Flexible screen high-frequency bending test failure screening system and method

Abstract

The application discloses a flexible screen high-frequency bending test failure screening system and method, which utilizes a high-frequency bending machine to test the flexible screen, measures the temperature of the bending area, and determines thermal failure if the surface temperature distribution, temperature rise rate or steady-state temperature exceeds a threshold value; if the temperature detection is qualified, the crack density and thermal stress of the bending area are detected after the temperature field is stabilized, and mechanical failure is determined if the threshold value is exceeded; if the mechanical detection is qualified, the resistance change rate and breakdown voltage of the bending area are detected after the temperature and stress fields are both stabilized, and electrical failure is determined if the threshold value is exceeded, otherwise, the product is qualified. The system comprises a system control module, a mechanical loading module, a temperature detection module, a crack detection module, a thermal stress detection module, an electrical signal detection module and a data processing module, the modules are linked, multi-stage detection is adopted, the reliability of the flexible screen under high-frequency bending conditions can be comprehensively evaluated, and unqualified products can be effectively screened out.

Description

Technical Field

[0001] This invention relates to the field of flexible display testing, specifically to a failure screening system and method for high-frequency bending tests of flexible screens, which is applicable to the accurate identification of failure modes in high-frequency bending scenarios such as foldable screen phones, wearable devices, and flexible sensors. Background Technology

[0002] With the rapid development of flexible display technology, flexible screens have become an important component of electronic products such as smartphones and wearable devices. Flexible screens, with their bendable and foldable characteristics, bring entirely new interaction methods and user experiences to electronic devices. However, flexible screens undergo frequent bending operations during actual use, posing a significant challenge to their reliability and lifespan. Therefore, conducting high-frequency bending tests on flexible screens to evaluate their reliability and durability has become particularly important.

[0003] Currently, various flexible screen reliability testing systems are available on the market. For example, Chinese patent CN208432497U discloses a flexible screen reliability testing system, which includes control equipment, a high-temperature chamber, a bending test machine, and a testing device, capable of performing bending tests on flexible screens under different temperature conditions and measuring relevant parameters. Similarly, Chinese patent CN108760543A provides a flexible screen reliability testing system and method, which can measure the reliability parameters of flexible screens that have undergone different numbers and degrees of bending while operating at different temperatures.

[0004] Regarding the detection of the bending degree of flexible screens, Chinese patent CN106524894A discloses a method and terminal for detecting the bending degree of flexible screens. This method determines the area and deformation of the flexible screen by detecting the change in capacitance and the area of ​​the change region of the capacitive touchscreen, thereby determining the bending degree of the flexible screen. Furthermore, Chinese patent CN113029808B proposes a flexible screen bending detection device and a flexible screen bending system. By detecting the bending stress during the bending process of the flexible screen, it determines whether the flexible screen bends along a predetermined bending trajectory.

[0005] To prevent flexible screens from being damaged due to excessive bending, Chinese patent CN108538203A proposes a method for alarming abnormal bending of flexible screens. This method determines the degree of bending by calculating the current curvature of each pixel of the flexible screen and issues an alarm when abnormal bending is detected and the duration exceeds a threshold.

[0006] However, existing methods for testing the bending performance of flexible screens have the following significant drawbacks:

[0007] First, existing testing equipment has limited functionality, often only able to monitor a specific performance parameter of flexible membranes, making it difficult to achieve comprehensive performance evaluation under multi-physics coupling conditions. For example, some devices can only detect the number of bends and crack formation of flexible membranes, but cannot monitor temperature rise changes and electrical performance fluctuations during the bending process in real time. This single-parameter monitoring method cannot comprehensively and accurately identify the failure modes of flexible membranes, leading to significant discrepancies between test results and actual usage conditions.

[0008] Secondly, existing testing systems lack multi-level failure assessment mechanisms, making it impossible to identify potential failure risks in a timely manner based on changes in different physical parameters. Most testing systems only provide the final result after the test is completed, failing to make dynamic judgments based on real-time changes in parameters such as temperature, stress, and electrical performance during the test. This not only prolongs the testing cycle but may also lead to unnecessary damage to test samples due to over-testing.

