Driving method of display panel, display panel and display device

Abstract

Embodiments of the present application provide a display panel driving method, a display panel and a display device, and relate to the display field. In the low-frequency driving process, the influence of the display caused by the ghosting problem can be effectively weakened when the picture is switched. The driving method comprises: in the first mode, the driving process of the display panel comprises a first stage, a second stage and a third stage; in the first stage, a first picture is displayed at a first frequency, in the second stage, the first picture is displayed at a frequency greater than the first frequency in at least part of the time period adjacent to the first stage, and in the third stage, a second picture is displayed at the first frequency.

Description

[Technical Field]

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

[0002] During low-frequency driving, if a new image needs to be displayed, the display panel's driving frequency is typically switched from a low frequency to a higher frequency to achieve a smoother dynamic display effect. Simultaneously, the data voltage written to the panel is adjusted to the data voltage corresponding to the image to be switched, thus utilizing the high frequency to complete the image switching. After the image switching is complete, the driving frequency is restored to the original low frequency to continue low-frequency display.

[0003] However, during the aforementioned screen switching process, when the drive frequency jumps from low to high, it can cause noticeable ghosting and afterimages, thus affecting the display effect. [Summary of the Invention]

[0004] In view of this, embodiments of the present invention provide a driving method for a display panel, a display panel, and a display device, which can effectively reduce the impact of ghosting on the display when switching screens during low-frequency driving.

[0005] This invention provides a driving method. In a first mode, the driving process of the display panel includes a first stage, a second stage, and a third stage. In the first stage, the first image is displayed at a first frequency. In the second stage, for at least a portion of the time period adjacent to the first stage, the first image is displayed at a frequency greater than the first frequency. In the third stage, the second image is displayed at the first frequency.

[0006] Based on the same inventive concept, embodiments of the present invention also provide a display panel that is driven by the above-described driving method.

[0007] Based on the same inventive concept, embodiments of the present invention also provide a display device, including the above-described display panel.

[0008] One of the above technical solutions has the following beneficial effects:

[0009] Using the driving method provided in this embodiment of the invention, when switching from the first screen to the second screen, the operation of first switching the high frequency and then switching the screen is performed. In the first stage, the first screen is normally displayed at a lower first frequency. When switching to the second screen, at the first moment, only the driving frequency is switched from a low frequency to a higher frequency. At this time, the data voltage written to the panel is not changed, so the display panel still displays the first screen. After the frequency is switched to high for a period of time, the data voltage corresponding to the second screen is written, completing the switch to the second screen. Thus, when the driving frequency switches from low to high, the last frame before the switch (i.e., the last frame displayed in the first stage) and the first frame after the switch (i.e., the first frame displayed in the second stage) are the same, both being the first screen. Even if a ghosting problem occurs due to the high frequency switch, because the ghosted image is the same as the currently normally displayed image, the ghosting problem is not easily perceived by the human eye, greatly reducing the risk of the ghosting phenomenon being visible to the human eye and effectively weakening the impact of the ghosting phenomenon on the display effect. [Attached Image Description]

[0010] 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.

[0011] Figure 1 This is a schematic diagram illustrating the working process of a display panel in related technologies;

[0012] Figure 2 This is a schematic diagram illustrating the working process of a display panel provided in an embodiment of the present invention;

[0013] Figure 3 This is a schematic diagram illustrating another working process of the display panel provided in an embodiment of the present invention;

[0014] Figure 4 This is a schematic diagram of a driving cycle of a display panel at different frequencies provided in an embodiment of the present invention.

[0015] Figure 5 This is a schematic diagram of another driving cycle of the display panel at different frequencies provided in an embodiment of the present invention.

[0016] Figure 6 This is a schematic diagram illustrating another working process of the display panel provided in an embodiment of the present invention;

[0017] Figure 7 This is a schematic diagram illustrating another working process of the display panel provided in an embodiment of the present invention;

[0018] Figure 8 This is a schematic diagram illustrating another working process of the display panel provided in an embodiment of the present invention;

[0019] Figure 9 This is a schematic diagram of a pixel circuit structure provided in an embodiment of the present invention;

[0020] Figure 10 To and Figure 4 A corresponding timing diagram;

[0021] Figure 11 To and Figure 5 A corresponding timing diagram;

[0022] Figure 12 This is a schematic diagram illustrating another working process of the display panel provided in an embodiment of the present invention;

[0023] Figure 13 This is a schematic diagram illustrating another working process of the display panel provided in an embodiment of the present invention;

[0024] Figure 14 This is a schematic diagram illustrating another working process of the display panel provided in an embodiment of the present invention;

[0025] Figure 15 This is a schematic diagram illustrating another working process of the display panel provided in an embodiment of the present invention;

[0026] Figure 16 This is a schematic diagram of a display panel provided in an embodiment of the present invention;

[0027] Figure 17 This is a schematic diagram of a display device provided in an embodiment of the present invention.

