Scanning drive circuit and display panel

Abstract

The embodiment of the present application discloses a scan drive circuit and a display panel, including n cascaded scan drive units, the first signal output subunit in the J-th scan drive unit includes a first node, a second node, a first pull-down control module and a first output module, the first pull-down control module is connected to the first node and the second node, the second node is used to output a second potential to the first pull-down control module under the control of the j-2a-level transmission signal, so as to control the first pull-down control module to stop outputting the second potential to the first node. The first output module is connected to the first node, and the first node is used to charge to the first potential under the control of the j-2b-level transmission signal, so as to control the first output module to output the j-th level transmission signal and the j-th scanning signal. By controlling the charging of the first node through the j-2a-level transmission signal and the j-2b-level transmission signal output at different times, the charging delay of the first node is reduced, and the driving capability of the scan drive unit is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a scanning drive circuit and a display panel. Background Art

[0002] The Gate Driver Less (GDL) technology uses the original array process of the LCD panel to manufacture the driving circuit of the horizontal scan line on the substrate around the display area, so that it can replace the external integrated circuit (IC) to complete the driving of the horizontal scan line. GDL technology can reduce the welding process of the external IC, making the LCD panel more suitable for the production of narrow-frame or borderless display products.

[0003] At present, display panels using GDL technology have unstable display when running at low temperatures. Due to the influence of temperature on the switch tube in the scan drive circuit, the critical value of the turn-on voltage of the switch tube is different in different low-temperature environments. Therefore, how to increase the critical turn-on voltage of the switch tube to improve the reliability of the display panel in a low-temperature environment is an urgent problem to be solved. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present application provides a scan driving circuit and a display panel with higher reliability.

[0005] The present application provides a scan driving circuit, comprising n cascaded scan driving units, n being an integer greater than 1, the scan driving unit being used to output a level transmission signal to the mutually cascaded scan driving units to control the mutually cascaded scan driving units to output corresponding level transmission signals and scan signals. The J-th scan driving unit comprises a first signal output subunit, which is used to output a j-th level transmission signal and a j-th scan signal, wherein J is a natural number greater than 1 and less than or equal to n, j=2J-1, the first signal output subunit comprises a first node, a second node, a first pull-down control module and a first output module, the first pull-down control module is connected to the first node and the second node, the second node is used to output a second potential to the first pull-down control module under the control of the j-2a-th level transmission signal output by the Ja-th scan driving unit, so as to control the first pull-down control module to stop outputting the second potential to the first node. The first output module is connected to the first node, and the first node is used to charge to a first potential under the control of the j-2b-th level transmission signal output by the Jb-th scan driving unit to control the first output module to output the j-th level transmission signal and the j-th scan signal, wherein 1<b<a<n, and a and b are integers.

[0006] Optionally, the first signal output subunit also includes a first maintaining module, which is connected to the power supply voltage terminal and the second node, and is used to provide a power supply voltage to the second node to maintain the potential of the second node at the first potential before the second node receives the jbth level transmission signal.

[0007] Optionally, the first signal output subunit also includes a second pull-down control module, which is connected to the first node, the second node and the output end of the j-2a level transmission signal. The second pull-down control module outputs the second potential to the second node under the control of the j-2a level transmission signal to control the first pull-down control module to stop outputting the second potential to the first node.

[0008] Optionally, the first signal output subunit further includes a first pull-up control module, which is connected to the output end of the jb-th level transmission signal, the DC power supply end and the first node, and is used to control the DC power supply to charge the first node to the first potential under the control of the jb-th level transmission signal. The first pull-down control module is also connected to the output end of the j+c-th level transmission signal, and is used to output the second potential to the first node under the control of the j+c-th level transmission signal, so as to control the first output module to stop outputting the j-th level transmission signal and the j-th scanning signal, where c is an integer greater than or equal to 1.

[0009] Optionally, the first signal output subunit also includes a first pull-down module, which is connected to the second node, the output end of the j-th level transmission signal and the output end of the j-th scanning signal. When the second node is the first potential, the pull-down module outputs the second potential to the output end of the j-th level transmission signal and the output end of the j-th scanning signal.

[0010] Optionally, the J-th scanning driving unit further includes a second signal output subunit, which is used to output the j+1-th level transmission signal and the j+1-th scanning signal, and the second signal output subunit includes a third pull-down control module, a second output module, a third node and a fourth node, and the third pull-down control module is connected to the third node and the fourth node, and the fourth node is used to output the second potential to the third pull-down control module under the control of the j-2a-th level transmission signal output by the Ja-th scanning driving unit, so as to control the third pull-down control module to stop outputting the second potential to the third node. The second output module is connected to the third node, and the third node is used to charge to the first potential under the control of the j-2b+1-th level transmission signal output by the Jb-th scanning driving unit, so as to control the second output module to output the j+1-th level transmission signal and the j+1-th scanning signal.

[0011] Optionally, the second signal output subunit also includes a second maintaining module, which is connected to the power supply voltage terminal and the fourth node, and is used to provide a power supply voltage to the fourth node to maintain the potential of the fourth node at the first potential before the fourth node receives the j-2b+1th level transmission signal.

[0012] Optionally, the second signal output subunit also includes a fourth pull-down control module, which is connected to the j-2a level signal output terminal, the third node and the fourth node. The fourth pull-down control module outputs the second potential to the fourth node under the control of the j-2a level signal to control the third pull-down control module to stop outputting the second potential to the third node.

[0013] Optionally, the second signal output subunit further includes a second pull-up control module, which is connected to the output end of the j-2b+1-th level transmission signal, the DC power supply end and the third node, and is used to control the DC power supply to charge the third node to the first potential under the control of the j-2b+1-th level transmission signal. The third pull-down control module is also connected to the output end of the j+c+1-th level transmission signal, and is used to output the second potential to the third node under the control of the j+c+1-th level transmission signal, so as to control the second output module to stop outputting the j+1-th level transmission signal and the j+1-th scanning signal.

[0014] The present application provides a display panel, including a plurality of pixel units arranged in a matrix in a display area, a data driving circuit, a timing control circuit and the aforementioned scanning driving circuit arranged in a non-display area. The scanning driving circuit drives the pixel units to display images in cooperation with the data driving circuit according to the gate output control signal output by the timing control circuit and the source output control signal output by the timing control circuit.

[0015] Compared with the existing technical problems, the first pull-down module is controlled by the j-2a level transmission signal to stop outputting the second potential to the first node, and the first node is charged to the first potential under the control of the j-2b level transmission signal. Since a is greater than b, the j-2a level transmission signal reaches the current scanning drive unit before the j-2b level transmission signal, thereby effectively reducing the charging time delay of the first node, reducing the output delay of the level transmission signal and the scanning signal, and improving the charging capacity of the scanning drive unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of the structure of a display device provided in the first embodiment of the present application;

[0018] Figure 2 for Figure 1 A schematic diagram of the side structure of the display panel;

[0019] Figure 3 for Figure 2 A schematic diagram of the planar layout structure of the display panel;

[0020] Figure 4 for Figure 3 The structural schematic diagram of the scan drive circuit shown;

[0021] Figure 5 for Figure 4 Schematic diagram of the cascade of the GOA unit;

[0022] Figure 6 for Figure 5 Equivalent circuit diagram of the GOA unit;

[0023] Figure 7 for Figure 6 Normal waveform of scanning signal output at normal temperature;

[0024] Figure 8 for Figure 6 Abnormal waveform of scanning signal output at normal temperature;

[0025] Fig. 9 for Figure 6 The scanning signal outputs a normal waveform at medium and low temperatures;

[0026] Fig.10 for Figure 6 Abnormal waveform of scanning signal output at medium and low temperatures;

[0027] Fig.11 An equivalent circuit diagram of the GOA unit provided in the second embodiment of the present application;

[0028] Fig.12 for Fig.11 Mid-scan signal simulation waveform;

[0029] Fig.13 for Fig.11 Normal waveform of scanning signal output at normal temperature;

[0030] Fig.14 for Fig.11 The scanning signal outputs normal waveform at medium and low temperatures.

[0031] Description of the accompanying drawings: display device-100, display panel-10, power module-20, support frame 30, display area-10a, non-display area-10b, timing control circuit-11, data driving circuit-12, scanning driving circuit-13, pixel unit-P, backlight module-17, array substrate-10c, liquid crystal layer-10e, color film substrate-10d, first direction-F1, second direction-F2, m data lines-S1~Sm, 2n scanning lines-G1~G2n, clock signal-CLK, start signal-STV, reset signal-R, J-th scanning driving unit-GOA(J), J-4-th scanning driving unit-GOA4, J+5-th scanning driving unit-GOA(j+5), j-th level transmission signal-C(j), j+1-th level transmission signal-C(j+1), first signal output subunit-GDL1, second signal output subunit-GDL2, first pull-up control module-141, first output module-142, first pull-down control module-143A, second pull-down control module-143B, first pull-down module-144, first maintaining module-145, first node-Q1, second node-Q2, second pull-up control module-151, second output module-152, third pull-down control module-153A, fourth pull-down control module-153B, second pull-down module-154, second maintaining module-15 ... a third node-Q3, a fourth node-Q4, a first low voltage terminal-Vss1, a second low voltage terminal-Vss2, a power supply voltage terminal-VDD, a DC power supply terminal-VPC, an eleventh switch tube-T11, a twenty-first switch tube-T-21, a twenty-second switch tube-T22, a thirty-first switch tube-T31, a thirty-second switch tube-T32, a thirty-third switch tube-T33, a thirty-fourth switch tube-T34, a thirty-fifth switch tube-T35, a thirty-sixth switch tube-T36, a thirty-seventh switch tube-T37, a forty-first switch tube-T41, a forty-second switch tube-T42, a forty-third switch tube-T43, a forty-fourth switch tube-T44, a fifty-first switch tube-T51, a The fifty-second switch tube T52, the fifty-third switch tube T53, the sixty-first switch tube T61, the seventy-first switch tube T71, the seventy-second switch tube T72, the eighty-first switch tube T81, the eighty-second switch tube T82, the eighty-third switch tube T83, the eighty-fourth switch tube T84, the eighty-fifth switch tube T85, the eighty-sixth switch tube T86, the eighty-seventh switch tube T87, the ninety-first switch tube T91, the ninety-second switch tube T92, the ninety-third switch tube T93, the ninety-fourth switch tube T94, the ninety-fifth switch tube T95, the ninety-sixth switch tube T96, the ninety-seventh switch tube T97, and the ninety-eighth switch tube T98. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0033] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers for the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, 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 to the present application.

