Display device and driving method therefor

Abstract

Disclosed are a display device and a driving method. The display device comprises multiple sub-pixels and a driving circuit. The driving circuit is connected to the multiple sub-pixels, and is used for: at a first frequency, using each frame as a refresh frame to generate a driving signal of the refresh frame, and applying the generated driving signal of the refresh frame and a data signal to the multiple sub-pixels of the display device; and at a second frequency, taking N consecutive frames including a refresh frame and N-1 hold frames as one group, generating a driving signal of the refresh frame and a driving signal of the N-1 hold frames for each group, and applying the generated driving signal of the refresh frame and the generated driving signal of the hold frames to the multiple sub-pixels, wherein N is the ratio of the first frequency to the second frequency, and N is an integer greater than 1. The driving circuit is further used for: in response to receiving an instruction to switch from the first frequency to the second frequency, for the next group of N consecutive frames, adjusting a driving signal of the first n hold frames relative to a driving signal of a refresh frame, wherein 1≤n≤N-1.

Description

Display device and driving method thereof Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device and a driving method for the display device. Background Art

[0002] With the development of technology, some display devices have multi-frequency display capabilities and can switch between different frequencies as needed. For example, in actual application, when the finger touches or refreshes the screen, the frequency will switch to high frequency, and when the finger has not touched for a period of time and there is no screen refresh, it will switch to low frequency, which can maximize power saving. However, frequency switching may cause the display brightness to be inconsistent before and after switching. For example, low-temperature polycrystalline oxide (LTPO) display devices, especially LTPO 2.0 display devices, may appear transiently slightly brighter or darker when switching frequency, and then reach steady-state brightness, affecting the visual effect.

[0003] Summary of the Invention

[0004] Embodiments of the present disclosure provide an electronic device and a driving method of the electronic device.

[0005] According to one aspect of the present disclosure, there is provided a display device, including:

[0006] a plurality of sub-pixels arranged in an array comprising rows and columns;

[0007] a driving circuit connected to the plurality of sub-pixels and configured to, at a first frequency, generate a driving signal for a refresh frame with each frame as a refresh frame, and apply the generated driving signal for the refresh frame and a data signal to the plurality of sub-pixels of the display device, so that the plurality of sub-pixels receive the data signal and emit light under the control of the driving signal for the refresh frame; and, at a second frequency, generate a driving signal for the refresh frame and a driving signal for N-1 holding frames for each group, with N consecutive frames including a refresh frame and N-1 holding frames as a group, and apply the generated driving signal for the refresh frame and the driving signal for the holding frame to the plurality of sub-pixels, so that the plurality of sub-pixels receive the data signal and emit light under the control of the driving signal for the refresh frame, and hold the received data signal and emit light under the control of the driving signal for the holding frame, wherein N is a ratio of the first frequency to the second frequency, and N is an integer greater than 1;

[0008] The driving circuit is further configured to adjust the driving signals of the first n hold frames relative to the driving signals of the refresh frames in the next group of N consecutive frames in response to receiving an instruction to switch from the first frequency to the second frequency, where 1≤n≤N-1.

[0009] For example, the adjustment performed by the driving circuit includes: adjusting the driving signal of the first n holding frames according to the display brightness value currently set by the display device, wherein the larger the display brightness value, the larger the adjustment amount.

[0010] For example, the adjustment performed by the driving circuit includes: adjusting the driving signals of the first n holding frames so that the adjustment amount of the driving signal of the n1th holding frame is greater than the adjustment amount of the driving signal of the n2th holding frame, where 1≤n1≤n2≤n.

[0011] For example, the driving signal includes at least one of a light-emitting control signal, a first initial voltage, a second initial voltage, a power supply voltage, and a reference voltage. The light-emitting control signal is used to control the sub-pixel to emit light. The first initial voltage is used to initialize the first electrode voltage of the light-emitting element of the sub-pixel. The second initial voltage is used to initialize the input terminal voltage of the driving transistor of the sub-pixel for driving the light-emitting element. The power supply voltage and the reference voltage are used to power the sub-pixel.

[0012] For example, the driving signal includes a light-emitting control signal, and the adjustment performed by the driving circuit includes: adjusting the waveform parameters of the light-emitting control signal of the first n holding frames relative to the waveform parameters of the light-emitting control signal of the refresh frame, so that the waveform parameters of the light-emitting control signal of the first n holding frames are adjusted to be smaller than the waveform parameters of the light-emitting control signal of the refresh frame, and the waveform parameters include at least one of the effective level duration and amplitude.

[0013] For example, when the display brightness value is 200 nit to 900 nit, the adjustment amount of the effective level duration of the light emitting control signal of the frame is maintained to be 4 to 12 rows of sub-pixels / pulse.

[0014] For example, when the display brightness value is 200 nit to 900 nit, the adjustment amount of the effective level duration of the light-emitting control signal of the first holding frame is 8 to 12 rows of sub-pixels / pulse, and the adjustment amount of the effective level duration of the light-emitting control signal of the second holding frame is 4 to 8 rows of sub-pixels / pulse.

[0015] For example, when the display brightness value is 10 nit to 200 nit, the adjustment amount of the effective level duration of the light emitting control signal of the frame is maintained to be 4 to 8 rows of sub-pixels / pulse.

[0016] For example, when the display brightness value is 10nit to 200nit, the adjustment amount of the effective level duration of the light-emitting control signal of the first holding frame is 4 to 8 rows of sub-pixels / pulse, and the adjustment amount of the effective level duration of the light-emitting control signal of the second holding frame is 0 to 4 rows of sub-pixels / pulse.

[0017] For example, the driving signal includes a first initial voltage (VINIT2), and the adjustment performed by the driving circuit includes:

[0018] adjusting a first initial voltage of an N-1th holding frame among the N-1 holding frames so that the first initial voltage of the N-1th holding frame is positively biased relative to the first initial voltage of the refresh frame;

[0019] The first initial voltages of the first n holding frames among the N-1 holding frames are adjusted so that the first initial voltages of the first n holding frames are positively biased relative to the first initial voltage of the N-1th holding frame.

[0020] For example, the driving signal includes a second initial voltage (VINIT3), and the adjustment performed by the driving circuit includes:

[0021] adjusting the second initial voltage of the N-1th holding frame among the N-1 holding frames so that the second initial voltage of the N-1th holding frame is positively biased relative to the second initial voltage of the refresh frame;

[0022] The second initial voltages of the first n holding frames among the N-1 holding frames are adjusted so that the second initial voltages of the first n holding frames are negatively biased relative to the second initial voltage of the N-1th holding frame.

[0023] For example, the driving signal includes at least one of the power supply voltage and the reference voltage, and the adjustment performed by the driving circuit includes: adjusting at least one of the power supply voltage and the reference voltage of the first n holding frames so that the absolute difference between the power supply voltage and the reference voltage of the first n holding frames is less than the absolute difference between the power supply voltage and the reference voltage of the refresh frame.

[0024] For example, the adjustment performed by the driving circuit further includes: adjusting the power supply voltage and the reference voltage of the first n holding frames equally so that the adjustment amount of the absolute difference between the power supply voltage and the reference voltage is twice the adjustment amount of the power supply voltage and the reference voltage.

[0025] For example, when N=2, n=1; when N is greater than 2, n=2.

[0026] For example, the driving circuit is further configured to adjust the driving signal of the next one or more refresh frames relative to the driving signal of the last maintained frame in the current group of N consecutive frames in response to receiving an instruction to switch from the second frequency to the first frequency.

[0027] For example, the driving signal includes at least one of a light emitting control signal, a first initial voltage, a second initial voltage, a power supply voltage, and a reference voltage, and the driving circuit adjusts the driving signal of the next one or more refresh frames by at least one of the following:

[0028] Adjusting the effective level duration of the light emitting control signal of the next one or more refresh frames so that the effective level duration of the light emitting control signal of the refresh frame is greater than the effective level duration of the light emitting control signal of the hold frame;

[0029] adjusting the first initial voltage of the next one or more refresh frames so that the first initial voltage of the next one or more refresh frames is negatively biased relative to the first initial voltage of the hold frame;

[0030] adjusting the second initial voltage of the next one or more refresh frames so that the second initial voltage of the next one or more refresh frames is positively biased relative to the second initial voltage of the hold frame;

[0031] Adjust at least one of the power signal and the reference signal of the next one or more refresh frames so that the absolute value of the difference between the power signal and the reference signal of the next one or more refresh frames is greater than the absolute value of the difference between the power signal and the reference signal of the hold frame.

[0032] For example, the driving circuit includes:

[0033] a gate driving circuit connected to the plurality of sub-pixels and configured to generate a gate driving signal and a light emitting control signal;

[0034] The driving control circuit is connected to the gate driving circuit and the plurality of sub-pixels, and is used to control the gate driving circuit to generate the gate driving signal and the light-emitting control signal, apply the data signal to the plurality of sub-pixels, and perform the adjustment on the light-emitting control signal.

[0035] For example, the driving control circuit is further configured to provide a first initial voltage and / or a second initial voltage, and perform the adjustment on the first initial voltage and / or the second initial voltage.

[0036] For example, the driving circuit further includes a power supply circuit for providing a power supply voltage and a reference voltage to the sub-pixels, and the driving control circuit is further configured to control the power supply circuit to adjust at least one of the power supply voltage and the reference voltage.

[0037] For example, the sub-pixel includes a pixel driving circuit and a light-emitting element, and the pixel driving circuit includes:

[0038] A driving subcircuit, comprising a control terminal, an input terminal and an output terminal;

[0039] a storage sub-circuit connected between the control terminal of the driving sub-circuit and a power signal terminal for receiving a power voltage;

[0040] an input sub-circuit connected to the input terminal of the driving sub-circuit, and configured to provide a data signal to the input terminal of the driving sub-circuit under the control of a first gate driving signal;

[0041] an input control subcircuit connected between the output terminal of the driving subcircuit and the control terminal, and configured to electrically connect the output terminal of the driving subcircuit and the control terminal under the control of the second gate driving signal;

[0042] a light-emitting control subcircuit, connected between the driving subcircuit and the power signal terminal and between the driving subcircuit and the light-emitting element, and configured to conduct a path from the power signal terminal through the driving subcircuit to the light-emitting element under the control of a light-emitting control signal;

[0043] an initialization subcircuit connected to the input end of the driving subcircuit, the output end of the driving subcircuit, and the first pole of the light-emitting element, for initializing the voltages of the input end of the driving subcircuit, the output end of the driving subcircuit, and the first pole of the light-emitting element, wherein the second pole of the light-emitting element is connected to a reference signal end for receiving a reference voltage.

[0044] For example, the driving subcircuit includes a driving transistor, the gate of the driving transistor serves as the control terminal of the driving subcircuit, the first electrode of the driving transistor serves as the input terminal of the driving subcircuit, and the second electrode of the driving transistor serves as the output terminal of the driving subcircuit.

