Abnormality detection device, method, board, and display device for display screen driving circuit

Abstract

The application relates to an abnormality detection device, method, board and display device of a display screen driving circuit. A first voltage signal output when the display screen driving circuit is in a closed state is acquired by using a voltage detection circuit, and whether the display screen driving circuit is closed abnormally is determined by a controller according to whether the first voltage signal is less than a preset closed voltage threshold. When the display screen driving circuit can be normally closed, a start signal is sent to the display screen driving circuit by the controller, and whether the display screen driving circuit is abnormal is determined by the controller according to whether the difference between a second voltage signal and a power supply voltage signal of a power supply is greater than a preset voltage difference threshold, so that the damaged display screen driving circuit is avoided from being misjudged as normal, and the accuracy of the abnormality detection of the display screen driving circuit is improved.

Description

Technical Field

[0001] This invention relates to the field of displays, and in particular to an anomaly detection device, method, circuit board, and display device for a display driving circuit. Background Technology

[0002] The display driver circuit controls the power supply voltage to the display screen based on the control signals from the controller, thereby controlling the display screen's on and off. During wiring tests of the display screen board, abnormal wiring or short circuits between interfaces can cause excessive current to the display screen, potentially damaging the driver circuit and affecting the normal on / off operation of the display screen.

[0003] Existing technology determines whether the display driver circuit is abnormal by detecting whether it can drive the display normally. However, when the display driver circuit is damaged but not completely destroyed, although it can still drive the display normally, abnormalities such as black screen may occur during subsequent use, posing a safety hazard to the normal use of the display. Summary of the Invention

[0004] This application provides an anomaly detection device, method, circuit board, and display device for a display screen driving circuit, which can improve the accuracy and security of anomaly detection in the display screen driving circuit. The technical solution is as follows:

[0005] In a first aspect, embodiments of this application provide an anomaly detection device for a display screen driving circuit, including a controller and a voltage detection circuit: the controller is connected to the output terminal of the voltage detection circuit and the input terminal of the display screen driving circuit; the input terminal of the voltage detection circuit is connected to the output terminal of the display screen driving circuit; the input terminal of the display screen driving circuit is connected to a power supply, and the output terminal of the display screen driving circuit is connected to the power supply terminal of the display screen.

[0006] The voltage detection circuit is used to detect the voltage signal output by the display screen driving circuit;

[0007] The controller obtains a first voltage signal output by the display driving circuit when it is in the off state through the voltage detection circuit. The controller determines whether the first voltage signal is less than a preset off voltage threshold. If the first voltage signal is less than the preset off voltage threshold, the controller sends a start signal to the display driving circuit and obtains a second voltage signal output by the display driving circuit when it is in the on state through the voltage detection circuit. The controller determines whether the difference between the second voltage signal and the power supply voltage signal is greater than a preset voltage difference threshold. If the difference between the second voltage signal and the power supply voltage signal is greater than the preset voltage difference threshold, the controller determines that the display driving circuit is abnormal.

[0008] Secondly, embodiments of this application provide an anomaly detection method for a display screen driving circuit. The input terminal of the display screen driving circuit is connected to a power supply, and the output terminal of the display screen driving circuit is connected to the power supply terminal of the display screen. The method includes the following steps:

[0009] Obtain the first voltage signal output when the display screen driving circuit is in the off state;

[0010] If the first voltage signal is less than the preset shutdown voltage threshold, a start signal is sent to the display driving circuit to obtain the second voltage signal output by the display driving circuit when it is in the on state;

[0011] If the difference between the second voltage signal and the power supply voltage signal is greater than a preset voltage difference threshold, the display screen driving circuit is determined to be abnormal.

[0012] Thirdly, embodiments of this application provide a display board, including a display driving circuit and an anomaly detection device for the display driving circuit as described in any of the above claims;

[0013] The input terminal of the display driving circuit is connected to the power supply and the controller of the display driving circuit fault detection device, respectively, and the output terminal of the display driving circuit is connected to the power supply terminal of the display screen.

