Scanning driving circuit and touch display panel

Abstract

The embodiment of the invention discloses a scanning driving circuit and a touch control display panel, the scanning driving circuit comprises a plurality of scanning driving units, the plurality of scanning driving units are used for sequentially outputting scanning signals to control a display area to carry out image display, and each scanning driving unit comprises a signal generation unit and a signal adjustment unit, the signal generating unit and the signal adjusting unit are electrically connected to the scanning signal output node, the signal generating unit is used for outputting a scanning signal of a first potential to the scanning signal output node, and the signal adjusting unit is used for adjusting the scanning signal of the first potential so as to control the scanning signal in at least two continuous time periods. The first potential is maintained in the first time period, and the second potential is maintained in the second time period, so that the coupling effect of the adjacent scanning lines on the first-row scanning line is reduced, and the coupling effect of the first-row scanning line on the common electrode is further reduced.

Description

Technical Field

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

[0002] With the increase of the Internet of Things, human-computer interaction is becoming more and more frequent, and the demand for screens with touch display is also increasing. In-cell touch technology (In-cell refers to the method of embedding touch panel functions into liquid crystal pixels) has been favored by the market due to its advantages such as narrow borders, IC (chip) integrated display and touch functions, reduced IC cost, reduced module thickness and mature process. Touch and Display Driver Integration (TDDI) is a commonly used method in In-cell touch technology. The principle of TDDI technology is usually self-capacitive touch, which divides the common electrode of the entire panel into multiple touch blocks, each touch block is connected to the touch wiring through a hole, and then connected to the ICtouch channel through the touch wiring.

[0003] However, in the current design, when the scan line transmits the scan signal to the pixel unit, it usually couples with the touch block, causing the common voltage to be pulled down, resulting in a change in the voltage difference between the pixel electrode and the common electrode in the pixel unit, which in turn causes horizontal stripes to appear on the touch panel when displaying images. Therefore, how to eliminate the horizontal stripes on the touch display panel is an urgent problem that needs to be solved. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present application proposes a touch display panel and a display device that can effectively eliminate horizontal stripes.

[0005] An embodiment of the present application provides a scan driving circuit, comprising a plurality of scan driving units, wherein the plurality of scan driving units are used to sequentially output scan signals to control a display area to display an image, wherein the scan driving units include a signal generating unit and a signal adjusting unit, wherein the signal generating unit and the signal adjusting unit are electrically connected to a scan signal output node, wherein the signal generating unit is used to output a scan signal of a first potential to the scan signal output node, and wherein the signal adjusting unit is used to adjust the scan signal of the first potential to control the scan signal to maintain a first potential in a first time period and a second potential in a second time period in at least two consecutive time periods, wherein the first potential is greater than the second potential.

[0006] Optionally, the signal generating unit is electrically connected to the i-th clock signal terminal, and the signal adjusting unit is electrically connected to the i+1-th clock signal terminal and the i+2-th clock signal terminal; the signal generating unit is used to output a scanning signal of a first potential based on the clock signal output by the i-th clock signal terminal, the signal adjusting unit pulls down the scanning signal to a second potential in a first time period based on the clock signal output by the i+1-th clock signal terminal, and the signal adjusting unit pulls up the scanning signal to the first potential in a second time period based on the clock signal output by the i+2-th clock signal terminal.

[0007] Optionally, the signal generating unit is electrically connected to the i-th clock signal terminal, and the signal adjustment unit is electrically connected to the i+1-th clock signal terminal, the i+2-th clock signal terminal, the i+3-th clock signal terminal and the i+4-th clock signal terminal; the signal generating unit is used to output a scanning signal of a first potential based on the clock signal output by the i-th clock signal terminal, and in four consecutive time periods, the signal adjustment unit pulls down the scanning signal to the second potential in the first time period based on the clock signal output by the i+1-th clock signal terminal, pulls up the scanning signal to the first potential in the second time period based on the clock signal output by the i+2-th clock signal terminal, pulls down the scanning signal to the second potential in the third time period based on the clock signal output by the i+3-th clock signal terminal, and pulls up the scanning signal to the first potential in the fourth time period based on the clock signal output by the i+4-th clock signal terminal.

[0008] Optionally, the signal adjustment unit includes a control module and a control node, the control module is electrically connected to the control node and the scan signal output node, and in the process of the signal generating unit outputting a scan signal of a first potential, when the control node is at the first potential, the control module controls the scan signal output node to output a scan signal of a second potential, and when the control node is at the second potential, the control module controls the scan signal output node to output a scan signal of a first potential, and the first potential is greater than the second potential.

[0009] Optionally, the signal adjustment unit further includes a first adjustment module, a second adjustment module, a third adjustment module and a fourth adjustment module, the first adjustment module being electrically connected to the control node, the i+1th clock signal terminal and the first voltage terminal, and being used to control the first voltage terminal to pull up the control node to the first potential in the second time period according to the clock signal output by the i+1th clock signal terminal, so as to control the control module to control the scan signal output node to output a scan signal of the second potential in the second time period; the second adjustment module being electrically connected to the control node, the i+2th clock signal terminal and the second voltage terminal, and being used to control the second voltage terminal to pull down the control node to the second potential in the third time period according to the clock signal output by the i+2th clock signal terminal, so as to control the control module to control the scan signal output node The output node outputs a scanning signal of a first potential in a third time period; the third adjustment module is electrically connected to the control node, the i+3th clock signal terminal and the first voltage terminal, and is used to control the first voltage terminal to pull up the control node to the first potential in a fourth time period according to the clock signal output by the i+3th clock signal terminal, so as to control the control module to control the scanning signal output node to output a scanning signal of a second potential in the fourth time period; the fourth adjustment module is electrically connected to the control node, the i+4th clock signal terminal and the second voltage terminal, and is used to control the second voltage terminal to pull down the control node to the second potential in the fifth time period according to the clock signal output by the i+4th clock signal terminal, so as to control the control module to control the scanning signal output node to output a scanning signal of a first potential in the fifth time period.

[0010] Optionally, the signal generating unit includes a pull-up module, an output module and a first node, the pull-up module is electrically connected to the input end, the power supply voltage end and the first node, and is used to receive the power supply voltage from the power supply voltage end under the control of the input end to pull up the first node to the first potential, the output module is electrically connected to the i-th clock signal end, the first node and the scan signal output node, and the output module outputs a scan signal of the first potential from the scan signal output node according to the clock signal output by the i-th clock signal end when the first node is the first potential.