[0009] Furthermore, existing methods for processing and analyzing test data are rather rudimentary, lacking in-depth integration and mining of multi-source data. Current data analysis tools typically only provide simple pass / fail results, failing to delve into the root causes of failures and providing targeted guidance for optimizing production processes, thus limiting further advancements in flexible screen manufacturing technology.

[0010] Therefore, there is an urgent need to develop a failure screening method for high-frequency bending tests of flexible screens that can realize multi-physics field coupling testing, has a multi-level failure judgment mechanism, and supports in-depth analysis of multi-source data, so as to comprehensively and accurately evaluate the reliability and durability of flexible screens and provide strong support for the design optimization and quality control of flexible screens. Summary of the Invention

[0011] To address the technical problems of existing flexible membrane bending performance testing methods, such as limited functionality, difficulty in achieving comprehensive performance evaluation under multi-physics coupling conditions, and crude test data processing and analysis methods lacking in-depth fusion and mining of multi-source data, this invention provides a failure screening system and method for high-frequency bending tests of flexible screens to achieve real-time monitoring and accurate analysis of the multi-physics coupling response of flexible membranes under high-frequency bending conditions.

[0012] The technical solution adopted by this invention to solve its technical problem is: providing a method for screening failures in high-frequency bending tests of flexible screens, comprising:

[0013] Step 1: Use a high-frequency bending machine to test the flexible screen. First, test the temperature of the bending area, including surface temperature distribution, temperature rise rate and steady-state temperature. If any of these exceed the threshold, it is determined to be a thermal failure state and the test is terminated. If none of them exceed the safety threshold, a secondary detection is triggered.

[0014] Step 2: After the temperature field stabilizes, the crack density and thermal stress in the bending area are tested. If either exceeds the threshold, it is determined to be a mechanical failure state and the test is terminated; if neither exceeds the safety threshold, the third level of testing is performed.

[0015] Step 3: After the temperature and stress field have stabilized, the electrical signals in the bending area are detected, including the rate of change of resistance and the breakdown voltage. If any one of them exceeds the threshold, it is determined to be an electrical failure state. If the electrical signals are stable and do not exceed the safety threshold, it is determined to be an overall safe state and the product is qualified.

[0016] Preferably, step 1 specifically includes:

[0017] Step 1.1: Pre-treat the flexible film sample to ensure that its surface is clean and undamaged, and firmly install the sample on the fixture of the high-frequency bending machine to simulate the bending conditions of the flexible screen in actual use;

[0018] Step 1.2: After the high-frequency bending machine starts working, use a high-precision temperature sensor to perform real-time temperature testing on the bending area. The test includes surface temperature distribution, temperature rise rate and steady-state temperature.

[0019] Step 1.3: Set temperature-related safety thresholds. If any of the temperature, temperature rise rate, or steady-state temperature at any point in the surface temperature distribution exceeds the corresponding threshold, the flexible film is determined to be in a thermal failure state, and the test is terminated immediately. If none of the temperature parameters exceed the safety threshold, a secondary detection is triggered.

[0020] Preferably, step 2 specifically includes:

[0021] Step 2.1: After completing the temperature test, wait for the temperature field to stabilize;

[0022] Step 2.2: Use a high-speed camera to acquire images of the bending area, count the number of cracks per unit area, and calculate the crack density;

[0023] Step 2.3: Use a stress testing instrument to detect the thermal stress in the bending area;

[0024] Step 2.4: Set safety thresholds for crack density and thermal stress. If the crack density exceeds the critical value or the thermal stress reaches the material yield strength, the flexible membrane is determined to be in a state of mechanical failure, and the test is terminated. If neither the crack density nor the thermal stress exceeds the safety threshold, the third-level test is performed.

[0025] Preferably, step 3 specifically includes:

[0026] Step 3.1: Before performing electrical signal detection, it is necessary to wait again for the temperature field and stress field to be completely stable;

[0027] Step 3.2: Use electrical testing equipment to detect the electrical signals in the bending area, including the rate of change of resistance and the breakdown voltage;

[0028] Step 3.3: Set the safety thresholds for resistance change rate and breakdown voltage. If the resistance change rate exceeds 20% or the breakdown voltage is lower than the rated value, the flexible membrane is determined to be in an electrical failure state.

