Display panel and driving method therefor, and display device

Abstract

A display panel (100), a driving method, and a display device. The display panel (100) comprises a plurality of sub-pixels (1), wherein each sub-pixel (1) receives a first light-emission control signal (EM, EM1, EM2, PAM_EM, PAM_EM1, PAM_EM2). The display panel (100) at least comprises a first time (a1) and a second time (a2), the first time (a1) being different from the second time (a2), wherein the first time (a1) and the second time (a2) are respectively light-emission durations of different sub-pixels (1); or the first time (a1) and the second time (a2) are respectively turn-on moments of first light-emission control signals (EM, EM1, EM2, PAM_EM, PAM_EM1, PAM_EM2) for different sub-pixels (1); or the first time (a1) and the second time (a2) are respectively light-emission durations of the same sub-pixel (1) in different states; or the first time (a1) and the second time (a2) are respectively turn-on moments of a first light-emission control signal (EM, EM1, EM2, PAM_EM, PAM_EM1, PAM_EM2) for the same sub-pixel (1) in different states. The display panel (100), the driving method, and the display device improve the display uniformity.

Description

Display panel and its driving method, display device

[0001] This invention claims priority to Chinese Patent Application No. 202411533522.8, filed with the State Intellectual Property Office of China on October 30, 2024, entitled “Display Panel and Driving Method Thereof, Display Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of display technology, specifically to a display panel and its driving method, and a display device. Background Technology

[0003] With the continuous development of science and technology, more and more display devices are being widely used in people's daily lives and work, becoming indispensable tools for people today. Moreover, with the continuous development of display technology, consumers' requirements for monitors are constantly increasing, and various types of monitors are emerging, such as Organic Light Emitting Diode (OLED), Mini Light Emitting Diode (Mini LED), and Micro Light Emitting Diode (Micro LED).

[0004] Currently, the display panel has a display unevenness (Mura) problem. Summary of the Invention

[0005] In view of this, this application provides a display panel and its driving method and display device to improve the display uniformity of the display panel.

[0006] In a first aspect, embodiments of this application provide a display panel including a plurality of sub-pixels; the sub-pixels receive a first light emission control signal;

[0007] The display panel includes at least a first time and a second time, wherein the first time and the second time are different; wherein...

[0008] The first time and the second time are the emission times of different sub-pixels;

[0009] Alternatively, the first time and the second time are the activation times of the first light emission control signal for different sub-pixels;

[0010] Alternatively, the first time and the second time can be the emission time of the same sub-pixel in different states;

[0011] Alternatively, the first time and the second time are the activation times of the first light emission control signal of the same sub-pixel in different states.

[0012] Optionally, the first and second time points may differ under the same target grayscale.

[0013] For example, the sub-pixel also receives a second signal;

[0014] The time difference between the activation time of the first emission control signal and the activation time of the second signal of at least two different sub-pixels is different;

[0015] Alternatively, the time difference between the activation time of the first emission control signal and the activation time of the second signal is different in at least two different states for the same sub-pixel.

[0016] Optionally, the sub-pixel includes a pulse width modulation module and an amplitude modulation module, with the amplitude modulation module corresponding to the first emission control signal and the pulse width modulation module corresponding to the second signal.

[0017] For example, a sub-pixel includes an electrically connected pixel driving circuit and a light-emitting element;

[0018] The pixel driving circuit includes a second driving transistor, a pulse width modulation module, and an amplitude modulation module;

[0019] The second driving transistor is used to output a driving current according to the signal at the gate of the second driving transistor and the signal at the first terminal of the second driving transistor.

[0020] The pulse width modulation module outputs a pulse width setting signal to the first terminal of the amplitude modulation module based on the sweep frequency signal and the second light emission control signal to control the light emission time of the light-emitting element;

[0021] The amplitude modulation module is used to control the light-emitting element to emit light in response to the driving current under the control of the first light emission control signal.

[0022] Optionally, the second signal may include a frequency sweep signal.

[0023] For example, the start time of the frequency sweep signal is no later than the start time of the first light emission control signal.

[0024] Optionally, the subpixel's operation includes a data writing phase and a light emission phase.

[0025] During the data writing phase, the sweep frequency signal is at a high level; during certain periods of the light emission phase, the sweep frequency signal decreases linearly from a high level.

[0026] For example, the working process of a subpixel includes a data writing stage and a light emission stage;

[0027] During the data writing phase, the sweep signal is at a low level; during certain periods of the light emission phase, the sweep signal jumps from a low level to a high level and then decreases linearly from the high level.

[0028] Optionally, the second signal includes a second light emission control signal.

[0029] For example, the display panel includes multiple sub-display areas, including at least a first sub-display area and a second sub-display area, the first sub-display area including a first time, and the second sub-display area including a second time.

[0030] Optionally, the subpixel also receives a second signal;

[0031] In at least one sub-display area, the time difference between the activation time of the first light emission control signal and the activation time of the second signal of at least two different sub-pixels is the same.

[0032] For example, a sub-pixel includes an electrically connected pixel driving circuit and a light-emitting element;

[0033] The pixel driving circuit includes a pulse width modulation module, an amplitude modulation module, and a driving transistor;

[0034] The pulse width modulation module outputs a pulse width setting signal to the first terminal of the amplitude modulation module based on the frequency sweep signal and the second emission control signal.

[0035] The driving transistor is used to output driving current according to the signal at the gate of the driving transistor and the signal at the first terminal of the driving transistor;

[0036] The amplitude modulation module is used to control the light-emitting element to emit light in response to the driving current under the control of the first light emission control signal, and outputs the pulse width setting signal to the gate of the driving transistor to control the light emission time of the light-emitting element;

[0037] The first sub-display area and the second sub-display area receive different sweep frequency signals.

[0038] Optionally, multiple sub-pixels in the same sub-display area may share a single sweep frequency signal.

[0039] For example, the frequency sweep signal includes a first frequency sweep signal and a second frequency sweep signal, the first sub-display area receives the first frequency sweep signal, and the second sub-display area receives the second frequency sweep signal;

[0040] The frequency sweep signal includes signal change periods. The rate of change of the first frequency sweep signal during the signal change periods is different from that of the second frequency sweep signal during the signal change periods.

[0041] Optionally, the swept frequency signal has a difference between the maximum and minimum values ​​during the signal variation period.

[0042] The difference between the first and second frequency sweep signals is different.

[0043] For example, the duration of the first sweep signal during the signal change period is different from the duration of the second sweep signal during the signal change period.

[0044] Optionally, the display panel includes multiple first sub-display areas and multiple second sub-display areas, with at least one second sub-display area between any two adjacent first sub-display areas.

[0045] For example, the time difference between the start time of the sweep frequency signal and the start time of the first light emission control signal of any two adjacent sub-display areas is different.

[0046] Optionally, according to the scanning order of the sub-display areas, the time difference between the start time of the sweep frequency signal of different sub-display areas and the start time of the first light emission control signal gradually increases or gradually decreases.

[0047] For example, the time difference between the activation time of the second light emission control signal and the activation time of the first light emission control signal of any two adjacent sub-display areas is different.

[0048] Optionally, according to the scanning order of the sub-display areas, the time difference between the activation time of the second light emission control signal and the activation time of the first light emission control signal in different sub-display areas gradually increases or gradually decreases.

[0049] For example, compare the brightness of at least two different sub-pixels.

[0050] When the brightness of one sub-pixel is less than the brightness of another sub-pixel,

[0051] Make the first time of one sub-pixel greater than the second time of the other sub-pixel.

[0052] For example, at least two different sub-pixels have the same target brightness.

[0053] Optionally, compare the brightness of the same sub-pixel under different states;

[0054] When the brightness of a sub-pixel is less in one state than in another state,

[0055] Make the first time of a sub-pixel in one state greater than the second time of a sub-pixel in another state.

[0056] For example, the target brightness of the same sub-pixel is the same in different states.

[0057] Secondly, embodiments of this application provide a display device, including the display panel described above.

[0058] Thirdly, embodiments of this application provide a method for driving a display panel, including:

[0059] The control display panel includes at least a first time and a second time, wherein the first time and the second time are different; wherein,

[0060] The first time and the second time are the emission times of different sub-pixels;

[0061] Alternatively, the first time and the second time are the activation times of the first light emission control signal for different sub-pixels;

[0062] Alternatively, the first time and the second time can be the emission time of the same sub-pixel in different states;

[0063] Alternatively, the first time and the second time are the activation times of the first light emission control signal of the same sub-pixel in different states.

[0064] For example, compare the brightness of at least two different sub-pixels.

[0065] When the brightness of one sub-pixel is less than the brightness of another sub-pixel,

[0066] Make the first time of one sub-pixel greater than the second time of the other sub-pixel.

[0067] Optionally, at least two different sub-pixels must have the same target brightness.

[0068] For example, compare the brightness of the same sub-pixel in different states;

[0069] When the brightness of a sub-pixel is less in one state than in another state,

[0070] Make the first time of a sub-pixel in one state greater than the second time of a sub-pixel in another state.

[0071] Optionally, the target brightness of the same sub-pixel can be the same in different states.

[0072] By adopting the solution provided in the embodiments of this application, where the first time and the second time are the light emission times of different sub-pixels in the display panel, or the turn-on times of the first light emission control signals of different sub-pixels in the display panel, the embodiments of this invention can compensate for the brightness differences caused by different light emission times or different threshold voltage offsets of different sub-pixels by making the first time and the second time different, which is beneficial to improving the display consistency of different areas of the display panel.

[0073] In the case that the first time and the second time are the light emission times of the same sub-pixel in different states, or the first time and the second time are the activation times of the first light emission control signal of the same sub-pixel in different states, the embodiments of the present invention can avoid the flickering problem caused by the different brightness of the display panel at different times by making the first time and the second time different. Attached Figure Description

[0074] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0075] Figure 1 is a circuit diagram of a sub-pixel provided in an embodiment of the present invention;

[0076] Figure 2 is a timing diagram of two different sub-pixels in a display panel provided in an embodiment of the present invention.

