Line detection device and display

Abstract

The application relates to a line detection device and a display. The line detection device comprises a power supply module for providing a power supply voltage, wherein the power supply voltage is transmitted to a load through a transmission line; a voltage detection module connected with the transmission line, used for detecting a voltage drop of the transmission line under the action of a surge current, and determining a quality characteristic of the transmission line according to the voltage drop. The line detection device can more accurately and quickly detect the voltage drop caused by micro cracks and other micro abnormalities in the transmission line, determine the quality characteristic of the transmission line according to the voltage drop, determine whether the transmission line is abnormal based on the quality characteristic, and replace the abnormal transmission line according to the detection result, so that the abnormal transmission line does not cause damage such as capacitor breakdown and resistance burnout to electrical equipment using the abnormal transmission line.

Description

Technical Field

[0001] This application relates to the field of semiconductor technology, and in particular to a circuit testing device and a display. Background Technology

[0002] At the instant power is switched on, the input current rapidly charges the primary-side filter capacitor of the electrical equipment, generating a peak current or overload current in the circuit that is much larger than the steady-state current. This peak current or overload current is called surge current.

[0003] Because display devices contain multiple liquid crystal capacitors and pixel capacitors, when the display device's driver module is powered on, a considerable current flows into the capacitors to charge them, causing a momentary surge current phenomenon. If there is an abnormality in the display device's transmission line, such as a microcrack, the large instantaneous surge current passing through the transmission line will still produce a significant voltage drop due to the small impedance caused by the microcrack. When the voltage drops to a certain level, it can lead to capacitor breakdown, resistor burnout, and other abnormalities, damaging the display device.

[0004] However, since the grounding impedance specification for display devices is generally ≤5Ω, the conventional testing method of measuring the line resistance value with a multimeter cannot effectively detect lines with abnormalities such as microcracks. Summary of the Invention

[0005] Therefore, it is necessary to provide a line testing device and display to address the above problems.

[0006] To address the aforementioned problems, this application provides a line testing device, comprising:

[0007] A power supply module is used to provide a power supply voltage, wherein the power supply voltage is transmitted to the load through a transmission line;

[0008] A voltage detection module, connected to the transmission line, is used to detect the voltage drop of the transmission line under the action of surge current, and to determine the quality characteristics of the transmission line based on the voltage drop.

[0009] The line detection device of this application transmits the power supply voltage provided by the power module to the load through the transmission line. When the transmission line experiences a voltage drop under the influence of surge current, the voltage detection module can quickly detect the voltage drop. Compared with the conventional detection method of measuring the resistance value of the line with a multimeter, the line detection device of this application can more accurately and quickly detect the voltage drop caused by minor abnormalities such as microcracks in the transmission line. Based on the voltage drop, the quality characteristics of the transmission line are determined, and based on the quality characteristics, it is determined whether there is an abnormality in the transmission line. Subsequently, the abnormal transmission line can be replaced according to the detection results to avoid damage such as capacitor breakdown and resistor burnout to electrical equipment using the abnormal transmission line.

[0010] In one embodiment, the voltage detection module includes:

[0011] A voltage comparison unit is provided, wherein a first input terminal of the voltage comparison unit is connected to the transmission line to receive the input voltage of the transmission line under the action of surge current, a second input terminal of the voltage comparison unit is used to receive a first preset voltage, and the voltage comparison unit is used to determine the voltage drop based on the input voltage and the first preset voltage.

[0012] A quality determination unit, connected to the output of the voltage comparison unit, is used to determine the quality characteristics of the transmission line based on the voltage drop.

[0013] In one embodiment, the voltage comparison unit includes:

[0014] A voltage comparator, wherein the first input terminal of the voltage comparator is connected to the transmission line, the second input terminal of the voltage comparator is used to receive a first preset voltage, and the output terminal of the voltage comparator is connected to the quality determination unit.

[0015] In one embodiment, the voltage detection module includes:

[0016] An undervoltage lockout unit is provided, wherein a first input terminal of the undervoltage lockout unit is connected to the transmission line to receive the input voltage of the transmission line under the action of surge current, a second input terminal of the undervoltage lockout unit is used to receive a first preset voltage, and the undervoltage lockout unit is used to determine the voltage drop based on the input voltage and the first preset voltage.

