Display driving method, display driving device and display device

Abstract

The invention provides a display driving method, a display driving device and a display device.The display driving method comprises the steps that in response to an effective display signal, a data line outputs a first polarity voltage; the data line outputs a second polarity voltage in response to a vertical blanking signal and in response to the fact that the duration of a vertical blanking period reaches a preset time; the polarity of the first polarity voltage is opposite to that of the second polarity voltage. According to the display driving method, by delaying the polarity switching time, electric leakage can be accelerated under the high refresh rate, the brightness of the high refresh rate is reduced, the brightness difference between the high refresh rate and the brightness of the low refresh rate is reduced, and the screen flicker phenomenon during refresh rate switching is improved.

Description

TECHNICAL FIELD

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

[0002] The existing display panel is driven in a variable refresh rate (VRR) mode. In the VRR mode, the transformation of the refresh frequency is realized by adjusting the length of the vertical blank interval (V blank). In the VRR mode, the lower the refresh frequency, the longer the length of the vertical blank interval, and the higher the refresh frequency, the shorter the length of the vertical blank interval.

[0003] Taking a liquid crystal display (LCD) panel as an example, the charging time of each row of pixel capacitance under a low refresh rate is the same as that under a high refresh rate, that is, when a thin film transistor (TFT) is just turned off under different refresh rates, the pixel voltage at both ends of the liquid crystal is consistent, so the brightness is consistent. However, after the TFT is turned off, the duration of the vertical blanking zone is longer in the case of a low refresh rate, so the holding time of the pixel capacitance voltage is longer than that in the case of a high refresh rate, and the longer the holding time, the more the pixel capacitance leaks, thereby making the voltage at both ends of the liquid crystal capacitor smaller, and the brightness lower than that in the case of a high refresh rate. Therefore, when the high and low refresh frequencies are quickly switched, the pixel display brightness changes greatly, and the user can feel obvious flicker with naked eyes. SUMMARY

[0004] The present application mainly provides a display driving method, a display driving device and a display device, and the display driving method of the present application can improve the screen flicker phenomenon.

[0005] To solve the above technical problems, the first technical solution adopted by the present application is to provide a display driving method, comprising: in response to an effective display signal, a data line outputs a first polarity voltage; in response to a vertical blanking signal, and in response to the duration of the vertical blanking period reaching a preset time, the data line outputs a second polarity voltage; the first polarity voltage and the second polarity voltage are opposite in polarity.

[0006] In an embodiment, in response to the vertical blanking signal, and the duration of the vertical blanking period does not reach the preset time, the data line outputs the first polarity voltage.

[0007] In an embodiment, the preset time corresponding to each display frame at different refresh rates is the same, and the preset time is determined by the total time of the vertical blanking period of the highest refresh rate.

[0008] In an embodiment, the preset time is determined by the refresh rate of the current display frame; wherein the preset time is positively correlated with the refresh rate of the current display frame.

[0009] In an embodiment, the preset time is in the range of [0, Z], and Z represents the total time of the vertical blanking period of the highest refresh rate.

[0010] In an embodiment, in response to the valid display signal, the data line outputs a first polarity voltage, comprising: In response to the valid display signal, the source driver outputs a first current signal to the data line, so that the data line outputs the first polarity voltage based on the first current signal; In response to the vertical blanking signal, and the duration of the vertical blanking period does not reach the preset time, the data line outputs the first polarity voltage, comprising: In response to the vertical blanking signal, and the duration of the vertical blanking period does not reach the preset time, the source driver outputs a second current signal to the data line, so that the data line outputs the first polarity voltage; Wherein, the first current signal is greater than the second current signal.

[0011] In an embodiment, the second current signal corresponding to the first refresh rate is greater than the second current signal corresponding to the second refresh rate; and the first refresh rate is greater than the second refresh rate.

[0012] To solve the above technical problems, a second technical solution adopted by the present application is to provide a display driving device, comprising: A timing control unit, the timing control unit is used to output a display control signal, the display control signal includes a valid display signal and a vertical blanking signal; A source driver connected to the timing control unit, for controlling the data line to output a first polarity voltage based on the valid display signal, and controlling the data line to output a second polarity voltage when the duration of the vertical blanking period reaches a preset time; wherein the first polarity voltage and the second polarity voltage are opposite in polarity.

[0013] In an embodiment, the source driver is also used to output a first current signal to the data line based on the valid display signal, so that the data line outputs the first polarity voltage based on the first current signal; and The source driver is also configured to output a second current signal to the data line to cause the data line to output the first polarity voltage when a duration of the vertical blanking period does not reach a preset time.