[0014] Fourthly, embodiments of this application provide a display device, including a display board and a display screen as described above;

[0015] The power supply terminal of the display screen is connected to the output terminal of the display screen driving circuit.

[0016] In this embodiment, a voltage detection circuit is used to acquire a first voltage signal output when the display driver circuit is in the off state. A controller determines whether the display driver circuit is abnormally shut down based on whether the first voltage signal is less than a preset shutdown voltage threshold. When the display driver circuit can be shut down normally, the controller sends a start signal to the display driver circuit, thereby avoiding circuit damage caused by opening the circuit when the display driver circuit is abnormally shut down, and improving the safety of display driver circuit anomaly detection. Furthermore, this application uses a voltage detection circuit to acquire a second voltage signal output when the display driver circuit is in the on state. The controller determines whether the display driver circuit is abnormal based on whether the difference between the second voltage signal and the power supply voltage signal is greater than a preset voltage difference threshold, avoiding the damaged display driver circuit being mistakenly judged as normal, and improving the accuracy of display driver circuit anomaly detection.

[0017] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an anomaly detection device for a display screen driving circuit according to an embodiment of the present invention;

[0019] Figure 2 This is a circuit diagram of a voltage detection circuit according to an embodiment of the present invention;

[0020] Figure 3 This is a circuit diagram of a display screen driving circuit according to an embodiment of the present invention;

[0021] Figure 4 The circuit diagram is shown for an alarm circuit according to an embodiment of the present invention;

[0022] Figure 5 This is a flowchart of an anomaly detection method for a display screen driving circuit according to an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of a display board according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of a display device according to an embodiment of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0026] It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of the embodiments of this application.

[0027] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0028] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and circuits consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] Furthermore, in the description of this application, unless otherwise stated, "several" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0030] In the manufacturing process of monitor boards, screen cables are typically used to test the wiring of the produced display boards. During the wiring test, multiple plugging and unplugging are often required, which can easily cause the gold fingers of the display board to partially detach and come into contact with other gold fingers. After power-on, this can cause a short circuit and damage the components of the display drive circuit. Alternatively, when matching the display board with the screen, abnormal matching parameters can cause excessive inrush current when the screen drive circuit is turned on, damaging the components of the display drive circuit and causing abnormalities in the display drive circuit, affecting the normal power-on or power-off of the display.

[0031] The display driver circuit controls the supply voltage to the display screen based on the control signals from the controller, thereby controlling the display screen's on and off. Abnormalities in the display driver circuit typically include complete failure and damage. When the display driver circuit is completely failed, there is no output voltage after power-on, and the display screen cannot display normally. Such abnormalities are easily detected during testing. However, when the display driver circuit is damaged, although it can still drive the display screen normally, abnormalities such as black screens are likely to occur during subsequent use. These abnormalities are not easily detected during testing, potentially leading to defective samples entering the market and affecting the manufacturer's product quality and brand reputation.

[0032] Therefore, for the above issues, please refer to [link / reference]. Figure 1 This application provides an anomaly detection device for a display screen driving circuit, including a controller 101 and a voltage detection circuit 102:

[0033] The controller 101 is connected to the output terminal of the voltage detection circuit 102 and the input terminal of the display screen driving circuit; the input terminal of the voltage detection circuit 102 is connected to the output terminal of the display screen driving circuit; the input terminal of the display screen driving circuit is connected to the power supply, and the output terminal of the display screen driving circuit is connected to the power supply terminal of the display screen.

