Display panel, driving method of display panel, and display device

Abstract

The application discloses a display panel, a driving method of the display panel and a display device. The display panel comprises a pulse width modulation driving circuit and a light-emitting unit, and the pulse width modulation driving circuit is connected with the light-emitting unit. One frame time of the display panel comprises a data writing stage and a light-emitting stage, and the light-emitting stage comprises at least two sub-stages. The driving method of the display panel comprises the following steps: in the data writing stage, a data signal is provided to the pulse width modulation driving circuit; in at least one sub-stage, a sweep signal is provided to the pulse width modulation driving circuit, so that the pulse width modulation driving circuit controls the light-emitting time of the light-emitting unit according to the data signal and the sweep signal; and each sub-stage for providing the sweep signal corresponds to one sweep signal. The application can improve the screen flashing phenomenon of the display panel. Moreover, the light-emitting time of the light-emitting unit can be adjusted as a whole, and then the screen brightness of the display panel can be adjusted as a whole.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of display, and in particular, to a display panel, a driving method of the display panel and a display device. BACKGROUND

[0002] An active-matrix micro light emitting diode (AM micro-LED) display panel includes a pixel driving circuit and a light emitting device, the pixel driving circuit provides a driving current for the light emitting device, the light emitting device emits light under the driving of the driving current, and the display panel realizes display. When the pixel driving circuit provides the driving current for the light emitting device, the gray scale of the display panel can be represented by adjusting the driving time (or pulse width) of the driving current, and this driving method is called a pulse width modulation (PWM) driving method. When the pixel driving circuit is driven by the PWM driving method, a sweep signal (for example, a triangular wave or a ramp wave) provided externally can be compared with a data voltage signal, and the on or off of the control transistor of the pixel driving circuit can be controlled according to the comparison result, so that the time when the pixel driving current provides the driving current to the light emitting device can be controlled, and the light emitting time of the light emitting device can be controlled.

[0003] In the prior art, when the pixel driving circuit is driven by the PWM driving method, the time when the pixel driving circuit drives the light emitting device to emit light accounts for a small proportion of a frame time when the display panel displays low gray scale brightness, and the phenomenon of screen flickering is prone to occur, which affects the display effect of the display panel. Moreover, when the pixel driving circuit is driven by the PWM driving method, the luminance of the display panel cannot be adjusted on the whole screen, which reduces the user experience. SUMMARY

[0004] The present application provides a display panel, a driving method of the display panel and a display device, so as to realize the adjustment of the luminance of the display panel on the whole screen and improve the display effect of the display panel.

[0005] In a first aspect, an embodiment of the present application provides a driving method of a display panel, the display panel including a pulse width modulation driving circuit and a light emitting unit, the pulse width modulation driving circuit being connected with the light emitting unit; a frame time of the display panel including a data writing stage and a light emitting stage, the light emitting stage including at least two sub-stages; the driving method of the display panel including:

[0006] In the data writing stage, a data signal is provided to the pulse width modulation driving circuit;

[0007] In at least one of the sub-phases, a sweep signal is provided to the pulse width modulation driving circuit, so that the pulse width modulation driving circuit controls the light emitting time of the light emitting unit according to the data signal and the sweep signal; wherein each of the sub-phases in which the sweep signal is provided corresponds to one of the sweep signals.

[0008] Optionally, the sweep signal comprises a holding phase, and a level of the sweep signal in the holding phase is outside a range of data signals corresponding to different gray scales; before the sweep signal is provided to the pulse width modulation driving circuit in at least one of the sub-phases, the method further comprises:

[0009] increasing a duration of the holding phase of the sweep signal in the i-th sub-phase; wherein the increased duration is equal to a duration of the data writing phase, and i is an integer greater than or equal to 2.

[0010] Optionally, increasing the duration of the holding phase of the sweep signal in the i-th sub-phase comprises:

[0011] inserting a level signal of the duration of the data writing phase in the holding phase of the sweep signal; wherein the level signal is outside the range of the data signals corresponding to different gray scales, and at least part of the duration of the level signal is constant.

[0012] Optionally, the sweep signal comprises a sweep phase; a level of the sweep signal in the sweep phase varies within the range of the data signals corresponding to different gray scales; in at least one of the sub-phases, the sweep signal is provided to the pulse width modulation driving circuit, comprising:

[0013] in some of the sub-phases, triggering the sweep phase of the sweep signal to output to the pulse width modulation driving circuit, so that the pulse width modulation driving circuit controls the light emitting time of the light emitting unit according to the data signal and the sweep signal;

[0014] in some of the sub-phases, the sweep phase of the sweep signal is closed to output to the pulse width modulation driving circuit; wherein the sub-phases in which the sweep phase of the sweep signal is triggered to output and the sub-phases in which the sweep phase of the sweep signal is closed to output are regularly arranged.

[0015] Optionally, the sweep signal further comprises a holding phase, and a level of the sweep signal in the holding phase is outside the range of the data signals corresponding to different gray scales; in some of the sub-phases, the sweep phase of the sweep signal is closed to output to the pulse width modulation driving circuit, comprising:

[0016] in some of the sub-phases, the sweep signal is controlled to output the level of the holding phase in the sweep phase to the pulse width modulation driving circuit.

[0017] Optionally, in at least one of the sub-phases, a sweep signal is provided to the pulse width modulation driving circuit, comprising:

[0018] In different frames of the display panel, the sweep signal is periodically provided to the pulse width modulation driving circuit in at least two of the sub-phases.

[0019] Optionally, the sweep signal comprises a sweep phase; a level of the sweep signal in the sweep phase varies within a range of data signals corresponding to different gray scales; before the sweep signal is provided to the pulse width modulation driving circuit in at least one of the sub-phases, further comprising:

[0020] adjusting a slope of the sweep signal in the sweep phase;

[0021] Preferably, the slopes of the sweep signal in the sweep phase are equal in different sub-phases.

[0022] In a second aspect, embodiments of the present application further provide a display panel, comprising a driving unit, a pulse width modulation driving circuit and a light emitting unit;

[0023] The pulse width modulation driving circuit is connected to the light emitting unit; one frame time of the display panel comprises a data writing phase and a light emitting phase, the light emitting phase comprises at least two sub-phases; the driving unit is connected to the pulse width modulation driving circuit, the driving unit is configured to provide a data signal to the pulse width modulation driving circuit in the data writing phase, and provide a sweep signal to the pulse width modulation driving circuit in at least one of the sub-phases, so that the pulse width modulation driving circuit controls a light emitting time of the light emitting unit according to the data signal and the sweep signal; wherein each of the sub-phases in which the sweep signal is provided corresponds to one sweep signal.

[0024] Optionally, the driving unit comprises a data signal generation module, a sweep signal generation module and a switching module;

[0025] The data signal generation module is connected to a first input end of the switching module, the data signal generation module is configured to provide the data signal, the sweep signal generation module is connected to a second input end of the switching module, the sweep signal generation module is configured to provide the sweep signal, and an output end of the switching module is connected to the pulse width modulation driving circuit, the switching module is configured to switch the data signal generation module or the sweep signal generation module to be in communication with the pulse width modulation driving circuit;

[0026] Preferably, the switching module comprises a switching switch, a first end of the switching switch is connected with the data signal generation module, a second end of the switching switch is connected with the sweep signal generation module, and an output end of the switching switch is connected with the pulse width modulation driving circuit.