Detailed Implementation Methods

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] As described in the background section, during low-frequency driving, if a new image needs to be displayed, in order to achieve a smoother dynamic display effect, the driving frequency of the display panel is usually switched from a low frequency to a higher frequency. At the same time, the data voltage written to the panel is adjusted to the data voltage corresponding to the image to be switched, thereby using the high frequency to complete the image switching. After the image switching is completed, the driving frequency is restored to the original low frequency to continue low-frequency display.

[0033] like Figure 1 As shown, Figure 1 This is a schematic diagram illustrating the operation of a display panel in related technologies. During low-frequency display, the display panel displays a first image at frequency f1', where f1' is the lower frequency corresponding to the current low-frequency mode. When it is necessary to start displaying a second image, at a first moment t1', the driving frequency is switched from frequency f1' to a higher frequency f2', and the data voltage corresponding to the second image is written to the display panel. After the image switching is complete, at a second moment t2', the driving frequency is restored to the original frequency f1' to continue normal low-frequency display.

[0034] in, Figure 1 The dashed line L in the image represents the actual brightness. Figure 1 The bold arrow below the horizontal axis indicates the moment when the data voltage corresponding to the second screen begins to be written to the panel.

[0035] In one application scenario, the display panel displays the time information infrequently. For example, when it is necessary to switch from the "12:00" time display to the "12:01" time display, the above operation is performed.

[0036] However, during this screen switching process, when the driving frequency switches from low to high, the hysteresis effect of the driving transistor and other factors will cause obvious ghosting in the screen, which will have an adverse effect on the display effect.

[0037] Therefore, this invention provides a driving method for a display panel. During low-frequency driving, when screen switching is required, this driving method can effectively mitigate the adverse effects of motion blur caused by switching from low to high driving frequency on the display effect.

[0038] The display panel has a first mode, which is a low-frequency display mode. For example... Figure 2As shown, Figure 2 This is a schematic diagram illustrating the working process of a display panel provided in an embodiment of the present invention. In a first mode, the driving process of the display panel includes a first stage A1, a second stage B, and a third stage A2. In the first stage A1, the display panel displays a first image at a first frequency f1, which can be understood as a lower frequency corresponding to the low-frequency display mode, such as 10Hz, 15Hz, 20Hz, etc. In the second stage B, for at least a portion of the time period adjacent to the first stage A1, the first image is displayed at a frequency greater than the first frequency f1. In the third stage A2, a second image is displayed at the first frequency f1. That is, the first stage A1 and the second stage A2 can be understood as normal low-frequency display periods, and the second stage B in between can be understood as a high-frequency display period that is briefly jumped to when a screen switching is required.

[0039] Combination Figure 1 Based on the aforementioned analysis of the relevant technologies, when switching from the first screen to the second screen, the operation of switching high frequency and switching screen is performed simultaneously at the first moment t1'. At this time, the first screen is displayed in the previous frame and the second screen is displayed in the next frame. Therefore, when the image appears due to the high frequency switching, the image of the first screen appears on the second screen, which makes the image easily recognizable by the human eye.

[0040] The driving method provided in this embodiment of the invention performs a process of switching from the first screen to the second screen by first switching the high-frequency signal and then switching the screen itself. Combined with... Figure 2 In the first stage, A1 displays the first screen normally at a lower first frequency f1. When it is necessary to switch to the second screen, at the first moment t1, the driving frequency is only switched from a low frequency to a higher frequency (in... Figure 2 The higher frequency (f2) does not change the data voltage written to the panel, allowing the display panel to still show the first image. After the frequency is switched to higher for a period of time, the data voltage corresponding to the second image is written, completing the switch to the second image. In this way, when the driving frequency is switched from low to high, the last frame before the switch (that is, the last frame displayed in the first stage A1) and the first frame after the switch (that is, the first frame displayed in the second stage B) are the same, both being the first image. Even if a ghosting problem occurs due to the frequency switch, the ghosting image is the same as the currently displayed image, so the ghosting problem is not easily perceived by the human eye, greatly reducing the risk of the ghosting phenomenon being visible to the human eye and effectively weakening the impact of the ghosting phenomenon on the display effect.