[0077] Figure 3 is a circuit diagram of another sub-pixel provided in an embodiment of the present invention;

[0078] Figure 4 is another timing diagram of two different sub-pixels in the display panel provided in an embodiment of the present invention;

[0079] Figure 5 is a circuit diagram of another sub-pixel provided in an embodiment of the present invention;

[0080] Figure 6 is a timing diagram of one operation of the pixel driving circuit shown in Figure 5;

[0081] Figure 7 is another timing diagram of the pixel driving circuit shown in Figure 5;

[0082] Figure 8 is another timing diagram of the pixel driving circuit shown in Figure 5;

[0083] Figure 9 is another working timing diagram of two different sub-pixels in the display panel provided in the embodiment of the present invention;

[0084] Figure 10 is a schematic diagram of a display panel provided in an embodiment of the present invention;

[0085] Figure 11 is a schematic diagram of a display unit provided in an embodiment of the present invention;

[0086] Figure 12 is a schematic diagram of another display panel provided in an embodiment of the present invention;

[0087] Figure 13 is a timing diagram of a display panel provided in an embodiment of the present invention;

[0088] Figure 14 is a timing diagram of another display panel provided in an embodiment of the present invention;

[0089] Figure 15 is a timing diagram of another display panel provided in an embodiment of the present invention;

[0090] Figure 16 is a schematic diagram of a display device provided in an embodiment of the present invention. Detailed Implementation

[0091] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0092] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0093] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0094] 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, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0095] This invention provides a display panel comprising multiple sub-pixels. As shown in Figure 1, which is a circuit diagram of a sub-pixel according to an embodiment of the invention, sub-pixel 1 includes a pixel driving circuit 11 and a light-emitting element 12 electrically connected. Exemplarily, the light-emitting element 12 can be a light-emitting diode (LED), including mini LEDs, micro LEDs, or organic light-emitting diodes (OLEDs), etc., and can be designed according to actual conditions in specific implementations.

[0096] As shown in Figure 1, sub-pixel 1 receives a first emission control signal EM; wherein, the first emission control signal EM can control the emission time of sub-pixel 1. When the first emission control signal EM is at the enabled level, the driving current generated by the pixel driving circuit 11 flows through the light-emitting element 12, and the light-emitting element 12 is lit. When the first emission control signal EM is at the disabled level, the driving current no longer flows through the light-emitting element 12, and the light-emitting element 12 is in an off state. The brightness of the light-emitting element 12 is related to the magnitude of the driving current flowing through it and its emission duration within one frame period.

[0097] In this embodiment of the invention, the display panel includes at least a first time and a second time, and the first time and the second time are different. For example, the first time and the second time are the emission times of different sub-pixels in the display panel, respectively. Taking a display panel with multiple sub-pixels including a first sub-pixel and a second sub-pixel as an example, the emission time of the first sub-pixel can be the first time, and the emission time of the second sub-pixel can be the second time; here, emission time refers to the emission duration, which is the duration for which the first emission control signal EM is at the enabled level within one frame period.

[0098] Alternatively, the first time and the second time can be the turn-on time of the first light emission control signal EM for different sub-pixels in the display panel; here, the turn-on time can be understood as the moment of turn-on, that is, the moment when the first light emission control signal EM switches from an inactive level to an enabled level. For example, when the enabled level of the first light emission control signal EM is low, the turn-on time of the first light emission control signal EM is the time at which its falling edge occurs.

[0099] Alternatively, the first time and the second time can refer to the emission time of the same sub-pixel in different states; where different states can include different periods, for example, different periods include different frame periods; optionally, one frame period corresponding to one sub-pixel is one data refresh period. Alternatively, when a frame period includes multiple subframes, different periods can also be different subframes within one frame period. Taking the example of different states including a first state and a second state, the first time is the emission time of the sub-pixel in the first state, and the second time is the emission time of the same sub-pixel in the second state.

[0100] Alternatively, the first time and the second time can be the activation times of the first emission control signal EM to the same sub-pixel in different states. For example, the first time is the activation time of the first emission control signal EM provided to a certain sub-pixel in a first state, and the second time is the activation time of the first emission control signal EM provided to that sub-pixel in a second state different from the first state.

[0101] It is important to note here that the turn-on time of a signal refers to the time during which the signal transitions and remains in the on state of its corresponding controlled switch (i.e., thin-film transistor).

[0102] When the first time and the second time are the light-up times of different sub-pixels in the display panel, or the activation times of the first light-up control signals of different sub-pixels in the display panel, this embodiment of the invention can compensate for brightness differences caused by factors such as different light-up times or different threshold voltage shifts in different sub-pixels by making the first time and the second time different. This makes the actual brightness of different sub-pixels more consistent, which is beneficial to improving the display consistency of different areas of the display panel. The actual brightness can be obtained by a brightness detection instrument, and the actual brightness refers to the brightness exhibited after taking into account the influence of factors such as different light-up times or threshold voltage drift of the sub-pixels.

[0103] In the case where the first time and the second time are the light emission times of the same sub-pixel in different states, or the first time and the second time are the activation times of the first light emission control signal of the same sub-pixel in different states, the embodiments of the present invention can make the actual brightness of the same sub-pixel in different states more consistent by making the first time and the second time different, thereby avoiding the flickering problem caused by the different brightness of the display panel at different times.

[0104] For example, under the same target grayscale, the first time and the second time are different. In other words, for two different areas of sub-pixels that originally wanted to display the same target grayscale, they actually correspond to the first time and the second time, respectively; or the same sub-pixel originally wanted to display the same target grayscale in two different time states, they actually correspond to the first time and the second time, respectively. That is, the difference between the first time and the second time refers to the difference in time under the common reference standard of the same target grayscale. Here, the target grayscale is related to the image data received by the display panel, and the target grayscale can be regarded as the ideal grayscale that the sub-pixel is expected to achieve. By making the first time and the second time under the same target grayscale different, the embodiments of the present invention can compensate for the brightness difference caused by factors such as different emission times or different threshold voltage offsets of sub-pixels, improve the display consistency of different areas of the display panel, or avoid the flickering problem caused by the different brightness of the display panel at different times. Of course, this may lead to adjustments in the actual displayed grayscale or the emission brightness perceived by the naked eye, thereby compensating for the brightness difference of different areas.

[0105] It should be noted that the determination of the target grayscale will be explained in detail below, and will not be repeated here.

[0106] In one optional embodiment of the pixel driving circuit 11, as shown in FIG1, the pixel driving circuit 11 includes at least a driving transistor Tm, a data writing transistor M1, a light-emitting control transistor M2, and a storage capacitor Cst. Within one frame period, the operation of the pixel driving circuit 11 includes a data writing stage and a light-emitting stage. During the data writing stage, the data writing transistor M1 is turned on under the control of the scan signal S to write the data signal DATA to the gate of the driving transistor Tm; during the light-emitting stage, the light-emitting control transistor M2 is turned on under the control of the first light-emitting control signal EM, and the driving transistor Tm generates a driving current under the control of its gate voltage, providing the driving current to the light-emitting element 12.

[0107] Driving the light-emitting element 12 to emit light also requires setting a first power signal PVDD and a second power signal PVEE. Optionally, the first power signal PVDD is a positive power supply voltage, and the second power signal PVEE is a negative power supply voltage. In this embodiment of the invention, the driving current Id flowing through the light-emitting element 12 satisfies: Id = K1(Vgs - Vth) 2 Wherein, K1 is a constant related to the characteristics of the driving transistor Tm, Vgs is the gate-source voltage difference of the driving transistor Tm, and Vth is the threshold voltage of the driving transistor Tm. In this embodiment of the invention, as shown in FIG1, the gate of the driving transistor Tm is electrically connected to the data signal line DATA, and the first terminal is electrically connected to the first power signal line PVDD. That is, the data signal DATA and the first power signal PVDD affect the driving current Id generated by the driving transistor Tm, thereby affecting the brightness of the light-emitting element 12. In this embodiment of the invention, the duration for which the first light-emitting control signal EM is at the enable level within one frame period can be adjusted to adjust the duration for which the driving current Id flows through the light-emitting element 12, thereby adjusting the light-emitting time of the light-emitting element 12 and thus adjusting the brightness of the light-emitting element 12. Specifically, in this embodiment of the invention, the duration for which the first light-emitting control signal EM is at the enable level can be adjusted to adjust the time for which the driving current Id flows through the light-emitting element 12, thereby adjusting the light-emitting time of the light-emitting element 12 and thus adjusting the brightness of the light-emitting element 12.

[0108] For example, as shown in Figure 2, which is a timing diagram of two different sub-pixels in a display panel provided by an embodiment of the present invention, the two sub-pixels are a first sub-pixel and a second sub-pixel, and both can adopt the circuit structure shown in Figure 1. In Figure 2, S1 is a scanning signal provided to the first sub-pixel, S2 is a scanning signal provided to the second sub-pixel, EM1 is a first light emission control signal provided to the first sub-pixel, and EM2 is a first light emission control signal provided to the second sub-pixel. Figure 2 illustrates the first light emission control signal EM with an enable level of low. As shown in Figure 2, the light emission time of the first sub-pixel is a1, and the light emission time of the second sub-pixel is a2, a1 ≠ a2. Figure 2 illustrates a1 > a2 to compensate for the brightness difference caused by the different light emission times or threshold voltage offsets of the first and second sub-pixels, thereby improving the display consistency of different areas of the display panel.

[0109] In another optional embodiment, as shown in FIG3, FIG3 is a circuit diagram of another sub-pixel provided in an embodiment of the present invention, wherein the pixel driving circuit 11 includes a driving transistor Tm, a data writing transistor M1, a gate reset transistor M3, a threshold compensation transistor M4, an electrode reset transistor M7, a first light-emitting control transistor M5, a second light-emitting control transistor M6, and a storage capacitor Cst. Within one frame period, the operation of the pixel driving circuit 11 includes at least a reset phase, a data writing phase, and a light-emitting phase.

[0110] During the reset phase, the gate reset transistor M3 is turned on under the control of the second scan signal S2 to write the reset signal Ref to the gate of the driving transistor Tm, and the electrode reset transistor M7 is turned on under the control of the second scan signal S2 to write the reset signal Ref to the anode of the light-emitting element 12.

[0111] During the data writing stage, the data writing transistor M1 and the threshold compensation transistor M4 are turned on under the control of the first scan signal S1, writing the first data signal DATA to the gate of the driving transistor Tm and performing self-testing and compensation on the threshold voltage of the driving transistor Tm.

