Multi-stage driving circuit and display panel

Abstract

The application discloses a multi-stage driving circuit and a display panel. The multi-stage driving circuit comprises a first driving circuit and a second driving circuit which are adjacent and connected with each other. The first driving circuit comprises a first input module, a first output module, a second output module, a first pull-down module and a first isolation module. The second driving circuit comprises a second input module, a third output module, a fourth output module, a second pull-down module and a second isolation module. The first control end of the first isolation module is connected with the first pull-down module on the same driving signal line, and the second control end of the first isolation module is connected with the second pull-down module in the second driving circuit on the same driving signal line. The first control end of the second isolation module is connected with the second pull-down module on the same driving signal line, and the second control end of the second isolation module is connected with the first pull-down module in the first driving circuit on the same driving signal line. Through the above structure, the reliability and stability of the driving circuit are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a multi-stage driving circuit and a display panel. BACKGROUND

[0002] Liquid crystal display has been widely applied due to its advantages of thin body, power saving, no radiation and so on. With the improvement of living standards, people have put forward higher requirements for display products, such as lower price, narrower frame and so on.

[0003] At present, in order to reduce the cost of products, array substrate type driving technology is usually used in the manufacturing process, that is, the traditional gate driving chip is abandoned, and the gate driving circuit structure is directly made on the glass substrate of the display panel, so that the chip driving on both sides of the display panel is no longer needed, which greatly reduces the product cost.

[0004] In order to achieve smooth driving effect, the common array substrate type driving technology usually precharges the output circuit shared work node (Quiescent point) to achieve a higher voltage level, so that the subsequent clock signal can be coupled into an ideal signal waveform. When the switch of the thin film transistor is opened, the gate level scanning signal required by the gate line can be successfully transmitted. However, this shared work node method can easily cause the voltage of the work node to be too high due to two pull-ups during the high voltage writing stage of the clock signal of the output circuit, which can damage the thin film transistor connected to the work node, cause abnormal output signal waveform, and further affect the entire circuit. SUMMARY

[0005] The technical problem solved by the present application is to provide a multi-stage driving circuit and a display panel. By alternating the work of the first driving signal line and the second driving signal line, the influence of the bias stress on the threshold voltage drift of the thin film transistor is reduced, the reliability and stability of the driving circuit are improved, the number of driving signal lines is reduced, and narrow frame is easy to achieve.

[0006] To solve the above problems, the first aspect of the present application provides a multi-stage drive circuit, comprising: adjacent and interconnected first drive circuit and second drive circuit; the first drive circuit comprises: a first input module, configured to output a first control signal when receiving a first trigger signal; a first output module, the control end of the first output module is connected with the output end of the first input module, configured to receive a first input signal, and output a corresponding first output signal according to the first control signal and the first input signal; a second output module, the control end of the second output module is connected with the output end of the first input module, configured to receive a second input signal, and output a corresponding second output signal according to the first control signal and the second input signal; a first pull-down module, the first pull-down module is connected with the first drive signal line, configured to pull down the first control signal and the output signals of the first output module and the second output module to low level when the first drive signal transmitted by the first drive signal line is high level, and stop pulling down when the first trigger signal is high level or the first control signal is high level; a first isolation module is arranged between the control end of the first output module and the control end of the second output module, the first control end of the first isolation module is connected with the first drive signal line, and the control end of the first output module and the control end of the second output module are made to be conductive when the first drive signal is high level; the second drive circuit comprises: a second input module, configured to output a second control signal when receiving a second trigger signal; a third output module, the control end of the third output module is connected with the output end of the second input module, configured to receive a third input signal, and output a corresponding third output signal according to the second control signal and the third input signal; a fourth output module, the control end of the fourth output module is connected with the output end of the second input module, configured to receive a fourth input signal, and output a corresponding fourth output signal according to the second control signal and the fourth input signal; a second pull-down module, the second pull-down module is connected with the second drive signal line, configured to pull down the second control signal and the output signals of the third output module and the fourth output module to low level when the second drive signal output by the second drive signal line is high level, and stop pulling down when the second trigger signal is high level or the second control signal is high level; a second isolation module is arranged between the control end of the third output module and the control end of the fourth output module, the first control end of the second isolation module is connected with the second drive signal line, and the control end of the fourth output module and the control end of the third output module are made to be conductive when receiving the second drive signal being high level.The first isolation module further includes a second control end, and the second control end of the first isolation module is connected to the second drive signal line, and is used for turning on the control end of the second output module and the control end of the first output module when the second drive signal is high.

[0007] In an embodiment, the second isolation module further includes a second control end, and the second control end of the second isolation module is connected to the first drive signal line, and is used for turning on the control end of the fourth output module and the control end of the third output module when the first drive signal is high.

[0008] In an embodiment, the first isolation module includes a first isolation transistor and a second isolation transistor, the gate of the first isolation transistor is connected to the first drive signal line, and is used for turning on the control end of the second output module and the control end of the first output module when the first drive signal is high, and the gate of the second isolation transistor is connected to the second drive signal line, and is used for turning on the control end of the second output module and the control end of the first output module when the second drive signal is high.

[0009] In an embodiment, the second isolation module includes a third isolation transistor and a fourth isolation transistor, the gate of the third isolation transistor is connected to the second drive signal line, and is used for turning on the control end of the fourth output module and the control end of the third output module when the second drive signal is high, and the gate of the fourth isolation transistor is connected to the first drive signal line, and is used for turning on the control end of the fourth output module and the control end of the third output module when the first drive signal is high.

[0010] In an embodiment, the levels of the first drive signal and the second drive signal are opposite, and the first drive signal and the second drive signal switch the levels alternately according to a set frame.

[0011] In an embodiment, the first drive circuit further includes a first level transmission module, the control end of the first level transmission module is connected to the output end of the first input module, and is used for outputting a first level transmission signal when the first input signal and the first control signal are received, and the second drive circuit further includes a second level transmission module, the control end of the second level transmission module is connected to the output end of the second input module, and is used for outputting a second level transmission signal when the third input signal and the second control signal are received.

[0012] In a specific embodiment, the first driving circuit further comprises a first reset module, a control end of the first reset module receives a first reset signal, an input end of the first reset module is connected with an output end of the first input module, and an output end of the first reset module is connected with a low level; the second driving circuit further comprises a second reset module, a control end of the second reset module receives a second reset signal, an input end of the second reset module is connected with an output end of the second input module, and an output end of the second reset module is connected with a low level.

[0013] In a specific embodiment, the first pull-down module comprises a first pull-down maintaining unit and a first pull-down unit; an input end of the first pull-down maintaining unit is connected with the first driving signal line, a control end of the first pull-down maintaining unit is connected with an output end of the first input module, for outputting a first pull-down signal according to the first driving signal; the first pull-down signal is pulled down according to the first trigger signal and the first control signal; a control end of the first pull-down unit is connected with an output end of the first pull-down maintaining module, input ends of the first pull-down unit are respectively connected with an output end of the first input module, an output end of the first output module, an output end of the second output module and / or an output end of the first level transmission module, and an output end of the first pull-down unit is connected with a low level, for pulling down the first control signal, the output signal of the first output module, the output signal of the second output module and / or the output end of the first level transmission module to a low level when the first pull-down signal is received; the second pull-down module comprises a second pull-down maintaining unit and a second pull-down unit; an input end of the second pull-down maintaining unit is connected with the second driving signal line, a control end of the second pull-down maintaining unit is connected with an output end of the second input module, for outputting a second pull-down signal according to the second driving signal, and pulling down the second pull-down signal according to the second trigger signal and the second control signal; a control end of the second pull-down unit is connected with an output end of the second pull-down maintaining module, input ends of the second pull-down unit are respectively connected with an output end of the second input module, an output end of the third output module, an output end of the fourth output module and / or an output end of the second level transmission module, and an output end of the second pull-down unit is connected with a low level, for pulling down the second control signal, the output signal of the third output module, the output signal of the fourth output module and / or the output end of the second level transmission module to a low level when the second pull-down signal is received.

