Overcurrent protection method, overcurrent protection device, and computer readable medium

Abstract

The application relates to an overcurrent protection method, an overcurrent protection device and a computer readable medium. The method comprises the following steps: detecting a level conversion moment of each sub-period of a clock signal, the level conversion moment being a rising edge moment or a falling edge moment; obtaining a plurality of target current values of the clock signal at a plurality of current detection moments, the current detection moment being located in a target sub-period, and the time length between the current detection moment and the next level conversion moment of the target sub-period being smaller than the time length between the current detection moment and the previous level conversion moment of the target sub-period; comparing the plurality of target current values with a preset current threshold value respectively, and generating at least one overcurrent control signal; and controlling the power supply state of a display panel according to the at least one overcurrent control signal. The application can avoid the influence of switch switching, improve the accuracy of overcurrent judgment, does not need a high-precision level shifter, has a simple implementation mode, does not need a precise process, and reduces the overall cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display panels, and in particular to an overcurrent protection method, an overcurrent protection device and a computer readable medium. BACKGROUND

[0002] In a gate driver on array (GOA), a level shifter (LS) is usually used to generate a clock (CLK) signal to drive a display panel. However, the panel structure inner frame glue is not tight enough and other process reasons can easily cause the clock signal to be short-circuited, and then overcurrent occurs, which leads to the temperature of the panel rising and even burning out.

[0003] At present, with the increasing resolution and refresh rate of panels, the following schemes are usually used for overcurrent protection (OCP). One of the schemes is to use a boost (BOOST) circuit to generate a VGH voltage to realize overcurrent protection, and the other scheme is to ignore the tip current and then detect the steady-state current for a period of time.

[0004] Figure 1 A schematic diagram showing the overcurrent protection waveform of the related art is shown. As shown in Figure 1 , in the waveform measured by the oscilloscope, CK1 and CK2 represent the clock signal, and the CK2 current is the current corresponding to the clock signal CK2, wherein the AB segment and the CD segment represent the short-circuit current when CK1 and CK2 are short-circuited. For a display panel with high refresh rate, when the refresh rate and resolution are increased, the time of short-circuit maintenance will be shortened synchronously, for example, 1.85us in the figure, and if two periods of time are needed for detection, and considering the general process ±30% accuracy, the detection time of each segment must be less than 0.7us to trigger the overcurrent protection.

[0005] Therefore, the above two schemes cannot solve the problem of clock signal short circuit. This is because the former uses the inductance current peak value as a reference, which has a large error; the latter needs to delay for a period of time to avoid false triggering, ignore the surge caused by switch switching, and then detect for a period of time to confirm that the current continues to exceed the standard, so two consecutive time periods are needed to determine whether the current is over. However, for high refresh rate models, the clock stagger time is getting shorter and shorter, which cannot meet the judgment standard, resulting in overcurrent that cannot be detected. In this case, if the detection time is continuously shortened, only the accuracy can be improved to meet the continuously improving panel requirements, but this not only leads to an increase in chip cost, but also puts higher requirements on the factory process capability, which is not conducive to later production. SUMMARY

[0006] Therefore, the overcurrent protection method, the overcurrent protection device and the computer readable medium are provided, which can avoid the influence of switch switching, improve the accuracy of overcurrent judgment, and do not need a high-precision level shifter. Even if the refresh rate and resolution of the panel are continuously improved, the overcurrent protection mechanism is still effective, and the implementation is simple, does not need a precise process, and reduces the overall cost.

[0007] According to an aspect of the present application, an overcurrent protection method is provided, which is applied to a display panel driven based on at least one periodic clock signal, the clock signal includes a plurality of clock periods, the clock period includes a plurality of sub-periods, and the overcurrent protection method includes: detecting a level transition moment of each sub-period of the clock signal, the level transition moment being a rising edge moment or a falling edge moment; obtaining a plurality of target current values of the clock signal at a plurality of current detection moments, the current detection moment being located in a target sub-period, and the time length between the target sub-period and the next level transition moment of the target sub-period being less than the time length between the target sub-period and the previous level transition moment of the target sub-period; comparing the plurality of target current values with a preset current threshold value respectively to generate at least one overcurrent control signal; and controlling a power supply state of the display panel according to the at least one overcurrent control signal.

