Driving method of display panel, display panel and display device

Abstract

The present disclosure relates to a driving method of a display panel, a display panel and a display device. The driving timing of the display panel comprises a display period of each frame and a blank period before the display period, and the blank period is used for voltage and timing preparation before the display period; the driving method comprises: judging whether a reference voltage for display needs to be switched; if the reference voltage needs to be switched, controlling the reference voltage to change from a current reference voltage to a target reference voltage step by step in the blank period. Through the technical scheme of the present disclosure, by setting the reference voltage to change step by step in the blank period, the coupling effect on the capacitor can be weakened, so as to improve the capacitor howling problem while ensuring normal display, and improve the use experience.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular, to a driving method of display panel, display panel and display device. BACKGROUND

[0002] With the continuous development of display technology, in order to reduce energy consumption, when displaying static pictures, a low-frequency driving mode (i.e. skip mode) can be used to drive the display panel; while displaying dynamic pictures, a high-frequency driving mode is used to drive the display panel. However, when low-frequency driving, the capacitive howling phenomenon caused by voltage switching is obvious, which affects the user experience. SUMMARY

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a driving method of display panel, display panel and display device.

[0004] In a first aspect, the present disclosure provides a driving method of display panel, the driving timing of the display panel includes a display period of each frame and a blank period before the display period, the blank period is used for voltage and timing preparation before entering the display period; the driving method comprises:

[0005] determining whether the reference voltage for display needs to be switched;

[0006] if the reference voltage needs to be switched, controlling the reference voltage to change from the current reference voltage to the target reference voltage in the blank period.

[0007] In a second aspect, the present disclosure also provides a display panel, which is driven by the above driving method in low-frequency mode.

[0008] In a third aspect, the present disclosure also provides a display device, which comprises the above display panel.

[0009] The technical solutions provided by the present disclosure have the following advantages compared with the prior art:

[0010] In the driving method of the display panel provided by the present disclosure, it is determined whether the reference voltage for display needs to be switched; and when the reference voltage needs to be switched, the reference voltage is controlled to change from the current reference voltage to the target reference voltage in the blank period. In this way, the coupling energy of the small voltage change caused by the step change is small, so as to reduce the energy accumulation, and then improve the capacitive howling phenomenon caused by the energy accumulation, which is beneficial to improve the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0011] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate implementations of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure.

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the accompanying drawings required by the embodiments or prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.

[0013] Figure 1 A structural schematic diagram of a display panel provided by the embodiments of the present disclosure is shown.

[0014] Figure 2 A signal waveform schematic diagram of a capacitive howling provided by the related art is shown.

[0015] Figure 3 A driving timing schematic diagram of a display panel provided by the related art is shown.

[0016] Figure 4 A flowchart of a driving method provided by the embodiments of the present disclosure is shown.

[0017] Figure 5 A reference signal adjustment mode schematic diagram in the driving method provided by the embodiments of the present disclosure is shown.

[0018] Figure 6 Another reference signal adjustment mode schematic diagram in the driving method provided by the embodiments of the present disclosure is shown.

[0019] Figure 7 Another driving timing schematic diagram provided by the embodiments of the present disclosure is shown.

[0020] Figure 8 Still another driving timing schematic diagram provided by the embodiments of the present disclosure is shown.

[0021] Figure 9 An improved signal waveform schematic diagram provided by the embodiments of the present disclosure is shown.

[0022] Figure 10 A reference voltage and charge pump output voltage comparison schematic diagram provided by the embodiments of the present disclosure is shown.

[0023] Figure 11 A structural schematic diagram of a display device provided by the embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0024] In order to enable a more clear understanding of the above-mentioned purposes, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0025] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present disclosure, but the present disclosure can also be implemented in other manners different from those described herein; obviously, the embodiments described in the specification are only a part of the embodiments of the present disclosure, and not all the embodiments.