[0034] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should be noted that the terms "first", "second", etc. in the specification, claims, and drawings of the present application are used to distinguish different objects, rather than to describe a specific order.

[0035] In addition, the terms "include", "may include", "contain", or "may include" used in the present application indicate the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the terms "include" or "contain" indicate the existence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions. In addition, when describing the embodiments of the present application, "may" is used to indicate "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0037] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a display device provided in the first embodiment of the present application. The display device 100 includes a display panel 10, a power module 20 and a support frame 30. The display panel 10 and the power module 20 are fixed to the support frame 30. The power module 20 is arranged on the back of the display panel 10, that is, the non-display surface of the display panel 10. The power module 20 is used to provide a power supply voltage for the display panel 10 to display an image, and the support frame 30 provides a fixing and protection function for the display panel 10 and the power module 20.

[0038] In other embodiments of the present application, the display device 100 may not need to be provided with a supporting frame 30, for example, it is a portable electronic device such as a mobile phone, a tablet computer, etc.

[0039] See also Figure 2 , Figure 2 for Figure 1 Schematic diagram of the side structure of the display panel.

[0040] The display panel 10 includes a backlight module 17 (BM), wherein the backlight module 17 is used to provide display light to a display area 10a of the display panel 10, and the display panel 10 emits corresponding light according to an image signal to be displayed to perform image display.

[0041] The display panel 10 also includes other elements or components, such as a signal processor module and a signal sensing module.

[0042] In an exemplary embodiment, the display panel 10 may be a liquid crystal display panel or other types of display panels, which is not limited in the present application.

[0043] Taking a liquid crystal display panel as an example, the display panel 10 includes an array substrate (AS) 10c and a color film substrate (CF) 10d, and a liquid crystal layer 10e sandwiched between the array substrate 10c and the color film substrate 10d. Driving elements are arranged on the array substrate 10c and the color film substrate 10d to generate corresponding electric fields according to data signals (Data), thereby driving the liquid crystal molecules in the liquid crystal layer 10e to rotate to emit light of corresponding brightness to perform image display.

[0044] Please also read Figure 3 , Figure 3 for Figure 2 Schematic diagram of the planar layout structure of the display panel.

[0045] like Figure 3 As shown, the display panel 10 further includes a data driving circuit 12, a scan driving circuit 13 and a timing control circuit 11. The timing control circuit 11, the data driving circuit 12 and the scan driving circuit 13 are arranged in the non-display area 10b of the display panel 10.

[0046] In the display area 10a of the display panel 10, m data lines (Source lines) S1 to Sm and 2n scan lines (Gate lines) G1 to G2n are arranged in a grid shape. The m data lines S1 to Sm extend along a first direction F1, and the 2n scan lines G1 to G2n extend along a second direction F2. The first direction F1 and the second direction F2 are perpendicular to each other. The intersections of the 2n scan lines G1 to G2n and the data lines S1 to Sm are all correspondingly provided with pixel units P.

[0047] The timing control circuit 11 receives an image signal representing image information, a clock signal CLK for synchronization, a horizontal synchronization signal Hsyn, and a vertical synchronization signal Vsyn from an external signal source, and outputs a gate output control signal Cg for controlling the scan drive circuit 13, a source output control signal Cs for controlling the data drive circuit 12, and a data signal representing image information. In this embodiment, the timing control circuit 11 performs data adjustment processing on the original data signal to obtain a data signal, and transmits the data signal to the data drive circuit 12.

[0048] The m data lines S1-Sm are connected to the data driving circuit 11 for receiving data signals stored and transmitted in the form of grayscale values ​​provided by the data driving circuit 12. The 2n scanning lines G1-G2n are connected to the scanning driving circuit 13 for receiving scanning signals from the scanning driving circuit 13.

[0049] The pixel unit P receives the data voltage of the grayscale value in the corresponding data signal provided by the data lines S1~Sm in a predetermined time period under the control of the 2n scanning lines G1~G2n, and drives the liquid crystal layer 10e to deflect the corresponding angle accordingly, so that the received backlight emits light of corresponding brightness according to the corresponding deflection angle, so as to achieve image display by emitting light of corresponding brightness according to the image signal.

[0050] The scanning driving circuit 13 receives the gate output control signal Cg output by the timing control circuit 11, and outputs the scanning signal to each scanning line G1~G2n. The data driving circuit 12 receives the source output control signal Cs output by the timing control circuit 11, and outputs the data signal for driving the element in each pixel unit P in the display area 10a to perform image display to each data line S1~Sm. Among them, the data signal provided to the display panel 10 is a grayscale voltage in analog form. The scanning driving circuit 13 outputs the scanning signal to control the pixel unit P to receive the data signal output by the data driving circuit 12, so as to control the pixel unit P to display the corresponding image.

[0051] See also Figure 4 , Figure 4 for Figure 3 The structural diagram of the scanning driving circuit is shown in FIG. Figure 4 As shown, the scan driving circuit 13 includes n cascaded scan driving units 140, M clock signals CLK1-CLKM, a start signal STV, a reset signal R, a first low voltage terminal Vss1 and a second low voltage terminal Vss2, wherein n and M are integers greater than or equal to 1. For ease of description, the scan driving unit 140 is denoted by a GOA unit in the following text.

[0052] In an exemplary embodiment, the scan driving circuit 13 can also set the clock signal to any number for control according to specific needs, and this application does not limit this.

[0053] In this embodiment, eight clock signals are taken as an example, namely, the first clock signal CLK1 to the eighth clock signal CLK8. The scan driving circuit 13 includes n GOA units, each of which outputs two scan signals to two scan lines in the display area 10a. In the process of displaying a frame of image, the n GOA units sequentially output 2n scan signals G(1) to G(2n), that is, each GOA unit outputs two scan signals.

[0054] In an exemplary embodiment, the number of scan lines may be set according to the actual resolution of the display panel, and this application does not impose any limitation thereto.

[0055] The eight clock signals CLK1-CLK8 are used to provide a scan drive timing for the GOA unit to output a scan signal. The start signal STV is the start-up signal of the first GOA unit GOA1, and the other GOA units 140 use the stage transmission signal output by the cascaded GOA unit as the start signal. The first low voltage terminal Vss1 and the second low voltage terminal Vss2 are used to provide a low voltage for each node in the GOA unit.

[0056] See also Figure 5 , Figure 5 for Figure 4Schematic diagram of the cascade connection of GOA units. Figure 5 As shown,

[0057] Taking the Jth GOA unit GOA(J) as an example, the Jth GOA unit is used to output the jth level transmission signal and the j+1th level transmission signal, where j=2J-1, 1≤J≤n. The Jth GOA unit GOA(J) receives the j-7th level transmission signal and the j-8th level transmission signal output by the J-4th GOA unit GOA(J-4), and is used to pull up the node voltage in the Jth GOA unit GOA(J) to control the output of the jth level transmission signal and the j+1th level transmission signal in the Jth GOA unit GOA(J). The J+5th GOA unit GOA(J+5) outputs the j+10th level transmission signal C(j+10) and the j+11th level transmission signal C(J+11) to pull down the node voltage in the Jth GOA unit GOA(J), so as to control the jth level transmission signal and the j+1th level transmission signal in the Jth GOA unit GOA(J) to stop outputting.

[0058] For example, taking the fifth GOA unit as an example, the first level transmission signal C(1) and the second level transmission signal C(2) output by the first GOA unit GOA1 are used to pull up the node voltage in the fifth GOA unit GOA5 to control the output of the ninth level transmission signal and the tenth level transmission signal in the fifth GOA unit GOA5. The nineteenth level transmission signal C(19) and the twentieth level transmission signal C(20) output by the tenth GOA unit GOA10 are used to pull down the node voltage in the fifth GOA unit GOA5 to control the ninth level transmission signal and the tenth level transmission signal in the fifth GOA unit GOA5 to stop outputting.

[0059] Similarly, the Jth GOA unit outputs the jth level transmission signal C(j) and the j+1th level transmission signal C(j+1) to the J+4th GOA unit, which is used to pull up the node voltage in the J+4th GOA unit to control the output of the two level transmission signals in the J+4th GOA unit, and at the same time outputs it to the J-5th GOA unit, which is used to pull down the voltage of the two nodes in the J-5th GOA unit to control the two level transmission signals in the J-5th GOA unit to stop outputting.

[0060] Taking the 5th GOA unit GOA5 as an example, the 5th GOA unit outputs the 9th level transmission signal and the 10th level transmission signal to the 10th GOA unit, which is used to pull up the node voltage in the 10th GOA unit to control the output of the two level transmission signals in the 10th GOA unit, and at the same time outputs it to the 1st GOA unit, which is used to pull down the node voltage in the 1st GOA unit to control the two level transmission signals in the 1st GOA unit to stop outputting.

[0061] See also Figure 6 , Figure 6 for Figure 5 Equivalent circuit diagram of the GOA unit.

[0062] like Figure 6 As shown, each GOA unit includes two signal output subunits, namely, a first signal output subunit GDL1 and a second signal output subunit GDL2. Take the Jth GOA unit as an example, where 1≤J≤n. The first signal output subunit GDL1 is used to output the jth level transmission signal C(j) and the jth scanning signal G(j), and the second signal output subunit GDL2 is used to output the j+1th level transmission signal C(j+1) and the j+1th scanning signal G(j+1), j=2J-1.

[0063] The first signal output subunit GDL1 includes a first pull-up control module 141, a first output module 142, a first pull-down control module 143A, a second pull-down control module 143B, a first pull-down module 144, a first maintaining module 145, a first node Q1 and a second node Q2.

