WO2020259484A1

WO2020259484A1 - Drive circuit and method for display panel, and display device

Info

Publication number: WO2020259484A1
Application number: PCT/CN2020/097667
Authority: WO
Inventors: 黄笑宇
Original assignee: 惠科股份有限公司; 重庆惠科金渝光电科技有限公司
Priority date: 2019-06-27
Filing date: 2020-06-23
Publication date: 2020-12-30
Also published as: CN110459184A

Abstract

Disclosed are a drive circuit and method for a display panel, and a display device. The drive circuit (300) comprises a gate drive circuit (320) and a charge neutralization control circuit (330). The gate drive circuit (320) comprises a plurality of gate drive signal output ends (321) respectively connected to a plurality of gate lines (340) of a display panel (200), correspondingly. The charge neutralization control circuit (330) comprises a first supply circuit (350), a plurality of switch circuits (332), and a switch control signal circuit (360).

Description

Drive circuit, drive method and display device of display panel

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on June 27, 2019. The application number is 201910564631.9 and the application title is "A display panel drive circuit, drive method and display device". The entire content of the application is approved The reference is incorporated in this application.

Technical field

The present application relates to the field of display technology, and in particular to a driving circuit, a driving method and a display device of a display panel.

Background technique

The statements here only provide background information related to this application, and do not necessarily constitute prior art.

TFT-LCD (Thin Film Transistor Liquid Crystal Display) is one of the main types of current flat panel displays and has become an important display platform in modern IT and video products. The main driving principle of TFT-LCD, the system motherboard connects the R/G/B compression signal, control signal and power supply to the connector on the PCB board through wires, and the data is processed by the TCON (Timing Controller) IC on the PCB board. Then, through the PCB board, the S-COF (Source-Chip on Film) and G-COF (Gate-Chip on Film) are connected to the display area of the display panel, so that The display panel gets the required power and signals.

In practical applications, if the charge in the pixel electrode is not completely released during shutdown, the voltage provided by the residual charge in some areas will maintain the deflection of the liquid crystal molecules and maintain the screen display in some areas, resulting in problems such as shutdown image retention.

Summary of the invention

The purpose of this application is to provide a driving circuit, a driving method, and a display device for a display panel that can improve the afterimage of shutdown.

The present application discloses a driving circuit for a display panel, which includes a gate driving circuit and a charge neutralization control circuit. The gate driving circuit includes a plurality of gate driving signal output terminals, and the plurality of gate driving signal output terminals Are respectively connected to the plurality of gate lines of the display panel in a one-to-one correspondence; the charge neutralization control circuit is respectively connected to the plurality of gate drive signal output terminals and the plurality of gate lines of the display panel; The charge neutralization control circuit includes a first power supply circuit, a switch control signal circuit, and a plurality of switch circuits. The first power supply circuit provides a high-level signal; the switch control signal circuit detects the actual operating voltage of the display panel , And output a switch control signal according to the actual working voltage. When the actual working voltage drops, it means that the display panel has started the shutdown procedure; the control terminals of the multiple switch circuits are connected to the output terminals of the switch control signal circuit, and the input terminals are connected In the first power supply circuit, the output terminals are respectively connected to a plurality of the gate lines; wherein, when the switch control signal circuit of the charge neutralization control circuit detects that the actual operating voltage meets a preset rule, The switch control signal circuit generates a switch control signal to control turning on the plurality of switch circuits, and the high-level signal is output to the plurality of gate lines of the display panel.

The application also discloses a driving method of the driving circuit of the display panel, which is applied to the driving circuit of the above-mentioned display panel, and includes the steps:

Detecting the actual working voltage of the display panel, and correspondingly outputting different switch control signals according to whether the actual working voltage satisfies a preset rule to control the on or off of multiple switch circuits;

When the actual operating voltage does not meet the preset rule, it is determined to be a normal operating state, a switch control signal controls a plurality of switch circuits to remain closed, and the gate drive circuit outputs a gate drive signal to the gate drive signal output terminal through the gate drive signal output terminal. The gate line of the display panel; when the actual operating voltage meets a preset rule, it is determined to be a shutdown state, and a switch control signal controls a plurality of switch circuits to conduct, so as to output a high level signal to all gates of the display panel line.