[0045] For example, the storage sub-circuit includes a capacitor, a first electrode of the capacitor is connected to the control terminal of the driving sub-circuit, and a second electrode of the second electrode of the storage sub-circuit intercepts the power signal terminal.

[0046] For example, the input sub-circuit includes a first transistor (T4), a gate of the first transistor is configured to receive a first gate drive signal, a first electrode of the first transistor is configured to receive a data signal, and a second electrode of the first transistor is connected to an input terminal of the drive sub-circuit;

[0047] The input control subcircuit includes a second transistor, a gate of the second transistor is configured to receive a second gate drive signal, a first electrode of the second transistor is connected to the output end of the drive subcircuit, and a second electrode of the second transistor is connected to the control end of the drive subcircuit.

[0048] For example, the light-emitting control subcircuit includes a third transistor (T5) and a fourth transistor (T6), the gate of the third transistor is configured to receive a light-emitting control signal, the first electrode of the third transistor is connected to the power signal terminal, and the second electrode of the third transistor is connected to the input terminal of the driving subcircuit; the gate of the fourth transistor is configured to receive a light-emitting control signal, the first electrode of the fourth transistor is connected to the output terminal of the driving subcircuit, and the second electrode of the fourth transistor is connected to the first electrode of the light-emitting element.

[0049] For example, the initialization sub-circuit includes a fifth transistor, a sixth transistor, and a seventh transistor, wherein:

[0050] The gate of the fifth transistor (T7) is configured to receive a first reset signal, the first electrode of the fifth transistor is configured to receive a first initial voltage (VINIT2), and the second electrode of the fifth transistor is connected to the first electrode of the light emitting element;

[0051] The gate of the sixth transistor (T8) is configured to receive a first reset signal, the first electrode of the sixth transistor is configured to receive a second initial voltage (VINIT3), and the second electrode of the sixth transistor is connected to the input terminal of the driving sub-circuit;

[0052] The gate of the seventh transistor (T1) is configured to receive a second reset signal, the first electrode of the seventh transistor is configured to receive a third initial voltage (VINIT1), and the second electrode of the seventh transistor is connected to the output terminal of the driving sub-circuit.

[0053] According to another aspect of the present disclosure, a driving method for a display device is provided, comprising:

[0054] At a first frequency, taking each frame as a refresh frame to generate a refresh frame driving signal, and applying the generated refresh frame driving signal and a data signal to a plurality of sub-pixels of a display device, so that the plurality of sub-pixels receive the data signal and emit light under the control of the refresh frame driving signal;

[0055] At the second frequency, taking N consecutive frames including a refresh frame and N-1 hold frames as a group, generating a drive signal for a refresh frame and a drive signal for N-1 hold frames for each group, and applying the generated drive signal for the refresh frame and the drive signal for the hold frame to the plurality of sub-pixels, so that the plurality of sub-pixels receive data signals and emit light under the control of the drive signal for the refresh frame, and maintain the received data signals and emit light under the control of the drive signal for the hold frame, wherein N is a ratio of the first frequency to the second frequency, and N is an integer greater than 1;

[0056] The method further includes: in response to receiving an instruction to switch from the first frequency to the second frequency, in the next group of N consecutive frames, adjusting the drive signals of the first n hold frames relative to the drive signals of the refresh frames, where 1≤n≤N-1.

[0057] For example, adjusting the driving signal of the first n holding frames relative to the driving signal of the refresh frame includes: adjusting the driving signal of the first n holding frames according to the display brightness value currently set by the display device, wherein the larger the display brightness value, the greater the adjustment amount.

[0058] For example, adjusting the drive signals of the first n hold frames relative to the drive signal of the refresh frame includes: adjusting the drive signals of the first n hold frames so that the adjustment amount of the drive signal of the n1th hold frame is greater than the adjustment amount of the drive signal of the n2th hold frame, where 1≤n1≤n2≤n.

[0059] For example, the driving signal includes at least one of a light-emitting control signal, a first initial voltage, a second initial voltage, a power supply voltage, and a reference voltage. The light-emitting control signal is used to control the sub-pixel to emit light. The first initial voltage is used to initialize the first electrode voltage of the light-emitting element of the sub-pixel. The second initial voltage is used to initialize the input terminal voltage of the driving transistor of the sub-pixel for driving the light-emitting element. The power supply voltage and the reference voltage are used to power the sub-pixel.

[0060] For example, when N=2, n=1; when N is greater than 2, n=2.

[0061] For example, the method further includes: in response to receiving an instruction to switch from the second frequency to the first frequency, adjusting the drive signal of the next one or more refresh frames relative to the drive signal of the last hold frame in the current group of N consecutive frames.

[0062] For example, the driving signal includes at least one of a light emitting control signal, a first initial voltage, a second initial voltage, a power supply voltage, and a reference voltage. The driving signal for adjusting the next one or more refresh frames relative to the driving signal of the last maintained frame among the current group of N consecutive frames includes at least one of the following:

[0063] Adjusting the effective level duration of the light emitting control signal of the next one or more refresh frames so that the effective level duration of the light emitting control signal of the next one or more refresh frames is greater than the effective level duration of the light emitting control signal of the last hold frame;

[0064] Adjusting the first initial voltage of the next one or more refresh frames so that the first initial voltage of the next one or more refresh frames is negatively biased relative to the first initial voltage of the last hold frame;

[0065] Adjusting the second initial voltage of the next one or more refresh frames so that the second initial voltage of the next one or more refresh frames is positively biased relative to the second initial voltage of the last hold frame;

[0066] Adjust at least one of the power signal and the reference signal of the next one or more refresh frames so that the absolute value of the difference between the power signal and the reference signal of the next one or more refresh frames is greater than the absolute value of the difference between the power signal and the reference signal of the last hold frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] FIG1 shows a schematic block diagram of a display device according to an embodiment of the present disclosure;

[0068] FIG2 shows an example circuit diagram of a sub-pixel according to an embodiment of the present disclosure;

[0069] FIG3 is a schematic diagram showing the working principle of a display device at different frequencies according to an embodiment of the present disclosure;

[0070] FIG4A shows a signal timing diagram of the sub-pixel in FIG2 during a refresh frame;

[0071] FIG4B shows a signal timing diagram of the sub-pixel in FIG2 during a hold frame;

[0072] FIG5 shows a diagram showing brightness changes of a display device during frequency switching;

[0073] FIG6 is a schematic diagram showing adjustment of the effective level duration of the light emitting control signal by the display device according to an embodiment of the present disclosure;

[0074] FIG7 shows the adjustment of the effective level duration of the light emitting control signal by the display device at different display brightness values ​​according to an embodiment of the present disclosure;

[0075] FIG8 is a schematic diagram showing adjustment of the amplitude of a light emitting control signal by a display device according to an embodiment of the present disclosure;

[0076] FIG. 9 is a schematic diagram showing adjustment of the first initial voltage and the second initial voltage by a display device according to an embodiment of the present disclosure.

[0077] FIG10 shows a schematic flowchart of a driving method of a display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0078] While the present disclosure will be fully described with reference to the accompanying drawings that contain preferred embodiments of the present disclosure, it should be understood before this description that one of ordinary skill in the art may modify the disclosure described herein while still achieving the technical benefits of the present disclosure. Therefore, it should be understood that the above description is intended to be a broad disclosure for one of ordinary skill in the art and is not intended to limit the exemplary embodiments described herein.

[0079] In addition, in the following detailed description, for ease of explanation, numerous specific details are set forth to provide a comprehensive understanding of the disclosed embodiments. However, it is apparent that one or more embodiments can be practiced without these specific details. In other cases, well-known structures and devices are shown in diagrammatic form to simplify the accompanying drawings.

[0080] FIG1 shows a schematic diagram of a display device according to an embodiment of the present disclosure.

[0081] As shown in FIG1 , the display device includes a plurality of sub-pixels P and a driving circuit 100. The plurality of sub-pixels P can be arranged in the form of an array including rows and columns, for example, can be arranged in an N×M array, where N and M are both integers greater than 1. The driving circuit 100 is connected to the plurality of sub-pixels P and is used to apply driving signals and data signals to the plurality of sub-pixels P, for example, applying driving signals G1 to GN to each row of sub-pixels P, and applying data signals D1 to DM (hereinafter collectively referred to as data signals Data) to each column of sub-pixels P. Each sub-pixel P can receive a data signal and emit light under the control of the received driving signal.

[0082] In some embodiments, the drive signal applied by the drive circuit 100 to each sub-pixel P may be a set of signals, including but not limited to a gate drive signal, a light-emitting control signal, an initial voltage, a power supply voltage, a reference voltage, and the like. The gate drive signal is used to control the sub-pixel to turn on in order to receive a data signal or maintain an already received data signal. The light-emitting control signal is used to control the sub-pixel to emit light. The initial voltage may include at least one of a first initial voltage and a second initial voltage. The first initial voltage is used to initialize the first electrode voltage of the light-emitting element of the sub-pixel, and the second initial voltage is used to initialize the input terminal voltage of the driving transistor of the sub-pixel for driving the light-emitting element. The power supply voltage and the reference voltage are used to power the sub-pixel.

[0083] The following will take the circuit structure of the sub-pixel P shown in FIG. 2 as an example to describe various driving signals in detail.

[0084] As shown in FIG2 , a sub-pixel may include a light-emitting element EL and a pixel driving circuit for driving the light-emitting element EL to emit light. The pixel driving circuit may include a driving sub-circuit 210, a storage sub-circuit 220, an input sub-circuit 230, an input control sub-circuit 240, a light-emitting control sub-circuit 250, and an initialization sub-circuit 260. The pixel driving circuit may generate a driving current based on a data signal Data under the control of a driving signal, thereby driving the light-emitting element EL to emit light. The driving signals applied to the pixel driving circuit include, but are not limited to, gate driving signals (e.g., a first gate driving signal PGate, a second gate driving signal Gate_N), a light-emitting control signal EM, a first reset signal H_Reset, a second reset signal P_Reset, a first initial voltage VINTI1, a second initial voltage VINIT2, a third initial voltage VINIT3, a power supply voltage ELVDD, a reference voltage ELVSS, and the like. This will be described in detail below with reference to FIG2 .

[0085] The driving sub-circuit 210 may include a control terminal, an input terminal, and an output terminal. For example, the driving sub-circuit 210 may include a driving transistor DTF, a gate of the driving transistor DTF may serve as the control terminal of the driving sub-circuit 210, a first electrode of the driving transistor DTF may serve as the input terminal of the driving sub-circuit 210, and a second electrode of the driving transistor DTF may serve as the output terminal of the driving sub-circuit 210.

[0086] The storage sub-circuit 220 is connected between the control terminal of the driver sub-circuit and a power signal terminal for receiving a power supply voltage. For example, the storage sub-circuit 220 may include a capacitor C1, a first electrode of which is connected to the control terminal of the driver sub-circuit 210, and a second electrode of the capacitor C2 is connected to a power signal terminal for providing a power supply voltage ELVDD (hereinafter, for ease of description, the power signal terminal is also represented by ELVDD).