[0017] A quality determination unit, connected to the output of the undervoltage lockout unit, is used to determine the quality characteristics of the transmission line based on the voltage drop.

[0018] In one embodiment, the second input terminal of the undervoltage lockout unit is further configured to receive a second preset voltage, and the undervoltage lockout unit is further configured to disconnect the power supply path between the power module and the transmission line when the input voltage of the transmission line under surge current is lower than the second preset voltage.

[0019] In one embodiment, the line detection device further includes:

[0020] The display unit is connected to the voltage detection module and is used to display the detection status of the line under the control of the voltage detection module.

[0021] In one embodiment, the display unit includes at least one LED indicator, and the quality characteristics include qualified and unqualified.

[0022] The voltage detection module is also used to control the LED indicator to display corresponding colors according to the quality characteristics of the transmission line, wherein different quality characteristics correspond to different colors.

[0023] On the other hand, this application also provides a display, including:

[0024] Transmission lines;

[0025] The line detection device described in any of the above embodiments is connected to the transmission line to provide a power supply voltage and to detect the voltage drop of the transmission line under the action of surge current, and to determine the quality characteristics of the transmission line based on the voltage drop.

[0026] A drive circuit is connected to the transmission line; wherein the power supply voltage is transmitted to the drive circuit through the transmission line; and the surge current is generated when the drive circuit is powered on.

[0027] The display of this application includes the line detection device of this application. The power supply voltage provided by the power module of the line detection device is transmitted to the drive circuit through the transmission line. When the drive circuit is powered on and a surge current is generated, the transmission line generates a voltage drop under the action of the surge current. The voltage detection module can quickly detect the voltage drop of the transmission line under the action of the surge current. Compared with the conventional detection method of measuring the resistance value of the line with a multimeter, the line detection device of this application can more accurately and quickly detect the voltage drop caused by micro-cracks and other minor abnormalities in the transmission line. Based on the voltage drop, the quality characteristics of the transmission line are determined, and based on the quality characteristics, it is determined whether there is an abnormality in the transmission line. Subsequently, the abnormal transmission line can be replaced according to the detection results to avoid damage such as capacitor breakdown and resistor burnout to the display of this application.

[0028] In one embodiment, the driving circuit includes at least one of a source driver and a gate driver.

[0029] In one embodiment, when the input voltage of the transmission line under the influence of surge current is less than the minimum start-up voltage of the drive circuit, the drive circuit has no drive output; when the input voltage of the transmission line under the influence of surge current is less than the minimum cut-off voltage of the drive circuit, the drive circuit enters an enabled state. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a line detection device connected to a transmission line in one embodiment;

[0032] Figure 2 This is a schematic diagram of the structure of the line detection device connected to the transmission line in another embodiment;

[0033] Figure 3 This is a schematic diagram of the structure of the line detection device connected to the transmission line in another embodiment;

[0034] Figure 4 This is a schematic diagram of the structure of the line detection device connected to the transmission line in another embodiment;

[0035] Figure 5 This is a schematic diagram of the structure of a display provided in one embodiment.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1-Line detection device; 11-Power supply module; 12-Voltage detection module; 121-Voltage comparison unit; 122-Quality determination unit; 123-Undervoltage lockout unit; 100-Display; 2-Transmission line; 3-Drive circuit. Detailed Implementation

[0038] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate preferred embodiments of the application. However, this application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0040] It should be understood that when a component or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" other components or layers, it may be directly on, adjacent to, connected to, or coupled to other components or layers, or there may be intervening components or layers. Conversely, when a component is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other components or layers, there are no intervening components or layers.

[0041] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “under,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0042] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that when the terms “comprise” and / or “comprising” are used in this specification, the presence of the stated feature, integer, step, operation, element, and / or part is established, but the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or groups is not excluded. Meanwhile, when used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0043] At the instant power is switched on, the input current rapidly charges the primary-side filter capacitor of the electrical equipment, generating a peak current or overload current in the circuit that is much larger than the steady-state current. This peak current or overload current is called surge current.