[0011] Optionally, the signal generating unit also includes a maintaining module, a pull-down control module, a pull-down module and a second node. The maintaining module is electrically connected to the first voltage terminal, the pull-down module and the second node, and is used to receive a first level signal from the first voltage terminal and transmit it to the pull-down control module and the second node, so as to control the second node to maintain at the first potential; the pull-down control module is electrically connected to the first node, the second node and the second voltage terminal, and the pull-down control module controls the second voltage terminal to output a second level signal to the second node when the first node is at the first potential, so as to pull the second node down to the second potential, and the pull-down control module controls the second voltage terminal to stop outputting the second level signal to the second node when the first node is at the second potential, so as to control the second node to be pulled up to the first potential under the control of the maintaining module; the pull-down module is electrically connected to the second node, the scan signal output node and the second voltage terminal, and the pull-down module controls the scan signal output node to output a scan signal of the second potential when the second node is at the first potential, and the pull-down module controls the scan signal output node to output a scan signal of the first potential when the second node is at the second potential.

[0012] Optionally, the signal generating unit also includes a first reset module and a second reset module, the first reset module is electrically connected to the first reset control terminal, the low voltage terminal and the first node, and is used to connect the first node to the low voltage terminal under the control of the first reset control terminal, and is used to reset the first node to a preset potential; the second reset module is electrically connected to the scan signal output node, the output module, the second reset control terminal and the third reset control terminal, and is used to reset the scan signal output node and the output module to a preset potential under the control of the second reset control terminal and the third reset control terminal.

[0013] Optionally, the first adjustment module includes a first control tube, the second adjustment module includes a second control tube, the third adjustment module includes a third control tube, and the fourth adjustment module includes a fourth control tube; the control end of the first control tube is electrically connected to the i+1th clock signal end, the first conductive end of the first control tube is electrically connected to the first voltage end, and the second conductive end of the first control tube is electrically connected to the control node, and is used to be turned on under the control of the clock signal output from the i+1th clock signal end to control the first voltage end to output a first level signal to the control node, so as to pull the control node to the first potential; the control end of the second control tube is electrically connected to the i+2th clock signal end, the first conductive end of the second control tube is electrically connected to the control node, and the second conductive end of the second control tube is electrically connected to the second voltage end, and is used to be turned on under the control of the clock signal output from the i+2th clock signal end to control the second The voltage end outputs a second level signal to the control node, so as to pull the control node to the second potential; the control end of the third control tube is electrically connected to the i+3th clock signal end, the first conductive end of the third control tube is electrically connected to the first voltage end, and the second conductive end of the third control tube is electrically connected to the control node, and is used to be turned on under the control of the clock signal output from the i+3th clock signal end, so as to control the first voltage end to output the first level signal to the control node, so as to pull the control node to the first potential; the control end of the fourth control tube is electrically connected to the i+4th clock signal end, the first conductive end of the fourth control tube is electrically connected to the control node, and the second conductive end of the fourth control tube is electrically connected to the second voltage end, and is used to be turned on under the control of the clock signal output from the i+4th clock signal end, so as to control the second voltage end to output the second level signal to the control node, so as to pull the control node to the second potential.

[0014] Optionally, the control module includes a fifth control tube, the control tube of the fifth control tube is electrically connected to the control node, the first conductive end of the fifth control tube is electrically connected to the scan signal output node, and the second conductive end of the fifth control tube is electrically connected to the second voltage end; in the second time period, the control node controls the fifth control tube to be turned on, and the second voltage end outputs a second level signal to the scan signal output node to control the scan signal output node to output a scan signal of a second potential; in the third time period, the control node controls the fifth control tube to be turned off, and the second voltage end stops outputting the second level signal to the scan signal output node to control the scan signal output node to output a scan signal of a first potential; in the fourth time period, the control node controls the fifth control tube to be turned on, and the second voltage end outputs a second level signal to the scan signal output node to control the scan signal output node to output a scan signal of a second level signal.

[0015] An embodiment of the present application also provides a touch display panel, including pixel units arranged in an array, a data driving circuit and a scanning driving circuit as described above, wherein the scanning driving circuit is used to output the scanning signal to the pixel unit through a scanning line, and is used to control the pixel unit to receive the data signal from the data driving circuit through the data line, the pixel unit includes a pixel electrode and a common electrode, the pixel electrode and the common electrode perform image display according to the data signal during a display period within a frame of image display period, the common electrode is also used to detect touch operation during a touch period within a frame of image display period, and the display period and the touch period are continuous in time.

[0016] Compared with the problems in the prior art, the embodiments of the present application control each scanning signal in at least two consecutive time periods, controlling the scanning signal to be at a first potential in one time period and at a second potential in another time period, thereby reducing the coupling effect of adjacent scanning lines on the first row of scanning lines, thereby effectively reducing the coupling effect of the first row of scanning lines on the common electrode, and further reducing the coupling difference between the first row of scanning lines and the middle row of scanning lines on the common electrode, thereby eliminating the horizontal stripe phenomenon during image display. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 A schematic diagram of the structure of a display device provided in an embodiment of the present application; Figure 2 for Figure 1 A schematic diagram of the planar layout of the touch display panel; Figure 3 is a schematic diagram of the planar layout of the common electrode; Figure 4 A schematic diagram of time-sharing driving of touch and display of a touch display panel; Figure 5 for Figure 2 Mid scan signal output timing diagram; Figure 6 A schematic diagram of a circuit architecture of a scan driving circuit provided in an embodiment of the present application; Figure 7 for Figure 6 Schematic diagram of equivalent circuit of scanning driving unit; Figure 8 for Figure 7 Schematic diagram of the output waveform of the mid-scan signal; Fig. 9 Schematic diagram of waveforms of multiple scanning signals output sequentially.