[0041] In one feasible implementation, see again Figure 2The second stage B includes a first sub-stage B1 and a second sub-stage B2. In the first sub-stage B1, the first image is displayed at a frequency higher than the first frequency f1. In the second sub-stage B2, the second image is displayed at a frequency higher than the first frequency f1. This achieves image switching at a higher frequency than the first frequency f1, meaning the image switching is completed within a short, high-frequency display period, resulting in a smoother dynamic switching effect. Moreover, under this driving method, only the frequency condition needs to be switched when entering the second stage B from the first stage A1, and only the image condition needs to be switched when entering the third stage A2 from the second stage B, avoiding significant display problems caused by switching multiple conditions simultaneously.

[0042] In the accompanying drawings of this invention, the position indicated by the bold arrow below the horizontal axis is the moment when the data voltage corresponding to the second screen begins to be written to the panel.

[0043] Furthermore, see again Figure 2 The frequency of the second sub-stage B2 is lower than the frequency of the first sub-stage B1. In one configuration, the first and second sub-stages are displayed at constant frequencies, with the first sub-stage B1 having a second frequency f2 and the second sub-stage B2 having a third frequency f3.

[0044] For example, the first frequency f1 is 15Hz, the second frequency f2 is 60Hz, and the third frequency f3 is 45Hz. Combined with... Figure 2 In the first stage A1, the display panel displays the first image at 15Hz. When the second image needs to be displayed, at the first moment t1, the drive frequency of the display panel is switched to 60Hz to display the first image at 60Hz in the first sub-stage B1. Then, at the second moment t2, the drive frequency of the display panel is switched to 45Hz, and the data voltage corresponding to the second image is written to the panel to display the second image at 45Hz in the second sub-stage B2. Then, at the third moment t3, the drive frequency of the display panel is switched to 15Hz to display the second image at 15Hz, thus restoring normal low-frequency drive.

[0045] At this point, the second sub-stage B2 can be regarded as the frequency transition stage between the first sub-stage B1 and the third stage A2, realizing the gradient transition of frequency and avoiding the direct jump from a very high frequency to a very low frequency when the second stage B enters the third stage A2, thereby avoiding the adverse effects that may be caused by excessive frequency jump.

[0046] Furthermore, the difference between the frequency of the second sub-stage B2 and the frequency of the first sub-stage B1 is the first difference value, and the difference between the frequency of the second sub-stage B2 and the first frequency f1 is the second difference value. To achieve a smoother frequency transition between the first, second, and third sub-stages, the first difference value can be set to be equal to the second difference value, i.e., f2 - f3 = f3 - f1. For example, the first frequency f1 is 15Hz, the second frequency f2 is 75Hz, and the third frequency f3 is 45Hz.

[0047] Or, such as Figure 3 As shown, Figure 3 This is a schematic diagram of another working process of the display panel provided in an embodiment of the present invention, wherein the first sub-stage B1 and the second sub-stage B2 have the same frequency. In one configuration, the first sub-stage and the second sub-stage are displayed at a constant frequency, and the first sub-stage B1 and the second sub-stage B2 each have a second frequency f2.

[0048] For example, the first frequency f1 is 15Hz, and the second frequency f2 is 60Hz. Combined with... Figure 3 In the first stage A1, the display panel displays the first image at 15Hz. When the second image needs to be displayed, at the first moment t1, the drive frequency of the display panel is switched to 60Hz to display the first image at 60Hz in the first sub-stage B1. Then, at the second moment t2, the data voltage corresponding to the second image is written to the display panel to display the second image at 60Hz in the second sub-stage B2. Then, at the third moment t3, the drive frequency of the display panel is switched back to 15Hz to display the second image at a low frequency of 15Hz, thus restoring the normal low-frequency drive.

