Gate driving circuit, display panel, display device and display driving method

Abstract

A gate drive circuit, a display panel, a display device and a display drive method relate to the field of display technology. The gate drive circuit includes: a first frame start signal line and a cascade circuit; the first frame start signal line is connected to the first input end of the cascade circuit and is configured to: transmit the first frame start signal to the cascade circuit in the first display stage; the cascade circuit includes a plurality of shift registers cascaded to each other, each shift register is connected to a clock signal line, the output end of the shift register is connected to a write module in a pixel drive circuit, and the cascade circuit is configured to: output a first scan signal step by step according to the first frame start signal and a clock signal input by the clock signal line; the effective level of the first frame start signal in one cycle overlaps with a plurality of pulse signals of the clock signal, and the first scan signal includes a plurality of scan pulse signals in one cycle.

Description

Technical Field

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

[0002] Currently, in display devices equipped with organic light-emitting diode (OLED) screens, due to the influence of driving circuits and device structures, the display devices generally have a problem of low brightness in the first frame when switching display images, which seriously affects the user experience. Summary of the invention

[0003] The present disclosure provides a gate driving circuit, comprising: a first frame start signal line and a cascade circuit;

[0004] The first frame start signal line is connected to the first input terminal of the cascade circuit and is configured to: transmit a first frame start signal to the cascade circuit in a first display phase;

[0005] The cascade circuit comprises a plurality of shift registers cascaded to each other, each of the shift registers is connected to a clock signal line, an output end of the shift register is connected to a writing module in a pixel driving circuit, and the cascade circuit is configured to: output a first scanning signal step by step according to the first frame start signal and a clock signal input by the clock signal line;

[0006] Among them, the effective level of the first frame start signal within one cycle overlaps with multiple pulse signals of the clock signal, the first scanning signal includes multiple scanning pulse signals within one cycle, and the writing module is used to write the data signal into the pixel driving circuit under the control of the first scanning signal.

[0007] In some embodiments, the gate drive circuit further includes:

[0008] A second frame start signal line is connected to the second input terminal of the cascade circuit and is configured to: transmit a second frame start signal to the cascade circuit in a second display phase;

[0009] The cascade circuit is further configured to: output a second scanning signal step by step according to the second frame start signal and the clock signal;

[0010] Among them, the number of pulse signals whose effective level of the second frame start signal overlaps with the clock signal in one cycle is less than the number of pulse signals whose effective level of the first frame start signal overlaps with the clock signal in one cycle, and the number of scan pulse signals included in the second scan signal in one cycle is greater than or equal to 1, and less than the number of scan pulse signals included in the first scan signal in one cycle.

[0011] In some implementations, the first frame start signal line and the second frame start signal line are independently configured, or share the same signal line.

[0012] In some implementations, the number of pulse signals whose effective level of the first frame start signal overlaps with the clock signal within one cycle is greater than or equal to 2 and less than or equal to 5.

[0013] In some implementations, an effective level of the second frame start signal in one period overlaps with a pulse signal of the clock signal.

[0014] In some implementations, the effective level of the first frame start signal is a low level.

[0015] In some embodiments, the second frame start signal has the same active level voltage as the first frame start signal.

[0016] In some embodiments, in the cascade circuit, the signal input end of the first-stage shift register is connected to the first input end and the second input end, the output end of the E-stage shift register is connected to the signal input end of the E+F-stage shift register, and the output end of the M-stage shift register is connected to the reset signal input end of the MN-stage shift register, wherein 1≤E<H, F≥1, E+F≤H, 1<M≤H, 1≤N<M, and E, F, H, M and N are all positive integers, and H is the total number of shift registers in the cascade circuit.

[0017] The present disclosure provides a display panel, comprising:

[0018] A plurality of pixel driving circuits arranged in an array;

[0019] A plurality of light emitting devices, wherein the light emitting devices are connected to a pixel driving circuit located in the same pixel;

[0020] A plurality of scanning signal lines, wherein the scanning signal lines are connected to scanning signal terminals of pixel driving circuits located in the same row;

[0021] a plurality of data signal lines, wherein the data signal lines are connected to data signal terminals of pixel driving circuits located in the same column; and

[0022] As in any one of the embodiments of the gate driving circuit, output ends of the plurality of shift registers in the cascade circuit are respectively connected to different scanning signal lines;

[0023] The pixel driving circuit is configured to: write the data signal at the data signal end into the pixel driving circuit according to the signal at the scanning signal end, so as to drive the light emitting device to emit light.

[0024] In some embodiments, the plurality of data signal lines include a first data signal line and a second data signal line, and the display panel further includes: a signal terminal, a first data selection circuit and a second data selection circuit, the first data signal line is connected to the signal terminal through the first data selection circuit, and the second data signal line is connected to the signal terminal through the second data selection circuit.

[0025] In some embodiments, the pixel driving circuit includes:

[0026] a writing module connected to the data signal terminal, the first node and the scanning signal terminal, and configured to: in a compensation phase, write the data signal into the first node in response to a signal at the scanning signal terminal;

[0027] A driving module connected to the first node, the second node and the third node, and configured to: write the signal of the first node into the second node under the potential control of the third node;

[0028] A compensation module, connected to the second node, the third node and the scan signal terminal, and configured to: in a compensation phase, write the signal of the second node into the third node according to the signal of the scan signal terminal;

[0029] A light-emitting control module is connected to the first voltage terminal, the enable signal terminal, the first node, the second node and the light-emitting device, and is configured to: in a light-emitting stage, cooperate with the driving module according to the enable signal of the enable signal terminal to drive the light-emitting device to emit light;

[0030] a storage module, connected to the first voltage terminal and the third node, and configured to store a signal of the third node;

[0031] A first reset module is connected to the third node, the first reset signal terminal and the reset control signal terminal, and is configured to: write the signal of the first reset signal terminal into the third node according to the signal of the reset control signal terminal; and

[0032] The second reset module is connected to the anode of the light emitting device, the second reset signal terminal and the scan signal terminal, and is configured to write the signal of the second reset signal terminal into the anode of the light emitting device according to the signal of the scan signal terminal.

[0033] In some embodiments, in the display device displaying multiple consecutive frames of the same picture, the ratio of the brightness of the first frame to the preset frame is the first frame brightness ratio, the first frame brightness ratio is greater than or equal to 85%, and the preset frame is any frame after the same picture is stably displayed.

[0034] The present disclosure provides a display device, comprising:

[0035] The display panel as described in any one of the embodiments; and

[0036] The display driver chip is connected to the display panel and is used to provide a driving signal to the display panel. The driving signal includes: the first frame start signal, the clock signal and the data signal.