[0087] The input sub-circuit 230 is connected to the input terminal of the driver sub-circuit 210. The input sub-circuit 230 can provide the data signal Data to the input terminal of the driver sub-circuit under the control of the first gate drive signal PGate. For example, the input sub-circuit 230 may include a first transistor T1, the gate of the first transistor T1 being configured to receive the first gate drive signal PGate, the first electrode of the first transistor T1 being configured to receive the data signal Data, and the second electrode of the first transistor T1 being connected to the input terminal of the driver sub-circuit 210, for example, the first electrode of the driver transistor DTF.

[0088] The input control subcircuit 240 is connected between the output terminal and the control terminal of the driver subcircuit. The input control subcircuit 240 can electrically connect the output terminal and the control terminal of the driver subcircuit 210 under the control of the second gate drive signal. For example, the input control subcircuit 240 may include a second transistor T2. The gate of the second transistor T2 is configured to receive the second gate drive signal Gate_N. The first electrode of the second transistor T2 is connected to the output terminal of the driver subcircuit 210, for example, to the second electrode of the driver transistor DTF. The second electrode of the second transistor T2 is connected to the control terminal of the driver subcircuit 210, for example, to the gate of the driver transistor DTF.

[0089] The light-emission control subcircuit 250 is connected between the driver subcircuit 210 and the power signal terminal ELVDD, and between the driver subcircuit 210 and the light-emitting element. Under the control of a light-emission control signal EM, the light-emission control subcircuit 250 can conduct a path from the power signal terminal ELVDD through the driver subcircuit to the light-emitting element. For example, the light-emission control subcircuit 250 may include a third transistor T3 and a fourth transistor T4. The gate of the third transistor T3 is configured to receive the light-emission control signal EM, a first electrode of the third transistor T3 is connected to the power signal terminal ELVDD, and a second electrode of the third transistor T3 is connected to an input terminal of the driver subcircuit 210, such as the first electrode of the driver transistor DTF. The gate of the fourth transistor T4 is configured to receive the light-emission control signal EM, a first electrode of the fourth transistor T4 is connected to an output terminal of the driver subcircuit 210, such as the second electrode of the driver transistor DTF, and a second electrode of the fourth transistor T4 is connected to a first electrode of the light-emitting element EL, such as the anode of the light-emitting element EL.

[0090] The initialization subcircuit 260 is connected to the input terminal of the driver subcircuit 210, the output terminal of the driver subcircuit 210, and the input terminal of the light-emitting element EL. The initialization subcircuit 260 can initialize the voltages at the input terminal of the driver subcircuit 210, the output terminal of the driver subcircuit 210, and the first electrode of the light-emitting element EL. The second electrode (e.g., the cathode) of the light-emitting element EL is connected to a reference signal terminal for receiving a reference voltage ELVSS (hereinafter, for ease of description, the reference signal terminal is also represented by ELVSS). For example, the initialization subcircuit 260 may include a fifth transistor T5, a sixth transistor T6, and a seventh transistor T7. The gate of the fifth transistor T5 is configured to receive a first reset signal H_Reset, the first electrode of the fifth transistor T5 is configured to receive a first initialization voltage VINIT1, and the second electrode of the fifth transistor T5 is connected to the first electrode of the light-emitting element EL. The gate of the sixth transistor T6 is configured to receive the first reset signal H_Reset, the first electrode of the sixth transistor T6 is configured to receive a second initialization voltage VINIT2, and the second electrode of the sixth transistor T6 is connected to the input terminal of the driver subcircuit 210, for example, the first electrode of the driver transistor DTF. The gate of the seventh transistor T7 is configured to receive the second reset signal P_Reset, the first electrode of the seventh transistor T7 is configured to receive the third initial voltage VINIT3, and the second electrode of the seventh transistor T7 is connected to the output end of the driving sub-circuit 210, for example, connected to the second electrode of the driving transistor DTF.

[0091] In the above embodiment, transistors T1, T3-T7 may all be P-type transistors, and transistor T2 may be an N-type transistor. However, the embodiments of the present disclosure are not limited thereto, and the type of transistors may be selected as needed.

[0092] An example of the circuit structure of the sub-pixel in an embodiment of the present disclosure is described above with reference to FIG2 . However, this is only for illustrating the effects of various driving signals. The embodiments of the present disclosure are not limited thereto, and the sub-pixel may adopt any suitable circuit structure as needed.

[0093] Referring back to FIG1 , in some embodiments, the driving circuit 100 may include a gate driving circuit 110 and a driving control circuit 120. The gate driving circuit 110 is connected to a plurality of sub-pixels P. The gate driving circuit 110 may generate a gate driving signal and a light-emitting control signal, for example, generating the first gate driving signal PGate and the second gate driving signal Gate_N and the light-emitting control signal EM as described above. A plurality of sub-pixels P may be arranged in a display area of ​​the display panel, and the gate driving circuit 110 may be a gate driver array circuit (GOA, Gate Driver on Array) arranged in a peripheral area of ​​the display panel to implement a progressive scanning driving function. The driving control circuit 120 is connected to the gate driving circuit 110 and a plurality of sub-pixels P. For example, the driving control circuit 120 may be a driving control chip (Driver IC), which is electrically connected to the gate driving circuit 110 and a plurality of sub-pixels P on the display panel by bonding. The drive control circuit 120 may control the gate drive circuit 110 to generate gate drive signals (e.g., a first gate drive signal PGate and a second gate drive signal Gate_N) and a light-emission control signal (e.g., a light-emission control signal EM), and may apply a data signal Data to the plurality of sub-pixels P. In some embodiments, the drive control circuit 120 may further provide initial voltages to the plurality of sub-pixels P, such as, but not limited to, any one or more of the first initial voltage VINIT1, the second initial voltage VINIT2, and the third initial voltage VINIT3 described above.

[0094] In some embodiments, the driving circuit 100 may further include a power circuit 130 for providing a power supply voltage ELVDD and a reference voltage ELVSS to the sub-pixels P. The power circuit 130 may be implemented as a Power IC, for example, implemented by a Power IC in a main control unit of an electronic device. The driving control circuit 120 may control the power circuit 130 to adjust at least one of the power supply voltage ELVDD and the reference voltage ELVSS provided to the sub-pixels P.

[0095] According to an embodiment of the present disclosure, a display device may have a multi-frequency display function. For example, it may display at a first frequency or at a second frequency. The second frequency may be different from the first frequency, for example, the first frequency may be an integer multiple of the second frequency. The so-called frequency here may refer to the refresh frequency of the display device. The display device may implement multi-frequency display by inserting hold frames between refresh frames. For example, the driving circuit 100 can generate a driving signal for a refresh frame at a first frequency, with each frame as a refresh frame, and apply the generated driving signal for the refresh frame and the data signal to multiple sub-pixels of the display device, so that the multiple sub-pixels receive the data signal and emit light in parallel under the control of the driving signal for the refresh frame; at a second frequency, with N consecutive frames including a refresh frame and N-1 holding frames as a group, generate a driving signal for the refresh frame and a driving signal for N-1 holding frames for each group, and apply the generated driving signal for the refresh frame and the driving signal for the holding frame to the multiple sub-pixels, so that the multiple sub-pixels receive the data signal and emit light under the control of the driving signal for the refresh frame, and maintain the received data signal and emit light under the control of the driving signal for the holding frame, where N is the ratio of the first frequency to the second frequency, and N is an integer greater than 1.

[0096] FIG3 is a schematic diagram showing the working principle of a display device at different frequencies according to an embodiment of the present disclosure.

[0097] As shown in FIG3 , assuming that the maximum refresh frequency (i.e., the base frequency) of the display device is 120 Hz, then when the display device operates at a frequency of 120 Hz, each frame is a refresh frame, and the driving circuit of the display device generates a driving signal for each refresh frame. When the display device operates at a frequency of 60 Hz, the driving circuit can take a refresh frame and a hold frame as a group, and periodically generate a group of driving signals for the refresh frame and a group of driving signals for the hold frame. In the refresh frame, the sub-pixel receives the data signal under the control of the driving signal of the refresh frame and displays based on the received data signal, that is, the driving circuit controls the sub-pixel to "refresh" the display data; in the hold frame, the sub-pixel maintains the received data signal under the control of the driving signal of the hold frame and displays based on the maintained data signal, that is, the driving circuit controls the sub-pixel to "maintain" the display data. Thus, at 120Hz, since each frame is a refresh frame, that is, each frame is "refreshed", the highest refresh rate is achieved; at 60Hz, since each refresh frame is followed by a hold frame, a frame is "refreshed" every two frames, achieving half of the highest frequency, that is, a refresh rate of 60Hz. Similarly, at 40Hz, each refresh frame is followed by two hold frames, thus reducing the refresh rate to one-third of the maximum frequency of 120Hz; at 30Hz, each refresh frame is followed by three hold frames, thus reducing the refresh rate to one-quarter of the maximum frequency of 120Hz.

[0098] 4A and 4B respectively illustrate driving signals of the sub-pixel in FIG. 2 in a refresh frame and a hold frame.

[0099] As shown in Figure 4A, in the refresh frame, in the period t1, the second gate drive signal Gate_N is at a high level, and the first reset signal H_Reset is at a low level. Combined with Figure 2, the second transistor T2, the fifth transistor T5 and the sixth transistor T6 are turned on, thereby providing the first initial voltage VINIT1 to the first electrode of the light emitting element EL and providing the second initial voltage VINIT2 to the first electrode of the driving transistor DTF.

[0100] In time period t2, the first reset signal H_Reset becomes a high level, the second reset signal P_Reset becomes a low level, the second gate drive signal Gate_N is a high level, the fifth transistor T5 and the sixth transistor T6 are turned off, and the second transistor T2 and the seventh transistor T7 are turned on, thereby writing the third initial voltage VINIT3 into the gate of the driving transistor DTF, and the third initial voltage VINIT3 turns on the driving transistor DTF.

[0101] In period t3, the second reset signal P_Reset becomes a high level, the first gate drive signal PGate is a low level, the second gate drive signal Gate_N remains high, the seventh transistor T7 is turned off, the first transistor T1 is turned on, and the second transistor T2 remains turned on. The data signal Data is written into the gate of the driving transistor DTF via the turned-on driver DTF and the second transistor T2.

[0102] During period t4, the first gate drive signal PGate becomes high, the second gate drive signal Gate_N becomes low, and the second transistor T2 and the first transistor T1 are both turned off. The first reset signal H_Reset is low, turning on the fifth transistor T5 and the sixth transistor T6, again supplying the first initial voltage VINIT1 to the first electrode of the light-emitting element EL and the second initial voltage VINIT2 to the first electrode of the driving transistor DTF.

[0103] During period t5, the first reset signal H_Reset is at a high level, turning off the fifth and sixth transistors T5 and T6. The light-emission control signal EM becomes low, turning on the third and fourth transistors T3 and T4, thereby conducting a path from the power supply signal terminal ELVDD through the drive transistor DTF to the light-emitting element EL. The drive transistor DTF generates a drive current based on the data signal written to its gate. The generated drive current is supplied to the first electrode of the light-emitting element EL via the turned-on fourth transistor T4, thereby driving the light-emitting element EL to emit light. At this point, the display drive of the refresh frame is completed.