[0034] The voltage detection circuit 102 is used to detect the voltage signal output by the display screen driver circuit;

[0035] The controller 101 obtains the first voltage signal output by the display driving circuit when it is in the off state through the voltage detection circuit 102. The controller 101 determines whether the first voltage signal is less than a preset off voltage threshold. If the first voltage signal is less than the preset off voltage threshold, the controller 101 sends a start signal to the display driving circuit and obtains the second voltage signal output by the display driving circuit when it is in the on state through the voltage detection circuit. The controller 101 determines whether the difference between the second voltage signal and the power supply voltage signal is greater than a preset voltage difference threshold. If the difference between the second voltage signal and the power supply voltage signal is greater than the preset voltage difference threshold, the controller determines that the display driving circuit is abnormal.

[0036] The controller 101 can be a control chip or a chipset consisting of multiple control chips that performs the functions described above in this application. In one embodiment, the controller 101 can be an STM8 microcontroller.

[0037] The voltage detection circuit 102 can be used to convert the signal output by the display driving circuit into a voltage signal that can be recognized by the controller 101. The voltage detection circuit 102 can be a circuit composed of at least one sampling resistor. The number and resistance value of the sampling resistor can be determined according to the voltage range supported by the analog-to-digital converter of the controller 101. The voltage detection circuit 102 converts the voltage signal output by the display driving circuit into a voltage signal that meets the input voltage range of the ADC module of the controller 101 by setting multiple sampling resistors.

[0038] Specifically, such as Figure 2 The diagram shown is a circuit diagram of a voltage detection circuit 102 according to one embodiment; the voltage detection circuit 102 includes resistors R6-R7 and capacitor C3.

[0039] The first end of resistor R6 is connected to the output terminal of the display driving circuit. The second end of resistor R6 is connected to the first end of resistor R7 and the first end of capacitor C3 respectively. The second end of resistor R7 and the second end of capacitor C3 are grounded. The second end of resistor R6 outputs the first voltage signal to the analog-to-digital converter (ADC) of controller 101.

[0040] The voltage detection circuit 102 reads the output voltage signal VCC_PANEL of the display screen driver circuit, and outputs a voltage signal that can be recognized by the analog-to-digital converter (ADC) of the controller 101 after being divided by resistors R6-R7.

[0041] The resistors R6 and R7 can be determined according to the voltage range supported by the analog-to-digital converter of the controller 101. In this embodiment, when the controller 101 is an STM8 microcontroller, the voltage input range of its analog-to-digital converter (ADC) is 0-3.3V, while the voltage signal output by the display driving circuit is at most 12V and at least 3.3V, which exceeds the input voltage range of the STM8 microcontroller's ADC. In this case, the resistance of resistor R6 can be set to 1KΩ and the resistance of resistor R7 can be set to 1KΩ, so that the voltage signal output by the voltage detection circuit 102 is at least 0.825V and at most 3V, which meets the input voltage range of the controller 101's ADC.

[0042] The display screen driver circuit is used to output a power supply voltage to the power supply terminal of the display screen according to the control signal of the controller 101, so as to control the opening and closing of the display screen.

[0043] Specifically, when the display driver circuit receives a high-level signal from the controller, it provides a power supply voltage signal to the power supply terminal of the display, and the display is powered on and displays; when the display driver circuit receives a low-level signal from the controller, it stops providing a power supply voltage signal to the power supply terminal of the display, and the display is in a closed state; or, when the display driver circuit receives a low-level signal from the controller, it provides a power supply voltage signal to the power supply terminal of the display, and the display is powered on and displays; when the display driver circuit receives a high-level signal from the controller, it stops providing a power supply voltage signal to the power supply terminal of the display, and the display is in a closed state.

[0044] In one embodiment, the display driving circuit can be a switching circuit, which turns the connection circuit between the power supply and the power supply terminal of the display screen on or off according to the signal from the controller, thereby adjusting the voltage signal output to the power supply terminal of the display screen; in other embodiments, the user can adjust the circuit structure of the display driving circuit according to actual needs, as long as the display driving circuit can meet the above-mentioned functions of this application.