[0037] The present disclosure provides a display driving method, which is applied to a display panel as described in any embodiment, and the display driving method includes:

[0038] providing a clock signal to the clock signal line so that the clock signal line transmits the clock signal to the shift register;

[0039] In the first display stage, a first frame start signal is provided to the first frame start signal line so that the first frame start signal line transmits the first frame start signal to the cascade circuit, and the cascade circuit outputs a first scanning signal step by step according to the first frame start signal and the clock signal.

[0040] In some embodiments, when the gate driving circuit further includes a second frame start signal line, and the second frame start signal line is connected to the second input terminal of the cascade circuit, after the step of providing a clock signal to the clock signal line, the method further includes:

[0041] In the second display stage, a second frame start signal is provided to the second frame start signal line so that the second frame start signal line transmits the second frame start signal to the cascade circuit, and the cascade circuit outputs a second scanning signal step by step according to the second frame start signal and the clock signal.

[0042] In some implementations, before the steps of providing a first frame start signal to the first frame start signal line and providing a second frame start signal to the second frame start signal line, the method further includes:

[0043] Acquire display data, wherein the display data includes a previous frame of display data and a next frame of display data, wherein the previous frame of display data and the next frame of display data are display data of two adjacent frames;

[0044] The previous frame display data is compared with the next frame display data, and according to the comparison result, the steps in the first display stage or the steps in the second display stage are executed.

[0045] In some implementations, executing the steps in the first display stage or the steps in the second display stage according to the comparison result includes:

[0046] If the previous frame display data is different from the next frame display data, executing the steps in the first display stage;

[0047] If the previous frame display data is the same as the next frame display data, the steps in the second display stage are performed.

[0048] In some embodiments, the first scan signal includes a plurality of scan pulse signals, the plurality of scan signal lines include a first scan signal line, the plurality of data signal lines include a first data signal line, and the pixel driving circuit connected to the first scan signal line and the first data signal line is a first pixel driving circuit. After the step of providing the first frame start signal to the first frame start signal line so that the first frame start signal line transmits the first frame start signal to the cascade circuit, and the cascade circuit outputs the first scan signal step by step according to the first frame start signal and the clock signal, the step further includes:

[0049] A plurality of compensation stages are separated from each other, each of which comprises: inputting the scanning pulse signal to the scanning signal end of the first pixel driving circuit, providing a data signal to the data signal end of the first pixel driving circuit, so that the data signal is written into the first pixel driving circuit.

[0050] In some embodiments, the plurality of data signal lines further include a second data signal line, the display panel further includes a signal terminal, a first data selection circuit, and a second data selection circuit, and the first data signal line is connected to the signal terminal through the first data selection circuit, and the second data signal line is connected to the signal terminal through the second data selection circuit, and before each of the compensation stages, the process further includes:

[0051] The data signal is provided to the signal terminal, the first data selection circuit is controlled to be turned on, and the second data selection circuit is controlled to be turned off, so that the data signal is written into a first data storage capacitor, and one plate of the first data storage capacitor is connected to the first data signal line.

[0052] In some embodiments, when the first pixel driving circuit includes a writing module, a driving module, a compensation module, a light emitting control module and a first reset module, and the writing module is connected to the data signal terminal, the first node and the scanning signal terminal, the driving module is connected to the first node, the second node and the third node, the compensation module is connected to the second node, the third node and the scanning signal terminal, the light emitting control module is connected to the first voltage terminal, the enable signal terminal, the first node, the second node and the light emitting device, and the first reset module is connected to the third node, the first reset signal terminal and the reset control signal terminal, the compensation stage is used to write the data signal to the first node, the second node and the third node in sequence, and before each of the compensation stages, it also includes:

[0053] In a reset stage, a first reset signal is provided to the first reset signal terminal, and a reset control signal is provided to the reset control signal terminal, so that the first reset signal is written into the third node;

[0054] After the multiple compensation stages, the method further includes:

[0055] In the light-emitting stage, an enable signal is provided to the enable signal terminal so that the light-emitting control module cooperates with the drive module to drive the light-emitting device to emit light.

[0056] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the proportions in the drawings are only for illustration and do not represent the actual proportions.

[0058] Figure 1 A schematic diagram of the structure of a gate driving circuit provided by the present disclosure is shown;

[0059] Figure 2a A driving signal timing diagram of a gate driving circuit is shown;

[0060] Figure 2bA schematic diagram of a circuit structure of a shift register is shown;

[0061] Figure 3 shows a brightness-time curve of the first display panel;

[0062] Figure 4 shows a brightness-time curve of a second display panel;

[0063] Figure 5 A schematic structural diagram of a display panel provided by the present disclosure is shown;

[0064] Figure 6 A "virtual edge" defect of a display panel is shown;

[0065] Figure 7 A driving signal timing diagram of a display panel is shown;

[0066] Figure 8 A schematic structural diagram of a pixel driving circuit provided by the present disclosure is shown;

[0067] Fig. 9 A schematic structural diagram of a display device provided by the present disclosure is shown;

[0068] Fig.10 A first driving signal timing diagram of a pixel driving circuit is shown;

[0069] Fig.11 A second driving signal timing diagram of a pixel driving circuit is shown. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0071] In actual use, OLED displays are often in a state of looping video playback. Due to the influence of the driving circuit and device structure, when the display switches the display screen, the brightness of the first frame is usually only 60% of the required brightness. For the more sensitive human eye, the phenomenon seen is that there will be a ghosting in the first frame after the screen is switched. The first frame response or first frame brightness ratio (FFR) is usually used to characterize this phenomenon. The higher the FFR value, the less obvious the ghosting.

[0072] The present disclosure provides a gate driving circuit, such as Figure 1 and Figure 2a As shown, the gate drive circuit includes: a first frame start signal line 11 and a cascade circuit 12. The first frame start signal line 11 is connected to the first input terminal Input1 of the cascade circuit 12, and the first frame start signal line 11 is configured to: transmit the first frame start signal GSTV1 to the cascade circuit 12 in the first display stage. The cascade circuit 12 includes a plurality of shift registers 13 cascaded to each other, each shift register 13 is connected to a clock signal line 14, and the cascade circuit 12 is configured to: output the first scanning signal G1 step by step according to the first frame start signal GSTV1 and the clock signal GCK input by the clock signal line 14.

[0073] like Figure 2a As shown, the effective level of the first frame start signal GSTV1 in one cycle overlaps with a plurality of pulse signals of the clock signal GCK, and the first scan signal G1 includes a plurality of scan pulse signals in one cycle.

[0074] In this disclosure, "a cycle" refers to a frame cycle (e.g. Figure 2a 1Frame), that is, when the display panel displays multiple frames, the display period of each frame is the inverse of the refresh frequency of the display panel.

[0075] Reference Figure 5 and Figure 8 The output terminal Output of the shift register 13 and the writing module 81 in the pixel driving circuit 51 can be connected through the scanning signal line gate, and the scanning signal line gate is connected to the scanning signal terminal Vgate of the writing module 81. The writing module 81 is used to write the data signal into the pixel driving circuit 51 under the control of the first scanning signal G1.