The application also discloses a display device, including a driving circuit and a display panel, and the driving circuit drives the display panel to display.

In this application, a charge neutralization control circuit provides a high level for all gate lines. When shutting down, when the charge neutralization control circuit receives the actual operating voltage of the display panel, it generates a switch control signal to control the conduction. The plurality of switch circuits respectively corresponding to control each gate line of the display panel, the control terminal of each switch circuit is respectively connected to the output terminal connected to the switch control signal circuit, and the input terminal is respectively connected to a High level, when the display panel is working normally, all the switching circuits will remain closed, so that it will not affect the voltage input to the gate line when the display panel is working normally. Once it is turned off, the actual display panel will be detected. The operating voltage will generate the switching control signal, and the switching circuit will be turned on one by one, providing the same voltage to all the gate lines, turning on all the thin film transistors, thereby quickly neutralizing the charges in all the pixel electrodes, improving the local Screen display problems, thereby improving the afterimage of shutdown.

Description of the drawings

The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the embodiments of the present application, and together with the text description, explain the principle of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor. In the attached picture:

FIG. 1 is a schematic diagram of a display device according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a gate driving circuit according to an embodiment of the present application;

Fig. 3 is a schematic diagram of a driving signal according to an embodiment of the present application;

4 is a schematic diagram of a gate driving circuit and its comparator according to another embodiment of the present application;

FIG. 5 is a schematic diagram of a driving signal of another embodiment of the present application;

FIG. 6 is a schematic diagram of a gate driving circuit, a comparator, and a flip-flop according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a driving method of an embodiment of the present application;

FIG. 8 is a schematic diagram of a driving circuit of another embodiment of the present application;

FIG. 9 is a schematic diagram of a driving signal of another embodiment of the present application;

Fig. 10 is a schematic diagram of a charge neutralization control circuit and its inverter according to an embodiment of the present application;

FIG. 11 is a flowchart of a driving method according to an embodiment of the present application.

Detailed ways

It should be understood that the terminology, specific structure and function details disclosed herein are only for describing specific embodiments and are representative. However, this application can be implemented in many alternative forms and should not be interpreted as It is only limited to the embodiment described here.

In the description of this application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features; "plurality" means two or more. The term "comprising" and any variations thereof means non-exclusive inclusion, the possibility of the presence or addition of one or more other features, integers, steps, operations, units, components, and/or combinations thereof.

In addition, "center", "horizontal", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" The terms indicating the orientation or positional relationship are described based on the orientation or relative positional relationship shown in the drawings, and are only used to facilitate the simplified description of the application, rather than indicating that the pointed device or element must have a specific orientation , It is constructed and operated in a specific orientation, so it cannot be understood as a limitation of this application.

In addition, 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 also be electrical connection; it can be directly connected, it can also be indirectly connected through an intermediate medium, or the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

The application will be further described below with reference to the drawings and optional embodiments.

As shown in FIGS. 1 to 3, an embodiment of the present application discloses a display device 100, which includes a driving circuit 300 and a display panel 200. The driving circuit 300 drives the display panel 200 to display, and the driving circuit 300 includes a gate driver. A circuit 320 and a charge neutralization control circuit 330. The gate driving circuit 320 includes a plurality of gate driving signal output terminals 321, and the plurality of gate driving signal output terminals 321 are respectively connected to the display panel 200 in a one-to-one correspondence. The plurality of gate lines 340; the charge neutralization control circuit 330 is connected to the plurality of gate drive signal output terminals and the plurality of gate lines of the display panel, respectively.

Specifically, the charge neutralization control circuit 330 includes a first power supply circuit 350, a switch control signal circuit 360, and a plurality of switch circuits 332. The first power supply circuit provides a high-level signal (VGH); the switch control The signal circuit 360 receives the actual operating voltage of the display panel, generates a switch control signal and outputs it; a plurality of switch circuits 332 control and output high-level signals to each different gate line 340 one by one, and the control terminal is connected to the switch The output end of the control signal circuit, the input end is connected to the first power supply circuit, and the output ends are respectively connected to a plurality of the gate lines in a one-to-one correspondence; wherein, when the switch control signal circuit of the charge neutralization control circuit detects When the actual operating voltage complies with the preset rule, the switch control signal circuit generates a switch control signal to control to turn on the multiple switch circuits, and output the high voltage through multiple output terminals of the multiple switch circuits. The flat signal is sent to the multiple gate lines of the display panel to turn on all the thin film transistor switches corresponding to all the gate lines 340, so that the charges in all the pixel electrodes in the display panel 200 are quickly neutralized, preventing shutdown , The voltage difference formed by the charge discharge causes display abnormalities, such as screen smear.

