Reliability testing method and system for flexible FPC cable for display module

Abstract

The present invention discloses a reliability testing method and system for a flexible FPC cable for a display module, and relates to the technical field of FPC cable testing, including: setting a detection data acquisition cycle and a data acquisition interval; determining a data acquisition time point; constructing a standard characteristic curve of the conductive performance of the FPC cable; collecting detection data and collecting conductive performance real-time characteristic data according to the data acquisition time point; establishing a conductive performance real-time characteristic curve of the FPC cable; obtaining a conductive performance requirement value of the FPC cable; judging whether there is a point in the conductive performance real-time characteristic curve of the FPC cable where the conductive performance real-time characteristic is less than the conductive performance requirement value; judging whether the operating stability of the FPC cable meets the standard. The advantages of the present invention are: this scheme can effectively improve the control of the operating stability of the FPC cable, and then effectively ensure the comprehensive control of the conductive performance of the FPC cable, so as to realize the hierarchical detection and management of the FPC cable.

Description

Technical Field

[0001] The present invention relates to the technical field of FPC cable testing, and in particular to a reliability testing method and system for a flexible FPC cable used in a display module. Background Art

[0002] FPC cable is a group of connecting wires that can be bent within a certain degree. It is a key electrical connector between different modules in the display module. The conductive performance of FPC cable is an important indicator to measure the quality of FPC cable. Therefore, after the FPC cable is processed, it is necessary to perform a conductive performance reliability test on the FPC cable to determine whether the FPC cable reliability performance is qualified. However, in the prior art, the conductive performance reliability test of FPC cable is a single performance targeted test, and there is a lack of continuous detection and analysis of the conductive performance of FPC cable under different reliability tests, making it difficult to fully grasp the conductive performance reliability of FPC cable. Summary of the invention

[0003] In order to solve the above technical problems, a reliability testing method and system for flexible FPC cables for display modules are provided. This technical solution solves the problem that in the above-mentioned prior art, the reliability test of the conductive performance of the FPC cable is a single performance targeted test, and there is a lack of continuous detection and analysis of the conductive performance of the FPC cable under different reliability tests, making it difficult to fully grasp the reliability of the conductive performance of the FPC cable.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A reliability testing method for a flexible FPC cable for a display module, comprising:

[0006] Set the detection data collection cycle and data collection interval of FPC cable;

[0007] Based on the data collection interval, determine several data collection time points within the detection data collection cycle;

[0008] Construct the standard characteristic curve of the conductive performance of FPC cable;

[0009] Obtain a detection start signal, and based on the detection start signal as the acquisition zero point, start to perform multiple reliability tests on the FPC cable in a detection data acquisition cycle, and collect the real-time characteristic data of the conductive performance of the FPC cable in the detection data acquisition cycle according to the data acquisition time point;

[0010] The conductive performance real-time characteristic data of the FPC cable is used as the ordinate, and the data collection time point of the conductive performance real-time characteristic data is used as the abscissa, and a conductive performance real-time characteristic curve of the FPC cable is established in the coordinate system;

[0011] Obtain the required value of the conductivity performance of the FPC cable;

[0012] Based on the real-time characteristic curve of the conductivity of the FPC cable, determine whether there is a point in the real-time characteristic curve of the conductivity of the FPC cable where the real-time characteristic of the conductivity is less than the required value of the conductivity. If so, determine that the FPC cable has a reliability defect. If not, determine that the FPC cable has passed the initial inspection.

[0013] A performance stability test is performed on the FPC cables that have passed the initial inspection to determine whether the operating stability of the FPC cables meets the standards. If so, it is determined that there is an operating stability risk for the FPC cables. If not, the FPC cables are qualified.

[0014] Preferably, the construction of the conductive performance standard characteristic curve of the FPC cable specifically includes:

[0015] Obtain historical conductive performance characteristic curves of several standard FPC cables;

[0016] Based on the historical conductive performance characteristic curve of the standard FPC cable, a number of historical conductive performance characteristic data corresponding to each data collection time point are obtained;

[0017] Calculate the difference between the average and median values ​​of several historical conductive performance characteristic data corresponding to the data collection time point, and record it as the data reliability index;

[0018] Determine whether the data reliability index is less than the preset reliability value. If so, take the average value of several historical conductive performance characteristic data corresponding to the data collection time point as the conductive performance standard characteristic data corresponding to the data collection time point. If not, obtain the conductive performance standard characteristic data corresponding to the data collection time point according to the data calibration algorithm.

