Overcurrent protection circuit and display panel

Abstract

The present application belongs to the field of display, and specifically relates to an overcurrent protection circuit and a display panel. The overcurrent protection circuit includes a current comparison module, a discharge control module and a variable resistance module. The current comparison module is connected to a reference power supply and a target circuit; the discharge control module includes a first transistor, the control end of the first transistor is connected to the output end of the current comparison module, the first end and the second end of the first transistor are respectively connected to the target circuit and the variable resistance module, and the variable resistance module includes at least a relatively high resistance state and a low resistance state. The overcurrent protection circuit is used to protect the GOA signal line of the display panel. When the current of the target circuit is greater than the current output by the reference power supply, the variable resistance module is in a low resistance state, and the large current of the GOA signal line is released to the ground terminal through the variable resistance module, which can avoid the GOA signal line current being too large, causing an impact on the circuit of the display panel, and causing damage to the circuit and circuit components.

Description

Technical Field

[0001] The present application belongs to the field of display, and specifically relates to an overcurrent protection circuit and a display panel. Background Art

[0002] Display panels include liquid crystal display panels (LCD) and organic light-emitting diode (OLED) display panels, etc. The display panel includes multiple rows of scan lines, multiple columns of data lines and multiple pixel units. The pixel units correspond to the intersections of the scan lines and the data lines one by one and are connected to the scan lines of the corresponding rows and the data lines of the corresponding columns.

[0003] The display panel also includes a gate drive circuit for driving the pixel array, and the gate drive circuit includes a gate driver on array (GOA) circuit. When the gate drive circuit provides a scan signal on the corresponding scan line, all transistors connected to the scan line are switched to an on state, so that each pixel unit on the scan line receives a display signal from the data line connected to it, thereby realizing a pixel array display screen.

[0004] When the display panel is in normal working condition, the current value of the gate drive circuit is small. However, when the display panel is in abnormal working state, disturbed by the external environment (static electricity, etc.) or the gate drive circuit is short-circuited, the gate drive circuit will generate a large current. The large current will impact the circuit of the display panel, causing abnormal voltage output and damage to the circuit and circuit components, which will lead to various faults such as horizontal stripes, crosstalk, flickering screen, black screen, etc. on the display panel, reducing the display quality. Summary of the invention

[0005] The purpose of the present application is to provide an overcurrent protection circuit and a display panel to prevent the display panel circuits and circuit components from being damaged by large current shocks, thereby improving the reliability and life of the display panel.

[0006] In order to achieve the above object, the present application provides an overcurrent protection circuit, comprising:

[0007] A current comparison module, wherein a first input terminal of the current comparison module is connected to a reference power supply, and a second input terminal of the current comparison module is connected to a target circuit;

[0008] A discharge control module, comprising a first transistor, a control end of the first transistor is connected to the output end of the current comparison module, and a first end of the first transistor is connected to the target line;

[0009] A variable resistance module, wherein the second end of the first transistor is connected to the ground terminal through the variable resistance module, and the variable resistance module at least includes a relatively high resistance state and a low resistance state. When the current of the target circuit is greater than the current of the reference power supply, the variable resistance module is in the low resistance state, and when the current of the target circuit is less than the current of the reference power supply, the variable resistance module is in the high resistance state.

[0010] Optionally, the variable resistance module includes a memristor, the negative electrode of the memristor is connected to the second end of the first transistor, the discharge control module also includes a second transistor, the control end of the second transistor is connected to the output end of the current comparison module, the first end of the second transistor is connected to the positive electrode of the memristor, and the second end of the second transistor is connected to the ground end;

[0011] When the current of the target circuit is greater than the current of the reference power supply, the current flows from the target circuit, through the first transistor, the negative electrode of the memristor, the positive and negative electrodes of the memristor, and the second transistor to the ground terminal. The overcurrent protection circuit also includes a reset module. When the current of the target circuit is less than the current of the reference power supply, the reset module causes the current to flow from the positive electrode of the memristor to the negative electrode of the memristor.

