Self-locking display screen connector

Abstract

The invention relates to a self-locking display screen connector, which structurally and mainly comprises a display screen interface module, a signal generation and acquisition unit, an impedance analysis unit, an anomaly detection unit, a control logic unit and a repair execution mechanism, and is characterized in that the signal generation and acquisition unit applies a sweep frequency signal to a resonance network module; the impedance analysis unit receives and processes response signal data from the signal generation and acquisition unit, and extracts impedance characteristics; the abnormity detection unit judges the contact state of the connector based on the impedance characteristic; the control logic unit receives the judgment result and decides whether to start repair or not; and the repair execution mechanism acts on a contact of the display screen interface module or a nearby area according to an instruction of the control logic unit so as to execute repair operation. According to the invention, active monitoring of the contact state can be realized, and the display screen connector is automatically repaired when abnormity is detected, so that the connection reliability of the display screen connector is improved, the service life is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electronic connectors, and in particular to a self-locking display screen connector. Background Art

[0002] Electronic connectors are essential components in modern electronic devices. They are responsible for establishing separable electrical pathways between different circuit units to achieve reliable transmission of signals and electrical energy. Especially in the field of display technology, with the continuous improvement of display resolution, refresh rate and color depth, higher requirements are placed on the data transmission rate and signal integrity of connectors. As a key bridge between the display panel and the drive circuit, the performance of the display connector directly affects the final display effect and user experience.

[0003] In actual applications, display connectors face complex working environments, among which high humidity environments are a prominent challenge. Long-term exposure to high humidity air can easily cause electrochemical reactions on the surface of the connector's metal contacts, forming oxide films or corrosion products, leading to oxidation corrosion of the contact surface. Over time, the accumulation of oxide films will significantly increase the contact resistance and even cause unstable contact. Increased contact resistance has an adverse effect on the performance of display connectors. When high-frequency signals are transmitted, it will cause signal attenuation, reflection and distortion, destroy signal integrity, and cause display problems such as image flickering and color anomalies. In severe cases, it may cause signal transmission interruption, resulting in a black screen or the device failing to work properly. In addition, increasing contact resistance will also increase power consumption and heat generation, posing safety risks.

[0004] The existing technology mainly adopts the following strategies to deal with contact surface oxidation corrosion:

[0005] 1. Material selection and surface treatment: Precious metals (such as gold) are commonly used for electroplating, which has excellent resistance to oxidation and corrosion. However, gold is expensive, and the gold-plated layer may wear or produce pores in harsh environments, causing corrosion of the underlying metal.

[0006] 2. Anti-corrosion coating or lubricant: Form a physical barrier on the surface of the contact parts to isolate the contact surface from the environment and reduce plug-in wear. However, this type of coating or lubricant may affect the stability of contact resistance, and its durability is limited by the working environment and usage conditions.

[0007] 3. Enhanced mechanical structure design: Use highly elastic contact springs or reliable locking mechanisms to ensure close and stable physical contact between contact parts. A larger positive force can puncture or squeeze open a thin oxide film to a certain extent, but has limited effect on a thicker oxide layer, and excessive positive force may accelerate the wear of the contact parts.

[0008] Although the above technologies alleviate the problem of poor contact of connectors to a certain extent, they mainly focus on preventing the occurrence of oxidation corrosion or delaying its process, lacking the ability to monitor the change of contact status in real time and actively repair after the problem occurs. Once the protective measures fail or age, the connectors will still have poor contact, and this kind of failure is often sudden, making it difficult for users to perceive in advance. When a failure occurs, it is usually only possible to solve the problem by replacing the connector or the entire device component, resulting in high maintenance costs and equipment downtime. Summary of the Invention

[0009] To solve the above technical problems existing in the prior art, the present invention provides a self-locking display connector solution, which can actively monitor the contact status and automatically repair the display connector when an abnormality is detected, so as to improve the connection reliability of the display connector, extend the service life, and reduce the maintenance cost.

[0010] A self-locking display connector of the present invention, a display interface module, having main signal contacts for connecting to a display and contacts associated with a monitoring and repair circuit;

[0011] A signal generation and acquisition unit, electrically connected to the resonant network module, configured to generate a swept-frequency signal covering a preset frequency range and inject it into the resonant network module, and acquire the response signal of the resonant network module;

[0012] An impedance analysis unit, electrically connected to the signal generation and acquisition unit, configured to process the response signal to determine the impedance spectrum characteristics of the resonant network module within the swept-frequency range;

[0013] An abnormality detection unit, electrically connected to the impedance analysis unit, configured to compare the determined impedance spectrum characteristics with a preset reference to detect whether there is a resonant peak shift or change indicating an abnormal contact status of the connector;

[0014] A control logic unit, electrically connected to the abnormality detection unit, configured to generate a control instruction according to the detection result of the abnormality detection unit;

[0015] A repair actuator, electrically connected to the control logic unit and the display interface module, configured to perform at least one repair operation aimed at improving the contact status of the connector in response to the control instruction generated by the control logic unit;

[0016] Among them, the signal generation and acquisition unit applies a swept-frequency signal to the resonant network module; the impedance analysis unit receives and processes the response signal data from the signal generation and acquisition unit, and extracts impedance characteristics; the abnormality detection unit determines the contact state of the connector based on the impedance characteristics; the control logic unit receives the judgment result and decides whether to initiate repair; the repair actuator acts on the contacts of the display interface module or the area near them according to the instructions of the control logic unit to perform repair operations, so as to achieve active monitoring and adaptive repair of the connector contact state.

[0017] Regarding the solution of claim 2 in the claims, by connecting the first resonant branch (L1, C1) and the second resonant branch (L2, C2) in parallel, this connector can construct a dual-band resonant network. The first resonant branch is designed to resonate at a lower frequency (about 1 MHz) and is more sensitive to the change in the overall contact resistance of the connector, and can effectively detect the overall poor contact caused by oxidation and corrosion at the macroscopic level of the connector contact surface; while the second resonant branch is designed to resonate at a higher frequency (about 10 MHz) and is more sensitive to the changes at the microscopic level of the contact surface, such as slight oxide films or subtle changes in contact pressure. This dual-band design enables the impedance analysis unit to obtain more comprehensive and finer impedance spectrum characteristics, so as to more accurately identify the degree and type of deterioration of the connector contact state, and improve the sensitivity and accuracy of abnormality detection. The resonant network module is connected in parallel to the power supply pins of the display interface module and is connected using current-limiting resistors (R1, R2). On the one hand, it is convenient for signal injection and acquisition of response signals. The settings of measurement points A and B facilitate the direct access of the gain and phase detectors, simplify the circuit design, and reduce the implementation difficulty; on the other hand, through the current-limiting resistors, it is ensured that during impedance detection, it will not have a significant impact on the normal power supply, and the normal operation of the display connector is guaranteed without interference. In summary, the above technical solution realizes a more comprehensive and accurate monitoring basis for the connector contact state by constructing a dual-band resonant network and optimizing its connection method, and provides more reliable data support for subsequent abnormality detection and adaptive repair.

[0018] Regarding the solution of claim 3 in the claims, the programmable waveform generator (IC1), as the core device for generating the swept-frequency signal, can generate an accurate swept-frequency signal covering a preset frequency range (e.g., 1 MHz to 10 MHz), and can receive control instructions from the impedance analysis unit through the SPI interface to achieve flexible configuration of swept-frequency parameters, such as frequency range, scanning step size, etc., ensuring the accuracy and controllability of the swept-frequency signal and laying a foundation for obtaining high-quality impedance spectrum data. The gain and phase detector (IC2) is configured as the core device for collecting response signals. It can synchronously compare the swept-frequency signal with the response signal from the resonant network module, accurately measure the amplitude difference and phase difference between the two, and convert these differences into analog voltage signals (VMAG, VPHS) for output, thus effectively extracting the response characteristics of the resonant network at different frequencies and providing key analog signal data for subsequent impedance analysis. The high-speed analog-to-digital converter (IC3) serves as the key bridge from analog signals to digital signals. Its high-speed sampling ability (e.g., 20 MSPS) ensures that it can capture the details of the rapidly changing response signals and convert them into digital signals (D0 - D11) for transmission to the impedance analysis unit for digital signal processing, guaranteeing the real-time performance and accuracy of signal acquisition. The addition of the crystal oscillator (X1) and the voltage regulator (U1) provides stable and reliable clock signals and power supplies for each active device in the signal generation and acquisition unit, ensuring the stable operation and high performance of the entire unit. In summary, the above technical solution constructs an efficient and accurate signal generation and acquisition system by integrating and applying a programmable waveform generator, a gain and phase detector, and a high-speed analog-to-digital converter, supplemented by stable clocks and power supplies, ensuring the generation of high-quality swept-frequency signals and the accurate acquisition of the response signals of the resonant network, providing reliable hardware support for subsequent impedance analysis and anomaly detection.