[0045] The display driver circuit is in the off state when the voltage signal output by the display driver circuit is infinitely close to 0. In this case, the display screen has no power supply and is in the off state.

[0046] The shutdown voltage threshold can be set to a voltage threshold close to 0. When the first voltage signal is detected to be less than the shutdown voltage threshold, it is determined that the display driving circuit is in the shutdown state and that the display driving circuit can be shut down normally.

[0047] The start signal is used to control the display drive circuit to turn on. When the display drive circuit is in the on state, the display drive circuit outputs a second voltage signal to the power supply terminal of the display, and the display is powered on and displays.

[0048] When the display driving circuit is in the on state, the second voltage signal output by the display driving circuit can be the same as the power supply voltage signal, or the second voltage signal output by the display driving circuit can be the voltage signal obtained after the power supply voltage signal has undergone a certain circuit loss. When the difference between the second voltage signal and the power supply voltage signal is large, that is, the circuit loss of the display driving circuit exceeds the normal circuit loss, the display driving circuit is determined to be abnormal.

[0049] The power supply voltage signal can be obtained by reading the corresponding display model and according to the pre-stored voltage parameters of the display board. For example, when the display is powered by 3.3V, as long as the second voltage signal is within 2.8V to 3.79V, the display driving circuit is considered normal; when the display is powered by 5V, as long as the second voltage signal is within 4.25V to 5.75V, the display driving circuit is considered normal. Alternatively, in another embodiment, the power supply voltage signal can be directly set to a minimum display power supply voltage threshold, such as 2.5V. When the second voltage signal is less than 2.5V, the display driving circuit is considered abnormal. Alternatively, in another embodiment, a voltage detection circuit can be set at the power supply to detect the power supply voltage signal. The voltage detection circuit can use existing voltage detection elements to obtain the power supply voltage signal detected by the circuit. When the difference between the second voltage signal and the power supply voltage signal is less than 10%, the display driving circuit is considered normal.

[0050] The voltage difference threshold can be determined based on the specific structure of the display driving circuit. In one embodiment, when the display driving circuit is a switching circuit used to connect the power supply to the power supply terminal of the display, the voltage difference threshold can be set to 1V.

[0051] In this embodiment, a voltage detection circuit is used to acquire a first voltage signal output when the display driver circuit is in the off state. A controller determines whether the display driver circuit is abnormally shut down based on whether the first voltage signal is less than a preset shutdown voltage threshold. When the display driver circuit can be shut down normally, the controller sends a start signal to the display driver circuit, thereby avoiding circuit damage caused by opening the circuit when the display driver circuit is abnormally shut down, and improving the safety of display driver circuit anomaly detection. Furthermore, this application uses a voltage detection circuit to acquire a second voltage signal output when the display driver circuit is in the on state. The controller determines whether the display driver circuit is abnormal based on whether the difference between the second voltage signal and the power supply voltage signal is greater than a preset voltage difference threshold, avoiding the damaged display driver circuit being mistakenly judged as normal, and improving the accuracy of display driver circuit anomaly detection.

[0052] In one embodiment, the display driving circuit is a switching circuit composed of resistors and switching elements such as transistors and MOSFETs. The display driving circuit turns the connection circuit between the power supply and the power supply terminal of the display screen on or off according to the signal of the controller, thereby adjusting the voltage signal output to the power supply terminal of the display screen. Specifically, the display driving circuit may include: a third resistor, a fourth resistor, a transistor, and a MOSFET.

[0053] The base of the transistor is connected to the controller through the third resistor. The collector of the transistor is connected to the first end of the fourth resistor and the gate of the MOSFET. The second end of the fourth resistor is connected to the power supply. The emitter of the transistor is grounded.

[0054] The drain of the MOSFET is connected to the input terminal of the voltage detection circuit, and the source of the MOSFET is connected to the power supply.