[0112] During the light-emitting stage, the first light-emitting control transistor M5 and the second light-emitting control transistor M6 are turned on under the control of the first light-emitting control signal EM. The driving transistor Tm generates a driving current under the control of its gate voltage and provides the driving current to the light-emitting element 12. The driving current Id satisfies Id = K2(V DATA -V PVDD ) 2 K2 is a constant related to the characteristics of the driving transistor Tm, V DATA V represents the voltage value of the first data signal DATA. PVDDThe voltage value of the first power supply signal PVDD is given. In this embodiment of the invention, by adjusting the duration of the first light-emitting control signal EM at the enable level within one frame period, the duration of the driving current Id flowing through the light-emitting element 12 can be adjusted, thereby adjusting the light-emitting time of the light-emitting element 12 and thus adjusting its brightness. Specifically, in this embodiment of the invention, the duration of the drive current Id flowing through the light-emitting element 12 can be adjusted by adjusting the on-time of the enable level provided by the first light-emitting control signal EM, thereby adjusting the light-emitting time of the light-emitting element 12 and its brightness.

[0113] For example, as shown in Figure 4, which is another working timing diagram of two different sub-pixels in the display panel provided by an embodiment of the present invention, the two sub-pixels are the first sub-pixel and the second sub-pixel, and both can adopt the circuit structure shown in Figure 3. In Figure 4, S11 is the first scanning signal provided to the first sub-pixel, S12 is the second scanning signal provided to the first sub-pixel, and EM1 is the first light emission control signal provided to the first sub-pixel; S21 is the first scanning signal provided to the second sub-pixel, S22 is the second scanning signal provided to the second sub-pixel, and EM2 is the first light emission control signal provided to the second sub-pixel. As shown in Figure 4, the light emission time of the first sub-pixel is a1, and the light emission time of the second sub-pixel is a2, a1 ≠ a2. Figure 4 uses a1 > a2 as an illustration to compensate for the brightness difference caused by the different light emission times or threshold voltage offsets of the first and second sub-pixels, thereby improving the display consistency of different areas of the display panel.

[0114] It is understood that the pixel driving circuit 11 shown in Figures 1 and 2 is only schematic and is not intended to limit the present invention. The pixel driving circuit 11 in the display panel provided by the present invention can adopt any circuit structure that can change the duration of the driving current flowing through the light-emitting element 12 by adjusting the first light-emitting control signal.

[0115] For example, as shown in Figures 5 and 6, Figure 5 is a circuit diagram of another sub-pixel provided in an embodiment of the present invention, and Figure 6 is a timing diagram of a pixel driving circuit shown in Figure 5. The pixel driving circuit includes a second driving transistor M7, a pulse width modulation (PWM) module 10 and an amplitude modulation (PAM) module 20 electrically connected to each other, and the amplitude modulation module 20 is electrically connected to the light-emitting element 12.

[0116] The pixel driving circuit 11 generates a duration-adjustable driving current under the control of the amplitude modulation module 20 and the pulse width modulation module 10. Specifically, the second driving transistor M7 outputs the driving current based on the signal at its gate and the signal at its first terminal. The amplitude modulation module 20 corresponds to the first emission control signal PAM_EM, that is, the amplitude modulation module 20 receives the first emission control signal PAM_EM; the pulse width modulation module 10 corresponds to the second signal, that is, the pulse width modulation module 10 receives the second signal. The second signal is another signal, besides the first emission control signal PAM_EM, provided to the sub-pixel that can affect the emission time of the sub-pixel. For example, the second signal includes a sweep frequency signal SWEEP and / or the second emission control signal PWM_EM.

[0117] For example, in this embodiment of the invention, the pulse width modulation module 10 is configured to output a pulse width setting signal to the first terminal of the amplitude modulation module 20 based on the second data signal PWM_DATA and the sweep frequency signal SWEEP, under the control of the second light emission control signal PWM_EM, so as to control the duration of providing driving current to the light emission element 12. In FIG5, the first terminal of the amplitude modulation module 20 is electrically connected to the first node N1.

[0118] The amplitude modulation module 20 is configured to control the light-emitting element 12 to emit light in response to the aforementioned driving current under the control of the first light-emitting control signal PAM_EM. When the first light-emitting control signal PAM_EM is at the enabled level, the driving current flows through the light-emitting element 12, and the light-emitting element 12 is lit. When the first light-emitting control signal PAM_EM is at the disabled level, the driving current cannot flow through the light-emitting element 12, and the light-emitting element 12 is in an off state.

[0119] Optionally, as shown in Figure 5, the pulse width modulation module 10 includes a first driving transistor M1, a first gate reset transistor M2, a first data writing transistor M3, a first compensation transistor M4, a first light-emitting control transistor M6, a second light-emitting control transistor M5, and a first capacitor C1.

[0120] The second light-emitting control transistor M5 is connected between the second power signal line PWM_PVDD and the first terminal of the first driving transistor M1. The first light-emitting control transistor M6 is connected between the second terminal of the first driving transistor M1 and the first node N1. The first data writing transistor M3 is connected between the second data signal line PWM_DATA and the first terminal of the first driving transistor M1. The first compensation transistor M4 is connected between the second terminal and the gate of the first driving transistor M1. The first gate reset transistor M2 is connected between the gate of the first driving transistor M1 and the pulse width reset signal line PWM_REF. The first plate of the first capacitor C1 is connected to the gate of the first driving transistor M1, and the second plate of the first capacitor C1 receives the sweep frequency signal SWEEP. The gate of the first gate reset transistor M2 receives the first pulse width scan signal PWM_S1, and the gates of the first data writing transistor M3 and the first compensation transistor M4 receive the second pulse width scan signal PWM_S2. The gates of the first light-emitting control transistor M6 and the second light-emitting control transistor M5 receive the second light-emitting control signal PWM_EM.

[0121] The amplitude modulation module 20 includes a second gate reset transistor M8, a second data writing transistor M9, a second compensation transistor M10, a third light-emitting control transistor M11, a fourth light-emitting control transistor M12, an electrode reset transistor M13, and a second capacitor C2.

[0122] The third light-emitting control transistor M11 is connected between the first power signal line PAM_PVDD and the first electrode of the second driving transistor M7. The fourth light-emitting control transistor M12 is connected between the second electrode of the second driving transistor M7 and the light-emitting element 12. The second driving transistor M7 generates a driving current under the control of its gate voltage. The gate of the second driving transistor M7 is electrically connected to the first node N1 to receive the pulse width setting signal output by the pulse width modulation module 10. The second data writing transistor M9 is connected between the first data signal line PAM_DATA and the first electrode of the second driving transistor M7. The second compensation transistor M10 is connected to the second electrode and the gate of the second driving transistor M7. The second gate reset transistor M8 is connected to the gate of the second driving transistor M7 and the amplitude reset signal line PAM_REF. The electrode reset transistor M13 is connected to the first electrode of the light-emitting element 12. The fourth light-emitting control transistor M12 is also connected to the first electrode of the light-emitting element 12. The second electrode of the light-emitting element 12 is connected to the third power signal line PVEE. Specifically, the gate of the second gate reset transistor M8 receives the first amplitude scan signal PAM_S1; the gates of the second data write transistor M9, the second compensation transistor M10, and the electrode reset transistor M13 receive the second amplitude scan signal PAM_S2. The gates of the third light-emitting control transistor M11 and the fourth light-emitting control transistor M12 receive the first light-emitting control signal PAM_EM.

[0123] It should be noted that the connection of the first terminal of the electrode reset transistor M13 to the third power supply signal line PVEE shown in Figure 5 is merely illustrative. In other embodiments, the first terminal of the electrode reset transistor M13 may also receive the amplitude reset signal PAM_REF, that is, the first terminal of the electrode reset transistor M13 and the first terminal of the second gate reset transistor M8 receive the same signal. In other embodiments, the first terminal of the electrode reset transistor M13 is not connected to the third power supply signal line PVEE, and the first terminal of the electrode reset transistor M13 and the first terminal of the second gate reset transistor M8 receive different signals; these are not illustrated in the accompanying drawings.

[0124] For example, as shown in Figure 6, within one frame period, the operation of the pixel driving circuit 11 includes a data writing stage P1 and a light emission stage P2. Optionally, the data writing stage P1 can be divided into a first writing stage t1 and a second writing stage t2. Optionally, one frame period corresponding to one sub-pixel is one data refresh period, which is one period of the first writing stage t1.

[0125] In the first write stage t1, the amplitude modulation module 20 sequentially executes the first gate reset stage t11 and the first data write stage t12.

[0126] During the first gate reset stage t11, the first amplitude scan signal PAM_S1 is at the enable level, the second gate reset transistor M8 is turned on, and the amplitude reset signal PAM_REF is written into the gate of the second driving transistor M7 through the second gate reset transistor M8 to reset the gate of the second driving transistor M7.

[0127] During the first data writing phase t12, the second amplitude scan signal PAM_S2 is enabled, the second data writing transistor M9 and the second compensation transistor M10 are turned on, and the first data signal PAM_DATA is written to the gate of the second driving transistor M7 through the second data writing transistor M9 and the second compensation transistor M10, and threshold compensation is performed. Optionally, during this phase, the electrode reset transistor M13 is turned on to reset the electrodes of the light-emitting element 12.

[0128] In the second write phase t2, the pulse width modulation module 10 sequentially executes the second gate reset phase t21 and the second data write phase t22.

[0129] During the second gate reset stage t21, the first pulse width scan signal PWM_S1 is at the enable level, the first gate reset transistor M2 is turned on, and the pulse width reset signal PWM_REF is written into the gate of the first driving transistor M1 through the first gate reset transistor M2 to reset the gate of the first driving transistor M1.

[0130] During the second data writing stage t22, the second pulse width scanning signal PWM_S2 is enabled, the first data writing transistor M3 and the first compensation transistor M4 are turned on, and the second data signal PWM_DATA is written to the gate of the first driving transistor M1 through the turned-on first data writing transistor M3 and first compensation transistor M4, and threshold compensation is performed. The second data signal PWM_DATA is related to the grayscale of the sub-pixel in the current frame. The second data signal PWM_DATA applied to the sub-pixel is different when displaying different grayscale levels. For example, the second data signal PWM_DATA applied at grayscale level 0 and grayscale level 255 are different.

[0131] Then, the light emission stage P2 is entered. In the light emission stage P2, the second light emission control signal PWM_EM is enabled, the first light emission control transistor M6 and the second light emission control transistor M5 are turned on, and the pulse width setting signal generated by the pulse width modulation module 10 based on the second data signal PWM_DATA and the sweep frequency signal SWEEP can be transmitted to the first node N1.

[0132] The first light-emitting control signal PAM_EM is at the enable level, and the third light-emitting control transistor M11 and the fourth light-emitting control transistor M12 are turned on.