[0019] The conductive performance standard characteristic data corresponding to the data collection time point is used as the ordinate, and the data collection time point is used as the abscissa, and a conductive performance standard characteristic curve of the FPC cable is established in the coordinate system.

[0020] Preferably, the data calibration algorithm specifically includes:

[0021] S1. Set a data calibration index value A, wherein the value range of the data calibration index value is 0.01≤A≤0.1;

[0022] S2. determining the total number of historical conductive performance characteristic data, searching in the Grubbs table based on the data calibration index value A and the total number of historical conductive performance characteristic data, and obtaining a critical value for determining the historical conductive performance characteristic data;

[0023] S3, constructing a data calibration formula based on the critical value of the historical conductive performance characteristic data;

[0024] S4, eliminating the historical conductive performance characteristic data that meet the data calibration formula from the plurality of historical conductive performance characteristic data corresponding to the data collection time point;

[0025] S5. Calculate the difference between the mean and median of the remaining historical conductivity characteristic data, and record it as a calibration data reliability index;

[0026] S6. Determine whether the data reliability index is less than the preset reliability value. If so, use the average value of the remaining historical conductive performance characteristic data as the conductive performance standard characteristic data corresponding to the data collection time point. If not, narrow the value of the data calibration index value A within the value range of the data calibration index value, and repeat steps S1 to S6.

[0027] Preferably, the data calibration formula is established by using either the Grubbs criterion or the kurtosis test method:

[0028] The data calibration formula established by using the Grubbs criterion is specifically:

[0029]

[0030] In the data calibration formula established using the Grubbs criterion, x i is the i-th historical conductive performance characteristic data corresponding to the data collection time point, is the average value of several historical conductive performance characteristic data corresponding to the data collection time point, s is the standard deviation of several historical conductive performance characteristic data corresponding to the data collection time point, and bpn is the critical value for judging the historical conductive performance characteristic data;

[0031] The data calibration formula established by the kurtosis test method is specifically:

[0032]

[0033] In the data calibration formula established by the kurtosis test method, i is x i Sort numbers from small to large, is the average value of several historical conductive performance characteristic data corresponding to the data collection time point, x l To arrange in ascending order on x i Previous historical operation data.

[0034] Preferably, the performance stability test of the FPC cable that has passed the initial inspection specifically includes:

[0035] Setting a stability detection time interval;

[0036] Based on the stability detection time interval, a number of stability detection time points are obtained during the detection data collection period;

[0037] Acquire the real-time characteristic data of the conductive performance at the stability detection time point and the standard characteristic data of the conductive performance at the stability detection time point from the real-time characteristic curve of the conductive performance of the FPC cable and the standard characteristic curve of the conductive performance of the FPC cable respectively;

[0038] According to the conductivity deviation value calculation logic, the conductivity deviation value at each stability detection time point is calculated;

[0039] Based on the conductivity deviation values ​​at all stability detection time points, the conductivity stability index of the FPC cable is calculated using the stability calculation formula;

[0040] Determine whether the conductivity stability index of the FPC cable is greater than the preset stability value. If so, it is determined that the operation stability of the FPC cable does not meet the standard. If not, it is determined that the operation stability of the FPC cable meets the standard.

[0041] Wherein, the stability calculation formula is:

[0042]

[0043] Where W is the conductivity stability index of the FPC cable, t j is the jth stability detection time point, P j is the conductivity deviation value corresponding to the jth stability detection time point.

[0044] Preferably, the conductivity deviation value calculation logic is specifically as follows:

[0045] Determine whether the real-time characteristic data of the conductive performance at the stability detection time point is greater than the standard characteristic data of the conductive performance at the stability detection time point;

[0046] If so, the conductivity deviation value at the stability detection time point is 0;

[0047] If not, the difference between the standard characteristic data of the conductive performance at the stability detection time point and the real-time characteristic data of the conductive performance at the stability detection time point is calculated to obtain the conductive performance deviation value at the stability detection time point.