[0027] In a third aspect, the embodiment of the present application further provides a display device, comprising the display panel of the second aspect.

[0028] The technical scheme of the embodiment of the present application provides that the light emitting stage comprises at least two sub-stages, each sub-stage providing a sweep signal corresponds to a sweep signal, and in at least one sub-stage, a sweep signal is provided to the pulse width modulation driving circuit, so that the pulse width modulation driving circuit controls the light emitting time of the light emitting unit according to the data signal and the sweep signal. Therefore, the light emitting time of the light emitting unit can be divided into different sub-stages. In the case of ensuring that the light emitting time of the light emitting unit occupies a constant time of one frame, the non-light emitting time of the display panel in each sub-stage can be reduced, the degree of reduction of the light emitting brightness of the display panel is reduced, the switching frequency of the light emitting brightness of the display panel in one frame of time can be multiplied, and the screen flicker frequency of the display panel can be multiplied. This is beneficial to the screen flicker frequency of the display panel exceeding the perception range of the human eye, so as to improve the screen flicker phenomenon of the display panel when displaying a low gray scale. Moreover, by controlling the number of sub-stages providing sweep signals, the light emitting time of the light emitting unit can be adjusted as a whole when the data voltage is constant, that is, the proportion of the light emitting time of the light emitting unit in each sub-stage is constant. Therefore, the overall screen brightness of the display panel can be adjusted as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A timing diagram of a pixel driving circuit driven by a PWM driving method provided by the prior art;

[0030] Figure 2 A structural diagram of a display panel provided by the embodiment of the present application;

[0031] Figure 3 A flowchart of a driving method of a display panel provided by the embodiment of the present application;

[0032] Figure 4 A signal timing diagram of a display panel provided by the embodiment of the present application;

[0033] Figure 5 Another signal timing diagram of a display panel provided by the embodiment of the present application;

[0034] Figure 6 Another signal timing diagram of a display panel provided by the embodiment of the present application;

[0035] Figure 7 A signal timing diagram of another display panel provided by an embodiment of the present application is shown in FIG. 8;

[0036] Figure 8 A flowchart of a driving method of another display panel provided by an embodiment of the present application is shown in FIG. 9;

[0037] Figure 9 A signal timing diagram of another display panel provided by an embodiment of the present application is shown in FIG. 10;

[0038] Figure 10 A structure diagram of another display panel provided by an embodiment of the present application is shown in FIG. 11;

[0039] Figure 11 A signal timing diagram of a first frame of a display panel provided by an embodiment of the present application is shown in FIG. 12;

[0040] Figure 12 A signal timing diagram of a second frame of a display panel provided by an embodiment of the present application is shown in FIG. 13;

[0041] Figure 13 A signal timing diagram of a third frame of a display panel provided by an embodiment of the present application is shown in FIG. 14;

[0042] Figure 14 A signal timing diagram of a fourth frame of a display panel provided by an embodiment of the present application is shown in FIG. 15;

[0043] Figure 15 A signal timing diagram of a first frame of another display panel provided by an embodiment of the present application is shown in FIG. 16;

[0044] Figure 16 A signal timing diagram of a second frame of another display panel provided by an embodiment of the present application is shown in FIG. 17;

[0045] Figure 17 A signal timing diagram of a third frame of another display panel provided by an embodiment of the present application is shown in FIG. 18;

[0046] Figure 18 A signal timing diagram of a fourth frame of another display panel provided by an embodiment of the present application is shown in FIG. 19;

[0047] Figure 19 A signal timing diagram of another display panel provided by an embodiment of the present application is shown in FIG. 20;

[0048] Figure 20 A signal timing diagram of another display panel provided by an embodiment of the present application is shown in FIG. 21;

[0049] Figure 21 A signal timing diagram of another display panel provided by an embodiment of the present application is shown in FIG. 22;

[0050] Figure 22 FIG. 2 is a structural schematic diagram of another display panel according to an embodiment of the present application;

[0051] Figure 23 FIG. 3 is a structural schematic diagram of a display device according to an embodiment of the present application. DETAILED DESCRIPTION

[0052] The present application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are intended to be merely illustrative of the present application and not in limitation thereof. It should also be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings rather than all the parts.

[0053] Figure 1 FIG. 4 is a timing diagram of a pixel driving circuit driven by a PWM driving method according to the prior art. As shown in FIG. 4, one frame time t of the display panel can be divided into a data writing stage t1 and a light emitting stage t2. In the data writing stage t1, a data voltage data is input to the pixel driving circuit. In the light emitting stage t2, a sweep signal sweep starts to sweep under the triggering action of a trigger signal set. When the voltage of the sweep signal sweep is greater than the data voltage data, the control transistor of the pixel driving circuit is turned on, thereby controlling the time for the pixel driving circuit to provide a driving current to the light emitting device. Different display gray scales of the display panel correspond to different data voltages data. For example, when the control transistor of the pixel driving circuit is a P-type transistor, the smaller the display gray scale of the display panel, the greater the voltage value of the data voltage data. The smaller the time for the voltage of the sweep signal sweep to be greater than the data voltage data, the shorter the time for the control transistor of the pixel driving circuit to be turned on, and the shorter the light emitting time of the corresponding light emitting device in one frame, thereby making the non-light emitting time of the display panel longer. In the non-light emitting time of the display panel, due to the leakage current of the pixel driving circuit and other phenomena, the light emitting brightness of the display panel decreases, and the phenomenon of flickering between frames is prone to occur. For example, when the maximum display gray scale of the display panel is 255, and the display gray scale of the display panel is 32, then when the display gray scale of the display panel is 32, the light emitting time t32 of the light emitting device only accounts for about 32 / 255 of one frame time. Moreover, it can be known that, when the pixel driving circuit is driven by the PWM driving method, the light emitting brightness of the display panel cannot be adjusted on the whole screen, thereby reducing the user experience. Figure 1 Figure 1 Figure 1

[0054] To solve the above technical problems, the present application provides a display panel driving method for driving an AM micro-LED display panel. For example, Figure 2 ​​​A structural schematic diagram of a display panel is provided for an embodiment of the present application. The display panel comprises a pulse width modulation driving circuit 10 and a light emitting unit 20, and the pulse width modulation driving circuit 10 is connected with the light emitting unit 20. The pulse width modulation driving circuit 10 comprises a PWM part 11 and a control transistor T1, the output end of the PWM part 11 is connected with the control electrode of the control transistor T1, and the light emitting time of the light emitting unit 20 can be controlled through the conduction or non-conduction of the control transistor T1, thereby the gray scale and display brightness of the display panel can be controlled. Referring to Figure 2 , the display panel further comprises a driving unit 30, the driving unit 30 is connected with the PWM part 11 in the pulse width modulation driving circuit 10, and is used for providing a driving signal for the PWM part 11 in the pulse width modulation driving circuit 10. The driving signal can comprise a data signal and a sweep signal. Figure 3 A flowchart of a driving method of a display panel is provided for an embodiment of the present application. As shown in Figure 2 and Figure 3 , the driving method of the display panel comprises:

[0055] S110, providing a data signal to the pulse width modulation driving circuit in a data writing stage;

[0056] The working process of the pulse width modulation driving circuit 10 can be divided into a data writing stage and a light emitting stage when the pulse width modulation driving circuit 10 drives the light emitting unit 20 to emit light. The driving unit 30 can provide a data signal for the pulse width modulation driving circuit 10 in the data writing stage. The driving unit 30 can be a driving chip of the display panel. The data signal can be determined according to the display gray scale of the display panel, and different display gray scales correspond to different data signals.

