Display device driving method, driving circuit, and display device

Abstract

The present application discloses a driving method, a driving circuit, and a display device for a display device. The driving method includes the following steps: obtaining the refresh rates of the current frame and the next frame of the display device; comparing the refresh rates of the current frame and the next frame; if the refresh rate of the current frame is greater than the refresh rate of the next frame, generating a corresponding scanning signal according to the refresh rate parameters of the current frame within a first time period of the next frame, controlling the thin-film transistors on each row of the scanning line to turn on row by row; and turning off all thin-film transistors corresponding to all scanning lines within a second time period of the next frame; if the refresh rate of the current frame is less than the refresh rate of the next frame, generating a corresponding scanning signal according to the refresh rate parameters of the next frame within a frame time of the next frame, controlling the thin-film transistors on each row of the scanning line to turn on row by row. The present application controls the on-time of the scanning line by controlling the driving signal on the scanning line, thereby achieving refresh frequency switching, supporting low-frequency display, and reducing power consumption.

Description

Technical Field

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

[0002] GOA (Gate On Array) technology involves fabricating the gate driver circuit on the array substrate, replacing an external integrated circuit (IC) to drive the horizontal scan lines. This technology reduces the need for external IC bonding, potentially increasing production capacity and reducing product costs. It also makes LCD devices more suitable for narrow-border or borderless display products. GOA technology allows the gate driver to be fabricated on the thin-film transistor array substrate, saving space and the cost of the driver IC.

[0003] As users become more demanding of monitors, the higher the refresh rate, the greater the power consumption. For monitors used in e-sports applications, for example, e-sports requires high refresh rates such as 240Hz and 120Hz, while watching videos only requires 60Hz. Browsing the web and reading emails require a lower frequency, such as 30Hz. Furthermore, for still images, such as wallpapers, a frequency of less than 10Hz is sufficient. Due to existing monitor technology, the frequency is fixed, and the hardware cannot support very low frequencies. If the scanning circuit can be driven by circuit control to achieve switching between various application scenarios, power consumption can be greatly reduced, saving energy costs. Therefore, developing a circuit to reduce power consumption and support low frequencies is an urgent problem that display technicians need to solve. Summary of the Invention

[0004] The purpose of this application is to provide a driving method, a driving circuit and a display device for a display device, which can change the refresh frequency by controlling the scanning circuit to reduce power consumption and support low-frequency display at the same time.

[0005] The present application discloses a driving method for a display device, the driving method comprising the steps of:

[0006] Obtaining the refresh rates of the current frame and the next frame of the display device; and

[0007] Comparing the refresh rate of the current frame with the refresh rate of the next frame, if the refresh rate of the current frame is greater than the refresh rate of the next frame, activating the first display mode to drive the display device for display; if the refresh rate of the current frame is less than the refresh rate of the next frame, activating the second display mode to drive the display device for display;

[0008] The first display mode specifically includes the following steps:

[0009] In the first time period of the next frame, a corresponding scanning signal is generated according to the refresh rate parameter of the current frame to control the thin film transistors on each scan line to turn on row by row, and in the second time period of the next frame, the thin film transistors corresponding to all scan lines are turned off;

[0010] The specific steps of the second display mode include:

[0011] During the next frame time, a corresponding scanning signal is generated according to the next frame refresh rate parameter to control the thin film transistors on each scan line to turn on row by row;

[0012] The length of the first time period is equal to the length of one frame corresponding to the current frame refresh rate, and the length of the second time period is n times the length of the first time period, where n is a positive number.

[0013] Optionally, the step of generating a corresponding scan signal according to a refresh rate parameter of the current frame in a first time period of the next frame to control the thin film transistors on each scan line to turn on row by row; and turning off all thin film transistors corresponding to all scan lines in a second time period of the next frame includes:

[0014] In the first time period of the next frame, the frame start signal of the current frame refresh rate is input to control the thin film transistors on each row of the scan line to open row by row; in the second time period of the next frame, the frequency control circuit is turned on and a low-level signal is input to the scan lines of all rows to turn off all the thin film transistors corresponding to all the scan lines.

[0015] Optionally, the step of generating a corresponding scan signal according to a refresh rate parameter of the current frame in a first time period of the next frame to control the thin film transistors on each scan line to turn on row by row; and turning off all thin film transistors corresponding to all scan lines in a second time period of the next frame includes:

[0016] In the first time period of the next frame, the frame start signal of the current frame refresh rate is input to control the thin film transistors on each row of the scan line to open row by row; in the second time period of the next frame, the frame start signal of the current frame refresh rate is turned off, and the scan signals of all rows of scan lines are input at a low level to turn off all the thin film transistors corresponding to all the scan lines.