[0014] To solve the above technical problems, a third technical solution adopted by the present application is to provide a display device comprising: a display panel; a display driving device connected to the display panel, the display driving device being configured to drive the display panel by using any of the display driving methods described above.

[0015] The display driving method provided by the present application is different from the prior art. The display driving method comprises: outputting a first polarity voltage by a data line in response to an effective display signal; outputting a second polarity voltage by the data line in response to a vertical blanking signal and in response to a duration of the vertical blanking period reaching a preset time; and the first polarity voltage and the second polarity voltage being opposite in polarity. The display driving method of the present application can accelerate the leakage current, reduce the brightness at a high refresh rate, and reduce the difference in brightness between the high refresh rate and the low refresh rate, thereby improving the screen flicker phenomenon during the refresh rate switching by delaying the polarity switching time. BRIEF DESCRIPTION OF DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0017] Figure 1 a flowchart of a first embodiment of the display driving method of the present application; Figure 2 a structural diagram of an embodiment of the display device of the present application; Figure 3 a timing diagram of an embodiment of the display driving method of the present application; Figure 4 a timing diagram of a display driving method of the prior art; Figure 5 a flowchart of a second embodiment of the display driving method of the present application; Figure 6 a structural diagram of an embodiment of the display driving device of the present application.

[0018] Explanation of reference signs: display device 100, display panel 110, display driving device 120, data line Data, scanning line Gate, pixel 10, display control signal DE, polarity switching point POL, preset time n, effective display period T1, vertical blanking period T2, timing control unit 61, source driver 62. DETAILED DESCRIPTION

[0019] The scheme of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0020] In the following description, for the purpose of explanation and not limitation, specific details are set forth, such as particular system configurations, interfaces, techniques, in order to provide a thorough understanding of the present application.

[0021] The term "and / or", herein, is merely an associated relationship of the associated objects, and means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects. In addition, "multiple" herein means two or more than two.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used herein are merely for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0023] Before the embodiments of the present application are further described in detail, the terms and phrases involved in the embodiments of the present application are explained, and the terms and phrases involved in the embodiments of the present application are applicable to the following explanations.

[0024] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Please refer to Figure 1 , Figure 1 The flowchart of the first embodiment of the display driving method of the present application is shown, which specifically includes: Step S11: In response to the effective display signal, the data line outputs the first polarity voltage.

[0026] The display driving method of the present application is used to drive a display panel such as a liquid crystal display panel, in combination with Figure 2 , Figure 2 The structural diagram of an embodiment of the display device provided by the present application is shown. The display device 100 includes a display panel 110 and a display driving device 120, and the display driving device 120 is electrically connected with the display panel 110.

[0027] The time for the display panel 110 to display a frame of picture includes an active display period and a vertical blanking period. The display panel 110 includes a plurality of data lines Data arranged in the X direction and a plurality of scan lines Gate arranged in the Y direction. The display panel 110 further includes a plurality of pixels 10 arranged in an array. Each row of pixels 10 is connected to a scan line Gate, and each column of pixels 10 is connected to a data line Data. Specifically, each pixel 10 includes a TFT, the gate of which is connected to a scan line Gate, the source of which is connected to a data line Data, and the drain of which is connected to a pixel electrode. During scanning, the TFT is turned on by receiving a scan signal, and the voltage output by the data line Data is used to charge the pixel electrode.

[0028] The display driving apparatus 120 includes a timing control unit and a source driver. Figure 3 During control of the display panel 110, the timing control unit is configured to output a display control signal DE, which includes an active display signal and a vertical blanking signal. As shown in Figure 3 The high level of the display control signal DE is the active display signal, and the low level is the vertical blanking signal. It can be understood that the display panel 110 performs one frame of scanning display when receiving the active display signal and enters the vertical blanking period when receiving the vertical blanking signal.

[0029] In the display driving method of the present application, in response to the active display signal, i.e., the high level of the display control signal DE, the display panel 110 is in the active display period, and the data line Data outputs a first polarity voltage.

[0030] Step S12: In response to the vertical blanking signal and in response to the duration of the vertical blanking period reaching a preset time, the data line outputs a second polarity voltage; the first polarity voltage and the second polarity voltage are opposite in polarity.

[0031] In an embodiment, when the vertical blanking signal is received, the vertical blanking period is entered, and when the duration of the vertical blanking period reaches the preset time, the data line Data performs polarity switching and outputs the second polarity voltage.