[0104] As shown in Figure 4B, in the hold frame, the signal waveforms of the light-emitting control signal EM, the first reset signal H_Reset, and the second reset signal P_Reset are the same as those in the refresh frame. Unlike the refresh frame, the first gate drive signal PGate maintains a high level and the second gate drive signal Gate_N maintains a low level. In other words, in the hold frame, the first transistor T1 and the second transistor T2 remain in the off state. In this way, the data signal written to the gate of the drive transistor DTF will be maintained at the gate of the drive transistor DTF due to the presence of the capacitor C1. Whenever the light-emitting control signal EM reaches a low level, the drive transistor DTF generates a drive current based on the data signal maintained at its gate to drive the light-emitting element EL to emit light. In this way, the display drive of the hold frame is achieved.

[0105] When switching from high frequency to low frequency, the refresh frame suddenly changes to a hold frame. Since the first transistor T1 and the second transistor T2 in the hold frame remain in the off state and no data is written, the signal timing suddenly changes at the switching moment. The load drop and hysteresis of the display device will cause the brightness change of the switching transient, making the brightness of the hold frame higher than that of the refresh frame. Conversely, when switching from low frequency to high frequency, the hold frame suddenly changes to the refresh frame, and the brightness of the refresh frame will be lower than that of the previous hold frame.

[0106] As shown in Figure 5, taking the switch from 120Hz to 30Hz as an example, in the 120Hz working mode, each frame is used as a refresh frame for display driving; in the 30Hz working mode, the first frame of every four consecutive frames is used as a refresh frame, and the third to fourth frames are used as hold frames, that is, one refresh frame and three hold frames are used as a group for display driving. When switching from 120Hz to 30Hz, due to the influence of the load drop and hysteresis of the screen, the refresh frame suddenly changes to a hold frame. The brightness of the second and third frames (i.e., the first two hold frames) will be higher than that of the first frame (i.e., the refresh frame), and the degree of increase is different (the brightness difference between the second frame and the first frame is greater than the brightness difference between the third frame and the first frame); the brightness starts to return to stability from the fourth frame.

[0107] According to an embodiment of the present disclosure, the driving circuit in the display device can, in response to receiving an instruction to switch from the first frequency to the second frequency, adjust the driving signal of the first n holding frames relative to the driving signal of the refresh frame in the next group of N consecutive frames, where N is the ratio of the first frequency to the second frequency, 1≤n≤N-1. The driving circuit in the display device can also, in response to receiving an instruction to switch from the second frequency to the first frequency, adjust the driving signal of the next one or more refresh frames relative to the driving signal of the last holding frame in the current group of N consecutive frames. In this way, the brightness change at the moment of frequency switching as described above can be compensated.

[0108] In some embodiments, the driving circuit can adjust the driving signal according to the display brightness value (DBV, Dsiplay Brightness Value) currently set by the display device (for example, when switching from the first frequency to the second frequency, adjusting the driving signal of the first n holding frames after the next refresh frame, and when switching from the second frequency to the first frequency, adjusting the driving signal of the next refresh frame), wherein the larger the display brightness value, the greater the adjustment amount. In some embodiments, the driving circuit can adjust the driving signal of the first n holding frames so that the adjustment amount of the driving signal of the n1th holding frame is greater than the adjustment amount of the driving signal of the n2th holding frame, wherein 1≤n1≤n2≤n. In some embodiments, when N=2, n=1. In some embodiments, when N is greater than 2, n=2.

[0109] The drive signal adjusted during frequency switching includes, but is not limited to, at least one of a light-emitting control signal, a first initial voltage, a second initial voltage, a power supply voltage, and a reference voltage. The light-emitting control signal is used to control the sub-pixel to emit light, and may include, but is not limited to, the light-emitting control signal EM described above. The first initial voltage is used to initialize the anode voltage of the light-emitting element of the sub-pixel, and may include, but is not limited to, the first initial voltage VINIT1 described above. The second initial voltage is used to initialize the input voltage of the drive transistor of the sub-pixel used to drive the light-emitting element, and may include, but is not limited to, the second initial voltage VINIT2 described above. The power supply voltage and the reference voltage are used to power the sub-pixel, and may include, but is not limited to, the power supply voltage ELVDD and the reference voltage ELVSS described above.

[0110] The compensation methods of various driving signals will be described in detail below with reference to FIG. 6 to FIG. 9 .

[0111] Taking the light control signal as an example, after receiving an instruction to switch from a first frequency to a second frequency, the driving circuit can adjust the waveform parameters of the light control signal of the first n holding frames relative to the waveform parameters of the light control signal of the refresh frame in the next group of N consecutive frames, so that the waveform parameters of the light control signal of the first n holding frames are adjusted to be smaller than the waveform parameters of the light control signal of the refresh frame. The adjusted waveform parameters include at least one of an effective level duration and an amplitude.

[0112] FIG6 is a schematic diagram showing the adjustment of the effective level duration of the light-emitting control signal by a display device according to an embodiment of the present disclosure. As shown in FIG6 , when switching from 120 Hz to 30 Hz, the driving mode is switched from each frame being a refresh frame to a group of 1 refresh frame and 3 hold frames. The driving circuit can adjust the effective level duration of the light-emitting control signal of the second frame (the first hold frame) and the third frame (the second hold frame) relative to the first frame (the refresh frame) for the next group of 4 consecutive frames. For example, assuming that the effective level duration of the light-emitting control signal of the first frame is d1, the effective level durations of the light-emitting control signal of the second and third frames are d2 and d3, respectively, where d2 and d3 are both less than d1.

[0113] Because the emission control signal EM controls the effective emission time of the subpixel, the measured brightness is actually equivalent to the integral of the total time during which the emission control signal EM remains at its active level (in this embodiment, the low-level time). Assuming that the active level duration of the emission control signal accounts for 60% of the entire signal cycle, that is, the subpixel's effective emission time under the control of the emission control signal is 60% and its non-emission time is 40%, and the brightness during the effective emission time is 150 nits, the actual measured brightness (average brightness) is 150 nits * 60% = 90 nits. Because the emission control signal EM has a very fast frequency (e.g., three pulses per frame), at a base frequency of 120 Hz, the EM frequency is 360 Hz. Under normal conditions, the human eye can perceive a continuous image at a speed of 24 frames per second, and the maximum frequency of a single color block flickering is generally considered to be 60 Hz. However, the frequency of the emission control signal EM far exceeds the range that the human eye can perceive, so the human eye can only discern the average brightness. The embodiments of the present disclosure can adjust the brightness of the display device by adjusting the active level duration of the emission control signal EM, thereby compensating for brightness variations caused by frequency switching.

[0114] In some embodiments, as shown in FIG6 , the effective level duration of the light-emitting control signal of the second and third frames can be reduced relative to d1, where (d1-d2)>(d1-d3), that is, the adjustment amount of the second frame is greater than that of the third frame. The effective level duration of the light-emitting control signal of the fourth frame can remain unchanged, that is, it is still d1. For example, in the case shown in FIG5 , the brightness changes of the second and third frames (i.e., the first two hold frames) are different from those of the first frame, where the brightness change of the second frame is greater than that of the third frame. Therefore, the compensation amount for the second frame (the first hold frame) can be greater than the compensation amount for the third frame (the second hold frame). By making the adjustment amount of the second frame greater than that of the third frame, the accuracy of the compensation can be further improved.

[0115] FIG. 7 illustrates adjustment of the effective level duration of the light emitting control signal by the display device at different display brightness values ​​according to an embodiment of the present disclosure.

[0116] As shown in FIG7 , the effective level duration of the EM control signal can be adjusted based on the display brightness value (DBV) currently set for the display device. The greater the display brightness value, the greater the adjustment amount. For example, assuming that the display brightness value DBV1 is in the range of 200 nits to 900 nits, the display brightness value DBV2 is in the range of 10 nits to 200 nits, and the display brightness value DBV3 is less than 10 nits. The reference value for the EM effective level duration can be represented by the number of rows of sub-pixels scanned within the duration of a unit pulse. For example, assuming that the total number of sub-pixel rows scanned in a frame is 3168, and at the display brightness value DBV1, the number of pulses (low-level pulses) of the EM control signal in a frame is 3, then the number of rows corresponding to each pulse is 3168 / 3 = 1056 rows. Therefore, 1056 rows per pulse can be used as the reference value D1 for the effective level duration of the EM control signal at the display brightness value DBV1. Similarly, when the display brightness value DBV3 is displayed, the number of pulses Num3 of the light-emitting control signal in one frame is 18, so the number of rows corresponding to each pulse is 3168 / 18=176 rows. 176 rows per pulse can be used as the reference value D3 of the effective level duration of the light-emitting control signal when the display brightness value DBV3 is displayed.

[0117] As shown in FIG7 , when switching from the first frequency to the second frequency, taking switching from 120 Hz to 30 Hz as an example, in the following four consecutive frames, the first frame is a refresh frame, and the second to fourth frames are all hold frames.

[0118] At the display brightness value DBV1, the effective level duration of the first frame (refresh frame) and the fourth frame (third hold frame) can be the same as the reference value D1, that is, the adjustment amount is 0. The effective level duration of the light control signal of the second frame (the first hold frame) and the third frame (the second hold frame) can be adjusted. For example, the adjustment amount for the second frame is Δd_21, and the adjustment amount for the third frame is Δd_31. That is, the effective level duration of the light control signal of the second frame (the first hold frame) is D1 + Δd_21, and the effective level duration of the light control signal of the third frame (the second hold frame) is D1 + Δd_31. Here, Δd_21 and Δd_31 can both be negative values, so that the effective level duration of the light control signal of the first hold frame and the second hold frame is less than the reference value D1, that is, less than the effective level duration of the light control signal of the refresh frame. In some embodiments, the absolute values ​​of Δd_21 and Δd_31 can be in the range of 8 to 12. In some embodiments, the absolute value of Δd_21 is greater than the absolute value of Δd_31, that is, the adjustment amount in the first hold frame is greater than the adjustment amount in the second hold frame, thereby achieving targeted compensation for step-like brightness changes, such as shown in Figure 5. For example, the absolute value of Δd_21 can be 8 to 12 rows of sub-pixels / pulse, and the absolute value of Δd_31 can be 4 to 8 rows of sub-pixels / pulse.

[0119] For example, assuming DBV1 is 500 nits at w255, the effective level duration (low-level time) of the light-emission control signal in frame 2 is reduced from the reference value of 1056 lines per pulse to 1044 lines per pulse (i.e., Δd_21 = -12), while the effective level duration of the light-emission control signal in frame 3 is adjusted from the reference value of 1056 lines per pulse to 1052 lines per pulse (Δd_21 = -4). Since the brightness change in frame 2 (the first hold frame) is large, the adjustment amount (i.e., compensation amount) is also large; since the brightness in frame 3 (the second hold frame) returns to a significant positive state, the adjustment amount (i.e., compensation amount) is relatively small.