[0133] It should be noted that the above-mentioned light-emitting stage P2 is not the stage in which the light-emitting element 12 effectively emits light. The light-emitting stage P2 includes the effective light-emitting period and the non-light-emitting period. The light-emitting stage P2 can be understood as the stage in which the first light-emitting control signal PAM_EM is at the enable level.

[0134] During the light-emitting stage P2, the first light-emitting control signal PAM_EM controls the third light-emitting control transistor M11 and the fourth light-emitting control transistor M12 to turn on. The second driving transistor M7 generates a driving current under the control of its gate voltage. Therefore, the amplitude modulation module 20 provides the driving current to the light-emitting element 12. Driving current Id = K3(V PAM_DATA -V PAM_PVDD ) 2 V PAM_DATA V represents the voltage value of the first data signal PAM_DATA. PAM_PVDD K is the voltage value of the first power supply signal PAM_PVDD, and K3 is a constant related to the characteristics of the second driving transistor M7.

[0135] The second light-emitting control signal PWM_EM controls the conduction of the first light-emitting control transistor M6 and the second light-emitting control transistor M5 during the signal change period. During the signal change period, the sweep frequency signal SWEEP is a ramp signal that gradually changes from a high level to a low level. When the sweep frequency signal SWEEP changes, due to the coupling effect of the first capacitor C1, the gate voltage of the first driving transistor M1 changes from the initial gate voltage. The initial gate voltage is the voltage of the gate of the first driving transistor M1 at the initial moment of the signal change period, and the initial gate voltage is related to the second data signal PWM_DATA. When the gate voltage of the first driving transistor M1 changes to the critical voltage Vg', Vg' = Vs - |Vth|, where Vs is the source voltage of the first driving transistor M1, Vs = V PWM_PVDD When the first driving transistor M1 changes from the off state to the on state, the second power supply signal PWM_PVDD, which serves as the pulse width setting signal, is supplied to the first node N1 via the on-state first driving transistor M1 and the first light-emitting control transistor M6. This causes the second driving transistor M7 to turn off, thereby stopping the supply of driving current to the light-emitting element 12. The initial gate voltage of the first driving transistor M1 varies depending on the second data signal PWM_DATA, and correspondingly, the time required for the gate voltage of the first driving transistor M1 to change to the critical voltage Vg' varies, meaning the time the first driving transistor M1 remains in the off state changes accordingly. Figure 6 illustrates this with the first driving transistor M1 being on when the voltage value of the sweep signal SWEEP changes to V1.

[0136] Figure 6 illustrates time point t3′, which is the time when the second driving transistor M7 is turned off. That is, at time point t3′, the voltage value of the sweep frequency signal SWEEP changes to V1. Therefore, the time period between the turn-on time of the first light-emitting control signal PAM_EM and time point t3′ is the effective light-emitting period t31 of the light-emitting element 12.

[0137] For example, as shown in Figure 6, during the data writing phase P1, the sweep frequency signal SWEEP is at a low level; during a portion of the light emission phase P2, for example, as shown in Figure 6, at the initial stage of the light emission phase P2, the sweep frequency signal SWEEP jumps from a low level to a high level and then linearly decreases from the high level, with a voltage change of ΔV. SWEEP .

[0138] For example, as shown in Figure 6, at least during the second data writing phase t22, that is, at least during the period when the second pulse width scan signal PWM_S2 is the enable signal, the sweep frequency signal SWEEP is at a low level. After the enable signal period of the second pulse width scan signal PWM_S2 ends, the sweep frequency signal SWEEP jumps from a low level V2 to a high level V3, and the voltage change is V3-V2=△VSWEEP In the light-emitting stage P2, the sweep signal SWEEP includes a signal change period. During this period, SWEEP is a ramp signal that gradually changes from a high level V3 to a low level V2. Since SWEEP is connected to the gate of the first driving transistor M1 through the first capacitor C1, the gate potential of the first driving transistor M1 is raised during the transition from a low to a high level. After the second data signal PWM_DATA is written and threshold compensation is performed, the gate voltage of the first driving transistor M1 increases by ΔV. SWEEP That is, the initial gate voltage Vg1 = V PWM_DATA -|Vth|+△V SWEEP V PWM_DATA Vth is the voltage value of the second data signal PWM_DATA, and Vth is the threshold voltage of the first driving transistor M1.

[0139] With the critical voltage Vg' of the first driving transistor M1 fixed, the sweep signal SWEEP, using the timing shown in Figure 6, can reduce the voltage value of the second data signal PWM_DATA required for the gate voltage of the first driving transistor M1 to reach the target gate voltage. When the voltage value of the second data signal PWM_DATA is fixed, after data writing, the signal transition of the sweep signal SWEEP will raise the gate voltage of the first driving transistor M1. When the rate of change of the sweep signal SWEEP is fixed, there will be a longer time for the gate potential of the first driving transistor M1 to drop from the initial gate voltage to the critical voltage Vg'. That is, the time that the first driving transistor M1 is in the off state during the light-emitting stage P2 will be longer, and the corresponding duration for the amplitude modulation module 20 to provide driving current to the light-emitting element 12 will be longer. Therefore, the waveform design of the sweep signal SWEEP as shown in Figure 6 can improve the degree of freedom in controlling the flow period of the driving current.

[0140] Optionally, as shown in Figure 7, which is another timing diagram of the pixel driving circuit shown in Figure 5, during the data writing stage P1, the sweep frequency signal SWEEP is at a high level; during a portion of the light emission stage P2, the sweep frequency signal SWEEP linearly decreases from a high level, with a voltage change of ΔV. SWEEP In this case, the initial gate voltage Vg1 = V PWM_DATA -|Vth|.

[0141] Optionally, this embodiment of the invention also provides another timing diagram that can be used to drive the pixel driving circuit provided in the embodiment of FIG5. As shown in FIG8, FIG8 is another working timing diagram of the pixel driving circuit shown in FIG5. The working process of the pixel driving circuit 11 includes a writing stage P1 and a light emission stage P2. The writing stage P1 can be divided into a first writing stage t1 and a second writing stage t2. The first writing stage t1 includes a first gate reset stage t11 and a first data writing stage t12. The second writing stage t2 includes a second gate reset stage t21 and a second data writing stage t22. The first gate reset stage t11 and the second gate reset stage t21 overlap at least partially, and the first data writing stage t12 and the second data writing stage t22 overlap at least partially.

[0142] In this embodiment of the invention, as shown in Figure 6, there is a time difference dt1 between the activation time of the first light emission control signal PAM_EM and the activation time of the sweep frequency signal SWEEP. The activation time of the sweep frequency signal SWEEP refers to the moment when the sweep frequency signal SWEEP begins to decrease.

[0143] Optionally, the time difference dt1 between the activation time of the first emission control signal PAM_EM and the activation time of the sweep frequency signal SWEEP of at least two different sub-pixels is different.

[0144] Referring to Figure 6, assuming that when the sweep signal SWEEP drops to V1, V2≤V1≤V3, the first driving transistor M1 in the pulse width modulation module 10 is turned on, and the second power supply signal PWM_PVDD, which serves as the pulse width setting signal, is transmitted to the first node N1, controlling the second driving transistor M7 to turn off, and the light-emitting element 12 begins to stop emitting light. Also, assuming that the initial potential of the sweep signal SWEEP during the signal change period is V3, the duration of the signal change period is b, and the potential of the sweep signal SWEEP at the end of the signal change period is V2. As shown in Figure 6, after entering the signal change period, the sweep signal SWEEP, after time dt1 (i.e., when the first light-emitting control signal PAM_EM is turned on), changes its potential from V3 to V3-dt1×k, where k is the slope of the sweep signal SWEEP during the signal change period, k=(V3-V2) / b. After time t31, the potential of the sweep frequency signal SWEEP changes from V3-dt1×k to V3-dt1×k–t31×k=V1, and the light-emitting element 12 stops emitting light. It can be deduced that t31=(V3-V1) / k-dt1. Therefore, by differentiating the time difference dt1 between the activation time of the sweep frequency signal SWEEP provided to different sub-pixels and the activation time of the first light-emitting control signal, the effective light-emitting time t31 of the two sub-pixels can be differentiated. This allows for adjustment of the brightness of the two sub-pixels by regulating their effective light-emitting time, thereby improving the brightness uniformity of the display panel.

[0145] Optionally, in this embodiment of the invention, the target gray level can be determined by the second data signal PWM_DATA and the sweep frequency signal SWEEP.

[0146] For example, in this embodiment of the invention, the second data signal PWM_DATA of at least two different sub-pixels with different effective emission times t31 is the same, and / or, the sweep frequency signal SWEEP of at least two different sub-pixels with different effective emission times t31 is the same. Wherein, the sweep frequency signal SWEEP of at least two different sub-pixels is the same, including that the waveforms of the sweep frequency signals SWEEP of at least two different sub-pixels are the same; in other words, the start time of the sweep frequency signals SWEEP of at least two different sub-pixels, i.e., the start time of the signal change period, is the same, and the duration and slope of the sweep frequency signals SWEEP of at least two different sub-pixels during the signal change period are respectively the same.

[0147] For example, as shown in FIG9, FIG9 is another working timing diagram of two different sub-pixels in the display panel provided in the embodiment of the present invention. The two sub-pixels are a first sub-pixel and a second sub-pixel, and both can adopt the circuit structure shown in FIG5. In FIG9, SWEEP1 is a sweep frequency signal provided to the first sub-pixel, PAM_EM1 is a first light emission control signal provided to the first sub-pixel, and PWM_EM1 is a second light emission control signal provided to the first sub-pixel; SWEEP2 is a sweep frequency signal provided to the second sub-pixel, PAM_EM2 is a first light emission control signal provided to the second sub-pixel, and PWM_EM2 is a second light emission control signal provided to the second sub-pixel. As shown in Figure 9, the time difference between the activation time of the first light emission control signal PAM_EM of the first sub-pixel and the activation time of the sweep frequency signal SWEEP is dt11, and the time difference between the activation time of the first light emission control signal PAM_EM of the second sub-pixel and the activation time of the sweep frequency signal SWEEP is dt12. dt11 ≠ dt12. Figure 9 uses dt11 > dt12 as an illustration.

[0148] Alternatively, the time difference between the activation time of the first emission control signal PAM_EM and the activation time of the sweep frequency signal SWEEP are different in at least two different states of the same sub-pixel, so that the effective emission time of the sub-pixel is different in at least two different states, thereby adjusting the actual brightness of the sub-pixel in at least two different states, so that the two tend to be consistent and avoid flickering problems caused by brightness differences.