[0076] For example, in Figure 2a In the embodiment, the effective level of the first frame start signal GSTV1 in one cycle overlaps with three pulse signals of the clock signal GCK.

[0077] In some embodiments, the number of pulse signals of which the effective level of the first frame start signal GSTV1 overlaps with the clock signal GCK in one cycle is greater than or equal to 2 and less than or equal to 5. Figure 2a As shown, the number of pulse signals of which the effective level of the first frame start signal GSTV1 overlaps with the clock signal GCK in one cycle is 3.

[0078] In some embodiments, Figure 2a As shown, the effective level of the first frame start signal GSTV1 is a low level.

[0079] For example, in the cascade circuit 12, the input terminal Input of the first stage shift register GOA1 is connected to the first input terminal Input1 of the cascade circuit 12, or is multiplexed as the first input terminal Input1 of the cascade circuit 12 (eg Figure 1 shown).

[0080] In some embodiments, in the cascade circuit 12, the output terminal Output of the E-th stage shift register 13 is connected to the input terminal Input of the E+F-th stage shift register 13, and the output terminal Output of the M-th stage shift register 13 is connected to the reset terminal Rst of the MN-th stage shift register 13, wherein 1≤E<H, F≥1, E+F≤H, 1<M≤H, 1≤N<M, and E, F, H, M and N are all positive integers, and H is the total number of shift registers 13 in the cascade circuit 12.

[0081] For example, Figure 1 As shown, F = N = 1. Figure 1 In the embodiment, for each stage of the shift register 13, the first scanning signal G1 outputted by the shift register 13 can be outputted to the scanning signal line gate, and can also be used as the start signal of the next stage of the shift register 13 and the reset signal of the previous stage of the shift register 13. In the first display stage, the start signal of the first stage of the shift register GOA1 is the first frame start signal GSTV1, the first stage of the shift register GOA1 may not output the reset signal, and the last stage of the shift register 13 may be connected to a row of redundant shift registers 13 to realize the reset of the last stage of the shift register 13.

[0082] For example, Figure 2b As shown, the shift register 13 may include a charging module 21, an output module 22, a storage capacitor C and a reset module 23. The charging module 21 is respectively connected to the input terminal Input and the pull-up node PU of the shift register 13, and is used to write the signal of the input terminal Input into the pull-up node PU according to the signal of the input terminal Input; the output module 22 is respectively connected to the clock signal input terminal GCK, the pull-up node PU and the output terminal Output, and is used to write the clock signal of the clock signal input terminal GCK into the output terminal Output according to the potential of the pull-up node PU; the storage capacitor C is connected between the pull-up node PU and the output terminal Output, and is used to store the voltage of the pull-up node PU; the reset module 23 is respectively connected to the reset terminal Rst, the reset signal terminal VSS, the pull-up node PU and the output terminal Output, and is used to write the signal of the reset signal terminal VSS into the pull-up node PU and the output terminal Output according to the signal of the reset terminal Rst.

[0083] like Figure 2bAs shown, the charging module 21 includes a transistor M1, the control electrode and the first electrode of the transistor M1 are connected to the input terminal Input of the shift register 13, and the second electrode of the transistor M1 is connected to the pull-up node PU. The output module 22 includes a transistor M3, the control electrode of the transistor M3 is connected to the pull-up node PU, the first electrode of the transistor M3 is connected to the clock signal input terminal GCK, and the second electrode of the transistor M3 is connected to the output terminal Output of the shift register 13. The reset module 23 includes a transistor M2 and a transistor M4, the control electrode of the transistor M2 is connected to the pull-down node PD, the first electrode of the transistor M2 is connected to the reset signal terminal VSS, the second electrode of the transistor M2 is connected to the pull-up node PU, the control electrode of the transistor M4 is connected to the pull-down node PD, the first electrode of the transistor M4 is connected to the reset signal terminal VSS, and the second electrode of the transistor M4 is connected to the output terminal Output. Figure 2b In the embodiment, transistors M1 to M4 are all P-type transistors.

[0084] like Figure 2a As shown, in the first display stage, the first frame start signal line 11 provides the first frame start signal GSTV1 to the input end of the first stage shift register GOA1. Figure 2b As shown, when the input terminal Input of the first-stage shift register GOA1 is connected to the low-level first frame start signal GSTV1, the transistor M1 is turned on, the potential of the pull-up node PU is low, and the transistor M3 is also in the on state, so that the signal of the clock signal input terminal GCK is written into the output terminal Output, and then the first scanning signal is output. Figure 2a As shown, due to the effective level stage of the first frame start signal GSTV1 in one cycle (such as Figure 2a The low level phase shown in the figure) overlaps with three pulse signals of the clock signal GCK, so the first scanning signal output by the output terminal Output includes three scanning pulse signals in one cycle.

[0085] In this way, the cascade circuit 12 generates the multi-pulse first scanning signal G1 step by step under the action of the first frame start signal GSTV1 and the clock signal GCK. In the cascade circuit 12, the working process of the shift registers 13 of each stage after the first stage shift register GOA1 is similar to that of the first stage shift register GOA1, and will not be repeated here. It can be understood that the number of pulse signals whose effective level of the first frame start signal GSTV1 overlaps with the clock signal GCK in one cycle is the same as the number of scanning pulse signals included in the first scanning signal G1 in one cycle.

[0086] When the gate driving circuit 10 provided by the present disclosure is applied to a display panel, Figure 5 The display panel may include: a pixel driving circuit 51, a light emitting device 52 (such as Figure 8As shown), a scanning signal line gate and a data signal line data, an output terminal Output of a shift register 13 is connected to a scanning signal line gate, and a signal output by the output terminal Output is transmitted to the pixel driving circuit 51 through the scanning signal line gate, and then the pixel driving circuit 51 writes the data signal input by the data signal line data into the pixel driving circuit 51 according to the signal of the scanning signal line gate (as shown). Figure 8 The gate of the driving transistor T3 shown, ie, the third node N3), drives the light emitting device 52 to emit light.

[0087] Since the first scanning signal G1 has multiple scanning pulse signals within one cycle, when the gate driving circuit 10 provided by the present disclosure is applied to a display panel, the pixel driving circuit 51, under the control of the first scanning signal G1, can perform multiple voltage biases on the gate of the driving transistor T3 before the light-emitting device 52 emits light, thereby compensating the threshold voltage of the driving transistor T3 multiple times, so that the threshold voltage of the driving transistor T3 is shifted toward the negative direction, thereby reducing the difference between the threshold voltages in the compensation stage and the light-emitting stage, thereby improving the brightness of the display screen.