[0064] The second signal output subunit GDL2 includes a second pull-up control module 151, a second output module 152, a third pull-down control module 153A, a fourth pull-down control module 153B, a second pull-down module 154, a second maintaining module 155, a third node Q3 and a fourth node Q4.

[0065] Specifically, in the first signal output subunit GDL1, the first pull-up control module 141 is connected to the first node Q1 and receives the j-8th level transmission signal C(j-8) from the J-4th GOA unit. The j-8th level transmission signal C(j-8) is used to charge the first node Q1 and pull the first node Q1 from the second potential to the first potential, that is, the first potential is higher than the second potential.

[0066] The first output module 142 is connected to the i-th clock signal CLKi (1<i<M) and the first node Q1, and is used to receive the i-th clock signal and output the j-th level transmission signal C(j) and the j-th scanning signal G(j) under the control of the i-th clock signal CLKi when the first node Q1 is at the first potential. When the first node Q1 is at the second potential, it stops receiving the i-th clock signal and stops outputting the j-th level transmission signal C(j) and the j-th scanning signal G(j). The j-th level transmission signal C(j) is used to control the first signal output subunit GDL1 in the J+4th GOA unit to output the j+8th level transmission signal C(j+8) and the j+8th level scanning signal G(j+8), and at the same time controls the first signal output subunit GDL1 in the J-5th GOA unit to stop outputting the j-10th level transmission signal C(j-10) and the j-10th scanning signal G(j-10).

[0067] The first pull-down control module 143A is connected to the first node Q1, the second node Q2, the first low voltage terminal Vss1, the output terminal of the j+10th level transmission signal (not shown) and the first reset signal R1. The potential of the first node Q1 is pulled down to the second potential through the j+10th level transmission signal C(j+10). When each frame of the image is displayed, the first reset signal R1 is used to pull down the potential of the first node Q1 and the second node Q2 to the second potential to avoid circuit leakage accumulation. Through the setting of the first node and the second node, the voltage of the first node Q1 and the second node Q2 can be pulled down through the level transmission signal and the first reset signal R1, thereby effectively controlling the output and stop output of the scan signal and the level transmission signal in the first GDL unit.

[0068] The second pull-down control module 143B is connected to the first node Q1, the second node Q2, and the first low voltage terminal Vss1, and receives the j-8th level transmission signal C(j-8) output by the first GDL unit in the j-4th GOA unit. When the first pull-up control module 141 does not pull up the potential of the first node Q1, the potential of the second node Q2 is the first potential. At this time, the second node Q2 controls the first node Q1 to connect to the first low voltage terminal Vss1 through the first pull-down control module 143A so that the first node Q1 is at the second potential. When the second pull-down control module 143B and the first pull-up control module 141 receive the j-8th level transmission signal C(j-8), the second pull-down control module 143B pulls down the potential of the second node Q2 to the second potential, and the first pull-up control module 141 pulls up the potential of the first node Q1 to the first potential.

[0069] The first pull-down module 144 is connected to the second node Q2, the third node Q3, the first low voltage terminal Vss1, the second low voltage terminal Vss2, the output terminal (not shown) of the j-th level transmission signal C(j) and the output terminal (not shown) of the j-th scanning signal G(j). When the second node Q2 is at the first potential, the output terminal potential of the j-th level transmission signal is pulled down to the second potential, and the output of the j-th level transmission signal C(j) is controlled to stop, and the output terminal potential of the j-th scanning signal is pulled down to the second potential, and the output of the j-th scanning signal G(j) is controlled to stop.

[0070] The first maintaining module 145 is connected to the first node Q1, the second node Q2, the third node Q3, the power supply voltage terminal VDD and the first low voltage terminal Vss1. When the first pull-up control module 141 does not receive the j-9th level transmission signal C(j-9), that is, the first pull-up control module 141 does not charge the first node Q1, the first maintaining module 145 controls the second node Q2 to connect to the power supply voltage terminal VDD, for maintaining the potential of the second node Q2 at the first potential. When the second node Q2 is at the first potential, the second node Q2 controls the first node Q1 to connect to the first low voltage terminal Vss1 through the first pull-down control module 143A, thereby maintaining the potential of the first node Q1 at the second potential. When the first pull-up control module 141 receives the j-8th level transmission signal C(j-8), that is, the first pull-up control module 141 charges the first node Q1 to the first potential, the first maintaining module 145 controls the second node Q2 to connect to the first low voltage terminal Vss1, so that the second node Q2 is pulled down and maintained at the second potential. When the third node Q3 is at the first potential, the first maintaining module 145 controls the second node Q2 to stop receiving the power voltage.

[0071] More specifically, the first pull-up control module 141 includes an eleventh switch tube T11. The gate and source of the eleventh switch tube T11 are connected to the input end (not shown) of the j-8th level transmission signal C(j-8), and the drain is electrically connected to the first node Q1. When the eleventh switch tube T11 receives the j-8th level transmission signal C(j-8), the first pull-up control module 141 pulls up the potential of the first node Q1 to the first potential.

[0072] The first output module 142 includes a twenty-first switch tube T21 and a twenty-second switch tube T22. The twenty-first switch tube T21 is a first-level signal output switch tube, and the twenty-second switch tube T22 is a first scan signal output switch tube. Among them, the source of the twenty-first switch tube T21 is connected to the i-th clock signal CLKi, the gate is electrically connected to the first node Q1, and the drain is electrically connected to the output end (not shown) of the j-th level signal C(j). The source of the twenty-second switch tube T22 is connected to the i-th clock signal CLKi, the gate is electrically connected to the first node Q1, and the drain is electrically connected to the output end (not shown) of the j-th scan signal G(j). When the first node Q1 is the first potential, the twenty-first switch tube T21 and the twenty-second switch tube T22 output the j-th scan signal G(j) and the j-th level signal C(j) respectively.

[0073] The first pull-down control module 143A includes a thirty-first switch tube T31, a thirty-second switch tube T32, a thirty-third switch tube T33 and a thirty-fourth switch tube T34. Among them, the gate of the thirty-first switch tube T31 is connected to the first reset signal R1, the source is electrically connected to the first node Q1, and the drain is electrically connected to the first low voltage end Vss1, that is, the second potential. When the first reset signal R1 is received, the first node Q1 is controlled to be connected to the first low voltage end Vss1. The gate of the thirty-second switch tube T32 is electrically connected to the second node Q2, the source is electrically connected to the first node Q1, and the drain is electrically connected to the first low voltage end Vss1. When the second node Q2 is the first potential, the first node Q1 is controlled to be connected to the first low voltage end Vss1. The gate of the thirty-third switch tube T33 is connected to the j+10th level transmission signal C(j+10), the source is electrically connected to the first node Q1, and the drain is electrically connected to the first low voltage end Vss1. When the j+10th level transmission signal C(j+10) is received, the first node Q1 is controlled to be connected to the first low voltage end Vss1, thereby pulling down the first node Q1 to the second potential. The gate of the thirty-fourth switch tube T34 is electrically connected to the fourth node Q4, the source is electrically connected to the first node Q1, and the drain is electrically connected to the first low voltage end Vss1. When the fourth node Q4 is at the first potential, the first node Q1 is controlled to be connected to the first low voltage end Vss1, thereby pulling down the potential of the first node Q1 to the second potential.

[0074] The second pull-down control module 143B includes a thirty-fifth switch tube T35, a thirty-sixth switch tube T36, and a fifty-third switch tube T53. Among them, the gate of the thirty-fifth switch tube T35 is connected to the first node Q1, the source is electrically connected to the second node Q2, and the drain is electrically connected to the first low voltage end Vss1. When the first node Q1 is at the first potential, the second node Q2 is controlled to be connected to the first voltage potential Vss1, so as to pull down the potential of the second node Q2 to the second potential. The gate of the thirty-sixth switch tube T36 is connected to the input end (not shown) of the j-8th level transmission signal C(j-8), the drain is electrically connected to the first low voltage end Vss1, and the source is electrically connected to the second node Q2. Under the control of the j-8th level transmission signal C(j-8), the second node Q2 is controlled to be connected to the first low voltage end Vss1, so as to pull down the potential of the second node Q2 to the second potential.

[0075] The first pull-down module 144 includes a 41st switch tube T41, a 42nd switch tube T42, a 43rd switch tube T43, and a 44th switch tube T44. Among them, the gate of the 41st switch tube T41 is electrically connected to the second node Q2, the source is connected to the output end of the j-th level transmission signal C(j), and the drain is electrically connected to the first low voltage end Vss1. The gate of the 42nd switch tube T42 is electrically connected to the second node Q2, the source is connected to the output end of the j-th scan signal G(j), and the drain is electrically connected to the second low voltage end Vss2. When the second node Q2 is the first potential, the j-th scan signal G(j) and the j-th level transmission signal C(j) are controlled to stop outputting. The gate of the 43rd switch tube T43 is electrically connected to the fourth node Q4, the source is connected to the output end of the j-th scan signal G(j), and the drain is electrically connected to the second low voltage end Vss2. The gate of the forty-fourth switch tube T44 is electrically connected to the fourth node Q4, the source is connected to the output end of the j-th level transmission signal C(j), and the drain is electrically connected to the second low voltage end Vss2. When the fourth node Q4 is the first potential, the j-th scan signal G(j) and the j-th level transmission signal C(j) are controlled to stop output.

[0076] The first maintaining module 145 includes a fifty-first switch tube T51, a fifty-second switch tube T52, a fifty-third switch tube T53, and a fifty-fourth switch tube T54. The source and gate of the fifty-first switch tube T51 are electrically connected to the power supply voltage terminal VDD, and the drain is electrically connected to the gate of the fifty-second switch tube T52 and the source of the fifty-third switch tube T53. The source of the fifty-second switch tube T52 is electrically connected to the power supply voltage terminal VDD, and the drain is electrically connected to the second node Q2. The gate of the fifty-third switch tube T53 is electrically connected to the first node Q1, and the drain is electrically connected to the first low voltage terminal Vss1. The gate of the fifty-fourth switch tube T54 is electrically connected to the third node Q3, the source is electrically connected to the drain of the fifty-second switch tube T52, and the drain is electrically connected to the first low voltage terminal Vss1. When the first node Q1 and the third node Q3 are at the second potential, the second node Q2 is connected to the power supply voltage terminal VDD via the fifty-second switch tube T52 to receive the power supply voltage and maintain at the first potential. When the first node Q1 is at the first potential, the first node Q1 controls the second node Q2 to access the first voltage potential Vss1 through the thirty-fifth switch tube T35, so that the second node Q2 is maintained at the second potential. When the third node Q3 is at the first potential, the third node controls the second node Q2 to stop receiving the power supply voltage through the fifty-fourth switch tube T54.