[0019] Reference numerals: Display device 100, touch display panel 10, power module 30, display area 10a, array substrate 10c, first direction F1, second direction F2, timing control circuit 11, data driving circuit 12, scan driving circuit 20, m data lines S1~Sm, n scan lines G1~Gn, pixel unit P, common electrode Vcom, first period t1, second period t2, third period t3, fourth period t4, fifth period t5, sixth period t6, first clock signal terminal to sixth clock signal terminal CLK1~C LK6, start signal-STV, scan drive unit-20a, signal generating unit-21, signal adjusting unit-22, pull-up module-211, output module-212, maintain module-213, pull-down control module-214, pull-down module-215, first reset module-216, second reset module-217, first adjustment module-221, second adjustment module-222, third adjustment module-223, fourth adjustment module-224, control module-225, control node-QT, first capacitor-C1, first switch tube-T1, second switch tube-T2, third switch the first control transistor - CT1, the second control transistor - CT2, the third control transistor - CT3, the fourth control transistor - CT4, the fifth control transistor - CT5, the i-th clock signal terminal - CLKi, the i+1-th clock signal terminal - CLKi+1, the i+2-th clock signal terminal - CLKi+2, the i+3-th clock signal terminal - CLKi+3, the i+4-th clock signal terminal - CLKi+4, the i+5-th clock signal terminal - CLKi+5, the i+6-th clock signal terminal - CLKi+6, the i+7-th clock signal terminal - CLKi+7, the i+8-th clock signal terminal - CLKi+8, the i+9-th clock signal terminal - CLKi+9, the i+10-th clock signal terminal - CLKi+1, the i+11-th clock signal terminal - CLKi+1 Terminal-CLKi+4, i-th scan line-Gi, i+1-th scan line-Gi+1, i+2-th scan line-Gi+2, i+3-th scan line-Gi+3, i+4-th scan line-Gi+4, i+5-th scan line-Gi+5, i+6-th scan line-Gi+6, input terminal-IN, power supply voltage terminal-VDD, first node-Q1, second node-Q2, scan signal output node-OUT, first voltage terminal-VGH, second voltage terminal-VGL, first reset control terminal-R1, second reset control terminal-R2, third reset control terminal-R3, low voltage terminal-VSS. DETAILED DESCRIPTION

[0020] 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.

[0021] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be implemented. 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a display device provided in an embodiment of the present application. Figure 1 As shown, the display device 100 includes a touch display panel 10 and a power module 30, and the power module 30 is arranged on the back of the touch display panel 10, that is, the non-display surface of the touch display panel 10. The power module 30 is used to provide a power supply voltage for the touch display panel 10 to display images. In the embodiment of the present application, the display device 100 can be a portable electronic device, such as a mobile phone, a tablet computer, etc.

[0026] See also Figure 2 , Figure 2 for Figure 1 Schematic diagram of the planar layout of the touch display panel.

[0027] like Figure 2 As shown, the touch display panel 10 includes a display area 10 a , and the display area 10 a is provided with a plurality of pixel units arranged in an array, m data lines S1 -Sm, and n scan lines G1 -Gn, where m and n are natural numbers greater than 1.

[0028] The n scan lines G1-Gn extend along the first direction F1 and are insulated from each other and arranged in parallel along the second direction F2. The m data lines S1-Sm extend along the second direction F2 and are insulated from each other and arranged in parallel along the first direction F1. The first direction F1 is perpendicular to the second direction F2.

[0029] In the non-display area of ​​the touch display panel 10 , the display device 100 is further provided with a timing control circuit 11 , a data driving circuit 12 and a scanning driving circuit 20 for driving the pixel units to display images.

[0030] Among them, the timing control circuit 11 is electrically connected to the data driving circuit 12 and the scan driving circuit 20, and is used to control the working timing of the data driving circuit 12 and the scan driving circuit 20, that is, outputting corresponding timing control signals to the data driving circuit 12 to the scan driving circuit 20 to control when to output corresponding scan signals and data signals.

[0031] The data driving circuit 12 is electrically connected to the m data lines S1-Sm, and is used to transmit the data signal (Data) to be displayed to the plurality of pixel units P in the form of data voltage through the m data lines S1-Sm. The pixel unit P transmits the received data signal to the pixel electrode (not marked) to control the pixel electrode and the common electrode ( Figure 3 ) to form a voltage difference, thereby driving the display medium (liquid crystal molecules in this embodiment) to rotate, so as to emit light to display images.

[0032] The scan driving circuit 20 is used to be electrically connected to the n scan lines G1-Gn, and is used to output scan signals through the n scan lines G1-Gn for controlling when the pixel unit P receives the data signal. The scan driving circuit 20 outputs scan signals from the n scan lines G1-Gn in sequence according to the scan cycle.

[0033] In this embodiment, the circuit elements in the scan driving circuit 20 and the pixel units P in the array substrate 10 c are manufactured in the array substrate 10 c in the same process, which is also the GOA (Gate Driver on Array) technology.

[0034] Please also read Figure 3 , Figure 4 and Figure 5 , Figure 3 is a schematic diagram of the planar layout of the common electrode, Figure 4 The schematic diagram of time-sharing driving of touch and display of touch display panel is shown in FIG. Figure 5 for Figure 2 Mid scan signal output timing diagram.

[0035] like Figure 3 , Figure 4 and Figure 5 As shown, the touch display panel 10 includes a plurality of common electrodes Vcom arranged in an array, and the plurality of common electrodes Vcom are driven and displayed by a time-sharing driving method. The specific driving display method is that the touch display panel 10 includes a plurality of display scanning periods that are continuous in time during the touch display process. As shown in the figure, the a-th frame display scanning period and the a+1-th frame display scanning period are any two adjacent frame display scanning periods of the plurality of frame display scanning periods, where a is an integer greater than or equal to 1. Each frame display scanning period includes a display period and a touch period. During the display period, each common electrode Vcom inputs a common voltage, and the pixel electrode in the pixel unit P forms a voltage difference with the common voltage in the common electrode Vcom according to the data signal to drive the display medium to display an image. During the touch period, each common electrode Vcom is used as a touch electrode to input a touch signal for sensing a touch command.

[0036] Among them, in the display period of a frame of image, n scanning lines G1~Gn output scanning signals in sequence. When transmitting the scanning signals, the scanning lines will be coupled with each other, and then coupled with the common electrode Vcom, resulting in a change in the common voltage on the common electrode. When the scanning line extends along the first direction F1 and is located in the middle position of each common electrode Vcom, that is, the scanning line covered by the common electrode Vcom, the coupling effects of the two upper and lower adjacent scanning lines on each scanning line can offset each other, thereby eliminating the coupling effect on the common electrode Vcom. However, the coupling effect on the scanning line at the edge position of the common electrode Vcom cannot be offset, thereby further increasing the coupling effect on the common electrode Vcom, resulting in a voltage change on the common electrode Vcom.