[0048] Furthermore, a reliability testing system for a flexible FPC cable for a display module is proposed, which is used to implement the reliability testing method for the flexible FPC cable for a display module as described above, comprising:

[0049] A storage module, the storage module is used to store a historical conductive performance characteristic curve of a standard FPC cable;

[0050] A standard characteristic module, the standard characteristic module is electrically connected to the storage module, and the standard characteristic module is used to construct a standard characteristic curve of the conductive performance of the FPC cable;

[0051] A real-time monitoring module, the real-time monitoring module is used to obtain a detection start signal, based on the detection start signal as the collection zero point, start collecting the real-time characteristic data of the conductive performance of the FPC cable within the detection data collection period according to the data collection time point;

[0052] A performance judgment module, the performance judgment module is electrically connected to the real-time monitoring module, and the performance judgment module is used to judge whether there is a point in the real-time characteristic curve of the conductive performance of the FPC cable where the real-time characteristic of the conductive performance is less than the required value of the conductive performance based on the real-time characteristic curve of the conductive performance of the FPC cable;

[0053] A stability judgment module is electrically connected to the standard feature module and the real-time monitoring module. The stability judgment module is used to perform a performance stability test on the FPC cable that has passed the initial inspection to determine whether the operating stability of the FPC cable meets the standards.

[0054] Optionally, the standard feature module includes:

[0055] A data calibration unit, the data calibration unit is used to construct a data calibration formula and remove historical conductive performance characteristic data that meets the data calibration formula from a plurality of historical conductive performance characteristic data corresponding to a data collection time point;

[0056] A standard data determination unit, the standard data determination unit is used to determine whether the data reliability index is less than a preset reliability value, if so, the average value of a number of historical conductive performance characteristic data corresponding to the data collection time point is used as the conductive performance standard characteristic data corresponding to the data collection time point, if not, the conductive performance standard characteristic data corresponding to the data collection time point is obtained according to the data calibration algorithm;

[0057] The standard curve fitting unit is used to establish a standard characteristic curve of the conductive performance of the FPC cable in the coordinate system by taking the conductive performance standard characteristic data corresponding to the data collection time point as the ordinate and the data collection time point as the abscissa.

[0058] Optionally, the stability judgment module includes:

[0059] A deviation calculation unit, the deviation calculation unit is used to calculate the conductivity deviation value at each stability detection time point according to the conductivity deviation value calculation logic;

[0060] A stability index calculation unit, the stability index calculation unit is used to calculate the conductivity stability index of the FPC cable through a stability calculation formula based on the conductivity deviation values ​​at all stability detection time points;

[0061] The judging unit is used to judge whether the conductivity stability index of the FPC cable is greater than a preset stability value. If so, it is judged that the operation stability of the FPC cable does not meet the standard. If not, it is judged that the operation stability of the FPC cable meets the standard.

[0062] Compared with the prior art, the present invention has the following beneficial effects:

[0063] The present invention proposes a reliability testing scheme for a flexible FPC cable for a display module. By performing multiple reliability tests on the FPC cable in a detection data collection cycle, and performing performance and stability analysis on the collected real-time characteristic curve of the conductive performance of the FPC cable, on the one hand, the FPC cable with conductive performance defects can be effectively detected to prevent defective products from flowing out, and on the other hand, the control of the operating stability of the FPC cable can be effectively improved to prevent the FPC cable with low operating stability from causing the stability of the display module to deteriorate during use, thereby causing greater losses, thereby effectively ensuring a comprehensive control of the conductive performance of the FPC cable, thereby realizing hierarchical management of the FPC cable.

[0064] Compared with the prior art, the present invention has the following beneficial effects:

[0065] The present invention proposes. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 This is a flow chart of the reliability testing method for the flexible FPC cable for the display module proposed by the present invention;

[0067] Figure 2 A flow chart of the method for constructing a standard characteristic curve of the conductive performance of an FPC cable in the present invention;

[0068] Figure 3 A specific method flow chart of the data calibration algorithm in the present invention;

[0069] Figure 4 It is a flow chart of the method for performance stability testing in the present invention;

[0070] Figure 5 A flow chart of a specific method for calculating the conductivity deviation value in the present invention;

[0071] Figure 6 This is a structural block diagram of the reliability testing system for the flexible FPC cable for the display module proposed by the present invention. DETAILED DESCRIPTION

[0072] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0073] Reference Figure 1 As shown, a reliability test method for a flexible FPC cable for a display module includes:

[0074] Set the detection data collection cycle and data collection interval of FPC cable;

[0075] Based on the data collection interval, determine several data collection time points within the detection data collection cycle;

[0076] Construct the standard characteristic curve of the conductive performance of FPC cable;

[0077] Obtain a detection start signal, and based on the detection start signal as the acquisition zero point, start to perform multiple reliability tests on the FPC cable in a detection data acquisition cycle, and collect the real-time characteristic data of the conductive performance of the FPC cable in the detection data acquisition cycle according to the data acquisition time point;

[0078] The conductive performance real-time characteristic data of the FPC cable is used as the ordinate, and the data collection time point of the conductive performance real-time characteristic data is used as the abscissa, and a conductive performance real-time characteristic curve of the FPC cable is established in the coordinate system;

[0079] Obtain the required value of the conductivity performance of the FPC cable;

[0080] Based on the real-time characteristic curve of the conductivity of the FPC cable, determine whether there is a point in the real-time characteristic curve of the conductivity of the FPC cable where the real-time characteristic of the conductivity is less than the required value of the conductivity. If so, determine that the FPC cable has a reliability defect. If not, determine that the FPC cable has passed the initial inspection.