[0077] In the second signal output subunit GDL2, the second pull-up control module 151 is connected to the third node Q3 and receives the j-7th level transmission signal C(j-7) output by the j-4th GOA unit. The j-7th level transmission signal C(j-7) is used to charge the third node Q3 and pull the potential of the third node Q3 from the second potential to the first potential.

[0078] The second output module 152 is connected to the i+1th clock signal CLKi+1 and the third node Q3. It is used to output the j+1th level transmission signal C(j+1) and the j+1th scanning signal G(j+1) under the control of the i+1th clock signal CLKi+1 when the potential of the third node Q3 is the first potential. When the potential of the third node Q3 is the second potential, it stops receiving the i+1th clock signal and stops outputting the j+1th level transmission signal C(j+1) and the j+1th scanning signal G(j+1). The j+1th level transmission signal C(j+1) is used to control the second signal output subunit GDL2 in the J+4th GOA unit to output the j+9th level transmission signal C(j+9) and the j+9th scanning signal G(j+9), and at the same time controls the second signal output subunit GDL2 in the J-5th GOA unit to stop outputting the j-9th level transmission signal C(j-9) and the j-9th scanning signal G(j-9).

[0079] The third pull-down control module 153A receives the second reset signal R2 and the j+11th level transmission signal C(j+11) output by the J+5th GOA unit at the third node Q3, the fourth node Q4 and the first low voltage terminal Vss1. The potential of the third node Q3 is pulled down to the second potential through the j+11th level transmission signal C(j+11). The potential of the third node Q3 and the fourth node Q4 is pulled down using the second reset signal R2. The third node Q3 is controlled to connect to the first low voltage terminal Vss1 through the third pull-down control module 153A.

[0080] The fourth pull-down control module 153B is connected to the third node Q3, the fourth node Q4, and the first low voltage terminal Vss1, and receives the j-8th level transmission signal C(j-8) output by the first GDL unit in the j-4th GOA unit. When the second pull-up control module 151 does not pull up the potential of the third node Q3, the potential of the fourth node Q4 is the first potential. At this time, the fourth node Q4 controls the third node Q3 to connect to the first low voltage terminal Vss1 through the third pull-down control module 153A so that the third node Q3 is at the second potential. When the fourth pull-down control module 153B and the second pull-up control module 151 receive the j-8th level transmission signal C(j-8), the fourth pull-down control module 153B pulls down the potential of the fourth node Q4 to the second potential, and the second pull-up control module 151 pulls up the potential of the third node Q3 to the first potential.

[0081] The second pull-down module 154 is connected to the output end (not shown) of the j+1-th level transmission signal C(j+1), the output end (not shown) of the j+1-th scanning signal G(j+1), the fourth node Q4, the first low voltage end Vss1 and the second low voltage end Vss2. When the fourth node Q4 is at the first potential, the output end of the j+1-th level transmission signal is controlled to be connected to the first low voltage end Vss1, and the output of the j+1-th level transmission signal C(j+1) is controlled to be stopped. The output end of the j+1-th scanning signal G(j+1) is connected to the second low voltage end Vss2, and the output of the j+1-th scanning signal G(j+1) is controlled to be stopped.

[0082] The second maintaining module 155 is connected to the first node Q1, the third node Q3, the fourth node Q4, the power supply voltage terminal VDD and the first low voltage terminal Vss1. When the second pull-up control module 151 does not receive the j-7th level transmission signal C(j-7), that is, the second pull-up control module 151 does not charge the third node Q3, the second maintaining module 155 controls the fourth node Q4 to connect to the power supply voltage terminal VDD, for maintaining the potential of the fourth node Q4 at the first potential. When the fourth node Q4 is at the first potential, the fourth node Q4 controls the third node Q3 to connect to the first low voltage terminal Vss1 through the third pull-down control module 153A, thereby maintaining the potential of the third node Q3 at the second potential. When the first pull-up control module 141 receives the j-8th level transmission signal C(j-8), that is, the first pull-up control module 141 charges the third node Q3 to the first potential, the second maintaining module 155 controls the fourth node Q4 to connect to the first low voltage terminal Vss1, so that the fourth node Q4 is pulled down and maintained at the second potential. When the first node Q1 is at the first potential, the second maintaining module 155 controls the fourth node Q4 to stop receiving the power voltage.

[0083] Specifically, the second pull-up control module 151 includes a sixty-first switch tube T61. The gate and source of the sixty-first switch tube T61 are connected to the input end (not shown) of the j-7th level transmission signal C(j-7), and the drain is electrically connected to the third node Q3. When the sixty-first switch tube T61 receives the j-7th level transmission signal C(j-7), the second pull-up control module 151 pulls up the potential of the third node Q3 to the first potential.

[0084] The second output module 152 includes a seventy-first switch tube T71 and a seventy-second switch tube T72, wherein the seventy-first switch tube T71 is a second-stage transmission signal output switch tube, and the seventy-second switch tube T72 is a second scanning signal output switch tube. Among them, the source of the seventy-first switch tube T71 is connected to the i+1 clock signal CLKi+1, the gate is electrically connected to the third node Q3, and the drain is electrically connected to the output end of the j+1-stage transmission signal C(j+1). The source of the seventy-second switch tube T72 is connected to the i+1 clock signal CLKi+1, the gate is electrically connected to the third node Q3, and the drain is electrically connected to the output end of the j+1-stage scanning signal G(j+1). When the third node Q3 is at the first potential, the seventy-first switch tube T71 outputs the j+1-stage transmission signal C(j+1), and the seventy-second switch tube T72 outputs the j+1-stage scanning signal G(j+1).

[0085] The third pull-down control module 153A includes an eighty-first switch tube T81, an eighty-second switch tube T82, an eighty-third switch tube T83 and an eighty-fourth switch tube T84. Among them, the gate of the eighty-first switch tube T81 is connected to the second reset signal R2, the source is electrically connected to the third node Q3, and the drain is electrically connected to the first low-voltage end Vss1. When the second reset signal R2 is received, the third node Q3 is controlled to be connected to the first low-voltage end Vss1. The gate of the eighty-second switch tube T82 is electrically connected to the fourth node Q4, the source is electrically connected to the third node Q3, and the drain is electrically connected to the first low-voltage end Vss1. When the fourth node Q4 is at the first potential, the third node Q3 is controlled to be connected to the first low-voltage end Vss1. The gate of the eighty-third switch tube T83 is connected to the input terminal (not shown) of the j+11th level transmission signal C(j+11), the source is electrically connected to the third node Q3, and the drain is electrically connected to the first low voltage terminal Vss1. When the j+11th level transmission signal C(j+11) is received, the third node Q3 is controlled to be connected to the first low voltage terminal Vss1, thereby pulling down the third node Q3 to the second potential. The gate of the eighty-fourth switch tube T84 is electrically connected to the second node Q2, the source is electrically connected to the third node Q3, and the drain is electrically connected to the first low voltage terminal Vss1. When the second node Q2 is the first potential, the third node Q3 is controlled to be connected to the first low voltage terminal Vss1, thereby pulling down the potential of the third node Q3 to the second potential.

[0086] The fourth pull-down control module 153B includes an eighty-fifth switch tube T85 and an eighty-sixth switch tube T86, wherein the gate of the eighty-fifth switch tube T85 is electrically connected to the third node Q3, the source is electrically connected to the fourth node Q4, and the drain is electrically connected to the first low voltage end Vss1. When the third node Q3 is at the first potential, the fourth node Q4 is controlled to be connected to the first voltage potential Vss1, so as to pull down the potential of the fourth node Q4 to the second potential. The gate of the eighty-sixth switch tube T86 is connected to the input end of the j-8th level transmission signal C(j-8), so as to receive the j-8th level transmission signal C(j-8), the source is electrically connected to the fourth node Q4, and the drain is electrically connected to the first low voltage end Vss1. Under the control of the j-8th level transmission signal C(j-8), the fourth node Q4 is controlled to be connected to the first low voltage end Vss1, so as to pull down the potential of the fourth node Q4 to the second potential.

[0087] The second pull-down module 154 includes a ninety-first switch tube T91, a ninety-second switch tube T92, a ninety-third switch tube T93, and a ninety-fourth switch tube T94. Among them, the gate of the ninety-first switch tube T91 is electrically connected to the fourth node Q4, the source is connected to the output end of the j+1-th level transmission signal C(j+1), and the drain is electrically connected to the first low voltage end Vss1. The gate of the ninety-second switch tube T92 is electrically connected to the fourth node Q4, the source is connected to the output end of the j+1-th scanning signal G(j+1), and the drain is electrically connected to the second low voltage end Vss2. When the fourth node Q4 is at the first potential, the j+1-th scanning signal G(j+1) and the j+1-th level transmission signal C(j+1) are controlled to stop outputting.

[0088] The gate of the ninety-third switch tube T93 is electrically connected to the second node Q2, the source is electrically connected to the output end of the j+1th scan signal G(j+1), and the drain is electrically connected to the second low voltage end Vss2. The gate of the ninety-fourth switch tube T94 is electrically connected to the second node Qb(2), the source is connected to the output end of the j+1th level transmission signal C(j+1), and the drain is electrically connected to the second low voltage end Vss2. When the second node Q2 is at the first potential, the j+1th scan signal G(j+1) and the j+1th level transmission signal C(j+1) are controlled to stop outputting.