[0029] Step 3.4: If the electrical signal is stable, that is, the rate of change of resistance and the breakdown voltage do not exceed the safety threshold, the flexible membrane is determined to be in an overall safe state and the product is qualified.

[0030] The present invention also provides a failure screening system for high-frequency bending test of flexible screen, for performing the above-mentioned failure screening method for high-frequency bending test of flexible screen, characterized in that it includes: a system control module and mechanical loading module, temperature detection module, crack detection module, thermal stress detection module, electrical signal detection module and data processing module connected thereto;

[0031] The mechanical loading module is used for bending tests on the flexible screen;

[0032] The temperature detection module is used to test the temperature of the bending area;

[0033] The crack detection module is used to test the crack density in the bending area.

[0034] The thermal stress detection module is used to perform thermal stress testing on the bending area;

[0035] The electrical signal detection module is used to perform electrical signal testing on the bending area;

[0036] The data processing module uses data analysis software to analyze the collected data and output the causes and mechanisms of failure.

[0037] Preferably, the system control module controls the temperature detection module to be normally open and controls the crack detection module, thermal stress detection module, electrical signal detection module and data processing module to be normally closed.

[0038] Preferably, the temperature detection module is integrated on the high-frequency bending machine. During the bending test of the flexible screen, the temperature detection module or thermocouple array performs temperature testing on the bending area, including surface temperature distribution, temperature rise rate, and steady-state temperature, and uploads the data to the data processing module. If any item exceeds the threshold, it is determined to be a thermal failure state, and the test is terminated; if none of them exceed the safety threshold, a secondary detection is triggered, and the system controls the crack detection module and the thermal stress detection module to be turned on.

[0039] After the temperature field stabilizes, the crack detection module and the thermal stress detection module detect the crack density and thermal stress in the bending area, respectively, and upload the data to the data processing module. If either exceeds the threshold, it is determined to be a mechanical failure state and the test is terminated; if neither exceeds the safety threshold, the third level of detection is performed and the system control electrical signal detection module is turned on.

[0040] After the temperature and stress field have stabilized, the electrical signal detection module detects the electrical signals in the bending area, including the rate of change of resistance and the breakdown voltage, and uploads the data to the data processing module. If any one of them exceeds the threshold, it is determined to be an electrical failure state. If the electrical signals are stable and do not exceed the safety threshold, it is determined to be an overall safe state and the product is qualified.

[0041] The present invention also provides a computer storage medium storing a computer program thereon, which, when executed by a processor, implements the aforementioned method for screening failures in a high-frequency bending test of a flexible screen.

[0042] The beneficial effects of this invention are as follows:

[0043] Following the failure chain logic: This detection method follows the failure chain logic of "thermal → mechanical → electrical", which conforms to the progressive damage mode of materials under actual working conditions. For example, flexible screens first experience thermal runaway, then mechanical tearing, and finally internal short circuits. This avoids misjudgments caused by parameter coupling. For example, detecting resistance changes alone cannot distinguish whether it is temperature or stress-driven. This method can accurately identify the failure mode of flexible films, deeply analyze the root cause of failure, provide targeted guidance for optimizing production processes, and improve product quality control.

[0044] Improving data accuracy by providing boundary conditions: When each level of detection parameter fails, the system promptly outputs the current failure state of the product; if the current detection parameter is qualified, it provides boundary conditions for the next level based on the previous step. For example, the temperature field is used to correct stress calculations, and the stress field is used to correct the resistance model, thus improving data accuracy. For instance, in a flexible screen bending test, the first-level detection detects a local temperature rise to 120℃, the second-level detection confirms stress concentration in that area, and the third-level detection can accurately locate the resistance abrupt change point, i.e., the thermal runaway initiation point.

