WO2020135021A1 - Overcurrent protection method, display panel, and overcurrent protection apparatus - Google Patents

Abstract

Provided are an overcurrent protection method, an overcurrent protection apparatus, and a display panel. The overcurrent protection method comprises the following steps: acquiring absolute difference values between target maximum current values of each clock control signal within a preset duration; when any absolute difference value is greater than a first preset threshold, turning off a level converter configured to generate each clock control signal; and when each absolute difference value is less than the first preset threshold, controlling the clock control signals to turn on switch devices row by row.

Description

Overcurrent protection method, display panel and overcurrent protection device The

Related application

This application requires the priority of the Chinese patent application with the application number 201811595967.3, entitled "Over-current protection method, display panel and over-current protection device", which was filed on December 25, 2018, and the entire content of which is hereby incorporated by reference.

Technical field

The present application relates to the technical field of display panels, in particular to an overcurrent protection method, a display panel and an overcurrent protection device.

Background technique

Array substrate row drive (Gate Driver On Array, GOA) technology is a kind of thin film transistor (Thin Film Transistor, TFT) gate scanning drive circuit is made on the array substrate to replace the drive chip made by external silicon chip. Since the GOA circuit can be made directly around the panel, the LCD can be lowered (Liquid Crystal The thickness of the panel of Display, LCD) simplifies the manufacturing process, and can reduce product cost and improve the integration of the LCD panel. In the exemplary technology, the application of GOA technology will cause a short circuit in the display panel, causing a problem of screen burning.

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

Summary of the invention

The main purpose of the present application is to provide an over-current protection method, a display panel and an over-current protection device to avoid short circuit in the display panel and cause screen burn.

To achieve the above objective, an overcurrent protection method proposed in this application includes the following steps:

Obtain the target maximum current value of each channel of the clock control signal within a preset duration, wherein one channel of the clock control signal correspondingly controls a row of switching devices to be turned on or off;

Acquiring the absolute value of the difference between the target maximum current values of the clock control signals of different channels;

Determine whether the absolute value of any of the differences is greater than a first preset threshold;

When any of the absolute values of the differences is greater than the first preset threshold, the level shifter set to generate each clock control signal is turned off; and

When the absolute value of each difference is less than the first preset threshold, the clock control signal is controlled to turn on the switching device line by line.

Optionally, after the step of obtaining the target maximum current value of each clock control signal within a preset duration, the method further includes:

Determine whether the target maximum current value is greater than a second preset threshold;

If the target maximum current value of any channel of the clock control signal is greater than the second preset threshold, the level shifter set to generate each channel of the clock control signal is turned off, wherein the second preset threshold is greater than the first preset Threshold; and

If the target maximum current value of each channel of the clock control signal is less than the second preset threshold, the step of obtaining the absolute value of the difference between the target maximum current values of the clock control signal of the different channels is performed.

Optionally, the step of acquiring the target maximum current value of each clock control signal within a preset duration includes:

Obtaining an average current value of multiple maximum current values in multiple clock cycles of each clock control signal; and

Let the average current value be the target maximum current value.

Optionally, the target maximum current value is the maximum current value within one cycle of the clock control signal.

Optionally, the step of obtaining the absolute value of the difference between the target maximum current values of the clock control signals of different channels includes:

Taking the target maximum current value of the clock control signal of any channel as a reference value, the difference between the target maximum current value of the remaining clock control signals of each channel and the reference value is obtained, and the absolute value is obtained for the difference value.

Optionally, the step of obtaining the absolute value of the difference between the target maximum current values of the clock control signals of different channels includes:

Obtain the difference between the target maximum current values of two adjacent clock control signals and obtain the absolute value of the difference.

Optionally, the step of obtaining the absolute value of the difference between the target maximum current values of the clock control signals of different channels includes:

Grouping the clock control signals of different channels sequentially, each group including two channels of the clock control signals; and

Obtain the difference between the target maximum current values of the two clock control signals in each group and find the absolute value of the difference.

Optionally, the step of obtaining the absolute value of the difference between the target maximum current values of the clock control signals of different channels includes:

Obtain the difference between the target maximum current values of each channel of the clock control signal and determine the absolute value of the difference.

Optionally, when any of the absolute values of the differences is greater than the first preset threshold, the step of turning off the level shifter set to generate each clock control signal includes:

When any one of the absolute values of the differences is greater than a first preset threshold, obtain an average value of a plurality of absolute values of the differences; and

It is judged that if the average value of the absolute value of the difference is greater than the first preset threshold, the level shifter set to generate each clock control signal is turned off.