[0044] Because display devices contain multiple liquid crystal capacitors and pixel capacitors, when the display device's driver module is powered on, a considerable current flows into the capacitors to charge them, causing a momentary surge current phenomenon. If there is an abnormality in the display device's transmission line, such as a microcrack, the large instantaneous surge current passing through the transmission line will still produce a significant voltage drop due to the small impedance caused by the microcrack. When the voltage drops to a certain level, it can lead to capacitor breakdown, resistor burnout, and other abnormalities, damaging the display device.

[0045] However, since the grounding impedance specification for display devices is generally ≤5Ω, the conventional testing method of measuring the line resistance value with a multimeter cannot effectively detect lines with abnormalities such as microcracks.

[0046] Therefore, it is necessary to provide a line testing device and display to address the above problems.

[0047] To solve the above problems, such as Figure 1 As shown, this application provides a line detection device 1, which includes a power supply module 11 and a voltage detection module 12. The power supply module 11 is used to provide a power supply voltage, wherein the power supply voltage is transmitted to the load through the transmission line 2. The voltage detection module 12 is connected to the transmission line 2 and is used to detect the voltage drop of the transmission line 2 under the action of surge current, and determine the quality characteristics of the transmission line 2 based on the voltage drop.

[0048] The quality characteristics of transmission line 2 are determined based on voltage drop. This means that when the power supply voltage is transmitted to the load through transmission line 2 under the action of surge current, the voltage value will decrease, resulting in voltage drop. The voltage drop is related to the resistance of transmission line 2 itself. When transmission line 2 has an abnormality that generates additional resistance, the impact of these additional resistances on the voltage can be represented by the voltage drop. Therefore, the quality characteristics of transmission line 2 can be determined based on voltage drop.

[0049] In the above embodiment, the line detection device 1 transmits the power supply voltage provided by the power module 11 to the load through the transmission line 2. When the transmission line 2 experiences a voltage drop under the action of surge current, the voltage detection module 12 can quickly detect the voltage drop of the transmission line 2 under the action of surge current. Compared with the conventional detection method of measuring the resistance value of the line using a meter, the line detection device 1 of this application can more accurately and quickly detect the voltage drop caused by minor abnormalities such as micro cracks in the transmission line 2, and determine the quality characteristics of the transmission line 2 based on the voltage drop. Based on the quality characteristics, it can be determined whether there is an abnormality in the transmission line 2. Subsequently, the abnormal transmission line 2 can be replaced according to the detection results to avoid damage such as capacitor breakdown and resistor burnout to the electrical equipment using the abnormal transmission line 2.

[0050] In one embodiment, such as Figure 2 As shown, the voltage detection module 12 may include: a voltage comparison unit 121 and a quality determination unit 122; the first input terminal of the voltage comparison unit 121 is connected to the transmission line 2 to receive the input voltage of the transmission line 2 under the action of surge current, the second input terminal of the voltage comparison unit 121 is used to receive a first preset voltage, and the voltage comparison unit 121 is used to determine the voltage drop based on the input voltage and the first preset voltage; the quality determination unit 122 is connected to the output terminal of the voltage comparison unit 121 and is used to determine the quality characteristics of the transmission line 2 based on the voltage drop.

[0051] Among them, under the action of surge current, the voltage value of the power supply voltage will decrease when it is transmitted to the load through transmission line 2. The input voltage refers to the voltage after the power supply voltage is reduced due to the action of surge current through transmission line 2. Since the voltage through transmission line 2 is the voltage provided to the load, this voltage is the input voltage for the load. The first preset voltage refers to the minimum operating voltage of the load. The quality characteristics can be used to characterize whether the current state of the transmission circuit is qualified or unqualified.

[0052] For example, the voltage difference can be determined based on the input voltage and the first preset voltage. If the input voltage is less than the first preset voltage, the voltage difference is less than 0; if the input voltage is greater than the first preset voltage, the voltage difference is greater than or equal to 0. Therefore, determining the quality characteristics of transmission line 2 based on the voltage drop can be understood as follows: if the input voltage is less than the minimum operating voltage of the load, transmission line 2 is deemed unqualified; if the input voltage is greater than the minimum operating voltage of the load, transmission line 2 is deemed qualified.