[0017] Optionally, the first time period is in front, the second time period is after the first time period and they are set continuously. In the first display mode, the sum of the values ​​of the first time period and the second time period of the next frame is equal to one frame time of the current frame.

[0018] Optionally, the current frame refresh rate is F1, the next frame refresh rate is F2, the frame duration corresponding to the current frame refresh rate is T1, and the frame duration corresponding to the next frame refresh rate is T2; the first time period is t1, and the second time period is t2;

[0019] Among them, T1=t1, T2=t1+t2, F1 / F2=t1+t2 / t1.

[0020] Optionally, the step of generating a corresponding scan signal according to a refresh rate parameter of the current frame in a first time period of the next frame, controlling the thin film transistors on each scan line to turn on row by row, and turning off all thin film transistors corresponding to all scan lines in a second time period of the next frame includes:

[0021] Generate a value of a second time period of the next frame according to a ratio of the refresh rates of the current frame and the next frame and a value of the first time period;

[0022] Wherein, t2 = (F1 / F2-1)*t1.

[0023] Optionally, the step of generating a corresponding scan signal according to a refresh rate parameter of the current frame in a first time period of the next frame, controlling the thin film transistors on each scan line to turn on row by row, and turning off all thin film transistors corresponding to all scan lines in a second time period of the next frame includes:

[0024] During the first time period, a first common level is controlled to be input to the common line corresponding to the display device; during the second time period, a second common level is controlled to be input to the common line corresponding to the display device;

[0025] The voltage value of the second common level is smaller than the voltage value of the first common level.

[0026] The present application also provides a driving circuit for a display device, which drives the display device using any of the driving methods described above, wherein the driving circuit includes a gate driving circuit and a frequency control circuit, wherein the gate driving circuit generates a gate driving signal to the corresponding scan line of the display device according to the current refresh rate; the frequency control circuit is arranged between the scan line and the gate driving circuit; wherein the frequency control circuit changes the gate driving signal output by the gate driving unit to control the on time of the scan line in each frame, and generates a gate driving signal corresponding to a new refresh rate to the display device for refreshing the display.

[0027] Optionally, the gate drive circuit includes multiple gate drive units, with each gate drive unit corresponding to a frequency control circuit, and the frequency control circuit includes a gate signal input module, a gate signal pull-down module and a frequency pull-down module, the control end and input end of the gate signal input module are connected to the output end of the gate drive unit corresponding to the previous row of scan lines, and the output end of the gate signal is connected to the input end of the scan line; the control end of the gate signal pull-down module is connected to the output end of the gate drive unit corresponding to the current row of scan lines, the input end is connected to the first level signal input end of the gate drive unit, and the output end is connected to the output end of the gate signal input module; the control end of the frequency pull-down module is connected to the output end of the frequency control voltage, the input end is connected to the first level signal input end of the gate drive unit, and the output end is connected to the output end of the gate signal input module; wherein, after the current frame scan is completed, when the frequency control circuit is a second level signal during the next frame scan, the frequency pull-down module controls all gate signals to be low level input to all the scan lines.

[0028] The present application also discloses a display device, which includes a driving circuit, a timing control module, and a refresh rate acquisition and comparison module as described above. The timing control module outputs a clock signal and a frame start signal to the gate driving circuit of the driving circuit. The refresh acquisition and comparison module is connected to the frequency control circuit of the driving circuit to control the operation of the frequency control circuit to change the gate driving signal output by the gate driving unit, control the opening time of the scanning line in each frame, and generate a gate driving signal corresponding to a new refresh rate to the display device for refreshing the display.