[0032] It can be understood that the first polarity voltage and the second polarity voltage are opposite. For example, if the first polarity voltage is a positive polarity voltage, the second polarity voltage is a negative polarity voltage; if the first polarity voltage is a negative polarity voltage, the second polarity voltage is a positive polarity voltage. In combination with Figure 3, during the effective display period of the Nth frame, i.e. during T1, the first polarity voltage output by the data line Data is a positive polarity voltage, during the vertical blanking period, i.e. during T2, and the duration of the vertical blanking period reaches the preset time n, the second polarity voltage is output by the data line Data, and the output second polarity voltage is a negative polarity voltage. During the effective display period of the N+1th frame, i.e. during T1, the data line Data continues to output the negative polarity voltage, which is used as the first polarity voltage, during the vertical blanking period, i.e. during T2, and the duration of the vertical blanking period reaches the preset time n, the second polarity voltage is output by the data line Data, and the output second polarity voltage is a positive polarity voltage. It can be understood that during one frame of display (including the effective display period T1 and the vertical blanking period T2), the data line Data performs polarity switching once, and the polarity switching point POL is located at the preset time n of the vertical blanking period.

[0033] It should be noted that in the prior art, in combination with Figure 4 , the polarity switching point POL of the data line Data is generally located at the beginning of the vertical blanking period T2, for example, the data line Data performs polarity switching when the vertical blanking signal is received (in this case, the leakage is minimal for high refresh rate and low refresh rate). The polarity switching of the data line Data will switch the +32 gray scale of the previous frame to the -32 gray scale of the next frame, which will cause a voltage change. The TFT device in the pixel 10 is not a completely ideal device, and once there is a voltage difference Vds between the source and the drain, there will still be leakage after being turned off, and the greater the voltage difference Vds, the longer the leakage time, and the more serious the leakage. During the vertical blanking period, the TFT in all pixels is in the off state, and the longer the vertical blanking period, the longer the leakage time. In combination with different refresh rates, under low refresh rate, the leakage time is long and the leakage is more serious due to the longer vertical blanking period; and under high refresh rate, the leakage time is short and the leakage is less due to the shorter vertical blanking period; therefore, when the high and low refresh frequencies are quickly switched, the pixel display brightness changes greatly, and the user can feel obvious flicker with naked eyes.

[0034] The display driving method of the present application delays the polarity switching point POL of the data line Data, performs polarity switching and outputs the second polarity voltage when the vertical blanking period comes and the duration of the vertical blanking period reaches the preset time n. In this way, the leakage under high refresh rate can be accelerated, the leakage under high refresh rate is more serious, the brightness difference between high refresh rate and low refresh rate is reduced, and in an ideal state, the leakage under high refresh rate is the same as the brightness under low refresh rate, and the pixel display brightness change is reduced when the high and low refresh frequencies are quickly switched.

[0035] In an embodiment, the preset time corresponding to each display frame at different refresh rates is the same, and the preset time is determined by the total time of the vertical blanking period at the highest refresh rate.

[0036] Specifically, taking a display screen with 240Hz FHD as an example, at a refresh rate of 48HZ, the effective display period T1 has 1080 rows, and the vertical blanking period T2 has 4470 rows; at a refresh rate of 240HZ, the effective display period T1 also has 1080 rows, and the vertical blanking period T2 has only 30 rows. Therefore, in order to ensure that the preset time corresponding to each display frame at different refresh rates is the same, the preset time n cannot exceed the total time of scanning 30 rows.

[0037] In an embodiment, the preset time n can be set to be less than the time of scanning 30 rows, for example, to be the time of scanning 28 rows, so that, at a refresh rate of 240HZ, when the duration of the vertical blanking period reaches the time of scanning 28 rows, that is, the preset time n, the data line Data performs polarity switching, that is, the polarity switching point POL corresponds to the preset time n. At a refresh rate of 48HZ, when the duration of the vertical blanking period reaches the time of scanning 28 rows, that is, the preset time n, the data line Data performs polarity switching.

[0038] In another embodiment, the preset time n can be set to be the total time of scanning 30 rows. In this way, regardless of the change of the refresh rate, when the duration of the vertical blanking period T2 reaches the preset time n of scanning 30 rows, the data line Data performs polarity switching.