[0088] The inventor tested the change of brightness of two display panels displaying the same picture for multiple frames over time. The first display panel adopts the gate drive circuit provided by the present disclosure. The test results are as follows: Figure 3 As shown, the second display panel adopts the gate driving circuit in the related art (the output scanning signal includes a scanning pulse signal in one cycle), and the test results are as follows Figure 4 In the display panel showing the same picture in a continuous multi-frame picture, the brightness ratio of the first frame picture to the preset frame picture is the FFR value. The preset frame picture can be any frame picture after the above same picture is stably displayed. Here, the fourth frame picture is taken as the preset frame picture. Figure 3 and Figure 4 It can be found that the first frame start brightness and end brightness of the first display panel are greatly improved, and the fourth frame brightness of the two display panels is basically the same. Therefore, the gate drive circuit 10 provided by the present disclosure can significantly improve the FFR value of the display panel and improve the ghosting problem of the first frame displayed after switching the screen.

[0089] It should be noted that the first display stage may include the first frame display stage after the switching screen, and may also include any frame display stage after the switching screen is stably displayed, such as Figure 3 As shown, the first display stage includes the first frame to the fifth frame display stage after the screen is switched.

[0090] In some embodiments, the first display stage may be the entire display stage of the display panel, that is, each frame display in the entire display stage uses the first frame start signal GSTV1 as the start signal of the cascade circuit 12 .

[0091] The inventors have found that when the first frame start signal GSTV1 is used as the start signal of the cascade circuit 12 during the entire display process, a "virtual edge" defect will be generated at the edge of the display screen, such as Figure 6 The inventor analyzed the defect and found Figure 5 In the display panel shown, a plurality of pixel driving circuits 51 are arranged in rows and columns. Assuming that the (n+5th) row is the last row of pixel driving circuits 51, the gate driving circuit 10 adopts the Figure 2a The first frame start signal GSTV1 is shown as driven, referring to Figure 7 Shows Figure 5 As shown in the driving signal timing diagram of the display panel, when the pixel driving circuits 51 of the (n+1)th row and the previous row are writing data signals, the data signal line data will write signals to the pixel driving circuits 51 of 3 rows at the same time; and when the pixel driving circuits 51 of the (n+2)th row to the (n+5)th row are writing data signals, the data signal line data will write signals to 2 or 1 row of pixel driving circuits 51 at the same time. This results in a larger voltage at the third node N3 (i.e., the gate of the driving transistor T3) in the pixel driving circuits 51 of the (n+2)th row to the (n+5)th row near the edge, resulting in a darkening phenomenon in a bright screen, and then Figure 6 The dark "virtual edge" phenomenon near the middle border.

[0092] In order to avoid this abnormal display phenomenon, in some embodiments, such as Figure 1 As shown, the gate drive circuit also includes: a second frame start signal line 15, the second frame start signal line 15 is connected to the second input terminal Input2 of the cascade circuit 12, and the second frame start signal line 15 is configured to: transmit the second frame start signal GSTV2 to the cascade circuit 12 in the second display stage. Correspondingly, the cascade circuit 12 is also configured to: output the second scan signal G2 step by step according to the second frame start signal GSTV2 and the clock signal GCK. Among them, the number of pulse signals whose effective level of the second frame start signal GSTV2 overlaps with the clock signal GCK in one cycle is less than the number of pulse signals whose effective level of the first frame start signal GSTV1 overlaps with the clock signal GCK in one cycle, and the number of scan pulse signals included in the second scan signal G2 in one cycle is greater than or equal to 1, and is less than the number of scan pulse signals included in the first scan signal G1 in one cycle.

[0093] For example, in Figure 2aIn the embodiment, the effective level of the second frame start signal GSTV2 in one cycle overlaps with one pulse signal of the clock signal GCK. That is, the number of pulse signals of the second frame start signal GSTV2 overlapping with the effective level of the clock signal GCK in one cycle is one.

[0094] For example, in the cascade circuit 12, the input terminal Input of the first stage shift register GOA1 is connected to the second input terminal Input2 of the cascade circuit 12, or is multiplexed as the second input terminal Input2 of the cascade circuit 12 (eg Figure 1 shown).

[0095] In the second display stage, the start signal of the first-stage shift register GOA1 is the second frame start signal GSTV2. Thus, in the second display stage, the cascade circuit 12 generates the second scan signal G2 step by step under the action of the second frame start signal GSTV2 and the clock signal GCK. It can be understood that the number of pulse signals whose effective level of the second frame start signal GSTV2 overlaps with the clock signal GCK in one cycle is the same as the number of scan pulse signals included in the second scan signal G2 in one cycle. When the number of pulse signals whose effective level of the second frame start signal GSTV2 overlaps with the clock signal GCK in one cycle is 1, under the triggering of the second frame start signal GSTV2, the cascade circuit 12 outputs the second scan signal G2 having one scan pulse signal in one cycle.

[0096] In some embodiments, the second frame start signal GSTV2 has the same voltage as the active level of the first frame start signal GSTV1.

[0097] In some embodiments, the first display stage may be the first frame display stage after the screen is switched, and the second display stage may be any frame display stage after the switched screen is stably displayed, such as the second frame display stage, the third frame display stage, etc.

[0098] Reference Fig. 9 A schematic diagram of the structure of a display device is shown. Fig. 9 As shown, the display device includes a display driver integrated circuit (DDIC) and a display panel (Panel), and the DDIC is connected to the application processor (AP) via a mobile industry processor interface (MIPI). Figure 5When the display panel shown in the figure is used, the DDIC can start the judgment mechanism according to the display data sent by the AP end. For example, the display data of two adjacent frames, such as the display data of the previous frame and the display data of the next frame, can be compared. If the display data of the previous frame is different from the display data of the next frame (such as Figure 2a As shown, the previous frame display data is data a, and the next frame display data is data b), that is, the next frame display data is updated, and the first frame display corresponding to the switching screen is performed. In this case, the steps in the first display stage are performed, and the first frame start signal GSTV1 is used as the start signal of the first-stage shift register GOA1, and the second frame start signal GSTV2 in the second frame start signal line 15 will automatically Hiz off (that is, in a high-impedance state). If the previous frame display data is the same as the next frame display data, that is, the next frame display data is not updated, and the same screen as the previous frame display data is displayed, in this case, the steps in the second display stage can be performed, and the second frame start signal GSTV2 is used as the start signal of the first-stage shift register GOA1, and the first frame start signal GSTV1 in the first frame start signal line 11 will automatically Hiz off (that is, in a high-impedance state).

[0099] In this way, by driving the cascade circuit 12 differently in stages, the "virtual edge" problem can be solved, and the display brightness of the first frame of the switching screen can be improved, the FFR value can be improved, and the ghosting problem can be solved.