[0029] Compared with the solution of changing the refresh frequency through hardware, the present application provides a new type of driving circuit. When the refresh frequency is switched, the refresh rate of the display device is switched mainly by changing the gate drive signal input to the scan line. If the refresh rate of the current frame is greater than the refresh rate of the next frame, in the first time period of the next frame, the corresponding scanning signal or gate drive signal is generated according to the refresh rate parameter of the current frame to control the thin film transistors on each row of the scan line to turn on row by row, and in the second time period of the next frame, all the thin film transistors corresponding to all the scan lines are turned off; if the refresh rate of the current frame is less than the refresh rate of the next frame, in one frame time of the next frame, the corresponding scanning signal is generated according to the refresh rate parameter of the next frame to control the thin film transistors on each row of the scan line to turn on row by row; by controlling the drive signal on the scan line to control the turn-on time of the scan line, the switching of the refresh frequency is realized, thereby achieving a lower frequency refresh, reducing power consumption, and saving energy costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0031] Figure 1 This is a schematic flow chart of a driving method for a display device according to the first embodiment of the present application;

[0032] Figure 2 2 is a schematic diagram of a refresh rate switching waveform of the first embodiment of the present application;

[0033] Figure 3 is a flowchart of a driving method according to a second embodiment of the present application;

[0034] Figure 4 1 is a schematic diagram of a refresh rate switching waveform and a common voltage waveform according to the third embodiment of the present application;

[0035] Figure 5 is a schematic structural diagram of a driving circuit according to a fourth embodiment of the present application;

[0036] Figure 6 is a schematic structural diagram of a driving circuit according to a fifth embodiment of the present application;

[0037] Figure 7 is a schematic structural diagram of a driving circuit according to a sixth embodiment of the present application;

[0038] Figure 8 This is a schematic diagram of the 240 Hz to 120 Hz frequency waveform of the present application;

[0039] Figure 9 This is a schematic diagram of the 240 Hz to 60 Hz frequency waveform of this application;

[0040] Figure 10 This is a schematic diagram of the 240 Hz switching 240 Hz frequency waveform of the present application;

[0041] Figure 11 It is a structural schematic diagram of a display device according to the seventh embodiment of the present application.

[0042] Among them, 100, display device; 110, scan line; 200, drive circuit; 210, gate drive circuit; 211, gate drive unit; 220, frequency control circuit; 221, gate signal input module; 222, gate signal pull-down module; 223, frequency pull-down module; 300, timing control module; 400, refresh rate acquisition and comparison module. DETAILED DESCRIPTION

[0043] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative. However, the present application can be implemented in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0044] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate relative importance or implicitly specify the quantity of the technical features indicated. Therefore, unless otherwise specified, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features; "plurality" means two or more. The term "comprising" and any variations thereof are intended to be non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0045] In addition, terms indicating orientation or positional relationships such as “center,” “lateral,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside” are described based on the orientation or relative positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present application, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0046] Furthermore, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0047] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0048] like Figure 1 As shown, as a first embodiment of the present application, a driving method for a display device is disclosed, the driving method comprising the steps of:

[0049] S1: Obtain the refresh rate of the current frame and the next frame of the display device; and

[0050] S2: comparing the refresh rate of the current frame with the refresh rate of the next frame; if the refresh rate of the current frame is greater than the refresh rate of the next frame, activating the first display mode to drive the display device for display; if the refresh rate of the current frame is less than the refresh rate of the next frame, activating the second display mode to drive the display device for display;

[0051] The first display mode specifically includes the following steps:

[0052] V1: In the first time period of the next frame, the corresponding scanning signal is generated according to the refresh rate parameters of the current frame, and the thin film transistors on each scan line are turned on row by row. In the second time period of the next frame, the thin film transistors corresponding to all scan lines are turned off;

[0053] The specific steps of the second display mode include:

[0054] W1: Generates the corresponding scan signal according to the next frame refresh rate parameter within the next frame time, and controls the thin film transistors on each scan line to turn on row by row;

[0055] Among them, the length of the first time period is equal to the length of one frame corresponding to the current frame refresh rate, and the length of the second time period is n times the length of the first time period, where n is a positive number. The length of the second time period may be an integer multiple of the first time length or may not be an integer multiple.