[0039] It should be noted that, at a refresh rate of 240HZ, the time difference from the polarity switching point POL of the Nth frame to the mth row of the N+1th frame is represented as ; wherein 240 represents 240HZ, 1110 represents the total number of rows (30+1080) of the vertical blanking period T2 and the effective display period T1, and n represents the time of scanning n rows. In this way, in a unit of time, such as 1 second, the total time for the voltage on the data line Data to change to the mth row of the N+1th frame is: .

[0040] At a refresh rate of 48HZ, the time difference from the polarity switching point POL of the Nth frame to the mth row of the N+1th frame is represented as ; wherein 48 represents 48HZ, 5550 represents the total number of rows (4470+1080) of the vertical blanking period T2 and the effective display period T1, and n represents the time of scanning n rows. In this way, in a unit of time, such as 1 second, the total time for the voltage on the data line Data to change to the mth row of the N+1th frame is: .

[0041] For the refresh rate of 240HZ, the leakage time increases by 1 row of refresh time for each preset time For the refresh rate of 48HZ, the leakage time increases by 1 row of refresh time for each preset time Therefore, for high refresh rate, the polarity switching point POL is delayed, the leakage time increases more, and the leakage is more serious. For low refresh rate, the leakage time is less, and the leakage is less. In this way, the display brightness under high refresh rate can be reduced, so that the brightness is as same as the brightness under low refresh rate as possible. When the high and low refresh frequencies are quickly switched, the pixel display brightness change is reduced.

[0042] It should be noted that the preset time n is set as the total time of scanning 30 rows, which can accelerate the leakage to the maximum extent under the refresh rate of 240HZ compared with the prior art, and can have a small improvement in leakage under the refresh rate of 48HZ compared with the prior art. However, since the leakage is more under high refresh rate, the brightness difference between high refresh rate and low refresh rate can be reduced to a certain extent.

[0043] It should be noted that in response to the vertical blanking signal, and the duration of the vertical blanking period does not reach the preset time, the data line Data outputs the first polarity voltage. It can be understood that when the vertical blanking signal is received, the vertical blanking period is entered, and when the duration of the vertical blanking period does not reach the preset time, the data line Data does not perform polarity switching and continuously outputs the first polarity voltage. When the duration of the vertical blanking period reaches the preset time, the data line Data performs polarity switching and outputs the second polarity voltage.

[0044] As described above, the preset time n is set as the total time of scanning 30 rows, so that when the vertical blanking signal is received, the vertical blanking period is entered, and when the duration of the vertical blanking period does not reach the total time of scanning 30 rows, the data line Data does not perform polarity switching and continuously outputs the first polarity voltage.

[0045] In the above embodiment, the preset time corresponding to each display frame under different refresh rates is set to be the same, which can simplify the control process and improve the response speed.

[0046] In another specific embodiment of the present application, the preset time is determined by the refresh rate of the current display frame; wherein the preset time is positively related to the refresh rate of the current display frame.

[0047] In one specific embodiment, the preset time n takes a value of [0, Z], and Z represents the total time of the vertical blanking period of the highest refresh rate.

[0048] It can be understood that, since the preset time is positively correlated with the refresh rate of the current display frame, the preset time is longest when the refresh rate of the current display frame is highest, and the preset time is shortest when the refresh rate of the current display frame is lowest.

[0049] Taking a display screen with 240Hz FHD as an example, the highest refresh rate is 240HZ, and the lowest refresh rate is 48HZ. Since there are only 30 lines in the vertical blanking period T2 under the highest refresh rate 240HZ, Z is the total time of scanning 30 lines. Therefore, when the refresh rate of the current display frame is highest, for example, 240HZ, the preset time n is longest, for example, the total time of scanning 30 lines; when the refresh rate of the current display frame is lowest, for example, 48HZ, the preset time n is shortest, for example, the time of scanning 0 line (i.e. the start time of the vertical blanking period).

[0050] It can be understood that, if the refresh rate of the current display frame is 120HZ, the preset time n takes a middle value of [0, Z], for example, the preset time n is the time of scanning 15 lines, and the specific value is not limited. In an embodiment, the preset time corresponding to the refresh rate can be selected in [0, Z] based on a linear change rule.

[0051] In combination with Table (1), Table (1) is the corresponding brightness change parameter after the polarity switching point POL is modified in the present application.

[0052]

[0053] Table (1) The above Table (1) contains freesync test values of different gray scales corresponding to different preset times, which is used to quantify the flicker degree, generally negative, and the greater the absolute value, the weaker the flicker, and the better the display stability. As can be seen from the above Table (1), when the preset time is the time corresponding to scanning 30 lines, the absolute value of the freesync test value under each gray scale is the largest, so if the preset time is the same under multiple refresh rates, the preset time can be set to the time corresponding to scanning 30 lines, so that more current leakage under high refresh rate can be ensured, and the brightness difference between high refresh rate and low refresh rate is reduced.