As shown in FIGS. 4 to 5, in order to enable the switch circuit 332 to be turned on in time and effectively, a comparator 333 is also provided in the switch control signal circuit, and the first input terminal of the comparator receives the actual display panel The output terminal of the comparator is respectively connected to a plurality of control terminals of the plurality of switching circuits; the second input terminal of the comparator is connected to a preset reference voltage; wherein, the comparator receives the display For the actual operating voltage of the panel, the actual operating voltage of the display panel is compared with the preset reference voltage, and the switch control signal is generated according to the comparison result to control the switch circuit to be turned on or off.

The voltage of the display panel during normal operation is the rated operating voltage. When the display panel is shut down or some abnormal conditions such as a short circuit occur, the actual operating voltage of the display panel will drop. In order to prevent the received voltage at the time of shutdown from being inaccurate, accidentally turn on the switch The circuit 332 causes other display problems. It compares the actual operating voltage of the display panel with the reference voltage, and outputs a high-level signal or a low-level signal according to the comparison result to control the switching circuit 332 to conduct, which is very convenient and quick. It should be noted that when setting the preset reference voltage, it will be set according to the specific parameters of the display panel 200. Different display panels 200 have different parameters, and the specific size of the preset reference voltage set is inconsistent. It is optimal that the voltage is greater than 50% of the rated working voltage and less than 90% of the rated working voltage, and the preset reference voltage is equal to 90% of the actual working voltage. Within this range, shutdown can be prevented When the actual operating voltage drops too slowly, the switching comparator 333 fails to respond in time.

It should be further noted that if the first input terminal of the comparator is a positive input terminal and the second input terminal is a negative input terminal, then the switch circuit 332 is a switch turned on by a low-level signal, and the first input terminal The actual working voltage (VGH1) is collected, and the second input terminal is connected to a preset reference voltage (Vref). When the voltage of the actual working voltage is greater than the preset reference voltage, a high-level signal is output. At this time, the switch circuit 332 does not need to be turned on When the actual working voltage is less than the preset reference voltage, a low-level signal is output. At this time, the switch circuit 332 can select a thin film transistor that is turned on by the low-level signal, and the corresponding switch circuit is a low-level signal-turned switch.

In addition, we can know from the above that when the actual operating voltage is less than the preset reference voltage, a switch control signal is generated to control the turning on of the multiple switch circuits, and the high-level signal is output to the multiple gate lines to turn on All the thin film transistors in the display panel neutralize the charge in all the pixel electrodes in the display panel, thereby reducing or even eliminating the shutdown image. Because the actual operating voltage is lower than the rated operating voltage, when the actual operating voltage is only equal to the preset The reference voltage can also determine that the display panel is already in shutdown mode. At this time, a voltage detection circuit can also be used instead of the comparator. The voltage detection circuit determines whether the actual working voltage is equal to the preset reference voltage. When the reference voltage is set, a switch control signal is immediately generated to control to turn on the multiple switch circuits.