Optionally, when any of the absolute values of the differences is greater than the first preset threshold, the step of turning off the level shifter set to generate each clock control signal includes:

When any absolute value of the difference is greater than a first preset threshold, acquiring a square value of the absolute value of the difference greater than the first preset threshold; and

It is determined that if the square value is greater than the third preset threshold, the level shifter set to generate each clock control signal is turned off; wherein, the third preset threshold is less than the first preset threshold.

Optionally, before the step of controlling the clock control signal to turn on the switching device line by line, the method further includes:

Amplify the current value of the clock control signal and keep the voltage value of the clock control signal unchanged.

Optionally, the first preset threshold is a preset voltage threshold, and when any absolute value of the difference is greater than the first preset threshold, the level shifter configured to generate each clock control signal is turned off The steps include:

Obtaining a voltage value corresponding to the absolute value of each of the differences; and

It is determined that if the voltage value is greater than the preset voltage threshold, the level shifter that generates each clock control signal is turned off.

Optionally, the switching device is a thin film transistor.

To achieve the above purpose, the present application also provides an overcurrent protection method, which includes the following steps:

Obtaining an average current value of multiple maximum current values in multiple clock cycles of each clock control signal, and using the average current value as the target maximum current value;

Using the target maximum current value of any clock control signal as the reference value, find the difference between the target maximum current value of the remaining clock control signals and the reference value, and obtain the absolute value of the difference;

Determine whether the absolute value of any of the differences is greater than a first preset threshold;

When any of the absolute values of the differences is greater than the first preset threshold, the level shifter set to generate each clock control signal is turned off; and

When the absolute value of each difference is less than the first preset threshold, the clock control signal is controlled to turn on the switching device line by line.

Optionally, the step of acquiring the average current value of the plurality of maximum current values in multiple clock cycles of each clock control signal, and using the average current value as the target maximum current value includes:

Determine whether the target maximum current value is greater than a second preset threshold;

If the target maximum current value of any channel of the clock control signal is greater than the second preset threshold, the level shifter set to generate each channel of the clock control signal is turned off, wherein the second preset threshold is greater than the first preset Threshold; and

If the target maximum current value of each channel of the clock control signal is less than the second preset threshold, the target maximum current value of any channel of the clock control signal is used as a reference value to obtain the target of the remaining clock control signals The step of determining the absolute value of the difference between the maximum current value and the reference value.

In order to achieve the above object, the present application also provides a display panel including a timing controller, a level shifter, a current sensor, and a comparator that are electrically connected in sequence. When the display panel is in operation, the following is performed The steps of the overcurrent protection method:

Acquiring the target maximum current value of each clock control signal generated by the timing controller within a preset duration through a current sensor, wherein one clock control signal correspondingly controls a row of switching devices to be turned on or off;

Obtaining the absolute value of the difference between the target maximum current values of the clock control signals of different channels through the comparator;

Judging by the timing controller whether any absolute value of the difference is greater than a first preset threshold;

When any of the absolute values of the differences is greater than the first preset threshold, the timing controller turns off the level shifter set to generate each clock control signal; and

When the absolute value of each difference is less than the first preset threshold, the timing controller controls the clock control signal to turn on the switching device line by line.

Optionally, the display panel further includes an output buffer connected between the level shifter and the switching device, and the buffer is used to amplify the current of the clock control signal to drive The switching device is turned on.

In order to achieve the above object, the present application also provides an overcurrent protection device. The overcurrent protection device includes: a memory, a processor, and an overcurrent protection program stored on the memory and executable on the processor, When the overcurrent protection program is executed by the processor, the following steps are implemented:

Obtain the target maximum current value of each channel of the clock control signal within a preset duration, wherein one channel of the clock control signal correspondingly controls a row of switching devices to be turned on or off;

Acquiring the absolute value of the difference between the target maximum current values of the clock control signals of different channels;

Determine whether the absolute value of any of the differences is greater than a first preset threshold;

When any of the absolute values of the differences is greater than the first preset threshold, the level shifter set to generate each clock control signal is turned off; and

When the absolute value of each difference is less than the first preset threshold, the clock control signal is controlled to turn on the switching device line by line.

In this application, by acquiring the target maximum current value of each clock control signal and acquiring the absolute value of the difference between the target maximum currents of the clock control signals of different channels, when any absolute value of the difference is greater than the first preset threshold, it is closed A level shifter that generates each clock control signal, interrupts the transmission process of the clock control signal, to prevent the display panel from being burned, and controls the display panel when the absolute value of all differences is less than the first preset threshold normal work.