[0012] Optionally, the positive electrode of the memristor is directly or indirectly connected to a reset power supply, the reset module includes a third transistor, the control end of the third transistor is connected to a reset signal line, the first end of the third transistor is connected to the negative electrode of the memristor, and the second end of the third transistor is directly or indirectly connected to the ground end.

[0013] Optionally, the reset module further includes a fourth transistor, a control end of the fourth transistor is connected to the reset signal line, a first end of the fourth transistor is connected to the reset power supply, and a second end of the fourth transistor is connected to the positive electrode of the memristor.

[0014] Optionally, the reset module further includes a current limiting resistor, wherein the current limiting resistor is connected to the second end of the third transistor and the ground end.

[0015] Optionally, when the current of the target circuit is greater than the current of the reference power supply, the current comparison module outputs a high level signal;

[0016] The first transistor and the second transistor are both N-channel transistors, the third transistor and the fourth transistor are both P-channel transistors, and the reset signal line is connected to the output end of the current comparison module.

[0017] Optionally, when the current of the target circuit is greater than the current of the reference power supply, the current comparison module outputs a high level signal;

[0018] The first transistor, the second transistor, the third transistor and the fourth transistor are all N-channel transistors.

[0019] Optionally, when the current of the target circuit is greater than the current of the reference power supply, the current comparison module outputs a high level signal;

[0020] The current comparison module includes a current comparator, a first input terminal of the current comparator is connected to the reference power supply, and a second input terminal of the current comparator is connected to the target line.

[0021] Optionally, the reference power supply is a constant current source, and the first input terminal of the current comparator is connected to the constant current source; or

[0022] The reference power supply is a voltage source, the overcurrent protection circuit further includes a current sampling resistor, and the first input terminal of the current comparator is connected to the reference power supply through the current sampling resistor.

[0023] The present application also provides a display panel, comprising:

[0024] The overcurrent protection circuit;

[0025] The GOA signal line is connected to the overcurrent protection circuit.

[0026] The overcurrent protection circuit and display panel disclosed in the present application have the following beneficial effects:

[0027] In the present application, the overcurrent protection circuit includes a current comparison module, a discharge control module and a variable resistance module, the first input end of the current comparison module is connected to the reference power supply, the second input end of the current comparison module is connected to the target circuit, the discharge control module includes a first transistor, the control end of the first transistor is connected to the output end of the current comparison module, the first end of the first transistor is connected to the target circuit, the second end of the first transistor is connected to the ground terminal through the variable resistance module, and the variable resistance module includes at least a relatively high resistance state and a low resistance state. The overcurrent protection circuit is used to protect the GOA signal line of the display panel. When the current of the target circuit is greater than the current output by the reference power supply, the variable resistance module is in a low resistance state, and the large current of the GOA signal line is released to the ground terminal through the variable resistance module, which can avoid the GOA signal line current being too large, causing an impact on the line of the display panel, and causing damage to the line and circuit components.

[0028] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a structural schematic diagram of the overcurrent protection circuit in Example 1 of the present application.

[0032] Figure 2 It is a schematic diagram of the structure of the display panel in the second embodiment of the present application.

[0033] Description of reference numerals:

[0034] 100. Overcurrent protection circuit;

[0035] 110, current comparison module; 120, discharge control module; 121, first transistor; 122, second transistor; 130, variable resistance module; 131, memristor; 140, reset module; 141, third transistor; 142, fourth transistor; 143, current limiting resistor; 150, current sampling resistor; 161, reference power supply; 162, reset power supply; 163, ground terminal;

[0036] 200. target circuit; 300. gate drive circuit. DETAILED DESCRIPTION

[0037] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0038] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0039] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0040] Embodiment 1

[0041] See also Figure 1 As shown, the overcurrent protection circuit 100 in this embodiment includes a current comparison module 110, a discharge control module 120 and a variable resistance module 130. The first input terminal of the current comparison module 110 is connected to the reference power supply 161, and the second input terminal of the current comparison module 110 is connected to the target line 200. The discharge control module 120 includes a first transistor 121, the control terminal of the first transistor 121 is connected to the output terminal of the current comparison module 110, the first terminal of the first transistor 121 is connected to the target line 200, and the second terminal of the first transistor 121 is connected to the ground terminal 163 through the variable resistance module 130.

