CN115881052A - Liquid crystal panel discharge circuit and discharge method thereof, display chip and electronic equipment - Google Patents

Abstract

The present disclosure provides a liquid crystal panel discharge circuit, a discharge method thereof, a display chip and an electronic device, wherein the circuit includes: the first end of each first switch module is connected with the reference voltage signal end, and the second end of each first switch module is grounded; the first end of each second switch module is connected with the first end of the corresponding first switch module; the first end of each third switch module is connected with the second end of the corresponding second switch module, and the second end of each third switch module is connected with the output end of each display signal in the corresponding group; and the controller is connected with the third end of each first switch module, the third end of each second switch module, the third end of each third switch module and the fourth end of each third switch module, and is used for determining the action of starting shutdown and controlling each first switch module, each second switch module and each third switch module so as to release the stored charges in the liquid crystal panel and avoid screen flashing.

Description

Liquid crystal panel discharge circuit and discharge method thereof, display chip and electronic equipment

Technical Field

The disclosure relates to the technical field of display, and in particular to a liquid crystal panel discharge circuit, a discharge method thereof, a display chip and an electronic device.

Background

In the display application of the liquid crystal panel, the discharge problem of the liquid crystal panel is much disturbed. Because of the demand for reducing the power consumption of the liquid crystal panel, the application of low refresh rate is proposed, but the retention time of the electric charge stored in the liquid crystal panel is prolonged while the low refresh rate is satisfied, and a new problem is introduced while the retention time of the electric charge stored in the liquid crystal panel is prolonged: the release of the stored charges in the liquid crystal panel is slow, i.e. the off-state discharge is difficult.

Therefore, how to solve the problem of releasing the stored charges inside the liquid crystal panel during shutdown is an urgent problem to be solved at present.

Disclosure of Invention

The disclosure provides a liquid crystal panel discharge circuit, a discharge method thereof, a display chip and an electronic device. The specific scheme is as follows:

an embodiment of the present disclosure provides a liquid crystal panel discharge circuit, including:

a plurality of first switch modules, a first end of each of the first switch modules being connected to a reference voltage signal end, a second end of each of the first switch modules being grounded;

a plurality of second switch modules, a first end of each of the second switch modules being connected to a first end of a corresponding one of the first switch modules;

a plurality of third switch modules, a first end of each of the third switch modules being connected to a second end of the corresponding second switch module, and each second end of each of the third switch modules being connected to each display signal output end in the corresponding group;

the controller is connected with the third end of each first switch module, the third end of each second switch module, the third end of each third switch module and the fourth end of each third switch module, and is used for determining the start of shutdown actions and controlling each first switch module, each second switch module and each third switch module so as to release charges stored in the liquid crystal panel.

In another aspect of the present disclosure, a discharging method based on the above-mentioned liquid crystal panel discharging circuit is provided, including the following steps:

determining to start a shutdown action;

and controlling the first switch modules, the second switch modules and the third switch modules to release the charges stored in the liquid crystal panel.

In another embodiment of the present disclosure, a display chip is provided, which includes the above-mentioned liquid crystal panel discharge circuit.

An embodiment of another aspect of the present disclosure provides an electronic device, which includes the above display chip.

The technical scheme provided by the embodiment of the disclosure at least brings the following beneficial effects:

through the embodiment of this disclosure, liquid crystal display panel discharge circuit includes: the first end of each first switch module is connected with the reference voltage signal end, and the second end of each first switch module is grounded; the first end of each second switch module is connected with the first end of the corresponding first switch module; the first end of each third switch module is connected with the second end of the corresponding second switch module, and the second end of each third switch module is connected with the output end of each display signal in the corresponding group; and the controller is connected with the third end of each first switch module, the third end of each second switch module, the third end of each third switch module and the fourth end of each third switch module, and is used for determining the startup and shutdown actions and controlling each first switch module, each second switch module and each third switch module so as to release the charges stored in the liquid crystal panel. Therefore, when the shutdown action is determined to be started, the circuit can synchronously discharge to the ground when no voltage difference exists between the reference voltage signal end and the display signal output end through controlling the first switch modules, the second switch modules and the third switch modules, and therefore the problem of screen flashing of the display screen can be avoided.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure.