[0089] The second maintaining module 155 includes a ninety-fifth switch tube T95, a ninety-sixth switch tube T96, a ninety-seventh switch tube T97, and a ninety-eighth switch tube T98. The source and gate of the ninety-fifth switch tube T95 are electrically connected to the power supply voltage terminal VDD, and the drain is electrically connected to the gate of the ninety-sixth switch tube T96 and the source of the ninety-seventh switch tube T97. The source of the ninety-sixth switch tube T96 is electrically connected to the power supply voltage terminal VDD, and the drain is electrically connected to the fourth node Q4. The gate of the ninety-seventh switch tube T97 is electrically connected to the third node Q3, and the drain is electrically connected to the first low voltage terminal Vss1. The gate of the ninety-eighth switch tube T98 is electrically connected to the first node Q1, the source is electrically connected to the drain of the ninety-sixth switch tube T96, and the drain is electrically connected to the first low voltage terminal Vss1. When the first node Q1 and the third node Q3 are at the second potential, the fourth node Q4 is connected to the power supply voltage terminal VDD via the ninety-sixth switch tube T96 to receive the power supply voltage and maintain at the first potential. When the third node Q3 is at the first potential, the third node Q3 controls the fourth node Q4 to access the first low-voltage terminal Vss1 through the eighty-fifth switch tube T85, so that the fourth node Q4 is maintained at the second potential. When the first node Q1 is at the first potential, the first node Q1 controls the fourth node Q4 to stop receiving the power supply voltage through the ninety-eighth switch tube T98.

[0090] See also Figure 7 , Figure 7 for Figure 6 Normal waveform of scanning signal output at normal temperature.

[0091] like Figure 7 As shown, a simulation experiment is carried out on the scan drive circuit 13 at room temperature (20℃~25℃), and the output waveform of the jth scan signal G(j) and the output waveform of the first node Q1 are tested when the turn-on voltage (VGH) of the switch tube in the scan drive circuit 13 is 14V. It can be seen from the figure that when VGH=14V, the output waveform of the jth scan signal G(j) and the first node Q1 are normal, that is, at room temperature, when a turn-on voltage of 14V is applied to the scan drive circuit 13, the scan drive circuit 13 can output the scan signal G(j) normally.

[0092] Please also read Figure 8 , Figure 8 for Figure 6 Abnormal waveform of scanning signal output at normal temperature.

[0093] like Figure 8As shown, a simulation experiment is conducted on the scan driving circuit 13 at room temperature (20°C-25°C), and the output waveform of the scan signal G(j) and the output waveform of the first node Q1 are tested when the turn-on voltage (VGH) of the switch tube in the scan driving circuit 13 is 13V. It can be seen from the figure that when VGH=13V, the output waveforms of the j-th scan signal G(j) and the first node Q1 are abnormal, that is, at room temperature, when a turn-on voltage of 13V is applied to the scan driving circuit 13, the scan driving circuit 13 cannot normally output the j-th scan signal G(j). Therefore, the critical turn-on voltage (VGH margin) of the above-mentioned scan driving circuit 13 at room temperature is equal to 14V.

[0094] See also Fig. 9 , Fig. 9 for Figure 6 The scanning signal outputs normal waveform at medium and low temperatures.

[0095] like Fig. 9 As shown, a simulation experiment is carried out on the scan driving circuit 13 at a low temperature (-20℃±5℃), and when the turn-on voltage (VGH) of the switch tube in the scan driving circuit 13 is 32V, the output waveform of the scan signal G(j) and the output waveform of the first node Q1 are tested. It can be seen from the figure that when VGH=32V, the output waveform of the jth scan signal G(j) and the first node Q1 are normal, that is, at a low temperature, when a turn-on voltage of 32V is applied to the scan driving circuit 13, the scan driving circuit 13 can normally output the jth scan signal G(j).

[0096] See also Fig.10 , Fig.10 for Figure 6 Abnormal waveform of scanning signal output under medium and low temperature.

[0097] like Fig.10 As shown, a simulation experiment is conducted on the scan driving circuit 13 at low temperature (-20℃±5℃), and the output waveform of the scan signal G(j) and the output waveform of the first node Q1 are tested when the turn-on voltage (VGH) of the switch tube in the scan driving circuit 13 is 31V. It can be seen from the figure that when VGH=31V, the output waveform of the j-th scan signal G(j) and the first node Q1 are normal, that is, when the turn-on voltage of 31V is applied to the scan driving circuit 13 at low temperature, the scan driving circuit 13 cannot normally output the j-th scan signal G(j). Therefore, the critical turn-on voltage (VGHmargin) of the above-mentioned scan driving circuit 13 at low temperature is equal to 32V.

[0098] Since the scan driving circuit 13 can work normally at 0°C when VGH margin≤14V at room temperature and VGH margin≤30V at low temperature, according to the above simulation results, the scan driving circuit 13 can work normally at a low temperature environment of about -5°C in this embodiment.

[0099] See also Fig.11 , Fig.11 This is an equivalent circuit diagram of the GOA unit provided in the second embodiment of the present application. Fig.11 As shown, the GOA unit includes a first signal output subunit GDL1 and a second signal output subunit GDL2. Taking the Jth GOA unit as an example, where 1≤J≤n. The first signal output subunit GDL1 is used to output the jth level transmission signal C(j) and the jth scanning signal G(j), and the second signal output subunit GDL2 is used to output the j+1th level transmission signal C(j+1) and the j+1th scanning signal G(j+1), where j=2J-1.

[0100] The first signal output subunit GDL1 includes a first output module 142, a first pull-down control module 143A, a first node Q1 and a second node Q2. The first pull-down control module 143A is connected to the first node Q1 and the second node Q2. The second node Q2 is used to output a second potential to the first pull-down control module 143A under the control of the j-2a-th level transmission signal output by the Ja-th GOA unit, so as to control the first pull-down control module 143A to stop outputting the second potential to the first node Q1. The first output module 142 is connected to the first node Q1, and the first node Q1 is used to charge to the first potential under the control of the j-2b-th level transmission signal output by the Jb-th GOA unit, so as to control the first output module 142 to output the j-th level transmission signal and the j-th scanning signal, wherein 1<b<a<n, and a and b are integers.

[0101] In an exemplary embodiment, a can be set to 5, b can be set to 4, and of course, they can be set to other numbers according to specific needs, which is not limited in this application.

[0102] The first pull-down control module 143A is controlled by the j-2a level transmission signal to stop outputting the second potential to the first node Q1, and the first node Q1 is charged to the first potential under the control of the j-2b level transmission signal. Since a is greater than b, the j-2a level transmission signal reaches the current GOA unit before the j-2b level transmission signal, so that the first node Q1 starts charging directly when receiving the j-2b level transmission signal without waiting for the first pull-down control module 143A to completely stop outputting the second potential, thereby effectively reducing the charging time delay of the first node Q1 and improving the charging capacity of the scan drive unit.

[0103] Specifically, taking a=5, b=4 as an example, the first signal output subunit GDL1 also includes a first pull-up control module 141, which is connected to the first node Q1 and the DC power supply terminal VPC, and receives the j-8th level transmission signal C(j-8) from the J-4th GOA unit. Under the control of the j-8th level transmission signal C(j-8), the DC power supply is received from the DC power supply terminal VPC, and the first node Q1 is charged by the DC power supply and the first node Q1 is pulled up from the second potential to the first potential, that is, the first potential is higher than the second potential. Since the first node Q1 is directly charged by the DC power supply under the control of the j-8th level transmission signal C(j-8), the potential rise time of the first node Q1 can be effectively improved, thereby reducing the output delay time of the j-th level transmission signal C(j) and the j-th scanning signal G(j).

[0104] The first output module 142 is connected to the i-th clock signal CLKi, (1<i<M) and the first node Q1. When the first node Q1 rises to the first potential under the control of the first pull-up control module 141, it receives the i-th clock signal and outputs the j-th level transmission signal C(j) and the j-th scanning signal G(j). When the first node Q1 is at the second potential, the first output module 142 stops receiving the i-th clock signal and stops outputting the j-th level transmission signal C(j) and the j-th scanning signal G(j). The j-th level transmission signal C(j) is used to control the first signal output subunit GDL1 in the J+4th GOA unit to output the j+8th level transmission signal C(j+8) and the j+8th level scanning signal G(j+8), and at the same time controls the first signal output subunit GDL1 in the J-5th GOA unit to stop outputting the j-10th level transmission signal C(j-10) and the j-10th scanning signal G(j-10). The j-th scanning signal G(j) is used to control the pixel unit P to display an image.

[0105] The first pull-down control module 143A is connected to the first node Q1, the second node Q2, the first low voltage terminal Vss, the output terminal of the j+c-th level transmission signal (not shown) and the first reset signal R1. It is used to pull down the potential of the first node Q1 to the second potential under the control of the j+c-th level transmission signal. When each frame of the image is displayed, the first reset signal R1 is used to pull down the potential of the first node Q1 and the second node Q2 to the second potential to avoid circuit leakage accumulation. Through the setting of the first node and the second node, the voltage of the first node Q1 and the second node Q2 can be pulled down by the level transmission signal and the first reset signal R1, thereby effectively controlling the output and stop output of the scan signal and the level transmission signal in the first GDL unit.

[0106] In an exemplary embodiment, c can be set to 10, that is, the first pull-down control module 143A is connected to the output end of the j+10th level transmission signal, and is used to receive the j+10th level transmission signal, and pull down the potential of the first node Q1 to the second potential under the control of the j+10th level transmission signal. Of course, c can also be set to other numbers according to specific needs, so as to control the first pull-down control module 143A through other level transmission signals, and this application does not limit it.

[0107] The first signal output subunit GDL1 further includes a second pull-down control module 143B, which is connected to the first node Q1, the second node Q2, the first low voltage terminal Vss1 and the output terminal (not shown) of the j-10th stage signal transmission. When the first pull-up control module 141 does not pull up the potential of the first node Q1, the second node Q2 receives the power supply voltage from the power supply voltage terminal VDD, so that the potential of the second node Q2 is maintained at the first potential. At this time, the second node Q2 controls the first node Q1 to connect to the first low voltage terminal Vss1 through the first pull-down control module 143A so that the first node Q1 is at the second potential. When the second pull-down control module 143B receives the j-10th level transmission signal C(j-10), the second pull-down control module 143B pulls down the potential of the second node Q2 to the second potential to control the first pull-down control module 143A to stop outputting the second potential to the first node Q1, that is, disconnecting the first node Q1 from the first low voltage terminal Vss1. After disconnection, the j-8th level transmission signal C(j-8) controls the first pull-up control module 141 to pull up the potential of the first node Q1 to the first potential.