[0042] The resistance value of the variable resistance module 130 can be switched. The variable resistance module 130 includes at least a relatively high resistance state and a low resistance state. When the current of the target circuit 200 is greater than the current output by the reference power supply 161, the variable resistance module 130 is in the low resistance state. When the current of the target circuit 200 is less than the current output by the reference power supply 161, the variable resistance module 130 is in the high resistance state.

[0043] The overcurrent protection circuit 100 can be used to protect the GOA signal line to prevent the GOA signal line from being too current, which may impact the line of the display panel and cause damage to the line and circuit components. The GOA signal line includes a clock signal line (CK), a low-frequency clock signal line (LC), a frame start signal line (STV), a reset signal line (Reset), a high-level signal line (VGH) and a low-level signal line (VGL). Among them, the clock signal line, the low-frequency clock signal line, the frame start signal line and the reset signal line are connected to the level shift chip (Level shift IC), and the high-level signal line (VGH) and the low-level signal line (VGL) are connected to the power management chip (Power Management Integrated Circuits).

[0044] The overcurrent protection circuit 100 is used to protect the GOA signal line, that is, the target line 200 is the GOA signal line. When the current of the target line 200 is greater than the current output by the reference power supply 161, the output terminal of the current comparison module 110 outputs a control signal to control the first transistor 121 to turn on and switch the variable resistance module 130 to a low resistance state. The large current of the target line 200 is released to the ground terminal 163 through the first transistor 121 and the variable resistance module 130, thereby preventing the GOA signal line from being too large and impacting the line of the display panel, causing damage to the line and circuit components.

[0045] When the current of the target line 200 is less than the current output by the reference power supply 161, the output terminal of the current comparison module 110 outputs a control signal to control the first transistor 121 to be turned off and the variable resistance module 130 to be switched to a high resistance state. If the variable resistance module 130 is always in a low resistance state, even if the first transistor 121 is in a turned-off state, leakage is inevitable, and the current of the GOA signal line will be released to the ground terminal 163 through the first transistor 121 and the variable resistance module 130, thereby affecting the GOA signal. The output terminal of the current comparison module 110 outputs a control signal to switch the variable resistance module 130 to a high resistance state, which is similar to a circuit breaker, and can effectively prevent the current of the GOA signal line from being released to the ground terminal 163 through the variable resistance module 130.

[0046] When the display panel is in an abnormal working state, is disturbed by the external environment, or the gate drive circuit is short-circuited, the gate drive circuit will generate a large current. The large current will impact the circuit of the display panel, causing abnormal voltage output and damage to the circuit and circuit components, which will lead to various faults such as horizontal stripes, crosstalk, flickering screen, black screen, etc. on the display panel, reducing the display quality.

[0047] In this embodiment, the overcurrent protection circuit 100 includes a current comparison module 110, a discharge control module 120 and a variable resistance module 130. The first input end of the current comparison module 110 is connected to the reference power supply 161, and the second input end of the current comparison module 110 is connected to the target line 200. The discharge control module 120 includes a first transistor 121. The control end of the first transistor 121 is connected to the output end of the current comparison module 110, the first end of the first transistor 121 is connected to the target line 200, and the second end of the first transistor 121 is connected to the ground end 163 through the variable resistance module 130. The variable resistance module 130 at least includes a relatively high resistance state and a low resistance state. The overcurrent protection circuit 100 is used to protect the GOA signal line of the display panel. When the current of the target circuit 200 is greater than the current output by the reference power supply 161, the variable resistor module 130 is in a low resistance state, and the large current of the GOA signal line is released to the ground terminal 163 through the variable resistor module 130, which can prevent the GOA signal line from being too large and causing an impact on the line of the display panel, resulting in damage to the line and circuit components.