[0045] Conditional triggering mechanism saves testing time: By using a conditional triggering mechanism, invalid detection is avoided. For example, stress or electrical signal detection is unnecessary when the temperature does not exceed the limit, saving more than 30% of testing time. This progressive detection method achieves precise location and quantitative analysis of thermo-mechanical-electrical coupling failure through strict timing logic and conditional triggering. Attached Figure Description

[0046] The present invention will be described by way of example and with reference to the accompanying drawings, wherein:

[0047] Figure 1This is a flowchart of the method in Embodiment 1 of the present invention;

[0048] Figure 2 This is a structural architecture diagram of the system in Embodiment 2 of the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0050] Example 1

[0051] A method for screening failures in high-frequency bending tests of flexible screens, see reference. Figure 1 This includes the following steps:

[0052] Step 1: Use a high-frequency bending machine to test the flexible screen. First, test the temperature of the bending area, including surface temperature distribution, temperature rise rate and steady-state temperature. If any one of them exceeds the threshold, it is determined to be a thermal failure state and the test is terminated; if none of them exceed the safety threshold, a secondary detection is triggered.

[0053] Specifically, step 1 includes the following sub-steps:

[0054] Step 1.1: Pre-treat the flexible film sample to ensure its surface is clean and undamaged, and firmly mount the sample on the fixture of the high-frequency bending machine to simulate the bending conditions of the flexible screen in actual use. During the pre-treatment process, a lint-free cloth dampened with isopropyl alcohol can be used to gently wipe the surface of the flexible film to remove fingerprints, dust and other impurities. Before installation, a microscopic inspection should be performed to confirm that there are no microscopic scratches on the surface.

[0055] Step 1.2: After the high-frequency bending machine starts working, a high-precision temperature sensor is used to perform real-time temperature testing on the bending area. The test includes surface temperature distribution, temperature rise rate, and steady-state temperature. The temperature sensor uses an infrared thermal imager in conjunction with a miniature thermocouple, with a spatial resolution of up to 0.1 mm, a temperature accuracy of ±0.5℃, and a sampling frequency of 10 Hz, ensuring that transient temperature changes can be captured.

[0056] Step 1.3: Set temperature-related safety thresholds. If any temperature, temperature rise rate, or steady-state temperature at any point in the surface temperature distribution exceeds the corresponding threshold, the flexible film is determined to be in a thermal failure state, and the test is immediately terminated. If none of the temperature parameters exceed the safety thresholds, secondary detection is triggered. The temperature safety thresholds are typically set as follows: maximum surface temperature not exceeding 65℃, temperature rise rate not exceeding 5℃ / second, and the difference between steady-state temperature and ambient temperature not exceeding 30℃.

[0057] Step 2: After the temperature field stabilizes, the crack density and thermal stress in the bending area are tested. If either exceeds the threshold, it is determined to be a mechanical failure state and the test is terminated; if neither exceeds the safety threshold, the third level of testing is performed.

[0058] Specifically, step 2 includes the following sub-steps:

[0059] Step 2.1: After completing the temperature test, wait for the temperature field to stabilize. The criterion for determining temperature field stability is: the temperature change at the measurement point does not exceed 1℃ within 5 consecutive minutes. It usually takes 10-15 minutes to reach a stable temperature field.

[0060] Step 2.2: Use a high-speed camera to acquire images of the bending area, count the number of cracks per unit area, and calculate the crack density. The high-speed camera is equipped with a macro lens with a magnification of 50-100x and a resolution of 4K. It can acquire 120 frames per second and automatically identify and count microcracks through image processing algorithms.

[0061] Step 2.3: The thermal stress in the bending area is detected using a stress testing instrument. A photoelastic stress analyzer is used for stress testing, which can monitor the internal stress distribution of the material in real time, with a measurement accuracy of ±0.5 MPa and a sampling frequency of 5 Hz.

[0062] Step 2.4: Set safety thresholds for crack density and thermal stress. If the crack density exceeds the critical value or the thermal stress reaches the material's yield strength, the flexible membrane is considered to be in a state of mechanical failure, and the test is terminated. If neither the crack density nor the thermal stress exceeds the safety threshold, a third-level test is performed. The safety threshold for crack density is typically set to no more than 5 microcracks per square centimeter, and the safety threshold for thermal stress is set to no more than 80% of the material's yield strength.