Drawings

The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a Source IC burned by ESD in the related art;

FIG. 2 is a waveform diagram of a power-down of a liquid crystal panel when a discharge circuit is not added in the related art;

FIG. 3 is a schematic view showing the display principle in a liquid crystal panel according to the related art;

fig. 4 is a circuit diagram of a liquid crystal panel discharge circuit in the related art;

FIG. 5 is a simplified circuit diagram of one circuit when the liquid crystal panel discharge circuit shown in FIG. 4 is used;

FIG. 6 is a schematic diagram of a discharge circuit of a liquid crystal panel according to an embodiment of the disclosure;

FIG. 7 is a simplified circuit diagram of one circuit when the liquid crystal panel discharge circuit shown in FIG. 6 is used;

FIG. 8 is a waveform illustrating power down of a liquid crystal panel when a discharge circuit is incorporated in the present disclosure;

FIG. 9 is a timing diagram of the synchronous power down of Sout and Vcom according to the present disclosure;

fig. 10 is a flowchart of a discharging method of a liquid crystal panel discharging circuit according to an embodiment of the present disclosure.

Detailed Description

In order to make the technical solutions of the present disclosure better understood by those of ordinary skill in the art, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings.

It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the foregoing drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in sequences other than those illustrated or otherwise described herein. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

A liquid crystal panel discharge circuit, a discharge method of the liquid crystal panel discharge circuit, a display chip, and an electronic apparatus of the embodiments of the present disclosure are described below with reference to the drawings.

Before the liquid crystal panel discharge circuit of the present disclosure is introduced, the liquid crystal panel discharge circuit in the related art will be introduced.

In the display application of the liquid crystal panel, the problem of discharging the stored charges inside the liquid crystal panel is much troubled. Because of the demand for reducing the power consumption of the liquid crystal panel, the application of low refresh rate is proposed, but the retention time of the electric charge stored in the liquid crystal panel is prolonged while the low refresh rate is satisfied, and a new problem is introduced while the retention time of the electric charge stored in the liquid crystal panel is prolonged: the release of the stored charges in the liquid crystal panel is slow, i.e. the off-state discharge is difficult.

In particular, if the liquid crystal panel is an Oxide (metal Oxide silicon) liquid crystal panel, the discharge of the reference voltage signal terminal Vcom (Vcom is a reference voltage for shifting liquid crystal molecules to rotate the liquid crystal) is slow when the liquid crystal panel is turned off. Generally, an external PCB (Printed Circuit Board) or a Source IC (Source chip) is used to help the reference voltage signal terminal Vcom to complete the discharge. For example, after shutdown, the output voltage of the display signal output Sout, e.g., S1-S960, can be pulled to ground GND quickly using the Source IC, resulting in a large voltage difference between Vcom and Sout.

Supposing that the liquid crystal panel is applied to a Television (TV), according to actual tests, when the TV is turned off, the differential pressure between Vcom and Sout is 5V, the differential pressure exceeds a set differential pressure by 4V, the duration of the differential pressure is 10ms, and the duration of the differential pressure exceeds a set differential pressure by 2ms, at the moment, the liquid crystal panel can be perceived by naked eyes as brightness difference caused by the differential pressure and the duration of the differential pressure, and the liquid crystal display screen flickers. In addition, because of the voltage difference between Vcom and Sout, there will be residual charges on the liquid crystal panel every time the television is turned off, and the polarization of the liquid crystal panel will occur after the television is turned on and off for many times.

In order to solve the problem of Vcom discharge during shutdown, the discharge requirement of the Source IC for Vcom can be started during shutdown, but since a Vcom high-voltage port is introduced into a working circuit of the Source IC, a higher challenge is brought to the Source IC. In practical applications, as shown in fig. 1, a high voltage Vcom port is introduced into a working circuit of the Source IC, which may cause a problem that the Source IC is burned out due to ESD.

Fig. 2 is a power-down waveform diagram of a liquid crystal panel without a discharge circuit in the related art, as shown in fig. 2, a large voltage difference exists between Sout and Vcom, and the voltage difference lasts for a long time, the power-down operation sequence at this time is VDDD (VDDD is a power supply of the control logic) and VDDA (VDDA is a power supply for controlling the output of Sout), and then as shown in fig. 3, the integrated power pipeline circuit PMIC and the Source IC start power-down, vcom and Sout are respectively the outputs of PMIC and Source IC, and they are not related, and the power-down operation sequence is respectively power-down.