[0053] For example, the second input terminal of the voltage comparison unit 121 is also used to receive a third preset voltage and a fourth preset voltage. The third preset voltage refers to the highest starting voltage of the load, and the fourth preset voltage refers to the lowest starting voltage of the load. If the input voltage is greater than the highest starting voltage but less than the lowest operating voltage of the load, the operating voltage supplied to the load is unstable, which may easily lead to damage to the load. If the input voltage is lower than the lowest starting voltage, the load will have no output. Furthermore, the voltage comparison unit 121 can issue a high voltage abnormality warning when the input voltage is greater than the highest starting voltage and a low voltage abnormality warning when the input voltage is lower than the lowest starting voltage.

[0054] In one embodiment, the voltage comparison unit 121 may include: a voltage comparator; the first input terminal of the voltage comparator is connected to the transmission line 2, the second input terminal of the voltage comparator is used to receive a first preset voltage, and the output terminal of the voltage comparator is connected to the quality determination unit 122.

[0055] For example, a voltage comparator may include an operational amplifier voltage comparator.

[0056] In other embodiments, such as Figure 3 As shown, the voltage detection module 12 may include: an undervoltage lockout unit 123 and a quality determination unit 122; the first input terminal of the undervoltage lockout unit 123 is connected to the transmission line 2 to receive the input voltage of the transmission line 2 under the action of surge current, the second input terminal of the undervoltage lockout unit 123 is used to receive a first preset voltage, and the undervoltage lockout unit 123 is used to determine the voltage drop according to the input voltage and the first preset voltage; the quality determination unit 122 is connected to the output terminal of the undervoltage lockout unit 123 and is used to determine the quality characteristics of the transmission line 2 according to the voltage drop.

[0057] Among them, under the action of surge current, the voltage value of the power supply voltage will decrease when it is transmitted to the load through transmission line 2. The input voltage refers to the voltage after the power supply voltage is reduced due to the action of surge current through transmission line 2. Since the voltage through transmission line 2 is the voltage provided to the load, this voltage is the input voltage for the load. The first preset voltage refers to the minimum operating voltage of the load. The quality characteristics can be used to characterize whether the current state of the transmission circuit is qualified or unqualified.

[0058] For example, the voltage difference can be determined based on the input voltage and the first preset voltage. If the input voltage is less than the first preset voltage, the voltage difference is less than 0; if the input voltage is greater than the first preset voltage, the voltage difference is greater than or equal to 0. Therefore, determining the quality characteristics of transmission line 2 based on the voltage drop can be understood as follows: if the input voltage is less than the minimum operating voltage of the load, transmission line 2 is deemed unqualified; if the input voltage is greater than the minimum operating voltage of the load, transmission line 2 is deemed qualified.

[0059] In one embodiment, the second input terminal of the undervoltage lockout unit 123 is also used to receive a second preset voltage, and the undervoltage lockout unit 123 is also used to disconnect the power supply path between the power module 11 and the transmission line 2 when the input voltage of the transmission line 2 under surge current is lower than the second preset voltage.

[0060] The second preset voltage refers to the minimum cutoff voltage of the load. When the input voltage is lower than the minimum cutoff voltage, the load enters the cutoff state.

[0061] For example, the undervoltage lockout unit 123 may include an UVLO (Undervoltage-Lockout) circuit.

[0062] In the above embodiment, when the input voltage is lower than the minimum cutoff voltage, the undervoltage lockout unit 123 disconnects the power supply path between the power module 11 and the transmission line 2 to protect the power module 11 and the load.

[0063] For example, the second input terminal of the undervoltage lockout unit 123 is also used to receive a third preset voltage and a fourth preset voltage. The third preset voltage refers to the highest starting voltage of the load, and the fourth preset voltage refers to the lowest starting voltage of the load. If the input voltage is greater than the highest starting voltage but less than the lowest operating voltage of the load, the operating voltage supplied to the load is unstable, which may easily lead to damage to the load. If the input voltage is lower than the lowest starting voltage, the load will have no output.

[0064] In one embodiment, such as Figure 4 As shown, the line detection device 1 also includes a display unit. The display unit is connected to the voltage detection module 12 and is used to display the detection status of the line under the control of the voltage detection module 12.

[0065] For example, the display unit may display at least one of the following methods: indicator light prompts, voice prompts, static screen prompts, dynamic screen prompts, and text prompts.

[0066] In one embodiment, the display unit may include at least one LED indicator, and the quality characteristics include qualified and unqualified; the voltage detection module 12 is also used to control the LED indicator to display the corresponding color according to the quality characteristics of the transmission line 2, wherein different quality characteristics correspond to different colors.