As shown in FIGS. 6 to 7, the switch control signal circuit further includes a preset logic level signal VDD and a flip-flop, the control pin of the flip-flop is connected to the output terminal of the comparator, and the flip-flop The input pin is connected to the predetermined logic level signal, and the output pins of the trigger are respectively connected to the control terminals of a plurality of the switch circuits; wherein, the output terminals of the comparator are correspondingly connected through the trigger To the multiple control terminals of the multiple switch circuits, when the comparator outputs a comparison result to trigger the trigger, a switch control signal is generated by the trigger to control the on or off of the multiple switch circuits, At this time, for the switch circuit 332, it can be a thin film transistor turned on by a high-level signal, or it may be a thin film transistor turned on by a low-level signal, which can be specifically set according to the actual circuit; it should be noted that, The control pin of the flip-flop 334 is connected to the output terminal of the comparator 333, the input pin of the flip-flop 334 is connected to an output terminal of a preset logic level, and the output pins of the flip-flop 334 are respectively Correspondingly connected to the multiple control terminals of the multiple switch circuits 332; wherein, the output terminal of the comparator is connected to the multiple control terminals of the multiple switch circuits through the trigger correspondingly, and when the comparator output compares As a result, when the trigger is triggered, the switch control signal is generated by the trigger to control the conduction of the plurality of switch circuits. The above-mentioned flip-flop 334 includes a falling edge flip-flop, the preset logic level signal is a logic high level signal, the switch circuit includes a high-level signal turn-on switch, the high-level signal turn-on switch is receiving Turn on when high-level signal, turn off when receiving low-level signal;

Wherein, the comparator compares the actual working voltage with the preset reference voltage, and outputs a low level signal to trigger the trigger according to the comparison result, and after the trigger is triggered, outputs a high level The switch control signal of the signal controls the switch circuit to conduct.

Of course, if the first input terminal of the comparator is a negative input terminal and the second input terminal is a positive input terminal, when the actual working voltage is greater than the preset reference voltage, a low-level signal is output. At this time, the switch circuit 332 does not need to perform Turn on, when the actual working voltage (VGH1) is less than the preset reference voltage (Vref), a high-level signal is output, the flip-flop 334 is selected as a rising edge trigger, and the preset logic level signal is a logic high level signal , The switch circuit includes a high-level signal turn-on switch, the high-level signal turn-on switch turns on when receiving a high-level signal, and turns off when receiving a low-level signal; the comparator turns the actual The operating voltage is compared with the preset reference voltage, and a high-level signal is output to trigger the trigger according to the comparison result. After the trigger is triggered, a switch control signal of a high-level signal is output to control the switch circuit Conduction.

As shown in FIGS. 8-9, as another embodiment of the present application, the difference from the above-mentioned embodiment is that the charge neutralization control circuit 330 further includes a flip-flop 334, and the flip-flop 334 communicates with the comparator. 333 and a plurality of the switch circuits 332, the control pin of the flip-flop 334 is connected to the output terminal of the comparator 333, and the input pin of the flip-flop 334 is connected to the output of a preset logic high level signal The output pins of the flip-flop 334 are respectively connected to the multiple control terminals of the multiple switch circuits 332; the control terminal of each switch circuit 332 is respectively connected to the input of each switch circuit 332 The logic high level signal can be set to specific values according to the parameters of different display panels 200. The logic high level is sufficient to turn on all the thin film transistors in the display panel 200, and the charge of all the pixel electrodes in the display panel 200 In progress.

In all the above embodiments, the display panel is divided into a display area and a non-display area, the non-display area includes a bonding area, and the gate driving circuit and the charge neutralization control circuit are respectively connected through the bonding area. The fixed area bonding is connected to the display panel. It should be noted that the multiple output pins of the gate driving circuit and the gate driving circuit are arranged on the flip chip film, and the charge neutralization control circuit can also be arranged on the flip chip film , And then respectively connected to the output pins; or it can be set in the non-display area, and the fan-out wiring of the fan-out area is set on a different metal layer, and then respectively connected to multiple output pins or output pins and scan lines Fan-out routing between.

As shown in FIG. 10, as another embodiment of the present application, the difference from the above-mentioned embodiment is that the flip-flop 334 is replaced by an inverter 335. The charge neutralization control circuit 330 includes an inverter 335. The inverter 335 connects the comparator 333 with the plurality of switch circuits 332, the input terminal of the inverter 335 is connected to the output terminal of the comparator 333, and the output terminal of the inverter 335 is respectively connected to Multiple control terminals of the switching circuit 332; wherein the inverter outputs an opposite level signal according to the received level signal, and the inverter generates the switch control signal according to the comparison of the comparator To control the conduction of a plurality of the switch circuits. Wherein, the inverter 335 outputs an opposite level signal according to the received level signal, a plurality of the switch circuits 332 are turned on when the low level signal is When the comparator 335 outputs a high-level signal, the switch circuit 332 corresponds to the thin film transistor set to be turned on by the high-level signal. When the comparator outputs a high-level signal, the inverter 335 outputs a low-level signal, and the switch circuit 332 Corresponding to the thin film transistors set to be turned on by low-level signals, as long as the switch circuit 332 can be turned on, it is feasible to output high-level signals to all the gate lines 340.