[0057] S120, providing a sweep signal to the pulse width modulation driving circuit in at least one sub-stage, so that the pulse width modulation driving circuit controls the light emitting time of the light emitting unit according to the data signal and the sweep signal; each sub-stage of providing the sweep signal corresponds to a sweep signal.

[0058] The light emitting stage includes at least two sub-stages. The time length of a sub-stage can be equal to the period of the sweep signal provided in the sub-stage, so that one sub-stage can output one complete sweep signal, i.e., the sub-stage providing the sweep signal corresponds to one sweep signal. When the driving unit 30 outputs the sweep signal to the pulse width modulation driving circuit 10 in at least one sub-stage, the sweep signal can be provided to the pulse width modulation driving circuit 10 in each sub-stage, in part of the sub-stages, or only in one sub-stage. When the sweep signal is provided to the pulse width modulation driving circuit 10 in at least two sub-stages, the pulse width modulation driving circuit 10 can control the light emitting time of the light emitting unit 20 according to the data signal and the sweep signal in each sub-stage in which the sweep signal is provided to the pulse width modulation driving circuit 10. Thus, the light emitting time of the light emitting unit 20 in the light emitting stage can be divided into different sub-stages. When the display panel displays a low gray scale brightness, the light emitting time of the light emitting unit 20 corresponding to the low gray scale brightness can be divided into different sub-stages. In the case of ensuring that the light emitting time of the light emitting unit 20 corresponding to the low gray scale brightness occupies a constant time in one frame, the non-light emitting time of the display panel in each sub-stage can be reduced, the degree of decrease in the light emitting brightness of the display panel is reduced, the switching frequency of the light emitting brightness of the display panel in one frame can be multiplied, and the flicker frequency of the display panel can be multiplied, which is beneficial to the flicker frequency of the display panel exceeding the perception range of the human eye, so that the flicker phenomenon of the display panel in displaying a low gray scale can be improved. Exemplarily, Figure 4 A signal timing diagram of a display panel is provided for an embodiment of the present application. Wherein, data is the timing of the data signal, and sweep is the timing of the sweep signal. As shown in Figure 4 A frame time t of the display panel can be divided into a data writing stage t1 and a light emitting stage t2. The light emitting stage t2 includes four sub-stages, t21, t22, t23 and t24. Each sub-stage provides a sweep signal, and the time length of each sub-stage corresponds to the period of one sweep signal, so that each sub-stage can output one complete sweep signal, i.e., the light emitting stage t2 can output four sweep signals. Figure 4The example illustrates that in each sub-stage, the driving unit 30 outputs a sweep frequency signal to the pulse width modulation driving circuit 10. Therefore, under the condition that the data voltage remains constant, i.e., the display grayscale of the display panel remains constant, the light-emitting time of the light-emitting unit 20 within the light-emitting stage can be evenly divided into four sub-stages. When the display panel displays low grayscale brightness, while ensuring that the light-emitting time of the light-emitting unit 20 corresponding to low grayscale brightness remains constant within one frame, the non-light-emitting time of the display panel within each sub-stage can be reduced, thus reducing the degree of decrease in the display panel's brightness. Simultaneously, the switching frequency of the display panel's brightness can be increased several times within one frame, thereby increasing the display panel's flicker frequency several times. This helps the display panel's flicker frequency exceed the range of human eye perception, thereby improving the flicker phenomenon that occurs when the display panel displays low grayscale. For example, when the refresh rate of the display panel is 60Hz, the flicker frequency is increased fourfold from 60Hz to 240Hz, which exceeds the range of human eye perception, thus improving the display panel's flicker phenomenon.

[0059] Furthermore, when a sweep frequency signal is provided to the pulse width modulation drive circuit 10 in some sub-stages, and the data voltage remains constant while the proportion of the light-emitting time of the light-emitting unit 20 in each sub-stage remains constant, the overall light-emitting time of the light-emitting unit 20 can be reduced, thereby allowing for overall adjustment of the overall brightness of the display panel. For example, Figure 5 This is a signal timing diagram of another display panel provided in an embodiment of the present invention. Figure 5 As shown, the emission phase comprises four sub-phases, each with an equal duration. Figure 5 The example illustrates that in the first and third sub-stages, the driving unit 30 outputs a sweep frequency signal to the pulse width modulation driving circuit 10, and the duration of the first and third sub-stages is equal to the period of the sweep frequency signal provided in that sub-stage. In the second and fourth sub-stages, the driving unit 30 turns off the output of the sweep frequency signal. Therefore, when the data voltage remains constant, i.e., when the display grayscale of the display panel remains constant, the proportion of the light-emitting time of the light-emitting unit 20 to one frame time decreases by 50%, resulting in a 50% decrease in the overall brightness of the display panel, thus achieving overall brightness adjustment of the display panel.

[0060] It should be noted that, Figure 4 and Figure 5 The example shown illustrates a ramp signal as the sweep frequency signal. In other embodiments, the sweep frequency signal may also include other forms of signals, such as triangular wave signals, as long as the sweep frequency signal's level changes during the sweep process. Further reference continues... Figure 3 to Figure 5The sweep signal includes a holding stage and a sweep stage, and the driving unit 30 can also provide a trigger signal set to the pulse width modulation driving circuit 10. In the holding stage of the sweep signal, the level of the sweep signal is outside the range of the data signal corresponding to different gray scales. When the trigger signal set outputs a rising edge, the trigger signal set triggers the sweep signal to enter the sweep stage, so that the pulse width modulation driving circuit 10 controls the light emitting time of the light emitting unit 20 according to the sweep signal in the sweep stage and the data signal. For example, as shown in Figure 4 to Figure 5 the trigger signal set outputs a rising edge from low to high, the trigger signal set triggers the sweep signal to enter the sweep stage, so that the pulse width modulation driving circuit 10 controls the light emitting time of the light emitting unit 20 according to the sweep signal in the sweep stage and the data signal.

[0061] The technical scheme of the embodiment, by providing that the light emitting stage includes at least two sub-stages, each sub-stage providing a sweep signal corresponds to a sweep signal, and in at least one sub-stage, the sweep signal is provided to the pulse width modulation driving circuit, so that the pulse width modulation driving circuit controls the light emitting time of the light emitting unit according to the data signal and the sweep signal, thereby the light emitting time of the light emitting unit can be divided into different sub-stages, in the case of ensuring that the light emitting time of the light emitting unit occupies a constant time of a frame, the non-light emitting time of the display panel in each sub-stage can be reduced, the degree of decrease of the light emitting brightness of the display panel is reduced, at the same time, the switching frequency of the light emitting brightness of the display panel in a frame of time can be multiplied, and the flicker frequency of the display panel can be multiplied, which is beneficial to the flicker frequency of the display panel exceeding the perception range of the human eye, thereby the flicker phenomenon of the display panel in displaying low gray scales can be improved. Moreover, by controlling the number of sub-stages providing the sweep signal, the light emitting time of the light emitting unit can be adjusted as a whole when the data voltage is constant, i.e., the proportion of the light emitting time of the light emitting unit in each sub-stage is constant, and the screen brightness of the display panel can be adjusted as a whole.