[0055] Among them, the MOS transistor can be a PMOS transistor, and the transistor can be an NPN transistor. When the NPN transistor is turned on, the voltage at the collector of the NPN transistor is close to ground, which makes the drain and source of the PMOS transistor conduct. The drain of the MOS transistor outputs a voltage signal to the power supply terminal of the display screen, and the display screen is powered on and displays.

[0056] like Figure 3 The diagram shown is a circuit diagram of a display screen driving circuit according to one embodiment. The display screen driving circuit includes: resistors R1-R5, PMOS transistor UM1, NPN transistor Q1, and capacitors C1-C2.

[0057] The base of NPN transistor Q1 is connected to the controller through resistor R1, and the base of NPN transistor Q1 is grounded through resistor R4. The collector of NPN transistor Q1 is connected to the second terminal of resistor R3 and the gate of PMOS transistor UM1. The first terminal of resistor R3 is connected to the power supply. The emitter of NPN transistor Q1 is grounded. The drain of PMOS transistor UM1 is connected to the first terminal of capacitor C1, the first terminal of capacitor C2, the first terminal of resistor R5, and the input terminal of the voltage detection circuit. The second terminals of capacitor C1, capacitor C2, and resistor R5 are grounded. The source of PMOS transistor UM1 is connected to the power supply.

[0058] The controller outputs a control signal PANEL_EN_IC to control the NPN transistor Q1 to turn on or off. Specifically, when the controller output signal PANEL_EN_IC is high, the NPN transistor Q1 is on. At this time, the voltage at the collector of the NPN transistor is close to ground, causing the drain and source of the PMOS transistor UM1 to conduct. The drain of the PMOS transistor UM1 outputs a high voltage signal VCC_PANEL to the power supply terminal of the display screen, and the display screen powers on and displays. When the controller output signal PANEL_EN_IC is low, the NPN transistor Q1 is off, the voltage at the collector of the NPN transistor Q1 is close to a high voltage, causing the drain and source of the PMOS transistor UM1 to not conduct. The drain of the PMOS transistor UM1 outputs a low voltage signal VCC_PANEL to the power supply terminal of the display screen, and the display screen does not display.

[0059] When the display driver circuit is damaged or malfunctions, it may result in no output voltage signal or an excessively low output voltage signal, causing the display to go black. Such anomalies are difficult to distinguish in the existing display manufacturing process, which is not conducive to manufacturers monitoring abnormal data. Therefore, in order to address the above problems, this application provides an anomaly detection device for the display driver circuit, which can detect and distinguish various abnormal conditions of the display driver circuit, thereby improving the accuracy of anomaly detection.

[0060] Specifically, the abnormality of the display driving circuit in this application includes damage to the display driving circuit and injury to the display driving circuit.

[0061] If the controller determines that the second voltage signal is less than or equal to the minimum power supply voltage threshold, it determines that the display screen driving circuit is damaged.

[0062] If the controller determines that the second voltage signal is greater than the minimum power supply voltage threshold, and the difference between the second voltage signal and the power supply voltage signal is greater than a preset voltage difference threshold, it determines that the display screen driving circuit is damaged.

[0063] When the display driver circuit is completely damaged, the display driver circuit has no output voltage signal or the output voltage signal is too low. Therefore, when the second voltage signal is less than or equal to the minimum supply voltage threshold, it is determined that the display driver circuit is damaged.

[0064] The minimum power supply voltage threshold can be set to a value close to 0. When the second voltage signal is less than or equal to the minimum power supply voltage threshold, it is determined that the display drive circuit has no output voltage signal, and the display drive circuit is determined to be damaged.

[0065] When the display driving circuit is damaged, the conduction of the display driving circuit is large, resulting in a decrease in the output voltage signal. Therefore, in this application, the damage to the display driving circuit is determined by detecting whether the difference between the second voltage signal and the power supply voltage signal is greater than a preset voltage difference threshold.