[0120] Similarly, at display brightness value DBV2, when switching from the first frequency to the second frequency, the effective level duration of the first frame (refresh frame) and the fourth frame (third hold frame) is the same as reference value D2, that is, the adjustment amount is 0. The adjustment amounts of the effective level duration of the light emitting control signal in the second frame (first hold frame) and the third frame (second hold frame) are Δd_22 and Δd_32, respectively. Δd_22 and Δd_32 are also negative values. For example, the absolute values ​​of Δd_22 and Δd_32 are in the range of 0 to 8. The absolute value of Δd_22 can also be greater than the absolute value of Δd_32. For example, the absolute value of Δd_22 can be in the range of 4 to 8, and the absolute value of Δd_32 can be in the range of 0 to 4.

[0121] At display brightness value DBV3, when switching from the first frequency to the second frequency, the effective level duration of the first frame (refresh frame) and the fourth frame (third hold frame) is the same as reference value D3, that is, the adjustment amount is 0. The adjustment amounts of the effective level duration of the light control signal in the second frame (first hold frame) and the third frame (second hold frame) are Δd_23 and Δd_33, respectively. Δd_23 and Δd_33 are also negative values, and the absolute value of Δd_23 can also be greater than the absolute value of Δd_33. In some embodiments, the absolute values ​​of Δd_23 and Δd_33 can be in the range of 0 to 4. In some embodiments, the absolute value of Δd_23 can be in the range of 0 to 4, and Δd_33 can be 0.

[0122] A vertical comparison shows that for the same frame, the adjustment amount is different at different display brightness values. For example, if DBV1>DBV2>DBV3, then for the second frame (the first hold frame), the absolute value of Δd_21>the absolute value of Δd_22>the absolute value of Δd_23; and for the third frame (the second hold frame), the absolute value of Δd_31>the absolute value of Δd_32>the absolute value of Δd_33.

[0123] Different DBV settings on the display device result in different W255 brightness. The DBV value of a display device can be set in various ways. For example, a user can adjust the DBV of a mobile phone by sliding the brightness bar on the phone. Under different DBVs, the degree of brightness change when switching frequencies varies. By adjusting the drive signal based on the DBV, the embodiments of the present disclosure can further improve compensation accuracy.

[0124] FIG8 is a schematic diagram showing adjustment of the amplitude of a light emitting control signal by a display device according to an embodiment of the present disclosure.

[0125] As shown in FIG8 , taking the switch from 120 Hz to 30 Hz as an example, the driving mode is switched from each frame being a refresh frame to a group of one refresh frame and three hold frames. For the next group of four consecutive frames, the driving circuit can adjust the amplitudes of the light control signals for the second frame (the first hold frame) and the third frame (the second hold frame) relative to the first frame (the refresh frame). For example, assuming the amplitude of the light control signal for the first frame is V1, the amplitudes of the light control signals for the second and third frames can be adjusted relative to V1, for example, adjusting the amplitude of the second frame to V2 and the amplitude of the third frame to V3, where both V2 and V3 are less than V1. In some embodiments, as shown in FIG8 , the amplitudes of the light control signals for the second and third frames can be reduced relative to V1, where (V1-V2)>(V1-V3), meaning that the amplitude adjustment for the second frame is greater than the amplitude adjustment for the third frame. The amplitude of the light emitting control signal of the fourth frame may remain unchanged, that is, still be V1.

[0126] By fine-tuning the amplitude of the light-emitting control signal, taking the sub-pixel structure of Figure 2 as an example, the degree of opening of the third transistor T3 and the fourth transistor T4 can be adjusted, thereby adjusting the brightness. In some embodiments, the amplitude adjustment can be achieved by adjusting the amplitude of the low level of the light-emitting control signal. As shown in Figure 8, the amplitude of the light-emitting control signal is different, and its charging waveform is different. The larger the low level amplitude of the light-emitting control signal, the higher the degree of opening of the third transistor T3 and the fourth transistor T4, and the greater the brightness. By adjusting the amplitude of the light-emitting control signal of different frames, for example, adjusting the reference voltage (VGL voltage) of the gate drive circuit (GOA) corresponding to the light-emitting control signal, different brightness can be obtained. The drive control circuit can provide two or more reference voltages (for example, VGL1, VGL2, ...), and one of the reference voltages can be configured for use with the light-emitting control signal without affecting the voltage of other signals of the gate drive circuit.

[0127] In some embodiments, the adjustment of the active level duration and the amplitude of the light control signal can be combined. For example, if the adjustment of the active level duration of the light control signal for the third frame (the second hold frame) at a DBV of 500 nits does not meet the requirements, for example, the brightness of 12 lines minus is too low, while the brightness of 8 lines minus is still slightly high, the amplitude of the light control signal can also be adjusted to achieve more precise adjustment.

[0128] According to an embodiment of the present disclosure, brightness compensation can also be achieved by adjusting at least one of the first initial voltage and the second initial voltage when switching frequencies. For example, when switching from a first frequency to a second frequency, for the next set of N consecutive frames (1 refresh frame and N-1 hold frames), the first initial voltage of the N-1th hold frame among the N-1 hold frames can be adjusted so that the first initial voltage of the N-1th hold frame is positively biased relative to the first initial voltage of the refresh frame. Then, the first initial voltages of the first n hold frames among the N-1 hold frames can be adjusted so that the first initial voltages of the first n hold frames are positively biased relative to the first initial voltage of the N-1th hold frame. For another example, when switching from a first frequency to a second frequency, the second initial voltage of the N-1th hold frame among the N-1 hold frames can be adjusted so that the second initial voltage of the N-1th hold frame is positively biased relative to the second initial voltage of the refresh frame. Then, the second initial voltages of the first n hold frames among the N-1 hold frames can be adjusted so that the second initial voltages of the first n hold frames are negatively biased relative to the second initial voltage of the N-1th hold frame.

[0129] FIG. 9 is a schematic diagram showing adjustment of the first initial voltage and the second initial voltage by a display device according to an embodiment of the present disclosure.

[0130] As shown in FIG9 , when switching from a high frequency to a low frequency, again taking the switching from 120 Hz to 30 Hz as an example, in the following four consecutive frames, the first frame is a refresh frame, and the second to fourth frames are hold frames. The range of display brightness values ​​DBV1 to DBV3 can be the same as in the above embodiment and will not be repeated here.

[0131] Compensation for brightness variation can be achieved by adjusting the first initial voltage.

[0132] As shown in Figure 9, at the display brightness value DBV1, the first initial voltage of the first frame (refresh frame) is Vinit1_11. By adding a positive bias to Vinit1_11, the first initial voltage Vinit1_41 of the fourth frame (i.e., the last hold frame) can be obtained. For example, assuming Vinit1_11 is -3.2V, Vinit1_41 can be adjusted to -3.17V, that is, a positive bias of 0.03V relative to -3.2V. Then, based on the first initial voltage Vinit1_41 of the fourth frame (i.e., the last hold frame), adjustments are made to obtain the first initial voltages of the second frame (the first hold frame) and the third frame (the second hold frame). For example, the first initial voltage of the second frame (the first hold frame) can be equal to Vinit1_41 + ΔVinit1_21, and the first initial voltage of the third frame (the second hold frame) can be equal to Vinit1_41 + ΔVinit1_31. When Vinit1_41 is a negative voltage, ΔVinit1_21 and ΔVinit1_31 can both be negative, thereby achieving positive bias. The absolute values ​​of ΔVinit1_21 and ΔVinit1_31 can represent the amount of adjustment of the first initial voltage in the second and third frames. In some embodiments, the absolute values ​​of ΔVinit1_21 and ΔVinit1_31 can be in the range of 0.02V to 0.05V. In some embodiments, the absolute value of ΔVinit1_21 can be greater than the absolute value of ΔVinit1_31, that is, the amount of adjustment of the first initial voltage in the second frame is greater than the amount of adjustment of the first initial voltage in the third frame. For example, the absolute value of ΔVinit1_21 can be in the range of 0.04V to 0.05V, and the absolute value of ΔVinit1_31 can be in the range of 0.01V to 0.03V.

[0133] Similarly, at the display brightness value DBV2, the first initial voltage Vinit1_12 of the first frame can be forward biased to obtain the first initial voltage Vinit_42 of the fourth frame. The first initial voltage of the second frame is then obtained by adding ΔVinit1_22 to Vinit_42, and the first initial voltage of the third frame is obtained by adding ΔVinit1_32 to Vinit_42. The absolute values ​​of ΔVinit1_22 and ΔVinit1_32 can be within a range of 0.01V to 0.04V. The absolute value of ΔVinit1_22 can be greater than the absolute value of ΔVinit1_32. For example, the absolute value of ΔVinit1_22 is within a range of 0.02V to 0.04V, and the absolute value of ΔVinit1_32 is within a range of 0.01V to 0.02V.

[0134] Similarly, at the display brightness value DBV3, the first initial voltage Vinit_43 for the fourth frame can be obtained based on the first initial voltage Vinit1_13 for the first frame. Vinit_43 is then added to ΔVinit1_23 and ΔVinit1_33, respectively, to obtain the first initial voltages for the second and third frames. The absolute values ​​of ΔVinit1_23 and ΔVinit1_33 can be in a range of 0 V to 0.02 V. For example, the absolute value of ΔVinit1_23 can be in a range of 0.01 V to 0.02 V, such as 0.02 V; and the absolute value of ΔVinit1_33 can be in a range of 0 V to 0.01 V.

[0135] A vertical comparison reveals that for the same frame, the adjustment amount varies at different display brightness values. The larger the display brightness value, the larger the adjustment amount. Taking frame 2 (the first hold frame) as an example, DBV1 > DBV2 > DBV3, so the absolute value of ΔVinit1_21 > the absolute value of ΔVinit1_22 > the absolute value of ΔVinit1_23. Similarly, for frame 3 (the second hold frame), the absolute value of ΔVinit1_31 > the absolute value of ΔVinit1_32 > the absolute value of ΔVinit1_33.

[0136] In some embodiments, the second initial voltage may be adjusted to compensate for the brightness change. The second initial voltage may be adjusted in a manner similar to that of the first initial voltage.