Fig. 4 is a circuit diagram of a liquid crystal panel discharge circuit in the related art, as shown in fig. 4, vcom is introduced into a Source IC in the related art, and the design concept of the internal circuit of the Source IC is as follows:

during shutdown, when the Source IC detects that VDDA and VDDD are reduced to below the corresponding threshold voltage, the shutdown operation is initiated, and the switch S-CS is turned on to connect all output channels in the Source IC, such as CH12[1:40], CH12[41:80] are short-circuited together to share electric charge, then S21, S22 and S23 are switched on simultaneously to short-circuit the external Vcom with CS _ NETL and the Vcom with CS _ NETR, and then the two are discharged to the ground GND together. Fig. 5 is a simplified circuit diagram of one line when the liquid crystal panel discharge circuit shown in fig. 4 is used, where C1 in fig. 5 is the parasitic capacitance between Sout and R21, and C2 is the parasitic capacitance between Vcom and R22. The problem with the scheme shown in fig. 4 is that when R21 is smaller than R22, sout can be quickly discharged to GND through S22, but Vcom is discharged very slowly because PCB is connected externally with larger charges, i.e. Sout is discharged faster than Vcom, so that even though Vcom is connected into Source IC, the goal of quick discharge cannot be achieved, and the flash still occurs.

In order to solve the problems, the present disclosure provides a novel liquid crystal panel discharge circuit, which can achieve the purpose of fast discharge after power failure, and avoid the occurrence of screen flashing.

Fig. 6 is a schematic structural diagram of a discharge circuit of a liquid crystal panel according to an embodiment of the present disclosure.

As shown in fig. 6, the liquid crystal panel discharge circuit according to the embodiment of the present disclosure includes: a plurality of first switch modules 81, a plurality of second switch modules 82, a plurality of third switch modules 83, and a controller (not shown in the figure).

A first end of each first switch module 81 is connected to the reference voltage signal end Vcom, and a second end of each first switch module 81 is grounded GND. The reference voltage signal terminal Vcom may include Vcom _ L (one reference voltage signal terminal Vcom disposed at the left side of the Source IC) and Vcom _ R (one reference voltage signal terminal Vcom disposed at the right side of the Source IC), each of the reference voltage signal terminals Vcom being connected through a reference voltage signal Line, the reference voltage signal terminal Vcom being used for inputting a reference voltage signal. A first end of each second switch module 82 is connected to a first end of the corresponding first switch module 81. A first end of each third switch module 83 is connected to the second end of the corresponding second switch module 82, and each second end of each third switch module 83 is connected to each display signal output terminal Sout in the corresponding group. Each group of display signal output terminals Sout includes 12 display signal output terminals such as S1-S12, 8230, S481-S492, each for outputting corresponding display voltage signal. The controller is connected to the third end of each first switch module 81, the third end of each second switch module 82, the third end of each third switch module 83, and the fourth end of each third switch module 83, and is configured to determine to start a shutdown operation, and control each first switch module 81, each second switch module 82, and each third switch module 83, so as to release charges stored in the liquid crystal panel.

It should be noted that a plurality in the present disclosure indicates at least two.

In this embodiment, when the power-off operation is performed, when the Source IC detects that the voltages of VDDA and VDDD are reduced to be lower than the corresponding threshold voltages, the power-off operation is started, and at this time, the third switch module 83 is first controlled to be turned on to short-circuit the Sout outputs together for charge sharing, and the second switch module 82 is simultaneously controlled to be turned on to short-circuit the Sout outputs to Vcom, so that the Sout and Vcom keep the same voltage for the first time, and then the first switch module 81 is controlled to be turned on to discharge the Sout and Vcom to the ground GND at the same time. In the liquid crystal panel, when no voltage difference exists between Sout and Vcom, the synchronous ground discharge is realized, the liquid crystal cannot turn over, the phenomenon of screen flashing cannot be seen, and the problem of screen flashing of the display screen is avoided.

A specific circuit of each block in the liquid crystal panel discharge circuit of the embodiment of the present disclosure is described below with reference to fig. 6.

As shown in fig. 6, the first switch module 81 includes: a first resistor R1 and at least one first switching tube Q1. A first end of the first resistor R1 serves as a first end of the first switch module 81. First ends of the first switching tubes Q1 are connected to a second end of the first resistor R1, second ends of the first switching tubes Q1 are connected to serve as second ends of the first switching modules 81, and control ends of the first switching tubes Q1 are connected to serve as third ends of the first switching modules 81.