[0019] Regarding the solution of claim 4 in the claims, the field programmable gate array (FPGA) (IC5) serves as the core processing platform of the impedance analysis unit. Its parallel processing ability and programmable characteristics enable it to efficiently execute complex digital signal processing algorithms, such as the fast Fourier transform (FFT), etc., and quickly and accurately extract impedance spectrum features from the collected response signals, such as key parameters like the frequency, amplitude, and Q value of the resonance peak. Through the SPI interface, the FPGA (IC5) can communicate bidirectionally with the signal generation and acquisition unit, receive digital signals from the high-speed analog-to-digital converter (IC3), and at the same time control the frequency sweep parameters of the programmable waveform generator (IC1), realizing the closed-loop control and optimization of the entire monitoring process. The memory (IC6), such as SDRAM, is electrically connected to the FPGA (IC5) and is used to store historical impedance spectrum data and reference templates. The FPGA (IC5) can compare the currently collected and analyzed impedance spectrum features with the reference templates stored in the memory (IC6), thereby judging the change trend and abnormal degree of the connector contact state. The storage of historical data also provides a data basis for subsequent data analysis, trend prediction, and optimization of the adaptive repair strategy. The voltage regulator (IC7) and the crystal oscillator (Y1) provide stable and reliable power supply and clock signals for the FPGA (IC5), ensuring the efficient and stable operation of the FPGA (IC5) and ensuring that the impedance analysis unit can work continuously and accurately. In summary, the above technical solution constructs a powerful impedance analysis unit with the FPGA as the core. Through its efficient digital signal processing ability and the cooperation of the memory, it realizes the rapid extraction, comparison and analysis, and trend prediction of the impedance spectrum features of the connector, providing accurate and reliable impedance feature data for the anomaly detection unit and being the core module for realizing the active monitoring function.

[0020] Regarding the solution of claim 5 in the claims, the digital signal processor (DSP) (IC8) serves as the core control and arithmetic device of the anomaly detection unit. It receives the impedance spectrum feature data extracted from the impedance analysis unit FPGA (IC5) and runs a preset anomaly detection algorithm. For example, it compares the current resonance peak parameters with the preset reference threshold to determine whether there is a resonance peak shift or change, thereby accurately detecting anomalies in the connector contact state. Compared with general microcontrollers, the DSP (IC8) has stronger arithmetic capabilities and faster processing speeds in digital signal processing, enabling real-time and efficient complex anomaly detection calculations, ensuring the real-time and accuracy of anomaly detection. The electrically erasable programmable read-only memory (EEPROM) (IC9) is electrically connected to the DSP (IC8) and is used to store the threshold parameters and historical records of anomaly detection. The configurability of the threshold parameters allows the system to flexibly adjust the sensitivity of anomaly detection according to the actual application environment and connector type. The storage of historical records facilitates subsequent data analysis and fault tracing, and also provides a basis for the system to adaptively adjust the detection strategy. The interface isolator (IC10) is set between the DSP (IC8) and the control logic unit to achieve electrical isolation, enhancing the anti-interference ability and safety of the system, preventing the signals of the anomaly detection unit from interfering with the normal operation of the control logic unit, and at the same time protecting the DSP (IC8) from interference or damage by external circuits. In summary, the above technical solution constructs an anomaly detection unit with the DSP as the core, combines the EEPROM for parameter storage and the interface isolator for signal isolation, realizes the intelligent analysis of impedance spectrum features and the accurate detection of abnormal states, and ensures the reliability and safety of the anomaly detection process, providing accurate anomaly signals for the subsequent decision-making of the control logic unit.

[0021] Regarding the solution of claim 6 in the claims, the microcontroller (IC11), as the core decision-making device of the control logic unit, receives the abnormal signal output from the abnormal detection unit interface isolator (IC10), and generates corresponding control instructions according to the preset control logic and repair strategy to coordinate and control the operation of the repair actuator (such as the redundant contact switching circuit and the piezoelectric ceramic vibrator drive circuit) and the display screen interface module. The microcontroller (IC11) is the control center of the entire self-locking connector system, responsible for making intelligent decisions based on the monitoring results and driving the actuator for adaptive repair to achieve the automatic maintenance of the connector. The timer (IC12), such as a watchdog timer, is electrically connected to the microcontroller (IC11) and is used to monitor the operating state of the microcontroller (IC11). When the microcontroller (IC11) runs abnormally due to program errors or other reasons, the watchdog timer can detect it in time and send a reset signal to restart the microcontroller (IC11), preventing the system from crashing and ensuring the stability and reliability of the control system. The optocoupler (IC13) is arranged between the microcontroller (IC11) and the repair actuator and the display screen interface module to achieve electrical isolation, enhancing the anti-interference ability and safety of the system. The optocoupler (IC13) can reliably transmit the control signal sent by the microcontroller (IC11) to the repair actuator and the display screen interface module, while isolating the electrical connections between different modules to prevent mutual interference and improving the stability and reliability of the entire system. In summary, the above technical solution constructs a control logic unit with the microcontroller as the core, combines the watchdog timer for operation monitoring and the optocoupler for signal isolation, realizes the intelligent decision-making for abnormal signals and the reliable control of the repair actuator, and ensures that the self-locking connector system can perform active monitoring and adaptive repair safely, stably and reliably.

[0022] Regarding the solution of claim 7 in the claims, the D flip-flop (IC16) is configured as the latching device of the switching solution. Its input terminal receives the switching solution control signal from the control logic unit microcontroller (IC11), and latches the switching solution state under the trigger of the clock signal, outputting a stable control signal, which ensures the accuracy and stability of the switching operation. The relay driver (IC15), such as ULN2003A, as a power driving device, receives the control signal output by the D flip-flop (IC16) and provides sufficient driving current to drive the coil of the multi-pole double-throw relay (IC14), causing the contact state thereof to switch. The multi-pole double-throw relay (IC14) is the core execution device of the redundant contact switching circuit. Its normally closed contact (NC) is connected to the main signal contact of the display interface module, and its normally open contact (NO) is connected to the spare signal contact. When the relay driver (IC15) drives the relay coil to act, the contact of the multi-pole double-throw relay (IC14) switches from the normally closed position to the normally open position, thereby switching the display signal path from the main signal contact to the spare signal contact, realizing the redundant contact switching function, effectively coping with the situation of poor contact caused by oxidation and corrosion of the main contact, and ensuring the continuity and reliability of signal transmission. The protection diodes (D1-D3) are connected in parallel across the two ends of the relay (IC14) coil to provide reverse electromotive force protection, preventing the reverse high voltage generated when the relay coil is powered off from damaging the relay driver (IC15) or other circuit components, and improving the stability and reliability of the circuit. In summary, the above technical solution constructs a reliable redundant contact switching circuit through the collaborative work of the D flip-flop, the relay driver and the multi-pole double-throw relay, which can respond to the instructions of the control logic unit, quickly and stably switch the display signal to the spare contact, effectively ensuring that the display connector can still work normally in the case of the failure of the main contact, and significantly improving the reliability and service life of the connector.