[0108] Since the first node Q1 receives the DC power from the DC power supply terminal VPC for charging under the control of the j-8th level transmission signal C(j-8), and the second node Q2 is pulled down from the first potential to the second potential under the control of the j-10th level transmission signal C(j-10), the first node Q1 is disconnected from the first low-voltage terminal Vss1 before charging, thereby further reducing the delay time of charging the first node Q1 and improving the output speed of the signal, thereby improving the driving capability of the scan driving unit.

[0109] The first signal output subunit GDL1 further includes a first pull-down module 144, which is connected to the second node Q2, the third node Q3, the first low voltage terminal Vss1, the second low voltage terminal Vss2, the output terminal (not shown) of the j-th level transmission signal C(j), and the output terminal (not shown) of the j-th scanning signal G(j). When the second node Q2 is at the first potential, the first pull-down module 144 pulls down the output terminal potential of the j-th level transmission signal to the second potential to control the output of the j-th level transmission signal C(j), and pulls down the output terminal potential of the j-th scanning signal to the second low voltage terminal Vss2 to control the output of the j-th scanning signal G(j).

[0110] The first signal output subunit GDL1 also includes a first maintaining module 145, which is connected to the first node Q1, the second node Q2, the third node Q3, the power supply voltage terminal VDD and the first low voltage terminal Vss1. When the first pull-up control module 141 does not receive the j-8th level transmission signal C(j-8), that is, the first pull-up control module 141 does not charge the first node Q1, the first maintaining module 145 controls the second node Q2 to be connected to the power supply voltage terminal VDD, so as to maintain the potential of the second node Q2 at the first potential. When the second node Q2 is at the first potential, the second node Q2 controls the first node Q1 to be connected to the first low voltage terminal Vss1 through the first pull-down control module 143A, thereby maintaining the potential of the first node Q1 at the second potential. When the first pull-up control module 141 receives the j-8th level transmission signal C(j-8), that is, when the first pull-up control module 141 charges the first node Q1 to the first potential, the first maintenance module 145 controls the second node Q2 to connect to the first low voltage end Vss1, so that the second node Q2 is pulled down and maintained at the second potential, and at the same time, the second node Q2 controls the first pull-down control module 143A to stop outputting the second potential to the first node Q1, so that the first node Q1 can be charged to the first potential. When the third node Q3 is the first potential, the first maintenance module 145 controls the second node Q2 to stop receiving the power supply voltage.

[0111] More specifically, the first pull-up control module 141 includes an eleventh switch tube T11. The gate of the eleventh switch tube T11 is connected to the input terminal (not shown) of the j-8th stage transmission signal C(j-8), the source is connected to the DC power supply terminal VPC, and the drain is electrically connected to the first node Q1. When the eleventh switch tube T11 receives the j-8th stage transmission signal C(j-8), the first pull-up control module 141 pulls up the potential of the first node Q1 to the first potential.

[0112] The first output module 142 includes a twenty-first switch tube T21 and a twenty-second switch tube T22. The twenty-first switch tube T21 is a first-level signal output switch tube, and the twenty-second switch tube T22 is a first scan signal output switch tube. Among them, the source of the twenty-first switch tube T21 is connected to the i-th clock signal CLKi, the gate is electrically connected to the first node Q1, and the drain is electrically connected to the output end (not shown) of the j-th level signal C(j). The source of the twenty-second switch tube T22 is connected to the i-th clock signal CLKi, the gate is electrically connected to the first node Q1, and the drain is electrically connected to the output end (not shown) of the j-th scan signal G(j). When the first node Q1 is the first potential, the twenty-first switch tube T21 and the twenty-second switch tube T22 output the j-th scan signal G(j) and the j-th level signal C(j) respectively.

[0113] The first pull-down control module 143A includes a thirty-first switch tube T31, a thirty-second switch tube T32, a thirty-third switch tube T33 and a thirty-fourth switch tube T34. Among them, the gate of the thirty-first switch tube T31 is connected to the first reset signal R1, the source is electrically connected to the first node Q1, and the drain is electrically connected to the first low-voltage end Vss1. When the first reset signal R1 is received, the first node Q1 is controlled to be connected to the first low-voltage end Vss1. The gate of the thirty-second switch tube T32 is electrically connected to the second node Q2, the source is electrically connected to the first node Q1, and the drain is electrically connected to the first low-voltage end Vss1. When the second node Q2 is at the first potential, the first node Q1 is controlled to be connected to the first low-voltage end Vss1. The gate of the thirty-third switch tube T33 is connected to the j+10th level transmission signal C(j+10), the source is electrically connected to the first node Q1, and the drain is electrically connected to the first low voltage end Vss1. When the j+10th level transmission signal C(j+10) is received, the first node Q1 is controlled to be connected to the first low voltage end Vss1, thereby pulling down the first node Q1 to the second potential. The gate of the thirty-fourth switch tube T34 is electrically connected to the fourth node Q4, the source is electrically connected to the first node Q1, and the drain is electrically connected to the first low voltage end Vss1. When the fourth node Q4 is at the first potential, the first node Q1 is controlled to be connected to the first low voltage end Vss1, thereby pulling down the potential of the first node Q1 to the second potential.

[0114] The second pull-down control module 143B includes a thirty-fifth switch tube T35 and a thirty-sixth switch tube T36. The gate of the thirty-fifth switch tube T35 is connected to the first node Q1, the source is electrically connected to the second node Q2, and the drain is electrically connected to the first low voltage end Vss1. When the first node Q1 is at the first potential, the second node Q2 is controlled to be connected to the first voltage potential Vss1, so as to pull down the potential of the second node Q2 to the second potential. The gate of the thirty-sixth switch tube T36 is connected to the input end (not shown) of the j-10th level transmission signal C(j-10), the drain is electrically connected to the first low voltage end Vss1, and the source is electrically connected to the second node Q2. Under the control of the j-10th level transmission signal C(j-10), the second node Q2 is controlled to be connected to the first low voltage end Vss1, so as to pull down the potential of the second node Q2 to the second potential.

[0115] Since the thirty-sixth switch tube T36 is turned on by the j-10th level transmission signal C(j-10), the second node Q2 drops from the first potential to the second potential under the control of the j-10th level transmission signal C(j-10), thereby controlling the first node Q1 to be disconnected from the first low-voltage end Vss1 before charging through the thirty-fourth switch tube T34. When the j-8th level transmission signal C(j-8) controls the eleventh switch tube T11 to be turned on, the first node Q1 is charged. Since the j-10th level transmission signal C(j-10) is output before the j-8th level transmission signal C(j-8), the influence of the time delay caused by the second node Q2 controlling the closing time of the thirty-second switch tube T32 on the charging of the first node Q1 can be effectively avoided, thereby effectively improving the output speed of the signal.

[0116] The first pull-down module 144 is connected to the second node Q2, the third node Q3, the first low voltage terminal Vss1, the second low voltage terminal Vss2, the output terminal (not shown) of the j-th level transmission signal C(j) and the output terminal (not shown) of the j-th scanning signal G(j). When the second node Q2 is at the first potential, the output terminal potential of the j-th level transmission signal is pulled down to the second potential, and the output of the j-th level transmission signal C(j) is controlled to stop, and the output terminal potential of the j-th scanning signal is pulled down to the second potential, and the output of the j-th scanning signal G(j) is controlled to stop.

[0117] The first maintaining module 145 is connected to the first node Q1, the second node Q2, the third node Q3, the power supply voltage terminal VDD and the first low voltage terminal Vss1. When the first pull-up control module 141 does not receive the j-8th level transmission signal C(j-8), that is, the first pull-up control module 141 does not charge the first node Q1, the first maintaining module 145 controls the second node Q2 to connect to the power supply voltage terminal VDD, for maintaining the potential of the second node Q2 at the first potential. When the second node Q2 is at the first potential, the second node Q2 controls the first node Q1 to connect to the first low voltage terminal Vss1 through the first pull-down control module 143A, thereby maintaining the potential of the first node Q1 at the second potential. When the first pull-up control module 141 receives the j-8th level transmission signal C(j-8), that is, the first pull-up control module 141 charges the first node Q1 to the first potential, the first maintaining module 145 controls the second node Q2 to connect to the first low voltage terminal Vss1, so that the second node Q2 is pulled down and maintained at the second potential. When the third node Q3 is at the first potential, the first maintaining module 145 controls the second node Q2 to stop receiving the power voltage.

[0118] In the second signal output subunit GDL2, the second signal output subunit GDL2 includes a third pull-down control module 153A, a second output module 152, a third node Q3 and a fourth node Q4, the third pull-down control module 153A is connected to the third node Q3 and the fourth node Q4, the fourth node Q4 is used to output the second potential to the third pull-down control module 153A under the control of the j-2a-th level transmission signal output by the Ja-th GOA unit, so as to control the third pull-down control module 153A to stop outputting the second potential to the third node Q3. The second output module 152 is connected to the third node Q3, and the third node Q3 is used to charge to the first potential under the control of the j-2b+1-th level transmission signal output by the Jb-th GOA unit, so as to control the second output module 152 to output the j+1-th level transmission signal and the j+1-th scanning signal.

[0119] Specifically, taking a=5, b=4 as an example, the second signal output subunit GDL2 also includes a second pull-up control module 151, which is connected to the third node Q3 and the DC power supply terminal VPC, and receives the j-7th level transmission signal C(j-7) from the J-4th GOA unit. Under the control of the j-7th level transmission signal C(j-7), the DC power supply terminal VPC receives the DC power supply, charges the third node Q3 through the DC power supply, and pulls the third node Q3 from the second potential to the first potential, that is, the first potential is higher than the second potential. Since the third node Q3 is directly charged by the DC power supply under the control of the j-7th level transmission signal C(j-7), the potential rise time of the third node Q3 can be effectively improved, thereby reducing the output delay time of the j+1th level transmission signal C(j+1) and the j+1th scanning signal G(j+1).