In particular, it should be noted that, in this application, the comparison between the absolute value of the difference between the target maximum current of the different clock control signals and the preset first threshold is used to control whether to turn off the level shifter. In general, since the difference between the target maximum current value of the clock control signal is very small, the absolute value of the difference obtained in theory is 0, so the first preset threshold can be designed to be relatively small. When the clock control signal has a small fluctuation and the absolute value of the difference is greater than the first preset threshold, the level shifter will also be turned off in time to prevent the clock control signal from fluctuating without being detected. Heat is accumulated in the display panel to prevent excessive heat accumulated in the display panel from burning out the display device.

BRIEF DESCRIPTION

In order to more clearly explain the technical solutions in the embodiments or exemplary technologies of the present application, the drawings required for the description of the embodiments or exemplary technologies will be briefly described below. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, without paying any creative work, other drawings can be obtained according to the structures shown in these drawings.

FIG. 1 is a schematic diagram of a terminal structure of a hardware operating environment according to an embodiment of the present invention;

2 is a schematic flowchart of an embodiment of an overcurrent protection method of the present invention;

3 is a schematic flowchart of another embodiment of the overcurrent protection method of the present invention;

4 is a schematic flowchart of another embodiment of the overcurrent protection method of the present invention;

5 is a schematic flowchart of another embodiment of the overcurrent protection method of the present invention;

6 is a schematic flowchart of another embodiment of the overcurrent protection method of the present invention;

7 is a schematic flowchart of another embodiment of the overcurrent protection method of the present invention;

8 is a schematic flowchart of another embodiment of the overcurrent protection method of the present invention;

9 is a schematic diagram of the circuit frame of the display panel of the present application.

The implementation, functional characteristics and advantages of the present application will be further described in conjunction with the embodiments and with reference to the drawings.

detailed description

It should be understood that the specific embodiments described herein are only used to explain the present application, and are not intended to limit the present application.

The main solutions of the embodiments of this application are:

Obtain the target maximum current value of each channel of the clock control signal within a preset duration, wherein one channel of the clock control signal correspondingly controls a row of switching devices to be turned on or off;

Acquiring the absolute value of the difference between the target maximum current values of the clock control signals of different channels;

Determine whether the absolute value of any of the differences is greater than a first preset threshold;

When the absolute value of any of the differences is greater than the first preset threshold, the level shifter set to generate each clock control signal is turned off;

When the absolute value of each difference is less than the first preset threshold, the clock control signal is controlled to turn on the switching device line by line.

In the exemplary technology, the application of GOA technology will cause a short circuit in the display panel, causing a problem of screen burning.

This application obtains the target maximum current value of each clock control signal and obtains the absolute value of the difference between the target maximum currents of different clock control signals. When any absolute value of the difference is greater than the first preset threshold, the A level shifter of a clock control signal, interrupting the transmission process of the clock control signal to prevent the display panel from being burnt out, and controlling the display panel to work normally when the absolute value of all differences is less than the first preset threshold .

In particular, it should be noted that, in this application, the comparison between the absolute value of the difference between the target maximum current of the different clock control signals and the preset first threshold is used to control whether to turn off the level shifter. In general, since the difference between the target maximum current value of the clock control signal is very small, the absolute value of the difference obtained in theory is 0, so the first preset threshold can be designed to be relatively small. When the clock control signal has a small fluctuation and the absolute value of the difference is greater than the first preset threshold, the level shifter will also be turned off in time to prevent the clock control signal from having a small fluctuation and not being detected. The heat accumulated in the display panel prevents excessive heat accumulated in the display panel from burning out the display device.

As shown in FIG. 1, FIG. 1 is a schematic diagram of a terminal structure of a hardware operating environment involved in a solution of an embodiment of the present application.

In this embodiment of the present application, the terminal may be a PC, or may be a mobile terminal device with a display function, such as a smart phone, a tablet computer, or a portable computer.

As shown in FIG. 1, the terminal may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. Among them, the communication bus 1002 is configured to implement connection communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as disk storage. The memory 1005 may optionally be a storage device independent of the foregoing processor 1001.

A person skilled in the art may understand that the terminal structure shown in FIG. 1 does not constitute a limitation on the terminal, and may include more or less components than those illustrated, or combine certain components, or have different component arrangements.

As shown in FIG. 1, the memory 1005 as a computer storage medium may include an operating system, a network communication module, a user interface module, and an overcurrent protection program.

In the terminal shown in FIG. 1, the network interface 1004 is mainly configured to connect to a background server and perform data communication with the background server; the user interface 1003 is mainly configured to connect to a client (user side) and perform data communication with the client; and the processor 1001 can be set to call the overcurrent protection program stored in the memory 1005 and perform the following operations:

Obtain the target maximum current value of each channel of the clock control signal within a preset duration, wherein one channel of the clock control signal correspondingly controls a row of switching devices to be turned on or off;

Acquiring the absolute value of the difference between the target maximum current values of the clock control signals of different channels;

Determine whether the absolute value of any of the differences is greater than a first preset threshold;

When the absolute value of any of the differences is greater than the first preset threshold, the level shifter set to generate each clock control signal is turned off;

When the absolute value of each difference is less than the first preset threshold, the clock control signal is controlled to turn on the switching device line by line.