[0014] In a specific embodiment, the first pull-down unit further comprises a first sub-pull-down unit, a control end of the first sub-pull-down unit is connected with an output end of the second pull-down maintaining module, input ends of the first sub-pull-down unit are respectively connected with an output end of the first input module, an output end of the first output module, an output end of the second output module and / or an output end of the first level transmission module, and an output end of the first sub-pull-down unit is connected with a low level, for pulling down the first control signal, the output signal of the first output module, the output signal of the second output module and / or the output end of the first level transmission module to a low level when the second pull-down signal is received; the second pull-down unit further comprises a second sub-pull-down unit, a control end of the second sub-pull-down unit is connected with an output end of the first pull-down maintaining module, input ends of the second pull-down unit are respectively connected with an output end of the second input module, an output end of the third output module, an output end of the fourth output module and / or an output end of the second level transmission module, and an output end of the second sub-pull-down unit is connected with a low level, for pulling down the second control signal, the output signal of the third output module, the output signal of the fourth output module and / or the output end of the second level transmission module to a low level when the first pull-down signal is received.

[0015] To solve the above problems, the second aspect of the present application provides a display panel, the display panel comprises a display area and a non-display area, a plurality of pixel units are arranged on the display area, wherein the non-display area is provided with the multi-stage driving circuit in any one of the embodiments of the first aspect, and the multi-stage driving circuit is used for outputting a driving signal to the plurality of pixel units.

[0016] The beneficial effects of the present application are: by connecting one input module with two output modules, the two output modules are used to output driving signals, so that one input signal can output multi-stage driving signals. However, the two connected output modules are easy to interfere with each other, resulting in abnormal output. The present application isolates the two output modules in each driving circuit by the isolation module, reduces the mutual influence between the output modules in the same driving circuit, solves the problem that the output signals of the output modules are abnormal due to the shared working node, and at the same time, in order to save the increased number of wiring caused by the separate use of the driving signal line of the isolation module, the control end of the isolation module is connected with the pull-down module in the adjacent two driving circuits through the same driving signal line, so that the isolation module can work alternately, the stability of the isolation module is improved, the number of driving wiring is also reduced, and the frame of the display product is further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0018] Figure 1 Structure diagram of a first embodiment of a multi-stage driving circuit of the present application;

[0019] Figure 2 Structure diagram of a second embodiment of a multi-stage driving circuit of the present application;

[0020] Figure 3 Structure diagram of a third embodiment of a multi-stage driving circuit of the present application;

[0021] Figure 4 Structure diagram of a fourth embodiment of a multi-stage driving circuit of the present application;

[0022] Figure 5 Structure diagram of a fifth embodiment of a multi-stage driving circuit of the present application;

[0023] Figure 6 Structure diagram of a specific embodiment of a multi-stage driving circuit of the present application;

[0024] Figure 7 Structure diagram of an embodiment of a display panel of the present application.

[0025] Main label explanation of the drawings:

[0026] 11, first input module; 121, first output module; 122, second output module; 13, first pull-down module; 131, first pull-down maintaining unit; 132, first pull-down unit; 133 first sub-pull-down unit; 14, first isolation module; 15, first stage transmission module; 16 first reset module; 21, second input module; 221 third output module; 222 fourth output module; 23 second pull-down module; 231, second pull-down maintaining unit; 232 second pull-down unit; 233 second sub-pull-down unit; 24 second isolation module; 25 second stage transmission module; 26 second reset module; S-T1 first isolation transistor; S-T2 second isolation transistor; S-T3 third isolation transistor; S-T4 fourth isolation transistor; Q1 first node; Q2 second node; QB1 first pull-down node; QB2 second pull-down node. DETAILED DESCRIPTION

[0027] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0028] The terms used in the embodiments of the present application are merely for the purpose of describing particular embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are intended to include plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two, but does not exclude the case of including at least one.

[0029] It should be understood that the term "and / or" used herein is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this application generally represents an "or" relationship between the front and rear associated objects. The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0030] It should be understood that the terms "include", "contain" or any other variation used herein are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0031] It should be noted that if the present application has any directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indication also changes accordingly.

[0032] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in one embodiment” in various places in the specification are not necessarily referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments.

[0033] The application provides a multi-stage driving circuit. Specifically, please refer to Figure 1 , Figure 1 FIG. 1 is a structural schematic diagram of a first embodiment of the multi-stage driving circuit of the application. As shown in FIG. 1, the multi-stage driving circuit comprises adjacent first driving circuit GOA1 and second driving circuit GOA2. The first driving circuit GOA1 comprises a first input module 11, a first output module 121, a second output module 122, a first pull-down module 13, and a first isolation module 14. Figure 1

[0034] The first input module 11 is configured to output a first control signal Qout1 when receiving a first trigger signal Carry(n-4).

[0035] The control end of the first output module 121 is connected with the output end of the first input module 11, configured to receive a first input signal CLK1, and output a corresponding first output signal Gout(n) according to the first control signal Qout1 and the first input signal CLK1.

[0036] The control end of the second output module 122 is connected with the output end of the first input module 11, configured to receive a second input signal CLK2, and output a corresponding second output signal Gout(n+1) according to the first control signal Qout1 and the second input signal CLK2.

[0037] The input end of the first pull-down module 13 is connected with a first driving signal line, configured to pull down the first control signal Qout1, the output signal Gout(n) of the first output module 121, and the output signal Gout(n+1) of the second output module 122 to a low level when the first driving signal VDD-0 transmitted by the first driving signal line is at a high level, and stop the pull-down when the first trigger signal Carry(n-4) is at a high level or the first control signal Qout1 is at a high level.

[0038] ​The first isolation module 14 is arranged between the control end of the first output module 121 and the control end of the second output module 122, the first control end of the first isolation module 14 is connected with the first drive signal line, and when the first drive signal VDD-0 is high, the control end of the second output module 122 is kept in communication with the control end of the first output module 121. The first path end of the first isolation module 14 is connected with the control end of the first output module 121 and the output end of the first input module 11, and the second path end of the first isolation module 14 is connected with the control end of the second output module 122. Whether the control end of the first output module 121 and the control end of the second output module 122 are actively connected in communication is determined by the first drive signal VDD-0 received by the control end of the first isolation module 14. The first path end is the drain of a transistor, and the second path end is the source of the transistor.

[0039] The second drive circuit GOA2 includes a second input module 21, a third output module 221, a fourth output module 222, a second pull-down module 23, and a second isolation module 24.

[0040] The second input module 21 is configured to output a second control signal Qout2 when receiving a second trigger signal Carry(n-3).

[0041] The control end of the third output module 221 is connected with the output end of the second input module 21, configured to receive a third input signal CLK3, and output a corresponding third output signal Gout(n+2) according to the second control signal Qout2 and the third input signal CLK3.

[0042] The control end of the fourth output module 222 is connected with the output end of the second input module 21, configured to receive a fourth input signal CLK4, and output a corresponding fourth output signal Gout(n+3) according to the second control signal Qout2 and the fourth input signal CLK4.

[0043] The input end of the second pull-down module 23 is connected with the second drive signal line, configured to pull down the second control signal Qout2, the output signal Gout(n+2) of the third output module 221 and the output signal Gout(n+3) of the fourth output module 222 to a low level when the second drive signal VDD-1 output by the second drive signal line is high, and stop pulling down when the second trigger signal Carry(n-3) is high or the second control signal Qout2 is high.