[0149] Optionally, in some embodiments, the start time of the sweep frequency signal SWEEP in each frame period is the same as the start time of its respective frame period, and the time difference between the start time of the first emission control signal PAM_EM of the first sub-pixel and the start time of its respective frame period is greater than the time difference between the start time of the first emission control signal PAM_EM of the second sub-pixel and the start time of its respective frame period.

[0150] Optionally, in this embodiment, the ramp signal length and slope of the sweep frequency signal SWEEP are the same in each frame period. However, in some other optional embodiments of this application, the design below regarding the different ramp signal lengths and slopes of the sweep frequency signal SWEEP can be combined to allow the changes in the sweep frequency signal SWEEP and the first light emission control signal PAM_EM to work together to improve the display effect.

[0151] For example, as shown in FIG6, in an embodiment of the present invention, there is a time difference dt2 between the turn-on time of the first light emission control signal PAM_EM and the turn-on time of the second light emission control signal PWM_EM.

[0152] Optionally, the time difference dt2 between the activation times of the first light emission control signal PAM_EM and the second light emission control signal PWM_EM of at least two different sub-pixels is different. As can be seen from the above description of the pixel driving circuit's operation, in this embodiment of the invention, the second light emission control signal PWM_EM applied to the pulse width modulation module 10 can affect the timing at which the pulse width setting signal output by the pulse width modulation module 10 is provided to the amplitude modulation module 20. By differentially setting the time difference dt2 between the activation times of the first light emission control signal PAM_EM and the second light emission control signal PWM_EM of at least two different sub-pixels, the effective light emission time of the two sub-pixels can be differentially set. This allows for the adjustment of the brightness of the two sub-pixels by regulating their effective light emission times, thereby improving the brightness uniformity of the display panel.

[0153] For example, as shown in Figure 9, the time difference between the activation time of the first light emission control signal PAM_EM and the activation time of the second light emission control signal PWM_EM of the first sub-pixel is dt21, and the time difference between the activation time of the first light emission control signal PAM_EM and the activation time of the second light emission control signal PWM_EM of the second sub-pixel is dt22. dt21 ≠ dt22. Figure 9 uses dt21 > dt22 as an illustration.

[0154] Optionally, as shown in Figure 9, the pulse width of the enable level of the first emission control signal PAM_EM of the first sub-pixel is a1, the pulse width of the enable level of the first emission control signal PAM_EM of the second sub-pixel is a2, the pulse width of the enable level of the second emission control signal PWM_EM of the first sub-pixel is c1, the pulse width of the enable level of the second emission control signal PWM_EM of the second sub-pixel is c2, the time difference between the off time of the first emission control signal PAM_EM of the first sub-pixel and the off time of the second emission control signal PWM_EM is dt31, and the time difference between the off time of the first emission control signal PAM_EM of the second sub-pixel and the off time of the second emission control signal PWM_EM is dt32. Here, the off time refers to the moment when the corresponding signal switches from the enable level to the de-enable level. In this embodiment of the invention, c1 = c2, and dt31 = dt32. Based on this setting, when dt21≠dt22, a1≠a2 can be made, that is, the emission time of the first sub-pixel and the second sub-pixel can be differentiated.

[0155] Alternatively, in embodiments of the present invention, the time difference between the activation time of the first light emission control signal PAM_EM and the activation time of the second light emission control signal PWM_EM in at least two different states of the same sub-pixel can be made different, so that the effective light emission time of the sub-pixel in at least two different states is different, and the brightness of the sub-pixel in at least two different states is adjusted so that the two tend to be consistent, avoiding flickering problems caused by brightness differences.

[0156] In this embodiment of the invention, the time difference between the activation time of the first light emission control signal PAM_EM and the activation time of the second signal of at least two different sub-pixels is different, so as to differentiate the light emission time of the two sub-pixels. This allows for adjustment of the brightness of the two sub-pixels by adjusting their light emission time, thereby improving the brightness uniformity of the display panel. Alternatively, the time difference between the activation time of the first light emission control signal PAM_EM and the activation time of the second signal of the same sub-pixel in at least two different states is different, so that the light emission time of the sub-pixel in at least two different states is different, thereby adjusting the brightness of the sub-pixel in at least two different states to make them more consistent and avoid flickering problems caused by brightness differences. The second signal 2 includes the aforementioned sweep frequency signal SWEEP and / or the second light emission control signal PWM_EM.

[0157] For example, in this embodiment of the invention, the activation time of the sweep signal SWEEP is no later than the activation time of the first light-emitting control signal PAM_EM. Figures 6 and 9 illustrate this by showing that the activation time of the sweep signal SWEEP is earlier than the activation time of the first light-emitting control signal PAM_EM. Alternatively, the activation time of the sweep signal SWEEP can be made simultaneous with the activation time of the first light-emitting control signal PAM_EM. Based on this setting, it can be ensured that when the first light-emitting control signal PAM_EM is at the enable level controlling the third light-emitting control transistor M11 and the fourth light-emitting control transistor M12 to be turned on, the sweep signal SWEEP has already been turned on, that is, the sweep signal SWEEP has entered the signal change period. Therefore, it can be ensured that when the first light-emitting control signal PAM_EM is at the enable level controlling the third light-emitting control transistor M11 and the fourth light-emitting control transistor M12 to be turned on, the driving current generated by the second driving transistor M7 can be determined solely by the conduction state of the second driving transistor M7 to flow through the light-emitting element 12. The conduction state of the second driving transistor M7 is affected by the pulse width setting signal output by the pulse width modulation module 10. Whether the pulse width setting signal is output is affected by the second light emission control signal PWM_EM and the sweep frequency signal SWEEP. For example, when the second light emission control signal PWM_EM is at the enable level and controls the first light emission control transistor M6 and the second light emission control transistor M5 to be turned on, the pulse width modulation module 10 outputs the pulse width setting signal to the amplitude modulation module 20.

[0158] For example, as shown in FIG10, FIG10 is a schematic diagram of a display panel provided in an embodiment of the present invention. The display panel includes a display area, which includes a plurality of sub-display areas, and the sub-display areas include the aforementioned sub-pixels. In the embodiment of the present invention, the sub-pixels of at least two different sub-display areas respectively include the aforementioned first time and second time.

[0159] Taking a plurality of sub-display areas A, including at least a first sub-display area A1 and a second sub-display area A2, as an example, in this embodiment of the invention, the first sub-display area A1 includes a first time, and the second sub-display area A2 includes a second time. That is, the sub-pixels in the first sub-display area A1 include the first time, and the sub-pixels in the second sub-display area A2 include the second time. In other words, the light-emitting time of the sub-pixels in the first sub-display area A1 is different from the light-emitting time of the sub-pixels in the second sub-display area A2; or, when the sub-pixels have the circuit structure shown in FIG. 5, the turn-on time of the first light-emitting control signal PAM_EM of the sub-pixels in the first sub-display area A1 is different from the turn-on time of the first light-emitting control signal PAM_EM of the sub-pixels in the second sub-display area A2.

[0160] In this embodiment of the invention, the division of sub-display area A can be based on the light-emitting time of different areas in the display panel. Multiple sub-pixels within the same sub-display area A can emit light simultaneously, while sub-pixels located in different sub-display areas A can emit light at different times. As shown in Figure 10, the display panel includes a first sub-display area A1, a second sub-display area A2, a third sub-display area A3, and a fourth sub-display area A4. The sub-pixels in the first sub-display area A1, the second sub-display area A2, the third sub-display area A3, and the fourth sub-display area A4 emit light at different times.

[0161] For example, in an embodiment of the present invention, as shown in FIG10, the display panel includes a plurality of display units 30 arranged repeatedly along a first direction h1. Each display unit 30 includes the aforementioned plurality of sub-display areas A that emit light at different times. As shown in FIG10, the plurality of display units 30 includes at least a first display unit 301 and a second display unit 302. The first display unit 301 includes a first sub-display area A1, a second sub-display area A2, a third sub-display area A3, and a fourth sub-display area A4. The second display unit 302 includes the first sub-display area A1, the second sub-display area A2, the third sub-display area A3, and the fourth sub-display area A4. The plurality of first sub-display areas A1 can emit light simultaneously, the plurality of second sub-display areas A2 can emit light simultaneously, the plurality of third sub-display areas A3 can emit light simultaneously, and the plurality of fourth sub-display areas A3 can emit light simultaneously.

[0162] This invention, by dividing the display area of ​​the display panel into multiple sub-display areas and illuminating different sub-display areas simultaneously, avoids the problem of excessive voltage drop caused by excessive load on the first power signal line due to simultaneous illumination of all sub-pixels in the display panel. The first power signal line is used to transmit the aforementioned first power signal PAM_PVDD. Based on this configuration, the load on the first power signal line can be reduced, thereby reducing the voltage drop of the first power signal PAM_PVDD during transmission, which is beneficial for improving the display uniformity of the display panel.

[0163] Furthermore, by having the sub-pixels of at least two different sub-display areas A respectively include the first time and the second time, the brightness of the sub-pixels of at least two different sub-display areas A can be made to be consistent when driving the display panel, which is beneficial to improving the brightness consistency of different areas of the display panel.

[0164] For example, in this embodiment of the invention, the display area includes multiple first sub-display areas and multiple second sub-display areas, with at least one second sub-display area between any two adjacent first sub-display areas. As shown in FIG10, two adjacent first sub-display areas A1 can be separated by a second sub-display area A2, a third sub-display area A3, and a fourth sub-display area A4, and two adjacent second sub-display areas A21 can be separated by a third sub-display area A3, a fourth sub-display area A4, and a first sub-display area A1. That is, there are different sub-display areas A that emit light at other times and are spaced apart from each other when emitting light simultaneously. Based on this arrangement, the emitting sub-display areas A are not concentrated in one area, but are distributed in at least two display units 30, which is beneficial to further improve the uniformity of the displayed image.

[0165] Optionally, in this embodiment of the invention, each sub-display area A may include a single pixel row, or may include multiple pixel rows 3 arranged adjacent to each other in the first direction h1.

[0166] As shown in Figure 11, which is a schematic diagram of a display unit provided in an embodiment of the present invention, the display unit 30 includes a first sub-display area A1, a second sub-display area A2, a third sub-display area A3 and a fourth sub-display area A4, and each sub-display area includes a pixel row 3.