[0037] For example, the second scan line G2, the third scan line G3 and the fourth scan line G4 extend along the first direction F1 and are located in the middle position of the common electrode Vcom, that is, in the thickness direction of the array substrate 10c, the common electrode Vcom covers the second scan line G2, the third scan line G3 and the fourth scan line G4, wherein, in the process of the third scan line G3 outputting the scan signal, the falling edge of the second scan signal has a downward coupling effect on the third scan signal, causing the voltage of the third scan signal to decrease, and the rising edge of the fourth scan signal has an upward coupling effect on the third scan signal, causing the voltage of the third scan signal to increase, thereby offsetting the upward coupling effect of the second scan signal, so that the coupling effect of the third scan line G3 on the common electrode Vcom is smaller. Similarly, the coupling effect of other scan lines set in the middle position on the common electrode Vcom is also smaller.

[0038] The first scan line G1 is located at the edge of the common electrode Vcom. When the first scan line outputs the scan signal, the second scan line G2 to the sixth scan line G6 sequentially output the second scan signal to the sixth scan signal, wherein the rising edges of the second scan signal to the sixth scan signal have an upward coupling effect on the first scan signal, resulting in the accumulation of the coupling effect on the first scan signal and the inability to offset it, thereby causing the first scan signal to be subjected to a greater upward coupling effect, resulting in an increase in the voltage of the first scan signal, thereby increasing the coupling effect of the first scan line G1 on the common electrode Vcom, resulting in the voltage of the common electrode Vcom at the corresponding position of the first scan line G1 being different from the voltage of the common electrode Vcom at the corresponding position of the second scan line G2 to the sixth scan line G6, thereby causing horizontal stripes to appear when the display panel displays images.

[0039] Based on this, the present application provides a scan driving circuit, which adjusts the scan signal to eliminate the horizontal stripe phenomenon in the image display caused by the coupling between the scan line and the common electrode Vcom.

[0040] See also Figure 6, Figure 6 A schematic diagram of a circuit architecture of a scan driving circuit provided in an embodiment of the present application.

[0041] like Figure 6 As shown, the scan driving circuit 20 includes multiple cascaded scan driving units 20a, and the scan driving circuit 20 includes n cascaded scan driving units 20a, six clock signal terminals (a first clock signal terminal CLK1 to a sixth clock signal terminal CLK6), a start signal STV, a reset signal R, and a low voltage terminal VSS, where n is an integer greater than or equal to 1.

[0042] In the scan driving circuit 20 , each scan driving unit outputs a scan signal to a scan line in the display area 10 a . During the display of one frame of an image, n scan driving units sequentially output n scan signals to n scan lines G1 -Gn.

[0043] The six clock signal terminals CLK1-CLK6 are used to output six clock signals respectively to control the n scan driving units 20a to output scan signals in sequence. The start signal STV is the start-up signal of the first scan driving unit 20a, and the other scan driving units use the stage transmission signal output by the cascade scan unit as the start signal. The low voltage terminal VSS is used to provide a low voltage for the nodes in the scan driving unit.

[0044] In an exemplary embodiment, the clock signal may be set to other numbers according to specific needs, for example, it may be set to 2, 4, 8, etc., and the present application does not impose any limitation on this.

[0045] See also Figure 7 , Figure 7 for Figure 6 Schematic diagram of the equivalent circuit of the scan drive unit.

[0046] like Figure 7 As shown, the scan driving unit 20a includes a signal generating unit 21 and a signal adjusting unit 22, wherein the signal generating unit 21 is electrically connected to the signal adjusting unit 22, the input terminal IN, the i-th clock signal terminal CLKi and the scan signal output node OUT, and is used to output a scan signal of a first potential to the scan signal output node OUT under the control of a clock signal input from the i-th clock signal terminal CLKi according to a control signal input from the input terminal IN, wherein i is an integer greater than or equal to 1. The signal adjusting unit 22 is used to control the scan signal to be maintained at a first potential in a first time period and maintained at a second potential in a second time period in at least two consecutive time periods.

[0047] When the scanning signal is adjusted within two consecutive time periods, the signal adjustment unit 22 is electrically connected to the i+1th clock signal terminal CLKi+1 and the i+2th clock signal terminal CLKi+2, and is used to adjust the scanning signal of the first potential under the control of the clock signal output by the i+1th clock signal terminal CLKi+1 and the i+2th clock signal terminal CLKi+2, so as to control the scanning signal to be at the first potential in the first time period and at the second potential in the second time period.

[0048] In another embodiment, the scanning signal can also be adjusted in four consecutive time periods. At this time, the signal adjustment unit 22 is electrically connected to the i+1th clock signal terminal CLKi+1, the i+2nd clock signal terminal CLKi+2, the i+3rd clock signal terminal CLKi+3 and the i+4th clock signal terminal CLKi+4, and is used to adjust the scanning signal of the first potential under the control of the clock signal output by the i+1th clock signal terminal CLKi+1, the i+2nd clock signal terminal CLKi+2, the i+3rd clock signal terminal CLKi+3 and the i+4th clock signal terminal CLKi+4, so as to control the scanning signal to maintain at the first potential in the first and third time periods of four consecutive time periods, and to maintain at the second potential in the second and fourth time periods, wherein the first potential is greater than the second potential.

[0049] By controlling each scanning signal in at least two consecutive time periods, the scanning signal is controlled to be at the first potential in one time period and at the second potential in another time period, thereby reducing the coupling effect of the adjacent scanning lines on the first scanning line, thereby effectively reducing the coupling effect of the first scanning line on the common electrode Vcom, thereby reducing the coupling difference between the first scanning line and the middle scanning line on the common electrode, and eliminating the horizontal stripe phenomenon during image display.

[0050] The signal generating unit 21 includes a pull-up module 211, an output module 212 and a first node Q1. The pull-up module 211 is electrically connected to the input terminal IN, the power supply voltage terminal VDD and the first node Q1, and is used to receive the power supply voltage from the power supply voltage terminal VDD under the control of the input terminal IN to pull up the first node Q1 to the first potential. The output module 212 is electrically connected to the i-th clock signal terminal CLKi, the first node Q1 and the scan signal output node OUT. When the first node Q1 is at the first potential, the output module outputs a scan signal of the first potential from the scan signal output node OUT according to the clock signal output by the i-th clock signal terminal CLKi. The scan signal output node OUT is connected to the i-th scan line Gi, that is, the scan signal output by the scan signal output node OUT is transmitted to the i-th scan line Gi.