[0062] On the basis of the above technical scheme, the sweep signal includes a holding stage, and the level of the sweep signal in the holding stage is outside the range of the data signal corresponding to different gray scales; before the sweep signal is provided to the pulse width modulation driving circuit in at least one sub-stage, the following steps are further included:

[0063] The length of the holding stage of the sweep signal in the i-th sub-stage is increased; wherein the increased length is equal to the length of the data writing stage, and i is an integer greater than or equal to 2.

[0064] The sweep signal can include a holding stage and a sweep stage. In the holding stage, the level of the sweep signal is outside the range of the data signal, and the light emitting unit is in a non-light emitting state. In the sweep stage, the sweep signal can be a ramp change. The pulse width modulation driving circuit controls the light emitting time of the light emitting unit according to the sweep stage sweep signal and the data signal. For example, in the sweep stage, when the sweep signal is greater than the data signal, the pulse width modulation driving circuit controls the light emitting unit to be in a light emitting state according to the sweep signal and the data signal. When the data signal changes according to different display gray scales, the pulse width modulation driving circuit can be controlled to change the light emitting time of the light emitting unit according to the sweep signal and the data signal, so as to adjust the display gray scale of the display panel.

[0065] After the one frame time of the display panel is divided into a data writing stage and a light emitting stage, the sweep signal is provided to the pulse width modulation driving circuit in the first sub-stage, and the non-light emitting time of the display panel before the pulse width modulation driving circuit controls the light emitting unit to emit light according to the data signal and the sweep signal includes the time length of the data writing stage and the time length of the holding stage of the sweep signal provided in the first sub-stage. The sweep signal is provided to the pulse width modulation driving circuit in the i-th sub-stage, and the non-light emitting time of the display panel before the pulse width modulation driving circuit controls the light emitting unit to emit light according to the data signal and the sweep signal includes the time length of the holding stage of the sweep signal provided in the i-th sub-stage. By increasing the time length of the holding stage of the sweep signal in the i-th sub-stage, and the increased time length is equal to the time length of the data writing stage, the non-light emitting time corresponding to different sub-stages is equal, so that the one frame time of the display panel can be evenly divided into a plurality of sub-stages, each sub-stage includes equal non-light emitting time and light emitting time, thereby further improving the screen flicker phenomenon of the display panel.

[0066] It should be noted that after increasing the time length of the holding stage of the sweep signal in the i-th sub-stage, the time length corresponding to the i-th sub-stage is greater than the time length corresponding to the first sub-stage. When the first sub-stage and the i-th sub-stage both provide the sweep signal, the period of the sweep signal provided in the i-th sub-stage is greater than the period of the sweep signal provided in the first sub-stage.

[0067] For example, Figure 6 Another signal timing diagram of a display panel is provided for the embodiments of the present application. As shown in Figure 6 The time length of the holding stage of the sweep signal in the i-th sub-stage is increased, including:

[0068] In the holding stage of the sweep signal, a level signal of the time length of the data writing stage is inserted. The level signal is outside the range of the data signal corresponding to different gray scales, and at least part of the time length of the level signal is constant.

[0069] Specifically, Figure 6The light emitting stage includes four sub-stages, t21, t22, t23 and t24, as shown in the example. Each sub-stage includes a holding stage t25. In the second to fourth sub-stages, the level output time t1' of the holding stage t25 can be increased, and the increased level output time t1' of the holding stage t25 is the length t1 of the data writing stage. Thus, the length of the holding stage t25 of the sweep signal can be increased, and the length of one frame of the display panel can be evenly divided into multiple sub-stages, each of which includes equal non-light emitting time and light emitting time, thereby further improving the screen flicker phenomenon of the display panel. As shown in the example, Figure 6 Referring back to Figure 6 , the trigger signal set triggers the transition edge of the sweep signal into the sweep stage, and the sweep signal triggers the sweep signal into the sweep stage at the end of the holding stage t25.

[0070] In other embodiments, a varying level signal of the length t1 of the data writing stage can also be inserted in the holding stage t25 of the sweep signal. As shown in the example, Figure 7 Another signal timing diagram of a display panel according to an embodiment of the present application is provided. As shown in the example, Figure 7 In the holding stage t25 of the sweep signal, the level signal of the length t1 of the data writing stage can include a level varying part. Specifically, Figure 7 The light emitting stage includes four sub-stages, and in the second to fourth sub-stages, the output of the ramp signal in the holding stage t25 can be increased, and the minimum level of the ramp signal is outside the range of the data signal, thereby increasing the length of the holding stage t25 of the sweep signal while ensuring that the light emitting unit is in a non-light emitting state.

[0071] It should be noted that the data writing stage can include an initialization stage. In the initialization stage, the initialization signal provided by the driving unit initializes the pulse width modulation driving circuit to improve the accuracy of the pulse width modulation driving circuit in writing the data signal.

[0072] On the basis of the above technical solutions, the sweep signal includes a sweep stage, and the level of the sweep signal in the sweep stage varies within the range of the data signal corresponding to different gray scales. Figure 8 A flowchart of a driving method of a display panel according to an embodiment of the present application is provided. As shown in the example, Figure 8 The driving method of the display panel includes:

[0073] S210, providing a data signal to a pulse width modulation driving circuit in a data writing stage;

[0074] S220, in part of the sub-stage, the sweep frequency stage output of the sweep frequency signal is triggered to the pulse width modulation driving circuit, so that the pulse width modulation driving circuit controls the light emitting time of the light emitting unit according to the data signal and the sweep frequency signal;

[0075] When the light emitting stage includes at least two sub-stages, the sweep frequency stage output of the sweep frequency signal can be triggered to the pulse width modulation driving circuit in part of the sub-stage, so that the pulse width modulation driving circuit controls the light emitting time of the light emitting unit according to the data signal and the sweep frequency signal of the sweep frequency stage. In this sub-stage, the proportion of the light emitting time of the light emitting unit in the sub-stage is equal to the proportion of the sum of the light emitting time of the light emitting unit in all sub-stages of the sweep frequency stage output of the sweep frequency signal to the sum of the time length of all sub-stages of the sweep frequency stage output of the sweep frequency signal, so that the display panel displays the display gray scale brightness corresponding to the data signal.

[0076] S230, in part of the sub-stage, the sweep frequency stage output of the sweep frequency signal is closed to the pulse width modulation driving circuit; wherein the sub-stage in which the sweep frequency stage output of the sweep frequency signal is triggered and the sub-stage in which the sweep frequency stage output of the sweep frequency signal is closed are regularly arranged.

[0077] In part of the sub-stage, the sweep frequency stage output of the sweep frequency signal can also be closed to the pulse width modulation driving circuit, so that in this sub-stage, the pulse width modulation driving circuit controls the light emitting unit to be in a non-light emitting state, thereby reducing the light emitting time of the light emitting unit as a whole, and further adjusting the overall screen brightness of the display panel. Moreover, the sub-stage in which the sweep frequency stage output of the sweep frequency signal is triggered and the sub-stage in which the sweep frequency stage output of the sweep frequency signal is closed are regularly arranged, so that the light emitting time of the light emitting unit in different sub-stages is regularly distributed in the light emitting stage of the display panel, thereby improving the screen flashing phenomenon of the display panel on the basis of adjusting the overall screen brightness of the display panel.