[0023] Regarding the solution of claim 8 in the claims, the programmable oscillator (IC17) is configured as a generator of a driving signal, which, under the enabling control of the control logic unit optocoupler (IC13), generates a driving signal with a specific frequency (such as 42 kHz), and this frequency is designed to be near the resonant frequency of the piezoelectric ceramic vibrator (PZ1), ensuring that the vibrator can work efficiently. The power amplifier (IC18) receives the driving signal generated by the programmable oscillator (IC17), amplifies its power, and provides sufficient driving ability to drive the subsequent MOSFET (Q4) and step-up transformer (T1). The enabling terminal of the power amplifier (IC18) is also controlled by the control logic unit optocoupler (IC13), realizing the overall enabling and shutdown control of the vibrator driving circuit. The MOSFET (Q4) serves as a switching device, and its gate is driven by the signal amplified by the power amplifier (IC18) to control the on and off of the primary coil of the step-up transformer (T1), forming a pulsed current. The step-up transformer (T1) boosts the low-voltage pulsed current generated by the MOSFET (Q4) to a high-voltage pulse, and its secondary coil is connected to the piezoelectric ceramic vibrator (PZ1). The piezoelectric ceramic vibrator (PZ1) generates a mechanical vibration with a small amplitude under the drive of the high-voltage pulse generated by the step-up transformer (T1), and transfers this vibration to the contact point of the display interface module or the area nearby. This mechanical vibration can effectively break the oxide film on the contact surface, reduce the contact resistance, improve the contact state of the connector, and realize the self-repair function of the contact surface. In summary, the above technical solution constructs an efficient piezoelectric ceramic vibrator driving circuit through the collaborative work of the programmable oscillator, power amplifier, MOSFET, and step-up transformer, which can precisely control the piezoelectric ceramic vibrator to generate mechanical vibration, effectively remove the oxide film on the connector contact surface, realize the self-repair of the contact surface, and further improve the reliability and lifespan of the connector.

[0024] Regarding the solution of claim 9 in the claims, the connector (CN1), such as JAE FI-RE51S-HF, as the standard interface for connecting the display screen, provides an interface for physical and electrical connection with the display screen, including main signal contacts, spare signal contacts, and test points (PIN2, PIN3) connected to the resonant network module, realizing the integration of the connection function and the monitoring and repair function. Integrating the test points on the connector (CN1) enables the resonant network module to be conveniently accessed, simplifies the system design, and improves the integration level. The electrostatic discharge protection circuit (IC19), such as an ESD protection array, is electrically connected to the main signal contacts of the connector (CN1), effectively preventing damage to the internal circuit caused by electrostatic discharge, and improving the anti-static ability and reliability of the connector. The signal buffer (IC20), such as a bus transceiver, is electrically connected between the main signal contacts and spare signal contacts of the connector (CN1) and the external circuit, enhancing the signal driving ability and anti-interference ability, and ensuring the integrity and reliability of signal transmission. The control terminal of the signal buffer (IC20) is electrically connected to the optocoupler (IC13) of the control logic unit, realizing the selection and switching control of the signal path, and providing a hardware basis for redundant contact switching. Ferrite beads (FB1-FB8) and termination resistors (R40-R47) are electrically connected to the control signal contacts of the connector (CN1), used to suppress electromagnetic interference (EMI) and radio frequency interference (RFI), and perform impedance matching, further optimizing the signal quality and improving the reliability and stability of signal transmission. In summary, the above technical solution constructs a robust and high-performance display screen interface module by integrating multiple functions such as the connector body, electrostatic discharge protection, signal buffering, EMI filtering, and impedance matching, not only providing the standard display screen connection function, but also integrating the key interfaces and circuits required for self-monitoring and self-repair, laying a solid hardware foundation for the implementation of the entire self-locking connector system.

[0025] Regarding the solution of claim 10 in the claims, by making a specific matrix connection between the output ports (A9 - A16, B9 - B16) of the signal buffer (IC20) and the spare contacts (NC1 - NC4) of the relay (IC14), for example, connecting the A9 - A12 pins of the signal buffer (IC20) to the NC1 contact of the relay (IC14), and so on, it realizes the grouping of multiple display signals and corresponding them to multiple groups of spare contacts. When the relay (IC14) switches to the spare contacts, the signal buffer (IC20) can seamlessly switch the display signals to the spare signal path, and through the matrix connection, it ensures that multiple signals can be switched to the corresponding spare contacts simultaneously and reliably, avoiding signal confusion or loss, and guaranteeing the integrity and reliability of signal transmission. This specific connection method optimizes the efficiency and reliability of redundant contact switching, enabling the spare contacts to truly play their backup role. When the main contacts fail, they can take over the work in a timely and effective manner, ensuring the continuous and stable operation of the display connector. In summary, the above technical solution, by clarifying the specific matrix connection relationship between the signal buffer and the redundant contact switching circuit, ensures that when redundant contact switching is performed, the display signals can be accurately and reliably switched to the spare signal path, achieving true seamless switching, and further enhancing the redundant backup ability and overall reliability of the self-locking display connector.

[0026] The technical effects that a self-locking display connector of the present invention aims to achieve are as follows: 1. Active monitoring and early warning: Through the collaborative work of the signal generation and acquisition unit, the impedance analysis unit, and the anomaly detection unit, the present invention can monitor the contact state of the connector in real time. The impedance spectrum characteristics can sensitively reflect the change in contact resistance caused by oxidation and corrosion of the contact surface. The shift or change of the resonance peak is used as an anomaly index, which can early warn potential contact problems and prevent problems before they occur. 2. Adaptive repair without manual intervention: According to the detection results of the anomaly detection unit, the control logic unit can automatically decide whether to initiate repair and control the repair actuator to perform corresponding repair operations. This adaptive repair mechanism does not require manual intervention and can effectively improve the contact state in a timely manner and restore the electrical performance of the connector. 3. Dual guarantee to improve reliability: In the solution of the present invention, the repair actuator can be configured with a variety of repair means, such as redundant contact switching and piezoelectric ceramic vibration mentioned in the technical disclosure. Redundant contact switching can immediately switch to the standby contact when the main contact fails, maintaining the signal path unobstructed; piezoelectric ceramic vibration can effectively break the oxide film on the contact surface and restore good conductivity of the contact surface. These two repair means form a dual guarantee, significantly improving the reliability of the connector. 4. Accurate judgment to reduce misjudgment: Anomaly detection based on impedance spectrum characteristics can reflect the contact state more comprehensively and accurately compared to simple voltage or current monitoring. The impedance spectrum contains various information such as frequency, amplitude, and phase, which can more accurately identify different types of contact anomalies, reduce the misjudgment rate, and avoid unnecessary repair operations. 5. Extend the service life and reduce costs: Through active monitoring and adaptive repair, the present invention can effectively inhibit the accumulation of oxidation and corrosion of the contact surface, extend the service life of the connector in harsh environments such as high humidity. Reduce display anomalies and even equipment downtime caused by connector failures, thereby reducing maintenance costs and operating costs. In summary, the technical solution of the present invention realizes a self-locking display connector with high reliability, long service life, and low maintenance cost through innovative designs such as active monitoring, adaptive repair, and dual guarantee, effectively solving the technical problem that connectors in the prior art are prone to failure in high humidity environments, and having significant technical effects and industrial application value. Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0028] Figure 1 is the overall module diagram of the present invention;

[0029] Figure 2 is the circuit diagram of the resonance network module of the present invention;

[0030] Figure 3This is the circuit diagram of the signal generation and acquisition unit module of the present invention;

[0031] Figure 4 This is the circuit diagram of the impedance analysis unit module of the present invention;

[0032] Figure 5 This is the circuit diagram of the anomaly detection unit module of the present invention;

[0033] Figure 6 This is the circuit diagram of the control logic unit module of the present invention

[0034] Figure 7 This is the circuit diagram of the redundant contact switching circuit module of the present invention

[0035] Figure 8 This is the circuit diagram of the piezoelectric ceramic vibrator module of the present invention

[0036] Figure 9 This is the circuit diagram of the display screen interface module of the present invention. Detailed implementation manners

[0037] The preferred implementation manners of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0038] I. Overall technical solution

[0039] Figure 1 The overall module diagram of the self-locking display screen connector according to an embodiment of the present invention is shown. As Figure 1 shown, the self-locking display screen connector of this embodiment includes the following functional modules: a resonant network module, a signal generation and acquisition unit, an impedance analysis unit, an anomaly detection unit, a control logic unit, a repair actuator (including a redundant contact switching circuit and a piezoelectric ceramic vibrator drive circuit), and a display screen interface module.

[0040] In this embodiment, the active monitoring and repair of the oxidation and corrosion of the connector contact surface are realized through multi-band impedance analysis technology, and the use reliability of the connector in a high-humidity environment is improved. The working principle of the self-locking display screen connector is as follows: the signal generation and acquisition unit applies a frequency-sweeping signal to the resonant network module; the impedance analysis unit receives and processes the response signal data from the signal generation and acquisition unit, and extracts impedance characteristics; the anomaly detection unit judges the contact state of the connector based on the impedance characteristics; the control logic unit receives the judgment result and decides whether to start the repair; the repair actuator acts on the contacts of the display screen interface module or the area near them according to the instructions of the control logic unit to perform the repair operation, so as to realize the active monitoring and adaptive repair of the contact state of the connector.