Further, the processor 1001 can call the overcurrent protection program stored in the memory 1005, and also perform the following operations:

Determine whether the target maximum current value is greater than a second preset threshold;

If the target maximum current value of any of the clock control signals is greater than the second preset threshold, the level shifter set to generate each clock control signal is turned off;

If the target maximum current value of each channel of the clock control signal is less than the second preset threshold, the step of obtaining the absolute value of the difference between the target maximum current values of the clock control signal of the different channels is performed.

Further, the processor 1001 can call the overcurrent protection program stored in the memory 1005, and also perform the following operations:

Obtaining an average current value of multiple maximum current values within multiple clock cycles of each clock control signal;

Let the average current value be the target maximum current value.

Further, the processor 1001 can call the overcurrent protection program stored in the memory 1005, and also perform the following operations:

When any absolute value of the difference is greater than a first preset threshold, obtain an average value of a plurality of absolute values of the differences;

It is determined that if the average value of the absolute value of the difference is greater than the first preset threshold, the level shifter configured to generate each clock control signal is turned off.

Further, the processor 1001 can call the overcurrent protection program stored in the memory 1005, and also perform the following operations:

When any absolute value of the difference is greater than a first preset threshold, obtain a square value of the absolute value of the difference greater than the first preset threshold;

Judging that if the square value is greater than the third preset threshold, the level shifter set to generate each clock control signal is turned off;

The third preset threshold is less than the first preset threshold.

Further, the processor 1001 can call the overcurrent protection program stored in the memory 1005, and also perform the following operations:

Amplify the current value of the clock control signal and keep the voltage value of the clock control signal unchanged.

Further, the processor 1001 can call the overcurrent protection program stored in the memory 1005, and also perform the following operations:

Acquiring a voltage value corresponding to each absolute value of the difference;

It is determined that if the voltage value is greater than the preset voltage threshold, the level shifter that generates each clock control signal is turned off.

Referring to FIG. 2, as an embodiment of the overcurrent protection method of the present application, the overcurrent protection method includes the following steps:

S10. Obtain a target maximum current value of each channel of the clock control signal within a preset time period, where one channel of the clock control signal correspondingly controls a row of switching devices to be turned on or off.

In this embodiment, the clock control signal is Shifter), each of the level shifters generates one channel of the clock control signal, and one channel of the clock control signal corresponds to controlling a row of switching devices on or off, for example, when the clock control signal is directed to the corresponding row of switching devices When a high level is output, the switching device of the corresponding row is turned on, and when the clock control signal outputs a low level to the switching device of the corresponding row, the switching device of the corresponding row is turned off.

Before the level shifter transfers the generated clock control signal to the corresponding row of switching devices for control, the current value of the clock control signal is sensed by the current sensor at any time or at a preset sampling point, And obtain the target maximum current value from the current value. The target maximum current value may be a maximum current value within one cycle of the clock control signal, or may be an average value of multiple maximum current values corresponding to multiple cycles of one clock control signal. Optionally, the switching device is a thin film transistor.

S20. Obtain the absolute value of the difference between the target maximum current values of the clock control signals of different channels.

In this embodiment, the target maximum current value of any clock control signal of any channel may be used as a reference value to obtain the difference between the target maximum current value of the remaining clock control signals of each channel and the reference value, such as 4 clocks Control signal CLK-1 in, CLK-2 in, CLK-3 in, CLK-4 in as an example, assuming CLK-1 in, CLK-2 in, CLK-3 in, CLK-4 The target maximum current values of in are CLK-1-Imax, CLK-2-Imax, CLK-3-Imax, and CLK-4-Imax, with CLK-1 The target maximum current value corresponding to in is the reference value, and the difference between the target maximum current values CLK-2-Imax, CLK-3-Imax and CLK-4-Imax of the remaining clock control signals and the reference value is obtained, then Have:

Difference A=CLK-1-Imax-CLK-2-Imax;

Difference B=CLK-1-Imax-CLK-3-Imax;

Difference C=CLK-1-Imax-CLK-4-Imax;

It can be understood that any one of CLK-2-Imax, CLK-3-Imax, and CLK-4-Imax may be used as a reference value, and then the reference value and the target maximum current value of the remaining clock control signals may be obtained.

