CN109584829B - Overcurrent protection method, display panel and overcurrent protection device - Google Patents
Overcurrent protection method, display panel and overcurrent protection device Download PDFInfo
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- CN109584829B CN109584829B CN201811595967.3A CN201811595967A CN109584829B CN 109584829 B CN109584829 B CN 109584829B CN 201811595967 A CN201811595967 A CN 201811595967A CN 109584829 B CN109584829 B CN 109584829B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
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Abstract
The application provides an overcurrent protection method, an overcurrent protection device and a display panel, wherein the overcurrent protection method comprises the following steps: acquiring a target maximum current value of each path of clock control signal within a preset time length, wherein one path of clock control signal correspondingly controls a row of switching devices to be turned on or turned off; acquiring difference absolute values between target maximum current values of the clock control signals of different paths; judging whether any difference absolute value is larger than a first preset threshold value; when any difference absolute value is larger than a first preset threshold value, a level converter used for generating each path of clock control signal is closed; and when each difference absolute value is smaller than a first preset threshold value, controlling the clock control signal to open the switching device line by line.
Description
Technical Field
The present disclosure relates to the field of display panel technologies, and in particular, to an overcurrent protection method, a display panel, and an overcurrent protection apparatus.
Background
The Gate Driver On Array (GOA) technology is a technology in which a Gate scan Driver circuit of a Thin Film Transistor (TFT) is fabricated On an Array substrate to replace a Driver chip fabricated from an external silicon chip. The GOA circuit can be directly manufactured around the panel, so that the frame thickness of the panel of a Liquid Crystal Display (LCD) can be reduced, the manufacturing process is simplified, the product cost can be reduced, and the integration level of the LCD panel is improved. In the prior art, the problem of screen burning caused by short circuit of circuits in the display panel can occur by applying the GOA technology.
Content of application
The main purpose of the present application is to provide an overcurrent protection method, a display panel and an overcurrent protection device, which aim to solve the problem of screen burn caused by short circuit of a circuit in the display panel in the prior art.
In order to achieve the above object, the present application provides an overcurrent protection method, which includes the following steps:
acquiring a target maximum current value of each path of clock control signal within a preset time length, wherein one path of clock control signal correspondingly controls a row of switching devices to be turned on or turned off;
acquiring difference absolute values between target maximum current values of the clock control signals of different paths;
judging whether any difference absolute value is larger than a first preset threshold value;
when any difference absolute value is larger than a first preset threshold value, a level converter used for generating each path of clock control signal is closed;
and when each difference absolute value is smaller than a first preset threshold value, controlling the clock control signal to open the switching device line by line.
Optionally, after the step of obtaining the target maximum current value of each clock control signal within the preset time duration, the method further includes:
judging whether the target maximum current value is larger than a second preset threshold value or not;
if the target maximum current value of any one path of the clock control signals is larger than a second preset threshold value, closing a level converter for generating each path of the clock control signals;
and if the target maximum current value of each path of the clock control signal is smaller than a second preset threshold value, executing a step of acquiring the absolute value of the difference value between the target maximum current values of the clock control signals of different paths.
Optionally, the step of obtaining a target maximum current value of each clock control signal within a preset time duration includes:
acquiring an average current value of a plurality of maximum current values in a plurality of clock periods of each path of the clock control signal;
the average current value is taken as the target maximum current value.
Optionally, the step of turning off the level shifter for generating each clock control signal when any of the absolute values of the differences is greater than a first preset threshold includes:
when any difference absolute value is larger than a first preset threshold value, obtaining an average value of a plurality of difference absolute values;
and if the average value of the absolute values of the difference values is larger than a first preset threshold value, closing the level converter for generating each path of clock control signal.
Optionally, the step of turning off the level shifter for generating each clock control signal when any of the absolute values of the differences is greater than a first preset threshold includes:
when any difference absolute value is larger than a first preset threshold, acquiring a square value of the difference absolute value larger than the first preset threshold;
judging whether the square value is larger than a third preset threshold value or not, and closing a level converter for generating each path of clock control signal; wherein the third preset threshold is smaller than the first preset threshold.