[0056] In this embodiment, by comparing the refresh rates of the previous and next frames, different display modes are used to drive the display. If the refresh rate of the current frame is greater than the refresh rate of the next frame, a corresponding scan signal is generated according to the refresh rate parameters of the current frame in the first time period of the next frame, and the thin film transistors on each row of the scan line are controlled to be turned on row by row. In the second time period of the next frame, all the thin film transistors corresponding to the scan lines are turned off. If the refresh rate of the current frame is less than the refresh rate of the next frame, a corresponding scan signal is generated according to the refresh rate parameters of the next frame in one frame time of the next frame, and the thin film transistors on each row of the scan line are controlled to be turned on row by row. When the refresh rate changes from a high refresh rate to a low refresh rate, the gate drive signal corresponding to the high refresh rate is still used in the first time period of the low refresh rate. The display is driven by the gate drive signal generated by the current refresh rate, and in the second time period, the gate drive signal generated by the current refresh rate is not input to the scan line, or the scan line signals are all pulled low. In fact, the gate drive signal of the current frame refresh rate is used for driving, but the gate drive signal is only input once in the two frame time corresponding to the current frame refresh rate, and the thin film transistor on the scan line is only turned on once. Therefore, the display result is actually only scanned once in the two frame time corresponding to the display result, and the time is doubled, so the refresh rate is reduced by half, that is, the opening time of the scan line is controlled by controlling the drive signal on the scan line, thereby realizing the switching of the refresh frequency, supporting low-frequency display, and reducing power consumption. Compared with the solution of changing the clock signal to make the gate drive signal pulse width different, the change implemented in this embodiment is simpler and more convenient.

[0057] Furthermore, the switching from a high refresh rate to a low refresh rate is mainly used as an example for explanation, and the step V1 includes:

[0058] In the first time period of the next frame, the frame start signal of the current frame refresh rate is input to control the thin film transistors on each row of the scan line to open row by row; in the second time period of the next frame, the frequency control circuit is turned on and a low-level signal is input to the scan lines of all rows to turn off all the thin film transistors corresponding to all the scan lines.

[0059] It should be noted that the waveforms of the gate drive signal and the scan signal in this embodiment are exactly the same and can be understood as the same signal; the gate drive signal corresponds to the scan signal corresponding to the current frame refresh rate, and the scan signal is the gate drive signal corresponding to the next frame refresh.

[0060] refer to Figure 2As shown, taking the current frame as 240hz and the next frame as 120hz as an example, the gate drive signal input to the scan line is turned off by controlling the frame start, so that when the next frame refresh rate is used to drive the display, the frame start signal of each frame corresponding to the refresh rate of the current frame is input once for two frames, and the gate drive signal corresponding to the refresh rate of the current frame is input once for two frames, so it can be calculated that the period of the gate drive signal of the next frame is twice that of the current frame, so the refresh rate of the next frame is reduced by half.

[0061] The first time period is in front, and the second time period is after the first time period and is continuously set. In the first display mode, the sum of the first time period and the second time period of the next frame is equal to one frame time of the current frame.

[0062] Switching of other refresh rates can be limited by the following corresponding formulas to control the actual input duration of the corresponding scanning signal, or the turn-on duration of the thin film transistor corresponding to the scanning line; the current frame refresh rate is F1, the next frame refresh rate is F2, the frame duration corresponding to the current frame refresh rate is T1, and the frame duration corresponding to the next frame refresh rate is T2; the first time period is t1, and the second time period is t2;

[0063] Among them, T1=t1, T2=t1+t2, F1 / F2=t1+t2 / t1.

[0064] The steps of generating a corresponding scanning signal according to the refresh rate parameter of the current frame in the first time period of the next frame, controlling the thin film transistors on each scan line to turn on row by row, and turning off all the thin film transistors corresponding to all the scan lines in the second time period of the next frame include:

[0065] Generate a value of a second time period of the next frame according to a ratio of the refresh rates of the current frame and the next frame and a value of the first time period;

[0066] Wherein, t2 = (F1 / F2-1)*t1.

[0067] In addition, it should be noted that when switching from a low refresh rate to a high refresh rate, within the frame time of the next frame, the corresponding scanning signal is generated according to the refresh rate parameters of the next frame to control the thin film transistors on each row of the scanning line to open row by row. At this time, the gate drive signal generated by the refresh rate of the current frame is used for the next frame and is used once within the frame time of the next frame. Assuming that the refresh rate of the current frame is 120hz and the refresh rate of the next frame is 240hz, then the frame time of the current frame is equivalent to the two frame times of the next frame, and the gate drive signal generated based on the refresh rate of the current frame only drives the display within the first time period of the current frame. If you want to achieve the refresh rate of the next frame, the gate drive signal generated by the refresh rate parameters of the current frame must also be input to the thin film transistor of the scanning line in the second time period to turn on the scanning line to charge the pixel.