[0026] Figure 1 A structure of a display panel is shown. Referring to Figure 1 , the display panel includes a display area AA and a non-display area DA surrounding the display area AA, a plurality of sub-pixels are arranged in the display area AA, each sub-pixel includes a pixel driving circuit 12 and a light emitting element 13, a negative electrode of the light emitting element 13 is connected to a low power supply end (shown as PVEE in the middle), a positive electrode of the light emitting element 13 is connected to the pixel driving circuit 12, the pixel driving circuit 12 is used to drive the light emitting element 13 to emit light to display image information; the non-display area DA is used to arrange a flexible printed circuit board (FPCB) 15 connected to a display driving IC 11, the display driving IC can include an integrated source driving chip and a gate driving chip; in other embodiments, the source driving chip and the gate driving chip can also be independently arranged, which is not limited here. Figure 1

[0027] Exemplarily, the pixel driving circuit 12 can be a 7T1C circuit or other types of pixel driving circuits, which are not limited here. The display driving IC 11 can be connected to the pixel driving circuit 12 through a plurality of different types of traces to transmit display signals such as scanning signals, light emitting control signals, initialization signals, reference voltage signals, etc. to the pixel driving circuit 12, so that the pixel driving circuit 12 can drive the corresponding connected light emitting element 13 to emit light.

[0028] Exemplarily, the display driving IC 11 can also be connected to the edge of the display panel by any bonding technology known to those skilled in the art, which is not described or limited here.

[0029] ​Exemplarily, the light emitting element 13 can be an Organic Light Emitting Diode (OLED). For the OLED, in order to reduce energy consumption, a low-frequency driving mode can be set. Specifically, at a normal refresh frequency, i.e., corresponding to displaying dynamic pictures, a high-frequency driving mode can be adopted, and a direct current signal can be used for the reference voltage of the anode of the OLED; at a lower refresh frequency, i.e., corresponding to displaying static pictures, a low-frequency driving mode can be adopted, and an alternating current signal can be used for the reference voltage of the anode of the OLED, so as to avoid the problem of brightness difference caused by voltage decay, ensure that the brightness difference between adjacent frames is small, and thus improve the screen flicker level of the display panel and the display device including the display panel.

[0030] Exemplarily, the above-mentioned reference voltage for the anode can be output by the display driving IC 11 and transmitted to the anode of the light emitting element 13 through the flexible printed circuit board 15 by the reset light emitting tube in the pixel driving circuit 12, so as to realize the reset of the anode.

[0031] The flexible printed circuit board 15 includes a capacitor pump, which can also be called a charge pump or an AVEE capacitor. AVEE can be understood as the output end of the capacitor pump, and the corresponding output voltage can be represented as V AVEE Since the capacitor type charge pump does not include an inductor, electromagnetic interference caused by the inductor can be avoided. The charge pump is widely used in the power management system design of display screens or handheld devices, and is also called a switched capacitor voltage converter. It is a direct current converter that stores energy by using a capacitor instead of an inductor or a transformer.

[0032] Specifically, the input voltage can be increased or decreased by the charge pump, and even a negative voltage can be generated; by arranging the charge pump in the form of a switch array and controlling the charging and discharging of the switch capacitor in a certain way, the input voltage can be multiplied or divided by a certain factor, so as to obtain the required output voltage.

[0033] The capacitor howling in the background art is a resonance caused by the AVEE capacitor in the flexible printed circuit board 15 due to the energy accumulation caused by the large change of the reference voltage. That is, the reference voltage with large change continuously couples to the output end of the capacitor, so that the output voltage continuously increases, and the resonance howling of the corresponding capacitor pump is obvious.

[0034] Exemplarily, during the driving process of the display panel, the output voltage V AVEE, the voltage variation waveform is obtained. At the base frequency (for example, 120 Hz refresh frequency), the output voltage of the capacitor pump fluctuates less, and the sound generated by the AVEE capacitor is within an acceptable range; while at the refresh frequency of 60 Hz, the output voltage of the capacitor pump appears a higher peak, and the sound measured on the AVEE capacitor is out of range. Specifically, Figure 2 The output voltage V AVEE The trend over time. Referring to Figure 2 When the reference voltage adopts an alternating signal, the alternating reference voltage continuously couples to the output voltage of the capacitor pump when the voltage switching is performed, causing the output voltage of the capacitor pump to appear a periodic peak (shown as 01), and the size is about 500 mV, and the AVEE capacitor resonant howling. When the reference voltage switches between the alternating signal and the direct current signal, the AVEE capacitor resonant howling also exists.