[0008] According to another aspect of the present application, an overcurrent protection device is provided, which includes: a processor; and a storage device for storing one or more programs, when the one or more programs are executed by the processor, the processor implements the overcurrent protection method.

[0009] According to another aspect of the present application, a computer readable medium is provided, which stores a computer program, when the computer program is executed by a processor, the overcurrent protection method is implemented.

[0010] By extracting the target current value before the level transition moment to judge whether the current threshold value is exceeded, according to the aspects of the present application, the influence of switch switching can be avoided to improve the accuracy of overcurrent judgment, and a high-precision level shifter is not needed. Even if the refresh rate and resolution of the panel are continuously improved, the overcurrent protection mechanism is still effective, and the implementation is simple, does not need a precise process, and reduces the overall cost. BRIEF DESCRIPTION OF DRAWINGS

[0011] The technical solutions and other beneficial effects of the present application will be apparent through the following detailed description of the specific embodiments of the present application in combination with the accompanying drawings.

[0012] Figure 1 A schematic diagram of an overcurrent protection waveform of a related art is shown.

[0013] Figure 2A flow chart of the overcurrent protection method according to an embodiment of the present application is shown.

[0014] Figure 3 A schematic diagram of the current detection time according to an embodiment of the present application is shown.

[0015] Figure 4 A first flow schematic diagram of the overcurrent protection method according to an embodiment of the present application is shown.

[0016] Figure 5 A second flow schematic diagram of the overcurrent protection method according to an embodiment of the present application is shown.

[0017] Figure 6 A schematic diagram of the overcurrent protection device according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0019] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0020] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected or can communicate with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0021] The following disclosure provides many different embodiments or examples for implementing different structures of the application. In order to simplify the disclosure of the application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the application. In addition, the application can repeatedly refer to numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials. In some examples, methods, means, elements and circuits well known to those skilled in the art are not described in detail, in order to highlight the main idea of the application.

[0022] Figure 2 A flow chart of the overcurrent protection method of the embodiment of the application is shown. The overcurrent protection method can be applied to a display panel, which can be a liquid crystal display (LCD) panel or an organic light-emitting diode (OLED) panel. It can be understood that the application is not limited to the type of display panel.

[0023] Taking a liquid crystal display panel as an example, the display panel includes a plurality of pixel units arranged in an array. Each pixel unit is electrically connected to a data line to receive a data signal through the data line, so that the pixel unit is lit according to a preset gray scale; each row of pixel units is electrically connected to a scan line to receive a scan signal through the scan line, so that the row of pixel units is scanned according to a preset timing.

[0024] In an embodiment, the display panel can be driven based on at least one periodic clock signal, which can be a periodic signal. The clock signal can be denoted as CLKx, x being a positive integer, and a plurality of clock signals can be denoted as CLK1, CLK2, CLK3, and so on. The plurality of different clock signals can have fixed phase differences therebetween and be sent together into a GOA circuit to generate a plurality of scan signals, which can be used to perform line-by-line scanning on respective row pixel units of the display panel.

[0025] In an embodiment, each of the clock signals includes a plurality of clock periods, and each clock period has an equal time length within each of the clock signals. The clock periods of different clock signals can also have equal time lengths.

[0026] In an embodiment, the clock period includes a plurality of sub-periods. Specifically, the clock period includes a first sub-period and a second sub-period adjacent to the first sub-period. Optionally, in the first sub-period, the clock signal is a high-level signal, and in the second sub-period, the clock signal is a low-level signal. In some embodiments, in the first sub-period, the clock signal is a low-level signal, and in the second sub-period, the clock signal is a high-level signal.

[0027] Referring to Figure 2 , the overcurrent protection method includes:

[0028] Step S1: detecting a level transition moment of each sub-period of the clock signal, the level transition moment being a rising edge moment or a falling edge moment;

[0029] In an embodiment, in the process of detecting the level transition moment of the clock signal in the current sub-period, the rising edge moment of the clock signal in the current sub-period can be detected, or the falling edge moment of the clock signal in the current sub-period can be detected. In other words, for the current sub-period, either the rising edge moment or the falling edge moment of the current sub-period can be detected.