[0048] In addition, the variable resistance module 130 is in a high resistance state, which is similar to an open circuit, and can prevent the current of the GOA signal line from being at a normal level. However, due to transistor leakage, the current of the GOA signal line is released to the ground terminal 163 through the variable resistance module 130, thereby affecting the GOA signal.

[0049] For example, the variable resistance module 130 includes a memristor 131, and the resistance value of the memristor 131 is switchable. When the current flows from the positive electrode to the negative electrode of the memristor 131, the resistance value of the memristor 131 gradually increases, that is, the memristor 131 switches from a low resistance state to a high resistance state; when the current flows from the negative electrode to the positive electrode of the memristor 131, the resistance value of the memristor 131 gradually decreases, that is, the memristor 131 switches from a high resistance state to a low resistance state. The low resistance state and the high resistance state can be the minimum value and the maximum value within the variable resistance range of the memristor 131.

[0050] The negative electrode of the memristor 131 is connected to the second end of the first transistor 121, the discharge control module 120 further includes a second transistor 122, the control end of the second transistor 122 is connected to the output end of the current comparison module 110, the first end of the second transistor 122 is connected to the positive electrode of the memristor 131, and the second end of the second transistor 122 is connected to the ground end 163. The second transistor 122 and the first transistor 121 are both P-channel transistors or the second transistor 122 and the first transistor 121 are both N-channel transistors.

[0051] When the current of the target line 200 is greater than the current output by the reference power supply 161, the first transistor 121 and the second transistor 122 are turned on at the same time, and the current of the target line 200 flows through the first transistor 121, the negative electrode of the memristor 131, the positive and negative electrodes of the memristor 131, and the second transistor 122 to the ground terminal 163, and the memristor 131 switches from a high resistance state to a low resistance state. The overcurrent protection circuit 100 also includes a reset module 140. When the current of the target line 200 is less than the current output by the reference power supply 161, the first transistor 121 and the second transistor 122 are turned off at the same time, and the reset module 140 causes the current to flow from the positive electrode of the memristor 131 to the negative electrode of the memristor 131, and the memristor 131 switches from a low resistance state to a high resistance state.

[0052] The variable resistance module 130 includes a memristor 131 , and the resistance value of the memristor 131 is switchable, so that switching between a low resistance state and a high resistance state is easier.

[0053] It should be noted that the variable resistance module 130 may include a memristor 131, but is not limited thereto. The variable resistance module 130 may also include multiple resistors or varistors, depending on the specific situation. The variable resistance module 130 includes multiple resistors, and the multiple resistors include a small resistor and a large resistor connected in series. When the current of the target line 200 is greater than the current output by the reference power supply 161, the large resistor can be short-circuited to achieve the variable resistance module 130 switching from a high resistance state to a low resistance state; when the current of the target line 200 is less than the current output by the reference power supply 161, the small resistor and the large resistor can be connected in series to achieve the variable resistance module 130 switching from a low resistance state to a high resistance state. The variable resistance module 130 includes a varistor, and the resistance value of the varistor changes with the voltage. The voltage of the varistor can be adjusted to achieve switching between a low resistance state and a high resistance state.

[0054] In some embodiments, the positive electrode of the memristor 131 is directly or indirectly connected to the reset power supply 162, the reset module 140 includes a third transistor 141, the control end of the third transistor 141 is connected to the reset signal line, the first end of the third transistor 141 is connected to the negative electrode of the memristor 131, and the second end of the third transistor 141 is directly or indirectly connected to the ground end 163.