[0068] like Figure 3 As shown, as the second embodiment of the present application, different from the first embodiment described above, the driving method includes the steps of:

[0069] X1: Get the maximum refresh rate of the display device and the refresh rate of the next frame; and

[0070] X2: Compare the highest refresh rate with the refresh rate of the next frame. If the highest refresh rate is greater than the refresh rate of the next frame, generate a corresponding scan signal according to the highest refresh rate parameter in the first time period of the next frame, control the thin film transistors on each row of the scan line to open row by row, and turn off all the thin film transistors corresponding to all the scan lines in the second time period of the next frame. If the highest refresh rate is equal to the refresh rate of the next frame, generate a corresponding scan signal according to the highest frame refresh rate parameter in the frame time of the next frame, control the thin film transistors on each row of the scan line to open row by row.

[0071] The refresh rate of the next frame is compared with the highest refresh rate in the display device, that is, the highest refresh rate is used as the benchmark, and other refresh rates are obtained by changing the gate drive signal of the highest refresh rate. When it is less than the highest refresh rate, in the first time period of the next frame, the corresponding scanning signal is generated according to the highest refresh rate parameter, and the thin film transistors on each row of the scanning line are controlled to open row by row. In the second time period of the next frame, all the thin film transistors corresponding to all the scanning lines are turned off; if the highest refresh rate is equal to the refresh rate of the next frame, in one frame time of the next frame, the corresponding scanning signal is generated according to the highest frame refresh rate parameter, and the thin film transistors on each row of the scanning line are controlled to open row by row. The value of the second time period may be 1 to 10 times the value of the first time period, or even higher, depending on the difference in multiples between the highest refresh rate and the refresh rate of the next frame. No matter how low the refresh rate of the next frame is, it can be achieved using the improved driving circuit of the present application.

[0072] As the third embodiment of the present application, which further defines and improves the above embodiment, step V1 includes:

[0073] During the first time period, a first common level is controlled to be input to the common line corresponding to the display device; during the second time period, a second common level is controlled to be input to the common line corresponding to the display device;

[0074] The voltage value of the second common level is smaller than the voltage value of the first common level.

[0075] refer to Figure 4 As shown, considering that when driving the display at the next frame refresh rate, the gate drive signal corresponding to the previous frame refresh rate is actually used, the difference is that when using the next frame refresh rate, the gate drive signal corresponding to the refresh rate of the current frame is input within one frame time of the current frame, and the gate drive signal is maintained at a low level within one frame time, that is, the thin film transistor of the scanning line is kept disconnected. In this way, there is a difference in the voltage of the pixels of the two frames, and the corresponding common level is different from the voltage difference of the pixel charging voltage of the two frames of the current frame, and there will be a brightness difference. Therefore, in the first time period, the first common level VCOM1 is controlled to be input to the common line corresponding to the display device, and in the second time period, the second common level VCOM2 is controlled to be input to the common line corresponding to the display device. For the two frame times of the current frame (the first time period and the second time period of the next frame), the difference between the common level and the pixel charging voltage is close, so as to avoid obvious brightness difference and flickering problems.

[0076] Taking into account the various possibilities of refresh rate switching, such as switching from 60Hz to 120Hz and switching from 120Hz to 240Hz, and considering the different refresh rate differences, the more obvious the difference in brightness and darkness may be, the more forceful the change in common level is needed to improve the difference in brightness and darkness, so that it can be used for switching between different refresh rates.

[0077] like Figure 5 As shown, as the fourth embodiment of the present application, a driving circuit 200 of a display device is disclosed, which uses the driving method described in any of the above embodiments to drive the display device, and the driving circuit 200 includes a gate driving circuit 210 and a frequency control circuit 220. The gate driving circuit 210 generates a gate driving signal to the scanning line 110 corresponding to the display device according to the current refresh rate; the frequency control circuit 220 is arranged between the scanning line 110 and the gate driving circuit 210; wherein, the frequency control circuit 220 changes the gate driving signal output by the gate driving circuit 210 to control the opening time of the scanning line 110 in each frame, and generates a gate driving signal corresponding to a new refresh rate to the display device for refreshing the display.

[0078] Take the current frame as 240hz and the next frame as 120hz as an example for explanation, refer to Figure 2 and Figure 5 As shown, the gate drive signal waveform corresponding to the refresh rate of 240 Hz is different from the gate drive signal waveform corresponding to the refresh rate of 120 Hz, and the difference is that at 120 Hz, the time of one frame corresponding to 120 Hz is twice the time of one frame corresponding to 240 Hz, but at the refresh rate of 120 Hz, the gate drive signal corresponding to 240 Hz is only input once within the one frame time corresponding to 120 Hz. The change in refresh rate is mainly to control the cycle time of the scanning line, that is, the opening time of the thin film transistor corresponding to the scanning line. At the same time, under different refresh rates, the cycle of 240 Hz corresponding to one row of scanning lines is T1, and the gate drive signal is input once. The cycle of 120h corresponding to one row of scanning lines is T2, and the gate drive signal is input once. Different refresh rates are obtained when driving the display device to display, thereby reducing power consumption.