[0063] Step 3: After the temperature and stress field have stabilized, the electrical signals in the bending area are detected, including the rate of change of resistance and the breakdown voltage. If any one of them exceeds the threshold, it is determined to be an electrical failure state. If the electrical signals are stable and do not exceed the safety threshold, it is determined to be an overall safe state and the product is qualified.

[0064] Specifically, step 3 includes the following sub-steps:

[0065] Step 3.1: Before performing electrical signal detection, it is necessary to wait again for both the temperature and stress fields to be completely stable. The criteria for determining complete stability of the temperature and stress fields are: within 10 consecutive minutes, the temperature change does not exceed 0.5℃, and the stress change does not exceed 0.2MPa. Typically, an additional 15-20 minutes is required to reach a stable state for both fields.

[0066] Step 3.2: Use electrical testing equipment to detect the electrical signals in the bending area, including the rate of change of resistance and the breakdown voltage. The resistance measurement adopts the four-wire method with an accuracy of 0.01Ω. The breakdown voltage test adopts the step-up voltage method with a voltage increment of 0.5V / second, and the maximum test voltage is twice the rated operating voltage of the flexible screen.

[0067] Step 3.3: Set safety thresholds for the resistance change rate and breakdown voltage. If the resistance change rate exceeds 20% or the breakdown voltage is lower than the rated value, the flexible membrane is determined to be in an electrical failure state. The formula for calculating the resistance change rate is: ,in The resistance value after testing. This is the initial resistance value; the safe threshold for breakdown voltage is usually set to be no less than 1.5 times the rated operating voltage of the flexible screen.

[0068] Step 3.4: If the electrical signal is stable, meaning that the rate of change of resistance and the breakdown voltage do not exceed the safety threshold, the flexible membrane is deemed to be in an overall safe state, and the product is qualified. Qualified products must have all test data recorded in the test report, including key parameters such as maximum temperature, steady-state temperature, crack density, maximum thermal stress, rate of change of resistance, and breakdown voltage, and these records must be kept for at least 3 years.

[0069] The underlying logic of the methods described above follows a failure chain of "thermal → mechanical → electrical". Electrical signal detection must be performed after the temperature and stress field have stabilized for the following reasons:

[0070] Temperature effect: Resistivity changes exponentially with increasing temperature. Thermal drift interference needs to be eliminated, among which, This indicates the set reference temperature (which is the base temperature for calculating resistivity changes). This indicates the actual temperature at the time of measurement. The temperature coefficient of resistance indicates the degree to which the resistivity of a material changes with temperature. Indicates reference temperature The resistivity of the material Indicates the current temperature Below, the resistivity of the material;

[0071] Stress effects: Mechanical deformation can alter the electrical conductivity path (e.g., cracks in a metal thin film can cause a surge in resistance), requiring electrical models to be modified based on real-time strain.

[0072] Safety: If electrical signal detection is performed first, high temperature or high stress may cause electric arc or short circuit, damaging the test equipment.

[0073] The advantages and technical effects achieved are as follows: following the failure chain logic of "thermal → mechanical → electrical", which is consistent with the progressive damage mode of materials under actual working conditions (such as the battery separator first thermally runaway, then mechanically tearing, and finally leading to internal short circuit).

[0074] Avoid misjudgments caused by parameter coupling (such as the inability to distinguish whether the change in resistance is dominated by temperature or stress when detected alone).

[0075] Each level of detection provides boundary conditions for the next level (e.g., temperature field is used to correct stress calculations, and stress field is used to correct resistance models), improving data accuracy.

[0076] In a preferred embodiment, the temperature test employs multi-point temperature measurement technology, arranging nine temperature measurement points in the bending area to form a 3×3 grid, monitoring the temperature change at each point in real time to ensure that local hot spots can be captured. Temperature data is collected every 0.1 seconds and continuously recorded for at least 30 minutes to comprehensively evaluate the thermal characteristics of the flexible screen under high-frequency bending conditions.