[0120] The second output module 152 is connected to the i-th clock signal CLKi and the third node Q3. When the potential of the third node Q3 is the first potential, the j+1-th level transmission signal C(j+1) and the j+1-th scan signal G(j+1) are output. When the potential of the third node Q3 is the second potential, the i+1-th clock signal is stopped from being received and the j+1-th level transmission signal C(j+1) and the j+1-th scan signal G(j+1) are stopped from being output. The j+1-th level transmission signal C(j+1) is used to control the second signal output subunit GDL2 in the J+4-th GOA unit to output the j+9-th level transmission signal C(j+9) and the j+9-th scan signal G(j+9), and at the same time control the second signal output subunit GDL2 in the J-5-th GOA unit to stop outputting the j-9-th level transmission signal C(j-9) and the j-9-th scan signal G(j-9).

[0121] The third pull-down control module 153A receives the second reset signal R2 and the j+11th level transmission signal C(j+11) output by the J+5th GOA unit at the third node Q3, the fourth node Q4 and the first low voltage terminal Vss1. The potential of the third node Q3 is pulled down to the second potential through the j+11th level transmission signal C(j+11). The potential of the third node Q3 and the fourth node Q4 is pulled down using the second reset signal R2. The third node Q3 is controlled to connect to the first low voltage terminal Vss1 through the third pull-down control module 153A.

[0122] The second signal output subunit GDL2 further includes a fourth pull-down control module 153B connected to the third node Q3, the fourth node Q4, the first low voltage end Vss1 and the output end of the j-10th level transmission signal C(j-10). When the second pull-up control module 151 does not pull up the potential of the third node Q3, the potential of the fourth node Q4 is the first potential. At this time, the fourth node Q4 controls the third node Q3 to connect to the first low voltage end Vss1 through the third pull-down control module 153A so that the third node Q3 is at the second potential. When the fourth pull-down control module 153B receives the j-10th level transmission signal C(j-10), the fourth pull-down control module 153B pulls down the potential of the fourth node Q4 to the second potential. After the potential of the fourth node Q4 drops, the second pull-up control module 151 pulls up the potential of the third node Q3 to the first potential under the control of the j-7th level transmission signal C(j-7).

[0123] Since the third node Q3 receives the DC power from the DC power supply terminal VPC for charging under the control of the j-7th level transmission signal C(j-7), and the fourth node Q4 is pulled down from the first potential to the second potential under the control of the j-10th level transmission signal C(j-10), the third node Q3 is disconnected from the first low-voltage terminal Vss1 before charging, thereby further reducing the delay time of charging the third node Q3 and improving the output speed of the signal.

[0124] The second signal output subunit GDL2 further includes a second pull-down module 154, which is connected to the output end (not shown) of the j+1-th level transmission signal C(j+1), the output end (not shown) of the j+1-th scanning signal G(j+1), the fourth node Q4, the first low-voltage end Vss1, and the second low-voltage end Vss2. When the fourth node Q4 is at the first potential, the output end of the j+1-th level transmission signal is controlled to be connected to the first low-voltage end Vss1, and the output of the j+1-th level transmission signal C(j+1) is controlled to be stopped. The output end of the j+1-th scanning signal G(j+1) is connected to the second low-voltage end Vss2, and the output of the j+1-th scanning signal G(j+1) is controlled to be stopped.

[0125] The second signal output subunit GDL2 also includes a second maintaining module 155, which is connected to the first node Q1, the third node Q3, the fourth node Q4, the power supply voltage terminal VDD and the first low voltage terminal Vss1. When the second pull-up control module 151 does not receive the j-7th level transmission signal C(j-7), that is, the second pull-up control module 151 does not charge the third node Q3, the second maintaining module 155 controls the fourth node Q4 to be connected to the power supply voltage terminal VDD, so as to maintain the potential of the fourth node Q4 at the first potential. When the fourth node Q4 is at the first potential, the fourth node Q4 controls the third node Q3 to be connected to the first low voltage terminal Vss1 through the third pull-down control module 153A, thereby maintaining the potential of the third node Q3 at the second potential. When the first pull-up control module 141 receives the j-8th level transmission signal C(j-8), that is, when the first pull-up control module 141 charges the third node Q3 to the first potential, the second maintaining module 155 controls the fourth node Q4 to connect to the first low voltage terminal Vss1, so that the fourth node Q4 is pulled down and maintained at the second potential. When the first node Q1 is at the first potential, the second maintaining module 155 controls the fourth node Q4 to stop receiving the power supply voltage.

[0126] Specifically, the second pull-up control module 151 includes a sixty-first switch tube T61. The gate of the sixty-first switch tube T61 is connected to the input terminal (not shown) of the j-7th stage transmission signal C(j-7), the source is connected to the DC power supply terminal VPC, and the drain is electrically connected to the third node Q3. When the sixty-first switch tube T61 receives the j-7th stage transmission signal C(j-7), the second pull-up control module 151 pulls up the potential of the third node Q3 to the first potential.

[0127] The second output module 152 includes a seventy-first switch tube T71 and a seventy-second switch tube T72, wherein the seventy-first switch tube T71 is a second-stage transmission signal output switch tube, and the seventy-second switch tube T72 is a second scanning signal output switch tube. Among them, the source of the seventy-first switch tube T71 is connected to the i+1 clock signal CLKi+1, the gate is electrically connected to the third node Q3, and the drain is electrically connected to the output end of the j+1-stage transmission signal C(j+1). The source of the seventy-second switch tube T72 is connected to the i+1 clock signal CLKi+1, the gate is electrically connected to the third node Q3, and the drain is electrically connected to the output end of the j+1-stage scanning signal G(j+1). When the third node Q3 is at the first potential, the seventy-first switch tube T71 outputs the j+1-stage transmission signal C(j+1), and the seventy-second switch tube T72 outputs the j+1-stage scanning signal G(j+1).

[0128] The third pull-down control module 153A includes an eighty-first switch tube T81, an eighty-second switch tube T82, an eighty-third switch tube T83 and an eighty-fourth switch tube T84. Among them, the gate of the eighty-first switch tube T81 is connected to the second reset signal R2, the source is electrically connected to the third node Q3, and the drain is electrically connected to the first low-voltage end Vss1. When the second reset signal R2 is received, the third node Q3 is controlled to be connected to the first low-voltage end Vss1. The gate of the eighty-second switch tube T82 is electrically connected to the fourth node Q4, the source is electrically connected to the third node Q3, and the drain is electrically connected to the first low-voltage end Vss1. When the fourth node Q4 is at the first potential, the third node Q3 is controlled to be connected to the first low-voltage end Vss1. The gate of the eighty-third switch tube T83 is connected to the input terminal (not shown) of the j+11th level transmission signal C(j+11), the source is electrically connected to the third node Q3, and the drain is electrically connected to the first low voltage terminal Vss1. When the j+11th level transmission signal C(j+11) is received, the third node Q3 is controlled to be connected to the first low voltage terminal Vss1, thereby pulling down the third node Q3 to the second potential. The gate of the eighty-fourth switch tube T84 is electrically connected to the second node Q2, the source is electrically connected to the third node Q3, and the drain is electrically connected to the first low voltage terminal Vss1. When the second node Q2 is the first potential, the third node Q3 is controlled to be connected to the first low voltage terminal Vss1, thereby pulling down the potential of the third node Q3 to the second potential.

[0129] The fourth pull-down control module 153B includes an eighty-fifth switch tube T85 and an eighty-sixth switch tube T86. The eighty-fifth switch tube T85 has a gate connected to the third node Q3, a source electrically connected to the fourth node Q4, and a drain electrically connected to the first low voltage end Vss1. When the third node Q3 is at the first potential, the fourth node Q4 is controlled to be connected to the first voltage potential Vss1, so as to pull down the potential of the fourth node Q4 to the second potential. The eighty-sixth switch tube T86 has a gate connected to the input end (not shown) of the j-10th level transmission signal C(j-10), a drain electrically connected to the first low voltage end Vss1, and a source electrically connected to the fourth node Q4, so as to control the fourth node Q4 to be connected to the first low voltage end Vss1 under the control of the j-10th level transmission signal C(j-10), so as to pull down the potential of the fourth node Q4 to the second potential.

[0130] Since the eighty-sixth switch tube T86 is turned on by the j-10th level transmission signal C(j-10), the fourth node Q4 drops from the first potential to the second potential under the control of the j-10th level transmission signal C(j-10), thereby controlling the third node Q3 to be disconnected from the first low-voltage end Vss1 before charging through the eighty-fourth switch tube T84. When the j-7th level transmission signal C(j-7) controls the eleventh switch tube T11 to be turned on, the third node Q3 is charged. Since the j-10th level transmission signal C(j-10) is output before the j-7th level transmission signal C(j-7), the influence of the time delay caused by the fourth node Q4 controlling the closing time of the eighty-second switch tube T82 on the charging of the third node Q3 can be effectively avoided, thereby effectively improving the output speed of the signal.

[0131] The second pull-down module 154 includes a ninety-first switch tube T91, a ninety-second switch tube T92, a ninety-third switch tube T93, and a ninety-fourth switch tube T94. Among them, the gate of the ninety-first switch tube T91 is electrically connected to the fourth node Q4, the source is connected to the output end of the j+1-th level transmission signal C(j+1), and the drain is electrically connected to the first low voltage end Vss1. The gate of the ninety-second switch tube T92 is electrically connected to the fourth node Q4, the source is connected to the output end of the j+1-th scanning signal G(j+1), and the drain is electrically connected to the second low voltage end Vss2. When the fourth node Q4 is at the first potential, the j+1-th scanning signal G(j+1) and the j+1-th level transmission signal C(j+1) are controlled to stop outputting.