Optionally, before the step of controlling the clock control signal to open the switching devices row by row, the method further includes: and amplifying the current value of the clock control signal and keeping the voltage value of the clock control signal unchanged.
Optionally, the first preset threshold is a preset voltage threshold, and the step of turning off a level shifter for generating each clock control signal when any absolute value of the difference is greater than the first preset threshold includes: acquiring a voltage value corresponding to each difference absolute value; and if the voltage value is larger than the preset voltage threshold value, closing the level converter generating each path of clock control signal.
Optionally, the switching device is a thin film transistor.
In addition, the present application further provides a display panel, where the display panel includes a timing controller, a level shifter, a current sensor, and a comparator electrically connected in sequence, and when the display panel is operated, the following steps of the overcurrent protection method are performed:
acquiring a target maximum current value of each path of clock control signal generated by a time schedule controller within a preset time length through a current sensor, wherein one path of clock control signal correspondingly controls a row of switching devices to be switched on or switched off;
obtaining a difference absolute value between target maximum current values of the clock control signals of different paths through the comparator;
judging whether any difference absolute value is larger than a first preset threshold value;
when any difference absolute value is larger than a first preset threshold value, a level converter used for generating each path of clock control signal is closed;
and when each difference absolute value is smaller than a first preset threshold value, controlling the clock control signal to open the switching device line by line.
In addition, this application still provides an overcurrent protection device, overcurrent protection device includes: the overcurrent protection program realizes the following steps when being executed by the processor:
acquiring a target maximum current value of each path of clock control signal within a preset time length, wherein one path of clock control signal correspondingly controls a row of switching devices to be turned on or turned off;
acquiring difference absolute values between target maximum current values of the clock control signals of different paths;
judging whether any difference absolute value is larger than a first preset threshold value;
when any difference absolute value is larger than a first preset threshold value, a level converter used for generating each path of clock control signal is closed;
and when each difference absolute value is smaller than a first preset threshold value, controlling the clock control signal to open the switching device line by line.
This application is through the difference absolute value between the target maximum current value of acquireing every way clock control signal and the target maximum current of acquireing the clock control signal on different ways, when arbitrary difference absolute value is greater than first preset threshold, closes the level shifter who produces every clock control signal, interrupts clock control signal's transfer process avoids display panel is burnt, when all difference absolute values all are less than first preset threshold, controls display panel normally works.
It should be noted that, in the present application, whether the level shifter is turned off is controlled according to the comparison result between the absolute value of the difference between the target maximum currents of the different clock control signals and the preset first threshold, because in general, the difference between the target maximum current values of the clock control signals is very small, and the theoretically obtained absolute value of the difference is 0, the first preset threshold can be designed to be relatively small, when the absolute value of the difference is larger than the first preset threshold due to relatively small fluctuation of a certain clock control signal, the level shifter can also be turned off in time, so as to prevent the clock control signal from being detected due to relatively small fluctuation and accumulating heat in the display panel, and prevent the display device from being burned out due to excessive heat accumulated in the display panel.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating an embodiment of an over-current protection method according to the present invention;
FIG. 3 is a schematic flow chart illustrating an over-current protection method according to another embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a method for over-current protection according to another embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating a method for over-current protection according to another embodiment of the present invention;
FIG. 6 is a schematic flow chart illustrating a method for over-current protection according to another embodiment of the present invention;
FIG. 7 is a schematic flow chart illustrating a method for over-current protection according to another embodiment of the present invention;
fig. 8 is a schematic flow chart of a method for overcurrent protection according to another embodiment of the present invention.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The main solution of the embodiment of the application is as follows:
acquiring a target maximum current value of each path of clock control signal within a preset time length, wherein one path of clock control signal correspondingly controls a row of switching devices to be turned on or turned off;
acquiring difference absolute values between target maximum current values of the clock control signals of different paths;
judging whether any difference absolute value is larger than a first preset threshold value;
when any difference absolute value is larger than a first preset threshold value, a level converter used for generating each path of clock control signal is closed;
and when each difference absolute value is smaller than a first preset threshold value, controlling the clock control signal to open the switching device line by line.