In this embodiment, the difference may also be obtained by comparing the target maximum current values of two adjacent clock control signals, such as:

Difference D=CLK-1-Imax-CLK-2-Imax;

Difference E=CLK-2-Imax-CLK-3-Imax;

Difference F=CLK-3-Imax-CLK-4-Imax;

Or, the target maximum current value of the clock control signal whose difference has been calculated is not repeatedly calculated, such as:

Difference G=CLK-1-Imax-CLK-2-Imax;

Difference H=CLK-3-Imax-CLK-4-Imax;

Or, calculate the difference between the target maximum current value of the clock control signal two by two, such as

Difference I=CLK-1-Imax-CLK-2-Imax;

Difference J=CLK-1-Imax-CLK-3-Imax;

Difference K = CLK-1 Imax-CLK-3-Imax

Difference L=CLK-2 Imax-CLK-3-Imax;

Difference M=CLK-2-Imax-CLK-4-Imax;

Difference N=CLK-3-Imax-CLK-4-Imax;

The calculation result of the above difference may be a positive value or a negative value, so all the above differences are taken as absolute values.

S30. Determine whether any absolute value of the difference is greater than a first preset threshold.

In this embodiment, the first preset threshold may be a preset current value or a preset voltage value.

Under normal circumstances, the difference between the target maximum current value of the clock control signal is very small, and the absolute value of the difference obtained in theory is 0, so the first preset threshold can be designed to be relatively small, such as can be set It is 0.1V, 0.2V, 0.5V, etc.

S40. When any absolute value of the difference is greater than the first preset threshold, turn off the level shifter configured to generate each clock control signal.

In this embodiment, when the absolute value of the difference is greater than the first preset threshold, such as the difference A, B, C, D, E, F, G, H, I, J, K, L, M When the absolute value of any difference of N is greater than the first preset threshold, it is proved that one of the two clock control signals corresponding to the absolute value of the difference has a larger target maximum current value, and the larger The target maximum current value may be caused by a short circuit in the display panel. Even if it is not caused by a short circuit in the display panel, the larger target maximum current value may cause heat accumulation in the display panel. Short circuit or heat accumulation in the display panel may cause the display panel Burnout, therefore, when any of the absolute values of the difference is greater than the first preset threshold, the level shifter set to generate each clock control signal is promptly closed, and the clock signal is interrupted to continue the transmission process to the display panel To effectively prevent the display panel from being burned.

S50. When each absolute value of the difference is less than a first preset threshold, control the clock control signal to turn on the switching device line by line.

In this embodiment, if each of the differences is less than the first preset threshold, it proves that there is no short circuit in the display panel or that there is no fluctuation in any clock signal, and the display panel is not at risk of being burned at this time. Therefore, the clock control signal is controlled to turn on the switching device line by line to realize the normal display function of the display panel.

In summary, in this application, by obtaining the target maximum current value of each clock control signal and obtaining the absolute value of the difference between the target maximum currents of different clock control signals, the absolute value of any difference is greater than the first preset threshold , The level shifter that generates each clock control signal is turned off, the transmission process of the clock control signal is interrupted, and the display panel is prevented from being burned. When all the absolute values of the differences are less than the first preset threshold, the control The display panel described above works normally.

In particular, it should be noted that, in this application, the comparison between the absolute value of the difference between the target maximum current of the different clock control signals and the preset first threshold is used to control whether to turn off the level shifter. In general, since the difference between the target maximum current value of the clock control signal is very small, the absolute value of the difference obtained in theory is 0, so the first preset threshold can be designed to be relatively small. When the clock control signal has a small fluctuation and the absolute value of the difference is greater than the first preset threshold, the level shifter will also be turned off in time to prevent the clock control signal from having a small fluctuation and not being detected. The heat accumulated in the display panel prevents excessive heat accumulated in the display panel from burning out the display device.

Referring to FIG. 3, as another embodiment of the overcurrent protection method of the present application, after step S10, the method further includes:

S60. Determine whether the target maximum current value is greater than a second preset threshold;

S70. If the target maximum current value of any clock control signal in any way is greater than the second preset threshold, turn off the level shifter set to generate each clock control signal;

If the target maximum current value of each clock control signal is less than the second preset threshold, step S20 is continued.

In this embodiment, the second preset threshold may be a preset current value or a preset voltage value.

After acquiring the target maximum current value of each clock control signal, first determine whether a target maximum current value is greater than a second preset threshold, and the second preset threshold is greater than the first preset threshold. If the target maximum current value of one clock control signal is greater than the second preset threshold, the level shifter set to generate each clock control signal is directly turned off without acquiring the target maximum current of the clock control signal of a different path The absolute value of the difference between the values is then compared with the first preset threshold, thereby simplifying the processing process and increasing the processing speed.