[0132] The gate of the ninety-third switch tube T93 is electrically connected to the second node Q2, the source is electrically connected to the output end of the j+1th scan signal G(j+1), and the drain is electrically connected to the second low voltage end Vss2. The gate of the ninety-fourth switch tube T94 is electrically connected to the second node Qb(2), the source is connected to the output end of the j+1th level transmission signal C(j+1), and the drain is electrically connected to the second low voltage end Vss2. When the second node Q2 is at the first potential, the j+1th scan signal G(j+1) and the j+1th level transmission signal C(j+1) are controlled to stop outputting.

[0133] The second maintaining module 155 includes a ninety-fifth switch tube T95, a ninety-sixth switch tube T96, a ninety-seventh switch tube T97, and a ninety-eighth switch tube T98. The source and gate of the ninety-fifth switch tube T95 are electrically connected to the power supply voltage terminal VDD, and the drain is electrically connected to the gate of the ninety-sixth switch tube T96 and the source of the ninety-seventh switch tube T97. The source of the ninety-sixth switch tube T96 is electrically connected to the power supply voltage terminal VDD, and the drain is electrically connected to the fourth node Q4. The gate of the ninety-seventh switch tube T97 is electrically connected to the third node Q3, and the drain is electrically connected to the first low voltage terminal Vss1. The gate of the ninety-eighth switch tube T98 is electrically connected to the first node Q1, the source is electrically connected to the drain of the ninety-sixth switch tube T96, and the drain is electrically connected to the first low voltage terminal Vss1. When the first node Q1 and the third node Q3 are at the second potential, the fourth node Q4 is connected to the power supply voltage terminal VDD via the ninety-sixth switch tube T96 to receive the power supply voltage and maintain at the first potential. When the third node Q3 is at the first potential, the third node Q3 controls the fourth node Q4 to access the first low-voltage terminal Vss1 through the eighty-fifth switch tube T85, so that the fourth node Q4 is maintained at the second potential. When the first node Q1 is at the first potential, the first node Q1 controls the fourth node Q4 to stop receiving the power supply voltage through the ninety-eighth switch tube T98.

[0134] See also Fig.12 , Fig.12 for Fig.11 Simulation waveform of the mid-scan signal.

[0135] like Fig.12 As shown, before the first node Q1 is charged, at the first moment t1, the potential of the second node Q2 drops under the control of the j-10th level transmission signal, and at the second moment t2, the first node Q1 is charged under the control of the j-8th level transmission signal. Since the potential of the second node Q2 drops before the first node Q1 is charged, the first pull-down control module 143A controls the first node Q1 to be disconnected from the first low-voltage end Vss1 in advance to prevent the potential drop time of the second node Q2 from affecting the charging time of the first node Q1, thereby improving the charging speed of the first node Q1, and further improving the output stability of the scan signal and the level transmission signal.

[0136] See also Fig.13 , Fig.13 for Fig.11 Normal waveform of scanning signal output at normal temperature.

[0137] like Fig.13As shown, a simulation experiment is carried out on the scan drive circuit 13 at room temperature (20℃~25℃), and the output waveform of the scan signal G(j) and the output waveform of the first node Q1 are tested when the turn-on voltage (VGH) of the switch tube in the scan drive circuit 13 is 11V. It can be seen from the figure that when VGH=11V, the output waveforms of the scan signal G(j) and the first node Q1 are normal, that is, at room temperature, when a turn-on voltage of 11V is applied to the scan drive circuit 13, the scan drive circuit 13 can output the scan signal G(j) normally, that is, the VGH margin of the scan drive circuit 13 at room temperature is 11V.

[0138] See also Fig.14 , Fig.14 for Fig.11 The scanning signal outputs normal waveform at medium and low temperatures.

[0139] like Fig.14 As shown, a simulation experiment is carried out on the scan driving circuit 13 at a low temperature (-20℃±5℃), and when the turn-on voltage (VGH) of the switch tube in the scan driving circuit 13 is 27V, the output waveform of the scan signal G(j) and the output waveform of the first node Q1 are tested. It can be seen from the figure that when VGH=27V, the output waveforms of the scan signal G(j) and the first node Q1 are normal, that is, at a low temperature, when a turn-on voltage of 27V is applied to the scan driving circuit 13, the scan driving circuit 13 can output the scan signal G(j) normally, that is, the VGH margin of the scan driving circuit 13 at a low temperature is 27V.

[0140] Since the scan driving circuit 13 can work normally in a -15°C environment when VGH margin ≤ 13V at room temperature and VGH margin ≤ 28V at low temperature, the scan driving circuit 13 can work normally in a -15°C environment. Therefore, according to the above simulation experiment results, it can be seen that the scan driving circuit 13 in this embodiment can work normally in a -15°C low temperature environment.

[0141] The potential change timing of the first node Q1 and the second node Q2 in the GOA unit is adjusted by the level transmission signal, so that before the second node Q2 is charged at the first node Q1, the first pull-down control module 143A is controlled to stop outputting the second potential to the first node Q1, so as to prepare for charging the first node Q1 in advance, reduce the charging delay of the first node Q1, thereby improving the driving capability of the GOA unit, and charge the first node Q1 with a DC current, further improving the charging speed of the first node, and improving the reliability and stability of the GOA unit in a low temperature environment by reducing the delay time of the GOA unit outputting the scanning signal.

[0142] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A scan driving circuit, comprising n cascaded scan driving units, where n is an integer greater than 1, and the scan driving units are used to output level transmission signals to the mutually cascaded scan driving units to control the mutually cascaded scan driving units to output corresponding level transmission signals and scan signals; It is characterized in that The J-th scan driving unit includes a first signal output subunit, which is used to output the j-th level transmission signal and the j-th scanning signal, wherein J is a natural number greater than 1 and less than or equal to n, j=2J-1, the first signal output subunit includes a first node, a second node, a first pull-down control module and a first output module, the first pull-down control module is connected to the first node and the second node, and the second node is used to output a second potential to the first pull-down control module under the control of the j-2a-th level transmission signal output by the Ja-th scan driving unit, so as to control the first pull-down control module to stop outputting the second potential to the first node; The first output module is connected to the first node, and the first node is used to charge to a first potential under the control of the j-2b-th level transmission signal output by the Jb-th scanning driving unit, so as to control the first output module to output the j-th level transmission signal and the j-th scanning signal, wherein 1<b<a<n, and a and b are integers.

2. The scanning driving circuit according to claim 1, characterized in that: The first signal output subunit also includes a first maintaining module, which is connected to the power supply voltage terminal and the second node, and is used to provide a power supply voltage to the second node to maintain the potential of the second node at the first potential before the second node receives the j-2b level transmission signal.

3. The scanning driving circuit according to claim 2, characterized in that: The first signal output subunit also includes a second pull-down control module, which is connected to the first node, the second node and the output end of the j-2a level transmission signal. The second pull-down control module outputs a second potential to the second node under the control of the j-2a level transmission signal to control the first pull-down control module to stop outputting the second potential to the first node.

4. The scanning driving circuit according to claim 3, characterized in that: The first signal output subunit further includes a first pull-up control module, which is connected to the output end of the j-2b-th level transmission signal, the DC power supply end and the first node, and is used to control the DC power supply to charge the first node to a first potential under the control of the j-2b-th level transmission signal; The first pull-down control module is also connected to the output end of the j+c-th level transmission signal, and is used to output a second potential to the first node under the control of the j+c-th level transmission signal, so as to control the first output module to stop outputting the j-th level transmission signal and the j-th scanning signal, where c is an integer greater than or equal to 1.

5. The scanning driving circuit according to claim 4, characterized in that: The first signal output subunit also includes a first pull-down module, which is connected to the second node, the output end of the j-th level transmission signal and the output end of the j-th scanning signal. When the second node is the first potential, the pull-down module outputs a second potential to the output end of the j-th level transmission signal and the output end of the j-th scanning signal.

6. The scanning driving circuit according to any one of claims 1 to 5, characterized in that: The J-th scan driving unit further includes a second signal output subunit for outputting a j+1-th level transmission signal and a j+1-th scan signal, wherein the second signal output subunit includes a third pull-down control module, a second output module, a third node and a fourth node; The third pull-down control module is connected to the third node and the fourth node, and the fourth node is used to output the second potential to the third pull-down control module under the control of the j-2a-th level transmission signal output by the Ja-th scan driving unit, so as to control the third pull-down control module to stop outputting the second potential to the third node; The second output module is connected to the third node, and the third node is used to charge to the first potential under the control of the j-2b+1th level transmission signal output by the Jbth scan driving unit, so as to control the second output module to output the j+1th level transmission signal and the j+1th scan signal.

7. The scanning driving circuit according to claim 6, characterized in that: The second signal output subunit also includes a second maintaining module, which is connected to the power supply voltage terminal and the fourth node, and is used to provide a power supply voltage to the fourth node to maintain the potential of the fourth node at the first potential before the fourth node receives the j-2b+1th level transmission signal.

8. The scanning driving circuit according to claim 7, characterized in that: The second signal output subunit also includes a fourth pull-down control module, which is connected to the j-2a-th level signal output terminal, the third node and the fourth node. The fourth pull-down control module outputs the second potential to the fourth node under the control of the j-2a-th level signal to control the third pull-down control module to stop outputting the second potential to the third node.

9. The scanning driving circuit according to claim 8, characterized in that: The second signal output subunit further includes a second pull-up control module, which is connected to the output end of the j-2b+1th level transmission signal, the DC power supply end and the third node, and is used to control the DC power supply to charge the third node to the first potential under the control of the j-2b+1th level transmission signal; The third pull-down control module is also connected to the output end of the j+c+1th level transmission signal, and is used to output a second potential to the third node under the control of the j+c+1th level transmission signal, so as to control the second output module to stop outputting the j+1th level transmission signal and the j+1th scanning signal.

10. A display panel, characterized in that: It includes a plurality of pixel units arranged in a matrix in a display area, a data driving circuit arranged in a non-display area, a timing control circuit and a scanning driving circuit as described in any one of claims 1 to 9, wherein the scanning driving circuit outputs a gate control signal output by the timing control circuit and cooperates with the data driving circuit to drive the pixel units to display images in accordance with a source output control signal output by the timing control circuit.

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