[0051] The signal generating unit 21 also includes a maintaining module 213, a pull-down control module 214, a pull-down module 215 and a second node Q2, wherein the maintaining module 213 is electrically connected to the first voltage terminal VGH, the pull-down control module 214, the second node Q2 and is electrically connected to the pull-down module 215 via the second node Q2, and the maintaining module 213 is used to receive a first level signal from the first voltage terminal VGH and transmit it to the pull-down control module 214 and the second node Q2, and is used to control the second node Q2 to maintain a first potential.

[0052] The pull-down control module 214 is electrically connected to the first node Q1, the second node Q2 and the second voltage terminal VGL. When the first node Q1 is at the first potential, the pull-down control module 214 controls the second voltage terminal VGL to output a second level signal to the second node Q2 to pull the second node Q2 from the first potential to the second potential. When the first node Q1 is at the second potential, the pull-down control module 214 controls the second voltage terminal VGL to stop outputting the second level signal to the second node Q2, so that the second node Q2 is pulled up to the first potential under the control of the maintenance module 213.

[0053] The pull-down module 215 is electrically connected to the second node Q2, the scan signal output node OUT and the second voltage terminal VGL. When the second node Q2 is at the first potential, the pull-down module 215 outputs a second level signal to the scan signal output node OUT according to the second voltage terminal to control the scan signal output node OUT to stop outputting the scan signal, or output the scan signal of the second potential. When the second node Q2 is at the second potential, the pull-down module 215 stops outputting the second level signal to the scan signal output node OUT, so that the output module 212 can output the scan signal of the first potential through the scan signal output node OUT. The scan signal of the first potential is a high level signal, and the scan signal of the second potential is a low level signal.

[0054] The signal generating unit 21 further includes a first reset module 216 and a second reset module 217. The first reset module 216 is electrically connected to the first reset control terminal R1, the low voltage terminal VSS and the first node Q1, and is used to connect the first node Q1 to the low voltage terminal VSS under the control of the first reset control terminal R1, and is used to reset the first node Q1 to a preset potential to eliminate the residual charge in the first node Q1. The second reset module 217 is electrically connected to the scan signal output node OUT, the output module 212, the second reset control terminal R2 and the third reset control terminal R3, and is used to reset the scan signal output node and the output module 212 to a preset potential under the control of the second reset control terminal R2 and the third reset control terminal R3 to eliminate the residual charge in the scan signal output node OUT and the output module 212.

[0055] Specifically, the pull-up module 211 includes a first switch tube T1, and the output module 212 includes a second switch tube T2 and a first capacitor C1. The control end of the first switch tube T1 is electrically connected to the input end IN, the first conductive end of the first switch tube T1 is electrically connected to the power supply voltage end VDD, and the second conductive end of the first switch tube T1 is electrically connected to the first node Q1. The first switch tube T1 is used to be turned on under the control of the input end to control the power supply voltage end VDD to charge the first node Q1, and to pull up the first node Q1 to the first potential. The control end of the second switch tube T2 is electrically connected to the first node Q1, the first conductive end of the second switch tube T2 is electrically connected to the i-th clock signal end CLKi, and the second conductive end of the second switch tube T2 is electrically connected to the scan signal output node OUT. The second switch tube T2 is used to be turned on when the first node Q1 is at the first potential, and the clock signal is output from the scan signal output node OUT as the scan signal. At this time, the scan signal output node OUT outputs the scan signal of the first potential. The first end of the first capacitor C1 is electrically connected to the control end of the second switch tube T2, and the second end of the first capacitor C1 is electrically connected to the second conductive end of the second switch tube T2. The first capacitor C1 is used to maintain the voltage stability when the scan signal output node OUT outputs the scan signal.

[0056] The maintaining module 213 includes a third switch tube T3 and a fourth switch tube T4, wherein the control end and the first conductive end of the third switch tube T3 are electrically connected to the first voltage end VGH, the second conductive end of the third switch tube T3 is electrically connected to the pull-down control module 214, the control end of the fourth switch tube T4 is electrically connected to the second conductive end of the third switch tube T3, the first conductive end of the fourth switch tube T4 is electrically connected to the first voltage end VGH, and the second conductive end of the fourth switch tube T4 is electrically connected to the second node Q2. The third switch tube T3 is used to be turned on under the control of the first level signal output by the first voltage end VGH, so as to transmit the first level signal output by the first voltage end VGH to the control end of the fourth switch tube T4, and the fourth switch tube T4 is used to be turned on under the control of the first level signal, and the first voltage end VGH controls the second node Q2 to be maintained at the first potential through the fourth switch tube T4.

[0057] The pull-down control module 214 includes a fifth switch tube T5 and a sixth switch tube T6, wherein the control end of the fifth switch tube T5 is electrically connected to the first node Q1, the first conductive end of the fifth switch tube T5 is electrically connected to the second conductive end of the third switch tube T3 and the control end of the fourth switch tube T4, and the second conductive end of the fifth switch tube T5 is electrically connected to the second voltage end VGL. The control end of the sixth switch tube T6 is electrically connected to the first node Q1, the first conductive end of the sixth switch tube T6 is electrically connected to the second node Q2, and the second conductive end of the sixth switch tube T6 is electrically connected to the second voltage end VGL. When the first node Q1 is at the first potential, the fifth switch tube T5 and the sixth switch tube T6 are turned on, the fifth switch tube T5 is used to control the second conductive end of the third switch tube T3, and the control end of the fourth switch tube T4 is electrically connected to the second voltage end VGL to control the fourth switch tube T4 to receive the second level signal, and to control the fourth switch tube T4 to be turned off, so that the second node Q2 stops receiving the first level signal from the first voltage end VGH.

[0058] The pull-down module 215 further includes a seventh switch tube T7 and an eighth switch tube T8, wherein the control end of the seventh switch tube T7 is electrically connected to the second node Q2, the first conductive end of the seventh switch tube T7 is electrically connected to the first node Q1, the second conductive end of the seventh switch tube T7 is electrically connected to the second voltage end VGL, the control end of the eighth switch tube T8 is electrically connected to the second node Q2, the first conductive end of the eighth switch tube T8 is electrically connected to the scan signal output node OUT, and the second conductive end of the eighth switch tube T8 is electrically connected to the second voltage end VGL. When the second node Q2 is at the first potential, the seventh switch tube T7 and the eighth switch tube T8 are turned on, the seventh switch tube T7 is used to pull down the first node Q1 to the second potential under the control of the second node Q2, and the eighth switch tube T8 is used to pull down the scan signal output node OUT to the second potential under the control of the second node Q2, that is, to control the scan signal output node OUT to output the scan signal of the second potential, or to stop outputting the scan signal.