[0081] A performance stability test is performed on the FPC cables that have passed the initial inspection to determine whether the operating stability of the FPC cables meets the standards. If so, it is determined that there is an operating stability risk for the FPC cables. If not, the FPC cables are qualified.

[0082] This solution conducts multiple reliability tests on the FPC cable in succession during the detection data collection cycle, and performs performance and stability analysis on the collected real-time characteristic curve of the conductive performance of the FPC cable. On the one hand, it can effectively detect FPC cables with conductive defects to prevent the outflow of defective products, and on the other hand, it can effectively improve the control of the operating stability of the FPC cable to prevent the FPC cable with low operating stability from causing the stability of the display module to deteriorate during use, thereby causing greater losses.

[0083] Reference Figure 2 As shown in the figure, the standard characteristic curve of the conductive performance of the FPC cable is constructed, which specifically includes:

[0084] Obtain historical conductive performance characteristic curves of several standard FPC cables;

[0085] Based on the historical conductive performance characteristic curve of the standard FPC cable, a number of historical conductive performance characteristic data corresponding to each data collection time point are obtained;

[0086] Calculate the difference between the average and median values ​​of several historical conductive performance characteristic data corresponding to the data collection time point, and record it as the data reliability index;

[0087] Determine whether the data reliability index is less than the preset reliability value. If so, take the average value of several historical conductive performance characteristic data corresponding to the data collection time point as the conductive performance standard characteristic data corresponding to the data collection time point. If not, obtain the conductive performance standard characteristic data corresponding to the data collection time point according to the data calibration algorithm.

[0088] The conductive performance standard characteristic data corresponding to the data collection time point is used as the ordinate, and the data collection time point is used as the abscissa, and a conductive performance standard characteristic curve of the FPC cable is established in the coordinate system.

[0089] Among them, it can be understood that if the difference between the average value and the median value of the historical conductivity performance characteristic data is too large, it means that there are too large or too small values ​​in the historical conductivity performance characteristic data, which causes the average value of the historical conductivity performance characteristic data to be greatly affected. Therefore, the average value of the historical conductivity performance characteristic data at this time is difficult to represent the standard of the historical conductivity performance characteristic data. Therefore, in this scheme, after calibrating the historical conductivity performance characteristic data based on the data calibration algorithm, the conductivity performance standard characteristic data corresponding to the data collection time point is obtained, which can effectively ensure that the conductivity performance standard characteristic data corresponding to each data collection time point can most realistically reflect the conductivity performance standard corresponding to the data collection time point.

[0090] Reference Figure 3 As shown, the data calibration algorithm specifically includes:

[0091] S1. Set a data calibration index value A, the value range of the data calibration index value is 0.01≤A≤0.1;

[0092] S2. determining the total number of historical conductive performance characteristic data, searching in the Grubbs table based on the data calibration index value A and the total number of historical conductive performance characteristic data, and obtaining a critical value for determining the historical conductive performance characteristic data;

[0093] S3, constructing a data calibration formula based on the critical value of the historical conductive performance characteristic data;

[0094] S4, eliminating the historical conductive performance characteristic data that meet the data calibration formula from the plurality of historical conductive performance characteristic data corresponding to the data collection time point;

[0095] S5. Calculate the difference between the mean and median of the remaining historical conductivity characteristic data, and record it as a calibration data reliability index;

[0096] S6. Determine whether the data reliability index is less than the preset reliability value. If so, use the average value of the remaining historical conductive performance characteristic data as the conductive performance standard characteristic data corresponding to the data collection time point. If not, narrow the value of the data calibration index value A within the value range of the data calibration index value, and repeat steps S1 to S6.