[0100] In some implementations, the first frame start signal line 11 and the second frame start signal line 15 are independently configured. Figure 1 Of course, the first frame start signal line 11 and the second frame start signal line 15 may also share the same signal line, which is not limited in the present disclosure.

[0101] The present disclosure provides a display panel such as Figure 5 and Figure 8 As shown, the display panel includes: a plurality of pixel driving circuits 51 arranged in an array; a plurality of light-emitting devices 52, the light-emitting devices 52 being connected to the pixel driving circuit 51 located in the same pixel; a plurality of scanning signal lines gate, the scanning signal lines gate being connected to the scanning signal terminals Vgate of the pixel driving circuits 51 located in the same row; a plurality of data signal lines data, the data signal lines data being connected to the data signal terminals Vdata of the pixel driving circuits 51 located in the same column; and a gate driving circuit 10 as provided in any embodiment, the output terminals Output of the plurality of shift registers 13 in the cascade circuit 12 being respectively connected to different scanning signal lines gate.

[0102] The pixel driving circuit 51 is configured to write the data signal of the data signal terminal Vdata into the pixel driving circuit 51 according to the signal of the scanning signal terminal Vgate, so as to drive the light emitting device 52 to emit light.

[0103] It can be understood that the display panel provided by the present disclosure has the advantages of the above-mentioned gate driving circuit 10, which will not be described in detail here.

[0104] In some embodiments, Figure 5 As shown, the multiple data signal lines data include a first data signal line data1 and a second data signal line data2, and the display panel also includes: a signal terminal Source, a first data selection circuit Mux1 and a second data selection circuit Mux2, the first data signal line data1 is connected to the signal terminal Source through the first data selection circuit Mux1, and the second data signal line data2 is connected to the signal terminal Source through the second data selection circuit Mux2.

[0105] For example, Figure 5 As shown, the first data selection circuit Mux1 is a switch transistor, which is turned on or off under the control signal Mux1, and the second data selection circuit Mux2 is a switch transistor, which is turned on or off under the control signal Mux2. Figure 5 In the embodiment, the switch transistor in the first data selection circuit Mux1 and the switch transistor in the second data selection circuit Mux2 are both P-type transistors.

[0106] In specific implementation, Figure 7 As shown, before each scanning pulse signal in the first scanning signal G1 and the second scanning signal G2, the first data selection circuit Mux1 can be controlled to be turned on (eg Figure 7 The low level of Mux1 in the middle), controls the second data selection circuit Mux2 to be closed (such as Figure 7 The data signal inputted by the signal terminal Source is written into the first data storage capacitor Cdata1 through the first data selection circuit Mux1 and the first data signal line data1, and one plate of the first data storage capacitor Cdata1 is connected to the first data signal line data1, and then the second data selection circuit Mux2 is controlled to be turned on (such as Figure 7 The low level of Mux2 in the first data selection circuit controls the first data selection circuit Mux1 to be closed (such as Figure 7The high level of Mux1 in the signal terminal Source is used to write the data signal inputted by the signal terminal Source into the second data storage capacitor Cdata2 through the second data selection circuit Mux2 and the second data signal line data2, and one plate of the second data storage capacitor Cdata2 is connected to the second data signal line data2.

[0107] It should be noted that in Figure 5 It is shown that two data signal lines data share the same signal terminal Source. In a specific implementation, three or more data signal lines data may share the same signal terminal Source, and the present disclosure does not limit this.

[0108] In some embodiments, Figure 8 As shown, the pixel driving circuit 51 includes: a writing module 81, the writing module 81 is connected to the data signal terminal Vdata, the first node N1 and the scanning signal terminal Vgate, and the writing module 81 is configured to: in the compensation stage, write the data signal to the first node N1 according to the signal of the scanning signal terminal Vgate.

[0109] For example, Figure 8 As shown, the writing module 81 may include a fourth transistor T4, a control electrode of which is connected to the scan signal terminal Vgate, a first electrode of which is connected to the data signal terminal Vdata, and a second electrode of which is connected to the first node N1.

[0110] In some embodiments, the pixel driving circuit 51 includes: a driving module 82, the driving module 82 is connected to the first node N1, the second node N2 and the third node N3, and the driving module 82 is configured to: write the signal of the first node N1 to the second node N2 under the potential control of the third node N3.

[0111] For example, Figure 8 As shown, the driving module 82 may include a driving transistor T3, a control electrode connected to the third node N3, a first electrode connected to the first node N1, and a second electrode connected to the second node N2.

[0112] In some embodiments, the pixel driving circuit 51 includes: a compensation module 83, the compensation module 83 is connected to the second node N2, the third node N3 and the scanning signal terminal Vgate, and the compensation module 83 is configured to: in the compensation stage, write the signal of the second node N2 into the third node N3 according to the signal of the scanning signal terminal Vgate.

[0113] For example, Figure 8 As shown, the compensation module 83 may include a second transistor T2, a control electrode of which is connected to the scan signal terminal Vgate, a first electrode of which is connected to the second node N2, and a second electrode of which is connected to the third node N3.

[0114] In some embodiments, the pixel driving circuit 51 includes: a light-emitting control module 84, the light-emitting control module 84 is connected to the first voltage terminal ELVDD, the enable signal terminal EM, the first node N1, the second node N2 and the light-emitting device 52, and the light-emitting control module 84 is configured to: in the light-emitting stage, cooperate with the driving module 82 according to the enable signal of the enable signal terminal EM to drive the light-emitting device 52 to emit light.

[0115] For example, Figure 8 As shown, the light-emitting control module 84 may include a fifth transistor T5 and a sixth transistor T6, the control electrode of the fifth transistor T5 is connected to the enable signal terminal EM, the first electrode of the fifth transistor T5 is connected to the first voltage terminal ELVDD, the second electrode of the fifth transistor T5 is connected to the first node N1, the control electrode of the sixth transistor T6 is connected to the enable signal terminal EM, the first electrode of the sixth transistor T6 is connected to the second node N2, and the second electrode of the sixth transistor T6 is connected to the anode of the light-emitting device 52.

[0116] In some embodiments, the pixel driving circuit 51 includes a storage module 85 , the storage module 85 is connected to the first voltage terminal ELVDD and the third node N3 , and the storage module 85 is configured to store a signal of the third node N3 .

[0117] For example, Figure 8 As shown, the storage module 85 includes a first capacitor Cst, a first electrode of which is connected to the first voltage terminal ELVDD, and a second electrode of which is connected to a third node N3.

[0118] In some embodiments, the pixel driving circuit 51 includes: a first reset module 86, the first reset module 86 is connected to the third node N3, the first reset signal terminal Vint1 and the reset control signal terminal Reset, and the first reset module 86 is configured to: write the signal of the first reset signal terminal Vint1 into the third node N3 according to the signal of the reset control signal terminal Reset.