[0044] The second isolation module 24 is arranged between the control end of the third output module 221 and the control end of the fourth output module 222, the first control end of the second isolation module 24 is connected with the second driving signal line, and when the second driving signal VDD-1 is high, the control end of the fourth output module 222 is connected with the control end of the third output module 221. The first pass end of the second isolation module 24 is connected with the control end of the third output module 221 and the output end of the second input module 21, and the second pass end of the second isolation module 24 is connected with the control end of the fourth output module 222. The first pass end is the drain of a transistor, and the second pass end is the source of the transistor.

[0045] In the embodiment, the first isolation module 14 further includes a second control end, the second control end of the first isolation module 14 is connected with the second driving signal line, and is used for connecting the control end of the second output module 122 with the control end of the first output module 121 when the second driving signal VDD-1 is high.

[0046] In the embodiment, when the control end of the first isolation module 14 receives the first driving signal VDD-0 or the second driving signal VDD-1 as high, the control end of the second output module 122 is connected with the control end of the first output module 121, so that the first control signal Qout1 output by the first input module 11 is transmitted to the control end of the second output module 122, so that the second output module 122 can transmit the second input signal CLK2. Through the alternate operation of the first driving signal VDD-0 and the second driving signal VDD-1, the working life and stability of the first isolation module 14 are improved while reducing the driving signal line.

[0047] Further, the control end of the second isolation module 24 also includes a second control end, the second control end of the second isolation module 24 is connected with the first driving signal line, and is used for connecting the control end of the fourth output module 222 with the control end of the third output module 221 when the first driving signal VDD-0 is high, so that the control end of the fourth output module 222 and the control end of the third output module 221 are pulled up or pulled down at the same time.

[0048] In other embodiments, the second control end of the second isolation module 24 is connected with the third driving signal line VDD-2 connected with the third pull-down module in the third driving circuit GOA3, and is sequentially cascaded downward. The third driving circuit GOA3 is arranged adjacent to the second driving circuit GOA2. Through this cascade, the control ability of the isolation module to the output module connected with each control end is improved.

[0049] Specifically, please further refer to Figure 2 , Figure 2This is a schematic diagram of the structure of the second embodiment of the multi-stage drive circuit of this application. Figure 2 As shown, the first isolation module 14 includes a first isolation transistor S-T1 and a second isolation transistor S-T2. The drains of both the first isolation transistor S-T1 and the second isolation transistor S-T2 are connected to the output terminal of the first input module 11 and the control terminal of the first output module 121, and their sources are both connected to the control terminal of the second output module 122. The gate (first control terminal) of the first isolation transistor S-T1 is connected to the first drive signal line and is used to conduct the control terminals of the first output module 121 and the second output module 122 when the first drive signal VDD-1 is high. The gate (second control terminal) of the second isolation transistor S-T2 is connected to the second drive signal line and is used to conduct the control terminals of the second output module 122 and the first output module 121 when the second drive signal VDD-1 is high, so as to transmit the first control signal output by the first input module 11 to the control terminal of the second output module 122, so that the second output module 122 can transmit the second input signal CLK2 according to the first control signal. Specifically, when the first control signal is high, the second output module 122 receives the second input signal CLK2 and outputs the second output signal Gout(n+1).

[0050] Further, the second isolation module 24 includes a third isolation transistor S-T3 and a fourth isolation transistor S-T4. The gate (first control terminal) of the third isolation transistor S-T3 is connected to the second drive signal line, and is used to turn on the control terminal of the fourth output module 222 and the control terminal of the third output module 221 when the second drive signal VDD-1 is high. The gate (second control terminal) of the fourth isolation transistor S-T4 is connected to the first drive signal line, and is used to turn on the control terminal of the fourth output module 222 and the control terminal of the third output module 221 when the first drive signal VDD-0 is high, so as to transmit the second control signal output by the second input module 21 to the control terminal of the fourth output module 222, so that the fourth output module 222 can transmit the fourth input signal CLK4 according to the second control signal. Specifically, when the second control signal is high, the fourth output module 222 receives the fourth input signal CLK4 and outputs the fourth output signal Gout(n+3).

[0051] In this embodiment, the levels of the first driving signal VDD-0 and the second driving signal VDD-1 are reversed. When the first driving signal VDD-0 is high, the second driving signal VDD-1 is low; when the first driving signal VDD-0 is low, the second driving signal VDD-1 is high. The first driving signal VDD-0 and the second driving signal VDD-1 alternately switch their level signals according to a set frame. For example, the first driving signal VDD-0 may be high in the first frame or frames 0-100, and low in the second frame or frames 100-200, etc., which is not limited here.

[0052] The beneficial effects of this embodiment are as follows: By including two isolation transistors in each isolation module, and connecting the gates of the two isolation transistors to the first drive signal line and the second drive signal line respectively, and by having the drive signals on the first and second drive signal lines work alternately (i.e., alternately at a high level), each isolation module remains in a conduction state under both the first drive signal VDD-0 and the second drive signal VDD-1, thereby keeping the connected output modules (first output module 121 and second output module 122) in a conduction state. Connecting the control terminals of each isolation module to the drive signal lines in the pull-down modules of the current stage drive circuit (GOA1) and the adjacent stage drive circuit (next stage GOA2 or previous stage GOA0) respectively saves on the number of drive signal lines required, avoids the need to separately set drive signal lines for the isolation modules, and facilitates the fabrication of narrow bezels.

[0053] Further, please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of the third embodiment of the multi-stage drive circuit of this application. Figure 3 As shown, the first driving circuit GOA1 further includes a first-stage transmission module 15. The control terminal of the first-stage transmission module 15 is connected to the output terminal of the first input module 11. The input terminal of the first-stage transmission module 15 is connected to the first input signal CLK1, and the output terminal is connected to the Nth-stage driving circuit. It is used to output the first-stage transmission signal Carry(n) when the first input signal CLK1 and the first control signal Qout1 are received. The second driving circuit GOA2 further includes a second-stage transmission module 25. The control terminal of the second-stage transmission module 25 is connected to the output terminal of the second input module 21. The input terminal of the second-stage transmission module 25 is connected to the third input signal CLK3, and the output terminal is connected to the N+1th-stage driving circuit or the Nth-stage driving circuit. It is used to output the second-stage transmission signal Carry(n+1) or Carry(n) when the third input signal CLK3 and the second control signal Qout2 are received. The second-stage transmission signal can be the same as or different from the first-stage transmission signal.

[0054] Further, please refer toFigure 4 , Figure 4 This is a schematic diagram of the structure of the fourth embodiment of the multi-stage drive circuit of this application. Figure 4 As shown, the first driving circuit GOA1 also includes a first reset module 16. The control terminal of the first reset module 16 receives a first reset signal Reset1. The input terminal of the first reset module 16 is connected to the output terminal of the first input module 11. The output terminal of the first reset module 16 is connected to a low level, which is used to discharge the first node Q1 when the first reset signal Reset1 is high, that is, to discharge the first control signal Qout1 to a low level.

[0055] The second drive circuit GOA2 also includes a second reset module 26. The control terminal of the second reset module 26 receives the second reset signal Reset2. The input terminal of the second reset module 26 is connected to the output terminal of the second input module 21, and the output terminal of the second reset module 26 is connected to a low level. When the received second reset signal Reset2 is high, the second node Q2 is discharged, that is, the second control signal Qout2 is discharged. The first reset signal Reset1 and the second reset signal Reset2 are reset signals transmitted on the same reset signal line. Thus, during the reset period, all pull-up nodes Q of the drive circuits are discharged, which is not limited here.