[0137] As shown in Figure 9, at the display brightness value DBV1, the second initial voltage for the first frame (refresh frame) is Vinit2_11. By adding a negative offset to Vinit2_11, the second initial voltage for the fourth frame (i.e., the last hold frame) can be obtained, Vinit2_41. For example, assuming Vinit2_11 is 6.5V, Vinit2_41 can be adjusted to 6.53V, that is, a 0.03V positive offset relative to 6.5V. The second initial voltage for the second frame (the first hold frame) is then obtained by adding ΔVinit2_21 to Vinit2_41, and the second initial voltage for the third frame (the second hold frame) is obtained by adding ΔVinit2_31 to Vinit2_41. If Vinit2_41 is a positive voltage, both ΔVinit2_21 and ΔVinit2_31 can be negative, thereby achieving a negative offset. The absolute values ​​of ΔVinit2_21 and ΔVinit2_31 can represent the adjustment amount of the second initial voltage for the second and third frames. In some embodiments, the absolute values ​​of ΔVinit2_21 and ΔVinit2_31 can be in the range of 0.01V to 0.04V. In some embodiments, the absolute value of ΔVinit2_21 can be greater than the absolute value of ΔVinit2_31, that is, the adjustment amount of the second initial voltage in the second frame is greater than the adjustment amount of the second initial voltage in the third frame. For example, the absolute value of ΔVinit2_21 can be in the range of 0.03V to 0.04V, and the absolute value of ΔVinit2_31 can be in the range of 0.01V to 0.02V.

[0138] Similarly, at display brightness values ​​DBV2 and DBV3, a second initial voltage for each frame can be obtained. The absolute values ​​of ΔVinit2_22 and ΔVinit2_32 at display brightness value DBV2 can be in a range of 0.01 V to 0.03 V. The absolute value of ΔVinit2_22 can be greater than the absolute value of ΔVinit2_32. For example, the absolute value of ΔVinit2_22 is in a range of 0.02 V to 0.03 V, and the absolute value of ΔVinit2_32 is in a range of 0 V to 0.02 V, such as 0.01 V. The absolute values ​​of ΔVinit2_23 and ΔVinit2_33 at display brightness value DBV3 can be in a range of 0 V to 0.02 V. For example, the absolute value of ΔVinit2_23 can be in a range of 0.01 V to 0.02 V, such as 0.02 V; and the absolute value of ΔVinit2_33 can be in a range of 0 V to 0.01 V.

[0139] In some embodiments, under the same voltage difference, vinit3 is more sensitive, so vinit3 voltage can be adjusted first, and vinit2 can be used for fine-tuning. Specifically, vinit2 and vinit3 settings under different DBV are (taking 120 Hz to 30 Hz as an example).

[0140] Taking the sub-pixel circuit structure of Figure 2 as an example, the first initial voltage VINIT1 is the reset reference voltage for the first electrode (anode) of the light-emitting element EL, and the second initial voltage VINIT2 is the bias positive voltage. The lower the amplitude of the first initial voltage VINIT1 (the first initial voltage VINIT1 is a negative voltage, and the amplitude refers to the absolute value of the voltage), the higher the screen brightness; the higher the amplitude of the first initial voltage VINIT1, the lower the brightness. The higher the amplitude of the second initial voltage VINIT2 (positive voltage), the higher the brightness; the lower the amplitude of the second initial voltage VINIT2, the lower the brightness. By applying different first initial voltages VINIT1 and / or second initial voltages VINIT2 to different frames, the brightness of each frame can be more accurately fine-tuned to achieve a smooth transition during frequency switching. In some embodiments, fine-tuning of the voltages is sufficient. For example, the drive control circuit can support a voltage accuracy of 10mV for the first initial voltage VINIT1 and the second initial voltage VINIT2. This allows the compensation voltage in the first hold frame to be no more than 0.1V (100mV), and the compensation voltage in the second hold frame to be no more than 0.05V (50mV). Given the same voltage difference, the second initial voltage VINIT2 is more sensitive than the first initial voltage VINIT1. Therefore, coarse adjustment can be performed by first adjusting the second initial voltage VINIT2, and then fine-tuning can be performed by adjusting the first initial voltage VINIT1.

[0141] Taking the switch from 120Hz to 30Hz as an example, the voltage difference of the fourth frame relative to the first frame is due to the difference in steady state between the refresh frame and the hold frame. This is the steady-state difference of the variable refresh rate (VRR), which is caused by the different timing of the drive signals of the refresh frame and the hold frame as shown in Figures 4A and 4B. The embodiment of the present disclosure determines the adjustment amount for compensating for transient flicker by taking the fourth frame (the last hold frame) in a steady state as the most comparative basis, which can compensate for this difference and further improve the stability of the display brightness.

[0142] In some embodiments, the first and second initial voltages can be adjusted in combination. For example, a balanced adjustment can be made between the first and second initial voltages based on the brightness compensation effect to achieve the desired compensation effect. Compared to adjusting either the first or second initial voltage separately, this can alleviate the problem of excessive voltage variations that can cause significant changes at different nodes in the circuit, thereby achieving more balanced compensation.

[0143] In some embodiments, brightness variation compensation can also be achieved by adjusting the voltage difference between the power supply voltage ELVDD and the reference voltage ELVSS. For example, when switching from a first frequency to a second frequency, for the next N consecutive frames, at least one of the power supply voltage and the reference voltage for the first n hold frames can be adjusted so that the absolute difference between the power supply voltage and the reference voltage for the first n hold frames is less than the absolute difference between the power supply voltage and the reference voltage for the refresh frame. In some embodiments, the power supply voltage and the reference voltage for the first n hold frames can be adjusted equally so that the absolute difference between the power supply voltage and the reference voltage is twice the absolute difference between the power supply voltage and the reference voltage. Similarly, taking the example of switching from 120 Hz to 30 Hz, for the next four consecutive frames, with the first frame being the refresh frame and frames 2 through 4 being the hold frames, the absolute difference between the power supply voltage ELVDD and the reference voltage ELVSS for frames 2 and 3 can be adjusted relative to frame 1. The adjustment amount can be less than 0.15 V, for example, within 0.1 V. In some embodiments, the adjustment amount of ELVDD can be set to ΔV / 2, and the adjustment amount of ELVSS can be set to ΔV / 2, thereby achieving a total adjustment amount of ΔV and making the changes more balanced. As with other drive signal adjustment methods, different adjustment amounts can be used according to different display brightness values. The larger the DBV, the greater the adjustment amount. It is also possible to make the adjustment amount of the second frame larger than that of the third frame. This is not further explained here.

[0144] Under the same drive signal timing and voltage settings, as the voltage between the first and second electrodes of the light-emitting element EL (also known as the cross-voltage) increases, the brightness increases; as the cross-voltage decreases, the brightness decreases. The power supply voltage ELVDD is generally around 5V, for example, it can be 4.6V; the reference voltage ELVSS varies with the brightness level, with the higher the brightness, the greater the amplitude. When switching from high frequency to low frequency, the cross-voltage of the light-emitting element EL can be reduced by reducing the absolute value of the difference between the power supply voltage ELVDD and the reference voltage ELVSS, thereby compensating for the problem of instantaneous brightness increase caused by frequency switching. Conversely, when switching from low frequency to high frequency, the problem of instantaneous brightness decrease caused by frequency switching can be compensated by increasing the absolute value of the difference between the power supply voltage ELVDD and the reference voltage ELVSS.

[0145] According to an embodiment of the present disclosure, the power supply voltage ELVDD and the reference voltage ELVSS may be generated by a power supply circuit, and the driving circuit may adjust the power supply voltage ELVDD and the reference voltage ELVSS by controlling the power supply circuit.

[0146] Although the above embodiments are described by taking the switching from 120Hz to 30Hz as an example, the embodiments of the present disclosure are not limited to this. The embodiments of the present disclosure are applicable to the switching of various frequencies. For example, when the frequency is switched downward from 120Hz, there are multiple switching schemes such as 120 / 60Hz, 120 / 40Hz, 120 / 30Hz, 120 / 20Hz, 120 / 10Hz, 120 / 5Hz, and 120 / 1Hz. The ratio of refresh and hold frames in different schemes is different. For example, when the frequency is reduced from 120Hz to 10Hz, the hold frame is 11 frames, plus 1 refresh frame, for a total of 12 frames as 1 cycle. For different switching methods, generally, there is a brightness difference between the first frame of the hold frame (plus the refresh frame is actually the second frame) and the second frame of the hold frame (plus the refresh frame is actually the third frame). Therefore, for other switching frequencies, the first and second frames of the hold frame can be compensated, and the fourth frame and the part after the fourth frame can be the same as the setting of the fourth frame. In particular, when switching from 120 Hz to 60 Hz, since there is only one refresh frame and one hold frame, compensation is performed in the first hold frame without considering the second refresh frame.

[0147] The above embodiments illustrate various drive signal adjustment methods using the example of switching from a high frequency to a low frequency. Switching from a low frequency to a high frequency can also result in a momentary decrease in brightness for the same reason. To address this, a reverse adjustment method can be employed to compensate for this brightness reduction. Similarly, compensation for this brightness reduction can be achieved by adjusting at least one of the light-emission control signal, the first initial voltage, the second initial voltage, the power supply voltage, and the reference voltage.

[0148] For example, in response to an instruction to switch from the second frequency to the first frequency, the driving circuit adjusts the driving signal of the next refresh frame relative to the driving signal of the last held frame in the current group of N consecutive frames. For example, the driving signal of the next one or more refresh frames can be adjusted by at least one of the following: adjusting the effective level duration of the light-emitting control signal of the next refresh frame so that the effective level duration of the light-emitting control signal of the refresh frame is greater than the effective level duration of the light-emitting control signal of the held frame; adjusting the first initial voltage of the next refresh frame so that the first initial voltage of the next refresh frame is negatively biased relative to the first initial voltage of the held frame; adjusting the second initial voltage of the next refresh frame so that the second initial voltage of the next refresh frame is positively biased relative to the second initial voltage of the held frame; adjusting at least one of the power signal and the reference signal of the next refresh frame so that the absolute value of the difference between the power signal and the reference signal of the next refresh frame is greater than the absolute value of the difference between the power signal and the reference signal of the held frame. As when switching from high frequency to low frequency, the amount of adjustment can vary depending on the brightness, with the greater the brightness, the greater the adjustment amount. After switching to a low frequency, since all frames are refresh frames, the brightness reduction can be compensated by adjusting the drive signals of the first few (e.g., the first two) refresh frames. The adjustment amount for the first refresh frame can be greater than that for the second refresh frame. The specific adjustment method and adjustment amount can be referred to the case of switching from a high frequency to a low frequency, and will not be repeated here.

[0149] The display device of the embodiment of the present disclosure can be implemented in any electronic device with a display function. Examples of electronic devices include, but are not limited to, for example, but not limited to, smart phones, mobile phones, video phones, e-book readers, desktop computers (PCs), laptop PCs, netbook PCs, personal digital assistants (PDAs), portable multimedia players (PMPs), digital audio players, mobile medical devices, cameras, wearable devices (such as head-mounted devices, electronic clothing, electronic bracelets, electronic necklaces, electronic accessories, electronic tattoos, or smart watches), etc. The electronic device according to the embodiment of the present disclosure can also be an AR / VR display device, such as a helmet display, a stereo display mirror, and a glasses-type display. The electronic device according to the embodiment of the present disclosure can also be a near-eye device that replaces an optical structure with a digital display, such as professional equipment such as an electronic telescope, an electronic microscope, and a medical endoscope that have similar near-eye display requirements.