[0035] To this end, the display panel driving method provided by the embodiments of the present disclosure mainly aims at the low frequency mode and the switching between the high and low frequency modes, and by setting the voltage step-up or step-down change of the reference voltage to change in steps, a larger voltage change can be divided into multiple small voltage changes. Compared with the coupling energy of a complete large voltage change to the output voltage of the capacitor pump, the overall coupling energy of the multiple small voltage changes to the output voltage of the capacitor pump is smaller, thereby reducing the energy accumulation and improving the resonant howling caused by the energy accumulation of the AVEE capacitor due to the large pulse change of the reference voltage.

[0036] The display panel driving method, the display panel and the display device provided by the embodiments of the present disclosure will be described below in conjunction with the accompanying drawings.

[0037] Exemplarily, Figure 3 The division mode of a single frame period in the driving timing of the display panel is shown. Wherein, V1 represents a data signal, V2 represents a field synchronization signal, or a vertical synchronization signal, and V3 represents a video frame; T1 represents a synchronization pulse, T2 represents a display front edge, T3 represents a display period, T4 represents a display rear edge, and T5 represents a frame, which is equal in time to the sum of the time of the synchronization pulse, the display front edge, the display period and the display rear edge.

[0038] Wherein, the display front edge can also be referred to as a front edge interval, and the display rear edge can also be referred to as a rear edge interval, and both of them can be referred to as a porch area or a blank area. The porch area corresponds to a non-display period (i.e. a blank period) of the display panel, and is mainly used for voltage and timing preparation before entering the display period.

[0039] In the embodiments of the present disclosure, based on the fact that each frame in the driving timing of the display panel includes a display period and a blank period before the display period, when it is determined that the display reference voltage is to be switched, the current reference voltage is controlled to change to the target reference voltage in the blank period before the display period in steps, so that the energy accumulation caused by the coupling of the AVEE capacitor is reduced by using the smaller voltage change corresponding to each step, thereby reducing the capacitor resonance howling.

[0040] Exemplarily, Figure 4 A flow of a driving method provided by the embodiments of the present disclosure is shown. Referring to Figure 4 The driving method can include the following steps:

[0041] S21, determining whether the display reference voltage is to be switched.

[0042] The display reference voltage is the reference voltage for the anode of the light emitting element in the foregoing, which reaches the anode of the light emitting element via the reset light emitting tube of the pixel driving circuit after passing through the flexible printed circuit board. When the display reference voltage remains unchanged, no energy coupling on the capacitor will occur, and no capacitor howling will exist. When the display reference voltage changes, the output voltage of the AVEE capacitor on the flexible printed circuit board will be coupled, which can cause capacitor howling. Therefore, the display reference voltage is determined in this step. If there is no signal switching, there is no change in the reference voltage, and the reference voltage can be output as a constant value. If there is signal conversion, the reference voltage changes, and the process of voltage change needs to be controlled, as in S120 below, to improve the capacitor resonance howling.

[0043] S22, if the reference voltage is to be switched, controlling the reference voltage to change to the target reference voltage in steps in the blank period from the current reference voltage.

[0044] If the reference voltage is to be switched, it means that the reference voltage will change, i.e., from outputting a constant value to outputting a changing value. At this time, to improve the capacitor resonance howling caused by energy accumulation, the reference voltage is controlled to be adjusted in steps in the blank period, i.e., the reference voltage changes to the target reference voltage in steps in the blank period. Thus, the single-step change between the current reference voltage and the target reference voltage is adjusted to multi-step change, which reduces the amplitude of the single voltage change, thereby reducing the overall coupling effect of the voltage change on the output voltage of the AVEE capacitor, weakening the energy accumulation, and further improving the problem of capacitor resonance howling caused by coupled energy accumulation.