Referring to FIG. 4, as another embodiment of the overcurrent protection method of the present application, the step S10 includes:

S11: Obtain an average current value of multiple maximum current values in multiple clock cycles of each clock control signal;

S12. Use the average current value as the target maximum current value.

In this embodiment, when the target maximum current value is the maximum current value within one cycle of the clock signal, a misjudgment will occur and turning off the level shifter will cause the display panel to not work normally, so this implementation For example, the average current value of multiple maximum current values in multiple clock cycles of each clock control signal is obtained, and the average current value is used as the target maximum current value. If the absolute value of the difference between the average current value of the maximum current value and the first preset threshold is still greater than the first preset threshold, it may be determined that a short circuit or heat accumulation has occurred in the display panel, thereby avoiding the occurrence of a misjudgment.

Referring to FIG. 5, as another embodiment of the overcurrent protection method of the present application, the step S40 includes:

S41. When any absolute value of the difference is greater than a first preset threshold, obtain an average value of a plurality of absolute values of the differences;

S42. Determine that if the average value of the absolute value of the difference is greater than the first preset threshold, turn off the level shifter configured to generate each clock control signal.

In this embodiment, when only one of the absolute values of the difference is greater than the first preset threshold, the absolute value of the difference may be caused by load fluctuations in the display panel and may cause a misjudgment and close the level shifter. As a result, the display panel cannot work normally, so in this embodiment, the average value of the plurality of absolute values of the differences is obtained, and the average value and the third preset threshold are used to judge the size. When there is only one larger difference When the absolute value of the value is greater than the other absolute values of the differences due to load fluctuations, the average value of all the absolute values of the differences must be less than the first preset threshold. The panel works normally to avoid misjudgment.

If it is judged that the average value of the absolute value of the difference is still greater than the first preset threshold, this situation is most likely caused by a short circuit in the display panel, and then the level shifter set to generate each clock control signal is turned off. The display panel is protected.

Referring to FIG. 6, as another embodiment of the overcurrent protection method of the present application, the step S40 includes:

S43. When any of the absolute values of the difference is greater than the first preset threshold, obtain a square value of the absolute value of the differences greater than the first preset threshold;

S44. Determine that if the squared value is greater than the third preset threshold, turn off the level shifter configured to generate each clock control signal; wherein the third preset threshold is less than the first preset threshold.

In this embodiment, the third preset threshold may be a preset current value or a preset voltage value.

Since the absolute value of the difference is generally less than 1, the square value of the absolute value of the difference will be smaller, and the square value of the smaller absolute value of the difference will be removed from the third preset threshold less than the first preset threshold Compare to determine whether to turn off the level shifter. Since the third preset threshold is less than the first preset threshold, the third preset threshold can be The smaller fluctuations in the display panel can be used to turn off the level shifter to more sensitively avoid the screen burning problem caused by heat accumulation.

Referring to FIG. 7, as another embodiment of the overcurrent protection method of the present application, before step S50, the method further includes:

S80: Amplify the current value of the clock control signal and keep the voltage value of the clock control signal unchanged.

In this embodiment, through the output buffer (Out Buffer) to amplify the current value of the clock control signal signal to enhance the driving capability of the clock signal to drive the switching device to turn on line by line, while keeping the voltage value of the clock control signal unchanged, that is, to maintain the The voltage value of the clock control signal is the turn-on voltage of the switching device.

Referring to FIG. 8, as another embodiment of the overcurrent protection method of the present application, the first preset threshold is a preset voltage threshold, The step S40 includes:

S45, obtaining a voltage value corresponding to each of the differences;

S46. Determine that if the voltage value is greater than the preset voltage threshold, turn off the level shifter that generates each clock control signal.

In this embodiment, since the first preset threshold is generally set to a voltage value, and the difference is the difference between the target maximum current, the difference is also the current value, so it is necessary to The difference value is converted into a current value for comparison with the preset voltage threshold. In this embodiment, each difference value is mirrored by a mirror current source to obtain a mirror current, and the difference value is obtained according to the mirror current Corresponding voltage value, and compare the voltage value with the preset voltage threshold to determine whether to turn off the level shifter that generates each clock control signal.

9, in addition, the present application also provides a display panel, the display panel includes a timing controller 10, a level shifter 20, a current sensor 30 and a comparator 40 electrically connected in sequence, the display panel During operation, perform the following steps of the overcurrent protection method:

Obtain the target maximum current value of each clock control signal generated by the timing controller 10 within a preset duration through the current sensor 30, wherein one clock control signal correspondingly controls a row of switching devices to be turned on or off;

Obtain the absolute value of the difference between the target maximum current values of the clock control signals of different paths through the comparator 40;

Determine whether the absolute value of any of the differences is greater than a first preset threshold;

When the absolute value of any of the differences is greater than the first preset threshold, the timing controller 10 turns off the level shifter 20 configured to generate each clock control signal;

When the absolute value of each difference is less than the first preset threshold, the timing controller controls the clock control signal to turn on the switching device line by line.