[0077] In another preferred embodiment, the crack density detection adopts the fluorescent dye penetration method. First, a special fluorescent dye is sprayed onto the surface of the flexible screen, and then ultraviolet light is used to irradiate it, so that the microcracks emit fluorescence under ultraviolet light, which greatly improves the visibility and detection accuracy of microcracks and can detect microcracks that are invisible to the naked eye.

[0078] In another preferred embodiment, the resistance change rate test employs temperature compensation technology. Based on the temperature-resistivity coefficient of the material, the measured resistance value is temperature-corrected to eliminate the influence of temperature changes on the resistance measurement and obtain more accurate resistance change rate data.

[0079] Example 2

[0080] A failure screening system for high-frequency bending tests of flexible screens is provided to perform a failure screening method for high-frequency bending tests of flexible screens. (See also...) Figure 2 The system includes a system control module and connected to it a mechanical loading module, a temperature detection module, a crack detection module, a thermal stress detection module, an electrical signal detection module, and a data processing module.

[0081] The mechanical loading module is used to conduct bending tests on flexible screens, and its design can simulate various bending conditions of flexible screens in actual use. This module is equipped with a high-precision displacement control system, enabling precise control of the bending angle and the number of bends.

[0082] The temperature detection module is used to test the temperature of the bending area. Integrated into the high-frequency bending machine, this module uses an infrared thermal imager in conjunction with a miniature thermocouple array to monitor the temperature of the bending area in real time. This module can measure parameters such as surface temperature distribution, temperature rise rate, and steady-state temperature.

[0083] The crack detection module is used to test the crack density in the bending area. It is equipped with a high-resolution optical system and an automatic image processing algorithm, which can identify micro-cracks and calculate crack density in real time.

[0084] The thermal stress detection module is used to test the thermal stress in the bending area. It uses photoelastic stress analysis technology to monitor the internal stress distribution of the material in real time.

[0085] The electrical signal detection module is used to perform electrical signal tests on the bending area, including the measurement of resistance change rate and breakdown voltage. This module uses a four-wire method to measure resistance and a step-up voltage method to test breakdown voltage.

[0086] The data processing module uses data analysis software to analyze the collected data and output the causes and mechanisms of failure. Equipped with a high-performance computing unit and professional data analysis software, this module can fuse and analyze multi-source data, identify failure modes, and predict lifespan.

[0087] The system control module keeps the temperature detection module normally open and the crack detection module, thermal stress detection module, electrical signal detection module, and data processing module normally closed. This design ensures that the system first performs temperature detection upon startup, and only when the temperature parameters meet the requirements will other detection modules be gradually activated, forming a multi-level detection mechanism.

[0088] During system operation, the temperature detection module is integrated into the high-frequency bending machine. When the flexible screen undergoes a bending test, the temperature detection module or thermocouple array measures the temperature of the bending area, including surface temperature distribution, temperature rise rate, and steady-state temperature, and uploads the data to the data processing module. As described in Example 1, the temperature test employs multi-point temperature measurement technology, arranging multiple temperature measurement points in the bending area to form a grid, and monitoring the temperature change of each point in real time. If any value exceeds a threshold, a thermal failure state is determined, and the test is terminated; if none exceed the safety threshold, a secondary detection is triggered, and the system controls the crack detection module and thermal stress detection module to activate.

[0089] After the temperature field stabilizes, the crack detection module and the thermal stress detection module detect the crack density and thermal stress in the bending area, respectively, and upload the data to the data processing module. The crack detection module uses a high-speed camera to acquire images of the bending area, counts the number of cracks per unit area, calculates the crack density, and can also use fluorescent dye penetration to improve the visibility and detection accuracy of microcracks. The thermal stress detection module uses stress testing instruments, such as strain gauges or X-ray diffractometers; if any one of these exceeds a threshold, it is determined to be a mechanical failure state, and the test is terminated; if neither exceeds the safety threshold, a third-level detection is performed, and the system controls the electrical signal detection module to start.