[0119] For example, Figure 8 As shown, the first reset module 86 includes a first transistor T1, a control electrode connected to the reset control signal terminal Reset, a first electrode connected to the first reset signal terminal Vint1, and a second electrode connected to the third node N3.

[0120] In some embodiments, the pixel driving circuit 51 includes: a second reset module 87, the second reset module 87 is connected to the anode of the light-emitting device 52, the second reset signal terminal Vint2 and the scanning signal terminal Vgate, and the second reset module 87 is configured to: write the signal of the second reset signal terminal Vint2 into the anode of the light-emitting device 52 according to the signal of the scanning signal terminal Vgate.

[0121] For example, Figure 8 As shown, the second reset module 87 includes a seventh transistor T7 , a control electrode of which is connected to the scan signal terminal Vgate, a first electrode of which is connected to the second reset signal terminal Vint2 , and a second electrode of which is connected to the anode of the light emitting device 52 .

[0122] For example, in Figure 8 In the embodiment, the first transistor T1 to the seventh transistor T7 are all P-type transistors. Of course, the first transistor T1 to the seventh transistor T7 can also be N-type transistors, which is not limited in the present disclosure.

[0123] In order to ensure that the human eye cannot detect the ghosting phenomenon of the first frame of the switching screen, in some embodiments, in the display panel displaying multiple consecutive frames of the same screen, the brightness ratio of the first frame to the preset frame is the first frame brightness ratio FFR, the first frame brightness ratio is greater than or equal to 85%, and the preset frame is any frame after the same screen is stably displayed.

[0124] The present disclosure provides a display device, such as Fig. 9 As shown, it includes: a display panel Panel provided in any embodiment; and a display driver chip DDIC. The display driver chip DDIC is connected to the display panel Panel and is used to provide a driving signal to the display panel Panel. The driving signal includes: a first frame start signal, a clock signal, and a data signal.

[0125] It can be understood that the display device provided by the present disclosure has the advantages of the above-mentioned gate driving circuit 10, which will not be described in detail here.

[0126] The display device provided by the present disclosure may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame or a navigator.

[0127] like Fig. 9 As shown, DDIC is connected to the application processor AP via the mobile industry processor interface MIPI.

[0128] In some implementations, the driving signal may further include a second frame start signal and the like.

[0129] The present disclosure provides a display driving method, which is applied to a display panel (such as Figure 5 As shown), the display driving method includes:

[0130] Step S01 : providing a clock signal GCK to the clock signal line 14 , so that the clock signal line 14 transmits the clock signal GCK to the shift register 13 .

[0131] Step S02: In the first display stage, a first frame start signal GSTV1 is provided to the first frame start signal line 11, so that the first frame start signal line 11 transmits the first frame start signal GSTV1 to the cascade circuit 12, and the cascade circuit 12 outputs the first scanning signal G1 step by step according to the first frame start signal GSTV1 and the clock signal GCK.

[0132] The display driving method provided by the present disclosure can be executed by a display driving chip DDIC in a display device.

[0133] In some embodiments, Figure 5 As shown, when the gate driving circuit further includes a second frame start signal line 15, and the second frame start signal line 15 is connected to the second input terminal Input2 of the cascade circuit 12, after step S01, it further includes:

[0134] Step S11: In the second display stage, a second frame start signal GSTV2 is provided to the second frame start signal line 15, so that the second frame start signal line 15 transmits the second frame start signal GSTV2 to the cascade circuit 12, and the cascade circuit 12 outputs the second scanning signal G2 step by step according to the second frame start signal GSTV2 and the clock signal GCK.

[0135] In some implementations, before step S02 and step S11, the method further includes:

[0136] Step S21: acquiring display data, the display data including a previous frame of display data and a next frame of display data, the previous frame of display data and the next frame of display data being display data of two adjacent frames.

[0137] Step S22: Compare the previous frame display data with the next frame display data, and execute the steps in the first display stage or the steps in the second display stage according to the comparison result.

[0138] In some embodiments, in step S22, according to the comparison result, the steps in the first display stage or the steps in the second display stage are performed, including:

[0139] Step S31: If the previous frame display data is different from the next frame display data, then the steps in the first display stage are executed.

[0140] Step S32: If the previous frame display data is the same as the next frame display data, then execute the steps in the second display stage.

[0141] In some embodiments, Fig.10As shown, the first scanning signal G1 includes a plurality of scanning pulse signals, the plurality of scanning signal lines gate include a first scanning signal G1 line, the plurality of data signal lines data include a first data signal line data1, and the pixel driving circuit 51 connected to the first scanning signal G1 line and the first data signal line data1 is the first pixel driving circuit 51. After step S02, the following further includes:

[0142] Step S41: multiple compensation stages separated from each other, each compensation stage includes: inputting a scan pulse signal to the scan signal terminal Vgate of the first pixel driving circuit 51, and providing a data signal to the data signal terminal Vdata of the first pixel driving circuit 51, so that the data signal is written into the first pixel driving circuit 51.

[0143] In each compensation stage, a voltage bias can be performed on the gate of the driving transistor T3. Multiple compensation stages can compensate the threshold voltage of the driving transistor T3 multiple times, so that the threshold voltage of the driving transistor T3 shifts toward the negative direction.

[0144] In some embodiments, Fig.11 As shown, the second scanning signal G2 includes a scanning pulse signal, multiple scanning signal lines gate include a first scanning signal G1 line, multiple data signal lines data include a first data signal line data1, and the pixel driving circuit 51 connected to the first scanning signal G1 line and the first data signal line data1 is the first pixel driving circuit 51. After step S11, it also includes: a compensation stage, inputting a scanning pulse signal to the scanning signal terminal Vgate of the first pixel driving circuit 51, and providing a data signal to the data signal terminal Vdata of the first pixel driving circuit 51, so that the data signal is written into the first pixel driving circuit 51.

[0145] In some embodiments, Figure 5 As shown, the plurality of data signal lines data further include a second data signal line data2, the display panel further includes a signal terminal Source, a first data selection circuit Mux1 and a second data selection circuit Mux2, and the first data signal line data1 is connected to the signal terminal Source through the first data selection circuit Mux1, and the second data signal line data2 is connected to the signal terminal Source through the second data selection circuit Mux2, as shown in FIG. Figure 7 As shown, in step S41, before each compensation stage, it also includes:

[0146] Step S51: providing a data signal to the signal terminal Source, controlling the first data selection circuit Mux1 to open, and controlling the second data selection circuit Mux2 to close, so that the data signal is written into the first data storage capacitor Cdata1, and one plate of the first data storage capacitor Cdata1 is connected to the first data signal line data1.

[0147] In specific implementation, Fig.10 Figure 7 As shown, in step S41, before each compensation stage, it can also include: providing a data signal to the signal terminal Source, controlling the second data selection circuit Mux2 to open, and controlling the first data selection circuit Mux1 to close, so that the data signal is written into the second data storage capacitor Cdata2, and one plate of the second data storage capacitor Cdata2 is connected to the second data signal line data2.