[0066] In this embodiment, the controller compares the second voltage signal with the minimum supply voltage threshold and the supply voltage signal to determine whether the abnormality of the display drive circuit is damaged or completely damaged. This facilitates the user to collect abnormal information of the display drive circuit to analyze the cause of the abnormality and improve the production quality of the display board.

[0067] When the display driving circuit is in an abnormal conduction state, although the display can still display normally, it is easy to cause unnecessary power loss because the display is in a long-term on or standby state. The above-mentioned abnormality is difficult to detect in the existing display manufacturing process. Therefore, in order to address the above problems, this application provides an abnormality detection device for the display driving circuit, which can detect various abnormalities of the display driving circuit to improve the accuracy of abnormality detection.

[0068] Specifically, before sending a start signal to the display screen driver circuit, the controller further includes:

[0069] If the controller determines that the first voltage signal is greater than a preset shutdown voltage threshold, it determines that the display drive circuit is abnormal, and the controller stops sending start signals to the display drive circuit.

[0070] Normally, when the display driver circuit is in the off state, the output first voltage signal should be close to 0. However, if the display driver circuit malfunctions, such as in a short-circuit state, the output first voltage signal will be much greater than 0. Therefore, if the display driver circuit is started in this situation, it may burn out the circuit, creating a safety hazard. Therefore, in this embodiment, when the first voltage signal exceeds a preset shutdown voltage threshold, an abnormal shutdown of the display driver circuit is determined, and the controller stops sending startup signals to the display driver circuit, thereby improving the safety of display driver circuit malfunction detection.

[0071] Preferably, the abnormality detection device for the display screen driving circuit further includes a transmission circuit connected to the controller;

[0072] If the controller determines that the display screen driving circuit is abnormal, it records the power supply voltage signal of the power supply and the first voltage signal output by the display screen driving circuit, generates abnormal detection data, and sends it to the server through the transmission circuit.

[0073] The transmission circuit can be a Bluetooth transmission circuit, a wireless transmission circuit, or other circuits or circuit modules that can transmit data to a server. In this embodiment, the transmission circuit is a wireless transmission circuit, which uploads the anomaly detection data to the server by connecting to a network.

[0074] The anomaly detection data here can include the power supply voltage signal of the power supply when the anomaly occurs and the first voltage signal output by the display drive circuit. Users can collect and analyze the above anomaly detection data to find the cause of the display drive circuit anomaly, thereby adjusting the production process or manufacturing technology and improving the production efficiency and quality of the display board.

[0075] In one embodiment, the anomaly detection device for the display driving circuit further includes an alarm circuit connected to the controller;

[0076] If the controller determines that the display screen driving circuit is abnormal, it controls the alarm circuit to issue an alarm signal.

[0077] Alarm circuits may include alarm components such as buzzers and indicator lights, which can be used to alert users to abnormalities in the display screen driver circuit.

[0078] like Figure 4 The figure shows a circuit diagram of an alarm circuit in one embodiment. As shown, the alarm circuit includes resistors R8-R11, capacitors C4-C5, transistors Q2-Q3, and indicator lights LED1-LED2.

[0079] The base of transistor Q2 is connected to the second terminal of resistor R11. The first terminal of resistor R11 is connected to the controller and the second terminal of resistor R8. The first terminal of resistor R8 is connected to the power supply. The collector of transistor Q2 is connected to the second terminal of resistor R9, the first terminal of resistor R10, the first terminal of capacitor C4, and the anode of indicator LED1. The first terminal of resistor R9 is connected to the power supply, and the second terminal of capacitor C4 is grounded. The second terminal of resistor R10 is connected to the base of transistor Q3. The cathode of indicator LED1 is grounded. The collector of transistor Q3 is connected to the second terminal of resistor R12, the first terminal of capacitor C5, and the anode of indicator LED2. The first terminal of resistor R12 is connected to the power supply, and the second terminal of capacitor C5 is grounded. The cathode of indicator LED2 is grounded.