[0056] Further, please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of the fifth embodiment of the multi-stage drive circuit of this application. Figure 5 As shown, the first pull-down module 13 includes a first pull-down sustaining unit 131 and a first pull-down unit 132. The input terminal of the first pull-down sustaining unit 131 is connected to the first drive signal line VDD-0, and the control terminal of the first pull-down sustaining unit 131 is connected to the output terminal of the first input module 11. It is used to output a first pull-down signal QB1 according to the first drive signal VDD-0, and to pull down the first pull-down signal QB1 according to the first trigger signal and the first control signal. Specifically, when the first control signal of the first node Q1 is low and the first drive signal VDD-0 is high, the output first pull-down signal QB1 is high; when the first trigger signal is high and the first control signal is high, the first pull-down signal QB1 is pulled down to a low level.

[0057] The control end of the first pull-down unit 132 is connected with the output end of the first pull-down maintaining unit 131, the input end of the first pull-down unit 132 is respectively connected with the output end of the first input module 11, the output end of the first output module 121, the output end of the second output module 122 and / or the output end of the first level transmission module 15, and the output end of the first pull-down unit 132 is connected with low voltage, for pulling down the first control signal, the first output signal Gout(n) output by the first output module 121, the second output signal Gout(n+1) output by the second output module 122 and / or the output end of the first level transmission module 15 to low voltage when the first pull-down signal QB1 received is high voltage.

[0058] Further, the first pull-down module 13 further comprises a first sub-pull-down unit 133, the control end of the first sub-pull-down unit 133 is connected with the output end of the second pull-down maintaining module 231, the input end of the first sub-pull-down unit 133 is respectively connected with the output end of the first input module 11, the output end of the first output module 121, the output end of the second output module 122 and / or the output end of the first level transmission module 15, and the output end of the first sub-pull-down unit 133 is connected with low voltage. The first sub-pull-down unit 133 is used for pulling down the first control signal Qout1, the first output signal Gout(n), the second output signal Gout(n+1) and the output end of the first level transmission module 15 to low voltage when the second pull-down signal QB2 received is high voltage.

[0059] The second pull-down module 23 comprises a second pull-down maintaining unit 231 and a second pull-down unit 232. The input end of the second pull-down maintaining unit 231 is connected with the second driving signal line, the control end of the second pull-down maintaining unit 231 is connected with the output end of the second input module 21, for outputting the second pull-down signal QB2 according to the second driving signal VDD-1, and pulling down the second pull-down signal QB2 according to the second trigger signal Carry(n-3) and the second control signal. When the second trigger signal Carry(n-3) and the second control signal are high voltage, the second pull-down signal QB2 is low voltage.

[0060] The control end of the second pull-down unit 232 is connected with the output end of the second pull-down maintaining module 231, the input end of the second pull-down unit 232 is respectively connected with the output end of the second input module 21, the output end of the third output module 221, the output end of the fourth output module 222 and / or the output end of the second level transmission module 25, and the output end of the second pull-down unit 232 is connected with low voltage, for pulling down the second control signal, the third output signal Gout(n+2) output by the third output module 221, the fourth output signal Gout(n+3) output by the fourth output module 222 and / or the output end of the second level transmission module 25 to low voltage when the second pull-down signal QB2 received is high voltage.

[0061] Further, the second pull-down module 23 further comprises a second sub-pull-down unit 233, a control end of the second sub-pull-down unit 233 being connected with an output end of the second pull-down maintaining unit 231, an input end of the second sub-pull-down unit 233 being connected with an output end of the second input module 21, an output end of the third output module 221, an output end of the fourth output module 222 and / or an output end of the second stage transmission module 25 respectively, and an output end of the second sub-pull-down unit 233 being connected with a low level. The second sub-pull-down unit 233 is used for pulling down the second control signal, the third output signal Gout(n+2), the fourth output signal Gout(n+3) and the output end of the second stage transmission module 25 to a low level when the first pull-down signal QB1 is high.

[0062] In the embodiment, the two-stage input can realize the multi-stage (four-stage) output, greatly reducing the use of components, and further reducing the frame of the display product. Moreover, each output circuit does not affect each other, and the signal is more stable.

[0063] For details, please further refer to Figure 6 , Figure 6 which is a structural schematic diagram of a specific embodiment of the multi-stage driving circuit.

[0064] Taking the four-stage driving circuit as an example, the first driving circuit GOA1 comprises a first input module 11, a first output module 121, a first isolation module 14, a second output module 122 and a first pull-down module 13.

[0065] The second driving circuit GOA2 comprises a second input module 21, a third output module 221, a second isolation module 24, a fourth output module 222 and a second pull-down module.

[0066] Specifically, the first driving circuit GOA1 further comprises a first stage transmission module 15, a control end of the first stage transmission module 15 being connected with an output end of the first input module 11, and being used for outputting a first stage transmission signal Carry(n) when receiving a first control signal and a first input signal CLK1.

[0067] The second driving circuit GOA2 further comprises a second stage transmission module 25, a control end of the second stage transmission module 25 being connected with an output end of the second input module 21, and being used for outputting a second stage transmission signal Carry(n+1) when receiving a second control signal and a second input signal CLK2.

[0068] The structures of the first-stage transmission module 15 and the second-stage transmission module 25 can be set according to actual needs. For example, the first-stage transmission module 15 can include a first switch tube T1, a control end of the first switch tube T1 being connected with the first node Q1, an input end of the first switch tube T1 receiving a first input signal CLK1, and an output end of the first switch tube T1 outputting a first-stage transmission signal Carry(n).

[0069] The second-stage transmission module 25 can include a second switch tube T2, a control end of the second switch tube T2 being connected with the second node Q2, an input end of the second switch tube T2 receiving a third input signal CLK3, and an output end of the second switch tube T2 outputting a second-stage transmission signal Carry(n+1).

[0070] Further, the first driving circuit further includes a first reset module 16, a control end of the first reset module 16 receiving a reset signal Reset, an input end of the first reset module 16 being connected with an output end of the first input module 11, and an output end of the first reset module 16 being connected with the first low voltage VSS2.

[0071] The second driving circuit GOA2 further includes a second reset module 26, a control end of the second reset module 26 receiving the reset signal Reset, an input end of the second reset module 26 being connected with an output end of the second input module 21, and an output end of the second reset module 26 being connected with the first low voltage VSS2.

[0072] Specifically, the first reset module 16 can include a third switch tube T3, and the second reset module 26 can include a fourth switch tube T4, a control end of the third switch tube T3 and a control end of the fourth switch tube T4 respectively receiving the reset signal Reset, an input end of the third switch tube T3 being connected with the first node Q1, an input end of the fourth switch tube T4 being connected with the second node Q2, and an output end of the third switch tube T3 and an output end of the fourth switch tube T4 respectively being connected with the first low voltage VSS2.

[0073] When the reset signal Reset is at a high level, the third switch tube T3 and the fourth switch tube T4 are turned on, and the first node Q1 and the second node Q2 are pulled down to a low level.

[0074] Further, the first input module 11 can include a fifth switch tube T5, a control end of the fifth switch tube T5 being connected with an input end and receiving a first trigger signal Carry(n-4), an output end of the fifth switch tube T5 being the output end of the first input module 11 and being connected with the first node Q1.

[0075] When the first trigger signal Carry(n-4) is at a high level, the fifth switch tube T5 is turned on, the first control signal is at a high level, and the first node Q1 is at a high level.

[0076] The second input module 21 can include a sixth switch tube T6, a control end of the sixth switch tube T6 being connected with an input end and receiving a second trigger signal Carry(n-3), and an output end of the sixth switch tube T6 being an output end of the second input module 21 and being connected with the second node Q2.

[0077] When the second trigger signal Carry(n-3) is at a high level, the sixth switch tube T6 is turned on, the second control signal is at a high level, and the second node Q2 is at a high level.