[0167] Alternatively, as shown in Figure 12, which is a schematic diagram of another display panel provided in an embodiment of the present invention, the first sub-display area A1 can also include m pixel rows. For example, following the top-to-bottom order of the display panel, the first sub-display area A1 includes the first pixel row to the m-th pixel row, the second sub-display area A2 includes the (m+1)-n-th pixel row, and the third sub-display area A3 includes the (n+1)-p-th pixel row. Where m is an integer greater than or equal to 1, n is an integer greater than or equal to m, and p is an integer greater than or equal to n.

[0168] When driving the display panel, for example, referring to Figures 5 and 13, Figure 13 is a timing diagram of a display panel provided by an embodiment of the present invention. In this embodiment of the present invention, different pixel rows 3 can receive the same first amplitude scan signal PAM_S1 and different pixel rows 3 can receive the same second amplitude scan signal PAM_S2, so as to simplify the driving timing of the display panel and reduce the number of first amplitude scan signals PAM_S1 and second amplitude scan signals PAM_S2 required for the display panel to work.

[0169] Optionally, in embodiments of the present invention, multiple pixel rows 3 in the same sub-display area A may receive the same sweep frequency signal SWEEP, the same second light emission control signal PWM_EM, and the same first light emission control signal PAM_EM, so that multiple pixel rows 3 in the same sub-display area A emit light simultaneously. Compared with the method of having different pixel rows 3 receive different signals, the driving timing of the display panel can be simplified, and the number of sweep frequency signal SWEEP, second light emission control signal PWM_EM, and first light emission control signal PAM_EM required for the operation of the display panel can be reduced.

[0170] As shown in Figure 13, when the display panel is displaying, the driving process of the display panel includes a first data writing stage D1 and a first light emission stage E1 corresponding to the first sub-display area A1, a second data writing stage D2 and a second light emission stage E2 corresponding to the second sub-display area A2, and a third data writing stage D3 and a third light emission stage E3 corresponding to the third sub-display area A3.

[0171] The first data writing stage D1, the second data writing stage D2, and the third data writing stage D3 all include a first data signal writing stage DA and a second data signal writing stage DW. To distinguish them, in Figure 13, the first data signal writing stage in the first data writing stage D1 is labeled as DA1, the first data signal writing stage in the second data writing stage D2 is labeled as DA2, and the first data signal writing stage in the third data writing stage D3 is labeled as DA3; and the second data signal writing stage in the first data writing stage D1 is labeled as DW1, the second data signal writing stage in the second data writing stage D2 is labeled as DW2, and the second data signal writing stage in the third data writing stage D3 is labeled as DW3.

[0172] During the first data signal writing stage DA1, the first amplitude scan signal PAM_S1 and the second amplitude scan signal PAM_S2 are enabled successively. When the second amplitude scan signal PAM_S2 is enabled, the second data writing transistor M9 and the second compensation transistor M10 are turned on, and the first data signal PAM_DATA is written to the gate of the second driving transistor M7 through the second data writing transistor M9 and the second compensation transistor M10, and threshold compensation is performed.

[0173] During the second data signal writing stage DW1, the first pulse width scanning signal PWM_S1 and the second pulse width scanning signal PWM_S2 in the m sub-pixel rows of the first sub-display area A1 are enabled line by line. Then, the first light emission stage E1 begins. In the first light emission stage E1, the second light emission control signal PWM_EM[A1] and the first light emission control signal PAM_EM[A1] in the first sub-display area A1 are enabled, and the m sub-pixel rows in the first sub-display area A1 emit light. The duration of the driving current flowing through the sub-pixels is related to the written second data signal PWM_DATA and the sweep frequency signal SWEEP.

[0174] Then, the second data writing stage D2, the second light emission stage D2, the third data writing stage D3, and the third light emission stage are driven sequentially, and the driving process of each stage is similar to that of the corresponding stage of the first sub-display area A1.

[0175] In this embodiment of the invention, as shown in FIG13, the first sub-display area A1 includes a first time a1, and the second sub-display area A2 includes a second time a2, wherein the first time a1 and the second time a2 are different. Based on this setting, the brightness variation problem caused by the different light emission times of the first sub-display area A1 and the second sub-display area A2, as well as factors such as driving signal fluctuations and threshold voltage characteristic drift of the driving transistor, can be compensated by using different first and second times, thereby improving the brightness consistency of the first sub-display area A1 and the second sub-display area A2.

[0176] Figure 13 uses the first time a1 as the light emission time of the sub-pixel in the first sub-display area A1 and the second time a2 as the light emission time of the sub-pixel in the second sub-display area A2. That is, the first time a1 is the pulse width of the enable level of the first light emission control signal PAM_EM as an illustration, and the second time a2 is the pulse width of the enable level of the first light emission control signal PAM_EM as an illustration. Of course, the first time can also be the turn-on time of the first light emission control signal PAM_EM of the sub-pixel in the first sub-display area A1, and the second time can be the turn-on time of the first light emission control signal PAM_EM of the sub-pixel in the second sub-display area A2.

[0177] As shown in Figure 13, the third sub-display area A3 includes a third time a3. Figure 13 uses the third time a3 as the light emission time of the sub-pixels in the third sub-display area A3, that is, the third time a3 is the pulse width of the enable level of the first light emission control signal PAM_EM as an illustration. The third time a3 is different from the first time a1 and the second time a2.

[0178] In Figure 13, "i" in the first pulse width scanning signal PWM_S1[i] and the second pulse width scanning signal PWM_S2[i] is the sequence number of the pixel row where the pixel driving circuit is located. The first pulse width scanning signal PWM_S1[i] of the pixel driving circuit in the i-th row can be the same as the second pulse width scanning signal PWM_S2[i_1] of the pixel driving circuit in the i-1-th row.

[0179] In the sweep frequency signal SWEEP[j], the second light emission control signal PWM_EM[j], and the first light emission control signal PAM_EM[j], j represents the sequence number of the sub-display area where the pixel driving circuit is located. Taking the pixel driving circuit located in sub-display area A1 as an example, the above signal terminals of the pixel driving circuit are the sweep frequency signal SWEEP[A1], the second light emission control signal PWM_EM[A1], and the first light emission control signal PAM_EM[A1], respectively. That is, multiple pixel driving circuits in a sub-display area share a single sweep frequency signal SWEEP, a single second light emission control signal PWM_EM, and a single first light emission control signal PAM_EM, so that multiple sub-pixels in the same sub-display area emit light simultaneously.

[0180] For example, the sub-pixels also receive a second signal; in this embodiment of the invention, in at least one sub-display area, the time difference between the activation time of the first emission control signal PAM_EM and the activation time of the second signal of at least two different sub-pixels is the same. When the second signal includes the sweep frequency signal SWEEP and / or the second emission control signal PWM_EM, as shown in FIG13, in the first sub-display area A1, the activation time of the first emission control signal PAM_EM of each sub-pixel is the same, and the activation time of the second signal of each sub-pixel is also the same, so the time difference between them is also the same. In the second sub-display area A2, the activation time of the first emission control signal PAM_EM of each sub-pixel is the same, and the activation time of the second signal of each sub-pixel is also the same, so the time difference between them is also the same. In the third sub-display area A3, the activation time of the first emission control signal PAM_EM of each sub-pixel is the same, and the activation time of the second signal of each sub-pixel is also the same, so the time difference between them is also the same. Based on this configuration, while ensuring the uniformity of display across different sub-display areas, multiple sub-pixels within the same sub-display area can receive the same first light emission control signal PAM_EM, as well as the same second signal, which helps simplify the driving timing of the display panel.

[0181] In this embodiment of the invention, as shown in FIG13, the first sub-display area A1 and the second sub-display area A2 receive different sweep frequency signals SWEEP. Under the action of different sweep frequency signals SWEEP, the sub-pixels in the first sub-display area A1 and the second sub-display area A2 can have different light emission times, which is beneficial to improving the brightness consistency of the sub-pixels in the first sub-display area A1 and the second sub-display area A2.

[0182] For example, multiple sub-pixels in the same sub-display area share a single sweep frequency signal SWEEP to achieve brightness uniformity in different sub-display areas while reducing the number of sweep frequency signals SWEEP required for the display panel to operate, thereby reducing the driving complexity of the display panel.

[0183] For example, as shown in Figure 6, the sweep frequency signal SWEEP includes a signal change period ΔT, and the sweep frequency signal SWEEP has a rate of change within the signal change period ΔT.

[0184] In this embodiment of the invention, the sweep frequency signal SWEEP includes a first sweep frequency signal SWEEP[A1] and a second sweep frequency signal SWEEP[A2]. The first sub-display area A1 receives the first sweep frequency signal SWEEP[A1], and the second sub-display area A2 receives the second sweep frequency signal SWEEP[A2]. As shown in Figure 14, which is a timing diagram of another display panel provided in this embodiment of the invention, the rate of change of the first sweep frequency signal SWEEP[A1] during the signal change period is different from the rate of change of the second sweep frequency signal SWEEP[A2] during the signal change period.

[0185] As can be seen from the above t31=(V3-V1) / k-dt1, the embodiments of the present invention can differentiate the slope k of the sweep frequency signal SWEEP provided to different sub-display areas, thereby differentiating the effective light emission time t31 of the sub-pixels in different sub-display areas. In this way, the brightness of the sub-pixels in different sub-display areas can be adjusted by adjusting the effective light emission time in different sub-display areas.

[0186] As shown in Figure 14, the third sub-display area A3 receives the third sweep frequency signal SWEEP[A3]. The rate of change of the third sweep frequency signal SWEEP[A3] during the signal change period is different from the rates of change of the first sweep frequency signal SWEEP[A1] and the second sweep frequency signal SWEEP[A2] during the signal change period. Figure 14 illustrates this by showing that the rate of change of the first sweep frequency signal SWEEP[A1] during the signal change period is greater than that of the second sweep frequency signal SWEEP[A2], and the rate of change of the second sweep frequency signal SWEEP[A2] during the signal change period is greater than that of the third sweep frequency signal SWEEP[A3].

[0187] For example, as shown in Figure 6, the swept frequency signal SWEEP has a difference ΔV between its maximum and minimum values ​​during the signal variation period. SWEEP △V SWEEP =V3-V2. In this embodiment of the invention, as shown in FIG14, the difference between the first sweep frequency signal SWEEP[A1] and the second sweep frequency signal SWEEP[A2] is different. As shown in FIG14, the first sweep frequency signal SWEEP[A1] has a first difference ΔV during the signal change period. SWEEP1 The second sweep frequency signal SWEEP[A2] has a second difference ΔV during the signal change period. SWEEP2 The first difference △V SWEEP1 The second difference △V SWEEP2 different.