[0078] Exemplarily, Figure 9 Another signal timing diagram of a display panel is provided for the embodiment of the present application. As Figure 9As shown, the light-emitting stage includes four sub-stages. The sub-stage in which the sweep stage output of the sweep signal is triggered can be alternately arranged with the sub-stage in which the sweep stage output of the sweep signal is turned off, so that in the first and third sub-stages, the pulse width modulation driving circuit controls the light-emitting time of the light-emitting unit according to the data signal and the sweep signal of the sweep stage. In the second and fourth sub-stages, the pulse width modulation driving circuit controls the light-emitting unit to be in a non-light-emitting state. Thus, when the sweep stage output of the sweep signal is triggered to the pulse width modulation driving circuit in all four sub-stages, the total light-emitting time of the light-emitting unit is reduced by half on the basis of the overall brightness of the display panel, so that the overall brightness of the display panel is reduced by 50%, thereby the overall brightness of the display panel can be adjusted. At the same time, the flashing frequency of the display panel can be multiplied, which is beneficial to the flashing frequency of the display panel exceeding the perception range of the human eye, thereby the flashing phenomenon of the display panel in displaying low gray scale can be improved.

[0079] It should be noted that, Figure 9 In the embodiment, the sub-stage in which the sweep stage output of the sweep signal is triggered is arranged on the basis of increasing the time length of the hold stage of the sweep signal in the i-th sub-stage and regularly arranging the sub-stage in which the sweep stage output of the sweep signal is turned off. In other embodiments, after the light-emitting stage is divided into at least two sub-stages, the sub-stage in which the sweep stage output of the sweep signal is triggered can be regularly arranged with the sub-stage in which the sweep stage output of the sweep signal is turned off, which is not limited here. For example, as shown. Figure 5 In addition, Figure 9 In the embodiment, the sub-stage in which the sweep stage output of the sweep signal is triggered is alternately arranged with the sub-stage in which the sweep stage output of the sweep signal is turned off. In other embodiments, the sub-stage in which the sweep stage output of the sweep signal is triggered can be arranged with the sub-stage in which the sweep stage output of the sweep signal is turned off in other regularities, which is not limited here. For example, the first and second sub-stages can be arranged to trigger the sweep stage output of the sweep signal to the pulse width modulation driving circuit, and the third and fourth sub-stages can be arranged to turn off the sweep stage output of the sweep signal to the pulse width modulation driving circuit.

[0080] On the basis of the above technical solution, the sweep signal further includes a hold stage, the level of the sweep signal in the hold stage is outside the range of the data signal corresponding to different gray scales; in some sub-stages, the sweep stage output of the sweep signal is turned off to the pulse width modulation driving circuit, including:

[0081] In some sub-stages, the level of the sweep signal in the sweep stage output hold stage is controlled to the pulse width modulation driving circuit.

[0082] Specifically, during the frequency sweep phase where the sweep signal needs to be turned off, the output of the sweep signal can be kept at the level of the holding phase. This ensures that the sweep signal level during the sweep phase is outside the range of data signals corresponding to different gray levels. The pulse width modulation (PWM) driver circuit then controls the light-emitting unit to be in a non-emitting state, thus achieving the goal of turning off the sweep signal output to the PWM driver circuit during this sub-phase. Furthermore, when controlling the sweep signal output to hold the level of the PWM driver circuit, the driver unit can control the sweep signal output to hold the level of the holding phase during the sweep phase.

[0083] Continue to refer to Figure 9 The pulse width modulation (PWM) driver circuit can also input a trigger signal `set`. During the frequency sweep phase where the sweep signal needs to be turned off, the level of the trigger signal `set` can be kept constant in this sub-phase. This prevents the trigger signal `set` from forming a rising edge in this sub-phase, thus preventing it from triggering the sweep signal to enter the sweep phase. This maintains the sweep signal in the holding phase, during which the PWM driver circuit controls the light-emitting unit to be in a non-emitting state, achieving the output of the frequency sweep phase (where the sweep signal is turned off) to the PWM driver circuit.

[0084] Continue to refer to Figure 9 The pulse width modulation drive circuit can also input the light emission control signal EM. Figure 10 This is a schematic diagram of another display panel structure provided in an embodiment of the present invention. Figure 10 As shown, the pixel driving circuit also includes a light-emitting control switch T2, which is connected between the power supply voltage VDD and the light-emitting unit 20. The control electrode of the light-emitting control switch T2 receives a light-emitting control signal EM, which is used to control the conduction or cutoff of the light-emitting control switch T2. This controls the connection state between the power supply voltage VDD and the light-emitting unit 20, and thus controls the duration for which the pixel driving circuit provides driving current to the light-emitting unit 20. During the frequency sweep phase when the sweep signal needs to be turned off, the level of the light-emitting control signal EM can be controlled to turn off the light-emitting control switch T2, thereby controlling the light-emitting unit to be in a non-light-emitting state, thus adjusting the light-emitting time of the light-emitting unit, and consequently adjusting the overall brightness of the display panel. For example, Figure 10 The example shows that the light-emitting control switch T2 is a P-type transistor. Therefore, during the frequency sweep phase where the sweep signal needs to be turned off, the light-emitting control signal EM can be controlled to output a high level in this sub-phase, thus turning off the light-emitting control switch T2.

[0085] It should be noted that in other embodiments, the light-emitting control switch tube T2 can also be an N-type transistor, and in the sub-stage when the sweep frequency signal needs to be turned off, the light-emitting control signal EM can also be controlled to output a low level, so that the light-emitting control switch tube T2 is in an off state.

[0086] On the basis of the above technical solutions, in at least one sub-stage, the sweep frequency signal is provided to the pulse width modulation driving circuit, including:

[0087] In different frames of the display panel, at least two sub-stages periodically provide the sweep frequency signal to the pulse width modulation driving circuit.

[0088] When the sweep frequency signal is output to the pulse width modulation driving circuit in each sub-stage, the sweep frequency signals output by the at least two sub-stages are the same in different frames of the display panel, that is, the sweep frequency signal is output by each sub-stage in different frames of the display panel, so that the sweep frequency signal is periodically output to the pulse width modulation driving circuit in different frames of the display panel. The sweep frequency signal can be periodically output frame by frame, which is beneficial to evenly divide the light-emitting time of the display panel in a period, and further improves the screen flicker phenomenon of the display panel. When the sweep frequency signal is output to the pulse width modulation driving circuit by part of the sub-stages, the sweep frequency signal is periodically alternately output to the pulse width modulation driving circuit by part of the sub-stages in different frames of the display panel, which is beneficial to evenly divide the light-emitting time of the display panel in a period, and further improves the screen flicker phenomenon of the display panel.