In addition, the current value of the clock control signal signal is amplified by the output buffer 50 to enhance the driving capability of the clock signal to drive the switching device to turn on line by line, while keeping the voltage value of the clock control signal unchanged, That is, the voltage value of the clock control signal is maintained at the turn-on voltage of the switching device.

In addition, the present application also provides an overcurrent protection device. The overcurrent protection device includes: a memory, a processor, and an overcurrent protection program stored on the memory and executable on the processor. When the stream protection program is executed by the processor, the following steps are implemented:

Obtain the target maximum current value of each channel of the clock control signal within a preset duration, wherein one channel of the clock control signal correspondingly controls a row of switching devices to be turned on or off;

Acquiring the absolute value of the difference between the target maximum current values of the clock control signals of different channels;

Determine whether the absolute value of any of the differences is greater than a first preset threshold;

When the absolute value of any of the differences is greater than the first preset threshold, the level shifter set to generate each clock control signal is turned off;

When the absolute value of each difference is less than the first preset threshold, the clock control signal is controlled to turn on the switching device line by line.

The above is only an optional embodiment of the present application, and does not limit the scope of the patent of the present application. Any equivalent structural transformation made by the description and drawings of the present application, or direct/indirect under the application concept of the present application Applications in other related technical fields are included in the scope of patent protection of this application.

Claims (18)

1. An overcurrent protection method, wherein the overcurrent protection method includes the following steps:

   Obtain the target maximum current value of each channel of the clock control signal within a preset duration, wherein one channel of the clock control signal correspondingly controls a row of switching devices to be turned on or off;

   Acquiring the absolute value of the difference between the target maximum current values of the clock control signals of different channels;

   Determine whether the absolute value of any of the differences is greater than a first preset threshold;

   When any of the absolute values of the differences is greater than the first preset threshold, the level shifter set to generate each clock control signal is turned off; and

   When the absolute value of each difference is less than the first preset threshold, the clock control signal is controlled to turn on the switching device line by line.
2. The overcurrent protection method according to claim 1, wherein after the step of acquiring the target maximum current value of each clock control signal within a preset duration, further comprising:

   Determine whether the target maximum current value is greater than a second preset threshold;

   If the target maximum current value of any channel of the clock control signal is greater than the second preset threshold, the level shifter set to generate each channel of the clock control signal is turned off, wherein the second preset threshold is greater than the first preset Threshold; and

   If the target maximum current value of each channel of the clock control signal is less than the second preset threshold, the step of obtaining the absolute value of the difference between the target maximum current values of the clock control signal of the different channels is performed.
3. The overcurrent protection method according to claim 1, wherein the step of acquiring the target maximum current value of each clock control signal within a preset duration includes:

   Obtaining an average current value of multiple maximum current values in multiple clock cycles of each clock control signal; and

   Let the average current value be the target maximum current value.
4. The overcurrent protection method according to claim 1, wherein the target maximum current value is a maximum current value within one cycle of the clock control signal.
5. The overcurrent protection method according to claim 1, wherein the step of acquiring the absolute value of the difference between the target maximum current values of the clock control signals of different paths includes:

   Taking the target maximum current value of the clock control signal of any channel as a reference value, the difference between the target maximum current value of the remaining clock control signals of each channel and the reference value is obtained, and the absolute value is obtained for the difference value.
6. The overcurrent protection method according to claim 1, wherein the step of acquiring the absolute value of the difference between the target maximum current values of the clock control signals of different paths includes:

   Obtain the difference between the target maximum current values of two adjacent clock control signals and obtain the absolute value of the difference.
7. The overcurrent protection method according to claim 1, wherein the step of acquiring the absolute value of the difference between the target maximum current values of the clock control signals of different paths includes:

   Grouping the clock control signals of different channels sequentially, each group including two channels of the clock control signals; and

   Obtain the difference between the target maximum current values of the two clock control signals in each group and find the absolute value of the difference.
8. The overcurrent protection method according to claim 1, wherein the step of acquiring the absolute value of the difference between the target maximum current values of the clock control signals of different paths includes:

   Obtain the difference between the target maximum current values of each channel of the clock control signal and determine the absolute value of the difference.
9. The overcurrent protection method according to claim 1, wherein when any of the absolute values of the difference is greater than a first preset threshold, the step of turning off the level shifter configured to generate each clock control signal includes :