[0059] The first reset module 216 includes a ninth switch tube T9, a control end of the ninth switch tube T9 is electrically connected to the first reset control end R1, a first conductive end of the ninth switch tube T9 is electrically connected to the first node Q1, and a second conductive end of the ninth switch tube T9 is electrically connected to the low voltage end VSS. The ninth switch tube T9 is used to be turned on when the reset control end R outputs a reset signal to control the low voltage end VSS to be electrically connected to the first node Q1, so as to pull the first node Q1 down to the second potential.

[0060] The second reset module 217 includes a tenth switch tube T10 and an eleventh switch tube T11, wherein the control end of the tenth switch tube T10 is electrically connected to the second reset control end R2, the first conductive end of the tenth switch tube T10 is electrically connected to the first end of the first capacitor C1 and the first node Q1, and the second conductive end of the tenth switch tube T10 is electrically connected to the second voltage end VGL. The tenth switch tube T10 is used to be turned on under the control of the reset signal output by the second reset control end R2, so as to control the second voltage end VGL to output a second level signal to the first capacitor C1 and the first node Q1, so as to reset the first capacitor C1 and the first node Q1, so as to clear the residual charge in the first capacitor C1.

[0061] The control end of the eleventh switch tube T11 is electrically connected to the third reset control end R3, and the first conductive end of the eleventh switch tube T11 is electrically connected to the scan signal output node OUT and the second end of the first capacitor C1. The eleventh switch tube T11 is used to be turned on under the control of the third reset control end R3 to control the second voltage end VGL to output the second level signal to the scan signal output node OUT and the first capacitor C1, and to reset the scan signal output node OUT and the first capacitor C1 to clear the residual charge in the scan signal output node OUT.

[0062] Taking adjusting the scanning signal in four consecutive time periods as an example, the signal adjustment unit 22 includes a first adjustment module 221 , a second adjustment module 222 , a third adjustment module 223 , a fourth adjustment module 224 , a control module 225 and a control node QT.

[0063] Among them, the first adjustment module 221 is electrically connected to the control node QT, the i+1th clock signal terminal CLKi+1 and the first voltage terminal VGH. The first adjustment module 221 is used to control the first voltage terminal VGH to pull up the control node QT to the first potential in the second time period according to the clock signal output by the i+1th clock signal terminal CLKi+1.

[0064] The second adjustment module 222 is electrically connected to the control node QT, the i+2th clock signal terminal CLKi+2 and the second voltage terminal VGL. The second adjustment module 222 is used to control the second voltage terminal VGL to pull down the control node QT to the second potential in the third period according to the clock signal output by the i+2th clock signal terminal CLKi+2.

[0065] The third adjustment module 223 is electrically connected to the control node QT, the i+3th clock signal terminal CLKi+3 and the first voltage terminal VGH. The third adjustment module 223 is used to control the first voltage terminal VGH to pull up the control node QT to the first potential in the fourth period according to the clock signal output by the i+3th clock signal terminal CLKi+3.

[0066] The fourth adjustment module 224 is electrically connected to the control node QT, the i+4th clock signal terminal CLKi+4 and the second voltage terminal VGL. The fourth adjustment module 224 is used to control the second voltage terminal VGL to pull down the control node QT to the second potential in the fifth period according to the clock signal output by the i+4th clock signal terminal CLKi+4.

[0067] The control module 225 is electrically connected to the control node QT, the scan signal output node OUT and the second voltage terminal VGL. When the control node QT is at the first potential, the control module 225 controls the second voltage terminal VGL to be electrically connected to the scan signal output node OUT, and is used to pull down the scan signal output node OUT to the second potential, that is, to control the scan signal output node OUT to output the scan signal of the second potential in the second time period and the fourth time period. When the control node QT is at the second potential, the control module 225 controls the second voltage terminal VGL to be electrically disconnected from the scan signal output node OUT, so that the scan signal output node OUT outputs the scan signal of the first potential in the first time period, the third time period, and the fifth time period.

[0068] The first adjustment module 221 includes a first control tube CT1, a control end of the first control tube CT1 is electrically connected to the i+1th clock signal end CLKi+1, a first conductive end of the first control tube CT1 is electrically connected to the first voltage end, and a second conductive end of the first control tube CT1 is electrically connected to the control node QT. The first control tube CT1 is used to be turned on under the control of the clock signal output by the i+1th clock signal end CLKi+1, so as to control the first voltage end VGH to output a first level signal to the control node QT.

[0069] The second adjustment module 222 includes a second control tube CT2, the control tube of the second control tube CT2 is electrically connected to the i+2 clock signal terminal CLKi+2, the first conductive end of the second control tube CT2 is electrically connected to the control node QT, and the second conductive end of the second control tube CT2 is electrically connected to the second voltage terminal VGL. The second control tube CT2 is used to be turned on under the control of the clock signal output by the i+2 clock signal terminal CLKi+2, so as to control the second voltage terminal VGL to output a second level signal to the control node QT.

[0070] The third adjustment module 223 includes a third control tube CT3, a control end of the third control tube CT3 is electrically connected to the i+3th clock signal end CLKi+3, a first conductive end of the third control tube CT3 is electrically connected to the first voltage end VGH, and a second conductive end of the third control tube CT3 is electrically connected to the control node QT. The third control tube CT3 is used to be turned on under the control of the clock signal output by the i+3th clock signal end CLKi+3, so as to control the first voltage end VGH to output a first level signal to the control node QT.

[0071] The fourth adjustment module 224 includes a fourth control tube CT4, the control tube of the fourth control tube CT4 is electrically connected to the i+4th clock signal terminal CLKi+4, the first conductive end of the fourth control tube CT4 is electrically connected to the control node QT, and the second conductive end of the fourth control tube CT4 is electrically connected to the second voltage terminal VGL. The fourth control tube CT4 is used to be turned on under the control of the clock signal output by the i+4th clock signal terminal CLKi+4, so as to control the second voltage terminal VGL to output a second level signal to the control node QT.

[0072] The control module 225 includes a fifth control tube CT5, a control end of the fifth control tube CT5 is electrically connected to the control node QT, a first conductive end of the fifth control tube CT5 is electrically connected to the scan signal output node OUT, and a second conductive end of the fifth control tube CT5 is electrically connected to the second voltage end VGL. The fifth control tube CT5 is used to be turned on when the control node QT is at a first potential, and the second voltage end VGL outputs a second level signal through the scan signal output node OUT, and is used to be turned off when the control node QT is at a second potential, so that the second voltage end VGL stops outputting the second level signal to the scan signal output node OUT.