[0089] For example, when the light-emitting stage includes four sub-stages, the four sub-stages can periodically provide the sweep frequency signal to the pulse width modulation driving circuit through four frames. Figure 11 A signal timing diagram of a first frame of a display panel provided by an embodiment of the present application is provided, Figure 12 A signal timing diagram of a second frame of a display panel provided by an embodiment of the present application is provided, Figure 13 A signal timing diagram of a third frame of a display panel provided by an embodiment of the present application is provided, Figure 14 A signal timing diagram of a fourth frame of a display panel provided by an embodiment of the present application is provided. As Figure 11 to Figure 14As shown, when there are 3 sub-stages outputting the sweep signal to the pulse width modulation driving circuit and 1 sub-stage closing the sweep signal output to the pulse width modulation driving circuit, in the first frame, the 1st to 3rd sub-stages output the sweep signal to the pulse width modulation driving circuit, and the 4th sub-stage closes the sweep signal output to the pulse width modulation driving circuit. In the second frame, the 1st, 2nd and 4th sub-stages output the sweep signal to the pulse width modulation driving circuit, and the 3rd sub-stage closes the sweep signal output to the pulse width modulation driving circuit. In the third frame, the 1st, 3rd and 4th sub-stages output the sweep signal to the pulse width modulation driving circuit, and the 2nd sub-stage closes the sweep signal output to the pulse width modulation driving circuit. In the fourth frame, the 2nd, 3rd and 4th sub-stages output the sweep signal to the pulse width modulation driving circuit, and the 1st sub-stage closes the sweep signal output to the pulse width modulation driving circuit. Thus, at least two sub-stages can periodically provide the sweep signal to the pulse width modulation driving circuit in different frames of the display panel, which is beneficial to dividing the light-emitting time of the display panel in one period and further improves the screen flicker of the display panel.

[0090] It should be noted that, Figure 11 to Figure 14 Exemplarily, 3 sub-stages outputting the sweep signal in each frame are shown. In other embodiments, 1 or 2 sub-stages outputting the sweep signal in each frame can also be provided, and in this case, 4 sub-stages can periodically provide the sweep signal to the pulse width modulation driving circuit in different frames, which is not limited herein. In addition, Figure 11 to Figure 14 Exemplarily, the time length of the holding stage of the sweep signal in each sub-stage is increased after the light-emitting stage is divided into at least two sub-stages. In other embodiments, whether each sub-stage provides the sweep signal to the pulse width modulation driving circuit can be directly set according to the periodicity after the light-emitting stage is divided into at least two sub-stages, which is not limited herein. Exemplarily, when the light-emitting stage includes 4 sub-stages, 4 sub-stages can periodically provide the sweep signal to the pulse width modulation driving circuit through 4 frames. Figure 15 Another signal timing diagram of a first frame of a display panel provided by an embodiment of the present application is shown in the following table, Figure 16 Another signal timing diagram of a second frame of a display panel provided by an embodiment of the present application is shown in the following table, Figure 17 Another signal timing diagram of a third frame of a display panel provided by an embodiment of the present application is shown in the following table, Figure 18 Another signal timing diagram of a fourth frame of a display panel provided by an embodiment of the present application is shown in the following table. As Figure 15 to Figure 18 shown, the difference from Figure 11 to Figure 14 is that the time length of the holding stage of the sweep signal in the i-th sub-stage in each frame is not increased. Wherein, i is an integer greater than or equal to 2.

[0091] On the basis of each of the above technical solutions, the sweep signal comprises a sweep phase; a level of the sweep signal in the sweep phase varies within a range of data signals corresponding to different gray scales; and before the sweep signal is provided to the pulse width modulation driving circuit in at least one sub-phase, the method further comprises:

[0092] adjusting a slope of the sweep signal in the sweep phase.

[0093] The slope of the sweep signal in the sweep phase can adjust a change rate of the sweep signal, so that the light emitting time of the light emitting unit corresponding to different display gray scales can be adjusted, and then the overall screen brightness of the display panel can be adjusted. For example, when the display gray scale of the display panel is determined, the value of the data signal is determined. When the slope of the sweep signal in the sweep phase becomes larger, the change rate of the sweep signal is relatively fast, and then the time for the sweep signal to change from the level in the holding phase to the data signal is relatively short, that is, the light emitting time of the light emitting unit corresponding to the current display gray scale of the display panel is shortened, so that the overall screen brightness of the display panel is reduced. When the slope of the sweep signal in the sweep phase becomes smaller, the change rate of the sweep signal is relatively slow, and then the time for the sweep signal to change from the level in the holding phase to the data signal is relatively long, that is, the light emitting time of the light emitting unit corresponding to the current display gray scale of the display panel is lengthened, so that the overall screen brightness of the display panel is increased.

[0094] For example, Figure 19 Another signal timing diagram of a display panel provided by an embodiment of the present application is provided. As shown in Figure 19 The light emitting phase comprises four sub-phases. Different from Figure 4 , the slope of the sweep signal in the sweep phase in each sub-phase is greater than Figure 4 the slope of the sweep signal in the sweep phase. Then Figure 19 the light emitting time of the corresponding light emitting unit is less than Figure 4 the light emitting time of the corresponding light emitting unit, so that Figure 19 the overall screen brightness of the corresponding display panel is less than Figure 4 the overall screen brightness of the corresponding display panel.

[0095] It should be noted that in other embodiments, when the sweep signal is provided to the pulse width modulation driving circuit in some sub-phases, the slope of the sweep signal in the sweep phase in some sub-phases can be adjusted. At this time, the number of sub-phases in which the sweep signal is provided can be controlled to adjust the overall screen brightness of the display panel, and at the same time, the slope of the sweep signal in the sweep phase in some sub-phases is adjusted to further adjust the light emitting time of the light emitting unit in some sub-phases, and then the overall screen brightness of the display panel can be further adjusted, so that the adjustment flexibility of the overall screen brightness of the display panel can be increased. For example, Figure 20 Another signal timing diagram of a display panel provided by an embodiment of the present application is provided. As shown in Figure 20As shown, the light-emitting stage includes four sub-stages. By setting the sweep frequency signals output in the first and third sub-stages, the overall screen brightness of the display panel can be reduced by 50%. Simultaneously, with... Figure 5 The difference lies in the fact that when outputting the sweep frequency signal in the sub-stage, the slope of the sweep frequency signal during the sweep stage is greater than... Figure 5 The slope of the frequency sweep signal during the frequency sweep phase, for example, Figure 5 The slope of the intermediate frequency sweep signal during the frequency sweep phase is Figure 20 The 80% slope of the intermediate frequency sweep signal during the sweep phase causes the light-emitting time of the light-emitting unit to decrease to 80% again, on top of a 50% decrease in the overall brightness of the display panel. This means that the overall brightness of the display panel decreases to 40%, allowing for more flexible adjustment of the overall brightness of the display panel.

[0096] Alternatively, in other embodiments, when providing the sweep signal to the pulse width modulation drive circuit in a sub-stage, the slope of the sweep signal in the sweep stage can be adjusted by increasing the holding stage duration of the sweep signal in the i-th sub-stage. For example, Figure 21 This is a signal timing diagram of another display panel provided in an embodiment of the present invention. Figure 21 As shown, with Figure 6 Similarly, the light-emitting stage includes four sub-stages. From the second to the fourth sub-stage, the duration of the sweep signal holding stage is increased, dividing one frame of the display panel into multiple sub-stages. Each sub-stage includes equal non-light-emitting time and light-emitting time, thereby further improving the screen flicker phenomenon of the display panel. Meanwhile, with... Figure 6 The difference is that when outputting the sweep frequency signal in the sub-stage, the slope of the sweep frequency signal in the sweep stage is greater than... Figure 6 The slope of the frequency sweep signal during the frequency sweep phase can be adjusted to improve the flickering phenomenon of the display panel, thereby adjusting the light emission time of the light-emitting unit and thus adjusting the overall brightness of the display panel.