[0078] Further, the first sub-output module 311 can include a seventh switch tube T7 and a first capacitor C1, a control end of the seventh switch tube T7 being connected with the first node Q1, an input end of the seventh switch tube T7 receiving the first input signal CLK1, an output end of the seventh switch tube T7 outputting a first output signal Gout(n), one end of the first capacitor C1 being connected with the control end of the seventh switch tube T7, and the other end of the first capacitor C1 being connected with the output end of the seventh switch tube T7.

[0079] The first isolation module 14 includes a first isolation transistor S-T1 and a second isolation transistor S-T2, a control end of the first isolation transistor S-T1 being connected with the first driving signal VDD-0, and a control end of the second isolation transistor S-T2 being connected with the second driving signal VDD-1. First ends (drain electrodes) of the first isolation transistor S-T1 and the second isolation transistor S-T2 are connected with the first node Q1, and second ends (source electrodes) of the first isolation transistor S-T1 and the second isolation transistor S-T2 are connected with control ends of the second output module 122. The control end of the first output module 121 and the control end of the second output module 122 in operation are spaced apart by the first isolation module 14, so that the first output module 121 and the second output module 122 work independently and avoid mutual interference. Specifically, due to the coupling effect of the second input signal CLK2, the voltage VQ3 of the third node Q3 is greater than VDD (including VDD-0 / VDD-1), at this time, Vth>0, VGS<Vth, and the isolation transistor (S-T1 or S-T2) is passively closed. Thus, the control end of the isolation transistor is in a closed state even at a high level, and then the first output module 121 and the second output module 122 work independently.

[0080] The second output module 122 can include an eighth switch tube T8 and a second capacitor C2, the control end of the eighth switch tube T8 is connected with the second end of the first isolation transistor S-T1 and the second isolation transistor S-T2, the input end of the eighth switch tube T8 receives the second input signal CLK2, the output end of the eighth switch tube T8 outputs the second output signal Gout(n+1), one end of the second capacitor C2 is connected with the control end of the eighth switch tube T8, and the other end of the second capacitor C2 is connected with the output end of the eighth switch tube T8.

[0081] The control end of the seventh switch tube T7 is connected with the first node Q1, the first node Q1 is high level when the first control signal is high level, the control end of the first isolation transistor S-T1 is connected with the first drive signal VDD-0, the control end of the second isolation transistor S-T2 is connected with the second drive signal VDD-1, when the first drive signal VDD-0 or the second drive signal VDD-1 is high level, the voltage between the gate and the source of the first isolation transistor S-T1 or the second isolation transistor S-T2 is greater than the conduction threshold value, the first isolation transistor S-T1 or the second isolation transistor S-T2 is turned on, the node Q3 is high level, the source of the first isolation transistor S-T1 or the second isolation transistor S-T2 is high level, the voltage between the gate and the source is less than the conduction threshold value, the first isolation transistor S-T1 or the second isolation transistor S-T2 is passively turned off, and the control end of the seventh switch tube T7 is isolated from the eighth switch tube T8 through the first isolation transistor S-T1 and the second isolation transistor S-T2; the seventh switch tube T7 outputs Gout(n) according to the first input signal CLK1, and the eighth switch tube T8 outputs Gout(n+1) according to the second input signal CLK2; wherein the first input signal is the first input signal CLK1, the second input signal is the second input signal CLK2, the first output signal is the drive signal Gout(n), and the second output signal is the drive signal Gout(n+1); the control end of the seventh switch tube T7 and the control end of the eighth switch tube T8 are isolated through the first isolation transistor S-T1 and the second isolation transistor S-T2, the condition of high voltage deterioration is improved, and the corresponding output signal is more stable.

[0082] The third output module 221 can include a ninth switch tube T9 and a third capacitor C3, the control end of the ninth switch tube T9 is connected with the second node Q2, the input end of the ninth switch tube T9 receives the third input signal CLK3, the output end of the ninth switch tube T9 outputs the third output signal Gout(n+2), one end of the third capacitor C3 is connected with the control end of the ninth switch tube T9, and the other end of the third capacitor C3 is connected with the output end of the ninth switch tube T9;

[0083] The second isolation module 24 includes a third isolation transistor S-T3 and a fourth isolation transistor S-T4. The control end of the third isolation transistor S-T3 is connected to the second driving signal VDD-1. The control end of the fourth isolation transistor S-T4 is connected to the first driving signal VDD-0. The first ends of the third isolation transistor S-T3 and the fourth isolation transistor S-T4 are connected to the second node Q2. The second ends of the third isolation transistor S-T3 and the fourth isolation transistor S-T4 are connected to the control end of the fourth output module 222.

[0084] The fourth output module 222 can include a tenth switch tube T10 and a fourth capacitor C4. The control end of the tenth switch tube T10 is connected to the second ends of the third isolation transistor S-T3 and the fourth isolation transistor S-T4. The input end of the tenth switch tube T10 receives a fourth input signal CLK4. The output end of the tenth switch tube T10 outputs a fourth output signal Gout(n+3). One end of the fourth capacitor C4 is connected to the control end of the tenth switch tube T10. The other end of the fourth capacitor C4 is connected to the output end of the tenth switch tube T10.

[0085] The control end of the ninth switch tube T9 is connected to the second node Q2. When the second control signal is high, the second node Q2 is high. The control end of the third isolation transistor S-T3 is connected to the second driving signal VDD-1. The control end of the fourth isolation transistor S-T4 is connected to the first driving signal VDD-0. When the first driving signal VDD-0 or the second driving signal VDD-1 is high, the voltage between the gate and the source of the third isolation transistor S-T3 or the fourth isolation transistor S-T4 is greater than the conduction threshold value. The third isolation transistor S-T3 or the fourth isolation transistor S-T4 is turned on. The fourth node Q4 is high. The source of the third isolation transistor S-T3 or the fourth isolation transistor S-T4 is high. The voltage between the gate and the source is less than the conduction threshold value. The third isolation transistor S-T3 or the fourth isolation transistor S-T4 is passively turned off. The control end of the ninth switch tube T9 is isolated from the tenth switch tube T10 by the third isolation transistor S-T3 and the fourth isolation transistor S-T4. The ninth switch tube T9 outputs Gout(n+2) according to the third input signal CLK3. The tenth switch tube T10 outputs Gout(n+3) according to the fourth input signal CLK4. The third input signal is the third input signal CLK3. The fourth input signal is the fourth input signal CLK4. The third output signal is the driving signal Gout(n+2). The fourth output signal is the driving signal Gout(n+3). The control end of the ninth switch tube T9 is isolated from the control end of the tenth switch tube T10 by the third isolation transistor S-T3 and the fourth isolation transistor S-T4. The high voltage deterioration is improved, so that the corresponding output signal is more stable.

[0086] The third capacitor C3 and the fourth capacitor C4 are mainly used for maintaining the voltage between the control end and the output end of the ninth switch tube T9 and the voltage between the control end and the output end of the tenth switch tube T10, so as to stabilize the output of the ninth switch tube T9 and the tenth switch tube T10.

[0087] Further, the first pull-down module 13 comprises a first pull-down maintaining unit 131 and a first pull-down unit 132 and a first sub-pull-down unit 133; a control end of the first sub-pull-down unit 133 is connected to the second pull-down maintaining unit 231 in the second driving circuit GOA2, so that the first node Q1 can be pulled down by the second pull-down node QB2. The stable pull-down of the first node Q1 is ensured by the first pull-down unit 132 and the first sub-pull-down unit 133, which plays a double insurance role and avoids the abnormality of the driving circuit due to the damage of the device in one of the units.

[0088] The first pull-down maintaining unit 131 can comprise an eleventh switch tube T11, a twelfth switch tube T12, a thirteenth switch tube T13, a fourteenth switch tube T14, a fifteenth switch tube T15 and a sixteenth switch tube T16.