In the prior art, the problem of screen burning caused by short circuit of circuits in the display panel can occur by applying the GOA technology.
This application is through the target maximum current value who obtains every way clock control signal and obtain the difference absolute value between the target maximum current of different ways clock control signal, when arbitrary difference absolute value is greater than first preset threshold, closes the level shifter who produces every clock control signal, the interrupt clock control signal's transfer process avoids display panel is burnt out, when all difference absolute values all are less than first preset threshold, controls display panel normally works.
It should be noted that, since the present application controls whether to turn off the level shifter according to the comparison result between the absolute value of the difference between the target maximum currents of the different clock control signals and the preset first threshold, since the difference between the target maximum current values of the clock control signals is very small under normal conditions, and the theoretically obtained absolute value of the difference is 0, the first preset threshold can be designed to be relatively small, and when the absolute value of the difference is larger than the first preset threshold due to relatively small fluctuation of a certain clock control signal, the level shifter can also be turned off in time, so as to prevent the clock control signal from being detected to accumulate heat in the display panel due to relatively small fluctuation, and prevent the display device from being burned out due to excessive heat accumulated in the display panel.
As shown in fig. 1, fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present application.
The terminal in the embodiment of the application can be a PC, and can also be a mobile terminal device with a display function, such as a smart phone, a tablet computer, a portable computer and the like.
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, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective 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 also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the terminal structure shown in fig. 1 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein 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 used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call the over-current protection program stored in the memory 1005, and perform the following operations:
acquiring a target maximum current value of each path of clock control signal within a preset time length, wherein one path of clock control signal correspondingly controls a row of switching devices to be turned on or turned off;
acquiring difference absolute values between target maximum current values of the clock control signals of different paths;
judging whether any difference absolute value is larger than a first preset threshold value;
when any difference absolute value is larger than a first preset threshold value, a level converter used for generating each path of clock control signal is closed;
and when each difference absolute value is smaller than a first preset threshold value, controlling the clock control signal to open the switching device line by line.
Further, the processor 1001 may call the over-current protection program stored in the memory 1005, and further perform the following operations:
judging whether the target maximum current value is larger than a second preset threshold value or not;
if the target maximum current value of any one path of the clock control signals is larger than a second preset threshold value, closing a level converter for generating each path of the clock control signals;
and if the target maximum current value of each path of the clock control signal is smaller than a second preset threshold value, executing a step of acquiring the absolute value of the difference value between the target maximum current values of the clock control signals of different paths.
Further, the processor 1001 may call the over-current protection program stored in the memory 1005, and further perform the following operations:
acquiring an average current value of a plurality of maximum current values in a plurality of clock periods of each path of the clock control signal;
the average current value is taken as the target maximum current value.
Further, the processor 1001 may call the over-current protection program stored in the memory 1005, and further perform the following operations:
when any difference absolute value is larger than a first preset threshold value, obtaining an average value of a plurality of difference absolute values;
and if the average value of the absolute values of the difference values is larger than a first preset threshold value, closing a level converter for generating each path of clock control signal.
Further, the processor 1001 may call the over-current protection program stored in the memory 1005, and further perform the following operations:
when any difference absolute value is larger than a first preset threshold, acquiring a square value of the difference absolute value larger than the first preset threshold;
judging whether the square value is larger than a third preset threshold value or not, and closing a level converter for generating each path of clock control signal;
wherein the third preset threshold is smaller than the first preset threshold.
Further, the processor 1001 may call the over-current protection program stored in the memory 1005, and further perform the following operations:
and amplifying the current value of the clock control signal and keeping the voltage value of the clock control signal unchanged.