[0041] II. Specific Implementations of Each Functional Module

[0042] 1. Regarding the Resonant Network Module

[0043] Figure 2 The circuit structure of the resonant network module is shown. As Figure 2 shown, the resonant network module adopts a parallel resonant circuit structure, has multi-band resonant characteristics, and includes a first resonant branch and a second resonant branch connected in parallel. The first resonant branch includes a first inductor L1 and a first capacitor C1 connected in series, forming a circuit with a resonant frequency of approximately 1 MHz; the second resonant branch includes a second inductor L2 and a second capacitor C2 connected in series, forming a circuit with a resonant frequency of approximately 10 MHz.

[0044] Specifically, one end of the first inductor L1 is connected to the power supply VCC through a first current-limiting resistor R1, the other end is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to the measurement point A. Similarly, one end of the second inductor L2 is connected to the power supply VCC through a second current-limiting resistor R2, the other end is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is connected to the measurement point B. The measurement points A and B are electrically connected to the gain and phase detector IC2 of the signal generation and acquisition unit.

[0045] In this embodiment, the inductance value of the first inductor L1 is 1 μH, and an inductor component with the model number Murata LQW18AN1R0J00 can be used, with an accuracy of ±5% and a Q value ≥ 50; the capacitance value of the first capacitor C1 is 25.3 nF, and a ceramic capacitor with the model number KEMETC0603C253K5RACTU can be used, with a rated voltage of 50 V; the inductance value of the second inductor L2 is 0.1 μH, and an inductor component with the model number TDK MLF1608A-R10J can be used, with an accuracy of ±5% and a Q value ≥ 40; the capacitance value of the second capacitor C2 is 2.53 nF, and a ceramic capacitor with the model number TDK C1608X7R1H252K can be used, with a rated voltage of 50 V; the resistance values of the first current-limiting resistor R1 and the second current-limiting resistor R2 are both 10 Ω, and a resistor with the model number Vishay CRCW060310R0FKEA can be used, with a power of 0.1 W and an accuracy of ±1%.

[0046] When the resonant network module receives the swept-frequency signal generated by the signal generation and acquisition unit, the first resonant branch generates a first resonant peak near 1 MHz, and the second resonant branch generates a second resonant peak near 10 MHz. When the contact surface state of the connector is good, the frequency and amplitude of the resonant peak remain stable; when the contact surface oxidizes, the contact resistance increases, resulting in a shift in the resonant peak frequency and a decrease in amplitude, and these changes can be detected through the measurement points A and B.

[0047] The technical effect of the design of this resonant network module is as follows: By adopting a parallel dual-resonant branch structure, characteristic resonant peaks are generated at two different frequency bands (1 MHz and 10 MHz), which can more comprehensively reflect the change of the connector contact state, improving the sensitivity and accuracy of monitoring. In particular, the high-frequency resonant peak (10 MHz) is more sensitive to small changes in the contact state, while the low-frequency resonant peak (1 MHz) is more sensitive to macroscopic changes in the contact state. The combination of the two provides more comprehensive contact state information.

[0048] 2. Regarding the signal generation and acquisition unit

[0049] Figure 3 The circuit structure of the signal generation and acquisition unit is shown. As Figure 3 shown, the signal generation and acquisition unit includes a programmable waveform generator IC1, a gain and phase detector IC2, a high-speed analog-to-digital converter IC3, a crystal oscillator X1, and a voltage regulator U1.

[0050] The programmable waveform generator IC1 is configured to generate a swept-frequency signal. A chip with the model number AD9834BRUZ can be used, which has a 10-bit DAC and a clock frequency of up to 75 MHz. IC1 is electrically connected to the impedance analysis unit through an SPI interface to receive control instructions; the output terminal VOUT of IC1 is electrically connected to the input terminal of the resonant network module to provide a swept-frequency excitation signal; the MCLK terminal of IC1 is connected to the crystal oscillator X1 to provide an accurate clock signal.

[0051] The gain and phase detector IC2 is configured to compare the difference between the swept-frequency signal and the resonant response. A chip with the model number AD8302ARUZ can be used, and its operating frequency range is from DC to 2.7 GHz. The first input terminal RF IN A of IC2 is electrically connected to the measurement point A of the resonant network module, its second input terminal RF IN B is electrically connected to the measurement point B of the resonant network module, and its output terminals VMAG and VPHS respectively output the amplitude and phase information of the response signal.

[0052] The high-speed analog-to-digital converter IC3 is configured to convert the analog response signal into a digital signal. A chip with the model number AD9235BRUZ-20 can be used, with a sampling rate of 20 MSPS and a resolution of 12 bits. The input terminals IN A and IN B of IC3 are respectively electrically connected to the output terminals VMAG and VPHS of the gain and phase detector IC2, and its digital output terminals D0 - D11 are electrically connected to the impedance analysis unit and communicate with the impedance analysis unit through an SPI interface at the same time.

[0053] The crystal oscillator X1 can use a crystal oscillator with the model number ABLS-25.000MHZ-B2F-T, with a frequency of 25 MHz and a stability of ±50 ppm, providing a stable clock signal for the programmable waveform generator IC1. The voltage regulator U1 can use a voltage regulator with the model number AMS1117-3.3 to convert the 5V input power supply into a 3.3V stable power supply to provide power for IC1, IC2, and IC3.

[0054] The working process of the signal generation and acquisition unit is as follows: Under the control of the impedance analysis unit, IC1 generates a linear sweep signal from 1 MHz to 10 MHz, with a sweep step of 10 kHz, and each sweep contains 900 frequency points. The sweep signal is compared with the response signal of the resonant network module through IC2. IC2 calculates the gain difference and phase difference between the two signals and outputs the corresponding analog voltage. IC3 converts these analog voltages into 12-bit digital signals and transmits them to the impedance analysis unit for processing. The entire scanning process is completed within 20 ms, ensuring the ability to monitor the connector status in real time.

[0055] The technical effect of the design of this signal generation and acquisition unit is that through high-precision waveform generation and signal acquisition, the accurate measurement of the resonant network response is realized, and small impedance changes can be captured. In particular, the use of a gain and phase detector to measure amplitude and phase information simultaneously provides more comprehensive impedance characteristic data, which is beneficial for subsequent anomaly detection.

[0056] 3. Regarding the impedance analysis unit

[0057] Figure 4 The circuit structure of the impedance analysis unit is shown. As Figure 4 shown, the impedance analysis unit includes a field-programmable gate array IC5, a memory IC6, a voltage regulator IC7, and a crystal oscillator Y1.

[0058] The field-programmable gate array IC5 is configured to process digital signals from the signal generation and acquisition unit, extract impedance spectrum characteristics, and can use an FPGA chip with the model number Xilinx Artix-7 XC7A35T-1CPG236C. The data input terminals IO_L1P_T0 to IO_L12P_T1 of IC5 are electrically connected to the 12-bit data output lines D0 - D11 of the high-speed analog-to-digital converter IC3; the SPI interfaces IO_L13P_T2 to IO_L15P_T2 of IC5 are electrically connected to the SPI interfaces of the programmable waveform generator IC1 and the high-speed analog-to-digital converter IC3; the result output terminal IO_L16P_T2 of IC5 is electrically connected to the anomaly detection unit for transmitting the processing result; the memory interfaces IO_L17P_T2 to IO_L24P_T3 and IO_L1P_T0 to IO_L12P_T1 of IC5 are electrically connected to the address lines and data lines of the memory IC6.

[0059] The memory IC6 is electrically connected to the field programmable gate array IC5 and is configured to store historical data and reference templates. An SDRAM with the model number IS42S16400J-7TL can be used, and its capacity is 64MB. The address lines A[0:12], data lines D[0:15], and control signals (CS, RAS, CAS, WE) of IC6 are respectively connected to the corresponding pins of IC5.

[0060] The voltage regulator IC7 can use a chip with the model number TPS62110RGTT to convert the 5V input into 1.8V to supply power to the FPGA core. The crystal oscillator Y1 can use a crystal oscillator with the model number ECS-2520MV-250-CN-TR, with a frequency of 25MHz, to provide a clock signal for IC5.