[0030] It should be noted that whether the level transition moment is a rising edge moment or a falling edge moment can be related to the state of the current sub-period at the time of detection. For example, if the rising edge moment of the current sub-period is detected first, the rising edge moment can be taken as the level transition moment; if the falling edge moment of the current sub-period is detected, the falling edge moment can also be taken as the level transition moment.

[0031] By detecting the level transition moment of the clock signal in the current sub-period, the time node of detecting the current can be positioned based on the level transition moment, so as to determine when to obtain the current corresponding to the clock signal, and facilitate judging whether overcurrent by using the current obtained at the fixed time node.

[0032] Step S2: obtaining a plurality of target current values of the clock signal at a plurality of current detection moments, the current detection moment being located in a target sub-period, and the time length between the current detection moment and the next level transition moment of the target sub-period being less than the time length between the current detection moment and the previous level transition moment of the target sub-period.

[0033] In an embodiment, the target sub-period is a sub-period in which current detection needs to be performed. There can be multiple target sub-periods. Optionally, each of the sub-periods can be the target sub-period. There is a current detection moment in each of the target sub-periods, so as to detect the real-time current of the clock signal at the current detection moment.

[0034] In an embodiment, the target current value can be the current value of the target current corresponding to the clock signal at the current detection moment. The circuit node corresponding to the target current can be various, for example, can be the drain of a pixel unit, can be a circuit node in a level shifter in which overcurrent can occur when the clock signal is short-circuited, or can be a circuit node in which overcurrent can occur when the clock signal is short-circuited. It can be understood that the target current of the present application can be the current corresponding to the circuit node in which overcurrent is prone to occur in the display panel or the driving circuit part related to the display panel, and the present application does not limit the specific position of the target current.

[0035] In an embodiment, each of the sub-periods can have two level transition moments in front and back, for example, the previous level transition moment corresponding to the rising edge and the next level transition moment corresponding to the falling edge; or, the previous level transition moment corresponding to the falling edge and the next level transition moment corresponding to the rising edge.

[0036] Figure 3 A schematic diagram of the current detection moment of the embodiment of the present application is shown. As shown in Figure 3 The clock signal CLKx is a periodic signal, the first sub-period of the first clock period is t1-t3, the second sub-period of the first clock period is t3-t5, the first sub-period of the second clock period is t5-t7, and the second sub-period of the second clock period is t7-t9. The clock signal CLKx can be a square wave, and the time length L3 of each sub-period is equal. The target current corresponding to the clock signal CLKx is represented by Current of CLKx.

[0037] In one example, the current clock cycle of the clock signal CLKx is the first sub-cycle of the first clock cycle, and the corresponding previous level transition moment is t1 moment of the clock signal CLKx, and the level transition moment is the rising edge moment. Figure 3 The t2 moment, the t4 moment, the t6 moment and the t8 moment of the clock signal CLKx are current detection moments after the t1 moment. The t2 moment is the first current detection moment, located in the first sub-cycle of the first clock cycle and before the falling edge moment t3 of the first sub-cycle of the first clock cycle. Similarly, the t4 moment is located in the second sub-cycle of the first clock cycle and before the rising edge moment t5 of the second sub-cycle of the first clock cycle; the t6 moment is located in the first sub-cycle of the second clock cycle and before the falling edge moment t7 of the first sub-cycle of the second clock cycle; and the t8 moment is located in the second sub-cycle of the second clock cycle and before the rising edge moment t9 of the second sub-cycle of the second clock cycle. Figure 3 It should be noted that the current detection moment is located in a target sub-cycle, and the time length between the current detection moment and the next level transition moment of the target sub-cycle is less than the time length between the current detection moment and the previous level transition moment of the target sub-cycle. Each target sub-cycle can be divided into a first half and a second half, and the current detection moment is located in the second half of the target sub-cycle. That is, the current detection moment of the present application is set adjacent to the next level transition moment of the target sub-cycle in which the current detection moment is located. In this way, the distance between the current detection moment and the corresponding level transition moment can be reduced, and the accuracy of current detection can be improved.