[0067] In the above embodiments, the quality characteristics include qualified and unqualified, and different quality characteristics are displayed in different colors to intuitively show the test results of transmission line 2.

[0068] Based on the same inventive concept, this application also provides a display 100. For example... Figure 5As shown, the display 100 includes: a transmission line 2, a line detection device 1 according to any of the embodiments of this application, and a drive circuit 3. The line detection device 1 is connected to the transmission line 2 and is used to provide a power supply voltage and to detect the voltage drop of the transmission line 2 under the action of surge current, and to determine the quality characteristics of the transmission line 2 based on the voltage drop. The drive circuit 3 is connected to the transmission line 2. The power supply voltage is transmitted to the drive circuit 3 through the transmission line 2. The surge current is generated when the drive circuit 3 is powered on.

[0069] In this circuit testing device 1, the power module 11 is connected to the transmission line 2. The power module 11 provides the power supply voltage, which is transmitted to the drive circuit 3 through the transmission line 2. When the drive circuit 3 is powered on, it generates a surge current. The quality characteristics of the transmission line 2 are determined based on the voltage drop. This means that under the action of the surge current, the voltage value will decrease when the power supply voltage is transmitted to the drive circuit 3 through the transmission line 2, resulting in a voltage drop. The voltage drop is related to the resistance of the transmission line 2 itself. When the transmission line 2 has an abnormality that generates additional resistance, the voltage drop can be used to represent the impact of these additional resistances on the voltage. Therefore, the quality characteristics of the transmission line 2 can be determined based on the voltage drop. The quality characteristics can be used to characterize whether the current state of the transmission circuit is qualified or unqualified.

[0070] For example, the voltage detection module 12 of the line detection device 1 can be used to receive a first preset voltage. Under the action of surge current, the supply voltage will decrease when it is transmitted to the drive circuit 3 through the transmission line 2. The input voltage refers to the voltage after the supply voltage is reduced due to the surge current. Since the voltage through the transmission line 2 is the voltage supplied to the drive circuit 3, this voltage is the input voltage for the drive circuit 3. The first preset voltage refers to the minimum operating voltage of the drive circuit 3. The quality characteristics can be used to characterize whether the current state of the transmission circuit is qualified or unqualified. For example, the voltage difference can be determined based on the input voltage and the first preset voltage. If the input voltage is less than the first preset voltage, the voltage difference is less than 0; if the input voltage is greater than the first preset voltage, the voltage difference is greater than or equal to 0. Therefore, determining the quality characteristics of the transmission line 2 based on the voltage drop can be understood as follows: if the input voltage is less than the minimum operating voltage of the load, the transmission line 2 is deemed unqualified; if the input voltage is greater than the minimum operating voltage of the load, the transmission line 2 is deemed qualified.

[0071] The display 100 in the above embodiment includes the line detection device 1 of this application. The power supply voltage provided by the power module 11 of the line detection device 1 is transmitted to the drive circuit 3 through the transmission line 2. When the drive circuit 3 is powered on and a surge current is generated, the transmission line 2 generates a voltage drop under the action of the surge current. The voltage detection module 12 can quickly detect the voltage drop of the transmission line 2 under the action of the surge current. Compared with the conventional detection method of measuring the resistance value of the line with a meter, the line detection device 1 of this application can more accurately and quickly detect the voltage drop caused by micro-cracks and other minor abnormalities in the transmission line 2, and determine the quality characteristics of the transmission line 2 based on the voltage drop. Based on the quality characteristics, it is determined whether there is an abnormality in the transmission line 2. Subsequently, the abnormal transmission line 2 can be replaced according to the detection results to avoid damage such as capacitor breakdown and resistor burnout to the display 100 of this application.

[0072] In one embodiment, the driving circuit 3 may include at least one of a source driver and a gate driver.

[0073] In one embodiment, when the input voltage of the transmission line 2 under the action of surge current is less than the minimum start-up voltage of the drive circuit 3, the drive circuit 3 has no drive output; when the input voltage of the transmission line 2 under the action of surge current is less than the minimum cut-off voltage of the drive circuit 3, the drive circuit 3 enters the enabled state.