[0049] In this method, the entire second stage B is driven at a constant frequency. This simplifies frequency settings within the second stage B and allows for a simpler transition from the first sub-stage B1 to the second sub-stage B2, requiring only a screen switch rather than a frequency switch, thus avoiding significant display issues caused by simultaneous switching of multiple conditions. Furthermore, the overall duration of the second stage B is shorter in this method, contributing to power savings.

[0050] Furthermore, the inventors discovered during their research that the brightness of the same image varies at different frequencies. The following illustration uses the second sub-stage B2 and the third stage A2 as examples to illustrate this.

[0051] The third stage A2 has a first frequency f1, and the second sub-stage B2 has a frequency greater than the first frequency f1, such as the second frequency f2 or the third frequency f3. Therefore, although both display the same second screen, their driving frequencies are not the same.

[0052] In one scenario, low frequencies are achieved through frame interpolation. For example... Figure 4 As shown, Figure 4 This is a schematic diagram of a driving cycle of a display panel at different frequencies provided in an embodiment of the present invention. The display panel has a first driving cycle T1 at a first frequency f1, which includes a write frame F1 and a hold frame F2. The display panel has a second driving cycle T2 at a frequency f (which can be a second frequency f2 or a third frequency f3) of the second sub-stage B2, which includes at least a write frame F1. The second driving cycle T2 may or may not include a hold frame F2, but the number of hold frames F2 included is less than the number of hold frames F2 included in the first driving cycle T1.

[0053] Because the pixel circuit only performs data refresh operations within the write frame F1 and not within the hold frame F2, the gate potential of the driving transistor refreshes more frequently at the frequency f of the second sub-stage B2, while it refreshes more slowly at the first frequency f1. This causes a significant shift in the threshold voltage of the driving transistor at the first frequency f1, resulting in a higher screen brightness at the first frequency f1. Furthermore, because the pixel circuit only performs data refresh operations within the write frame F1, the charging level of the driving transistor is the same in both the first driving cycle T1 and the second driving cycle T2. However, the first driving cycle T1 has a longer hold time, leading to a longer leakage time, which pulls down the gate potential of the driving transistor, resulting in a higher screen brightness at the first frequency f1.

[0054] In the accompanying drawings of this invention, the dashed line L represents the actual brightness. See also... Figure 3 When transitioning from the second sub-stage B2 to the third stage A2, an upward brightness fluctuation occurs due to a frequency drop.

[0055] Alternatively, in another scenario, low frequencies can also be achieved without frame interpolation. For example... Figure 5 As shown, Figure 5 This is a schematic diagram of another driving cycle of the display panel at different frequencies provided in the embodiment of the present invention. The display panel has a first driving cycle T1 at a first frequency f1 and a second driving cycle T2 at a frequency f (which can be a second frequency f2 or a third frequency f3) of the second sub-stage B2. The first driving cycle T1 and the second driving cycle T2 respectively include a reset period p1, a charging period p2 and a light emission period p3. The duration of the charging period p2 in the second driving cycle T2 is longer than the duration of the charging period p2 in the first driving cycle T1.

[0056] Because the charging time of the driving transistor in the second driving cycle T2 is relatively short, the driving transistor will not be fully charged, resulting in a low gate potential. Consequently, the screen brightness at frequency f in the second sub-stage B2 will be slightly higher. Thus, when transitioning from the second sub-stage B2 to the third stage A2, a downward brightness fluctuation will occur.

[0057] In summary, the brightness of the same image varies at different frequencies, and at least when the second sub-stage B2 enters the third stage A2, brightness flickering will occur.

[0058] Therefore, in one feasible implementation of this invention, different gamma curves can be set for the first frequency f1 and the frequency f of the second sub-stage B2.

[0059] Specifically, the display panel displays data based on a mapping relationship constructed from grayscale values ​​and data voltages. The first frequency f1 and the frequency f of the second sub-stage B2 correspond to different mapping relationships, and the same grayscale value corresponds to different data voltages in different mapping relationships.

[0060] For the same grayscale value, by making the first frequency f1 and the frequency f of the second sub-stage B2 correspond to different data voltages, the brightness of the screen at the two frequencies can be adjusted as needed to reduce the brightness difference of the second screen displayed at the two frequencies. Then, when entering the third stage A2 from the second sub-stage B2, brightness flicker can be effectively avoided.