[0188] Combining the above, t31=(V3-V1) / k-dt1, k=(V3-V2) / b=△V SWEEP As can be seen from / b, the embodiments of the present invention provide the difference ΔV of the sweep frequency signal SWEEP to different sub-display areas through differentiated settings. SWEEP The effective light emission time t31 of sub-pixels in different sub-display areas can be set differently, thereby adjusting the brightness of sub-pixels in different sub-display areas by adjusting the effective light emission time of different sub-display areas.

[0189] As shown in Figure 14, the third sub-display area A3 receives the third sweep frequency signal SWEEP[A3]. The third sweep frequency signal SWEEP[A3] has a third difference value ΔV during the signal change period. SWEEP3 The third difference △V SWEEP3 The difference with the first value △V SWEEP1 The second difference △V SWEEP2 They are all different. Figure 14 shows the first difference ΔV. SWEEP1 Greater than the second difference △V SWEEP2 The second difference △V SWEEP2 Greater than the third difference △V SWEEP3 As an illustration.

[0190] For example, in an embodiment of the present invention, as shown in FIG15, FIG15 is a timing diagram of another display panel provided in an embodiment of the present invention, wherein the duration of the first sweep signal SWEEP[A1] during the signal change period is different from the duration of the second sweep signal SWEEP[A2] during the signal change period. As shown in FIG15, the duration of the first sweep signal SWEEP[A1] during the signal change period is a first duration b1, and the duration of the second sweep signal SWEEP[A2] during the signal change period is a second duration b2, wherein the first duration b1 and the second duration b2 are different.

[0191] Combining the above t31=(V3-V1) / k-dt1,k=(V3-V2) / b, it can be seen that the embodiments of the present invention can differentiate the duration b of the sweep frequency signal SWEEP provided to different sub-display areas during the signal change period, thereby differentiating the effective light emission time t31 of the sub-pixels in different sub-display areas. In this way, the brightness of the sub-pixels in different sub-display areas can be adjusted by adjusting the effective light emission time in different sub-display areas.

[0192] As shown in Figure 15, the third sub-display area A3 receives the third sweep frequency signal SWEEP[A3]. The duration of the third sweep frequency signal SWEEP[A3] during the signal change period is the third duration b3. The third duration b3 is different from both the first duration b1 and the second duration b2. Figure 15 illustrates this with the first duration b1 being greater than the second duration b2, and the second duration b2 being greater than the third duration b3.

[0193] For example, in this embodiment of the invention, the time difference between the activation time of the sweep frequency signal SWEEP and the activation time of the first light emission control signal PAM_EM in any two adjacent sub-display areas is different. Based on this setting, different sub-display areas A can adjust the time difference between the activation time of the received sweep frequency signal SWEEP and the activation time of the first light emission control signal PAM_EM according to their respective light emission times, so that the light emission time of any two adjacent sub-display areas matches their light emission times. This allows for more precise adjustment of the actual brightness of each sub-display area A, which is beneficial for further improving the display consistency of the display panel.

[0194] Optionally, in embodiments of the present invention, the time difference between the activation time of the sweep frequency signal SWEEP and the activation time of the first light emission control signal PAM_EM of any two sub-display areas A can be made different, so as to adjust the display uniformity of different sub-display areas A.

[0195] For example, according to the scanning order of the sub-display areas, the time difference between the activation time of the SWEEP sweep frequency signal and the activation time of the first light emission control signal PAM_EM in different sub-display areas gradually increases or gradually decreases. The scanning order refers to the time sequence in which the data writing stage described above is performed. For instance, in Figure 13, multiple sub-display areas are scanned sequentially in the order of first sub-display area A1, second sub-display area A2, and third sub-display area A3. Therefore, in this embodiment of the invention, the time difference between the activation time of the SWEEP sweep frequency signal and the activation time of the first light emission control signal PAM_EM received by the first sub-display area A1, second sub-display area A2, and third sub-display area A3 can be made to gradually increase or gradually decrease sequentially. Based on this setting, the influence of different scanning orders on the actual brightness of each sub-display area A can be compensated, further improving the display uniformity of the display panel.

[0196] Optionally, the time difference between the activation time of the second light-emitting control signal PWM_EM and the activation time of the first light-emitting control signal PAM_EM for any two adjacent sub-display areas can be different. Based on this setting, any two adjacent sub-display areas can adjust the time difference between the activation times of the second light-emitting control signal PWM_EM and the first light-emitting control signal PAM_EM according to their respective light-emitting times. This allows the light-emitting time of any two adjacent sub-display areas to match their respective light-emitting times, enabling more precise adjustment of the actual brightness of each sub-display area A, which is beneficial for further improving the display consistency of the display panel.

[0197] For example, in embodiments of the present invention, the time difference between the activation time of the second light emission control signal PWM_EM and the activation time of the first light emission control signal PAM_EM in any two sub-display areas can be different, so as to make targeted adjustments to the display uniformity of different sub-display areas A.

[0198] Optionally, according to the scanning order of the sub-display areas, the time difference dt2 between the activation time of the second light emission control signal PWM_EM and the activation time of the first light emission control signal PAM_EM in different sub-display areas gradually increases or gradually decreases. For example, in Figure 10, multiple sub-display areas are scanned sequentially in the order of the first sub-display area A1, the second sub-display area A2, and the third sub-display area A3. Therefore, in this embodiment of the invention, the time difference between the activation time of the second light emission control signal PWM_EM and the activation time of the first light emission control signal PAM_EM received by the first sub-display area A1, the second sub-display area A2, and the third sub-display area A3 can be gradually increased or gradually decreased. Based on this setting, the influence of the different scanning order on the actual brightness of each sub-display area can be compensated, further improving the display uniformity of the display panel.

[0199] For example, when driving the display panel, embodiments of the present invention can first compare the brightness of at least two different sub-pixels. This brightness is the actual brightness of the sub-pixel. The actual brightness can be detected by a brightness detection instrument. When the brightness of one sub-pixel is less than the brightness of the other sub-pixel, embodiments of the present invention can make the first time of one sub-pixel greater than the second time of the other sub-pixel, thereby increasing the light-emitting time of one sub-pixel and decreasing the light-emitting time of the other sub-pixel, so that the difference in actual brightness after adjustment is reduced, for example, making the actual brightness of the two sub-pixels equal after adjustment, thereby improving the display uniformity of the display panel.

[0200] For example, taking a display panel including a first sub-display area A1 and a second sub-display area A2 as shown in FIG. 10, when driving the display panel, this embodiment of the invention can first compare the initial brightness of the sub-pixels in the first sub-display area A1 and the second sub-display area A2. When the initial brightness of the sub-pixels in the first sub-display area A1 is less than the initial brightness of the sub-pixels in the second sub-display area A2, this embodiment of the invention can adjust the first time corresponding to the first sub-display area A1 to be greater than the second time corresponding to the second sub-display area A2, so that the actual brightness difference of the sub-pixels in the first sub-display area A1 and the second sub-display area A2 is reduced after adjustment.

[0201] For example, in this embodiment of the invention, at least two different sub-pixels have the same target brightness. The target brightness is the ideal brightness that the sub-pixels in the two regions are expected to achieve. When the target brightness of sub-pixels in two different regions is the same, the above method can compensate for the influence of factors such as different emission times or threshold voltage drift on the actual brightness of the sub-pixels in the two different regions, reducing the difference in actual brightness between the sub-pixels in the two different regions, thereby improving the display effect and avoiding uneven display problems.

[0202] Optionally, embodiments of the present invention can also compare the brightness of the same sub-pixel in different states; when the brightness of a sub-pixel in one state is less than the brightness in another state, the first time of the sub-pixel in one state is made greater than the second time of the sub-pixel in another state, so as to reduce the difference in the actual brightness of the sub-pixel in the two different states.

[0203] For example, in this embodiment of the invention, the target brightness of the same sub-pixel is the same in different states. The target brightness is the ideal brightness that the sub-pixel is expected to achieve in both states. When the target brightness of a sub-pixel is the same in two different states, the above method can compensate for the influence of factors such as different emission times or threshold voltage drift on the actual emission brightness, reducing the difference in actual brightness between the two sub-pixels in different states, thereby improving the display effect and avoiding uneven display problems.

[0204] Based on the same inventive concept, this embodiment of the invention also provides a display device, as shown in FIG16. FIG16 is a schematic diagram of a display device provided by an embodiment of the present invention, the display device including the display panel 100 described above. The specific structure of the display panel 100 has been described in detail in the above embodiments and will not be repeated here. Of course, the display device shown in FIG16 is merely illustrative, and the display device can be any electronic device with display function, such as a mobile phone, in-vehicle display screen, tablet computer, laptop computer, e-reader, or television set.

[0205] Based on the same inventive concept, embodiments of the present invention also provide a driving method for a display panel, which is applied to the aforementioned display panel, and the driving method includes:

[0206] The control display panel includes at least a first time and a second time, wherein the first time and the second time are different; wherein,

[0207] The first time and the second time are the emission times of different sub-pixels;

[0208] Alternatively, the first time and the second time are the activation times of the first light emission control signal for different sub-pixels;

[0209] Alternatively, the first time and the second time can be the emission time of the same sub-pixel in different states;

[0210] Alternatively, the first time and the second time are the activation times of the first light emission control signal of the same sub-pixel in different states.

[0211] When the first time and the second time are the light-emitting times of different sub-pixels in the display panel, or the turn-on times of the first light-emitting control signals of different sub-pixels in the display panel, the embodiments of the present invention can compensate for the brightness differences caused by different light-emitting times or different threshold voltage offsets of different sub-pixels by making the first time and the second time different, which is beneficial to improving the display consistency of different areas of the display panel.

[0212] In the case that the first time and the second time are the light emission times of the same sub-pixel in different states, or the first time and the second time are the activation times of the first light emission control signal of the same sub-pixel in different states, the embodiments of the present invention can avoid the flickering problem caused by the different brightness of the display panel at different times by making the first time and the second time different.

[0213] Optionally, the above-mentioned driving method for the display panel further includes: comparing the brightness of at least two different sub-pixels; when the brightness of one sub-pixel is less than the brightness of the other sub-pixel, making the first time of one sub-pixel greater than the second time of the other sub-pixel, so as to increase the light emission time of one sub-pixel and decrease the light emission time of the other sub-pixel, so as to reduce the actual brightness difference between the two after adjustment, for example, to make the actual brightness of the two sub-pixels equal after adjustment, thereby improving the display uniformity of the display panel.