[0097] The data calibration formula is established using either the Grubbs criterion or the kurtosis test method:

[0098] Among them, the data calibration formula established using the Grubbs criterion is specifically:

[0099]

[0100] In the data calibration formula established using the Grubbs criterion, x i is the i-th historical conductive performance characteristic data corresponding to the data collection time point, is the average value of several historical conductive performance characteristic data corresponding to the data collection time point, s is the standard deviation of several historical conductive performance characteristic data corresponding to the data collection time point, and bpn is the critical value for judging the historical conductive performance characteristic data;

[0101] The data calibration formula established by the kurtosis test method is as follows:

[0102]

[0103] In the data calibration formula established by the kurtosis test method, i is x i Sort numbers from small to large, is the average value of several historical conductive performance characteristic data corresponding to the data collection time point, x l To arrange in ascending order on x i Previous historical operation data.

[0104] The smaller the data calibration index value is, the stricter the data calibration of the historical conductivity performance characteristic data is, so that more historical conductivity performance characteristic data are eliminated, and the distortion rate of the calculated conductivity performance standard characteristic data is higher. Therefore, this scheme adopts a step-by-step reduction method to determine the data calibration index value, which can maximize the reduction of data distortion rate on the basis of ensuring data reliability, thereby ensuring the accuracy of the conductivity performance standard characteristic data.

[0105] Reference Figure 4 As shown in the figure, the performance stability test of the FPC cable that has passed the initial inspection specifically includes:

[0106] Setting a stability detection time interval;

[0107] Based on the stability detection time interval, a number of stability detection time points are obtained during the detection data collection period;

[0108] Acquire the real-time characteristic data of the conductive performance at the stability detection time point and the standard characteristic data of the conductive performance at the stability detection time point from the real-time characteristic curve of the conductive performance of the FPC cable and the standard characteristic curve of the conductive performance of the FPC cable respectively;

[0109] According to the conductivity deviation value calculation logic, the conductivity deviation value at each stability detection time point is calculated;

[0110] Based on the conductivity deviation values ​​at all stability detection time points, the conductivity stability index of the FPC cable is calculated using the stability calculation formula;

[0111] Determine whether the conductivity stability index of the FPC cable is greater than the preset stability value. If so, it is determined that the operation stability of the FPC cable does not meet the standard. If not, it is determined that the operation stability of the FPC cable meets the standard.

[0112] The stability calculation formula is:

[0113]

[0114] Where W is the conductivity stability index of the FPC cable, t j is the jth stability detection time point, P j is the conductivity deviation value corresponding to the jth stability detection time point.

[0115] Reference Figure 5 As shown, the calculation logic of the conductivity deviation value is as follows:

[0116] Determine whether the real-time characteristic data of the conductive performance at the stability detection time point is greater than the standard characteristic data of the conductive performance at the stability detection time point;

[0117] If so, the conductivity deviation value at the stability detection time point is 0;

[0118] If not, the difference between the standard characteristic data of the conductive performance at the stability detection time point and the real-time characteristic data of the conductive performance at the stability detection time point is calculated to obtain the conductive performance deviation value at the stability detection time point.

[0119] In this solution, by comparing and fitting the real-time characteristic data of the conductive performance and the standard characteristic curve of the conductive performance, the linear change fitting value of the conductive performance deviation value within the detection period is calculated as the conductive performance stability index of the FPC cable. If the conductive performance stability index of the FPC cable is greater than the stable preset value, it means that the conductive performance of the FPC cable has dropped significantly within the detection period. At this time, even if the conductive performance of the FPC cable is still above the conductive performance requirement value, it is still necessary to determine that the FPC cable has an operational stability risk. Through the performance stability test, the comprehensive grasp of the conductive performance of the FPC cable is effectively guaranteed, thereby realizing the hierarchical management of the FPC cable.

[0120] For further information, see Figure 6 As shown, based on the same inventive concept as the reliability testing method for the flexible FPC cable for the display module, the present solution also proposes a reliability testing system for the flexible FPC cable for the display module, comprising:

[0121] A storage module, the storage module is used to store the historical conductive performance characteristic curve of the standard FPC cable;

[0122] A standard feature module, the standard feature module is electrically connected to the storage module, and the standard feature module is used to construct a standard characteristic curve of the conductive performance of the FPC cable;

[0123] A real-time monitoring module is used to obtain a detection start signal, and based on the detection start signal as the acquisition zero point, to start collecting the real-time characteristic data of the conductive performance of the FPC cable within the detection data acquisition cycle according to the data acquisition time point;

[0124] A performance judgment module, the performance judgment module is electrically connected to the real-time monitoring module, and the performance judgment module is used to judge whether there is a point in the real-time characteristic curve of the conductive performance of the FPC cable where the real-time characteristic of the conductive performance is less than the required value of the conductive performance based on the real-time characteristic curve of the conductive performance of the FPC cable;

[0125] The stability judgment module is electrically connected to the standard feature module and the real-time monitoring module. The stability judgment module is used to perform a performance stability test on the FPC cable that has passed the initial inspection to determine whether the operating stability of the FPC cable meets the standards.