[0061] The working process of the impedance analysis unit is as follows: IC5 receives the digitized impedance data from IC3, performs a 1024-point FFT algorithm for processing, and extracts the impedance spectrum characteristics. The algorithms implemented inside the FPGA include: a 1024-point radix-2 FFT transform to process the raw data collected by the ADC; a peak detection algorithm to identify the resonance peaks near 1MHz and 10MHz; extraction of resonance peak parameters, including peak frequency, amplitude, and Q value; comparison with historical data to judge the change trend of resonance characteristics over time. IC6 stores the historical impedance spectrum data and reference templates for IC5 to perform comparison and analysis. By comparing the current impedance spectrum with the initial reference template, IC5 can judge the change in the connector contact state and output the processing result to the anomaly detection unit.

[0062] The technical effect of the designed impedance analysis unit is that through the high-speed digital signal processing implemented by the FPGA, it can analyze the impedance characteristics of the resonant network in real time and accurately extract the resonance peak parameters. Combining with the historical data comparison function of the memory, the system can track and analyze the long-term change trend of the connector contact state, so as to discover potential problems in advance.

[0063] 4. Regarding the anomaly detection unit

[0064] Figure 5 The circuit structure of the anomaly detection unit is shown. As Figure 5 shown, the anomaly detection unit includes a digital signal processor IC8, an electrically erasable programmable read-only memory IC9, and an interface isolator IC10.

[0065] The digital signal processor IC8 is configured to compare the determined impedance spectrum characteristics with a preset reference to detect anomalies. A DSP chip of model TI TMS320F28335 can be used, with a clock frequency of 150 MHz and 32-bit floating-point processing capabilities. The input terminals GPIO0 - GPIO2 of IC8 are electrically connected to the output terminals of the FPGA (IC5) of the impedance analysis unit for receiving the processed resonance peak parameters; GPIO12 - GPIO14 of IC8 are connected to the status indicator LEDs to display the current status; the SPI interface (SPI_MOSI, SPI_MISO) of IC8 is connected to the SDA and SCL pins of IC9; GPIO3 and GPIO4 of IC8 are connected to the IN1 and IN2 pins of the interface isolator IC10 for sending anomaly signals to the control logic unit.

[0066] The electrically erasable programmable read-only memory IC9 is electrically connected to the digital signal processor IC8 and is configured to store threshold parameters and historical records. An EEPROM of model 24LC256 with a capacity of 256 Kb can be used. The SDA and SCL pins of IC9 are connected to the SPI_MOSI and SPI_MISO pins of IC8 for data exchange.

[0067] The interface isolator IC10 is electrically connected to the digital signal processor IC8 and the control logic unit respectively. A 4-channel digital isolator of model ISO7640 can be used. IN1 and IN2 of IC10 are connected to GPIO3 and GPIO4 of IC8, and OUT1 and OUT2 are connected to the input terminals of the control logic unit to provide electrical isolation functions.

[0068] The working process of the anomaly detection unit is as follows: IC8 receives the processed resonance peak parameters from the FPGA (IC5) and determines whether there are anomalies through a dedicated algorithm. The judgment criteria include: the resonance frequency offset exceeds 5%; the resonance peak amplitude drops by more than 3 dB; the Q value decreases by more than 20%; anomalies are detected in three consecutive scans. When the above conditions are met, IC8 sends an anomaly signal to the control logic unit through the isolator IC10, and at the same time indicates the current status through the LEDs: normal (LED1 on), minor anomaly (LED2 on), severe anomaly (LED3 on). IC9 stores the threshold parameters and historical anomaly records to facilitate the system's adaptive adjustment of detection sensitivity and analysis of long-term trends.

[0069] The technical effects of the design of this anomaly detection unit are as follows: precise analysis of impedance spectrum features is achieved through a dedicated DSP processor. Combining with multi-parameter judgment criteria, different types of contact anomalies can be accurately identified. In particular, a mechanism of continuous multiple detections and confirmations is adopted, effectively reducing the false positive rate and improving the reliability of anomaly detection. At the same time, by storing historical data in the EEPROM, adaptive adjustment of the detection threshold is realized, enabling the system to adapt to different environments and usage conditions.

[0070] 5. Regarding the control logic unit

[0071] Figure 6 The circuit structure of the control logic unit is shown. As Figure 6 shown, the control logic unit includes a microcontroller IC11, a timer IC12, an optocoupler IC13, and MOSFET switch transistors Q1 - Q3.

[0072] The microcontroller IC11 is configured to generate control instructions based on the anomaly detection results. A microcontroller of model TIMSP430F5529 can be used, with a clock frequency of 25 MHz and a flash memory capacity of 128 KB. The input terminals P1.0 and P1.1 of IC11 are electrically connected to the output terminals OUT1 and OUT2 of the interface isolator IC10 of the anomaly detection unit; the output terminal P1.2 of IC11 is electrically connected to the A1 pin of the optocoupler IC13 to control the piezoelectric vibrator drive circuit; the output terminal P1.3 of IC11 is electrically connected to the A2 pin of the optocoupler IC13 to control the display interface module; the output terminal P1.4 of IC11 is electrically connected to the gate of MOSFET Q1 to control the redundant contact switching circuit; the output terminals P2.0, P2.1, and P2.2 of IC11 are connected to the enable signals of each execution module; the P2.7 of IC11 is connected to the WDI pin of the timer IC12 to provide a watchdog feeding signal; the RST of IC11 is connected to the WDO pin of IC12 to receive a reset signal.

[0073] The timer IC12 is electrically connected to the microcontroller IC11 and is configured to monitor the operating state of the microcontroller IC11. A watchdog timer of model MAX6369 can be used, with a timeout of 1.6 seconds. The WDI of IC12 is connected to the P2.7 of IC11, the WDO is connected to the RST of IC11, and the SET pin is connected to the 3.3V power supply to set the timeout.

[0074] The optocoupler IC13 is electrically connected to the microcontroller IC11 and the repair actuator (including the piezoelectric ceramic vibrator drive circuit and the display interface module) respectively. A 4-channel optocoupler of model TLP290-4 can be used. A1 of IC13 is connected to P1.2 of IC11, K1 is connected to the 3.3V power supply, C1 is connected to the control line of the piezoelectric vibrator drive circuit, and E1 is connected to the ground; A2 of IC13 is connected to P1.3 of IC11, K2 is connected to the 3.3V power supply, C2 is connected to the control line of the display interface module, and E2 is connected to the ground.

[0075] The MOSFET switching transistors Q1-Q3 can be N-channel MOSFETs of model BSS138, with a voltage tolerance of Vds = 50V and a current capacity of Id = 200mA. The gate of Q1 is connected to P1.4 of IC11, the drain is connected to the control input of the redundant contact switching circuit, and the source is connected to the ground.

[0076] The working process of the control logic unit is as follows: IC11 receives the judgment result from the anomaly detection unit and decides which repair mechanisms to activate according to the degree and duration of the anomaly. The decision logic is as follows: (1) When a minor anomaly signal (frequency offset 5%-10%) is received, wait for 3 seconds to observe if it recovers; (2) If the anomaly persists for more than 3 seconds, activate the redundant contact switching circuit; (3) After switching, wait for 5 seconds. If the anomaly still exists, activate the piezoelectric ceramic vibrator drive circuit; (4) Stop after vibrating for 1 second and wait for 2 seconds to observe the effect; (5) If the anomaly still exists, record the permanent fault and send a warning signal. The timer IC12 ensures the stable operation of IC11 and prevents the system from crashing. The optocoupler IC13 provides electrical isolation to ensure the safe and effective transmission of control signals to the execution module.

[0077] The technical effect of the design of this control logic unit is as follows: Through the microcontroller, intelligent decision-making control is realized. According to the different degrees and durations of anomalies, a progressive repair strategy is adopted, avoiding unnecessary repair operations, and improving the efficiency and reliability of the system. At the same time, by using a watchdog timer and an optocoupler isolator, the anti-interference ability and stability of the system in a harsh environment are improved.

[0078] 6. Regarding the redundant contact switching circuit

[0079] Figure 7 The circuit structure of the redundant contact switching circuit is shown. As Figure 7 shown, the redundant contact switching circuit includes a D flip-flop IC16, a relay driver IC15, a multi-pole double-throw relay IC14, and protection diodes D1-D3.