[0038] Further, the obtaining of the multiple target current values of the clock signal at the multiple current detection moments comprises:

[0039]

[0040] Step S21: determining the multiple current detection moments based on the detected first level transition moment and the time length of the sub-cycle;

[0041] In one example, the positions of the multiple current detection moments are associated with the time length of the sub-cycle. Alternatively, the time interval between two adjacent current detection moments is equal to the time length of the sub-cycle.

[0042] Further, the determining of the multiple current detection moments based on the detected first level transition moment and the time length of the sub-cycle comprises:

[0043] Step S211: delaying the first level transition moment by a preset first time length to obtain an initial current detection moment;

[0044] For example, the first time length is equal to the time length of the sub-cycle. Figure 3 ​For example, the first level transition time is time t1. At this time, time t1 can be delayed by a first time length L1 to obtain the initial current detection time, i.e., time t2. At this initial current detection time, the target current value of the clock signal can be detected once.

[0045] Step S212: Based on the initial current detection time, perform current detection once every preset second time length to obtain multiple current detection times.

[0046] The second time length can be the time interval between two adjacent current detection times, and the second time length can be equal to the time length of the sub-cycle.

[0047] Continue with Figure 3 For example, after determining the target current value of the clock signal at time t2, current detection can continue to be performed every second time length L2, using time t2 as a reference, thus obtaining multiple current detection times. At each current detection time, the target current value of the clock signal at that current detection time can be detected once.

[0048] Step S22: Obtain the target current value at each of the multiple current detection times to obtain multiple target current values.

[0049] In one embodiment, multiple target current values ​​can be stored in real time. During storage, the target current values ​​can be stored in the order they were acquired. Optionally, the multiple target current values ​​can be stored in a multidimensional table, which includes the acquired current values ​​and the corresponding current detection times. The stored target current values ​​can be retrieved when needed.

[0050] Step S3: Compare the multiple target current values ​​with preset current thresholds respectively to generate at least one overcurrent control signal;

[0051] In one embodiment, the overcurrent control signal can be a high-level signal or a low-level signal. For example, when the target current value is greater than a preset current threshold, the overcurrent control signal can be a high-level signal; when the current value is less than or equal to the preset current threshold, the overcurrent control signal can be a low-level signal. It is understood that whether a high-level signal or a low-level signal indicates overcurrent can be set as needed, and this application does not limit this.

[0052] Further, the step of comparing the multiple target current values ​​with preset current thresholds to generate at least one overcurrent control signal includes:

[0053] Step S31: configuring a pre-protection state according to the target current value and a preset current threshold, the pre-protection state including an open state and a close state;

[0054] The pre-protection state can be used to represent whether the target current value at the current detection moment is greater than the preset current threshold. When the pre-protection state is the open state, the pre-protection state can be represented by "TRUE" or "1"; when the pre-protection state is the close state, the pre-protection state can be represented by "FALSE" or "0".

[0055] Further, the configuring of the pre-protection state according to the target current value and the preset current threshold includes:

[0056] Step S311: judging whether the target current value is greater than the preset current threshold;

[0057] In an embodiment, the current threshold can be preset. For example, in the embodiment shown in Figure 3 , the current threshold can be OCP High Level. In actual application, it can also be judged whether the target current value is located in a preset current range, for example, the current range can be a range between OCP Low Level and OCP High Level in Figure 3 .

[0058] Step S312: if the target current value is greater than the preset current threshold, configuring the pre-protection state as the open state; if the target current value is less than or equal to the preset current threshold, configuring the pre-protection state as the close state.

[0059] In an embodiment, as shown in Figure 3 , the target current value at t2 moment is less than OCP High Level, so the pre-protection state corresponding to t2 moment is the close state, which can be represented by "0". Similarly, the pre-protection state corresponding to t4 moment and the pre-protection state corresponding to t8 moment are also the close state, which can be represented by "0". The target current value at t6 moment is greater than OCP High Level, so the pre-protection state corresponding to t6 moment is the open state, which can be represented by "1".