[0150] The electronic device according to the embodiments of the present disclosure may also be a smart home appliance including a display function. For example, the smart home appliance may be a television, a digital video disc (DVD) player, a stereo, a refrigerator, an air conditioner, a vacuum cleaner, an oven, a microwave oven, a washing machine, a dryer, an air purifier, a set-top box, a television (TV) box, a game console, an electronic dictionary, an electronic key, a video camera, an electronic photo frame, etc.

[0151] The electronic device according to the embodiments of the present disclosure may also be a medical device (for example, a magnetic resonance angiography (MRA) device, a magnetic resonance imaging (MRI) device, a tomography (CT) device, an imaging device, or an ultrasound device), a navigation device, a global positioning system (GPS) receiver, an event data recorder (EDR), a flight data recorder (FDR), an automotive infotainment device, a marine electronic device (for example, a marine navigation device, a gyroscope, or a compass), an avionics device, a security device, an industrial or consumer robot, an automatic teller machine (ATM), a point of sale (POS), etc.

[0152] The electronic device according to the embodiments of the present disclosure may also be furniture including a display function, a part of a building / structure, an electronic bulletin board, an electronic signature receiving device, a projector, a variety of measuring devices (e.g., a water meter, an electricity meter, a gas meter, or an electromagnetic wave measuring device), etc. The electronic device according to some embodiments may be any combination of the aforementioned devices. In addition, the electronic device according to various embodiments may be a flexible device. In addition, it should be clear to those skilled in the art that the electronic device according to various embodiments of the present disclosure is not limited to the aforementioned devices.

[0153] Embodiments of the present disclosure also provide a method for driving a display device. The method includes: generating a refresh frame drive signal at a first frequency, using each frame as a refresh frame, and applying the generated refresh frame drive signal and a data signal to a plurality of sub-pixels of the display device, so that the plurality of sub-pixels receive the data signal and emit light under the control of the refresh frame drive signal; generating a refresh frame drive signal and an N-1 hold frame drive signal for each group of N consecutive frames, including a refresh frame and N-1 hold frames, and applying the generated refresh frame drive signal and the hold frame drive signal to the plurality of sub-pixels, so that the plurality of sub-pixels receive the data signal and emit light under the control of the refresh frame drive signal, and hold the received data signal and emit light under the control of the hold frame drive signal, wherein N is the ratio of the first frequency to the second frequency, and N is an integer greater than 1. The method also includes: in response to receiving an instruction to switch from the first frequency to the second frequency, in the next group of N consecutive frames, adjusting the drive signals of the first n hold frames relative to the refresh frame drive signal, where 1≤n≤N-1.

[0154] 10 is a schematic flow chart of a method for driving a display device according to an embodiment of the present disclosure. This method is applicable to the display device of any of the above embodiments.

[0155] In step S110 , preparations are made before displaying the next frame.

[0156] In step S120 , it is determined whether frequency switching is to be performed. If so, step S130 is executed; otherwise, the process returns to step S110 .

[0157] In step S130 , it is determined whether the next frame is the first frame after the frequency switching. If yes, step S140 is executed; otherwise, the process returns to step S110 .

[0158] In step S140, the currently set display brightness value (DBV) is determined.

[0159] In step S150 , at least one of the pulse width and the amplitude of the light emitting control signal EM is adjusted according to the current DBV.

[0160] The pulse width (e.g., low-level duration) of the light control signal EM in one or more of the following multiple consecutive frames can be adjusted in the manner described in the above embodiment. Taking the frequency switching from 120 Hz to 30 Hz as an example, the composition of the next N consecutive frames is first determined based on the frequency switching ratio. For example, the first of the next four consecutive frames is determined to be a refresh frame, and the second to fourth frames are hold frames. The EM pulse width adjustment amount for each frame corresponding to the current DBV is then determined based on the mapping table. For example, the EM pulse width adjustment amount for the first frame is 0, the second frame is -12, the third frame is -4, and the fourth frame is 0. For the next four consecutive frames, the pulse width of the light control signal EM in the first frame (refresh frame) and the fourth frame (the last hold frame) can be maintained the same as that of the refresh frame at 120 Hz. The pulse width of the light control signal EM in the second frame (the first hold frame) is reduced by 12, and the pulse width of the light control signal EM in the third frame (the second hold frame) is reduced by 4. No adjustment is required for frames after the fourth frame. Conversely, when switching from a low frequency to a high frequency, for example, from 30Hz to 120Hz, the next N consecutive frames will all be refresh frames. The adjustment amount corresponding to the current DBV can be found for the first two refresh frames, and then the pulse width of the light control signal for the first two refresh frames can be adjusted accordingly. No adjustment is required for frames 3 and later.

[0161] Likewise, the amplitude (eg, low level value) of the light emitting control signal EM may also be adjusted in the manner of the above embodiment, which will not be described in detail here.

[0162] In step S160, at least one of the first initial voltage VINIT and the second initial voltage VINIT2 is adjusted according to the current DBV. The first initial voltage VINIT and / or the second initial voltage VINIT2 of one or more frames in the next plurality of consecutive frames can be adjusted in the manner described above, and will not be further described here.

[0163] In step S170, at least one of the power supply voltage ELVDD and the reference voltage ELVSS is adjusted according to the current DBV. The power supply voltage ELVDD and / or the reference voltage ELVSS of one or more frames in the next plurality of consecutive frames can be adjusted in the manner described above, which will not be repeated here.

[0164] At this point, the compensation of various driving signals is completed.

[0165] At step S180, display is performed using the compensated drive signals. For example, the drive control circuit may control the gate drive circuit to generate a gate drive signal and a compensated light-emitting control signal, control the power supply circuit to apply a compensated power supply voltage and a reference voltage to each sub-pixel, apply a compensated first initial voltage, a compensated second initial voltage, and a third initial voltage to each sub-pixel, and apply a data signal to each sub-pixel. Each sub-pixel performs display based on the data signal under the control of the various drive signals.

[0166] Although the above embodiments describe the steps of the method in a specific order, the embodiments of the present disclosure are not limited thereto. For example, the order of executing steps S140 to S170 can be set as needed, so that the adjustment of various drive signals can be performed in any desired order. For example, the steps S150, S160, S140, and S170 can be performed in the order of S150, S160, S140, and S170, or in any other suitable order.

[0167] Those skilled in the art will appreciate that the embodiments described above are exemplary and can be improved upon by those skilled in the art. The structures described in various embodiments can be freely combined without causing any conflicts in structure or principle.

[0168] After describing the preferred embodiments of the present disclosure in detail, those skilled in the art will clearly understand that various changes and modifications may be made without departing from the scope and spirit of the appended claims, and that the present disclosure is not limited to the exemplary embodiments described in the specification.

Claims

1. A display device, comprising: a plurality of sub-pixels arranged in an array form including rows and columns; a driving circuit connected to the plurality of sub-pixels, configured to generate driving signals for a refresh frame at a first frequency with each frame as a refresh frame, and apply the generated driving signals for the refresh frame and data signals to the plurality of sub-pixels of the display device, so that the plurality of sub-pixels receive the data signals and emit light under the control of the driving signals for the refresh frame; at a second frequency, taking N consecutive frames including a refresh frame and N - 1 holding frames as a group, generating driving signals for the refresh frame and driving signals for N - 1 holding frames for each group, and applying the generated driving signals for the refresh frame and driving signals for the holding frames to the plurality of sub-pixels, so that the plurality of sub-pixels receive the data signals and emit light under the control of the driving signals for the refresh frame, and maintain the received data signals and emit light under the control of the driving signals for the holding frames, where N is the ratio of the first frequency to the second frequency and N is an integer greater than 1; wherein, the driving circuit is further configured to, in response to receiving an instruction to switch from the first frequency to the second frequency, adjust the driving signals for the first n holding frames relative to the driving signal for the refresh frame in the next group of N consecutive frames, where 1 ≤ n ≤ N - 1.

2. The display device according to claim 1, wherein, the adjustment performed by the driving circuit includes: adjusting the driving signals for the first n holding frames according to the currently set display brightness value of the display device, where the larger the display brightness value, the greater the adjustment amount.

3. The display device according to claim 1 or 2, wherein, the adjustment performed by the driving circuit includes: adjusting the driving signals for the first n holding frames such that the adjustment amount of the driving signal for the n1-th holding frame is greater than the adjustment amount of the driving signal for the n2-th holding frame, where 1 ≤ n1 ≤ n2 ≤ n.

4. The display device according to any one of claims 1 to 3, wherein, the driving signal includes at least one of a light emission control signal, a first initial voltage, a second initial voltage, a power supply voltage, and a reference voltage, the light emission control signal is used to control the sub-pixels to emit light, the first initial voltage is used to initialize the voltage of the first pole of the light emitting element of the sub-pixel, the second initial voltage is used to initialize the input voltage of the driving transistor for driving the light emitting element of the sub-pixel, and the power supply voltage and the reference voltage are used to supply power to the sub-pixels.

5. The display device according to claim 4, wherein, the driving signal includes a light emission control signal, and the adjustment performed by the driving circuit includes: adjusting the waveform parameters of the light emission control signals for the first n holding frames relative to the waveform parameters of the light emission control signal for the refresh frame, so that the waveform parameters of the light emission control signals for the first n holding frames are adjusted to be less than the waveform parameters of the light emission control signal for the refresh frame, and the waveform parameters include at least one of an effective level duration and an amplitude.

6. The display device according to claim 5, wherein, When the display brightness value is between 200 nit and 900 nit, the adjustment amount of the effective level duration of the light emission control signal of the frame is 4 to 12 sub-pixels per line / pulse.

7. The display device according to claim 6, wherein when the display brightness value is between 200 nit and 900 nit, the adjustment amount of the effective level duration of the light emission control signal of the first holding frame is 8 to 12 sub-pixels per line / pulse, and the adjustment amount of the effective level duration of the light emission control signal of the second holding frame is 4 to 8 sub-pixels per line / pulse.

8. The display device according to claim 5, wherein when the display brightness value is between 10 nit and 200 nit, the adjustment amount of the effective level duration of the light emission control signal of the holding frame is 4 to 8 sub-pixels per line / pulse.

9. The display device according to claim 8, wherein when the display brightness value is between 10 nit and 200 nit, the adjustment amount of the effective level duration of the light emission control signal of the first holding frame is 4 to 8 sub-pixels per line / pulse, and the adjustment amount of the effective level duration of the light emission control signal of the second holding frame is 0 to 4 sub-pixels per line / pulse.

10. The display device according to claim 4, wherein the drive signal includes a first initial voltage (VINIT2), and the adjustment performed by the drive circuit includes: adjusting the first initial voltage of the (N - 1)-th holding frame among the N - 1 holding frames so that the first initial voltage of the (N - 1)-th holding frame is positively biased with respect to the first initial voltage of the refresh frame; adjusting the first initial voltages of the first n holding frames among the N - 1 holding frames so that the first initial voltages of the first n holding frames are positively biased with respect to the first initial voltage of the (N - 1)-th holding frame.