[0097] In addition, the slope of the sweep signal can be set as needed in different sub-stages, thereby allowing for more flexible adjustment of the light emission time of the light-emitting unit and, consequently, more flexible adjustment of the overall brightness of the display panel.

[0098] Preferably, the slope of the sweep signal is equal in the sweep phase in different sub-phases.

[0099] Specifically, by setting the slope of the sweep signal to be equal in different sub-stages, the rate of change of the sweep signal in different sub-stages can be the same, that is, the light emission time of the light-emitting unit corresponding to different display gray levels is the same. This allows the light emission time of the light-emitting unit in any sub-stage to be proportional to the overall brightness of the display panel, which helps to simplify the adjustment of the overall brightness of the display panel.

[0100] The embodiment of the present application further provides a display panel. Figure 22 Another structural schematic diagram of a display panel is provided for the embodiment of the present application. Figure 22 As shown in the figure, the display panel comprises a driving unit 30, a pulse width modulation driving circuit 10 and a light emitting unit 20; the pulse width modulation driving circuit 10 is connected with the light emitting unit 20; one frame time of the display panel comprises a data writing stage and a light emitting stage, the light emitting stage comprises at least two sub-stages; the driving unit 30 is connected with the pulse width modulation driving circuit 10, the driving unit 30 is used for providing a data signal to the pulse width modulation driving circuit 10 in the data writing stage, and providing a sweep signal to the pulse width modulation driving circuit 10 in at least one sub-stage, so that the pulse width modulation driving circuit 10 controls the light emitting time of the light emitting unit 20 according to the data signal and the sweep signal; wherein each sub-stage providing the sweep signal corresponds to one sweep signal.

[0101] The technical scheme of the embodiment of the present application, by setting the light emitting stage to comprise at least two sub-stages, each sub-stage providing the sweep signal corresponding to one sweep signal, in at least one sub-stage, the driving unit provides the sweep signal to the pulse width modulation driving circuit, so that the pulse width modulation driving circuit controls the light emitting time of the light emitting unit according to the data signal and the sweep signal, thereby the light emitting time of the light emitting unit can be divided into different sub-stages, in the case of ensuring that the light emitting time of the light emitting unit occupies the time of one frame unchanged, the non-light emitting time of the display panel in each sub-stage can be reduced, the degree of the light emitting brightness reduction of the display panel is reduced, at the same time, the switching frequency of the light emitting brightness of the display panel in one frame time can be multiplied, and then the screen flashing frequency of the display panel can be multiplied, which is beneficial to the screen flashing frequency of the display panel exceeding the perception range of the human eye, thereby the screen flashing phenomenon of the display panel in displaying low gray scale can be improved. Moreover, by the driving unit controlling the number of sub-stages providing the sweep signal, the light emitting time of the light emitting unit can be adjusted as a whole when the data voltage is unchanged, i.e. the proportion of the light emitting time of the light emitting unit in each sub-stage is unchanged, and then the overall screen brightness of the display panel can be adjusted as a whole.

[0102] With reference to Figure 22 , the driving unit 30 comprises a data signal generating module 31, a sweep signal generating module 32 and a switching module 33; the data signal generating module 31 is connected with the first input end of the switching module 33, the data signal generating module 31 is used for providing the data signal, the sweep signal generating module 32 is connected with the second input end of the switching module 33, the sweep signal generating module 32 is used for providing the sweep signal, and the output end of the switching module 33 is connected with the pulse width modulation driving circuit 10, the switching module 33 is used for switching the data signal generating module 31 or the sweep signal generating module 32 to be in communication with the pulse width modulation driving circuit 10.

[0103] Specifically, in the data writing stage, the switching module 33 can connect the first input end with the output end, so that the data signal generating module 31 is connected with the pulse width modulation driving circuit 10, at this time, the data signal provided by the data signal generating module 31 is transmitted to the pulse width modulation driving circuit 10 through the switching module 33, so that the data signal can be provided to the pulse width modulation driving circuit 10. In at least one sub-stage, the switching module 33 can connect the second input end with the output end, so that the sweep signal generating module 32 is connected with the pulse width modulation driving circuit 10, at this time, the sweep signal provided by the sweep signal generating module 32 is transmitted to the pulse width modulation driving circuit 10 through the switching module 33, so that the sweep signal can be provided to the pulse width modulation driving circuit 10. Then the pulse width modulation driving circuit 10 controls the light emitting time of the light emitting unit according to the data signal and the sweep signal.

[0104] With reference to the foregoing Figure 22 , preferably, the switching module 33 comprises a switching switch K1, the first end of the switching switch K1 is connected with the data signal generating module 31, the second end of the switching switch K1 is connected with the sweep signal generating module 32, and the output end of the switching switch K1 is connected with the pulse width modulation driving circuit 10.

[0105] Specifically, Figure 22 The switching module 33 comprises a switching switch K1, which is switched to connect the first end or the second end with the output end, so that the data signal provided by the data signal generating module 31 can be transmitted to the pulse width modulation driving circuit 10 in the data writing stage, and the sweep signal provided by the sweep signal generating module 32 can be transmitted to the pulse width modulation driving circuit 10 in at least one sub-stage. The driving unit 30 can further comprise a control module (not shown in the figure), and the switching action of the switching switch K1 can be controlled by the control module according to the scanning signal. For example, at the end of the data writing stage, the scanning signal has a jump edge, and the control module controls the switching switch K1 to perform the switching action according to the jump edge of the scanning signal. Figure 22

[0106] On the basis of the above technical solutions, when at least two sub-stages are sequentially arranged after the data writing stage; the sweep signal comprises a holding stage, and the level of the sweep signal in the holding stage is located outside the range of the data signal corresponding to different gray scales; the driving unit further comprises:

[0107] an increasing module, configured to increase the duration of the holding stage of the sweep signal in the i-th sub-stage; wherein the increased duration is equal to the duration of the data writing stage, and i is an integer greater than or equal to 2.

[0108] ​Optionally, the increasing module is specifically configured to insert a level signal in the data write stage duration during the holding stage of the sweep signal; wherein the level signal is located outside the range of the data signals corresponding to different gray scales, and the level signal is constant at least in part of the duration.

[0109] On the basis of the above technical solutions, when the sweep signal comprises a sweep stage, and the level of the sweep signal in the sweep stage varies within the range of the data signals corresponding to different gray scales, the driving unit is specifically configured to:

[0110] In some sub-stages, the sweep stage output of the sweep signal is triggered to be output to the pulse width modulation driving circuit, so that the pulse width modulation driving circuit controls the light emitting time of the light emitting unit according to the data signal and the sweep signal;

[0111] In some sub-stages, the sweep stage output of the sweep signal is closed to be output to the pulse width modulation driving circuit; wherein the sub-stages in which the sweep stage output of the sweep signal is triggered to be output and the sub-stages in which the sweep stage output of the sweep signal is closed to be output are regularly arranged.