[0054] The method of the present embodiment sets the corresponding preset time based on the refresh rate corresponding to each frame, which can flexibly control the current leakage time of each frame, and maximally reduces the display brightness under high refresh rate, so that the brightness is as same as the brightness under low refresh rate as possible.

[0055] In combination with Figure 5 , Figure 5 FIG. 1 is a flowchart of a display driving method according to a first embodiment of the present application, which specifically includes the following steps. Step S51: In response to the valid display signal, the source driver outputs a first current signal to the data line, so that the data line outputs a first polarity voltage based on the first current signal.

[0056] As in the above embodiment, when the valid display signal is received, the display panel is in the valid display period. In this process, the source driver outputs a first current signal to the data line Data, so that the data line Data outputs a first polarity voltage based on the first current signal.

[0057] It should be noted that the source driver has a data line Data output circuit which is composed of an operational amplifier. The current level output by the data line Data output circuit of the source driver determines the driving capability of the data line Data. During the valid display period, the source driver outputs a matching first current signal according to the driving capability required by the display panel.

[0058] Step S52: In response to the vertical blanking signal, and when the duration of the vertical blanking period does not reach the preset time, the source driver outputs a second current signal to the data line, so that the data line outputs a first polarity voltage.

[0059] When the vertical blanking signal is received, and when the duration of the vertical blanking period does not reach the preset time, the data line Data does not perform polarity switching and continuously outputs the first polarity voltage. In order to reduce the leakage current, the source driver outputs a second current signal to the data line Data, so that the data line Data outputs the first polarity voltage.

[0060] It should be noted that the second current signal is smaller than the first current signal. In an embodiment, during the valid display period, the source driver outputs a first current signal of the maximum current level, which can improve the driving capability and quickly charge and discharge. During the vertical blanking period (when the duration of the vertical blanking period does not reach the preset time), the source driver reduces the current level and outputs a second current signal to the data line Data, which can reduce the leakage current.

[0061] As in the above embodiment, the scheme of the present application needs to ensure the maximum acceleration of leakage at a high refresh rate, and can control a small leakage at a low refresh rate. On this basis, the second current signal corresponding to the first refresh rate is further set to be greater than the second current signal corresponding to the second refresh rate; and the first refresh rate is greater than the second refresh rate. Specifically, the second current signal output by the source driver at the high refresh rate is set to be greater than the second current signal output by the source driver at the low refresh rate. In this way, the driving capability at the refresh rate can be ensured to be greater than the driving capability at the low refresh rate, so that the leakage at the high refresh rate is more, the brightness is reduced, and the brightness at the low refresh rate is closer, thereby reducing the brightness difference between the high refresh rate and the low refresh rate.

[0062] Step S53: in response to the vertical blanking signal, and in response to the duration of the vertical blanking period reaching a preset time, the data line outputs a second polarity voltage.

[0063] Step S53 is the same as step S12 shown in the above Figure 1 and will not be repeated here.

[0064] Specifically, it is assumed that the source driver sets current gears 1, 2, 3, and 4, where gear 4 corresponds to the largest current and gear 1 corresponds to the smallest current. The refresh rate of the current display frame is 240HZ. When the valid display signal is received, the display panel is in the valid display period. During this process, it is necessary to ensure sufficient driving capability, so the source driver outputs a first current signal corresponding to gear 4 to the data line Data, so that the data line Data outputs a first polarity voltage based on the first current signal. When the vertical blanking signal is received and the duration of the vertical blanking period does not reach the preset time, the source driver reduces the current gear and outputs a second current signal corresponding to gear 3 to the data line Data, so that the data line Data outputs a first polarity voltage based on the second current signal. When the duration of the vertical blanking period reaches the preset time, the source driver outputs a first current signal corresponding to gear 4 to the data line Data, so that the data line Data performs polarity switching and outputs a second polarity voltage. When the refresh rate is 48HZ, when the vertical blanking signal is received and the duration of the vertical blanking period does not reach the preset time, the source driver reduces the current gear and outputs a second current signal corresponding to gear 1 to the data line Data, so that the data line Data outputs a first polarity voltage based on the second current signal.