Further, the processor 1001 may call the over-current protection program stored in the memory 1005, and further perform the following operations:
acquiring a voltage value corresponding to each difference absolute value;
and if the voltage value is larger than the preset voltage threshold value, closing the level converter generating each path of clock control signal.
Referring to fig. 2, as an embodiment of the overcurrent protection method of the present application, the overcurrent protection method includes the following steps:
and S10, acquiring a target maximum current value of each path of clock control signal within a preset time length, wherein one path of clock control signal correspondingly controls a row of switching devices to be turned on or turned off.
In this embodiment, the clock control signals are generated by Level shifters (Level shifters), each of the Level shifters generating one of the clock control signals, and one of the clock control signals correspondingly controls one row of switching devices to be turned on or off, for example, when the clock control signal outputs a high Level to the switching devices of the corresponding row, the switching devices of the corresponding row are turned on, and when the clock control signal outputs a low Level to the switching devices of the corresponding row, the switching devices of the corresponding row are turned off.
Before the level shifter transmits the generated clock control signal to the switching devices of the corresponding row for control, a current sensor senses the current value of any time or a preset sampling point of the clock control signal, and a target maximum current value is obtained from the current value. The target maximum current value may be a maximum current value in one period of the clock control signal, or an average value of a plurality of maximum current values corresponding to a plurality of periods of one path of the clock control signal. Optionally, the switching device is a thin film transistor.
And S20, acquiring the absolute value of the difference between the target maximum current values of the clock control signals of different paths.
In this embodiment, the target maximum current values of any one of the clock control signals may be used as a reference value, and the difference between the target maximum current values of the remaining clock control signals and the reference value may be obtained, for example, by taking 4 clock control signals CLK-1in, CLK-2in, CLK-3in, and CLK-4in as examples, assuming that the target maximum current values of CLK-1in, CLK-2in, CLK-3in, and CLK-4in are CLK-1-Imax, CLK-2-Imax, CLK-3-Imax, and CLK-4-Imax, respectively, and taking the target maximum current value corresponding to CLK-1in as a reference value, obtaining the difference between the target maximum current values of the remaining clock control signals CLK-2-Imax, CLK-3-Imax, and CLK-4-Imax and the reference value, then there are:
the difference A is CLK-1-Imax-CLK-2-Imax;
the difference B is CLK-1-Imax-CLK-3-Imax;
the difference C is CLK-1-Imax-CLK-4-Imax;
it is understood that any one of CLK-2-Imax, CLK-3-Imax, and CLK-4-Imax may be used as a reference value, and the reference value and the target maximum current value of each of the remaining clock control signals may be further determined.
In this embodiment, the difference may also be obtained by comparing target maximum current values of two adjacent clock control signals, such as:
the difference D is CLK-1-Imax-CLK-2-Imax;
the difference E is CLK-2-Imax-CLK-3-Imax;
the difference F is CLK-3-Imax-CLK-4-Imax;
alternatively, the target maximum current value of the clock control signal for which the difference has been calculated is not repeatedly calculated, such as:
the difference G-CLK-1-Imax-CLK-2-Imax;
the difference H is CLK-3-Imax-CLK-4-Imax;
alternatively, the target maximum current values of the clock control signals are differenced by two, e.g. by
The difference I is CLK-1-Imax-CLK-2-Imax;
the difference J is CLK-1-Imax-CLK-3-Imax;
the difference K is CLK-1Imax-CLK-3-Imax
The difference L is CLK-2 Imax-CLK-3-Imax;
the difference M is CLK-2-Imax-CLK-4-Imax;
the difference N is CLK-3-Imax-CLK-4-Imax;
the calculation result of the difference may be a positive value or a negative value, so the absolute values of the differences are taken.
And S30, judging whether the absolute value of any difference value is larger than a first preset threshold value.
In this embodiment, the first preset threshold may be a preset current value or a preset voltage value.