[0080] The input terminals of the D flip-flop IC16 are electrically connected to the output terminals of the microcontroller IC11 of the control logic unit. A 6-channel D flip-flop of model SN74HC174 can be used. D0, D1, and D2 of IC16 are connected to P2.0, P2.1, and P2.2 of IC11; CLK of IC16 is connected to P1.4 of IC11 as the trigger signal; MR (reset) of IC16 is connected to the 3.3V power supply to keep it at a high level; the Q0, Q1, and Q2 outputs of IC16 are connected to IN1, IN2, and IN3 of IC15.

[0081] The input terminals of the relay driver IC15 are electrically connected to the output terminals of the D flip-flop IC16. A 7-channel Darlington transistor array of model ULN2003A can be used. COM of IC15 is connected to the 5V power supply; IN1, IN2, and IN3 are connected to the Q0, Q1, and Q2 outputs of IC16; OUT1, OUT2, and OUT3 are connected to COIL1, COIL2, and COIL3 of IC14 through D1, D2, and D3.

[0082] The control terminals of the multi-pole double-throw relay IC14 are electrically connected to the output terminals of the relay driver IC15. A 4-way DPDT relay of model TE V23105A5003A201 with a rated current of 1A can be used. COIL1, COIL2, and COIL3 of IC14 are connected to the anodes of D1, D2, and D3; COM is connected to the 5V power supply; IN1-IN4 are connected to the main signal lines of the display interface module; NC1-NC4 are connected to the spare contacts.

[0083] The protection diodes D1-D3 can use diodes of model 1N4148W-7-F. The anodes are connected to OUT1, OUT2, and OUT3 of IC15, and the cathodes are connected to the 5V power supply to provide reverse protection.

[0084] The working process of the redundant contact switching circuit is as follows: When the control logic unit detects an abnormality in the connector, it sets the switching scheme through P2.0 - P2.2 of IC11, and then sends a pulse through P1.4 to trigger IC16 to latch the data. IC16 outputs a stable signal to IC15 to drive the relay coil of IC14. The relay switches to switch the display signal from the main contact to the spare contact. D1-D3 provide back electromotive force protection to prevent the high voltage generated when the relay coil is powered off from damaging the drive circuit. The switching process is completed within 5ms to ensure the continuity of the display signal.

[0085] The technical effect of this redundant contact switching circuit design is as follows: The relay is used to achieve fast and reliable signal path switching. When the main contact has contact problems, the system can automatically switch to the backup contact to ensure the continuity of signal transmission. In particular, the D flip-flop latch switching scheme is adopted, combined with protection diodes, which improves the stability and reliability of the switching process and effectively avoids transient interference and back EMF damage.

[0086] 7. Regarding the driving circuit of the piezoelectric ceramic vibrator

[0087] Figure 8 The circuit structure of the piezoelectric ceramic vibrator driving circuit is shown. As Figure 8 shown, the piezoelectric ceramic vibrator driving circuit includes a programmable oscillator IC17, a power amplifier IC18, a MOSFET Q4, a boost transformer T1, and a piezoelectric ceramic vibrator PZ1.

[0088] The enable terminal of the programmable oscillator IC17 is electrically connected to the output terminal of the optocoupler IC13 of the control logic unit, configured to generate a driving signal. A programmable oscillator of model LTC6908-1 can be used, with a frequency range of 1 kHz - 10 MHz. The VCC of IC17 is connected to the 3.3V power supply; GND is connected to the ground; EN is connected to the C1 output of IC13 to enable the oscillator; SET is connected to the voltage dividing resistor R30 to set a 42 kHz frequency; OUT is connected to the IN+ input of IC18.

[0089] The input terminal of the power amplifier IC18 is electrically connected to the output terminal of the programmable oscillator IC17, and the enable terminal is electrically connected to the output terminal of the optocoupler IC13 of the control logic unit. A power amplifier of model TPA2013D1 can be used, with a power of 2.7W. The VDD of IC18 is connected to the 5V power supply; GND is connected to the ground; IN+ is connected to the OUT output of IC17; IN- is connected to the voltage dividing resistor R31 to provide a bias voltage; SD (shutdown) is connected to the C1 output of IC13; OUT+ is connected to the gate of Q4; OUT- is connected to the ground.

[0090] The gate of the MOSFET Q4 is electrically connected to the output terminal of the power amplifier IC18. A MOSFET of model IRLML6344 can be used, with Vds = 30V and Id = 5A. The gate of Q4 is connected to the OUT+ of IC18; the drain is connected to the primary coil of the T1 transformer; the source is connected to the ground.

[0091] The primary coil of the step-up transformer T1 is electrically connected to the power supply and the drain of the MOSFET Q4, and the secondary coil is electrically connected to the piezoelectric ceramic vibrator PZ1. A transformer of model TTC-5010 with a turns ratio of 1:10 can be used. The primary coil P of T1 is connected to the drain of Q4, and P' is connected to the 5V power supply; the secondary coils S and S' are connected to both ends of PZ1.

[0092] The piezoelectric ceramic vibrator PZ1 can use a piezoelectric ceramic wafer of model PQYT-0003, and the resonance frequency is 42 kHz. One end of PZ1 is connected to the secondary coil S of the T1 transformer, and the other end is connected to the secondary coil S' of the T1 transformer.

[0093] The working process of the piezoelectric ceramic vibrator drive circuit is as follows: When the control logic unit determines that the vibration repair function needs to be activated, it activates IC17 through the output of IC13 to generate a 42 kHz signal. The signal is amplified by IC18 and then drives the MOSFET Q4. Q4 switches the primary coil of the T1 transformer to generate a high-voltage pulse of about 50V to drive PZ1. PZ1 generates mechanical vibrations with a small amplitude (<10μm), which act on the contact surface of the connector to break the oxide film. The vibration mode adopts a pulse modulation method, lasting for 1 second each time, and the start and end times are precisely controlled by the control logic unit.

[0094] The technical effect of the design of this piezoelectric ceramic vibrator drive circuit is that the small mechanical vibrations generated by the piezoelectric effect can effectively break the oxide film on the contact surface of the connector and restore the good state of electrical contact. In particular, the use of high-frequency vibrations of 42 kHz and precisely controlled vibration amplitudes ensures that the oxide film can be efficiently removed without damaging the connector structure, improving the effectiveness and safety of the repair.

[0095] 8. Regarding the display screen interface module

[0096] Figure 9 The circuit structure of the display screen interface module is shown. As Figure 9 shown, the display screen interface module includes a connector CN1, an electrostatic discharge protection circuit IC19, a signal buffer IC20, ferrite beads FB1 - FB8, and termination resistors R40 - R47.

[0097] The connector CN1 has main signal contacts and spare signal contacts for connecting to the display screen, as well as test points PIN2 and PIN3 connected to the resonant network module. A 51-pin connector of model JAE FI-RE51S-HF can be used. PIN1 of CN1 is VCC connected to the main power supply; PIN2 and PIN3 are connected to measurement points A and B of the resonant network module; PIN4 is GND connected to the ground; PIN5-20 are data lines connected to the input of IC19; PIN21-30 are control lines connected through FB1-FB8 and R40-R47.

[0098] The electrostatic discharge protection circuit IC19 is electrically connected to the main signal contacts of the connector CN1. A 4-channel ESD protection array of model TPD4E05U06 can be used. IO1-IO4 of IC19 are respectively connected to PIN5-8 of CN1, VCC is connected to the 3.3V power supply, and GND is connected to the ground.

[0099] The signal buffer IC20 is electrically connected between the main signal contacts and spare signal contacts of the connector CN1 and the external circuit. The control terminal is electrically connected to the optocoupler IC13 of the control logic unit. A 16-bit bus transceiver of model SN74LVCH16T245 can be used. VCCA and VCCB of IC20 are connected to the 3.3V power supply; GND is connected to the ground; OE (Output Enable) and DIR (Direction) are connected to the C2 output of IC13; A1-A8 are connected to the system data lines; B1-B8 are connected to the data lines of CN1; A9-A16 and B9-B16 are connected to the redundant contact outputs.

[0100] The ferrite beads FB1-FB8 can use beads of model BLM18AG601SN1D with an impedance of 600Ω@100MHz. The termination resistors R40-R47 can use resistors of model RC0603FR-07100RL with a resistance value of 100Ω. FB1-FB8 and R40-R47 are electrically connected to the control signal contacts of the connector CN1 to provide EMI filtering and impedance matching functions.