[0074] The voltage detection module 12 of the line detection device 1 can also be used to receive the minimum start-up voltage and minimum cut-off voltage of the drive circuit 3. When the input voltage of the transmission line 2 under the action of surge current is less than the minimum start-up voltage of the drive circuit 3, the drive circuit 3 is controlled to have no drive output. When the input voltage of the transmission line 2 under the action of surge current is less than the minimum cut-off voltage of the drive circuit 3, the drive circuit 3 is controlled to enter the enable state or the cut-off state to protect the display 100.

[0075] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features of the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A circuit testing device, characterized in that, include: A power supply module is used to provide a power supply voltage, wherein the power supply voltage is transmitted to the load through a transmission line; A voltage detection module, connected to the transmission line, is used to detect the voltage drop of the transmission line under the action of surge current, and to determine the quality characteristics of the transmission line based on the voltage drop. A voltage comparison unit is provided, wherein a first input terminal of the voltage comparison unit is connected to the transmission line to receive the input voltage of the transmission line under the action of surge current, and a second input terminal of the voltage comparison unit is used to receive a first preset voltage. The voltage comparison unit is used to determine the voltage drop based on the input voltage and the first preset voltage. The input voltage refers to the voltage after the supply voltage through the transmission line is reduced due to the action of surge current. The first preset voltage refers to the minimum operating voltage of the load. A quality determination unit, connected to the output of the voltage comparison unit, is used to determine the quality characteristics of the transmission line based on the voltage drop; wherein the quality characteristics are used to characterize whether the current state of the transmission line is qualified or unqualified; when the input voltage is less than the first preset voltage, the current state of the transmission line is unqualified; when the input voltage is greater than or equal to the first preset voltage, the current state of the transmission line is qualified.

2. The circuit testing device according to claim 1, characterized in that, The voltage comparison unit includes: A voltage comparator, wherein the first input terminal of the voltage comparator is connected to the transmission line, the second input terminal of the voltage comparator is used to receive a first preset voltage, and the output terminal of the voltage comparator is connected to the quality determination unit.

3. The circuit testing device according to claim 1, characterized in that, The voltage detection module includes: An undervoltage lockout unit is provided, wherein a first input terminal of the undervoltage lockout unit is connected to the transmission line to receive the input voltage of the transmission line under the action of surge current, a second input terminal of the undervoltage lockout unit is used to receive a first preset voltage, and the undervoltage lockout unit is used to determine the voltage drop based on the input voltage and the first preset voltage. A quality determination unit, connected to the output of the undervoltage lockout unit, is used to determine the quality characteristics of the transmission line based on the voltage drop.

4. The circuit testing device according to claim 3, characterized in that, The second input terminal of the undervoltage lockout unit is also used to receive a second preset voltage. The undervoltage lockout unit is also used to disconnect the power supply path between the power module and the transmission line when the input voltage of the transmission line under surge current is lower than the second preset voltage.

5. The circuit testing device according to claim 1, characterized in that, The line detection device also includes: The display unit is connected to the voltage detection module and is used to display the detection status of the line under the control of the voltage detection module.

6. The circuit testing device according to claim 5, characterized in that, The display unit includes at least one LED indicator, and the quality characteristics include qualified and unqualified. The voltage detection module is also used to control the LED indicator to display corresponding colors according to the quality characteristics of the transmission line, wherein different quality characteristics correspond to different colors.

7. A display, characterized in that, include: Transmission lines; The line detection device as described in any one of claims 1 to 6 is connected to the transmission line, used to provide a power supply voltage, and used to detect the voltage drop of the transmission line under the action of surge current, and to determine the quality characteristics of the transmission line based on the voltage drop. A driving circuit is connected to the transmission line; wherein the power supply voltage is transmitted to the driving circuit through the transmission line. The surge current is generated when the drive circuit is powered on.

8. The display according to claim 7, characterized in that, The driving circuit includes at least one of a source driver and a gate driver.

9. The display according to claim 7, characterized in that, When the input voltage of the transmission line under the action of surge current is less than the minimum start-up voltage of the drive circuit, the drive circuit has no drive output; When the input voltage of the transmission line under the action of surge current is less than the minimum cutoff voltage of the drive circuit, the drive circuit enters the enabled state.

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