Under normal conditions, the difference between the target maximum current values of the clock control signals is very small, and the theoretically obtained absolute value of the difference is 0, so the first preset threshold value can be designed to be relatively small, such as being set to be 0.1V, 0.2V, 0.5V, and the like.
And S40, when the absolute value of any difference value is larger than a first preset threshold value, closing the level converter for generating each clock control signal.
In this embodiment, when the absolute value of the difference is greater than the first preset threshold, if the absolute value of any difference of the difference A, B, C, D, E, F, G, H, I, J, K, L, M, 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 target maximum current value may be caused by an internal short circuit of the display panel, and even if the internal short circuit of the display panel is not caused, the larger target maximum current value may cause heat accumulation of the display panel, and the internal short circuit or heat accumulation of the display panel may cause burning-out of the display panel, so that when any absolute value of the difference is greater than the first preset threshold, the level shifter for generating each clock control signal is timely turned off, and the clock signal is interrupted to continue to be transmitted to the display panel, the display panel is effectively prevented from being burnt.
And S50, when each absolute value of the difference is smaller than a first preset threshold, controlling the clock control signal to open the switch device row by row.
In this embodiment, if each of the difference values is smaller than the first preset threshold, it is verified that there is no short circuit in the display panel or there is no fluctuation in any one of the clock signals, and at this time, the display panel is not burned, so that the clock control signal is controlled to turn on the switching device line by line, thereby implementing the normal display function of the display panel.
To sum up, this application closes the level shifter who produces every clock control signal when arbitrary difference absolute value is greater than first preset threshold value through the difference absolute value between the target maximum current who obtains every way clock control signal and obtain different way clock control signal's target maximum current, interrupts clock control signal's transfer process avoids display panel is burnt, when all difference absolute values all are less than first preset threshold value, controls display panel normally works.
It should be noted that, since the present application controls whether to turn off the level shifter according to the comparison result between the absolute value of the difference between the target maximum currents of the different clock control signals and the preset first threshold, since the difference between the target maximum current values of the clock control signals is very small under normal conditions, and the theoretically obtained absolute value of the difference is 0, the first preset threshold can be designed to be relatively small, and when the absolute value of the difference is larger than the first preset threshold due to relatively small fluctuation of a certain clock control signal, the level shifter can also be turned off in time, so as to prevent the clock control signal from being detected to accumulate heat in the display panel due to relatively small fluctuation, and prevent the display device from being burned out due to excessive heat accumulated in the display panel.
Referring to fig. 3, as another embodiment of the overcurrent protection method of the present application, after step S10, the method further includes:
s60, judging whether the target maximum current value is larger than a second preset threshold value;
s70, if the target maximum current value of any path of clock control signal is larger than a second preset threshold value, closing a level converter for generating each path of clock control signal;
and if the target maximum current value of each clock control signal is smaller than a second preset threshold, continuing to execute step S20.
In this embodiment, the second preset threshold may be a preset current value or a preset voltage value.
After the target maximum current value of each clock control signal is obtained, whether the target maximum current value is larger than a second preset threshold value is judged, the second preset threshold value is larger than a first preset threshold value, if the target maximum current value of any one clock control signal is larger than the second preset threshold value, a level converter used for generating each clock control signal is directly closed, and the absolute value of the difference value between the target maximum current values of the clock control signals of different paths is not required to be obtained and then is compared with the first preset threshold value, so that the processing process is simplified, and the processing speed is improved.
Referring to fig. 4, as another embodiment of the overcurrent protection method of the present application, the step S10 includes:
s11, obtaining the average current value of a plurality of maximum current values in a plurality of clock cycles of each path of clock control signal;
s12, the average current value is set as the target maximum current value.
In this embodiment, when the target maximum current value is the maximum current value in one period of the clock signal, an erroneous determination may occur and the level shifter is turned off, which may cause the display panel to fail to operate normally.