Wherein, the driving circuit 300 of the present application further includes a grounding control circuit 370. During normal operation, the grounding control circuit disconnects the pixel electrode 380 and the ground terminal. When shutting down is detected, the charge neutralization control circuit 330 sends a high level signal While outputting to all the gate lines 340, the grounding control circuit 370 is turned on to connect all the pixel electrodes 380 to the ground terminal for grounding discharge, so as to better eliminate the residual image and achieve a better effect of eliminating the residual image.

Correspondingly, as shown in FIG. 11, a method for driving a gate driving circuit of a display panel is disclosed, which is applied to the gate driving circuit in the above embodiment, and includes the steps:

S1: Detect the actual working voltage of the display panel, and correspondingly output different switch control signals according to whether the actual working voltage meets the preset rule to control the on or off of multiple switch circuits;

S2: When the actual working voltage does not meet the preset rule, it is determined to be a normal working state, a switch control signal controls a plurality of switch circuits to remain closed, and the gate drive circuit outputs a gate drive through the gate drive signal output terminal Signal to the gate line of the display panel; when the actual working voltage satisfies the preset rule, it is determined to be the off state, and the switch control signal controls the multiple switch circuits to conduct, so as to output a high level signal to all the display panel Grid line.

Mainly by turning on all the switching circuits at the same time, so as to input high level to each gate line at the same time, so as to turn on all the thin film transistors connecting the pixel electrode and the gate line in the display panel, and turn on all the pixels. The charge in the electrode is neutralized.

In the above steps, whether the preset rules are met is determined by comparing the actual working voltage with the preset reference voltage. The voltage when the display panel is in normal working state is the rated working voltage, and the preset reference voltage is greater than the rated working voltage. 50% of the voltage and less than 90% of the rated working voltage, when the actual working voltage is greater than the preset reference voltage, the actual working voltage does not meet the preset rule; when the actual working voltage is less than or equal to the preset reference voltage When the actual working voltage meets the preset rules.

Compare the voltage of the actual operating voltage with the preset reference voltage to determine whether the actual operating voltage is correct, and prevent some voltages in the circuit from fluctuating within the normal range, causing all the switches to be turned on, causing a gap between the gate lines The interconnection of each other leads to abnormal situations.

It should be noted that the limitation of each step involved in this plan is not deemed to be a limitation on the order of the steps without affecting the implementation of the specific plan. The steps written in the front can be executed first. It can also be executed later, or even simultaneously. As long as the solution can be implemented, it should be regarded as belonging to the protection scope of this application.

The technical solution of the present application can be widely used in various display panels, such as twisted nematic (TN) display panels, in-plane switching (IPS) display panels, vertical alignment (Vertical Alignment, VA) ) Display panel, Multi-Domain Vertical Alignment (MVA) display panel, of course, it can also be other types of display panel, such as Organic Light-Emitting Diode (OLED) display panel. Apply the above scheme.

The above content is a further detailed description of the application in conjunction with specific optional implementations, and it cannot be considered that the specific implementation of the application is limited to these descriptions. For those of ordinary skill in the technical field to which this application belongs, a number of simple deductions or substitutions can be made without departing from the concept of this application, which should be regarded as falling within the protection scope of this application.

Claims

A drive circuit for a display panel, the display panel includes a plurality of gate lines, and the drive circuit includes:

The gate driving circuit includes a plurality of gate driving signal output terminals, which are respectively connected to the plurality of gate lines of the display panel in a one-to-one correspondence; and

A charge neutralization control circuit, the output ends of which are respectively connected to a plurality of said gate lines;

The charge neutralization control circuit includes:

The first power supply circuit provides a high-level signal;

The switch control signal circuit detects the actual working voltage of the display panel, and outputs the switch control signal according to the actual working voltage; and

A plurality of switch circuits, the control terminal is connected to the output terminal of the switch control signal circuit, the input terminal is connected to the first power supply circuit, and the output terminal is respectively connected to the plurality of gate lines;