[0055] When the current of the target circuit 200 is greater than the current output by the reference power supply 161, the first transistor 121 and the second transistor 122 are turned on at the same time, and the reset signal line signal controls the third transistor 141 to be turned off. The current of the target circuit 200 flows through the first transistor 121, the negative electrode of the memristor 131, the positive and negative electrodes of the memristor 131, and the second transistor 122 to the ground terminal 163. The memristor 131 switches from a high resistance state to a low resistance state. At the same time, the reset power supply 162 is connected to the ground terminal 163, and the current flows from the reset power supply 162 to the ground terminal 163 through the second transistor 122. When the current of the target circuit 200 is less than the current output by the reference power supply 161, the first transistor 121 and the second transistor 122 are turned off at the same time, and the reset signal line signal controls the third transistor 141 to turn on. The current flows from the reset power supply 162 through the positive and negative electrodes of the memristor 131, the negative electrode of the memristor 131, and the third transistor 141 to the ground terminal 163, and the memristor 131 switches from a low resistance state to a high resistance state. The variable resistor module 130 is in a high resistance state, which is similar to a circuit breaker, and can reduce the energy consumption of the reset power supply 162.

[0056] In some embodiments, the reset module 140 further includes a fourth transistor 142 , a control end of the fourth transistor 142 is connected to the reset signal line, a first end of the fourth transistor 142 is connected to the reset power supply 162 , and a second end of the fourth transistor 142 is connected to the positive electrode of the memristor 131 .

[0057] When the current of the target circuit 200 is greater than the current output by the reference power supply 161, the reset signal line signal controls the fourth transistor 142 to turn off, preventing the reset power supply 162 from being connected to the ground terminal 163, thereby reducing the energy consumption of the reset power supply 162; when the current of the target circuit 200 is less than the current output by the reference power supply 161, the reset signal line signal controls the third transistor 141 and the fourth transistor 142 to turn on, and the current flows from the reset power supply 162 through the fourth transistor 142, the positive and negative electrodes of the memristor 131, the negative electrode of the memristor 131, and the third transistor 141 to the ground terminal 163, and the memristor 131 switches from a low resistance state to a high resistance state.

[0058] In some embodiments, when the current of the target line 200 is greater than the current output by the reference power supply 161, the current comparison module 110 outputs a high level signal; when the current of the target line 200 is less than the current output by the reference power supply 161, the current comparison module 110 outputs a low level signal. The first transistor 121 and the second transistor 122 may both be N-channel transistors, the third transistor 141 and the fourth transistor 142 may both be P-channel transistors, and the reset signal line is connected to the output end of the current comparison module 110.

[0059] Since one of the transistors of the discharge control module 120 and the reset module 140 is turned on and the other is turned off, both the transistors of the discharge control module 120 and the reset module 140 are connected to the output end of the current comparison module 110 , which can reduce one control signal to control the reset module 140 .

[0060] It should be noted that the third transistor 141 and the fourth transistor 142 may both be P-channel transistors, but are not limited thereto. The third transistor 141 and the fourth transistor 142 may both be N-channel transistors, depending on the specific situation. The third transistor 141 and the fourth transistor 142 are both N-channel transistors, and the reset signal line is not connected to the output end of the current comparison module 110, but is controlled by a separate controller, depending on the specific situation.

[0061] The first transistor 121 , the second transistor 122 , the third transistor 141 and the fourth transistor 142 are all N-channel transistors, which can reduce the manufacturing cost of the overcurrent protection circuit 100 and the display panel.

[0062] In some embodiments, the reset module 140 further includes a current limiting resistor 143 , and the current limiting resistor 143 is connected to the second end of the third transistor 141 and the ground end 163 .

[0063] When the current of the target circuit 200 is less than the current output by the reference power supply 161, the third transistor 141 and the fourth transistor 142 are turned on, and the current flows from the reset power supply 162 through the fourth transistor 142, the positive and negative electrodes of the memristor 131, the negative electrode of the memristor 131, the third transistor 141, and the current limiting resistor 143 to the ground terminal 163. The current limiting resistor 143 can limit the current size to avoid circuit damage caused by excessive current.

[0064] In some embodiments, the current comparison module 110 includes a current comparator, a first input terminal of the current comparator is connected to the reference power supply 161, and a second input terminal of the current comparator is connected to the target circuit 200. When the current of the target circuit 200 is greater than the current output by the reference power supply 161, the current comparator outputs a high level signal; when the current of the target circuit 200 is less than the current output by the reference power supply 161, the current comparator outputs a low level signal.