[0073] It can be understood that when the scanning signal is adjusted in two consecutive time periods, the signal adjustment unit 22 only needs to set the first adjustment module 221, the second adjustment module 222, the control module 225 and the control node QT. Its specific circuit architecture and connection method are the same as the above embodiment, and this embodiment will not be repeated here.

[0074] Please also read Figure 8 and Fig. 9 , Figure 8 for Figure 7 Schematic diagram of the output waveform of the scanning signal. Fig. 9 Schematic diagram of waveforms of multiple scanning signals output sequentially.

[0075] like Figure 8 As shown, taking the adjustment of the i-th scanning signal in four consecutive time periods as an example, the scanning driving unit 20a outputs the i-th scanning signal including six consecutive time periods, in the first time period t1, the scanning signal output node OUT outputs the scanning signal of the first potential, in the second time period t2, the scanning signal output node OUT outputs the scanning signal of the second potential, in the third time period t3, the scanning signal output node OUT outputs the scanning signal of the first potential, in the fourth time period t4, the scanning signal output node OUT outputs the scanning signal of the second potential, in the fifth time period t5, the scanning signal output node OUT outputs the scanning signal of the first potential, and in the sixth time period t6, the scanning signal output node OUT outputs the scanning signal of the first potential. Wherein, 1≤i≤n.

[0076] like Fig. 9As shown, taking the i-th scan line Gi as the first row of scan lines covered by one of the common electrodes Vcom as an example, the i-th scan line Gi completes the output of the i-th scan signal through the first time period t1 to the sixth time period t6. During the output of the i-th scan signal, the coupling effects of the rising edge and the falling edge of the scan signal output by the i+1-th scan line Gi+1 at the beginning and end of the second time period t2 on the i-th scan signal cancel each other, the coupling effects of the rising edge and the falling edge at the beginning and end of the fourth time period t4 on the i-th scan signal cancel each other, and the coupling effect of the rising edge on the i-th scan signal at the initial moment of the sixth time period t6 is not canceled, thereby having an upward coupling effect on the i-th scan signal.

[0077] Similarly, the scanning signal output by the i+2 scanning line Gi+2 is not offset at the rising edge at the end of the sixth period t6, thereby having an upward coupling effect on the i scanning signal. The scanning signal output by the i+4 scanning line Gi+4 is not offset at the rising edge at the end of the sixth period t6, thereby having an upward coupling effect on the i scanning signal. The scanning signal output by the i+6 scanning line Gi+6 is not offset at the rising edge at the end of the sixth period t6, thereby having an upward coupling effect on the i scanning signal.

[0078] The coupling effects of the rising edge and the falling edge of the scanning signal output by the i+3 scanning line Gi+3 at the beginning and end of the fourth time period t4 on the i scanning signal are mutually offset, and the coupling effects of the rising edge and the falling edge at the beginning and end of the sixth time period t6 on the i scanning signal are mutually offset, so that there is no upward or downward coupling effect on the i scanning signal. The coupling effects of the rising edge and the falling edge of the scanning signal output by the i+5 scanning line Gi+5 at the beginning and end of the sixth time period t6 on the i scanning signal are mutually offset, so that there is no upward or downward coupling effect on the i scanning signal.

[0079] Therefore, by adjusting the scan signal in the embodiment of the present application, the coupling effect of multiple scan lines covered by the same common electrode Vcom on the first row of scan lines is reduced, thereby reducing the coupling effect of the first row of scan lines on the common electrode Vcom, thereby weakening or eliminating the horizontal stripe phenomenon during image display.

[0080] 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 a plurality of scan driving units, wherein the plurality of scan driving units are used to sequentially output scan signals to control a display area to display an image, wherein: The scan driving unit includes a signal generating unit and a signal adjusting unit, the signal generating unit and the signal adjusting unit are electrically connected to a scan signal output node, the signal generating unit is used to output a scan signal of a first potential to the scan signal output node, and the signal adjusting unit is used to adjust the scan signal of the first potential to control the scan signal to maintain the first potential in a first time period and the second potential in a second time period in at least two consecutive time periods, wherein the first potential is greater than the second potential.

2. The scanning driving circuit according to claim 1, characterized in that: The signal generating unit is electrically connected to the i-th clock signal terminal, and the signal adjusting unit is electrically connected to the i+1-th clock signal terminal and the i+2-th clock signal terminal; The signal generating unit is used to output a scanning signal of the first potential according to the clock signal outputted by the i-th clock signal terminal, the signal adjusting unit pulls down the scanning signal to the second potential in the first time period according to the clock signal outputted by the i+1-th clock signal terminal, and the signal adjusting unit pulls up the scanning signal to the first potential in the second time period according to the clock signal outputted by the i+2-th clock signal terminal.

3. The scanning driving circuit according to claim 1, characterized in that: The signal generating unit is electrically connected to the i-th clock signal terminal, and the signal adjusting unit is electrically connected to the i+1-th clock signal terminal, the i+2-th clock signal terminal, the i+3-th clock signal terminal and the i+4-th clock signal terminal; The signal generating unit is used to output a scanning signal of the first potential according to the clock signal output by the i-th clock signal end. In four consecutive time periods, the signal adjusting unit pulls down the scanning signal to the second potential in the first time period according to the clock signal output by the i+1-th clock signal end, pulls up the scanning signal to the first potential in the second time period according to the clock signal output by the i+2-th clock signal end, pulls down the scanning signal to the second potential in the third time period according to the clock signal output by the i+3-th clock signal end, and pulls up the scanning signal to the first potential in the fourth time period according to the clock signal output by the i+4-th clock signal end.

4. The scanning driving circuit according to claim 3, characterized in that: The signal adjustment unit includes a control module and a control node, the control module is electrically connected to the control node and the scan signal output node, and in the process of the signal generating unit outputting the scan signal of the first potential, when the control node is at the first potential, the control module controls the scan signal output node to output the scan signal of the second potential, and when the control node is at the second potential, the control module controls the scan signal output node to output the scan signal of the first potential, and the first potential is greater than the second potential.