Referring to fig. 5, as another embodiment of the overcurrent protection method of the present application, the step S40 includes:
s41, when any difference absolute value is larger than a first preset threshold value, obtaining an average value of a plurality of difference absolute values;
and S42, judging whether the absolute value average of the difference values is larger than a first preset threshold value, and closing a level converter for generating each path of clock control signal.
In this embodiment, when only one of the absolute difference values is greater than the first preset threshold, the absolute difference value may be an error determination caused by load fluctuation in the display panel and the level shifter is turned off, so that the display panel cannot normally operate.
And if the average value of the absolute values of the difference values is judged to be still larger than the first preset threshold value, the situation is most likely to be caused by short circuit in the display panel, and the level converter for generating each path of clock control signal is closed to protect the display panel.
Referring to fig. 6, as another embodiment of the overcurrent protection method of the present application, the step S40 includes:
s43, when any difference absolute value is larger than a first preset threshold value, obtaining a square value of the difference absolute value larger than the first preset threshold value;
s44, judging whether the square value is larger than a third preset threshold value, and closing a level converter for generating each path of clock control signal; wherein the third preset threshold is smaller than the first preset threshold.
In this embodiment, the third preset threshold may be a preset current value or a preset voltage value.
Because the absolute value of the difference is generally smaller than 1, the square value of the absolute value of the difference is smaller, and the square value of the smaller absolute value of the difference is compared with a third preset threshold smaller than the first preset threshold, so as to judge whether to close the level shifter.
Referring to fig. 7, as another embodiment of the overcurrent protection method of the present application, before step S50, the method further includes:
and S80, amplifying the current value of the clock control signal and keeping the voltage value of the clock control signal unchanged.
In this embodiment, the current value of the clock control signal is amplified by an output Buffer (Out Buffer), so as to enhance the driving capability of the clock signal to drive the switching devices to be turned on line by line, and simultaneously, the voltage value of the clock control signal is kept unchanged, that is, the voltage value of the clock control signal is kept as the turn-on voltage of the switching devices.
Referring to fig. 8, as another embodiment of the method for overcurrent protection of the present application, the first preset threshold is a preset voltage threshold, and the step S40 includes:
s45, acquiring a voltage value corresponding to each difference value;
and S46, judging whether the voltage value is larger than the preset voltage threshold value, and closing the level converter generating each path of clock control signal.
In this embodiment, since the first preset threshold is generally set as a voltage value, and the difference is a difference between target maximum currents, the difference is also a current value, and therefore, the difference needs to be converted into a current value to be compared with the preset voltage threshold.
In addition, the present application further provides a display panel, where the display panel includes a timing controller, a level shifter, a current sensor, and a comparator electrically connected in sequence, and when the display panel is operated, the following steps of the overcurrent protection method are performed:
acquiring a target maximum current value of each path of clock control signal generated by a time schedule controller within a preset time length through a current sensor, wherein one path of clock control signal correspondingly controls a row of switching devices to be switched on or switched off;
obtaining a difference absolute value between target maximum current values of the clock control signals of different paths through the comparator;
judging whether any difference absolute value is larger than a first preset threshold value;
when any difference absolute value is larger than a first preset threshold value, a level converter used for generating each path of clock control signal is closed;
and when each difference absolute value is smaller than a first preset threshold value, controlling the clock control signal to open the switching device line by line.
In addition, this application still provides an overcurrent protection device, overcurrent protection device includes: the overcurrent protection program realizes the following steps when being executed by the processor:
acquiring a target maximum current value of each path of clock control signal within a preset time length, wherein one path of clock control signal correspondingly controls a row of switching devices to be turned on or turned off;
acquiring difference absolute values between target maximum current values of the clock control signals of different paths;
judging whether any difference absolute value is larger than a first preset threshold value;
when any difference absolute value is larger than a first preset threshold value, a level converter used for generating each path of clock control signal is closed;
and when each difference absolute value is smaller than a first preset threshold value, controlling the clock control signal to open the switching device line by line.