[0045] Exemplarily, based on the relative size relationship between the current reference voltage and the target reference voltage, the adjustment change process of the reference voltage can include stepwise voltage rise or stepwise voltage drop, which will be described in detail below.

[0046] The driving method of the display panel provided by the embodiments of the present disclosure includes a display period of each frame and a blank period before the display period, and the blank period is used for voltage and timing preparation before the display period; whether the reference voltage for display needs to be switched is determined; and when the reference voltage needs to be switched, the reference voltage is controlled to change from the current reference voltage to the target reference voltage in the blank period in steps. The single-step change between the current reference voltage and the target reference voltage can be adjusted to multi-step change, the amplitude of the single change of the voltage is reduced, thereby reducing the overall coupling effect of the voltage change on the output voltage of the AVEE capacitor, weakening the energy accumulation, and further improving the problem of capacitor resonance howling caused by the coupling energy accumulation.

[0047] In some embodiments, Figure 5 and Figure 6 respectively show the change trend of the reference voltage corresponding to the step-down and step-up over time. In Figure 4 , referring to Figure 5 and Figure 6 , the "controlling the reference voltage to change from the current reference voltage to the target reference voltage in the blank period in steps" in S22 can specifically include:

[0048] When the target reference voltage is greater than the current reference voltage, the reference voltage is controlled to step up from the current reference voltage to the target reference voltage in the blank period, as shown in Figure 6 ; or when the target reference voltage is less than the current reference voltage, the reference voltage is controlled to step down from the current reference voltage to the target reference voltage in the blank period, as shown in Figure 5 .

[0049] Wherein, Figure 5 and Figure 6 , Vref represents the reference voltage, and the dashed line represents the change mode of the reference voltage in the related art, i.e. single-step change; the solid line represents the change mode of the reference voltage in the embodiments of the present disclosure, i.e. step change. Specifically, Figure 5 , the target reference voltage is less than the current reference voltage, i.e. the reference voltage decreases, and the reference voltage is controlled to step down in the blank period in the embodiments of the present disclosure; similarly, Figure 6 , the target reference voltage is greater than the current reference voltage, i.e. the reference voltage increases, and the reference voltage is controlled to step up in the blank period in the embodiments of the present disclosure.

[0050] In some embodiments, the switching of the reference voltage can include switching corresponding to the AC signal in the low-frequency driving mode, and can also include switching between the AC signal and the DC signal corresponding to the reference voltage; the latter is associated with the refresh frequency of the display picture. As mentioned above, in the high-frequency driving mode, the reference voltage adopts the DC signal, and in the low-frequency driving mode, the reference voltage adopts the AC signal, so as to ensure good display picture quality while reducing energy consumption.

[0051] Specifically, the driving method can further include the following steps:

[0052] When the refresh frequency of the display picture is greater than the target refresh frequency, the reference voltage is controlled to be a DC signal;

[0053] When the refresh frequency of the display picture is equal to or less than the target refresh frequency, the reference voltage is controlled to be an AC signal.

[0054] The target refresh frequency is a frequency for distinguishing between the high-frequency driving mode and the low-frequency driving mode. When the refresh frequency is greater than the target refresh frequency, the display panel adopts the high-frequency driving mode, and the corresponding reference voltage adopts the DC signal; when the refresh frequency is less than or equal to the target refresh frequency, the display panel adopts the low-frequency driving mode, and the corresponding reference voltage adopts the AC signal. Exemplarily, the target refresh frequency can be 60 Hz, 80 Hz, or other frequency values, which are not limited herein.

[0055] When the high-low frequency driving switching is performed, and in the low-frequency driving mode, the reference voltage is not a constant value, but a variable amount, and the reference voltage is adjusted in steps for the change, so as to weaken the capacitive coupling and improve the capacitive resonance howling.