[0101] The A9-A16 pins and B9-B16 pins of the signal buffer IC20 are respectively electrically connected to the spare contacts NC1-NC4 of the relay IC14 of the redundant contact switching circuit. The specific connection relationship is as follows: the A9-A12 pins of IC20 are connected to the NC1 contact of IC14; the A13-A16 pins of IC20 are connected to the NC2 contact of IC14; the B9-B12 pins of IC20 are connected to the NC3 contact of IC14; the B13-B16 pins of IC20 are connected to the NC4 contact of IC14. When the relay IC14 switches to the spare contact, the signal buffer IC20 can switch the display screen signal to the spare signal path.

[0102] The working process of the display screen interface module is as follows: The connector CN1 provides standard interfaces, including power supply, data, and control signals. IC19 prevents electrostatic damage to the internal circuit and provides 8 kV contact discharge protection. IC20 realizes signal isolation and enhancement to ensure the integrity of data transmission. FB1 - FB8 and R40 - R47 provide EMI / RFI filtering and impedance matching to further improve the signal quality. The measurement points of the resonant network module are integrated on CN1 to achieve real-time impedance monitoring. Through IC20 and IC14, the system can seamlessly switch between the main contact and the spare contact to ensure the continuity of the display signal.

[0103] The technical effect of the design of this display screen interface module lies in: By integrating functions such as test points, ESD protection, signal buffering, and EMI filtering, a highly reliable display screen connection interface is achieved. Especially in combination with the redundant contact design, it can automatically switch to the spare contact when a problem occurs with the main contact, significantly improving the reliability and stability of the system in harsh environments.

[0104] III. System Working Principle and Process

[0105] The working process of the self-locking display screen connector in this embodiment is as follows:

[0106] S1. Initialization stage. After the system is powered on, the control logic unit executes a self-check program. The impedance analysis unit generates an initial sweep signal, collects the reference impedance spectrum of the resonant network module, and stores the reference impedance spectrum in the memory IC6 as a reference template.

[0107] S2. Monitoring stage. The system continuously performs sweep measurements in the frequency range of 1 MHz - 10 MHz. The impedance analysis unit analyzes the impedance spectrum characteristics and extracts the resonant peak parameters. The anomaly detection unit compares the current resonant peak with the reference template to determine whether there is an anomaly.

[0108] S3. Judgment stage. If the resonant peak offset < 5%, the system continues to monitor; if the resonant peak offset is between 5% - 10%, the system marks it as a minor anomaly; if the resonant peak offset > 10%, the system marks it as a serious anomaly. If anomalies are detected continuously for 3 times, the system enters the repair stage.

[0109] S4. Repair stage. First, activate the redundant contact switching circuit to switch the signal to the spare contact. After waiting for 5 seconds, detect again. If the anomaly still exists, activate the piezoelectric ceramic vibrator drive circuit to generate a 42 kHz micro-vibration for 1 second. After the vibration stops, wait for 2 seconds and then perform monitoring again.

[0110] S5. Feedback Phase. If the repair is successful, the system resumes the monitoring state and records the repair event; if the repair fails, the system records the permanent fault and sends a warning signal. The system adaptively adjusts the repair strategy according to the repair history and effect.

[0111] In addition, the collaborative working relationship of each module is as follows:

[0112] (1) Connection between the resonant network module and the signal generation and acquisition unit

[0113] The measurement points A and B of the resonant network module are connected to the RF IN A and RF IN B pins of the gain and phase detector IC2; the VOUT output of the programmable waveform generator IC1 is connected to the input end of the resonant network module. The FPGA controls IC1 to generate a swept-frequency signal through the SPI interface, and the signal is injected through the resonant network module. The resonant network module generates characteristic responses at different frequencies. IC2 collects these responses and converts them into phase and amplitude information. IC3 converts the analog signal into a digital signal and transmits it to the FPGA.

[0114] (2) Connection between the signal generation and acquisition unit and the impedance analysis unit

[0115] The D0 - D11 data output lines of the high-speed analog-to-digital converter IC3 are connected to the IO_L1P_T0 to IO_L12P_T1 pins of the FPGA (IC5); the SPI interface of IC3 is connected to the IO_L13P_T2 and IO_L14P_T2 pins of IC5. The FPGA controls IC1 to generate a swept-frequency signal through the IO_L13P_T2 to IO_L15P_T2 pins. IC3 transmits the measurement data to the FPGA through the D0 - D11 data lines. The FPGA receives the data and stores it in IC6, and executes the FFT algorithm to analyze the data and extract the impedance spectrum characteristics.

[0116] (3) Connection between the impedance analysis unit and the anomaly detection unit

[0117] The IO_L16P_T2 output pin of the FPGA (IC5) is connected to the GPIO0 input pin of the DSP (IC8); the IO_L16P_T3 and IO_L17P_T3 pins of IC5 are respectively connected to the GPIO1 and GPIO2 pins of IC8 to provide clock synchronization and control signals. After analyzing the impedance spectrum characteristics, the FPGA transmits the result to the DSP through the IO_L16P_T2 output pin, and the DSP receives the data and performs resonant peak offset analysis.

[0118] (4) Connection between the anomaly detection unit and the control logic unit

[0119] The GPIO3 and GPIO4 of the DSP (IC8) are connected to the IN1 and IN2 pins of the isolator IC10; the OUT1 and OUT2 of the IC10 are connected to the P1.0 and P1.1 pins of the MSP430 (IC11). When the DSP detects an abnormal resonance peak, it outputs signals through GPIO3 and GPIO4. The signals are transmitted to the P1.0 and P1.1 pins of the MSP430 after being isolated by the IC10. The MSP430 judges the degree of abnormality based on the received signals and decides on subsequent actions.

[0120] (5) Connection between the control logic unit and the redundant contact switching circuit

[0121] The P2.0, P2.1, and P2.2 of the MSP430 (IC11) are connected to the D0, D1, and D2 inputs of the D flip-flop IC16; the P1.4 of the IC11 is connected to the CLK input of the IC16; the Q0, Q1, and Q2 outputs of the IC16 are connected to the IN1, IN2, and IN3 of the ULN2003A (IC15). When the MSP430 judges that the contacts need to be switched, it sets the switching scheme through P2.0 - P2.2, and then sends a pulse through P1.4 to trigger the IC16 to latch the data. The IC16 outputs a stable signal to the IC15 to drive the relay of the IC14 to achieve contact switching.

[0122] (6) Connection between the control logic unit and the piezoelectric ceramic vibrator drive circuit

[0123] The P1.2 of the MSP430 (IC11) is connected to the A1 pin of the optocoupler IC13; the C1 and E1 of the IC13 are respectively connected to the EN pin and GND of the oscillator IC17; the C2 and E2 of the IC13 are respectively connected to the SD pin and GND of the power amplifier IC18. When the MSP430 judges that the piezoelectric vibrator needs to be activated, it outputs a high level through P1.2. After being isolated by the optocoupler IC13, the IC17 and IC18 are activated. The IC17 generates a 42 kHz signal, which is amplified by the IC18 to drive the PZ1 to generate mechanical vibration to remove the oxide film on the contact surface of the connector.

[0124] (7) Connection between the control logic unit and the display interface module

[0125] The P1.3 of the MSP430 (IC11) is connected to the A2 pin of the optocoupler IC13; the C2 pin of the IC13 is connected to the OE and DIR pins of the signal buffer IC20. When the MSP430 needs to control the display screen signal, it outputs a signal through P1.3. After being isolated by the IC13, the signal controls the IC20, and the IC20 adjusts the data flow according to the control signal to ensure the stability of the display screen signal.

[0126] In summary, through systematic design and the integration of a variety of innovative technologies, the present invention effectively solves the reliability problem of the display connector in a high-humidity environment, providing a strong guarantee for the stable operation of electronic devices in harsh environments.