[0079] like Figure 6 As shown, as the fifth embodiment of the present application, it is a further refinement of the above-mentioned fourth embodiment. The gate drive circuit 210 includes a plurality of gate drive units 211. Taking each gate drive unit 211 corresponding to a frequency control circuit 220 as an example, the frequency control circuit 220 includes a gate signal input module 221, a gate signal pull-down module 222 and a frequency pull-down module 223. The control end and input end of the gate signal input module 221 are connected to the output end of the gate drive unit 210 corresponding to the previous row of scan lines 110, and the output end of the gate signal input module 221 is connected to the input end of the scan line 110; the control end of the gate signal pull-down module 222 is connected to the current row of scan lines 110. 0, the input end is connected to the first level signal input end of the gate driving unit 211, and the output end is connected to the output end of the gate signal input module 221; the control end of the frequency pull-down module 223 is connected to the output end of the frequency control voltage FCV, the input end is connected to the first level signal input end of the gate driving unit 211, the first level signal is the VSS signal, and the output end is connected to the output end of the gate signal input module 221; wherein, after the current frame scan is completed, when the next frame scan is performed, when the frequency control circuit 220 is the second level signal VGH, the frequency pull-down module 223 controls all gate signals to be low level and input to all the scanning lines 110.

[0080] This embodiment is a further refinement of the frequency control circuit of the above embodiment. The refresh rate is changed mainly by pulling down the gate drive signal so that the thin film transistor on the scan line remains turned off. That is, within the original two frames of 240 Hz, one frame inputs the gate drive signal to control the thin film transistor of the scan line to turn on. When one frame inputs the gate drive signal to the scan line, the gate drive signal is directly pulled down to a low level through the frequency pull-down module, and the thin film transistor of the scan line remains turned off. One frame works and the other frame does not work. Within the two frames corresponding to 240 Hz, if refreshed at 240 Hz, both frames work, but if refreshed at 120 Hz, only one frame works.

[0081] In addition, controlling the gate drive signal to be pulled down is a means to turn off the thin film transistor on the scan line. Of course, the above effect can also be achieved by directly controlling the frame start signal to directly turn off the output of the gate drive signal.

[0082] like Figure 7 As shown, as a sixth embodiment of the present application, the gate signal input module includes a first transistor M1, a second transistor M2 and a first capacitor C1, the gate signal pull-down module includes a third transistor M3, and the frame pull-down module includes a fourth transistor M4; the input end and the control end of the first transistor M1 are connected to the output end of the gate driving unit 211 of the previous row, and the output end is connected to the control end of the second transistor M2; the input end of the second transistor M2 is connected to the output end of the gate driving unit of the previous row, and the output end is connected to the input end of the scan line; the two ends of the first capacitor C1 are respectively connected to the control end and the output end of the second transistor M2; the control end of the third transistor M3 is connected to the output end of the current row gate driving unit, the input end is connected to the first level signal input end of the current row gate driving unit, and the output end is connected to the input end of the scan line; the control end of the fourth transistor is connected to the output end of the frequency control voltage, the input end is connected to the first level signal input end VSS of the current row gate driving unit, and the output end is connected to the input end of the scan line.

[0083] refer to Figure 7 and Figure 8As shown, the current frame is 240hz and the next frame is 120hz. When n=2, in the first frame, when Gout(1) outputs a high level, Gout(2) outputs a low voltage, the first transistor M1 is turned on, and the third transistor M3 is turned off. The gate of the second transistor M2 is written to Gout(1), at this time the second transistor M2 is turned on, and SCAN(2) is written to Gout(1). In this stage, the FCV signal is a low voltage and the fourth transistor M4 is turned off. In the second frame, the FCV signal is a high voltage and the fourth transistor M4 is turned on. In this frame, all SCAN outputs are low voltage VGL. In the third frame, the four transistors TFT work the same as the first frame, that is, the odd frame outputs SCAN normally, and the even frame, the SCAN signal is a low voltage. Therefore, the duration of one frame of the SCAN signal is twice the duration of one frame of the Gout output, that is, when the GOUT output frequency is 240hz, the SCAN output frequency is 120HZ; the corresponding reference Figure 9 As shown, the duration of one frame of SCAN signal is 4 times of that of one frame of GOUT output, that is, when the Gout output frequency is 240hz, the SCAN output frequency is 60hZ; further, refer to Figure 10 As shown, if the refresh rates of the current frame and the next frame remain unchanged, FCV continues to input the low level VGL, and the fourth transistor M4 remains in the off state.

