulses in the light emission control signal after performing the first switching within one frame time is equal to the number of pulses in the light emission control signal within one frame time during the effective phase.

17. A display device, characterized in that, For applying the driving method as described in claim 1, including: The display panel has a low-frequency drive mode, in which a holding phase is inserted between two effective phases; A driving structure is configured to provide a light emission control signal with a duty cycle of a% to the pixel circuit during the effective phase in the low-frequency driving mode, wherein the duty cycle is the proportion of the effective level in the light emission control signal to the pulse width, and to perform a first switching and a second switching on the light emission control signal during the holding phase. Wherein, the first switching is performed before the second switching, the panel brightness when the first switching is performed is greater than the panel brightness when the second switching is performed, the duty cycle of the light emission control signal after the second switching is b%, b > a, and the total effective level duration of the light emission control signal after the first switching is between the total effective level duration of the light emission control signal with a duty cycle of a% and the total effective level duration of the light emission control signal with a duty cycle of b% within one frame. The low-frequency drive mode includes a first mode and a second mode. The first mode has a first data refresh frequency, and the second mode has a second data refresh frequency. The first data refresh frequency is less than the second data refresh frequency. In the first mode, the number of times the first switching of the light emission control signal is performed is greater than the number of times the first switching of the light emission control signal is performed in the second mode.

18. The display device according to claim 17, characterized in that, The panel brightness during the first switch is the first brightness, and the panel brightness during the second switch is the second brightness; The display device further includes a trigger structure electrically connected to the driving structure. The trigger structure is used to issue a first trigger command at a first time point to control the driving structure to perform the first switching of the light emission control signal, and to issue a second trigger command at a second time point to control the driving structure to perform the second switching of the light emission control signal. The first trigger command includes first brightness information and first time point information, and the first trigger command includes second brightness information and second time point information.

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