[0080] In this application, indicator lights LED1-LED2 can be indicator lights of the same or different colors. For example, indicator light LED1 can be a red indicator light, and indicator light LED2 can be a green indicator light. The display mode of indicator lights LED1-LED2 can be set according to user needs. For example, it can be set to flashing or constant light. The flashing duration can be set according to actual production needs. For example, it can be set to flash for 3 seconds.

[0081] When the controller detects an abnormality in the display driver circuit, it inputs a control signal LED_ON_IC1 with a high-low level interval to the alarm circuit, causing indicator lights LED1-LED2 to flash at certain intervals to alert the user of the abnormality. This allows the user to monitor and handle abnormalities in the display driver circuit in a timely manner, thereby improving production efficiency.

[0082] like Figure 5 As shown in the illustration, this application also provides a method for detecting anomalies in a display screen driving circuit. This method can be applied to the aforementioned device for detecting anomalies in the display screen driving circuit, and is used to detect anomalies in the display screen driving circuit. The input terminal of the display screen driving circuit is connected to a power supply, and the output terminal of the display screen driving circuit is connected to the power supply terminal of the display screen. The method includes the following steps:

[0083] Step S101: Obtain the first voltage signal output by the display screen driving circuit when it is in the off state;

[0084] Step S102: If the first voltage signal is less than the preset shutdown voltage threshold, send a start signal to the display driving circuit and obtain the second voltage signal output by the display driving circuit when it is in the on state;

[0085] Step S103: If the difference between the second voltage signal and the power supply voltage signal is greater than a preset voltage difference threshold, the display screen driving circuit is determined to be abnormal.

[0086] like Figure 6 As shown, this application embodiment also provides a display board 200, including a display driving circuit 201 and an anomaly detection device 202 for the display driving circuit as described in any of the above claims;

[0087] The input terminal of the display driving circuit 201 is connected to the power supply and the controller of the abnormal detection device 202 of the display driving circuit, respectively, and the output terminal of the display driving circuit 201 is connected to the power supply terminal of the display screen.

[0088] like Figure 7 As shown, this application embodiment also provides a display device 300, including the above-mentioned display board 301 and display screen 302;

[0089] The power supply terminal of the display screen 302 is connected to the output terminal of the display screen driving circuit.

[0090] The abnormal detection device, method, board, and display device of the display driver circuit of this application can accurately monitor various abnormal states of the display driver circuit of the display board and issue alarms in a timely manner for abnormal states, preventing abnormal samples from entering the market and affecting the manufacturer's production quality and reputation. Furthermore, the abnormal detection data of various abnormal states is uploaded to the server through the transmission circuit, so that relevant personnel can analyze the causes of abnormalities, monitor production quality, and adjust the production process in a timely manner based on the abnormal detection data, thereby improving production efficiency and quality. The abnormal detection device of the display driver circuit of this application has a simple structure, low cost, and good application prospects.

[0091] This invention is not limited to the above-described embodiments. If any modifications or variations to this invention do not depart from the spirit and scope of this invention, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this invention, then this invention also intends to include such modifications and variations.

Claims

1. A fault detection device for a display screen driving circuit, characterized in that, It includes a controller and a voltage detection circuit: the controller is connected to the output terminal of the voltage detection circuit and the input terminal of the display screen driving circuit; the input terminal of the voltage detection circuit is connected to the output terminal of the display screen driving circuit; the input terminal of the display screen driving circuit is connected to the power supply, and the output terminal of the display screen driving circuit is connected to the power supply terminal of the display screen. The voltage detection circuit is used to detect the voltage signal output by the display screen driving circuit; The controller obtains a first voltage signal output by the display driving circuit when it is in the off state through the voltage detection circuit. The controller determines whether the first voltage signal is less than a preset off voltage threshold. If the first voltage signal is less than the preset off voltage threshold, the controller sends a start signal to the display driving circuit and obtains a second voltage signal output by the display driving circuit when it is in the on state through the voltage detection circuit. The controller determines whether the difference between the second voltage signal and the power supply voltage signal is greater than a preset voltage difference threshold. If the difference between the second voltage signal and the power supply voltage signal is greater than the preset voltage difference threshold, the controller determines that the display driving circuit is abnormal.