   When any one of the absolute values of the differences is greater than a first preset threshold, obtain an average value of a plurality of absolute values of the differences; and

   It is judged that if the average value of the absolute value of the difference is greater than the first preset threshold, the level shifter set to generate each clock control signal is turned off.
10. The overcurrent protection method according to claim 1, wherein when any of the absolute values of the difference is greater than a first preset threshold, the step of turning off the level shifter configured to generate each clock control signal includes :

    When any absolute value of the difference is greater than a first preset threshold, acquiring a square value of the absolute value of the difference greater than the first preset threshold; and

    It is determined that if the square value is greater than the third preset threshold, the level shifter set to generate each clock control signal is turned off; wherein, the third preset threshold is less than the first preset threshold.
11. The overcurrent protection method according to claim 1, wherein before the step of controlling the clock control signal to turn on the switching device line by line, further comprising:

    Amplify the current value of the clock control signal and keep the voltage value of the clock control signal unchanged.
12. The overcurrent protection method according to claim 1, wherein the first preset threshold is a preset voltage threshold, and when any of the absolute values of the difference is greater than the first preset threshold, the shutdown setting is generated The steps of the level shifter of each clock control signal include:

    Obtaining a voltage value corresponding to the absolute value of each of the differences; and

    It is determined that if the voltage value is greater than the preset voltage threshold, the level shifter that generates each clock control signal is turned off.
13. The overcurrent protection method according to claim 1, wherein the switching device is a thin film transistor.
14. An overcurrent protection method, wherein the overcurrent protection method includes the following steps:

    Obtaining an average current value of multiple maximum current values in multiple clock cycles of each clock control signal, and using the average current value as the target maximum current value;

    Using the target maximum current value of any clock control signal as the reference value, find the difference between the target maximum current value of the remaining clock control signals and the reference value, and obtain the absolute value of the difference;

    Determine whether the absolute value of any of the differences is greater than a first preset threshold;

    When any of the absolute values of the differences is greater than the first preset threshold, the level shifter set to generate each clock control signal is turned off; and

    When the absolute value of each difference is less than the first preset threshold, the clock control signal is controlled to turn on the switching device line by line.
15. The overcurrent protection method according to claim 14, wherein the acquiring an average current value of a plurality of maximum current values within a plurality of clock cycles of each clock control signal, and using the average current value as the The steps after the target maximum current value include:

    Determine whether the target maximum current value is greater than a second preset threshold;

    If the target maximum current value of any channel of the clock control signal is greater than the second preset threshold, the level shifter set to generate each channel of the clock control signal is turned off, wherein the second preset threshold is greater than the first preset Threshold; and

    If the target maximum current value of each channel of the clock control signal is less than the second preset threshold, the target maximum current value of any channel of the clock control signal is used as a reference value to obtain the target of the remaining clock control signals The step of determining the absolute value of the difference between the maximum current value and the reference value.
16. A display panel, wherein the display panel includes a timing controller, a level shifter, a current sensor, and a comparator that are electrically connected in sequence. When the display panel is in operation, the following steps of the overcurrent protection method are performed :

    Acquiring the target maximum current value of each clock control signal generated by the timing controller within a preset duration through a current sensor, wherein one clock control signal correspondingly controls a row of switching devices to be turned on or off;

    Obtaining the absolute value of the difference between the target maximum current values of the clock control signals of different channels through the comparator;

    Judging by the timing controller whether any absolute value of the difference is greater than a first preset threshold;

    When any of the absolute values of the differences is greater than the first preset threshold, the timing controller turns off the level shifter set to generate each clock control signal; and

    When the absolute value of each difference is less than the first preset threshold, the timing controller controls the clock control signal to turn on the switching device line by line.
17. The display panel according to claim 1, wherein the display panel further comprises an output buffer connected between the level shifter and the switching device, the buffer used to amplify the The current of the clock control signal drives the switching device to turn on.
18. An overcurrent protection device, wherein the overcurrent protection device includes: a memory, a processor, and an overcurrent protection program stored on the memory and executable on the processor, and the overcurrent protection program is The execution of the processor realizes the following steps:

    Obtain the target maximum current value of each channel of the clock control signal within a preset duration, wherein one channel of the clock control signal correspondingly controls a row of switching devices to be turned on or off;

    Acquiring the absolute value of the difference between the target maximum current values of the clock control signals of different channels;

    Determine whether the absolute value of any of the differences is greater than a first preset threshold;

    When any of the absolute values of the differences is greater than the first preset threshold, the level shifter set to generate each clock control signal is turned off; and

    When the absolute value of each difference is less than the first preset threshold, the clock control signal is controlled to turn on the switching device line by line.