[0112] On the basis of the above technical solutions, when the sweep signal further comprises a holding stage, and the level of the sweep signal in the holding stage is located outside the range of the data signals corresponding to different gray scales, the driving unit is configured to, when the sweep stage output of the sweep signal is closed to be output to the pulse width modulation driving circuit in some sub-stages, specifically comprise:

[0113] In some sub-stages, the level of the sweep signal in the holding stage is controlled to be output to the pulse width modulation driving circuit.

[0114] On the basis of the above technical solutions, the driving unit is further configured to:

[0115] In different frames of the display panel, at least two sub-stages periodically provide the sweep signal to the pulse width modulation driving circuit.

[0116] On the basis of the above technical solutions, when the sweep signal comprises a sweep stage, and the level of the sweep signal in the sweep stage varies within the range of the data signals corresponding to different gray scales, the driving unit is further configured to:

[0117] Adjust the slope of the sweep signal in the sweep stage.

[0118] Preferably, the slopes of the sweep signal in the sweep stage in different sub-stages are equal.

[0119] The embodiment of the present application also provides a display device. Figure 23 A structural schematic diagram of a display device provided by the embodiment of the present application is shown in FIG. 1. Figure 23 As shown in the figure, the display device 100 comprises the display panel 101 provided by any embodiment of the present application.

[0120] Note that the above merely describes preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, modifications and substitutions can be made without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A driving method of a display panel, the display panel comprising a pulse width modulation driving circuit and a light emitting unit, the pulse width modulation driving circuit being connected with the light emitting unit; a frame time of the display panel comprising a data writing stage and a light emitting stage, the light emitting stage comprising at least two sub-stages; characterized in that, The driving method of the display panel comprises: In the data writing stage, a data signal is provided to the pulse width modulation driving circuit; In at least one of the sub-stages, a sweep signal is provided to the pulse width modulation driving circuit, so that the pulse width modulation driving circuit controls the light emitting time of the light emitting unit according to the data signal and the sweep signal; wherein each sub-stage in which the sweep signal is provided corresponds to one sweep signal; The sweep signal comprises a sweep stage; the level of the sweep signal in the sweep stage changes within the range of data signals corresponding to different gray scales; in at least one of the sub-stages, a sweep signal is provided to the pulse width modulation driving circuit, comprising: In some of the sub-stages, the sweep stage of the sweep signal is triggered to output to the pulse width modulation driving circuit, so that the pulse width modulation driving circuit controls the light emitting time of the light emitting unit according to the data signal and the sweep signal; In some of the sub-stages, the sweep stage of the sweep signal is closed to output to the pulse width modulation driving circuit; wherein the sub-stages in which the sweep stage of the sweep signal is triggered to output and the sub-stages in which the sweep stage of the sweep signal is closed to output are regularly arranged; The sweep signal comprises a hold stage; the level of the sweep signal in the hold stage is outside the range of data signals corresponding to different gray scales; before the sweep signal is provided to the pulse width modulation driving circuit in at least one of the sub-stages, further comprising: The length of the hold stage of the sweep signal in the i-th sub-stage is increased; wherein the increased length is equal to the length of the data writing stage, and i is an integer greater than or equal to 2; the length corresponding to the i-th sub-stage is greater than the length corresponding to the first sub-stage.

2. The driving method of a display panel according to claim 1, wherein The length of the hold stage of the sweep signal in the i-th sub-stage is increased, comprising: In the hold stage of the sweep signal, a level signal with the length of the data writing stage is inserted; wherein the level signal is outside the range of data signals corresponding to different gray scales, and at least part of the length of the level signal is constant.

3. The driving method of the display panel according to claim 2, wherein The sweep signal further comprises a hold stage; the level of the sweep signal in the hold stage is outside the range of data signals corresponding to different gray scales; in some of the sub-stages, the sweep stage of the sweep signal is closed to output to the pulse width modulation driving circuit, comprising: In some of the sub-stages, the level of the hold stage of the sweep signal in the sweep stage is controlled to output to the pulse width modulation driving circuit.

4. The driving method of the display panel according to any one of claims 1 to 3, wherein In at least one of the sub-stages, a sweep signal is provided to the pulse width modulation driving circuit, comprising: In different frames of the display panel, at least two of the sub-stages periodically provide the sweep signal to the pulse width modulation driving circuit.

5. The driving method of the display panel according to any one of claims 1 to 4, wherein The sweep signal comprises a sweep stage; the level of the sweep signal in the sweep stage changes within the range of data signals corresponding to different gray scales; Before the sweep signal is provided to the pulse width modulation driving circuit in at least one of the sub-stages, further comprising: The slope of the sweep signal in the sweep stage is adjusted.

6. The driving method of the display panel according to claim 5, wherein Slopes of the sweep signals in different sub-stages are equal.

7. A display panel, characterized by comprising: The display panel comprises a driving unit, a pulse width modulation driving circuit and a light emitting unit; The pulse width modulation driving circuit is connected with the light emitting unit; one frame time of the display panel comprises a data writing stage and a light emitting stage, the light emitting stage comprises at least two sub-stages; the driving unit is connected with the pulse width modulation driving circuit, the driving unit is configured to provide a data signal to the pulse width modulation driving circuit in the data writing stage, and provide a sweep signal to the pulse width modulation driving circuit in at least one of the sub-stages, so that the pulse width modulation driving circuit controls light emitting time of the light emitting unit according to the data signal and the sweep signal; wherein each sub-stage in which the sweep signal is provided corresponds to one sweep signal; The sweep signal comprises a sweep stage; when a level of the sweep signal in the sweep stage changes in a range of data signals corresponding to different gray scales, the driving unit is specifically configured to: In some of the sub-stages, the sweep stage of the sweep signal is triggered to output to the pulse width modulation driving circuit, so that the pulse width modulation driving circuit controls light emitting time of the light emitting unit according to the data signal and the sweep signal; In some of the sub-stages, the sweep stage of the sweep signal is closed to output to the pulse width modulation driving circuit; wherein the sub-stages in which the sweep stage of the sweep signal is triggered to output and the sub-stages in which the sweep stage of the sweep signal is closed to output are regularly arranged; The sweep signal comprises a holding stage, and a level of the sweep signal in the holding stage is located outside a range of data signals corresponding to different gray scales; The driving unit further comprises an increasing module configured to increase a time length of the holding stage of the sweep signal in the i-th sub-stage; wherein the increased time length is equal to a time length of the data writing stage, and i is an integer greater than or equal to 2; a time length corresponding to the i-th sub-stage is greater than a time length corresponding to the first sub-stage.

8. The display panel of claim 7, wherein, The driving unit comprises a data signal generation module, a sweep signal generation module and a switching module; The data signal generation module is connected with a first input end of the switching module, the data signal generation module is configured to provide the data signal, the sweep signal generation module is connected with a second input end of the switching module, the sweep signal generation module is configured to provide the sweep signal, and an output end of the switching module is connected with the pulse width modulation driving circuit, the switching module is configured to switch the data signal generation module or the sweep signal generation module to be in communication with the pulse width modulation driving circuit.

9. The display panel of claim 8, wherein, The switching module comprises a switching switch, a first end of the switching switch is connected with the data signal generation module, a second end of the switching switch is connected with the sweep signal generation module, and an output end of the switching switch is connected with the pulse width modulation driving circuit.

10. A display device, characterized by comprising: The display panel comprises the display panel of any one of claims 7-9.

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