[0126] Standard feature modules include:

[0127] A data calibration unit, the data calibration unit is used to construct a data calibration formula and remove the historical conductive performance characteristic data that meets the data calibration formula from a plurality of historical conductive performance characteristic data corresponding to a data collection time point;

[0128] The standard data determination unit is used to determine whether the data reliability index is less than the preset reliability value. If so, the average value of several historical conductive performance characteristic data corresponding to the data collection time point is used as the conductive performance standard characteristic data corresponding to the data collection time point. If not, the conductive performance standard characteristic data corresponding to the data collection time point is obtained according to the data calibration algorithm.

[0129] The standard curve fitting unit is used to establish a standard characteristic curve of the conductive performance of the FPC cable in the coordinate system, using the conductive performance standard characteristic data corresponding to the data collection time point as the ordinate and the data collection time point as the abscissa.

[0130] The stability judgment module includes:

[0131] The deviation calculation unit is used to calculate the conductivity deviation value at each stability detection time point according to the conductivity deviation value calculation logic;

[0132] A stability index calculation unit, which is used to calculate the conductivity stability index of the FPC cable through a stability calculation formula based on the conductivity deviation values ​​at all stability detection time points;

[0133] The judging unit is used to judge whether the conductive performance stability index of the FPC cable is greater than a preset stability value. If so, it is judged that the running stability of the FPC cable does not meet the standard. If not, it is judged that the running stability of the FPC cable meets the standard.

[0134] The use process of the reliability test system for the flexible FPC cable for the above display module is as follows:

[0135] Step 1: The standard feature module retrieves several historical conductive performance characteristic curves of standard FPC cables from the storage module; based on the historical conductive performance characteristic curves of the standard FPC cables, obtains several historical conductive performance characteristic data corresponding to each data collection time point; calculates the difference between the average value and the median value of several historical conductive performance characteristic data corresponding to the data collection time point, and records it as a data reliability index, and uses the standard data determination unit to determine whether the data reliability index is less than the preset reliability value, if so, then the average value of several historical conductive performance characteristic data corresponding to the data collection time point is used as the conductive performance standard characteristic data corresponding to the data collection time point, if not, then through the data calibration unit, the data calibration unit is used to construct a data calibration formula and remove the historical conductive performance characteristic data that meets the data calibration formula from the several historical conductive performance characteristic data corresponding to the data collection time point, and obtain the conductive performance standard characteristic data corresponding to the data collection time point according to the data calibration algorithm, and then through the standard curve fitting unit, the standard curve fitting unit is used to use the conductive performance standard characteristic data corresponding to the data collection time point as the ordinate and the data collection time point as the abscissa, to establish the conductive performance standard characteristic curve of the FPC cable in the coordinate system;

[0136] Step 2: The real-time detection module obtains a detection start signal, and based on the detection start signal as the collection zero point, starts to collect the real-time characteristic data of the conductive performance of the FPC cable within the detection data collection period according to the data collection time point;

[0137] Step 3: The performance judgment module determines whether there is a point in the conductive performance real-time characteristic curve of the FPC cable where the conductive performance real-time characteristic is less than the conductive performance requirement value based on the conductive performance real-time characteristic curve of the FPC cable. If so, it is determined that the FPC cable has a reliability defect. If not, it is determined that the FPC cable has passed the initial inspection.

[0138] Step 4: The stability judgment module sets a stability detection time interval; based on the stability detection time interval, obtains several stability detection time points in the detection data acquisition cycle; obtains the conductivity performance real-time characteristic data and the conductivity performance standard characteristic data at the stability detection time point based on the conductivity performance real-time characteristic curve of the FPC cable and the conductivity performance standard characteristic curve of the FPC cable, respectively, and calculates the conductivity performance deviation value of each stability detection time point according to the conductivity performance deviation value calculation logic through the deviation calculation unit, and then the stability index calculation unit calculates the conductivity performance deviation value based on all stability detection time points, and calculates the conductivity performance stability index of the FPC cable through the stability calculation formula. And the judgment unit determines whether the conductivity performance stability index of the FPC cable is greater than the stability preset value. If so, it is determined that the operation stability of the FPC cable does not meet the standard. If not, it is determined that the operation stability of the FPC cable meets the standard.