Wherein, when the switch control signal circuit of the charge neutralization control circuit detects that the actual operating voltage conforms to a preset rule, the switch control signal circuit generates a switch control signal to control turning on the plurality of switch circuits, and The high-level signal is output to the plurality of gate lines.
3. The driving circuit of a display panel according to claim 1, wherein the switch control signal circuit comprises a comparator;

The comparator includes:

The first input terminal receives the actual working voltage of the display panel;

The second input terminal is connected to a preset reference voltage; and

The output terminals are respectively connected to multiple control terminals of the multiple switch circuits;

Wherein, the comparator receives the actual operating voltage of the display panel, compares the actual operating voltage with the preset reference voltage, and generates the switch control signal according to the comparison result to control the switch circuit to be turned on or off .
The driving circuit of a display panel according to claim 2, wherein the voltage when the display panel is working normally is a rated operating voltage, and the preset reference voltage is greater than 50% of the rated operating voltage and less than the 90% of rated working voltage;

When the actual working voltage is less than the preset reference voltage, it is determined that the preset rule is satisfied.
3. The driving circuit of a display panel according to claim 2, wherein the switch control signal circuit further comprises:

Preset logic level signal; and

Flip-flop, a control pin is connected to the output terminal of the comparator, an input pin is connected to the preset logic level signal, and an output pin is respectively connected to the control terminals of a plurality of the switch circuits;

Wherein, the output terminal of the comparator is correspondingly connected to the control terminals of a plurality of the switch circuits through the trigger, and when the output of the comparator triggers the trigger, the switch control is generated by the trigger The signal is used to control the on or off of the plurality of switch circuits.
7. The driving circuit of a display panel according to claim 4, wherein the trigger comprises a falling edge trigger, the predetermined logic level signal is a logic high level signal, and the switch circuit comprises a high level signal. A signal turn-on switch, the high-level signal turn-on switch is turned on when receiving a high-level signal, and turned off when receiving a low-level signal;

The comparator compares the voltage of the actual operating voltage with the preset reference voltage. When the comparator outputs a low-level signal according to the comparison result, the trigger is triggered, and the trigger The device outputs a high-level switch control signal to control the switch circuit to conduct.
The driving circuit of a display panel according to claim 2, wherein the display panel is divided into a display area and a non-display area, the non-display area includes a bonding area, the gate driving circuit and the charge The neutralization control circuit binds the plurality of gate lines connected to the display panel through the bonding area, respectively.
3. The driving circuit of a display panel according to claim 2, wherein the switch control signal circuit further comprises:

A trigger, a control pin is connected to the output terminal of the comparator, an input pin is connected to the output terminal of the first power supply circuit, and the output pins are respectively connected to the control terminals of a plurality of the switch circuits;

The control terminal and input terminal of each switch circuit are respectively connected to each other.
3. The driving circuit of a display panel according to claim 2, wherein the first input terminal is a positive input terminal, the second input terminal is a negative input terminal, and the switch circuit is turned on by a low-level signal Switch.
7. The driving circuit of a display panel according to claim 1, wherein the switch control signal circuit comprises a detection circuit, and the detection circuit determines whether the actual operating voltage of the display panel is equal to the predetermined reference voltage For comparison, when the actual working voltage is equal to the preset reference voltage, the switch control signal is immediately generated to control the turning on of the multiple switch circuits.
The driving circuit of a display panel according to claim 1, wherein the charge neutralization control circuit includes a flip-flop, and the flip-flop communicates with the comparator and a plurality of the switch circuits, and the trigger The control pin is connected to the output terminal of the comparator, the input pin of the trigger is connected to the output terminal of a preset logic high level signal, and the output pins of the trigger are respectively connected to a plurality of the switches. Multiple control terminals of the circuit; the control terminal of each switch circuit is respectively connected to the input terminal of each switch circuit.
The driving circuit of a display panel according to claim 1, wherein the charge neutralization control circuit includes an inverter, and the inverter connects the comparator and a plurality of the switch circuits, and the inverter The input terminal of the inverter is connected to the output terminal of the comparator, and the output terminal of the inverter is respectively connected to the multiple control terminals of the multiple switching circuits;