[0065] The display driving method of the present application accelerates the leakage of high refresh rate by changing the polarity switching point and the current gear output by the source driver, thereby ensuring that the leakage under high refresh rate is more, the brightness is reduced, and the brightness under low refresh rate is closer, reducing the brightness difference between high refresh rate and low refresh rate.

[0066] Further, in combination with Figure 6 The present application also provides a display driving device 120, which comprises a timing control unit 61 and a source driver 62; wherein the timing control unit 61 is used to output a display control signal, and the display control signal comprises a valid display signal and a vertical blanking signal; the source driver 62 is connected to the timing control unit 61, and is used to control the data line Data to output a first polarity voltage based on the valid display signal, and to control the data line Data to output a second polarity voltage when the duration of the vertical blanking period reaches a preset time; wherein the first polarity voltage and the second polarity voltage are opposite in polarity.

[0067] In an embodiment, the source driver 62 is further configured to output a first current signal to the data line Data based on the effective display signal, so that the data line Data outputs a first polarity voltage based on the first current signal; and output a second current signal to the data line Data when a duration of the vertical blanking period does not reach a preset time, so that the data line Data outputs the first polarity voltage.

[0068] The display driving apparatus 120 of the embodiment can implement the display driving method of the embodiment. Details are as described above and will not be repeated here.

[0069] Referring to Figure 2 , Figure 2 A structural schematic diagram of an embodiment of a display device provided by the present application is shown in FIG. 1. The display device 100 includes a display panel 110 and a display driving apparatus 120, and the display driving apparatus 120 is electrically connected to the display panel 110. The display driving apparatus 120 can implement the display driving method of the embodiment. Details are as described above and will not be repeated here.

[0070] The above merely illustrates the embodiments of the present application, and does not limit the patent protection scope of the present application. Any equivalent structure or equivalent process conversion using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display driving method, characterized by, The method comprises: in response to a valid display signal, a data line outputs a first polarity voltage; in response to a vertical blanking signal, and in response to a duration of a vertical blanking period reaching a preset time, the data line outputs a second polarity voltage; the first polarity voltage and the second polarity voltage are opposite in polarity.

2. The display driving method according to claim 1, wherein in response to the vertical blanking signal, and in response to the duration of the vertical blanking period not reaching the preset time, the data line outputs the first polarity voltage.

3. The display driving method according to claim 1, wherein The preset time is the same for each display frame at different refresh rates, and is determined by a total time of a vertical blanking period at a highest refresh rate.

4. The display driving method according to claim 1, wherein The preset time is determined by a refresh rate of a current display frame; wherein the preset time is positively correlated with the refresh rate of the current display frame.

5. The display driving method according to claim 4, wherein The preset time takes a value of [0, Z], and Z represents a total time of a vertical blanking period at a highest refresh rate.

6. The display driving method according to claim 2, wherein in response to a valid display signal, a data line outputs a first polarity voltage, comprising: in response to the valid display signal, a source driver outputs a first current signal to the data line, so that the data line outputs the first polarity voltage based on the first current signal; in response to the vertical blanking signal, and in response to the duration of the vertical blanking period not reaching the preset time, the data line outputs the first polarity voltage, comprising: in response to the vertical blanking signal, and in response to the duration of the vertical blanking period not reaching the preset time, the source driver outputs a second current signal to the data line, so that the data line outputs the first polarity voltage; wherein the first current signal is greater than the second current signal.

7. The display driving method according to claim 6, wherein The second current signal corresponding to a first refresh rate is greater than the second current signal corresponding to a second refresh rate; and the first refresh rate is greater than the second refresh rate.

8. A display driving device, characterized by comprising: The method comprises: a timing control unit, configured to output a display control signal, the display control signal comprising a valid display signal and a vertical blanking signal; a source driver, connected to the timing control unit, configured to control a data line to output a first polarity voltage based on the valid display signal, and to control the data line to output a second polarity voltage when a duration of a vertical blanking period reaches a preset time; wherein the first polarity voltage and the second polarity voltage are opposite in polarity.

9. The display driving apparatus according to claim 8, wherein the source driver is further configured to output a first current signal to the data line based on the valid display signal, so that the data line outputs the first polarity voltage based on the first current signal; and the source driver is further configured to output a second current signal to the data line when the duration of the vertical blanking period does not reach the preset time, so that the data line outputs the first polarity voltage.

10. A display device comprising: The method comprises: a display panel; a display driving device, connected to the display panel, configured to drive the display panel by using the display driving method according to any one of the preceding claims 1 to 7.

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