[0084] like Figure 11 As shown, as the seventh embodiment of the present application, a display device 100 is disclosed, which includes a driving circuit 200, a timing control module 300 and a refresh rate acquisition comparison module 400 as described in any of the above embodiments. The timing control module 300 outputs a clock signal CLK and a frame start signal STV to the gate driving circuit 210 of the driving circuit. The refresh acquisition comparison module 400 is connected to the frequency control circuit 220 of the driving circuit to control the operation of the frequency control circuit 220 to change the gate driving signal output by the gate driving unit 210, control the opening time of the scanning line in each frame, and generate a new gate driving signal corresponding to the refresh rate to the display device for refreshing the display.

[0085] In this embodiment, reference Figure 2 and Figure 11As shown, the timing control module 300 can control the input of the frame start signal, and the refresh rate acquisition comparison module 400 will first obtain the refresh rates of the current frame and the next frame. Taking the refresh rate of the current frame at 240 Hz and the refresh rate of the next frame at 120 Hz as an example, in the first time period of the next frame, the frame start signal of the current frame refresh rate is input to control the thin film transistors on each row of the scan line to open row by row; in the second time period of the next frame, the frequency control circuit is turned on, and a low-level signal is input to the scan lines of all rows to turn off all the thin film transistors corresponding to all the scan lines; if the refresh rates of the two frames before and after do not change, the normal output of the frame start signal of each frame is still controlled normally.

[0086] It should be noted that the limitations on the steps involved in this solution do not limit the order of the steps without affecting the implementation of the specific solution. The steps written in front can be executed first, later, or even simultaneously. As long as this solution can be implemented, it should be deemed to fall within the scope of protection of this application.

[0087] It should be noted that the inventive concept of this application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the various embodiments or technical features are combined, the original technical effects will be enhanced.

[0088] The technical solution of the present application can be widely used in driving circuits of various display panels, such as driving circuits of TN (Twisted Nematic) display panels, driving circuits of IPS (In-Plane Switching) display panels, driving circuits of VA (Vertical Alignment) display panels, and driving circuits of MVA (Multi-Domain Vertical Alignment) display panels. Of course, it can also be driving circuits of other types of display panels, such as driving circuits of OLED (Organic Light-Emitting Diode) display panels, to which the above solution can be applied.

[0089] The above content is a further detailed description of the present application in conjunction with specific optional implementation methods, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, they can make several simple deductions or substitutions without departing from the concept of the present application, which should be considered to fall within the scope of protection of the present application.

Claims

1. A method for driving a display device, characterized in that: Including steps: Get the refresh rate of the current frame and the next frame of the display device; as well as Comparing the refresh rate of the current frame with the refresh rate of the next frame, if the refresh rate of the current frame is greater than the refresh rate of the next frame, activating the first display mode to drive the display device for display; if the refresh rate of the current frame is less than the refresh rate of the next frame, activating the second display mode to drive the display device for display; The first display mode specifically includes the following steps: In the first time period of the next frame, a corresponding scanning signal is generated according to the refresh rate parameter of the current frame to control the thin film transistors on each scan line to turn on row by row, and in the second time period of the next frame, the thin film transistors corresponding to all scan lines are turned off; The specific steps of the second display mode include: During the next frame time, a corresponding scanning signal is generated according to the next frame refresh rate parameter to control the thin film transistors on each scan line to turn on row by row; The length of the first time period is equal to the length of one frame corresponding to the current frame refresh rate, and the length of the second time period is n times the length of the first time period, where n is a positive number.

2. The driving method according to claim 1, wherein: In the first time period of the next frame, a corresponding scanning signal is generated according to the refresh rate parameter of the current frame to control the thin film transistors on each scan line to turn on row by row; In the second time period of the next frame, the step of turning off all thin film transistors corresponding to all scan lines includes: In the first time period of the next frame, a frame start signal of the current frame refresh rate is input to control the thin film transistors on each scan line to turn on row by row; In the second time period of the next frame, the frequency control circuit is turned on to input a low-level signal to the scan lines of all rows to turn off all the thin film transistors corresponding to the scan lines.