Wherein, the inverter outputs an opposite level signal according to the received level signal, and the inverter generates the switch control signal according to the comparison result of the comparator to control the conduction of a plurality of the switch circuits .
3. The driving circuit of a display panel according to claim 1, wherein the driving circuit further comprises a grounding control circuit, and during normal operation, the grounding control circuit disconnects the pixel electrode and the ground terminal.
A driving method of a display panel, the display panel including a plurality of switching circuits, a gate driving circuit, and a plurality of gate lines, the driving method includes the steps:

Detecting the actual working voltage of the display panel, and correspondingly outputting different switch control signals according to whether the actual working voltage satisfies the preset rule to control the on or off of multiple switch circuits;

When the actual operating voltage does not meet the preset rule, it is determined to be a normal operating state, the switch control signal controls the plurality of switch circuits to maintain the closed state, and the gate drive circuit outputs the gate drive through the gate drive signal output terminal Signal to the gate line of the display panel; when the actual operating voltage satisfies a preset rule, it is determined to be a shutdown state, and the switch control signal controls the plurality of switch circuits to conduct to output a high-level signal to the The plurality of gate lines of the display panel.
The method for driving a display panel according to claim 13, wherein said detecting the actual operating voltage of the display panel, and correspondingly outputting different switching control signals to control a plurality of switching circuits according to whether the actual operating voltage satisfies a preset rule The steps of closing or turning on include:

When the actual operating voltage is greater than the preset reference voltage, it is deemed that the actual operating voltage does not meet the preset rule; when the actual operating voltage is less than the preset reference voltage, it is deemed that the actual operating voltage meets the preset rule;

Wherein, the voltage when the display panel is in a normal working state is a rated working voltage, and the preset reference voltage is greater than 50% of the rated working voltage and less than 90% of the rated working voltage.
A method for driving a display panel according to claim 14, wherein the driving circuit includes a switch control signal circuit and a switch circuit, the switch control signal circuit includes a trigger, and detects the actual operating voltage of the display panel according to Whether the actual working voltage satisfies the preset rule and correspondingly outputting different switch control signals to control the on or off of multiple switch circuits includes:

When the output signal of the comparator triggers the trigger, the switch control signal is generated by the trigger to control the on or off of the plurality of switch circuits. ；

When the preset rule is met, output a high-level signal, and the trigger generates a high-level signal to control the conduction of a plurality of the switch circuits;

When the preset rule is not met, a low-level signal is output, and the trigger generates a low-level signal to control the plurality of switch circuits to turn off.
A display device includes a display panel and a drive circuit, the drive circuit drives the display panel to display, the display panel includes a plurality of gate lines, and the drive circuit includes:

The gate driving circuit includes a plurality of gate driving signal output terminals, which are respectively connected to the plurality of gate lines of the display panel in a one-to-one correspondence; and

A charge neutralization control circuit, the output ends of which are respectively connected to a plurality of said gate lines;

The charge neutralization control circuit includes:

The first power supply circuit provides a high-level signal;

The switch control signal circuit detects the actual working voltage of the display panel, and outputs the switch control signal according to the actual working voltage; and

A plurality of switch circuits, the control terminal is connected to the output terminal of the switch control signal circuit, the input terminal is connected to the first power supply circuit, and the output terminal is respectively connected to a plurality of the gate lines;

Wherein, when the switch control signal circuit of the charge neutralization control circuit detects that the actual operating voltage conforms to a preset rule, the switch control signal circuit generates a switch control signal to control turning on the plurality of switch circuits, and The high-level signal is output to the plurality of gate lines.
A display device according to claim 16, wherein said switch control signal circuit includes a comparator;

The comparator includes:

The first input terminal receives the actual working voltage of the display panel;

The second input terminal is connected to a preset reference voltage; and

The output terminals are respectively connected to multiple control terminals of the multiple switch circuits;

Wherein, the first input terminal is a positive input terminal, the second input terminal is a negative input terminal, the switch circuit is a switch that is turned on by a low-level signal; the comparator receives the actual operation of the display panel Voltage, comparing the actual working voltage with the preset reference voltage, and generating the switch control signal according to the comparison result to control the switch circuit to be turned on or off.