[0214] For example, taking at least two different sub-pixels including a first sub-pixel and a second sub-pixel, where the brightness of the first sub-pixel is less than the brightness of the second sub-pixel, as shown in Figure 9, in this embodiment of the invention, the pulse width of the enable level of the first emission control signal PAM_EM of the first sub-pixel can be made less than the pulse width of the enable level of the first emission control signal PAM_EM of the second sub-pixel, that is, let a1 < a2.

[0215] Optionally, as shown in Figure 9, in this embodiment of the invention, the time difference between the turn-on time of the first light emission control signal PAM_EM and the turn-on time of the second light emission control signal PWM_EM of the first sub-pixel can be greater than the time difference between the turn-on time of the first light emission control signal PAM_EM and the turn-on time of the second light emission control signal PWM_EM of the second sub-pixel, that is, let dt21 > dt22, and let the pulse width of the enable level of the second light emission control signal PWM_EM of the first sub-pixel be equal to the pulse width of the enable level of the second light emission control signal PWM_EM of the second sub-pixel, that is, let c1 = c2, and let the time difference between the turn-off time of the first light emission control signal PAM_EM and the turn-off time of the second light emission control signal PWM_EM of the first sub-pixel be equal to the time difference between the turn-off time of the first light emission control signal PAM_EM and the turn-off time of the second sub-pixel, that is, let dt31 = dt32, so as to achieve a1 < a2.

[0216] For example, in this embodiment of the invention, at least two different sub-pixels have the same target brightness. The target brightness is the ideal brightness that the sub-pixels in the two regions are expected to achieve. When the target brightness of two different sub-pixels is the same, the above method can compensate for the influence of factors such as different emission times or threshold voltage drift on the actual emission brightness, reducing the difference in actual brightness between the two different sub-pixels, thereby improving the display effect and avoiding uneven display problems.

[0217] For example, the above-mentioned driving method for the display panel further includes: comparing the brightness of the same sub-pixel in different states; when the brightness of the sub-pixel in one state is less than the brightness in another state, making the first time of the sub-pixel in one state greater than the second time of the sub-pixel in another state, so as to reduce the difference in the actual brightness of the two after adjustment.

[0218] Optionally, in this embodiment of the invention, the target brightness of the same sub-pixel is the same in different states. The target brightness is the ideal brightness that the sub-pixel is expected to achieve in both periods. When the target brightness is the same in two different states, the above method can compensate for the influence of factors such as different emission times or threshold voltage drift on the actual emission brightness, reducing the difference in the actual brightness of the sub-pixel in the two states, thereby improving the display effect and avoiding display abnormalities such as flickering.

[0219] 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.

[0220] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended 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 therein. Such 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 display panel, characterized in that, It includes multiple sub-pixels; each sub-pixel receives a first light emission control signal; The display panel includes at least a first time and a second time, wherein the first time and the second time are different; wherein... The first time and the second time are the emission times of different sub-pixels, respectively; Alternatively, the first time and the second time are respectively the turn-on times of the first light emission control signal for different sub-pixels; Alternatively, the first time and the second time may be the emission times of the same sub-pixel in different states; Alternatively, the first time and the second time may be the activation times of the first light emission control signal of the same sub-pixel in different states.

2. The display panel according to claim 1, characterized in that, Under the same target grayscale, the first time and the second time are different.

3. The display panel according to claim 1, characterized in that, The sub-pixel also receives a second signal; The time difference between the activation time of the first light emission control signal and the activation time of the second signal of at least two different sub-pixels is different; Alternatively, the time difference between the activation time of the first light emission control signal and the activation time of the second signal of the same sub-pixel in at least two different states is different.

4. The display panel according to claim 3, characterized in that, The sub-pixel includes a pulse width modulation module and an amplitude modulation module, wherein the amplitude modulation module corresponds to the first light emission control signal and the pulse width modulation module corresponds to the second signal.

5. The display panel according to claim 4, characterized in that, The sub-pixel includes an electrically connected pixel driving circuit and a light-emitting element; The pixel driving circuit includes a second driving transistor, the pulse width modulation module, and the amplitude modulation module; The second driving transistor is used to output a driving current according to the signal at the gate of the second driving transistor and the signal at the first terminal of the second driving transistor; The pulse width modulation module outputs a pulse width setting signal to the first terminal of the amplitude modulation module based on the frequency sweep signal and the second light emission control signal, so as to control the light emission time of the light emission element; The amplitude modulation module is used to control the light-emitting element to emit light in response to the driving current under the control of the first light emission control signal.

6. The display panel according to claim 5, characterized in that, The second signal includes the frequency sweep signal.

7. The display panel according to claim 6, characterized in that, The activation time of the frequency sweep signal is no later than the activation time of the first light emission control signal.

8. The display panel according to claim 6, characterized in that, The operation of the sub-pixel includes a data writing stage and a light emission stage. During the data writing phase, the sweep frequency signal is at a high level; during a portion of the light emission phase, the sweep frequency signal decreases linearly from a high level.

9. The display panel according to claim 6, characterized in that, The working process of the sub-pixel includes a data writing stage and a light emission stage; During the data writing phase, the sweep signal is at a low level; during a portion of the light emission phase, the sweep signal jumps from a low level to a high level and then linearly decreases from the high level.

10. The display panel according to claim 5, characterized in that, The second signal includes the second light emission control signal.

11. The display panel according to claim 1, characterized in that, The display panel includes multiple sub-display areas, and the multiple sub-display areas include at least a first sub-display area and a second sub-display area. The first sub-display area includes the first time, and the second sub-display area includes the second time.

12. The display panel according to claim 11, characterized in that, The sub-pixel also receives a second signal; In at least one of the sub-display areas, the time difference between the activation time of the first light emission control signal and the activation time of the second signal of at least two different sub-pixels is the same.

13. The display panel according to claim 11, characterized in that, The sub-pixel includes an electrically connected pixel driving circuit and a light-emitting element; The pixel driving circuit includes a pulse width modulation module, an amplitude modulation module, and a driving transistor; The pulse width modulation module outputs a pulse width setting signal to the first terminal of the amplitude modulation module based on the frequency sweep signal and the second emission control signal. The driving transistor is used to output a driving current according to the signal at the gate of the driving transistor and the signal at the first terminal of the driving transistor. The amplitude modulation module is used to control the light-emitting element to emit light in response to the driving current under the control of the first light emission control signal, and output the pulse width setting signal to the gate of the driving transistor to control the light emission time of the light-emitting element; The first sub-display area and the second sub-display area receive different sweep frequency signals.

14. The display panel according to claim 13, characterized in that, Multiple sub-pixels in the same sub-display area share a single sweep frequency signal.

15. The display panel according to claim 13, characterized in that, The frequency sweep signal includes a first frequency sweep signal and a second frequency sweep signal. The first sub-display area receives the first frequency sweep signal, and the second sub-display area receives the second frequency sweep signal. The frequency sweep signal includes a signal change period, and the rate of change of the first frequency sweep signal during the signal change period is different from the rate of change of the second frequency sweep signal during the signal change period.

16. The display panel according to claim 15, characterized in that, The swept frequency signal has a difference between the maximum and minimum values ​​during the signal variation period. The difference between the first frequency sweep signal and the difference between the second frequency sweep signal are different.

17. The display panel according to claim 15, characterized in that, The duration of the first sweep frequency signal during the signal change period is different from the duration of the second sweep frequency signal during the signal change period.

18. The display panel according to claim 13, characterized in that, The display panel includes a plurality of first sub-display areas and a plurality of second sub-display areas, wherein at least one second sub-display area is included between two adjacent first sub-display areas.

19. The display panel according to claim 13, characterized in that, The time difference between the activation time of the sweep frequency signal and the activation time of the first light emission control signal in any two adjacent sub-display areas is different.

20. The display panel according to claim 19, characterized in that, According to the scanning order of the sub-display areas, the time difference between the activation time of the sweep frequency signal and the activation time of the first light emission control signal in different sub-display areas gradually increases or gradually decreases.

21. The display panel according to claim 13, characterized in that, The time difference between the activation time of the second light emission control signal and the activation time of the first light emission control signal in any two adjacent sub-display areas is different.

22. The display panel according to claim 21, characterized in that, According to the scanning order of the sub-display areas, the time difference between the activation time of the second light emission control signal and the activation time of the first light emission control signal in different sub-display areas gradually increases or gradually decreases.

23. The display panel according to claim 1, characterized in that, Compare the brightness of at least two different sub-pixels. When the brightness of one of the sub-pixels is less than the brightness of the other sub-pixel, The first time of one of the sub-pixels is greater than the second time of the other sub-pixel.

24. The display panel according to claim 23, characterized in that, At least two different sub-pixels have the same target brightness.

25. The display panel according to claim 1, characterized in that, Compare the brightness of the same sub-pixel under different states; When the brightness of a sub-pixel is less in one state than in another state, The first time of a sub-pixel in one state is greater than the second time of the sub-pixel in the other state.

26. The display panel according to claim 25, characterized in that, The target brightness of the same sub-pixel is the same in different states.

27. A display device, characterized in that, Includes the display panel as described in any one of claims 1-26.

28. A driving method for a display panel, applied to the display panel according to any one of claims 1-26, characterized in that, The driving method includes: Controlling the display panel includes at least a first time and a second time, wherein the first time and the second time are different; wherein, The first time and the second time are the emission times of different sub-pixels, respectively; Alternatively, the first time and the second time are respectively the turn-on times of the first light emission control signal of different sub-pixels; Alternatively, the first time and the second time may be the emission times of the same sub-pixel in different states; Alternatively, the first time and the second time may be the activation times of the first light emission control signal of the same sub-pixel in different states.

29. The driving method according to claim 28, characterized in that, Compare the brightness of at least two different sub-pixels. When the brightness of one of the sub-pixels is less than the brightness of the other sub-pixel, The first time of one of the sub-pixels is greater than the second time of the other sub-pixel.

30. The driving method according to claim 29, characterized in that, At least two different sub-pixels have the same target brightness.

31. The driving method according to claim 28, characterized in that, Compare the brightness of the same sub-pixel under different states; When the brightness of a sub-pixel is less in one state than in another state, The first time of a sub-pixel in one state is greater than the second time of the sub-pixel in the other state.

32. The driving method according to claim 31, characterized in that, The target brightness of the same sub-pixel is the same in different states.

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