[0056] The reference voltage corresponding to the switching between the DC signal and the AC signal is changed, and the amplitude remains unchanged.

[0057] The amplitude of the reference voltage remains unchanged in the high-frequency driving mode and the low-frequency driving mode, and the same reference voltage can be adopted, but only the AC-DC conversion is performed in different driving modes. Specifically, the AC signal is adopted in the low-frequency driving mode, and the reference voltage is adjusted in a stepwise and adjustable gradient manner when switching.

[0058] Therefore, compared with the technical solution of adopting two reference signals to respectively transmit the reference voltage of the DC signal and the reference voltage of the AC signal, the same reference signal can be adopted to transmit the DC signal and the AC signal in time division manner in the embodiment of the present disclosure, which is beneficial to simplify the hardware circuit structure, reduce the hardware circuit cost, and realize high resolution.

[0059] In some embodiments, continuing to refer to Figure 1The display panel includes a display driving circuit (shown as display driving IC 11), a reference signal line (shown as 14), and display pixels; each display pixel includes an anode of a light emitting element 13 and a pixel driving circuit 12, and all the anodes are connected to the display driving circuit through the reference signal line 14; specifically, the anode of the light emitting element 13 can be connected to the reference signal line 14 via the pixel driving circuit 12 and connected to the display driving IC 11.

[0060] Based on this, the driving method can further include:

[0061] In each frame, the same reference voltage is transmitted to all the anodes based on the display driving circuit and the reference signal line.

[0062] In this way, the anodes of all the light emitting elements are reset to avoid the influence of the previous frame on the current frame display picture. At the same time, as shown in Figure 1 , the reference voltage of the alternating current signal and the reference voltage of the direct current signal are transmitted to the display area AA through the same reference signal line 14, and the hardware circuit structure is simple.

[0063] Exemplarily, the reference signal line 14 can be a patterned transparent electrode layer, for example, indium tin oxide (ITO), or other material layers known to those skilled in the art, which is not limited here.

[0064] It can be understood that, in the high-frequency driving mode and the low-frequency driving mode, the reference voltage is transmitted to all the anodes based on the display driving circuit and the same reference signal line, and the difference is only the difference between the direct current signal and the alternating current signal, rather than signal switching based on the hardware circuit.

[0065] In some embodiments, the switching of the alternating current signal and the direct current signal of the reference voltage can include switching the alternating current signal to the direct current signal, and can also include switching the direct current signal to the alternating current signal. Specifically, on the basis of Figure 4 , S21 can specifically include the following steps:

[0066] determining whether the display reference voltage is to be switched from the direct current signal to the alternating current signal;

[0067] Or, determining whether the display reference voltage is to be switched from the alternating current signal to the direct current signal.

[0068] In this way, whether the reference voltage is switched from the direct current signal to the alternating current signal, or switched from the alternating current signal to the direct current signal, that is, whether it is switched from the high-frequency driving mode to the low-frequency driving mode, or switched from the low-frequency driving mode to the high-frequency driving mode, all correspond to the switching of the voltage, and for the voltage switching, a stepwise change adjustment mode can be adopted, so as to reduce the capacitive coupling energy and improve the capacitive resonance howling.

[0069] In some embodiments, in combination with the above,Figure 4 The "controlling the reference voltage to change from the current reference voltage to the target reference voltage step by step in the blank period" in S22 can specifically include:

[0070] When switching from the direct-current signal to the alternating-current signal, the target reference voltage is less than the current reference voltage, and the reference voltage is controlled to change from the current reference voltage to the target reference voltage step by step in the blank period, as shown in FIG. 2B; or Figure 7

[0071] When switching from the alternating-current signal to the direct-current signal, the target reference voltage is greater than the current reference voltage, and the reference voltage is controlled to change from the current reference voltage to the target reference voltage step by step in the blank period, as shown in FIG. 2C. Figure 8