In an embodiment of the present disclosure, the number of the at least one first switch Q1 is in a range of [3,6], so that when any one of the plurality of first switch Q1 is damaged, the operation of the discharge circuit is not affected.

As shown in fig. 6, the second switch module 82 includes: a second resistor R2 and a second switch Q2. Wherein, the first end of the second resistor R2 is used as the first end of the second switch module 82. A first end of the second switching tube Q2 is connected to a second end of the second resistor R2, a second end of the second switching tube Q2 serves as a second end of the second switching module 82, and a control end of the second switching tube Q2 serves as a third end of the second switching module 82.

In an embodiment of the present disclosure, the width of the trace between the first end of the second resistor R2 and the reference voltage signal end is widened, for example, the value range can be [18 μm,22 μm ], so as to protect the interior of the Source IC, prevent ESD risk caused by Vcom, and prevent the problem of circuit burnout caused by current overload through the second resistor R2.

As shown in fig. 6, the third switching module 83 includes: a first switching unit 831 and a second switching unit 832. A first end of the first switching unit 831 serves as a first end of the third switching module 83, and a control end of the first switching unit 831 serves as a third end of the third switching module 83. A first end of the second switching unit 832 is connected to a second end of the first switching unit 831, respective second ends of the second switching unit 832 serve as respective second ends of the third switching module 83, and respective control ends of the second switching unit 832 are connected to serve as fourth ends of the third switching module 83.

As shown in fig. 6, the first switching unit 831 includes: and a third switching tube Q3, wherein a first end of the third switching tube Q3 is used as a first end of the first switching unit 831, a second end of the third switching tube Q3 is used as a second end of the first switching unit 831, and a control end of the third switching tube Q3 is used as a third end of the first switching unit 831.

As shown in fig. 6, the second switching unit 832 includes: a plurality of fourth switching tubes Q4 and a plurality of third resistors R3. First ends of the fourth switching tubes Q4 are connected to form a first end of the second switching unit 832. A first end of each third resistor R3 is connected to a second end of the corresponding fourth switching tube Q4, and a second end of each third resistor R3 serves as a second end of the second switching unit 832.

In an embodiment of the present disclosure, the controller is configured to determine to start a shutdown action, and control each of the first switch module 81, the second switch module 82, and the third switch module 83 to release charges stored inside the liquid crystal panel, and the controller includes: controlling each fourth switching tube Q4 to be switched on so as to enable each display signal output end in each group to be in short circuit; controlling the second switching tube Q2 and the third switching tube Q3 to be switched on so as to enable the reference voltage signal end to be in short circuit with each display signal output end in each group; and controlling the first switch tube Q1 to be switched on so as to synchronously ground the reference voltage signal end and each display signal output end, thereby realizing the release of the charges stored in the liquid crystal panel.

In this embodiment, when the Source IC detects that AVDD and DVDD decrease below the corresponding threshold voltages during shutdown, shutdown is initiated. FIG. 7 is a simplified circuit diagram of a circuit when the discharge circuit of the liquid crystal panel shown in FIG. 6 is used, FIG. 8 is a waveform diagram of a power failure of the liquid crystal panel when the discharge circuit is added in the present disclosure, after shutdown, in combination with FIG. 7, the controller first controls all the fourth switching tubes Q4 to be turned on to short-circuit Sout outputs together for charge sharing, and then controls all the third switching tubes Q3 and the second switching tubes Q2 to be turned on to short-circuit the Sout outputs with Vcom to keep the same voltage at the first time of Sout and Vcom, as shown in FIG. 8, the output voltage of S [1] is 2V, the output voltage of S [12] is 12V, and the output voltage of S [1] after short-circuit the Sout outputs with Vcom is 7V. And then all the first switching tubes Q1 are controlled to be switched on, so that Sout and Vcom are simultaneously discharged to the ground GND. In the liquid crystal panel, when no voltage difference exists between Sout and Vcom, the synchronous ground discharge is realized, the liquid crystal cannot turn over, the phenomenon of screen flashing cannot be seen, and the problem of screen flashing of the display screen is avoided.