[0065] It should be noted that the current comparison module 110 can be a current comparator, but is not limited thereto. The current comparison module 110 can also be a voltage comparator, depending on the specific situation. When the current comparison module 110 is a voltage comparator, the current of the target circuit 200 can be converted into a voltage by a voltage sampling resistor before comparison.

[0066] The current comparison module 110 is a current comparator. The current comparison module 110 directly compares the current of the target circuit 200 with the current output by the reference power supply 161 and outputs a high level signal or a low level signal. The circuit structure is simpler.

[0067] In some embodiments, the reference power source 161 is a voltage source, the overcurrent protection circuit 100 further includes a current sampling resistor 150 , and the first input terminal of the current comparator is connected to the reference power source 161 through the current sampling resistor 150 .

[0068] When the overcurrent protection circuit 100 is used for a display panel, the display panel has power sources such as a high-level signal line and a low-level signal line. The reference power supply 161 and the reset power supply 162 can use the existing power supply of the display panel, thereby simplifying the structure of the overcurrent protection circuit 100.

[0069] It should be noted that some display panels also have a constant current source, and the reference power supply 161 can also be a constant current source. When the overcurrent protection circuit 100 is used for a display panel, the reference power supply 161 can use the existing constant current source of the display panel, thereby simplifying the structure of the overcurrent protection circuit 100.

[0070] Embodiment 2

[0071] See also Figure 2 As shown, in this embodiment, the display panel includes a display area. The display panel also includes a gate drive circuit 300, and the gate drive circuit 300 is arranged on at least one side of the display area. The gate drive circuit 300 includes a GOA circuit and an overcurrent protection circuit 100, and the gate drive circuit 300 and the overcurrent protection circuit 100 are connected through a target line 200, and the target line 200 includes a GOA signal line.

[0072] The GOA signal line includes a clock signal line, a low-frequency clock signal line, a frame start signal line, a reset signal line, a high-level signal line, and a low-level signal line. Among them, the clock signal line, the low-frequency clock signal line, the frame start signal line, and the reset signal line are connected to the level conversion chip, and the high-level signal line and the low-level signal line are connected to the power management chip. The level conversion chip or the power management chip can be set on the display panel or on the mainboard. In addition, the overcurrent protection circuit 100 can also be set on the mainboard.

[0073] It should be noted that the target circuit 200 may include a GOA signal line, that is, the overcurrent protection circuit 100 is used to protect the GOA signal line, but is not limited to this. The overcurrent protection circuit 100 can also be used to protect other power supply lines or signal lines of the display panel, depending on the specific situation.

[0074] In this embodiment, the display panel includes an overcurrent protection circuit 100, which includes a current comparison module 110, a discharge control module 120 and a variable resistance module 130. The first input end of the current comparison module 110 is connected to the reference power supply 161, and the second input end of the current comparison module 110 is connected to the target circuit 200. The target circuit 200 includes a GOA signal line. The discharge control module 120 includes a first transistor 121. The control end of the first transistor 121 is connected to the output end of the current comparison module 110, the first end of the first transistor 121 is connected to the target circuit 200, and the second end of the first transistor 121 is connected to the ground end 163 through the variable resistance module 130. The variable resistance module 130 at least includes a relatively high resistance state and a low resistance state. The overcurrent protection circuit 100 is used to protect the GOA signal line of the display panel. When the current of the target line 200 is greater than the current output by the reference power supply 161, the variable resistor module 130 is in a low resistance state, and the large current of the GOA signal line is released to the ground terminal 163 through the variable resistor module 130, which can prevent the GOA signal line from being too large and impacting the line of the display panel, causing damage to the line and circuit components. The variable resistor module 130 is in a high resistance state, which is similar to an open circuit, and can prevent the GOA signal line current from being at a normal level. However, due to transistor leakage, the current of the GOA signal line is released to the ground terminal 163 through the variable resistor module 130, thereby affecting the GOA signal.

[0075] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0076] In this application, unless otherwise clearly specified and limited, the terms "assembly", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0077] In the description of this specification, the description with reference to the terms "some embodiments", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0078] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent of this application.