[0072] Specifically, Figure 7 FIG. 2A shows a change trend of the reference voltage over time when the reference voltage is switched from the direct-current signal to the alternating-current signal, Figure 8 FIG. 2B shows a change trend of the reference voltage over time when the reference voltage is switched from the alternating-current signal to the direct-current signal. Figure 7 and Figure 8 In S21, V11 represents a field synchronization signal (Vsync), V12 represents a horizontal synchronization signal (Hsync), V13 represents a feedback signal (TE), and V14 represents a reference voltage (Vref). In combination with Figure 7 and Figure 8 The switching between the direct-current signal and the alternating-current signal can correspond to the switching between a refresh frame and a holding frame. When the reference signal is switched from the direct-current signal to the alternating-current signal, the voltage adjustment function can be turned on, so that the switching of the reference voltage is step by step. When the reference voltage is switched from the alternating-current signal to the direct-current signal, the voltage adjustment function can be turned off, and at this time, the reference voltage remains a constant value corresponding to the direct-current signal.

[0073] In some embodiments, in combination with the above, the switching of the reference voltage can also include voltage switching when the reference voltage adopts the alternating-current signal. Specifically, the driving method can further include:

[0074] If the reference voltage is the alternating-current signal, the reference voltage is controlled to change from the current reference voltage to the target reference voltage step by step in the blank period.

[0075] Specifically, when the reference voltage adopts the alternating-current signal, the reference voltage is switched between a first reference voltage and a second reference voltage corresponding to two adjacent holding frames. Based on this, in the last holding frame, the current reference voltage can be the first reference voltage, and the target reference voltage can be the second reference voltage; in the current holding frame, the current reference voltage can be the second reference voltage, and the target reference voltage can be the first reference voltage; in the next holding frame, the current reference voltage can be the first reference voltage, and the target reference voltage can be the second reference voltage, and so on. ​​

[0076] For example, in combination with Figure 7 or Figure 8 , the first reference voltage can be -2.7V, and the second reference voltage can be -3.5V. In other embodiments, the first reference voltage and the second reference voltage can also be other voltage values, which are not limited herein.

[0077] For example, Figure 9 The driving method provided by the embodiments of the present disclosure is compared with the driving method in the related art to cause the AVEE capacitor output voltage, Figure 10 The AVEE capacitor output voltage and the reference voltage in the driving method provided by the embodiments of the present disclosure are compared over time. Wherein, V AVEE-V represents the output voltage of the AVEE capacitor measured by the driving method provided by the embodiments of the present disclosure, V AVEE represents the output voltage of the AVEE capacitor measured by the driving method in the related art, and Vref represents the reference voltage.

[0078] It can be known from Figure 9 and Figure 10 that in the driving method provided by the embodiments of the present disclosure, by setting the reference voltage to change from the current reference voltage to the target reference voltage in steps, the coupling to the AVEE capacitor can be reduced, so that the output voltage peak value of the AVEE is relatively reduced. For example, when the step number of the step change is 32, the output voltage peak value is reduced from 560mV (for example, the spike 01 in Figure 9 to 280mV (for example, the spike 31 in Figure 9 ), the howling decibel is reduced from 9dB to 6dB, the corresponding subjective perceptible capacitor howling is obviously reduced or disappeared, and the improvement effect is good.

[0079] In the above embodiments, the step number N of the step change satisfies: 4≤N≤16384, and N is an integer.

[0080] For example, Figure 7 and Figure 8 , the step number N is 8, and the voltage change amount corresponding to a single step is 0.1V. In other embodiments, the value of the step number N can also be 4, 16, 32, 1024, 16384 or other optional arbitrary values, which can be set based on the requirements of the driving method.

[0081] In other embodiments, the specific value of the step number can also be adaptively adjusted and set according to the improvement effect of the requirements.

[0082] The driving method of the display panel provided by the embodiments of the present disclosure includes: in a blank period before a display period, setting the reference voltage to change from a current reference voltage to a target reference voltage step by step, so as to realize voltage gradual change of multiple steps, and compared with single-step change, the energy accumulation of the AVEE capacitor caused by the change of the reference voltage is reduced, thereby improving the capacitor resonance howl caused by the energy accumulation.