[0139] In summary, the advantages of the present invention are: this solution can effectively improve the control of the operating stability of the FPC cable, thereby effectively ensuring the comprehensive control of the conductive performance of the FPC cable, thereby realizing the hierarchical detection management of the FPC cable.

[0140] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A reliability testing method for a flexible FPC cable for a display module, characterized in that: include: Set the detection data collection cycle and data collection interval of FPC cable; Based on the data collection interval, determine several data collection time points within the detection data collection cycle; Construct the standard characteristic curve of the conductive performance of FPC cable; Obtain a detection start signal, and based on the detection start signal as the acquisition zero point, start to perform multiple reliability tests on the FPC cable in a detection data acquisition cycle, and collect the real-time characteristic data of the conductive performance of the FPC cable in the detection data acquisition cycle according to the data acquisition time point; The conductive performance real-time characteristic data of the FPC cable is used as the ordinate, and the data collection time point of the conductive performance real-time characteristic data is used as the abscissa, and a conductive performance real-time characteristic curve of the FPC cable is established in the coordinate system; Obtain the required value of the conductivity performance of the FPC cable; Based on the real-time characteristic curve of the conductivity of the FPC cable, determine whether there is a point in the real-time characteristic curve of the conductivity of the FPC cable where the real-time characteristic of the conductivity is less than the required value of the conductivity. If so, determine that the FPC cable has a reliability defect. If not, determine that the FPC cable has passed the initial inspection. Conduct a performance stability test on the FPC cables that have passed the initial inspection to determine whether the operating stability of the FPC cables meets the standards. If so, the FPC cables are considered to have operating stability risks. If not, the FPC cables are considered qualified. The construction of the conductive performance standard characteristic curve of the FPC cable specifically includes: Obtain historical conductive performance characteristic curves of several standard FPC cables; Based on the historical conductive performance characteristic curve of the standard FPC cable, a number of historical conductive performance characteristic data corresponding to each data collection time point are obtained; Calculate the difference between the average and median values ​​of several historical conductive performance characteristic data corresponding to the data collection time point, and record it as the data reliability index; Determine whether the data reliability index is less than the preset reliability value. If so, take the average value of several historical conductive performance characteristic data corresponding to the data collection time point as the conductive performance standard characteristic data corresponding to the data collection time point. If not, obtain the conductive performance standard characteristic data corresponding to the data collection time point according to the data calibration algorithm. The conductive performance standard characteristic data corresponding to the data collection time point is used as the ordinate, and the data collection time point is used as the abscissa, and the conductive performance standard characteristic curve of the FPC cable is established in the coordinate system; The data calibration algorithm specifically includes: S1. Set a data calibration index value A, wherein the value range of the data calibration index value is 0.01≤A≤0.1; S2. determining the total number of historical conductive performance characteristic data, searching in the Grubbs table based on the data calibration index value A and the total number of historical conductive performance characteristic data, and obtaining a critical value for determining the historical conductive performance characteristic data; S3, constructing a data calibration formula based on the critical value of the historical conductive performance characteristic data; S4, eliminating the historical conductive performance characteristic data that meet the data calibration formula from the plurality of historical conductive performance characteristic data corresponding to the data collection time point; S5. Calculate the difference between the mean and median of the remaining historical conductivity characteristic data, and record it as a calibration data reliability index; S6, judging whether the data reliability index is less than the preset reliability value, if so, taking the average value of the remaining historical conductive performance characteristic data as the conductive performance standard characteristic data corresponding to the data collection time point, if not, narrowing the value of the data calibration index value A within the value range of the data calibration index value, and repeating steps S1 to S6; The performance stability test of the FPC cable that has passed the initial inspection specifically includes: Setting a stability detection time interval; Based on the stability detection time interval, a number of stability detection time points are obtained during the detection data collection period; Acquire the real-time characteristic data of the conductive performance at the stability detection time point and the standard characteristic data of the conductive performance at the stability detection time point from the real-time characteristic curve of the conductive performance of the FPC cable and the standard characteristic curve of the conductive performance of the FPC cable respectively; According to the conductivity deviation value calculation logic, the conductivity deviation value at each stability detection time point is calculated; Based on the conductivity deviation values ​​at all stability detection time points, the conductivity stability index of the FPC cable is calculated using the stability calculation formula; Determine whether the conductivity stability index of the FPC cable is greater than the preset stability value. If so, it is determined that the operation stability of the FPC cable does not meet the standard. If not, it is determined that the operation stability of the FPC cable meets the standard. Wherein, the stability calculation formula is: Where W is the conductivity stability index of the FPC cable, t j is the jth stability detection time point, P j is the conductivity deviation value corresponding to the jth stability detection time point.