Even if the resistance value of the second resistor R2 is larger than that of the third resistor R3, the simultaneous discharge of Sout and Vcom to the ground GND can be ensured, and after the discharge is accelerated, the charges originally remained in the liquid crystal panel can be quickly discharged to the ground GND, so that no polarization occurs even if the liquid crystal panel is turned on and off for a long time. The Sout and Vcom power down speed together can be advanced from 10ms to 2ms as shown in FIG. 9.

It should be noted that the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, and the fourth switch tube Q4 in the embodiment of the present disclosure may be controllable switches such as a triode and a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor), and the disclosure is not limited in this specification. C1 in FIG. 7 is the parasitic capacitance between Sout and R3, and C2 is the parasitic capacitance between Vcom and R1 and R2 in parallel relationship.

To sum up, the liquid crystal panel discharge circuit of the embodiment of the present disclosure includes: the first end of each first switch module is connected with the reference voltage signal end, and the second end of each first switch module is grounded; the first end of each second switch module is connected with the first end of the corresponding first switch module; the first end of each third switch module is connected with the second end of the corresponding second switch module, and the second end of each third switch module is connected with each display signal output end in the corresponding group; and the controller is connected with the third end of each first switch module, the third end of each second switch module, the third end of each third switch module and the fourth end of each third switch module, and is used for determining the startup and shutdown actions and controlling each first switch module, each second switch module and each third switch module so as to release the charges stored in the liquid crystal panel. Therefore, when the shutdown action is determined to be started, the circuit can synchronously discharge to the ground when no voltage difference exists between the reference voltage signal end and the display signal output end through controlling the first switch modules, the second switch modules and the third switch modules, and therefore the problem of screen flashing of the display screen can be avoided.

Fig. 10 is a flowchart of a discharging method of a liquid crystal panel discharging circuit according to an embodiment of the present disclosure.

As shown in fig. 10, the discharging method of the liquid crystal panel discharging circuit according to the embodiment of the present disclosure includes:

s101, determining to start shutdown action.

And S102, controlling the first switch modules, the second switch modules and the third switch modules to release the charges stored in the liquid crystal panel.

In an embodiment of the present disclosure, controlling each first switch module, each second switch module, and each third switch module to release charges stored inside a liquid crystal panel includes:

controlling the fourth switching tubes to be switched on so as to short-circuit the display signal output ends in each group;

controlling the second switching tube and the third switching tube to be switched on so as to enable the reference voltage signal end to be in short circuit with each display signal output end in each group;

and controlling the first switch tube to be switched on so as to synchronously ground the reference voltage signal end and each display signal output end, thereby realizing the release of the charges stored in the liquid crystal panel.

It should be noted that details not disclosed in the discharging method of the liquid crystal panel discharging circuit in the embodiment of the present disclosure refer to details disclosed in the liquid crystal panel discharging circuit in the embodiment of the present disclosure, and detailed description thereof is omitted here.

In summary, in the discharge method of the discharge circuit of the liquid crystal panel according to the embodiment of the disclosure, the shutdown action is determined to be started, and the first switch modules, the second switch modules, and the third switch modules are controlled, so as to release the charges stored in the liquid crystal panel. Therefore, when the shutdown action is determined to be started, the method can enable the reference voltage signal end and the display signal output end to synchronously discharge to the ground when no voltage difference exists between the reference voltage signal end and the display signal output end through controlling the first switch modules, the second switch modules and the third switch modules, and therefore the problem of screen flashing of the display screen can be avoided.

Based on the above embodiment, the present disclosure further provides a display chip, which includes the above liquid crystal panel discharge circuit.

According to the display chip of the embodiment of the disclosure, through the liquid crystal panel discharge circuit, through the control of each first switch module, each second switch module and each third switch module, the reference voltage signal end and the display signal output end can be synchronously discharged to the ground when no voltage difference exists between the reference voltage signal end and the display signal output end, so that the problem of screen flashing of the display screen can be avoided.

Based on the above embodiment, the present disclosure also provides an electronic device, which includes the above display chip.

The electronic device can be a television, a computer, a mobile phone and the like.

According to the electronic device provided by the embodiment of the disclosure, through the display chip, through the control of each first switch module, each second switch module and each third switch module, the reference voltage signal end and the display signal output end can synchronously discharge to the ground when no voltage difference exists between the reference voltage signal end and the display signal output end, so that the problem of screen flashing of the display screen can be avoided.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

In addition, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried out in the method for implementing the above embodiment may be implemented by hardware that is related to instructions of a program, and the program may be stored in a computer readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiment.