Claims

1. An overcurrent protection circuit, characterized in that: include: A current comparison module, wherein a first input terminal of the current comparison module is connected to a reference power supply, and a second input terminal of the current comparison module is connected to a target circuit; A discharge control module, comprising a first transistor, a control end of the first transistor is connected to the output end of the current comparison module, and a first end of the first transistor is connected to the target line; A variable resistance module, wherein the second end of the first transistor is connected to the ground terminal through the variable resistance module, the variable resistance module at least includes a relatively high resistance state and a low resistance state, when the current of the target line is greater than the current of the reference power supply, the variable resistance module is in a low resistance state, and when the current of the target line is less than the current of the reference power supply, the variable resistance module is in a high resistance state, the variable resistance module includes a memristor, the negative electrode of the memristor is connected to the second end of the first transistor, the positive electrode of the memristor is directly or indirectly connected to the ground terminal, and the overcurrent protection circuit further includes a reset module, the reset module is connected to the positive and negative electrodes of the memristor; When the current of the target circuit is greater than the current of the reference power supply, the current flows from the target circuit, through the first transistor, the negative electrode of the memristor, and the positive electrode of the memristor to the ground terminal; when the current of the target circuit is less than the current of the reference power supply, the reset module causes the current to flow from the positive electrode of the memristor to the negative electrode of the memristor.

2. The overcurrent protection circuit according to claim 1, characterized in that: The discharge control module further includes a second transistor, a control end of the second transistor is connected to the output end of the current comparison module, a first end of the second transistor is connected to the positive electrode of the memristor, and a second end of the second transistor is connected to the ground end; When the current of the target line is greater than the current of the reference power supply, the current flows from the target line, through the first transistor, the negative electrode of the memristor, the positive electrode of the memristor, and the second transistor to the ground terminal.

3. The overcurrent protection circuit according to claim 2, characterized in that: The positive electrode of the memristor is directly or indirectly connected to the reset power supply, the reset module includes a third transistor, the control end of the third transistor is connected to the reset signal line, the first end of the third transistor is connected to the negative electrode of the memristor, and the second end of the third transistor is directly or indirectly connected to the ground end.

4. The overcurrent protection circuit according to claim 3, characterized in that: The reset module further includes a fourth transistor, a control end of the fourth transistor is connected to the reset signal line, a first end of the fourth transistor is connected to the reset power supply, and a second end of the fourth transistor is connected to the positive electrode of the memristor.

5. The overcurrent protection circuit according to claim 4, characterized in that: The reset module further includes a current limiting resistor, and the current limiting resistor is connected to the second end of the third transistor and the ground end.

6. The overcurrent protection circuit according to claim 4, characterized in that: When the current of the target circuit is greater than the current of the reference power supply, the current comparison module outputs a high level signal; The first transistor and the second transistor are both N-channel transistors, the third transistor and the fourth transistor are both P-channel transistors, and the reset signal line is connected to the output end of the current comparison module.

7. The overcurrent protection circuit according to claim 4, characterized in that: When the current of the target circuit is greater than the current of the reference power supply, the current comparison module outputs a high level signal; The first transistor, the second transistor, the third transistor and the fourth transistor are all N-channel transistors.

8. The overcurrent protection circuit according to claim 4, characterized in that: When the current of the target circuit is greater than the current of the reference power supply, the current comparison module outputs a high level signal; The current comparison module includes a current comparator, a first input terminal of the current comparator is connected to the reference power supply, and a second input terminal of the current comparator is connected to the target line.

9. The overcurrent protection circuit according to claim 8, characterized in that: The reference power source is a constant current source, and the first input terminal of the current comparator is connected to the constant current source; or The reference power supply is a voltage source, the overcurrent protection circuit further includes a current sampling resistor, and the first input terminal of the current comparator is connected to the reference power supply through the current sampling resistor.

10. A display panel, characterized in that: include: The overcurrent protection circuit according to any one of claims 1 to 9; The GOA signal line is connected to the overcurrent protection circuit.

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