[0090] After the temperature and stress field have stabilized, the electrical signal detection module detects the electrical signals in the bending area, including the rate of change of resistance and the breakdown voltage, and uploads the data to the data processing module. The rate of change of resistance test uses temperature compensation technology to eliminate the influence of temperature changes on the resistance measurement. If any item exceeds the threshold, it is judged as an electrical failure state; if the electrical signals are stable and do not exceed the safety threshold, it is judged as an overall safe state, and the product is qualified.

[0091] In a preferred embodiment, the system control module adopts a distributed control architecture, with the main controller coordinating the work of each module and the sub-controllers responsible for the specific control of each module, thereby improving the system's response speed and stability. The control module is equipped with a human-machine interface, allowing operators to view test status and data in real time via a touchscreen and adjust test parameters as needed.

[0092] In another preferred embodiment, the data processing module integrates artificial intelligence algorithms, which can analyze historical test data through deep learning methods and establish a failure prediction model. It can not only determine the current state of the test sample, but also predict its lifespan and possible failure modes in actual use.

[0093] Example 3

[0094] A computer storage medium storing a computer program that, when executed by a processor, implements the high-frequency bending test failure screening method for flexible screens as described in Embodiment 1.

[0095] The computer storage medium may be a read-only memory (ROM), random access memory (RAM), flash memory, optical disk, or other storage device. The computer program may be a set of computer-executable instructions that, when loaded and executed by a processor, enable the processor to perform all the steps of the high-frequency bending test failure screening method for flexible screens described in Embodiment 1.

[0096] In a preferred embodiment, the computer storage medium is a solid-state drive with a storage capacity of 256GB. The computer program is designed with a modular structure, including a temperature testing module, a mechanical detection module, and an electrical signal detection module. Each module corresponds to one of the three main steps in Embodiment 1. The modules interact with each other through a data interface to ensure the continuity of the testing process and the complete transmission of data.

[0097] In another preferred embodiment, the computer program also includes a data analysis module, which can perform statistical analysis on data such as temperature, crack density, thermal stress, resistance change rate and breakdown voltage collected during the test, generate a test report, and visualize the test results, so that technicians can intuitively judge the performance status of the flexible screen.

[0098] In another preferred embodiment, the computer program has a remote monitoring function, which can transmit test data to a cloud server in real time via a network, enabling technicians to monitor test progress and results from any location via mobile devices, and to remotely intervene in the test process when necessary.

[0099] Finally, it should be noted that the above descriptions are merely preferred embodiments of this application, and this application is not limited to the above embodiments. It is understood that other improvements and variations directly derived or conceived by those skilled in the art without departing from the spirit and concept of this application should be considered to be included within the protection scope of this application.

Claims

1. A method for screening failures in high-frequency bending tests of flexible screens, characterized in that, include: Step 1: Use a high-frequency bending machine to test the flexible screen. First, test the temperature of the bending area, including surface temperature distribution, temperature rise rate and steady-state temperature. If any of these exceed the threshold, it is determined to be a thermal failure state and the test is terminated. If none of them exceed the safety threshold, a secondary detection is triggered. Step 2: After the temperature field stabilizes, the crack density and thermal stress in the bending area are tested. If either exceeds the threshold, it is determined to be a mechanical failure state and the test is terminated; if neither exceeds the safety threshold, the third level of testing is performed. Step 3: After the temperature and stress field have stabilized, the electrical signals in the bending area are detected, including the rate of change of resistance and the breakdown voltage. If any one of them exceeds the threshold, it is determined to be an electrical failure state. If the electrical signals are stable and do not exceed the safety threshold, it is determined to be an overall safe state and the product is qualified.

2. The method for screening failures in high-frequency bending tests of flexible screens according to claim 1, characterized in that, Step 1 specifically includes: Step 1.1: Pre-treat the flexible film sample to ensure that its surface is clean and undamaged, and firmly install the sample on the fixture of the high-frequency bending machine to simulate the bending conditions of the flexible screen in actual use; Step 1.2: After the high-frequency bending machine starts working, use a high-precision temperature sensor to perform real-time temperature testing on the bending area. The test includes surface temperature distribution, temperature rise rate and steady-state temperature. Step 1.3: Set temperature-related safety thresholds. If any of the temperature, temperature rise rate, or steady-state temperature at any point in the surface temperature distribution exceeds the corresponding threshold, the flexible film is determined to be in a thermal failure state, and the test is terminated immediately. If none of the temperature parameters exceed the safety threshold, a secondary detection is triggered.