The above description is only an alternative embodiment of the present application, and not intended to limit the scope of the present application, and all modifications and equivalents of the subject matter of the present application, which are made by the following claims and their equivalents, or which are directly or indirectly applicable to other related arts, are intended to be included within the scope of the present application.
Claims (10)
1. An overcurrent protection method is characterized by comprising the following steps:
acquiring a target maximum current value of each path of clock control signal within a preset time length, wherein one path of clock control signal correspondingly controls a row of switching devices to be turned on or turned off;
acquiring difference absolute values between target maximum current values of the clock control signals of different paths;
judging whether any difference absolute value is larger than a first preset threshold value;
when any difference absolute value is larger than a first preset threshold value, a level converter used for generating each path of clock control signal is closed;
and when each difference absolute value is smaller than a first preset threshold value, controlling the clock control signal to open the switching device line by line.
2. The overcurrent protection method according to claim 1, wherein after the step of obtaining the target maximum current value of each clock control signal within a preset time period, the method further comprises:
judging whether the target maximum current value is larger than a second preset threshold value or not;
if the target maximum current value of any one path of the clock control signals is larger than a second preset threshold value, closing a level converter for generating each path of the clock control signals;
and if the target maximum current value of each path of the clock control signal is smaller than a second preset threshold value, executing a step of acquiring the absolute value of the difference value between the target maximum current values of the clock control signals of different paths.
3. The overcurrent protection method according to claim 1, wherein the step of obtaining the target maximum current value of each clock control signal within a preset time period comprises:
acquiring an average current value of a plurality of maximum current values in a plurality of clock periods of each path of the clock control signal;
the average current value is taken as the target maximum current value.
4. The method of claim 1, wherein the step of turning off a level shifter for generating each clock control signal when any of the absolute values of the differences is greater than a first predetermined threshold comprises:
when any difference absolute value is larger than a first preset threshold value, obtaining an average value of a plurality of difference absolute values;
and if the average value of the absolute values of the difference values is larger than a first preset threshold value, closing the level converter for generating each path of clock control signal.
5. The method of claim 1, wherein the step of turning off a level shifter for generating each clock control signal when any of the absolute values of the differences is greater than a first predetermined threshold comprises:
when any difference absolute value is larger than a first preset threshold, acquiring a square value of the difference absolute value larger than the first preset threshold;
judging whether the square value is larger than a third preset threshold value or not, and closing a level converter for generating each path of clock control signal; wherein the third preset threshold is smaller than the first preset threshold.
6. The overcurrent protection method according to claim 1, wherein before the step of controlling the clock control signal to turn on the switching devices row by row, the method further comprises:
and amplifying the current value of the clock control signal and keeping the voltage value of the clock control signal unchanged.
7. The method of claim 1, wherein the first predetermined threshold is a predetermined voltage threshold, and the step of turning off a level shifter for generating each clock control signal when any absolute value of the difference is greater than the first predetermined threshold comprises:
acquiring a voltage value corresponding to each difference absolute value;
and if the voltage value is larger than the preset voltage threshold value, closing the level converter generating each path of clock control signal.
8. The overcurrent protection method as recited in any one of claims 1 to 7, wherein the switching device is a thin film transistor.
9. The display panel is characterized by comprising a time schedule controller, a level shifter, a current sensor and a comparator which are electrically connected in sequence, wherein when the display panel runs, the following steps of the overcurrent protection method are executed:
acquiring a target maximum current value of each path of clock control signal generated by a time schedule controller within a preset time length through a current sensor, wherein one path of clock control signal correspondingly controls a row of switching devices to be switched on or switched off;
obtaining a difference absolute value between target maximum current values of the clock control signals of different paths through the comparator;
judging whether any difference absolute value is larger than a first preset threshold value;
when any difference absolute value is larger than a first preset threshold value, a level converter used for generating each path of clock control signal is closed;
and when each difference absolute value is smaller than a first preset threshold value, controlling the clock control signal to open the switching device line by line.