[0148] In some embodiments, Figure 8 As shown, when the first pixel driving circuit 51 includes a writing module 81, a driving module 82, a compensation module 83, a light emitting control module 84 and a first reset module 86, and the writing module 81 is connected to the data signal terminal Vdata, the first node N1 and the scanning signal terminal Vgate, the driving module 82 is connected to the first node N1, the second node N2 and the third node N3, the compensation module 83 is connected to the second node N2, the third node N3 and the scanning signal terminal Vgate, the light emitting control module 84 is connected to the first voltage terminal ELVDD, the enable signal terminal EM, the first node N1, the second node N2 and the light emitting device 52, and the first reset module 86 is connected to the third node N3, the first reset signal terminal Vint1 and the reset control signal terminal Reset, the compensation stage t2 is used to write the data signal into the first node N1, the second node N2 and the third node N3 in sequence, as shown in FIG. Fig.10 and Fig.11 As shown, in step S41, before each compensation stage t2, it also includes:

[0149] Step S61: Reset phase t1, providing a first reset signal to the first reset signal terminal Vint1, and providing a reset control signal (such as Fig.10 and Fig.11 Reset in the process) so that the first reset signal is written into the third node N3.

[0150] like Fig.10 As shown, after the multiple compensation stages t2 in step S41, or as Fig.11 As shown, after the single compensation phase t2, it may also include:

[0151] Step S71: Light-emitting stage t3, providing an enable signal (such as Fig.10 and Fig.11 EM in the figure) so that the light control module 84 cooperates with the driving module 82 to drive the light emitting device 52 to emit light.

[0152] It should be noted that the display driving method may also include more steps, which may be determined according to actual needs, and the present disclosure does not limit this. The detailed description and technical effects of the display driving method can refer to the above description of the gate driving circuit and the display panel, which will not be repeated here.

[0153] In the present disclosure, “plurality” means two or more, and “at least one” means one or more, unless otherwise clearly and specifically defined.

[0154] In the present disclosure, the orientation or positional relationship indicated by the terms "upper" and "lower" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0155] As used herein, the terms "comprises," "includes," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, product, or device. In the absence of further limitations, an element defined by the phrase "includes a ..." does not exclude the presence of additional identical elements in the process, method, commodity, or device that includes the element.

[0156] References herein to "one embodiment," "some embodiments," "exemplary embodiments," "one or more embodiments," "example," "an example," "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. Schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0157] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0158] When describing some embodiments, the expressions "coupled" and "connected" may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. As another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0159] “At least one of A, B, and C” has the same meaning as “at least one of A, B, or C” and both include the following combinations of A, B, and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0160] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0161] As used herein, the term "if" is optionally interpreted to mean "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined that" or "if [a stated condition or event] is detected" are optionally interpreted to mean "upon determining that" or "in response to determining that" or "upon detecting [a stated condition or event]" or "in response to detecting [a stated condition or event]," depending on the context.

[0162] The use of "for" or "configured to" herein is meant to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0163] The use of "based on" or "according to" herein is meant to be open and inclusive. A process, step, calculation or other action based on one or more of the conditions or values ​​may, in practice, be based on other conditions or exceed the values ​​described. A process, step, calculation or other action based on one or more of the conditions or values ​​may, in practice, be based on other conditions or exceed the values ​​described.

[0164] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of variation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0165] As used herein, "parallel", "perpendicular", "equal", and "flush" include the situations described and situations similar to the situations described, the range of which is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range for approximate parallelism may be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range for approximate perpendicularity may also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range for approximate equality may be, for example, that the difference between the two being equal is less than or equal to 5% of either one. "Flush" includes absolute flushness and approximate flushness, wherein the acceptable deviation range for approximate flushness may be, for example, that the distance between the two being flush is less than or equal to 5% of the size of either one.

[0166] It will be understood that when a layer or an element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present between the layer or element and the other layer or substrate.

[0167] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A gate drive circuit, comprising: The first frame start signal line and cascade circuit; The first frame start signal line is connected to the first input terminal of the cascade circuit and is configured to: transmit a first frame start signal to the cascade circuit in a first display stage; The cascade circuit comprises a plurality of shift registers cascaded to each other, each of the shift registers is connected to a clock signal line, an output end of the shift register is connected to a writing module in a pixel driving circuit, and the cascade circuit is configured to: output a first scanning signal step by step according to the first frame start signal and a clock signal input by the clock signal line; Among them, the effective level of the first frame start signal within one cycle overlaps with multiple pulse signals of the clock signal, the first scanning signal includes multiple scanning pulse signals within one cycle, and the writing module is used to write the data signal into the pixel driving circuit under the control of the first scanning signal.

2. The gate drive circuit according to claim 1, wherein: The gate drive circuit further includes: A second frame start signal line is connected to the second input terminal of the cascade circuit and is configured to: transmit a second frame start signal to the cascade circuit in a second display phase; The cascade circuit is further configured to: output a second scanning signal step by step according to the second frame start signal and the clock signal; Among them, the number of pulse signals whose effective level of the second frame start signal overlaps with the clock signal in one cycle is less than the number of pulse signals whose effective level of the first frame start signal overlaps with the clock signal in one cycle, and the number of scan pulse signals included in the second scan signal in one cycle is greater than or equal to 1, and less than the number of scan pulse signals included in the first scan signal in one cycle.

3. The gate driving circuit according to claim 2, wherein: The first frame start signal line and the second frame start signal line are independently provided, or share the same signal line.

4. The gate driving circuit according to claim 1, wherein: The number of pulse signals whose effective level of the first frame start signal overlaps with the clock signal within one cycle is greater than or equal to 2 and less than or equal to 5.

5. The gate driving circuit according to claim 2, wherein: An effective level of the second frame start signal in one period overlaps with a pulse signal of the clock signal.

6. The gate driving circuit according to claim 1, wherein: The effective level of the first frame start signal is a low level.

7. The gate driving circuit according to claim 2, wherein: The second frame start signal has the same voltage as the active level of the first frame start signal.

8. The gate drive circuit according to any one of claims 1 to 7, wherein: In the cascade circuit, the signal input end of the first-stage shift register is connected to the first input end and the second input end, the output end of the E-stage shift register is connected to the signal input end of the E+F-stage shift register, and the output end of the M-stage shift register is connected to the reset signal input end of the MN-stage shift register, wherein 1≤E<H, F≥1, E+F≤H, 1<M≤H, 1≤N<M, and E, F, H, M and N are all positive integers, and H is the total number of shift registers in the cascade circuit.