3. The method for screening failures in high-frequency bending tests of flexible screens according to claim 2, characterized in that, Step 2 specifically includes: Step 2.1: After completing the temperature test, wait for the temperature field to stabilize; Step 2.2: Use a high-speed camera to acquire images of the bending area, count the number of cracks per unit area, and calculate the crack density; Step 2.3: Use a stress testing instrument to detect the thermal stress in the bending area; Step 2.4: Set safety thresholds for crack density and thermal stress. If the crack density exceeds the critical value or the thermal stress reaches the material yield strength, the flexible membrane is determined to be in a state of mechanical failure, and the test is terminated. If neither the crack density nor the thermal stress exceeds the safety threshold, the third-level test is performed.

4. The method for screening failures in high-frequency bending tests of flexible screens according to claim 3, characterized in that, Step 3 specifically includes: Step 3.1: Before performing electrical signal detection, it is necessary to wait again for the temperature field and stress field to be completely stable; Step 3.2: Use electrical testing equipment to detect the electrical signals in the bending area, including the rate of change of resistance and the breakdown voltage; Step 3.3: Set the safety thresholds for resistance change rate and breakdown voltage. If the resistance change rate exceeds 20% or the breakdown voltage is lower than the rated value, the flexible membrane is determined to be in an electrical failure state. Step 3.4: If the electrical signal is stable, that is, the rate of change of resistance and the breakdown voltage do not exceed the safety threshold, the flexible membrane is determined to be in an overall safe state and the product is qualified.

5. A failure screening system for high-frequency bending tests of flexible screens, used to execute the failure screening method for high-frequency bending tests of flexible screens according to any one of claims 1-4, characterized in that, include: The system control module and its connected mechanical loading module, temperature detection module, crack detection module, thermal stress detection module, electrical signal detection module and data processing module; The mechanical loading module is used for bending tests on the flexible screen; The temperature detection module is used to test the temperature of the bending area; The crack detection module is used to test the crack density in the bending area. The thermal stress detection module is used to perform thermal stress testing on the bending area; The electrical signal detection module is used to perform electrical signal testing on the bending area; The data processing module uses data analysis software to analyze the collected data and output the causes and mechanisms of failure.

6. The high-frequency bending test failure screening system for flexible screens according to claim 5, characterized in that, The system control module controls the temperature detection module to be normally open and controls the crack detection module, thermal stress detection module, electrical signal detection module and data processing module to be normally closed.

7. The high-frequency bending test failure screening system for flexible screens according to claim 6, characterized in that, The temperature detection module is integrated into the high-frequency bending machine. During the bending test of the flexible screen, the temperature detection module or thermocouple array performs temperature tests on the bending area, including surface temperature distribution, temperature rise rate, and steady-state temperature, and uploads the data to the data processing module. If any item exceeds the threshold, it is determined to be a thermal failure state, and the test is terminated; if none of them exceed the safety threshold, a secondary detection is triggered, and the system controls the crack detection module and thermal stress detection module to be turned on. After the temperature field stabilizes, the crack detection module and the thermal stress detection module detect the crack density and thermal stress in the bending area, respectively, and upload the data to the data processing module. If either exceeds the threshold, it is determined to be a mechanical failure state and the test is terminated; if neither exceeds the safety threshold, the third level of detection is performed and the system control electrical signal detection module is turned on. After the temperature and stress field have stabilized, the electrical signal detection module detects the electrical signals in the bending area, including the rate of change of resistance and the breakdown voltage, and uploads the data to the data processing module. If any one of them exceeds the threshold, it is determined to be an electrical failure state. If the electrical signals are stable and do not exceed the safety threshold, it is determined to be an overall safe state and the product is qualified.

8. A computer storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements a method for screening failures in high-frequency bending tests of flexible screens as described in any one of claims 1-4.

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