[0089] The control end of the eleventh switch tube T11 is connected to the input end and receives the first driving signal VDD-0, the output end of the eleventh switch tube T11 is connected to the input end of the twelfth switch tube T12 and the control end of the thirteenth switch tube T13, the control end of the twelfth switch tube T12 is connected to the first node Q1, the output end of the twelfth switch tube T12 is connected to the first low level VSS2, the input end of the thirteenth switch tube T13 receives the first driving signal VDD-0, the output end of the thirteenth switch tube T13 is connected to the first pull-down node QB1 and outputs the first pull-down signal; the control end of the fourteenth switch tube T14 is connected to the first node Q1, the input end of the fourteenth switch tube T14 is connected to the first pull-down node QB1, the output end of the fourteenth switch tube T14 is connected to the first low level VSS2, the control end of the fifteenth switch tube T15 receives the trigger signal Carry(n-4), the input end of the fifteenth switch tube T15 is connected to the first pull-down node QB1, and the output end of the fifteenth switch tube T15 is connected to the first low level VSS2; the control end of the sixteenth switch tube T16 is connected to the second node Q2 and receives the second control signal, the input end of the sixteenth switch tube T16 is connected to the control end of the thirteenth switch tube T13, and the output end of the sixteenth switch tube T16 is connected to the first low level VSS2.

[0090] When the first driving signal VDD-0 is high, the eleventh switch tube T11 is turned on, the thirteenth switch tube T13 is turned on, the first pull-down node QB1 is high, and the first pull-down signal is high; when the first node Q1 is high, the twelfth switch tube T12 is turned on, the control end of the thirteenth switch tube T13 is low, the thirteenth switch tube T13 is turned off, the control end of the fourteenth switch tube T14 is high, the fourteenth switch tube T14 is turned on, and the first pull-down node QB1 is low; when the second node Q2 is high, the sixteenth switch tube T16 is turned on, the control end of the thirteenth switch tube T13 is low, the thirteenth switch tube T13 is turned off, and thus when the first control signal is high or the second control signal is high, the first pull-down signal is low, and the first output signal Gout(n), the second output signal Gout(n+1) and the first node Q1 are stopped from being pulled down.

[0091] When the first trigger signal Carry(n-4) received by the control end of the fifteenth switch tube T15 is high, the fifteenth switch tube T15 is turned on, and the first pull-down node QB1 is low, which further ensures that the first pull-down node QB1 is low when the first node Q1 is high.

[0092] Further, the second pull-down module 23 includes a second pull-down maintaining unit 231 and a second pull-down unit 232 and a second sub-pull-down unit 233.

[0093] The second pull-down maintaining unit 231 can include a seventeenth switch tube T17, an eighteenth switch tube T18, a nineteenth switch tube T19, a twentieth switch tube T20, a twenty-first switch tube T21 and a twenty-second switch tube T22.

[0094] The control end of the seventeenth switch tube T17 is connected with the input end, and receives the second driving signal VDD-1. The output end of the seventeenth switch tube T17 is connected with the input end of the eighteenth switch tube T18 and the control end of the nineteenth switch tube T19 respectively. The control end of the eighteenth switch tube T18 is connected with the second node Q2. The output end of the eighteenth switch tube T18 is connected with the first low level VSS2. The input end of the nineteenth switch tube T19 receives the second driving signal VDD-1. The output end of the nineteenth switch tube T19 is connected with the second pull-down node QB2, and outputs the second pull-down signal. The control end of the twentieth switch tube T20 is connected with the second node Q2. The input end of the twentieth switch tube T20 is connected with the second pull-down node QB2. The output end of the twentieth switch tube T20 is connected with the first low level VSS2. The control end of the twenty-first switch tube T21 receives the first trigger signal Carry(n-4). The input end of the twenty-first switch tube T21 is connected with the second pull-down node QB2. The output end of the twenty-first switch tube T21 is connected with the first low level VSS2. The control end of the twenty-second switch tube T22 is connected with the first node Q1, and receives the first control signal. The input end of the twenty-second switch tube T22 is connected with the control end of the nineteenth switch tube T19. The output end of the twenty-second switch tube T22 is connected with the first low level VSS2.

[0095] When the second driving signal VDD-1 is high level, the second pull-down signal is high level. When the second node Q2 is high level, the second pull-down node QB2 is low level. When the first node Q1 is high level, the twenty-second switch tube T22 is turned on, the control end of the nineteenth switch tube T19 is low level, the nineteenth switch tube T19 is turned off, and then when the first control signal is high level or the second control signal is high level, the second pull-down signal is low level, the second pull-down node QB2 is low level, and the third output signal Gout(n+2), the fourth output signal Gout(n+3) and the second node Q2 are stopped from being pulled down.

[0096] When the first trigger signal Carry(n-4) received by the control end of the twenty-first switch tube T21 is high level, the twenty-first switch tube T21 is turned on, the second pull-down node QB1 is low level, and further guarantee that when the first node Q1 is high level, the second pull-down node QB2 is low level, and the pulling down is stopped.

[0097] It should be noted that the levels of the first driving signal VDD-0 and the second driving signal VDD-1 are reversed, that is, when the first driving signal VDD-0 is high level, the second driving signal VDD-1 is low level.

[0098] Further, the first pull-down unit 132 includes a twenty-third switch tube T23, a twenty-fourth switch tube T24 and a twenty-fifth switch tube T25.

[0099] The control end of the twenty-third switch tube T23 is connected with the first pull-down node QB1 and receives a first pull-down signal, the input end of the twenty-third switch tube T23 is connected with the first node Q1, and the output end of the twenty-third switch tube T23 is connected with the first low voltage VSS2.

[0100] The control end of the twenty-fourth switch tube T24 is connected with the first pull-down node QB1 and receives the first pull-down signal, the input end of the twenty-fourth switch tube T24 is connected with the output end of the first sub-output module 311, and the output end of the twenty-fourth switch tube T24 is connected with the second low voltage VSS1.

[0101] The control end of the twenty-fifth switch tube T25 is connected with the first pull-down node QB1 and receives the first pull-down signal, the input end of the twenty-fifth switch tube T25 is connected with the output end of the second output module 122, and the output end of the twenty-fifth switch tube T25 is connected with the second low voltage VSS1.

[0102] The first sub-pull-down unit 133 can further include a twenty-sixth switch tube T26, a twenty-seventh switch tube T27 and a twenty-eighth switch tube T28.

[0103] The control end of the twenty-sixth switch tube T26 is connected with the second pull-down node QB2 and receives a second pull-down signal, the input end of the twenty-sixth switch tube T26 is connected with the first node Q1, and the output end of the twenty-sixth switch tube T26 is connected with the first low voltage VSS2.

[0104] The control end of the twenty-seventh switch tube T27 is connected with the second pull-down node QB2 and receives the second pull-down signal, the input end of the twenty-seventh switch tube T27 is connected with the output end of the first sub-output module 311, and the output end of the twenty-seventh switch tube T27 is connected with the second low voltage VSS1.

[0105] The control end of the twenty-eighth switch tube T28 is connected with the second pull-down node QB2 and receives the second pull-down signal, the input end of the twenty-eighth switch tube T28 is connected with the output end of the second output module 122, and the output end of the twenty-eighth switch tube T28 is connected with the second low voltage VSS1.

[0106] Thus, when the first pull-down signal is a high level or the second pull-down signal is a high level, the first node Q1, the output end of the first sub-output module 311 and the output end of the second output module 122 are pulled down.

[0107] The first pull-down unit 132 can further include a twenty-ninth switch tube T29, a control end of the twenty-ninth switch tube T29 receiving a first pull-down trigger signal Carry(n+4), an input end of the twenty-ninth switch tube T29 being connected to the first node Q1, and an output end of the twenty-ninth switch tube T29 being connected to the first low voltage VSS2. When the first pull-down trigger signal Carry(n+4) is at a high level, the first node Q1 is pulled down.