[0060] Step S32: delaying for a third time length after the pre-protection state is configured to obtain a conversion judgment moment;

[0061] In an embodiment, the third time length can be set according to needs. Optionally, the third time length is a time length between the current detection moment and a next level conversion moment of a sub-cycle in which the current detection moment is located. For example, in the embodiment shown in Figure 3In some embodiments, the third time length can be a time length between the time t2 and the time t3.

[0062] Step S33: generating at least one overcurrent control signal based on the count value after the conversion judgment time.

[0063] In some embodiments, after determining the conversion judgment time, the count value after the conversion judgment time is continuously calculated, and at least one overcurrent control signal is generated based on the count value.

[0064] Further, the generating at least one overcurrent control signal based on the count value after the conversion judgment time comprises:

[0065] Step S331: judging whether the clock signal corresponding to the conversion judgment time is at a level conversion time.

[0066] In some embodiments, the clock signal corresponding to the conversion time can be at a level duration time or at a level conversion time. Therefore, it is necessary to judge whether the clock signal corresponding to the conversion judgment time is at a level conversion time, and then adjust the count value on this basis to generate at least one overcurrent control signal. For example, the conversion judgment time can be the time t3 in the time t2. Figure 3

[0067] Step S332: if the clock signal corresponding to the conversion judgment time is at a level conversion time, adjusting the count value according to the pre-protection state corresponding to the level conversion time.

[0068] In some embodiments, after confirming that the clock signal corresponding to the conversion judgment time is at a level conversion time, the pre-protection state of the conversion judgment time can be continuously obtained, and then the count value is adjusted according to the pre-protection state of the conversion judgment time.

[0069] Further, the adjusting the count value according to the pre-protection state corresponding to the level conversion time comprises:

[0070] Step S3321: obtaining the pre-protection state of the conversion judgment time.

[0071] Step S3322: if the pre-protection state of the conversion judgment time is an open state, the count value is increased by 1; if the pre-protection state of the conversion judgment time is a closed state, the count value is kept unchanged.

[0072] In some embodiments, the clock signal corresponding to the conversion judgment time is at a level conversion time. Figure 4 ​For example, at t3, the clock signal is at the level transition moment, and at this moment, since the target current value at t2 is less than the current threshold, the pre-protection state at t3 is still the off state. If the initial count value is 0, the count value at t3 is still 0. At t7, the clock signal is at the level transition moment, and at this moment, since the target current value at t6 is greater than the current threshold, the pre-protection state at t7 is the on state. If the initial count value is 0, the count value at t7 becomes 1.

[0073] Further, the generating at least one overcurrent control signal based on the count value after the conversion judgment moment further comprises:

[0074] Step S3320: If the clock signal corresponding to the conversion judgment moment is not at the level transition moment, continue to detect the clock signal.

[0075] Wherein, if the clock signal corresponding to the conversion judgment moment is not at the level transition moment, it means that the level transition moment of the clock signal in the real situation has not been detected, and at this moment, the clock signal needs to be re-detected.

[0076] Step S333: In the case that the clock signal corresponding to the conversion judgment moment is at the level transition moment, generate at least one overcurrent control signal according to the count value and a preset count threshold.

[0077] In an embodiment, the overcurrent control signal is output by a level shifter. The overcurrent control signal can be used to control the power state of the display panel, so as to cut off the power of the display panel in time when a short circuit occurs, reduce the risk of panel burning, and at the same time, maintain the display state of the display panel when no real short circuit occurs, avoiding the false triggering of the overcurrent protection mechanism.

[0078] Further, the generating at least one overcurrent control signal according to the count value and a preset count threshold comprises:

[0079] Step S3331: Determine whether the count value is greater than the preset count threshold.

[0080] In an embodiment, the count threshold can be set according to the type of the display panel. Optionally, the count threshold is 0 or 1.

[0081] Step S3332: If the count value is greater than the preset count threshold, control the overcurrent control signal to be a low-level signal to cut off the power of the display panel; if the count value is less than the preset count threshold, control the overcurrent control signal to be a high-level signal to turn on the power of the display panel.