2. The abnormality detection device for the display screen driving circuit according to claim 1, characterized in that, The abnormality of the display drive circuit includes damage to the display drive circuit and injury to the display drive circuit. If the controller determines that the second voltage signal is less than or equal to the minimum power supply voltage threshold, it determines that the display screen driving circuit is damaged. If the controller determines that the second voltage signal is greater than the minimum power supply voltage threshold, and the difference between the second voltage signal and the power supply voltage signal is greater than a preset voltage difference threshold, it determines that the display screen driving circuit is damaged.

3. The abnormality detection device for the display screen driving circuit according to claim 1, characterized in that, Before sending a start signal to the display screen driver circuit, the controller further includes: If the controller determines that the first voltage signal is greater than a preset shutdown voltage threshold, it determines that the display drive circuit is abnormal, and the controller stops sending start signals to the display drive circuit.

4. The abnormality detection device for the display screen driving circuit according to claim 1, characterized in that, It also includes a transmission circuit connected to the controller; If the controller determines that the display screen driving circuit is abnormal, it records the power supply voltage signal of the power supply and the first voltage signal output by the display screen driving circuit, generates abnormal detection data, and sends it to the server through the transmission circuit.

5. The abnormality detection device for the display screen driving circuit according to claim 1, characterized in that, The voltage detection circuit includes a first resistor, a second resistor, and a first capacitor; The first end of the first resistor is connected to the output end of the display screen driving circuit. The second end of the first resistor is connected to the first end of the second resistor and the first end of the first capacitor. The second end of the second resistor and the second end of the first capacitor are grounded. The second end of the first resistor outputs a first voltage signal to the controller.

6. The fault detection device for the display screen driving circuit according to any one of claims 1-5, characterized in that, It also includes an alarm circuit connected to the controller; If the controller determines that the display screen driving circuit is abnormal, it controls the alarm circuit to issue an alarm signal.

7. The abnormality detection device for the display screen driving circuit according to any one of claims 1-5, characterized in that, The display screen driving circuit includes: a third resistor, a fourth resistor, a transistor, and a MOSFET; The base of the transistor is connected to the controller through a third resistor, the collector of the transistor is connected to the second end of a fourth resistor and the gate of the MOS transistor, the first end of the fourth resistor is connected to the power supply, and the emitter of the transistor is grounded. The drain of the MOSFET is connected to the input terminal of the voltage detection circuit, and the source of the MOSFET is connected to the power supply.

8. A method for detecting anomalies in a display screen driving circuit, characterized in that, The input terminal of the display driving circuit is connected to the power supply, and the output terminal of the display driving circuit is connected to the power supply terminal of the display screen. The method includes the following steps: Obtain the first voltage signal output when the display screen driving circuit is in the off state; If the first voltage signal is less than the preset shutdown voltage threshold, a start signal is sent to the display driving circuit to obtain the second voltage signal output by the display driving circuit when it is in the on state; If the difference between the second voltage signal and the power supply voltage signal is greater than a preset voltage difference threshold, the display screen driving circuit is determined to be abnormal.

9. A display board, comprising a display driving circuit and an anomaly detection device for the display driving circuit as described in any one of claims 1-7; in, The input terminal of the display driving circuit is connected to the power supply and the controller of the display driving circuit fault detection device, respectively, and the output terminal of the display driving circuit is connected to the power supply terminal of the display screen.

10. A display device, comprising a display board and a display screen as described in claim 9; in, The power supply terminal of the display screen is connected to the output terminal of the display screen driving circuit.

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