[0061] For example, such as Figure 6 As shown, Figure 6 This is a schematic diagram illustrating another working process of the display panel provided in an embodiment of the present invention. Both the first sub-stage B1 and the second sub-stage B2 have a second frequency f2. By setting different mapping relationships for the first frequency f1 and the second frequency f2, not only can the brightness of the second sub-stage B2 and the third stage A2 be made more consistent when displaying the second image, but the brightness of the first stage A1 and the first sub-stage B1 when displaying the first image can also be made more consistent. This avoids flickering when the first stage A1 enters the first sub-stage B1 and when the second sub-stage B2 enters the third stage A2.

[0062] Or, such as Figure 7 As shown, Figure 7 This is a schematic diagram of another working process of the display panel provided in an embodiment of the present invention. The first sub-stage B1 has a second frequency f2, and the second sub-stage B2 has a third frequency f3. By setting different mapping relationships for the first frequency f1 and the third frequency f3, not only can the brightness of the second sub-stage B2 and the third stage A2 be made more consistent when displaying the second image, but also flickering can be avoided when the second sub-stage B2 enters the third stage A2.

[0063] Furthermore, such as Figure 8 As shown, Figure 8 This is a schematic diagram of another working process of the display panel provided in the embodiment of the present invention. Different mapping relationships can also be set for the first frequency f1 and the second frequency f2 so that the screen brightness of the first stage A1 and the first sub-stage B1 when displaying the first screen is also consistent, thereby avoiding flickering when the first stage A1 enters the first sub-stage B1.

[0064] More specifically, when the low frequency is implemented using the above frame interpolation method, for the same grayscale value, the corresponding data voltage in the mapping relationship corresponding to the first frequency f1 can be set higher. That is, for the same grayscale value, the data voltage corresponding to the mapping relationship corresponding to the first frequency f1 is greater than the data voltage corresponding to the mapping relationship corresponding to the frequency f in the second sub-stage B2, thereby reducing the image brightness at the first frequency f1 and making it more consistent with the image brightness at the frequency of the second sub-stage B2.

[0065] Alternatively, when the low frequency is implemented using the aforementioned non-frame interpolation method, for the same grayscale value, the corresponding data voltage in the mapping relationship corresponding to the first frequency f1 can be set lower. That is, for the same grayscale value, the data voltage corresponding to the mapping relationship corresponding to the first frequency f1 is less than the data voltage corresponding to the mapping relationship corresponding to the frequency of the second sub-stage B2, thereby increasing the image brightness at the first frequency f1 and making it more consistent with the image brightness at the frequency of the second sub-stage B2.

[0066] In another feasible implementation of this invention, different duty cycles can be set for the light emission control signal based on the frequency f of the first frequency f1 and the second sub-stage B2.

[0067] Specifically, in combination Figures 9-11 , Figure 9 This is a schematic diagram of a pixel circuit structure provided in an embodiment of the present invention. Figure 10 To and Figure 4 A corresponding timing diagram, Figure 11 To and Figure 5 In one corresponding timing diagram, the duty cycles of the light emission control signals corresponding to the first frequency f1 and the second sub-stage B2 frequency f are different. The duty cycle is the percentage of the effective light emission level in the light emission cycle. Specifically, in... Figure 10 and Figure 11 In this context, the duty cycle of the light emission control signal corresponding to the first frequency f1 is represented by duty1, and the duty cycle of the light emission control signal corresponding to the frequency f of the second sub-stage B2 is represented by duty2.

[0068] See Figures 9-11The pixel circuit includes a driving transistor M0, a gate reset transistor M1, a data writing transistor M2, a threshold compensation transistor M3, a first light-emitting control transistor M4, a second light-emitting control transistor M5, an anode reset transistor M6, and a storage capacitor C.

[0069] Among them, the gate of the driving transistor M0 is electrically connected to the first node N1, the first electrode is electrically connected to the second node N2, and the second electrode is electrically connected to the third stage A2N3.

[0070] Gate reset transistor M1 has its gate electrically connected to the first scan line Scan1, its first terminal electrically connected to the reset signal line Vref, and its second terminal electrically connected to the first node N1. Gate reset transistor M1 is used to reset the gate of drive transistor M0 in response to the first scan valid level provided by the first scan line Scan1.