[0082] Figure 4A first flowchart of the overcurrent protection method of the embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, PRE OCP represents an internal variable recording the previous state of the internal OCP state. In the initial state, the internal variable is in the off state. When the current of the clock signal output by the GOA circuit is greater than the current threshold, the internal variable becomes the on state; when the current of the clock signal output by the GOA circuit is less than or equal to the current threshold, the internal variable remains in the off state. The third time length N nanoseconds is delayed on this basis. Figure 5

[0083] Step S4: controlling the power state of the display panel according to at least one overcurrent control signal.

[0084] For example, when the overcurrent control signal is at a high level, the power state of the display panel is controlled to be off; when the overcurrent control signal is at a low level, the power state of the display panel is controlled to be on. Since the overcurrent control signal at a high level can be caused by various short circuit factors, the overall power of the display panel can be controlled to be in the off state to reduce the risk of burning the entire display panel.

[0085] Figure 5 A second flowchart of the overcurrent protection method of the embodiment of the present application is shown in FIG. 2. As shown in FIG. 2, OCP_Counter represents the count value of the internal OCP, LS_OCP represents the OCP enable state of the level shifter, and OCP_TimesTh represents the threshold for counting the number of times of OCP occurrence. In the initial state, the count value is 0. After detecting the rising edge or falling edge of the clock signal, it is necessary to determine whether the internal variable state at this time is on. If the internal variable state at this time is on, the count value is incremented by 1; if the internal variable state at this time is off, the count value remains unchanged. Then it is continuously determined whether the count value exceeds the preset count threshold. Once the count value exceeds the preset count threshold, the OCP enable state of the level shifter is set to true, and a low-level signal is output to cut off the power supply of the display panel; otherwise, the power supply of the display panel is turned on. Figure 6

[0086] It is worth noting that the embodiment of the present application extracts the target current value before the level conversion moment. The target current value is accessed every interval of time, but only when the clock signal is at the level conversion moment is it determined whether the current exceeds the preset current threshold, and further based on the number of repeated occurrences, it is determined whether the level shifter enters the overcurrent protection state. In this way, the influence of switch switching is avoided to improve the accuracy of overcurrent judgment, and a high-precision level shifter is not required. Even if the panel refresh rate and resolution continue to improve, the overcurrent protection mechanism is still effective.

[0087] ​​Further, the application also provides an overcurrent protection device, comprising: a processor; and a storage device for storing one or more programs, which, when executed by the processor, cause the processor to implement the overcurrent protection method.

[0088] The application also provides a computer readable medium, which stores a computer program, which, when executed by a processor, implements the overcurrent protection method.

[0089] Figure 6 A schematic diagram of an overcurrent protection device according to an embodiment of the application is shown.

[0090] In an embodiment, as shown in ​ the display panel can be electrically connected with a pixel driving circuit, the pixel driving circuit can include a gate driving circuit and a source driving circuit, the gate driving circuit can be electrically connected to the gate of the thin film transistor of each pixel unit to provide a scanning signal to the pixel units of a corresponding row; and the source driving circuit can be electrically connected to the drain of the thin film transistor of each pixel unit to provide a data signal to the corresponding pixel units.

[0091] In an embodiment, the processor can be arranged in a level shifter. The timing controller can be electrically connected with the level shifter and the source driver, respectively. The level shifter can be electrically connected with a power supply circuit to control the power supply of the display panel to be turned off by delivering an overcurrent control signal to the power supply circuit when overcurrent occurs. For specific details of the overcurrent protection device, reference can be made to the overcurrent protection method, which will not be described herein.

[0092] In summary, the application can improve the accuracy of overcurrent determination by extracting the target current value before the level conversion moment to determine whether the current threshold is exceeded, avoid the influence of switch switching, and does not require a high-precision level shifter. Even if the panel refresh rate and resolution continue to improve, the overcurrent protection mechanism is still effective, and the implementation is simple and does not require precise processes, thereby reducing the overall cost.