10. An overcurrent protection device, comprising: the overcurrent protection program realizes the following steps when being executed by the processor:
acquiring a target maximum current value of each path of clock control signal within a preset time length, wherein one path of clock control signal correspondingly controls a row of switching devices to be turned on or turned off;
acquiring difference absolute values between target maximum current values of the clock control signals of different paths;
judging whether any difference absolute value is larger than a first preset threshold value;
when any difference absolute value is larger than a first preset threshold value, a level converter used for generating each path of clock control signal is closed;
and when each difference absolute value is smaller than a first preset threshold value, controlling the clock control signal to open the switching device line by line.
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| CN201811595967.3A CN109584829B (en) | 2018-12-25 | 2018-12-25 | Overcurrent protection method, display panel and overcurrent protection device |
| PCT/CN2019/124260 WO2020135021A1 (en) | 2018-12-25 | 2019-12-10 | Overcurrent protection method, display panel, and overcurrent protection apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811595967.3A CN109584829B (en) | 2018-12-25 | 2018-12-25 | Overcurrent protection method, display panel and overcurrent protection device |
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| CN109584829B (en) * | 2018-12-25 | 2020-10-30 | 惠科股份有限公司 | Overcurrent protection method, display panel and overcurrent protection device |
| CN110060644B (en) * | 2019-04-10 | 2021-01-01 | 深圳市华星光电技术有限公司 | Liquid crystal display device and overcurrent protection method thereof |
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| KR101860739B1 (en) * | 2011-05-18 | 2018-05-25 | 삼성디스플레이 주식회사 | Supply voltage converter, display device including the same and method of controlling driving voltage |
| CN103413514A (en) * | 2013-07-27 | 2013-11-27 | 京东方科技集团股份有限公司 | Shifting register unit, shifting register and displaying device |
| CN104700811A (en) * | 2015-03-27 | 2015-06-10 | 友达光电股份有限公司 | Driving control circuit and over-current protection method of GOA circuit thereof |
| CN105304050B (en) * | 2015-11-20 | 2017-07-25 | 深圳市华星光电技术有限公司 | A kind of current foldback circuit and over-current protection method |
| CN105448260B (en) * | 2015-12-29 | 2017-11-03 | 深圳市华星光电技术有限公司 | A kind of current foldback circuit and liquid crystal display |
| US10193326B2 (en) * | 2016-04-21 | 2019-01-29 | Continental Automotive Systems, Inc. | Non-intrusive short-circuit protection for power supply devices |
| CN105761694B (en) * | 2016-05-12 | 2019-02-26 | 深圳市华星光电技术有限公司 | Level translator for array substrate gate driving circuit |
| CN106297702B (en) * | 2016-08-31 | 2018-11-23 | 深圳市华星光电技术有限公司 | Liquid crystal display device and its current foldback circuit |
| CN109243379B (en) * | 2016-11-29 | 2020-10-23 | 海信视像科技股份有限公司 | Liquid crystal display device and short-circuit protection method of multi-partition LED backlight |
| CN107665691B (en) * | 2017-11-13 | 2019-12-24 | 深圳市华星光电技术有限公司 | Overcurrent protection method and overcurrent protection system of liquid crystal display panel |
| CN107742493B (en) * | 2017-11-13 | 2020-03-17 | 深圳市华星光电技术有限公司 | Driving circuit and driving method |
| CN108010497A (en) * | 2017-11-27 | 2018-05-08 | 深圳市华星光电技术有限公司 | A kind of liquid crystal display and its over-current protection method |
| CN108550350B (en) * | 2018-04-18 | 2020-09-01 | 深圳市华星光电技术有限公司 | Overcurrent protection system and overcurrent protection method of liquid crystal display panel |
| CN109584829B (en) * | 2018-12-25 | 2020-10-30 | 惠科股份有限公司 | Overcurrent protection method, display panel and overcurrent protection device |
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