In addition, functional units in the embodiments of the present disclosure may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure, and that changes, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present disclosure.

Claims (12)

1. A liquid crystal panel discharge circuit, comprising:

a plurality of first switch modules, a first end of each of the first switch modules being connected to a reference voltage signal terminal, and a second end of each of the first switch modules being grounded;

a plurality of second switch modules, a first end of each of the second switch modules being connected to a first end of a corresponding one of the first switch modules;

a plurality of third switch modules, a first end of each of the third switch modules being connected to a second end of the corresponding second switch module, and each second end of each of the third switch modules being connected to each display signal output end in the corresponding group;

the controller is connected with the third end of each first switch module, the third end of each second switch module, the third end of each third switch module and the fourth end of each third switch module, and is used for determining the start of shutdown actions and controlling each first switch module, each second switch module and each third switch module so as to release charges stored in the liquid crystal panel.

2. The discharge circuit of claim 1, wherein the first switching module comprises:

a first resistor, a first end of the first resistor being a first end of the first switch module;

and the first end of each first switch tube is connected with the second end of the first resistor, the second end of each first switch tube is connected with the second end of the first switch module and then used as the second end of the first switch module, and the control end of each first switch tube is connected and then used as the third end of the first switch module.

3. The discharge circuit of claim 1, wherein the second switching module comprises:

a second resistor, a first end of the second resistor being a first end of the second switch module;

and a first end of the second switching tube is connected with a second end of the second resistor, a second end of the second switching tube is used as a second end of the second switching module, and a control end of the second switching tube is used as a third end of the second switching module.

4. The discharge circuit of claim 3, wherein a width of a trace between the first terminal of the second resistor and the reference voltage signal terminal ranges from [18 μm,22 μm ].

5. The discharge circuit of claim 1, wherein the third switching module comprises:

a first switch unit, a first end of which is used as a first end of the third switch module, and a control end of which is used as a third end of the third switch module;

and a first end of the second switch unit is connected with a second end of the first switch unit, each second end of the second switch unit is used as each second end of the third switch module, and each control end of the second switch unit is connected and then used as a fourth end of the third switch module.

6. The discharge circuit of claim 5, wherein the first switching unit comprises:

and a first end of the third switching tube is used as a first end of the first switching unit, a second end of the third switching tube is used as a second end of the first switching unit, and a control end of the third switching tube is used as a third end of the first switching unit.

7. The discharge circuit of claim 5, wherein the second switching unit comprises:

a plurality of fourth switching tubes, wherein a first end of each fourth switching tube is connected to serve as a first end of the second switching unit;

and a first end of each third resistor is connected with a second end of the corresponding fourth switching tube, and a second end of each third resistor is used as a second end of the second switching unit.

8. The discharge circuit of claim 1, wherein the controller is configured to determine to initiate a shutdown action, and to control each of the first switch module, the second switch module, and the third switch module to release the charges stored in the liquid crystal panel, and the controller is further configured to:

controlling each fourth switching tube to be switched on so as to short-circuit each display signal output end in each group;

controlling the second switching tube and the third switching tube to be switched on so as to enable the reference voltage signal end to be in short circuit with each display signal output end in each group;

and controlling the first switch tube to be switched on so as to synchronously ground the reference voltage signal end and each display signal output end, thereby realizing the release of the charges stored in the liquid crystal panel.

9. A discharge method based on the discharge circuit of the liquid crystal panel according to any one of claims 1 to 8, comprising the steps of:

determining to start a shutdown action;

and controlling the first switch modules, the second switch modules and the third switch modules to release the charges stored in the liquid crystal panel.

10. The discharging method according to claim 9, wherein the controlling each of the first switch module, the second switch module and the third switch module to release the stored charges inside the liquid crystal panel comprises:

controlling the fourth switch tubes to be switched on so as to short-circuit the display signal output ends in each group;

controlling the second switching tube and the third switching tube to be switched on so as to enable the reference voltage signal end to be in short circuit with each display signal output end in each group;

and controlling the first switch tube to be switched on so as to synchronously ground the reference voltage signal end and each display signal output end, thereby realizing the release of the charges stored in the liquid crystal panel.

11. A display chip comprising the liquid crystal panel discharge circuit according to any one of claims 1 to 8.

12. An electronic device comprising the display chip of claim 11.

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