11. The display device according to claim 4, wherein the drive signal includes a second initial voltage (VINIT3), and the adjustment performed by the drive circuit includes: adjusting the second initial voltage of the (N - 1)-th holding frame among the N - 1 holding frames so that the second initial voltage of the (N - 1)-th holding frame is positively biased with respect to the second initial voltage of the refresh frame; adjusting the second initial voltages of the first n holding frames among the N - 1 holding frames so that the second initial voltages of the first n holding frames are negatively biased with respect to the second initial voltage of the (N - 1)-th holding frame.

12. The display device according to claim 4, wherein the drive signal includes at least one of the power supply voltage and the reference voltage, and the adjustment performed by the drive circuit includes: adjusting at least one of the power supply voltage and the reference voltage of the first n holding frames so that the absolute difference between the power supply voltage and the reference voltage of the first n holding frames is less than the absolute difference between the power supply voltage and the reference voltage of the refresh frame.

13. The display device according to claim 12, wherein The adjustment performed by the driving circuit further includes: equally adjusting the power supply voltage and the reference voltage of the first n holding frames, such that the adjustment amount of the absolute difference between the power supply voltage and the reference voltage is twice the adjustment amount of the power supply voltage and the reference voltage.

14. The display device according to any one of claims 1 to 13, wherein, when N = 2, n = 1; when N is greater than 2, n = 2.

15. The display device according to any one of claims 1 to 14, wherein, the driving circuit is further configured to, in response to receiving an instruction to switch from a second frequency to a first frequency, adjust the driving signal of the next one or more refresh frames relative to the driving signal of the last holding frame among the current group of N consecutive frames.

16. The display device according to claim 15, wherein, the driving signal includes at least one of a light emission control signal, a first initial voltage, a second initial voltage, a power supply voltage, and a reference voltage, and the driving circuit adjusts the driving signal of the next one or more refresh frames by at least one of the following: adjusting the effective level duration of the light emission control signal of the next one or more refresh frames, such that the effective level duration of the light emission control signal of the refresh frame is greater than the effective level duration of the light emission control signal of the holding frame; adjusting the first initial voltage of the next one or more refresh frames, such that the first initial voltage of the next one or more refresh frames is negatively biased relative to the first initial voltage of the holding frame; adjusting the second initial voltage of the next one or more refresh frames, such that the second initial voltage of the next one or more refresh frames is positively biased relative to the second initial voltage of the holding frame; adjusting at least one of the power supply signal and the reference signal of the next one or more refresh frames, such that the absolute value of the difference between the power supply signal and the reference signal of the next one or more refresh frames is greater than the absolute value of the difference between the power supply signal and the reference signal of the holding frame.

17. The display device according to any one of claims 1 to 16, wherein, the driving circuit includes: a gate driving circuit, connected to the plurality of sub - pixels, for generating a gate driving signal and a light emission control signal; a driving control circuit, connected to the gate driving circuit and the plurality of sub - pixels, for controlling the gate driving circuit to generate the gate driving signal and the light emission control signal, applying a data signal to the plurality of sub - pixels, and performing the adjustment on the light emission control signal.

18. The display device according to claim 17, wherein, the driving control circuit is further configured to provide the first initial voltage and / or the second initial voltage, and perform the adjustment on the first initial voltage and / or the second initial voltage.

19. The display device according to claim 17 or 18, wherein, the driving circuit further includes a power supply circuit for supplying the power supply voltage and the reference voltage to the sub - pixels, and the driving control circuit is further configured to control the power supply circuit to adjust at least one of the power supply voltage and the reference voltage.

20. The display device according to any one of claims 1 to 24, wherein, the sub - pixel includes a pixel driving circuit and a light - emitting element, and the pixel driving circuit includes: A driving sub - circuit, including a control terminal, an input terminal, and an output terminal; A storage sub - circuit, connected between the control terminal of the driving sub - circuit and a power signal terminal for receiving a power supply voltage; An input sub - circuit, connected to the input terminal of the driving sub - circuit, for providing a data signal to the input terminal of the driving sub - circuit under the control of a first gate driving signal; An input control sub - circuit, connected between the output terminal and the control terminal of the driving sub - circuit, for electrically connecting the output terminal of the driving sub - circuit and the control terminal under the control of a second gate driving signal; A light - emitting control sub - circuit, connected between the driving sub - circuit and the power signal terminal and between the driving sub - circuit and the light - emitting element, for conducting a path from the power signal terminal through the driving sub - circuit to the light - emitting element under the control of a light - emitting control signal; An initialization sub - circuit, connected to the input terminal of the driving sub - circuit, the output terminal of the driving sub - circuit, and the first pole of the light - emitting element, for initializing the voltages of the input terminal of the driving sub - circuit, the output terminal of the driving sub - circuit, and the first pole of the light - emitting element, wherein the second pole of the light - emitting element is connected to a reference signal terminal for receiving a reference voltage.

21. The display device according to claim 20, wherein, the driving sub - circuit includes a driving transistor, the gate of the driving transistor serves as the control terminal of the driving sub - circuit, the first pole of the driving transistor serves as the input terminal of the driving sub - circuit, and the second pole of the driving transistor serves as the output terminal of the driving sub - circuit.

22. The display device according to claim 20 or 21, wherein, the storage sub - circuit includes a capacitor, the first pole of the capacitor is connected to the control terminal of the driving sub - circuit, and the second pole of the second pole of the storage sub - circuit intercepts the power signal terminal.

23. The display device according to any one of claims 20 to 22, wherein, the input sub - circuit includes a first transistor (T4), the gate of the first transistor is configured to receive a first gate driving signal, the first pole of the first transistor is configured to receive a data signal, and the second pole of the first transistor is connected to the input terminal of the driving sub - circuit; the input control sub - circuit includes a second transistor, the gate of the second transistor is configured to receive a second gate driving signal, the first pole of the second transistor is connected to the output terminal of the driving sub - circuit, and the second pole of the second transistor is connected to the control terminal of the driving sub - circuit.

24. The display device according to any one of claims 20 to 23, wherein, the light - emitting control sub - circuit includes a third transistor (T5) and a fourth transistor (T6), the gate of the third transistor is configured to receive a light - emitting control signal, the first pole of the third transistor is connected to the power signal terminal, and the second pole of the third transistor is connected to the input terminal of the driving sub - circuit; the gate of the fourth transistor is configured to receive a light - emitting control signal, the first pole of the fourth transistor is connected to the output terminal of the driving sub - circuit, and the second pole of the fourth transistor is connected to the first pole of the light - emitting element.

25. The display device according to any one of claims 20 to 24, Among them, the initialization sub-circuit includes a fifth transistor, a sixth transistor, and a seventh transistor, where: the gate of the fifth transistor (T7) is configured to receive a first reset signal, the first pole of the fifth transistor is configured to receive a first initial voltage (VINIT2), and the second pole of the fifth transistor is connected to the first pole of the light-emitting element; the gate of the sixth transistor (T8) is configured to receive a first reset signal, the first pole of the sixth transistor is configured to receive a second initial voltage (VINIT3), and the second pole of the sixth transistor is connected to the input terminal of the driving sub-circuit; the gate of the seventh transistor (T1) is configured to receive a second reset signal, the first pole of the seventh transistor is configured to receive a third initial voltage (VINIT1), and the second pole of the seventh transistor is connected to the output terminal of the driving sub-circuit.

26. A driving method for a display device, including: at a first frequency, using each frame as a refresh frame to generate a driving signal for the refresh frame, and applying the generated driving signal for the refresh frame and the data signal to a plurality of sub-pixels of the display device, so that the plurality of sub-pixels receive the data signal and emit light under the control of the driving signal for the refresh frame; at a second frequency, taking N consecutive frames including a refresh frame and N - 1 holding frames as a group, generating a driving signal for the refresh frame and driving signals for N - 1 holding frames for each group, and applying the generated driving signal for the refresh frame and the driving signals for the holding frames to the plurality of sub-pixels, so that the plurality of sub-pixels receive the data signal and emit light under the control of the driving signal for the refresh frame, and maintain the received data signal and emit light under the control of the driving signal for the holding frame, where N is the ratio of the first frequency to the second frequency, and N is an integer greater than 1; wherein, the method further includes: in response to receiving an instruction to switch from the first frequency to the second frequency, in the next group of N consecutive frames, adjusting the driving signals for the first n holding frames relative to the driving signal for the refresh frame, where 1 ≤ n ≤ N - 1.

27. The method according to claim 26, wherein, adjusting the driving signals for the first n holding frames relative to the driving signal for the refresh frame includes: adjusting the driving signals for the first n holding frames according to the currently set display brightness value of the display device, where the larger the display brightness value, the greater the adjustment amount.

28. The method according to claim 26 or 27, wherein, adjusting the driving signals for the first n holding frames relative to the driving signal for the refresh frame includes: adjusting the driving signals for the first n holding frames such that the adjustment amount of the driving signal for the n1th holding frame is greater than the adjustment amount of the driving signal for the n2th holding frame, where 1 ≤ n1 ≤ n2 ≤ n.

29. The method according to any one of claims 26 to 28, wherein, The driving signal includes at least one of a light emission control signal, a first initial voltage, a second initial voltage, a power supply voltage, and a reference voltage. The light emission control signal is used to control the sub-pixel to emit light. The first initial voltage is used to initialize the voltage of the first pole of the light-emitting element of the sub-pixel. The second initial voltage is used to initialize the input terminal voltage of the driving transistor for driving the light-emitting element of the sub-pixel. The power supply voltage and the reference voltage are used to supply power to the sub-pixel.

30. The method according to any one of claims 26 to 29, wherein, when N = 2, n = 1; when N is greater than 2, n = 2.

31. The method according to any one of claims 26 to 30, further comprises: in response to receiving an instruction to switch from a second frequency to a first frequency, adjusting the driving signal of the next one or more refresh frames with respect to the driving signal of the last holding frame among the current group of N consecutive frames.

32. The display device according to claim 31, wherein, the driving signal includes at least one of a light emission control signal, a first initial voltage, a second initial voltage, a power supply voltage, and a reference voltage. Adjusting the driving signal of the next one or more refresh frames with respect to the driving signal of the last holding frame among the current group of N consecutive frames includes at least one of the following: adjusting the effective level duration of the light emission control signal of the next one or more refresh frames such that the effective level duration of the light emission control signal of the next one or more refresh frames is greater than the effective level duration of the light emission control signal of the last holding frame; adjusting the first initial voltage of the next one or more refresh frames such that the first initial voltage of the next one or more refresh frames is negatively biased with respect to the first initial voltage of the last holding frame; adjusting the second initial voltage of the next one or more refresh frames such that the second initial voltage of the next one or more refresh frames is positively biased with respect to the second initial voltage of the last holding frame; adjusting at least one of the power signal and the reference signal of the next one or more refresh frames such that the absolute value of the difference between the power signal and the reference signal of the next one or more refresh frames is greater than the absolute value of the difference between the power signal and the reference signal of the last holding frame.

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