[0071] Data writing transistor M2 has its gate electrically connected to the second scan line Scan2, its first terminal electrically connected to the data line Data, and its second terminal electrically connected to the second node N2. Threshold compensation transistor M3 has its gate electrically connected to the second scan line Scan2, its first terminal electrically connected to the third node N3, and its second terminal electrically connected to the first node N1. Data writing transistor M2 and threshold compensation transistor M3 are used to charge the driving transistor M0 and perform threshold compensation in response to the second scan effective level provided by the second scan line Scan2. Figure 9 The transistor shown is a P-type transistor, therefore the effective level for the second scan is low.

[0072] The first light-emitting control transistor M4 has its gate electrically connected to the light-emitting control line Emit, its first terminal electrically connected to the power supply line PVDD, and its second terminal electrically connected to the second node N2. The second light-emitting control transistor M5 has its gate electrically connected to the light-emitting control line Emit, its first terminal electrically connected to the third node N3, and its second terminal electrically connected to the light-emitting element D. The first and second light-emitting control transistors M4 and M5 are used to transmit the drive current converted by the drive transistor M0 to the light-emitting element D in response to the effective light-emitting level provided by the light-emitting control line Emit, thereby controlling the light-emitting element D to emit light.

[0073] The anode reset transistor M6 has its gate electrically connected to the second scan line Scan2, its first terminal electrically connected to the reset signal line Vref, and its second terminal electrically connected to the light-emitting element D. The anode reset transistor M6 is used to reset the light-emitting element D in response to the second scan active level provided by the second scan line Scan2.

[0074] The storage capacitor C has its first plate electrically connected to the first node N1 and its second plate electrically connected to the power line PVDD.

[0075] In this embodiment, when the transistor in the pixel circuit is a P-type transistor, the first scan effective level, the second scan effective level, and the light emission effective level are all low. When the transistor in the pixel circuit is an N-type transistor, the first scan effective level, the second scan effective level, and the light emission effective level are all high. The accompanying drawings of this embodiment illustrate the use of a P-type transistor in the pixel circuit as an example.

[0076] The signal provided by the Emit control line is the light emission control signal. It can be understood that the duty cycle of the light emission control signal is used to control the light emission duration of the light-emitting element, thereby affecting the brightness of the sub-pixel.

[0077] like Figure 12 As shown, Figure 12 This is a schematic diagram of another working process of the display panel provided in the embodiment of the present invention. By controlling the duty cycle of the light emission control signal corresponding to the first frequency f1 and the second sub-stage B2 to be different, the brightness of the screen at the two frequencies can be adjusted as needed to reduce the brightness difference of the second screen displayed at the two frequencies. Then, when entering the third stage A2 from the second sub-stage B2, brightness flicker can be effectively avoided.

[0078] Furthermore, by adjusting the duty cycle of the light emission control signal at different frequencies, it is no longer necessary to adjust other conditions such as the gamma curve. For example, at this time, the frequencies of the first frequency f1 and the second sub-stage B2 can correspond to the same mapping relationship, making the adjustment of the panel control logic simpler.

[0079] Furthermore, combined Figure 4 , Figure 10 and Figure 12 The display panel has a first driving cycle T1 at a first frequency f1, which includes a write frame F1 and a hold frame F2. The display panel also has a second driving cycle T2 at a frequency f in the second sub-stage B2, which includes at least a write frame F1. The duty cycle of the light emission control signal in the first driving cycle T1 is less than the duty cycle of the light emission control signal in the second driving cycle B2.

[0080] Based on the foregoing analysis, it can be seen that the low frequency in this method is achieved using frame interpolation, resulting in a slightly higher screen brightness at the first frequency f1. By reducing the duty cycle of the light emission control signal in the first driving cycle T1, the light emission time of the light-emitting element can be shortened within the first driving cycle T1, reducing the screen brightness and thus narrowing the brightness difference between the third stage A2 and the second sub-stage B2. This prevents flickering when the second sub-stage B2 enters the third stage A2.

[0081] Furthermore, see Figure 12When both the first sub-stage B1 and the second sub-stage B2 have a second frequency f2, and the duty cycle of the light emission control signal in the first driving cycle T1 is less than that of the light emission control signal, the brightness of the first stage A1 and the first sub-stage B1 when displaying the first image can be made to be consistent, thereby avoiding flickering when the first stage A1 enters the first sub-stage B1.