3. The driving method according to claim 1, wherein: In the first time period of the next frame, a corresponding scanning signal is generated according to the refresh rate parameter of the current frame to control the thin film transistors on each scan line to turn on row by row; In the second time period of the next frame, the step of turning off all thin film transistors corresponding to all scan lines includes: In the first time period of the next frame, a frame start signal of the current frame refresh rate is input to control the thin film transistors on each scan line to turn on row by row; In the second time period of the next frame, the frame start signal of the current frame refresh rate is turned off, and the scan signals of all scan lines are input to a low level to turn off all thin film transistors corresponding to all scan lines.

4. The driving method according to claim 1, wherein: The first time period is in front, and the second time period is after the first time period and is continuously set. In the first display mode, the sum of the first time period and the second time period of the next frame is equal to one frame time of the current frame.

5. The driving method according to claim 4, wherein: The current frame refresh rate is F1, the next frame refresh rate is F2, the frame duration corresponding to the current frame refresh rate is T1, and the frame duration corresponding to the next frame refresh rate is T2; the first time period is t1, and the second time period is t2; Among them, T1=t1, T2=t1+t2, F1 / F2=t1+t2 / t1.

6. The driving method according to claim 5, wherein: The steps of generating a corresponding scanning signal according to the refresh rate parameter of the current frame in the first time period of the next frame, controlling the thin film transistors on each scan line to turn on row by row, and turning off all the thin film transistors corresponding to all the scan lines in the second time period of the next frame include: Generate a value of a second time period of the next frame according to a ratio of the refresh rates of the current frame and the next frame and a value of the first time period; Wherein, t2 = (F1 / F2-1)*t1.

7. The driving method according to claim 1, wherein: The steps of generating a corresponding scanning signal according to the refresh rate parameter of the current frame in the first time period of the next frame, controlling the thin film transistors on each scan line to turn on row by row, and turning off all the thin film transistors corresponding to all the scan lines in the second time period of the next frame include: During the first time period, a first common level is controlled to be input to the common line corresponding to the display device; during the second time period, a second common level is controlled to be input to the common line corresponding to the display device; The voltage value of the second common level is smaller than the voltage value of the first common level.

8. A driving circuit for a display device, which drives the display device using the driving method according to any one of claims 1 to 7, wherein: The driving circuit includes: a gate drive circuit, generating a gate drive signal to a corresponding scan line of the display device according to a current refresh rate; and a frequency control circuit, arranged between the scan line and the gate drive circuit; The frequency control circuit changes the gate drive signal output by the gate drive circuit to control the on-time of the scan line in each frame, and generates a gate drive signal corresponding to a new refresh rate to the display device for refreshing the display.

9. The driving circuit of the display device according to claim 8, wherein: The gate drive circuit includes a plurality of gate drive units, with each gate drive unit corresponding to a frequency control circuit. The frequency control circuit includes a gate signal input module, a gate signal pull-down module, and a frequency pull-down module. The control end and input end of the gate signal input module are connected to the output end of the gate drive unit corresponding to the previous row of scan lines, and the output end of the gate signal input module is connected to the input end of the scan line. The control end of the gate signal pull-down module is connected to the output end of the gate driving unit corresponding to the current row scan line, the input end is connected to the first level signal input end of the gate driving unit, and the output end is connected to the output end of the gate signal input module; The control end of the frequency pull-down module is connected to the output end of the frequency control voltage, the input end is connected to the first level signal input end of the gate driving unit, and the output end is connected to the output end of the gate signal input module; Wherein, after the current frame scan is completed, during the next frame scan, when the frequency control circuit is a second level signal, the frequency pull-down module controls all gate signals to be low level and input to all the scan lines.

10. A display device, characterized in that: It includes a driving circuit, a timing control module and a refresh rate acquisition and comparison module as described in any one of claims 8 to 9, the timing control module outputs a clock signal and a frame start signal to the gate driving circuit of the driving circuit, and the refresh rate acquisition and comparison module is connected to the frequency control circuit of the driving circuit to control the operation of the frequency control circuit to change the gate driving signal output by the gate driving unit, control the opening time of the scanning line in each frame, and generate a new gate driving signal corresponding to the refresh rate to the display device for refreshing the display.

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