[0083] The embodiments of the present disclosure also provide a display panel, which is driven by any one of the driving methods provided in the above embodiments, and has the corresponding beneficial effects.

[0084] In other embodiments, the display panel can also include other structural components known to those skilled in the art, which are not limited herein.

[0085] The embodiments of the present disclosure also provide a display device, which includes any one of the display panels provided in the above embodiments, and has the corresponding beneficial effects.

[0086] Exemplarily, Figure 11 A display device provided by the embodiments of the present disclosure is shown. Referring to Figure 11 The display device 30 can be a tablet computer, a mobile phone or other terminal device with a display function, which is not limited herein.

[0087] In other embodiments, the display device can also include touch components, fingerprint recognition components, face recognition components and other structural components known to those skilled in the art, which are not limited herein.

[0088] It should be noted that, in this document, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. And, the term "comprises", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a list of elements does not exclude other elements not explicitly listed, or other elements inherent to such process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus including the element.

[0089] The foregoing is merely illustrative of the various implementations of the present disclosure and the general principles thereof. Numerous modifications can be made to these illustrations, and equivalents can be substituted therefor, without departing from the scope of the present disclosure. The specific embodiments commensurate with the specific application are intended to be illustrative only and not limiting of the scope of the application as set forth in the following claims.

Claims

1. A driving method of a display panel, characterized by, The driving timing of the display panel comprises a display period of each frame and a blank period before the display period, and the blank period is used for voltage and timing preparation before the display period; The driving method comprises: judging whether the reference voltage for display is to be switched, comprising: judging whether the reference voltage for display is to be switched from a direct current signal to an alternating current signal, or judging whether the reference voltage is to be switched from the alternating current signal to the direct current signal; if the reference voltage is to be switched, controlling the reference voltage to change from a current reference voltage to a target reference voltage in the blank period; wherein, when the refresh frequency of the display picture is greater than a target refresh frequency, the reference voltage is controlled as the direct current signal; when the refresh frequency of the display picture is equal to or less than the target refresh frequency, the reference voltage is controlled as the alternating current signal; when the refresh frequency is switched, the reference voltage corresponds to the switching of the direct current signal and the alternating current signal, and the amplitude remains unchanged.

2. The driving method according to claim 1, wherein The display panel comprises a display driving circuit, a reference signal line and display pixels; each display pixel comprises an anode of a light emitting element, and all the anodes are connected to the display driving circuit through the reference signal line; The method further comprises: in each frame, based on the display driving circuit and the reference signal line, transmitting the same reference voltage to all the anodes.

3. The driving method according to claim 1, wherein Further comprising: if the reference voltage is an alternating current signal, controlling the reference voltage to change from a current reference voltage to a target reference voltage in the blank period.

4. The driving method according to any one of claims 1 to 3, characterized by, The number of steps N of the step change satisfies: 4≤N≤16384, and N is an integer.

5. The driving method according to claim 1 or 2, wherein The controlling of the reference voltage to change from a current reference voltage to a target reference voltage in the blank period comprises: when the alternating current signal is switched to the direct current signal, the target reference voltage is greater than the current reference voltage, and the reference voltage is controlled to step up from the current reference voltage to the target reference voltage in the blank period; or, when the direct current signal is switched to the alternating current signal, the target reference voltage is less than the current reference voltage, and the reference voltage is controlled to step down from the current reference voltage to the target reference voltage in the blank period.

6. The driving method according to any one of claims 1 to 3, wherein The controlling of the reference voltage to change from a current reference voltage to a target reference voltage in the blank period comprises: when the target reference voltage is greater than the current reference voltage, the reference voltage is controlled to step up from the current reference voltage to the target reference voltage in the blank period; or, when the target reference voltage is less than the current reference voltage, the reference voltage is controlled to step down from the current reference voltage to the target reference voltage in the blank period.

7. A display panel, characterized by, The driving method of any one of claims 1-6 is used for low frequency driving.

8. A display device, characterized by comprising: The display panel of claim 7 is included.

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