[0082] When the first sub-stage B1 has a second frequency f2 and the second sub-stage B2 has a third frequency f3, the display panel has a third driving cycle under the second frequency f2. The duty cycle of the light emission control signal in the first driving cycle T1 can also be set to be less than the duty cycle of the light emission control signal in the third driving cycle, so that the brightness of the first stage A1 and the first sub-stage B1 when displaying the first image tends to be consistent, thereby avoiding flickering when the first stage A1 enters the first sub-stage B1.

[0083] Or, combine Figure 5 , Figure 11 and Figure 12 The display panel has a first driving cycle T1 at a first frequency f1, and a second driving cycle T2 at the frequency of the second sub-stage B2. The charging duration in the first driving cycle T1 is greater than the charging duration in the second driving cycle T2. The duty cycle of the light emission control signal in the second driving cycle T2 is less than the duty cycle of the light emission control signal in the first driving cycle T1.

[0084] Based on the foregoing analysis, it can be seen that the low frequency in this method is achieved using a non-frame interpolation approach, resulting in a slightly lower image brightness at the first frequency f1. By increasing the duty cycle of the light emission control signal in the first driving cycle T1, the light emission time of the light-emitting element can be shortened within the first driving cycle T1, reducing the light emission brightness and thus narrowing the brightness difference between the third stage A2 and the second sub-stage B2. This prevents flickering when the second sub-stage B2 enters the third stage A2.

[0085] Furthermore, see Figure 12 When both the first sub-stage B1 and the second sub-stage B2 have a second frequency f2, and the duty cycle of the light emission control signal in the first driving cycle T1 is greater than that of the light emission control signal, the brightness of the first stage A1 and the first sub-stage B1 when displaying the first image can be made to be consistent, thereby avoiding flickering when the first stage A1 enters the first sub-stage B1.

[0086] When the first sub-stage B1 has a second frequency f2 and the second sub-stage B2 has a third frequency f3, the display panel has a third driving cycle under the second frequency f2. The duty cycle of the light emission control signal in the first driving cycle T1 can also be set to be greater than the duty cycle of the light emission control signal in the third driving cycle, so that the brightness of the first stage A1 and the first sub-stage B1 when displaying the first image tends to be consistent, thereby avoiding flickering when the first stage A1 enters the first sub-stage B1.

[0087] In one feasible implementation, such as Figure 13 As shown, Figure 13 This is a schematic diagram of another working process of the display panel provided in the embodiment of the present invention. The second stage B displays the first image at a constant frequency. The entire second stage B does not require frequency switching or image switching, and the condition setting within the second stage B is simpler.

[0088] In one feasible implementation, such as Figure 14 As shown, Figure 14 This is a schematic diagram illustrating another working process of the display panel provided in an embodiment of the present invention. The second stage B includes a third sub-stage B3 and a fourth sub-stage B4, with the third sub-stage B3 located between the first stage A1 and the fourth sub-stage B4. The third sub-stage B3 and the fourth sub-stage B4 respectively display the first image, and the frequency of the third sub-stage B3 is greater than the first frequency f1 and less than the frequency of the fourth sub-stage B4.

[0089] For example, the frequency of the first stage A1 is 15Hz, the frequency of the third sub-stage B3 is 45Hz, the frequency of the fourth sub-stage B4 is 60Hz, and the frequency of the third stage A2 is 15Hz. As the foregoing analysis shows, the brightness of the same image varies at different frequencies. In this driving method, the frequencies of the first stage A1, the third sub-stage B3, and the fourth sub-stage B4 gradually increase. The third sub-stage B3 can be considered as a transition period between the first stage A1 and the fourth sub-stage B4, allowing the first image to gradually transition in brightness at different frequencies.

[0090] Alternatively, in another feasible implementation, such as Figure 15 As shown, Figure 15 This is a schematic diagram illustrating another working process of the display panel provided in an embodiment of the present invention. The second stage B includes a third sub-stage B3 and a fourth sub-stage B4, with the third sub-stage B3 located between the first stage A1 and the fourth sub-stage B4. The third sub-stage B3 and the fourth sub-stage B4 respectively display the first image, and the frequency of the fourth sub-stage B4 is greater than the first frequency f1 and less than the frequency of the third sub-stage B3.