[0108] Further, the second pull-down unit 232 includes a thirtieth switch tube T30, a thirty-first switch tube T31, and a thirty-second switch tube T32.

[0109] The control end of the thirtieth switch tube T30 is connected to the second pull-down node QB2 and receives a second pull-down signal, the input end of the thirtieth switch tube T30 is connected to the second node Q2, and the output end of the thirtieth switch tube T30 is connected to the first low voltage VSS2.

[0110] The control end of the thirty-first switch tube T31 is connected to the second pull-down node QB2 and receives the second pull-down signal, the input end of the thirty-first switch tube T31 is connected to the output end of the third output module 221, and the output end of the thirty-first switch tube T31 is connected to the second low voltage VSS1.

[0111] The control end of the thirty-second switch tube T32 is connected to the second pull-down node QB2 and receives the second pull-down signal, the input end of the thirty-second switch tube T32 is connected to the output end of the fourth output module 222, and the output end of the thirty-second switch tube T32 is connected to the second low voltage VSS1.

[0112] The second sub-pull-down unit 233 includes a thirty-third switch tube T33, a thirty-fourth switch tube T34, and a thirty-fifth switch tube T35.

[0113] The control end of the thirty-third switch tube T33 is connected to the first pull-down node QB1 and receives a first pull-down signal, the input end of the thirty-third switch tube T33 is connected to the second node Q2, and the output end of the thirty-third switch tube T33 is connected to the first low voltage VSS2.

[0114] The control end of the thirty-fourth switch tube T34 is connected to the first pull-down node QB1 and receives the first pull-down signal, the input end of the thirty-fourth switch tube T34 is connected to the output end of the third output module 221, and the output end of the thirty-fourth switch tube T34 is connected to the second low voltage VSS1.

[0115] The control end of the thirty-fifth switch tube T35 is connected to the first pull-down node QB1 and receives the first pull-down signal, the input end of the thirty-fifth switch tube T35 is connected to the output end of the fourth output module 222, and the output end of the thirty-fifth switch tube T35 is connected to the second low voltage VSS1.

[0116] Thus, the second node Q2, the output end of the third output module 221 and the output end of the fourth output module 222 are pulled down when the first pull-down signal is at a low level or the second pull-down signal is at a low level.

[0117] The second pull-down unit further includes a thirty-sixth switch tube T36, a control end of the thirty-sixth switch tube T36 receives a second pull-down trigger signal Carry(n+5), an input end of the thirty-sixth switch tube T36 is connected to the second node Q2, and an output end of the thirty-sixth switch tube T36 is connected to the first low level VSS2. When the second pull-down trigger signal Carry(n+5) is at a high level, the second node Q2 is pulled down.

[0118] The first pull-down unit 132 further includes a thirty-seventh switch tube T37, and the first sub-pull-down unit 133 further includes a thirty-eighth switch tube T38. A control end of the thirty-seventh switch tube T37 is connected to the first pull-down node QB1 and receives a first pull-down signal, an input end of the thirty-seventh switch tube T37 is connected to the output end of the first stage transmission module 15, an output end of the thirty-seventh switch tube T37 is connected to the first low level VSS2, and the output end of the first stage transmission module 15 is pulled down to the low level when the first pull-down node QB1 is at a high level. A control end of the thirty-eighth switch tube T38 is connected to the second pull-down node QB2 and receives a second pull-down signal, an input end of the thirty-eighth switch tube T38 is connected to the output end of the first stage transmission module 15, and an output end of the thirty-eighth switch tube T38 is connected to the first low level VSS2. The output end of the first stage transmission module 15 is pulled down to the low level when the second pull-down node QB2 is at a high level.

[0119] The second pull-down unit 232 further includes a thirty-ninth switch tube T39, and the second sub-pull-down unit 233 further includes a fortieth switch tube T40. A control end of the thirty-ninth switch tube T39 is connected to the second pull-down node QB2 and receives a second pull-down signal, an input end of the thirty-ninth switch tube T39 is connected to the output end of the second stage transmission module 25, an output end of the thirty-ninth switch tube T39 is connected to the first low level VSS2, and the output end of the second stage transmission module 25 is pulled down to the low level when the second pull-down node QB2 is at a high level. A control end of the fortieth switch tube T40 is connected to the first pull-down node QB1 and receives a first pull-down signal, an input end of the fortieth switch tube T40 is connected to the output end of the second stage transmission module 25, and an output end of the fortieth switch tube T40 is connected to the first low level VSS2. The output end of the second stage transmission module 25 is pulled down to the low level when the first pull-down node QB1 is at a high level.

[0120] In the embodiment, when the first pull-down node QB1 is high, the thirty-seventh switch tube T37 and the fortieth switch tube T40 are turned on to pull down the output end of the first stage transmission module 15 and the output end of the second stage transmission module 25 respectively. When the second pull-down node QB2 is high, the thirty-eighth switch tube T38 and the thirty-ninth switch tube T39 are turned on to pull down the output end of the first stage transmission module 15 and the output end of the second stage transmission module 25 respectively, so as to realize the pull-down of the stage transmission signal when the first pull-down node QB1 is high or the second pull-down node QB2 is high.

[0121] In the embodiment, the control end of the first pull-down unit 132 and the first sub-pull-down unit 133 is connected with the first pull-down node QB1 and the second pull-down node QB2 respectively, so that when the first pull-down node QB1 is high or the second pull-down node QB2 is high, the first node Q1 is pulled down by the first pull-down unit 132 or the first sub-pull-down unit 133. The first node Q1 is pulled down by the first pull-down unit 132 or the first sub-pull-down unit 133 to ensure the pull-down of the first node Q1, which plays a double insurance pull-down role. When VDD-0 is high, the first pull-down node QB1 is charged with high level by the first pull-down maintaining unit 131, so that the first node Q1 is pulled down by the first pull-down unit 132; when VDD-1 is high, the second pull-down node QB2 is charged with high level by the second pull-down maintaining unit 231, so that the first node Q1 is pulled down by the first sub-pull-down unit 133. Further, the control end of the second pull-down unit 232 and the second sub-pull-down unit 233 is connected with the second pull-down node QB2 and the first pull-down node QB1 respectively, so that when VDD-1 is high, the second pull-down node QB2 is high, the second node Q2 is pulled down by the second pull-down unit 232; when VDD-0 is high, the first pull-down node QB1 is high, the second node Q2 is pulled down by the second sub-pull-down unit 233. Wherein, the levels of VDD-0 and VDD-1 are opposite, VDD-0 is high and VDD-1 is low when VDD-0 is high, VDD-1 is high when VDD-0 is low, so that the first pull-down unit 132 and the first sub-pull-down unit 133 work alternately, and the second pull-down unit 232 and the second sub-pull-down unit 233 work alternately. Further, the first isolation transistor S-T1 and the second isolation transistor S-T2 work alternately, and the third isolation transistor S-T3 and the fourth isolation transistor S-T4 work alternately.

[0122] Further, the whole cascade driving circuit alternately connects the first driving signal VDD-0 and the second driving signal VDD-1, for example, the first driving circuit GOA1 connects VDD-0, the second driving circuit GOA2 connects VDD-1, the third driving circuit GOA3 connects VDD-0, the fourth driving circuit GOA4 connects VDD-1, and so on.

[0123] The application further provides a display panel, referring to Figure 7 , Figure 7 Fig. 1 is a structural schematic diagram of an embodiment of the display panel of the application. Figure 7 As shown in the figure, the display panel comprises a display area 1 and a non-display area 2, the display area 1 is provided with a plurality of pixel units, and the display panel further comprises a multi-stage driving circuit provided on the non-display area 2 to output a driving signal to drive the plurality of pixel units; the multi-stage driving circuit is configured as the multi-stage driving circuit in any one of the above embodiments.