[0093] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0094] The overcurrent protection method, the overcurrent protection device and the computer readable medium provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above embodiment description is only used to help understand the technical solutions of the present application and the core ideas thereof; those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features thereof can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An overcurrent protection method, characterized by, The overcurrent protection method is applied to a display panel, the display panel is driven based on a periodic at least one clock signal, the clock signal comprises a plurality of clock periods, the clock period comprises a plurality of sub-periods, and the overcurrent protection method comprises: detecting a level transition moment of each sub-period of the clock signal, the level transition moment being a rising edge moment or a falling edge moment; obtaining a plurality of target current values of the clock signal at a plurality of current detection moments, the current detection moment being located in a target sub-period and having a time length smaller than that between the target sub-period and a next level transition moment of the target sub-period; comparing the plurality of target current values with a preset current threshold value respectively to generate at least one overcurrent control signal; controlling a power supply state of the display panel according to the at least one overcurrent control signal; wherein the comparing the plurality of target current values with a preset current threshold value respectively to generate at least one overcurrent control signal comprises: configuring a pre-protection state according to the target current value and the preset current threshold value, the pre-protection state comprising an open state and a closed state; delaying for a third time length after the pre-protection state configuration is completed to obtain a transition judgment moment; and generating at least one overcurrent control signal based on a counting value after the transition judgment moment. wherein the generating at least one overcurrent control signal based on the counting value after the transition judgment moment comprises: judging whether the clock signal corresponding to the transition judgment moment is at a level transition moment; if the clock signal corresponding to the transition judgment moment is at a level transition moment, adjusting the counting value according to the pre-protection state corresponding to the level transition moment; if the clock signal corresponding to the transition judgment moment is not at a level transition moment, continuing to detect the clock signal; and in the case that the clock signal corresponding to the transition judgment moment is at a level transition moment, generating at least one overcurrent control signal according to the counting value and a preset counting threshold value.

2. The overcurrent protection method of claim 1, wherein, The obtaining a plurality of target current values of the clock signal at a plurality of current detection moments comprises: determining a plurality of current detection moments based on a detected first level transition moment and a time length of the sub-period; obtaining target current values of the plurality of current detection moments one by one to obtain a plurality of target current values.

3. The overcurrent protection method of claim 2, wherein, The determining a plurality of current detection moments based on a detected first level transition moment and a time length of the sub-period comprises: delaying the first level transition moment by a preset first time length to obtain an initial current detection moment; taking the initial current detection moment as a reference, performing current detection every preset second time length to obtain a plurality of current detection moments.

4. The overcurrent protection method of claim 1, wherein, The configuring a pre-protection state according to the target current value and the preset current threshold value comprises: judging whether the target current value is greater than the preset current threshold value; if the target current value is greater than the preset current threshold value, configuring the pre-protection state as an open state; and if the target current value is less than or equal to the preset current threshold value, configuring the pre-protection state as a closed state.

5. The overcurrent protection method of claim 1, wherein, The count value is adjusted according to the pre-protection state corresponding to the level conversion moment, and the adjustment includes: acquiring the pre-protection state of the conversion judgment moment; if the pre-protection state of the conversion judgment moment is the open state, the count value is added by 1; if the pre-protection state of the conversion judgment moment is the closed state, the count value is kept unchanged.

6. The overcurrent protection method of claim 1, wherein, The over-current control signal is output by a level shifter, and the generation of at least one over-current control signal according to the count value and a preset count threshold value includes: judging whether the count value is greater than the preset count threshold value; if the count value is greater than the preset count threshold value, the over-current control signal is controlled to be a low-level signal to cut off the power supply of the display panel; if the count value is less than the preset count threshold value, the over-current control signal is controlled to be a high-level signal to open the power supply of the display panel.

7. An overcurrent protection device, characterized by The over-current protection device includes a processor and a storage device for storing one or more programs, when the one or more programs are executed by the processor, the processor implements the over-current protection method as claimed in any one of claims 1-6.

8. A computer readable medium characterized by A computer program is stored thereon, and the computer program is executed by a processor to implement the over-current protection method as claimed in any one of claims 1-6.

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