9. A display panel, comprising: A plurality of pixel driving circuits arranged in an array; A plurality of light emitting devices, wherein the light emitting devices are connected to a pixel driving circuit located in the same pixel; A plurality of scanning signal lines, wherein the scanning signal lines are connected to scanning signal terminals of pixel driving circuits located in the same row; A plurality of data signal lines, wherein the data signal lines are connected to data signal terminals of pixel driving circuits located in the same column; as well as The gate driving circuit according to any one of claims 1 to 8, wherein output ends of the plurality of shift registers in the cascade circuit are respectively connected to different scanning signal lines; The pixel driving circuit is configured to: write the data signal at the data signal end into the pixel driving circuit according to the signal at the scanning signal end, so as to drive the light emitting device to emit light.

10. The display panel according to claim 9, wherein: The multiple data signal lines include a first data signal line and a second data signal line, and the display panel also includes: a signal terminal, a first data selection circuit and a second data selection circuit, the first data signal line is connected to the signal terminal through the first data selection circuit, and the second data signal line is connected to the signal terminal through the second data selection circuit.

11. The display panel according to claim 9, wherein: The pixel driving circuit comprises: a writing module connected to the data signal terminal, the first node and the scanning signal terminal, and configured to: in a compensation phase, write the data signal into the first node in response to a signal at the scanning signal terminal; A driving module connected to the first node, the second node and the third node, and configured to: write the signal of the first node into the second node under the potential control of the third node; A compensation module, connected to the second node, the third node and the scan signal terminal, and configured to: in a compensation phase, write the signal of the second node into the third node according to the signal of the scan signal terminal; A light-emitting control module is connected to the first voltage terminal, the enable signal terminal, the first node, the second node and the light-emitting device, and is configured to: in a light-emitting stage, cooperate with the driving module according to the enable signal of the enable signal terminal to drive the light-emitting device to emit light; a storage module, connected to the first voltage terminal and the third node, and configured to store a signal of the third node; A first reset module is connected to the third node, the first reset signal terminal and the reset control signal terminal, and is configured to: write the signal of the first reset signal terminal into the third node according to the signal of the reset control signal terminal; and The second reset module is connected to the anode of the light emitting device, the second reset signal terminal and the scan signal terminal, and is configured to write the signal of the second reset signal terminal into the anode of the light emitting device according to the signal of the scan signal terminal.

12. The display panel according to any one of claims 9 to 11, wherein: In the display panel displaying multiple consecutive frames of the same picture, the brightness ratio of the first frame to the preset frame is the first frame brightness ratio, and the first frame brightness ratio is greater than or equal to 85%. The preset frame is any frame after the same picture is stably displayed.

13. A display device, comprising: The display panel according to any one of claims 9 to 12; as well as The display driver chip is connected to the display panel and is used to provide a driving signal to the display panel. The driving signal includes: the first frame start signal, the clock signal and the data signal.

14. A display driving method, applied to the display panel according to any one of claims 9 to 12, the display driving method comprising: providing a clock signal to the clock signal line so that the clock signal line transmits the clock signal to the shift register; In the first display stage, a first frame start signal is provided to the first frame start signal line so that the first frame start signal line transmits the first frame start signal to the cascade circuit, and the cascade circuit outputs a first scanning signal step by step according to the first frame start signal and the clock signal.

15. The display driving method according to claim 14, wherein: When the gate drive circuit further includes a second frame start signal line, and the second frame start signal line is connected to the second input terminal of the cascade circuit, after the step of providing a clock signal to the clock signal line, the method further includes: In the second display stage, a second frame start signal is provided to the second frame start signal line so that the second frame start signal line transmits the second frame start signal to the cascade circuit, and the cascade circuit outputs a second scanning signal step by step according to the second frame start signal and the clock signal.

16. The display driving method according to claim 15, wherein: Before the steps of providing the first frame start signal to the first frame start signal line and providing the second frame start signal to the second frame start signal line, the method further includes: Acquire display data, wherein the display data includes a previous frame of display data and a next frame of display data, wherein the previous frame of display data and the next frame of display data are display data of two adjacent frames; The previous frame display data is compared with the next frame display data, and according to the comparison result, the steps in the first display stage or the steps in the second display stage are executed.

17. The display driving method according to claim 16, wherein: The performing of the steps in the first display stage or the steps in the second display stage according to the comparison result includes: If the previous frame display data is different from the next frame display data, executing the steps in the first display stage; If the previous frame display data is the same as the next frame display data, the steps in the second display stage are performed.

18. The display driving method according to any one of claims 14 to 17, wherein: The first scanning signal includes a plurality of scanning pulse signals, the plurality of scanning signal lines include a first scanning signal line, the plurality of data signal lines include a first data signal line, the pixel driving circuit connected to the first scanning signal line and the first data signal line is a first pixel driving circuit, and after the step of providing the first frame start signal to the first frame start signal line so that the first frame start signal line transmits the first frame start signal to the cascade circuit, and the cascade circuit outputs the first scanning signal step by step according to the first frame start signal and the clock signal, the step further includes: A plurality of compensation stages are separated from each other, each of which comprises: inputting the scanning pulse signal to the scanning signal end of the first pixel driving circuit, providing a data signal to the data signal end of the first pixel driving circuit, so that the data signal is written into the first pixel driving circuit.

19. The display driving method according to claim 18, wherein: The plurality of data signal lines further include a second data signal line, the display panel further includes a signal terminal, a first data selection circuit and a second data selection circuit, and the first data signal line is connected to the signal terminal through the first data selection circuit, and the second data signal line is connected to the signal terminal through the second data selection circuit. Before each of the compensation stages, the display panel further includes: The data signal is provided to the signal terminal, the first data selection circuit is controlled to be turned on, and the second data selection circuit is controlled to be turned off, so that the data signal is written into a first data storage capacitor, and one plate of the first data storage capacitor is connected to the first data signal line.

20. The display driving method according to claim 18, wherein: When the first pixel driving circuit includes a writing module, a driving module, a compensation module, a light emitting control module and a first reset module, and the writing module is connected to the data signal terminal, the first node and the scanning signal terminal, the driving module is connected to the first node, the second node and the third node, the compensation module is connected to the second node, the third node and the scanning signal terminal, the light emitting control module is connected to the first voltage terminal, the enable signal terminal, the first node, the second node and the light emitting device, and the first reset module is connected to the third node, the first reset signal terminal and the reset control signal terminal, the compensation stage is used to write the data signal into the first node, the second node and the third node in sequence, and before each of the compensation stages, it also includes: In a reset stage, a first reset signal is provided to the first reset signal terminal, and a reset control signal is provided to the reset control signal terminal, so that the first reset signal is written into the third node; After the multiple compensation stages, the method further includes: In the light-emitting stage, an enable signal is provided to the enable signal terminal so that the light-emitting control module cooperates with the drive module to drive the light-emitting device to emit light.

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