[0091] For example, the frequency of the first stage A1 is 15Hz, the frequency of the third sub-stage B3 is 60Hz, the frequency of the fourth sub-stage B4 is 45Hz, and the frequency of the third stage A2 is 15Hz. This weakens the frequency jump when the fourth sub-stage B4 enters the third stage A2, and avoids a large frequency jump during screen switching, which would have a significant impact on the display.

[0092] In one feasible implementation, the second stage B includes x frames. To avoid the high-frequency time inserted in the low-frequency drive being too long and weakening the power saving effect, x can satisfy: 1≤x≤15.

[0093] Based on the same inventive concept, embodiments of the present invention also provide a display panel, such as... Figure 16 As shown, Figure 16 This is a schematic diagram of a display panel provided in an embodiment of the present invention. The display panel 100 is driven by the above-described driving method. Therefore, when the display panel is driven at low frequency, the impact of ghosting on the display can be effectively reduced when switching screens, so as to have better display performance.

[0094] Based on the same inventive concept, embodiments of the present invention also provide a display device, such as... Figure 17 As shown, Figure 17 This is a schematic diagram of a display device provided in an embodiment of the present invention. The display device includes the aforementioned display panel 100. The specific structure of the display panel 100 has been described in detail in the above embodiments and will not be repeated here. Figure 17 The display device shown is for illustrative purposes only. The display device can be any electronic device with display function, such as a mobile phone, tablet computer, laptop computer, e-reader or television.

[0095] 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.

[0096] 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, In the first mode, the driving process of the display panel includes a first stage, a second stage and a third stage, wherein in the first stage, a first image is displayed at a first frequency; in the second stage, for at least a portion of the time period adjacent to the first stage, the first image is displayed at a frequency greater than the first frequency; and in the third stage, a second image is displayed at the first frequency. The second stage includes a first sub-stage and a second sub-stage. In the first sub-stage, the first image is displayed at a frequency greater than the first frequency. In the second sub-stage, the second image is displayed at a frequency greater than the first frequency. The display panel displays the image according to a mapping relationship constructed from grayscale values ​​and data voltages. The first frequency and the frequency of the second sub-stage correspond to different mapping relationships. The same grayscale value corresponds to different data voltages in different mapping relationships. And / or, the duty cycles of the light emission control signals corresponding to the first frequency and the frequency of the second sub-stage are different. The duty cycle is the percentage of the effective light emission level in the light emission cycle. And / or, the second stage includes a third sub-stage and a fourth sub-stage, the third sub-stage being located between the first stage and the fourth sub-stage, the third sub-stage and the fourth sub-stage respectively displaying the first screen; wherein, the frequency of the third sub-stage is greater than the first frequency and less than the frequency of the fourth sub-stage, or, the frequency of the fourth sub-stage is greater than the first frequency and less than the frequency of the third sub-stage.

2. The driving method according to claim 1, characterized in that, The frequency of the second sub-stage is lower than the frequency of the first sub-stage.

3. The driving method according to claim 2, characterized in that, The difference between the frequency of the second sub-stage and the frequency of the first sub-stage is the first difference, and the difference between the frequency of the second sub-stage and the first frequency is the second difference. The first difference is equal to the second difference.

4. The driving method according to claim 1, characterized in that, The first sub-stage and the second sub-stage have the same frequency.

5. The driving method according to claim 1, characterized in that, The display panel has a first driving cycle at the first frequency, the first driving cycle including a write frame and a hold frame; the display panel has a second driving cycle at the frequency of the second sub-stage, the second driving cycle including at least a write frame. Wherein, the duty cycle of the light emission control signal in the first driving cycle is less than the duty cycle of the light emission control signal in the second driving cycle.

6. The driving method according to claim 1, characterized in that, The display panel has a first driving cycle at the first frequency, and the display panel has a second driving cycle at the frequency of the second sub-stage, wherein the charging duration in the first driving cycle is greater than the charging duration in the second driving cycle. In the second driving cycle, the duty cycle of the light emission control signal is less than the duty cycle of the light emission control signal in the first driving cycle.

7. The driving method according to claim 1, characterized in that, The second stage displays the first image at a constant frequency.

8. The driving method according to claim 1, characterized in that, The second phase consists of x frames, where 1 ≤ x ≤ 15.

9. A display panel, characterized in that, The driving method described in any one of claims 1 to 8 is applied.

10. A display device, characterized in that, Includes the display panel as described in claim 9.

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