Claims

1. A self-locking display connector, comprising: A display interface module having main signal contacts for connecting to a display and contacts associated with a monitoring and repair circuit; A signal generation and acquisition unit electrically connected to a resonant network module, configured to generate a swept-frequency signal covering a preset frequency range and inject it into the resonant network module, and acquire the response signal of the resonant network module; An impedance analysis unit electrically connected to the signal generation and acquisition unit, configured to process the response signal to determine the impedance spectrum characteristics of the resonant network module within the swept-frequency range; An abnormality detection unit electrically connected to the impedance analysis unit, configured to compare the determined impedance spectrum characteristics with a preset reference to detect whether there is a resonant peak shift or change indicating an abnormal contact state of the connector; A control logic unit electrically connected to the abnormality detection unit, configured to generate a control instruction according to the detection result of the abnormality detection unit; A repair actuator electrically connected to the control logic unit and the display interface module, configured to perform at least one repair operation aimed at improving the contact state of the connector in response to the control instruction generated by the control logic unit; Wherein, the signal generation and acquisition unit applies a swept-frequency signal to the resonant network module; the impedance analysis unit receives and processes the response signal data from the signal generation and acquisition unit, and extracts impedance characteristics; The abnormality detection unit judges the contact state of the connector based on the impedance characteristics; the control logic unit receives the judgment result and decides whether to initiate repair; the repair actuator acts on the contacts of the display interface module or the nearby area according to the instruction of the control logic unit to perform a repair operation, so as to realize active monitoring and adaptive repair of the contact state of the connector.

2. The self-locking display connector according to claim 1, wherein The resonant network module includes a first resonant branch and a second resonant branch connected in parallel. The first resonant branch includes a first inductor (L1) and a first capacitor (C1) connected in series. The second resonant branch includes a second inductor (L2) and a second capacitor (C2) connected in series. And the resonant network module is connected in parallel to the power supply pins of the display interface module; wherein, one end of the first inductor (L1) is connected to the power supply through a first current-limiting resistor (R1), and the other end is connected to one end of the first capacitor (C1). The other end of the first capacitor (C1) is connected to measurement point A; one end of the second inductor (L2) is connected to the power supply through a second current-limiting resistor (R2), and the other end is connected to one end of the second capacitor (C2). The other end of the second capacitor (C2) is connected to measurement point B; Measurement points A and B are electrically connected to the gain and phase detector (IC2) of the signal generation and acquisition unit.

3. The self-locking display connector according to claim 1, wherein The signal generation and acquisition unit includes: A programmable waveform generator (IC1), configured to generate a swept-frequency signal. The output terminal (VOUT) of the programmable waveform generator (IC1) is electrically connected to the input terminal of the resonant network module and is electrically connected to the impedance analysis unit through an SPI interface; Gain and phase detector (IC2), configured to compare the difference between the swept signal and the resonance response. The input terminal (RF IN A) of the gain and phase detector (IC2) is electrically connected to measurement point A of the resonance network module, and the input terminal (RF IN B) of the gain and phase detector (IC2) is electrically connected to measurement point B of the resonance network module. The output terminals (VMAG, VPHS) of the gain and phase detector (IC2) are used to output the amplitude and phase information of the response signal; High-speed analog-to-digital converter (IC3), configured to convert the analog response signal into a digital signal. The input terminals (IN A, IN B) of the high-speed analog-to-digital converter (IC3) are respectively electrically connected to the output terminals (VMAG, VPHS) of the gain and phase detector (IC2), and the output terminals (D0 - D11) of the high-speed analog-to-digital converter (IC3) are electrically connected to the impedance analysis unit and are electrically connected to the impedance analysis unit through the SPI interface; Crystal oscillator (X1) and voltage regulator (U1), which respectively provide clock signals and power supplies for the programmable waveform generator (IC1), the gain and phase detector (IC2), and the high-speed analog-to-digital converter (IC3).

4. The self-locking display connector according to claim 3, wherein, The impedance analysis unit includes: Field-programmable gate array (IC5), configured to process the digital signal from the signal generation and acquisition unit and extract impedance spectrum features. The input terminal of the field-programmable gate array (IC5) is electrically connected to the output terminal of the high-speed analog-to-digital converter (IC3) and is electrically connected to the programmable waveform generator (IC1) and the high-speed analog-to-digital converter (IC3) through the SPI interface; Memory (IC6), electrically connected to the field-programmable gate array (IC5), configured to store historical data and reference templates; Voltage regulator (IC7) and crystal oscillator (Y1), which respectively provide power supply and clock signal for the field-programmable gate array (IC5).

5. The self-locking display connector according to claim 4, wherein, The anomaly detection unit includes: Digital signal processor (IC8), configured to compare the determined impedance spectrum features with a preset reference to detect anomalies. Its input terminal is electrically connected to the output terminal of the field-programmable gate array (IC5) of the impedance analysis unit; Electrically erasable programmable read-only memory (IC9), electrically connected to the digital signal processor (IC8), configured to store threshold parameters and historical records; Interface isolator (IC10), electrically connected to the digital signal processor (IC8) and electrically connected to the control logic unit respectively.

6. The self-locking display connector according to claim 5, wherein, The control logic unit includes: Microcontroller (IC11), configured to generate control instructions according to the anomaly detection result. The input terminal of the microcontroller (IC11) is electrically connected to the output terminal of the interface isolator (IC10) of the anomaly detection unit, and the output terminal of the microcontroller (IC11) is electrically connected to the repair actuator and the display interface module; Timer (IC12), electrically connected to the microcontroller (IC11) and configured to monitor the operating state of the microcontroller (IC11); The optocoupler (IC13) is electrically connected to the microcontroller (IC11) and electrically connected to the repair actuator and the display interface module respectively.

7. The self-locking display connector according to claim 6, wherein The repair actuator includes a redundant contact switching circuit, and the redundant contact switching circuit includes: A D flip-flop (IC16) whose input terminal is electrically connected to the output terminal of the microcontroller (IC11) of the control logic unit; A relay driver (IC15) whose input terminal is electrically connected to the output terminal of the D flip-flop (IC16); A multi-pole double-throw relay (IC14), the control terminal of the multi-pole double-throw relay (IC14) is electrically connected to the output terminal of the relay driver (IC15), the normally closed contact of the multi-pole double-throw relay (IC14) is connected to the main signal contact of the display interface module, and the normally open contact of the multi-pole double-throw relay (IC14) is connected to the spare signal contact of the display interface module, and reverse protection is carried out through protection diodes (D1 - D3).

8. The self-locking display connector according to claim 7, wherein, The repair actuator includes a piezoelectric ceramic vibrator drive circuit, and the piezoelectric ceramic vibrator drive circuit includes: A programmable oscillator (IC17), the enable terminal of the programmable oscillator (IC17) is electrically connected to the output terminal of the optocoupler (IC13) of the control logic unit, and is configured to generate a drive signal; A power amplifier (IC18), the input terminal of the power amplifier (IC18) is electrically connected to the output terminal of the programmable oscillator (IC17), and the enable terminal of the power amplifier (IC18) is electrically connected to the output terminal of the optocoupler (IC13) of the control logic unit; A MOSFET (Q4), the gate of the MOSFET (Q4) is electrically connected to the output terminal of the power amplifier (IC18); A step-up transformer (T1), the primary coil of the step-up transformer (T1) is electrically connected to the power supply and the drain of the MOSFET (Q4), and the secondary coil of the step-up transformer (T1) is electrically connected to the piezoelectric ceramic vibrator (PZ1) to drive the piezoelectric ceramic vibrator (PZ1) to generate mechanical vibration acting on the contact or the area near the contact of the display interface module.

9. The self-locking display connector according to claim 6, characterized in that, The display interface module includes: A connector (CN1) having main signal contacts and spare signal contacts for connecting to the display, and test points (PIN2, PIN3) connected to the resonant network module; An electrostatic discharge protection circuit (IC19) electrically connected to the main signal contact of the connector (CN1); A signal buffer (IC20) electrically connected between the main signal contact and the spare signal contact of the connector (CN1) and the external circuit, and the control terminal of the signal buffer (IC20) is electrically connected to the optocoupler (IC13) of the control logic unit; Ferrite beads (FB1 - FB8) and termination resistors (R40 - R47) electrically connected to the control signal contacts of the connector (CN1).

10. The self-locking display connector according to claim 9, characterized in that, The output ports (A9 - A16, B9 - B16) of the signal buffer (IC20) are electrically connected to the spare contacts (NC1 - NC4) of the relay (IC14) of the redundant contact switching circuit respectively; Among them, the pins A9 - A12 of the signal buffer (IC20) are connected to the NC1 contact of the relay (IC14), the pins A13 - A16 of the signal buffer (IC20) are connected to the NC2 contact of the relay (IC14), the pins B9 - B12 of the signal buffer (IC20) are connected to the NC3 contact of the relay (IC14), and the pins B13 - B16 of the signal buffer (IC20) are connected to the NC4 contact of the relay (IC14), so that when the relay (IC14) switches to the spare contact, the signal buffer (IC20) can switch the display screen signal to the spare signal path.

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