2. The reliability testing method for a flexible FPC cable for a display module according to claim 1, characterized in that: The data calibration formula is established by using either the Grubbs criterion or the kurtosis test method: The data calibration formula established by using the Grubbs criterion is specifically: In the data calibration formula established using the Grubbs criterion, x i is the i-th historical conductive performance characteristic data corresponding to the data collection time point, is the average value of several historical conductive performance characteristic data corresponding to the data collection time point, s is the standard deviation of several historical conductive performance characteristic data corresponding to the data collection time point, and bpn is the critical value for judging the historical conductive performance characteristic data; The data calibration formula established by the kurtosis test method is specifically: In the data calibration formula established by the kurtosis test method, i is x i Sort numbers from small to large, is the average value of several historical conductive performance characteristic data corresponding to the data collection time point, x l To arrange in ascending order on x i Previous historical operation data.

3. The reliability testing method for a flexible FPC cable for a display module according to claim 2, characterized in that: The specific calculation logic of the conductivity deviation value is: Determine whether the real-time characteristic data of the conductive performance at the stability detection time point is greater than the standard characteristic data of the conductive performance at the stability detection time point; If so, the conductivity deviation value at the stability detection time point is 0; If not, the difference between the standard characteristic data of the conductive performance at the stability detection time point and the real-time characteristic data of the conductive performance at the stability detection time point is calculated to obtain the conductive performance deviation value at the stability detection time point.

4. A reliability testing system for a flexible FPC cable for a display module, characterized in that: A reliability testing method for a flexible FPC cable for a display module according to any one of claims 1 to 3, comprising: A storage module, the storage module is used to store a historical conductive performance characteristic curve of a standard FPC cable; A standard characteristic module, the standard characteristic module is electrically connected to the storage module, and the standard characteristic module is used to construct a standard characteristic curve of the conductive performance of the FPC cable; A real-time monitoring module, the real-time monitoring module is used to obtain a detection start signal, based on the detection start signal as the collection zero point, start collecting the real-time characteristic data of the conductive performance of the FPC cable within the detection data collection period according to the data collection time point; A performance judgment module, the performance judgment module is electrically connected to the real-time monitoring module, and the performance judgment module is used to judge whether there is a point in the real-time characteristic curve of the conductive performance of the FPC cable where the real-time characteristic of the conductive performance is less than the required value of the conductive performance based on the real-time characteristic curve of the conductive performance of the FPC cable; A stability judgment module is electrically connected to the standard feature module and the real-time monitoring module. The stability judgment module is used to perform a performance stability test on the FPC cable that has passed the initial inspection to determine whether the operating stability of the FPC cable meets the standards.

5. A reliability testing system for a flexible FPC cable for a display module according to claim 4, characterized in that: The standard feature modules include: A data calibration unit, the data calibration unit is used to construct a data calibration formula and remove historical conductive performance characteristic data that meets the data calibration formula from a plurality of historical conductive performance characteristic data corresponding to a data collection time point; A standard data determination unit, the standard data determination unit is used to determine whether the data reliability index is less than a preset reliability value, if so, the average value of a number of historical conductive performance characteristic data corresponding to the data collection time point is used as the conductive performance standard characteristic data corresponding to the data collection time point, if not, the conductive performance standard characteristic data corresponding to the data collection time point is obtained according to the data calibration algorithm; The standard curve fitting unit is used to establish a standard characteristic curve of the conductive performance of the FPC cable in the coordinate system by taking the conductive performance standard characteristic data corresponding to the data collection time point as the ordinate and the data collection time point as the abscissa.

6. The reliability testing system for a flexible FPC cable for a display module according to claim 4, characterized in that: The stability judgment module comprises: A deviation calculation unit, the deviation calculation unit is used to calculate the conductivity deviation value at each stability detection time point according to the conductivity deviation value calculation logic; A stability index calculation unit, the stability index calculation unit is used to calculate the conductivity stability index of the FPC cable through a stability calculation formula based on the conductivity deviation values ​​at all stability detection time points; The judging unit is used to judge whether the conductivity stability index of the FPC cable is greater than a preset stability value. If so, it is judged that the operation stability of the FPC cable does not meet the standard; if not, it is judged that the operation stability of the FPC cable meets the standard.

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