5. The scanning driving circuit according to claim 4, characterized in that: The signal adjustment unit further includes a first adjustment module, a second adjustment module, a third adjustment module and a fourth adjustment module, wherein the first adjustment module is electrically connected to the control node, the (i+1)th clock signal terminal and the first voltage terminal, and is used to control the first voltage terminal to pull up the control node to the first potential in the second time period according to the clock signal output by the (i+1)th clock signal terminal, so as to control the control module to control the scan signal output node to output the scan signal of the second potential in the second time period; The second adjustment module is electrically connected to the control node, the (i+2)th clock signal terminal and the second voltage terminal, and is used to control the second voltage terminal to pull down the control node to the second potential in the third time period according to the clock signal output by the (i+2)th clock signal terminal, so as to control the control module to control the scan signal output node to output the scan signal of the first potential in the third time period; The third adjustment module is electrically connected to the control node, the (i+3)th clock signal terminal and the first voltage terminal, and is used to control the first voltage terminal to pull up the control node to the first potential in the fourth time period according to the clock signal output by the (i+3)th clock signal terminal, so as to control the control module to control the scan signal output node to output the scan signal of the second potential in the fourth time period; The fourth adjustment module is electrically connected to the control node, the i+4th clock signal terminal and the second voltage terminal, and is used to control the second voltage terminal to pull down the control node to the second potential in the fifth time period according to the clock signal output by the i+4th clock signal terminal, so as to control the control module to control the scan signal output node to output the scan signal of the first potential in the fifth time period.

6. The scanning driving circuit according to claim 3, characterized in that: The signal generating unit includes a pull-up module, an output module and a first node. The pull-up module is electrically connected to an input terminal, a power supply voltage terminal and the first node, and is used to receive a power supply voltage from the power supply voltage terminal under the control of the input terminal to pull up the first node to a first potential. The output module is electrically connected to the i-th clock signal terminal, the first node and the scan signal output node. When the first node is at the first potential, the output module outputs a scan signal of the first potential from the scan signal output node according to a clock signal output by the i-th clock signal terminal.

7. The scanning driving circuit according to claim 6, characterized in that: The signal generating unit further comprises a maintaining module, a pull-down control module, a pull-down module and a second node, wherein the maintaining module is electrically connected to the first voltage terminal, the pull-down module and the second node, and is used to receive a first level signal from the first voltage terminal and transmit it to the pull-down control module and the second node, and is used to control the second node to maintain at a first potential; The pull-down control module is electrically connected to the first node, the second node, and the second voltage terminal. When the first node is at the first potential, the pull-down control module controls the second voltage terminal to output a second level signal to the second node, so as to pull the second node down to the second potential. When the first node is at the second potential, the pull-down control module controls the second voltage terminal to stop outputting the second level signal to the second node, so as to control the second node to be pulled up to the first potential under the control of the maintaining module. The pull-down module is electrically connected to the second node, the scan signal output node and the second voltage end. When the second node is at the first potential, the pull-down module controls the scan signal output node to output a scan signal of the second potential. When the second node is at the second potential, the pull-down module controls the scan signal output node to output a scan signal of the first potential.

8. The scanning driving circuit according to claim 7, characterized in that: The signal generating unit further includes a first reset module and a second reset module, wherein the first reset module is electrically connected to the first reset control terminal, the low voltage terminal and the first node, and is used to connect the first node to the low voltage terminal under the control of the first reset control terminal, and is used to reset the first node to a preset potential; The second reset module is electrically connected to the scan signal output node, the output module, the second reset control terminal and the third reset control terminal, and is used to reset the scan signal output node and the output module to a preset potential under the control of the second reset control terminal and the third reset control terminal.

9. The scan driving circuit according to claim 5, characterized in that: The first adjustment module includes a first control tube, the second adjustment module includes a second control tube, the third adjustment module includes a third control tube, and the fourth adjustment module includes a fourth control tube; The control end of the first control tube is electrically connected to the (i+1)th clock signal end, the first conductive end of the first control tube is electrically connected to the first voltage end, and the second conductive end of the first control tube is electrically connected to the control node, and is used to be turned on under the control of the clock signal output by the (i+1)th clock signal end, so as to control the first voltage end to output a first level signal to the control node, so as to pull the control node to a first potential; The control end of the second control transistor is electrically connected to the (i+2)th clock signal end, the first conductive end of the second control transistor is electrically connected to the control node, and the second conductive end of the second control transistor is electrically connected to the second voltage end, and is used to be turned on under the control of the clock signal output by the (i+2)th clock signal end, so as to control the second voltage end to output a second level signal to the control node, so as to pull the control node to a second potential; The control end of the third control tube is electrically connected to the (i+3)th clock signal end, the first conductive end of the third control tube is electrically connected to the first voltage end, and the second conductive end of the third control tube is electrically connected to the control node, and is used to be turned on under the control of the clock signal output by the (i+3)th clock signal end, so as to control the first voltage end to output a first level signal to the control node, so as to pull the control node to a first potential; The control end of the fourth control tube is electrically connected to the i+4th clock signal end, the first conductive end of the fourth control tube is electrically connected to the control node, and the second conductive end of the fourth control tube is electrically connected to the second voltage end, and is used to be turned on under the control of the clock signal output by the i+4th clock signal end, so as to control the second voltage end to output a second level signal to the control node, so as to pull the control node to the second potential.

10. The scan driving circuit according to claim 9, wherein: The control module includes a fifth control tube, the control tube of the fifth control tube is electrically connected to the control node, the first conductive end of the fifth control tube is electrically connected to the scan signal output node, and the second conductive end of the fifth control tube is electrically connected to the second voltage end; In the second period, the control node controls the fifth control tube to be turned on, and the second voltage terminal outputs a second level signal to the scan signal output node to control the scan signal output node to output a scan signal of a second potential; In the third period, the control node controls the fifth control tube to be turned off, and the second voltage terminal stops outputting the second level signal to the scan signal output node, so as to control the scan signal output node to output the scan signal of the first potential; In the fourth period, the control node controls the fifth control tube to be turned on, and the second voltage terminal outputs the second level signal to the scan signal output node to control the scan signal output node to output the scan signal of the second level signal.

11. A touch display panel, characterized in that: It includes pixel units arranged in an array, a data driving circuit and a scanning driving circuit as described in any one of claims 1 to 10, wherein the scanning driving circuit is used to output the scanning signal to the pixel unit through a scanning line, and is used to control the pixel unit to receive a data signal from the data driving circuit through a data line, the pixel unit includes a pixel electrode and a common electrode, the pixel electrode and the common electrode perform image display according to the data signal during a display period within a frame of image display period, the common electrode is also used to detect touch operation during a touch period within a frame of image display period, and the display period and the touch period are continuous in time.

Images