[0124] The structure of the multi-stage driving circuit can refer to the above embodiments, which will not be repeated here. Naturally, since the display panel of the embodiment adopts the technical solution of the above multi-stage driving circuit, the display panel has all the beneficial effects of the above multi-stage driving circuit, the frame of the display panel is narrowed, and the output signal of each output circuit is more stable.

[0125] The above is only an embodiment of the application, and does not limit the patent scope of the application, any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the application.

Claims

1. A multi-stage drive circuit, characterized by, The first driving circuit and the second driving circuit are adjacent and connected with each other. The first driving circuit comprises: a first input module, configured to output a first control signal when a first trigger signal is received; a first output module, a control end of the first output module being connected with an output end of the first input module, configured to receive a first input signal and output a corresponding first output signal according to the first control signal and the first input signal; a second output module, a control end of the second output module being connected with the output end of the first input module, configured to receive a second input signal and output a corresponding second output signal according to the first control signal and the second input signal; a first pull-down module, the first pull-down module being connected with the first driving signal line, configured to pull down the first control signal and the output signals of the first output module and the second output module to a low level when a first driving signal transmitted by the first driving signal line is at a high level, and stop the pull-down when the first trigger signal is at a high level or the first control signal is at a high level; a first isolation module, arranged between the control end of the first output module and the control end of the second output module, a first control end of the first isolation module being connected with the first driving signal line, configured to make the control end of the first output module and the control end of the second output module conductive when the first driving signal is at a high level. The second driving circuit comprises: a second input module, configured to output a second control signal when a second trigger signal is received; a third output module, a control end of the third output module being connected with an output end of the second input module, configured to receive a third input signal and output a corresponding third output signal according to the second control signal and the third input signal; a fourth output module, a control end of the fourth output module being connected with the output end of the second input module, configured to receive a fourth input signal and output a corresponding fourth output signal according to the second control signal and the fourth input signal; a second pull-down module, the second pull-down module being connected with the second driving signal line, configured to pull down the second control signal and the output signals of the third output module and the fourth output module to a low level when a second driving signal output by the second driving signal line is at a high level, and stop the pull-down when the second trigger signal is at a high level or the second control signal is at a high level; a second isolation module, arranged between the control end of the third output module and the control end of the fourth output module, a first control end of the second isolation module being connected with the second driving signal line, configured to make the control end of the fourth output module and the control end of the third output module conductive when the second driving signal is received at a high level. The first isolation module further comprises a second control end, the second control end of the first isolation module being further connected with the second driving signal line, configured to make the control end of the second output module and the control end of the first output module conductive when the second driving signal is received at a high level. The second isolation module further comprises a second control end, the second control end of the second isolation module is connected with the first drive signal line, and the control end of the fourth output module and the control end of the third output module are turned on when the first drive signal is high. The levels of the first drive signal and the second drive signal are opposite, and the first drive signal and the second drive signal switch the levels alternately according to a set frame.

2. The multi-stage drive circuit of claim 1, wherein, The first isolation module comprises a first isolation transistor and a second isolation transistor; The gate of the first isolation transistor is connected with the first drive signal line, and the control end of the second output module and the control end of the first output module are turned on when the first drive signal is high. The gate of the second isolation transistor is connected with the second drive signal line, and the control end of the second output module and the control end of the first output module are turned on when the second drive signal is high.

3. The multi-stage drive circuit of claim 2, wherein, The second isolation module comprises a third isolation transistor and a fourth isolation transistor; The gate of the third isolation transistor is connected with the second drive signal line, and the control end of the fourth output module and the control end of the third output module are turned on when the second drive signal is high. The gate of the fourth isolation transistor is connected with the first drive signal line, and the control end of the fourth output module and the control end of the third output module are turned on when the first drive signal is high.

4. The multi-stage drive circuit according to claim 1, wherein The first drive circuit further comprises a first level transmission module, the control end of the first level transmission module is connected with the output end of the first input module, and the first level transmission module outputs a first level transmission signal when the first input signal and the first control signal are received; The second drive circuit further comprises a second level transmission module, the control end of the second level transmission module is connected with the output end of the second input module, and the second level transmission module outputs a second level transmission signal when the third input signal and the second control signal are received.

5. The multi-stage drive circuit according to claim 4, wherein The first drive circuit further comprises a first reset module, the control end of the first reset module receives a first reset signal, the input end of the first reset module is connected with the output end of the first input module, and the output end of the first reset module is connected with a low level; The second drive circuit further comprises a second reset module, the control end of the second reset module receives a second reset signal, the input end of the second reset module is connected with the output end of the second input module, and the output end of the second reset module is connected with a low level.

6. The multi-stage drive circuit according to claim 5, wherein The first pull-down module comprises a first pull-down maintaining unit and a first pull-down unit; The input end of the first pull-down maintaining unit is connected with the first driving signal line, the control end of the first pull-down maintaining unit is connected with the output end of the first input module, and the first pull-down signal is output according to the first driving signal; the first pull-down signal is pulled low according to the first trigger signal and the first control signal; The control end of the first pull-down unit is connected with the output end of the first pull-down maintaining module, the input end of the first pull-down unit is respectively connected with the output end of the first input module, the output end of the first output module, the output end of the second output module and / or the output end of the first level transmission module, and the output end of the first pull-down unit is connected with low voltage, so as to pull the first control signal, the output signal of the first output module, the output signal of the second output module and / or the output end of the first level transmission module to low voltage when the first pull-down signal is received; The second pull-down module includes a second pull-down maintaining unit and a second pull-down unit; The input end of the second pull-down maintaining unit is connected with the second driving signal line, the control end of the second pull-down maintaining unit is connected with the output end of the second input module, and the second pull-down signal is output according to the second driving signal, and the second pull-down signal is pulled low according to the second trigger signal and the second control signal; The control end of the second pull-down unit is connected with the output end of the second pull-down maintaining module, the input end of the second pull-down unit is respectively connected with the output end of the second input module, the output end of the third output module, the output end of the fourth output module and / or the output end of the second level transmission module, and the output end of the second pull-down unit is connected with low voltage, so as to pull the second control signal, the output signal of the third output module, the output signal of the fourth output module and / or the output end of the second level transmission module to low voltage when the second pull-down signal is received.

7. The multi-stage drive circuit of claim 6, wherein, The first pull-down unit further includes a first sub-pull-down unit, the control end of the first sub-pull-down unit is connected with the output end of the second pull-down maintaining module, the input end of the first sub-pull-down unit is respectively connected with the output end of the first input module, the output end of the first output module, the output end of the second output module and / or the output end of the first level transmission module, and the output end of the first sub-pull-down unit is connected with low voltage, so as to pull the first control signal, the output signal of the first output module, the output signal of the second output module and / or the output end of the first level transmission module to low voltage when the second pull-down signal is received. The second pull-down unit further comprises a second sub-pull-down unit, a control end of the second sub-pull-down unit is connected with an output end of the first pull-down maintaining module, input ends of the second pull-down unit are respectively connected with an output end of the second input module, an output end of the third output module, an output end of the fourth output module and / or an output end of the second stage transmission module, and an output end of the second sub-pull-down unit is connected with a low level, for pulling down the second control signal, an output signal of the third output module, an output signal of the fourth output module and / or an output end of the second stage transmission module to a low level when the first pull-down signal is received.

8. A display panel comprising a display area and a non-display area, a plurality of pixel units are arranged on the display area, characterized in that, The non-display area is provided with the multi-stage driving circuit according to any one of claims 1-7, and the multi-stage driving circuit is used for outputting a driving signal to the plurality of pixel units.

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