A module picture detection and BTB function detection integrated detection device and method

Abstract

The application discloses a kind of module picture detection and BTB function detection integrated detection device, including needle mould fixture, detection circuit, resistance monitoring module and master control module.Needle mould fixture is equipped with the detection probe corresponding with each pin of BTB connector;Detection circuit is constituted by sampling resistance connected in series into BTB line end, and the whole detection circuit first end is grounded, and tail end is connected to resistance monitoring module;Master control module controls picture detection process according to loop resistance value.The application also discloses corresponding integrated detection method, initially resistance value is judged before picture detection, and picture detection is started after resistance value is normal, and loop resistance value fluctuation is continuously dynamically monitored during each test picture display.The application integrates BTB function detection and module picture detection into single procedure, realizes real-time dynamic monitoring, effectively identifies short circuit, open circuit and half buckling, terminal micro deformation and other dynamic contact bad problems, significantly improves detection efficiency and yield, reduces production cost.

Description

Technical Field

[0001] This invention belongs to the field of display module testing technology, specifically relating to an integrated testing device for functional testing and image testing of board-to-board connectors in display modules. Background Technology

[0002] Board-to-Board (BTB) connectors serve as the core hub for cross-board functional collaboration within electronic devices. They primarily connect the mainboard to various sub-modules or auxiliary boards, such as display and touch components, image and sensing components, power and energy storage components, and acoustic and interactive components. In the manufacturing process of display modules, image inspection and BTB connector functional testing are two core and essential quality control procedures that directly determine the module's yield rate and product reliability.

[0003] In traditional testing processes, the two steps are independent of each other, which has many technical drawbacks: 1. Separation of processes, resulting in low efficiency: Screen inspection requires powering on the module with a lighting machine, and then manually or using equipment to check the screen display effect; BTB function inspection requires a separate continuity test device to test the continuity, short circuit, and contact resistance of the FPC-BTB connector pins, which requires two clamping and two debugging sessions, significantly increasing the inspection time and slowing down the mass production cycle.

[0004] 2. Insufficient testing accuracy and high false negative rate: Standalone BTB testing can only verify pin continuity and cannot be combined with actual lighting conditions. Some dynamic contact problems (such as partial contact or slight terminal deformation) cannot be identified in standalone testing, which easily leads to customer complaints such as intermittent black screen, screen distortion, and touch failure after installation. Existing technologies have solutions for testing the status of each pin of the BTB connector using a voltage comparator test module, but they have not achieved synchronous integration with the screen inspection process.

[0005] 3. Redundant equipment and high cost: Two sets of equipment, namely a lighting machine and a BTB continuity tester, need to be configured separately, which occupies production line space and increases the cost of equipment procurement, maintenance and personnel operation, which does not meet the requirements of lean production. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an integrated testing device and method for module screen inspection and BTB function inspection, so as to realize the simultaneous inspection of the two processes, and to complete the BTB circuit resistance value prediction before power-on, thereby preventing defective products from leaking out and improving the inspection efficiency and yield.

[0007] This invention is implemented as follows: In a first aspect, the present invention provides an integrated testing device for module screen inspection and BTB function inspection, comprising: A needle mold fixture is used to accommodate and position the display module under test. The needle mold fixture is provided with detection probes that make corresponding contact with each pin of the BTB connector of the display module under test. The detection circuit is set inside the needle mold fixture. The detection circuit includes sampling resistors that are connected in series to the relevant terminals of the BTB line. The first end of the entire detection circuit is grounded and the last end is connected to the resistance monitoring module. A resistance monitoring module is installed inside the testing machine and is electrically connected to the detection circuit through the resistance detection interface to obtain the resistance value information of the detection circuit. The main control module is communicatively connected to both the resistance monitoring module and the screen detection module of the test machine, and is used to control the screen detection process based on the resistance value information.

[0008] Furthermore, the resistance monitoring module includes a constant current source unit and a voltage detection unit. The constant current source unit outputs a preset constant current to the detection circuit, and the voltage detection unit collects the voltage value across the detection circuit. The main control module determines whether the circuit resistance is normal based on a comparison of the voltage value with a preset voltage threshold.

[0009] Furthermore, the main control module includes a resistance value determination unit. The resistance value determination unit performs an initial resistance value detection before the display module under test is powered on. When the initial resistance value exceeds the preset standard resistance value range, it determines that the BTB connector has a short circuit or open circuit defect, and the main control module locks the screen output and triggers an alarm.

[0010] Furthermore, the main control module also includes a dynamic monitoring unit, which continuously collects the loop resistance value during the display of each test screen during the screen detection process. When the loop resistance value fluctuation exceeds the preset fluctuation threshold, it is determined that there is a dynamic contact failure, and the main control module locks the current screen and triggers an alarm.

[0011] Furthermore, the preset standard resistance range is set based on the nominal resistance of the sampling resistor and the allowable contact impedance range, and the preset fluctuation threshold is determined based on the nominal resistance of the sampling resistor and the preset fluctuation percentage.

[0012] Furthermore, the main control module also includes an identifier generation unit. When all test screens pass the test and the circuit resistance is normal throughout, the identifier generation unit controls the test machine to overlay and print the "BTB OK" identifier on the last test screen.

[0013] Furthermore, the main control module also includes a data storage unit for storing the loop resistance detection data and screen detection results of each display module under test in real time, forming a traceable detection record.

[0014] Secondly, the present invention provides an integrated detection method for module screen inspection and BTB function inspection, applied to the detection device described in the first aspect, comprising the following steps: Step 1: Assemble the display module to be tested into the pin mold fixture, so that the test probes make corresponding contact with each pin of the BTB connector; Step 2: The resistance monitoring module obtains the initial resistance value of the BTB line through the detection circuit and compares it with the preset standard resistance value range; Step 3: If the initial resistance value exceeds the preset standard resistance value range, it is determined that the BTB connector has a short circuit or open circuit defect. The main control module locks the screen detection process and triggers an alarm. Step 4: If the initial resistance value is within the preset standard resistance value range, the main control module starts the screen detection program and outputs multiple test screens in sequence; Step 5: During the display of each test screen, the resistance monitoring module continuously monitors the circuit resistance value. When the circuit resistance value fluctuates beyond the preset fluctuation threshold, it is determined that there is a dynamic contact failure. The main control module locks the current screen and triggers an alarm. Step 6: When all test screens pass the test and the circuit resistance is normal throughout, the main control module controls the test machine to print the "BTB OK" mark on the last test screen to complete the test.

[0015] Furthermore, in step two, the resistance monitoring module obtains the circuit resistance information by outputting a preset constant current to the detection circuit and collecting the voltage value at both ends of the circuit.

[0016] The advantages of this invention are: 1. Integrated process significantly improves testing efficiency: By merging the two traditional independent inspection processes into a single process, BTB function inspection and module screen inspection can be completed in one clamping, saving the time of repeated clamping and debugging, increasing the mass production inspection cycle by more than 40%, and adapting to the needs of high-speed production lines.

[0017] 2. Real-time monitoring and interception of abnormal changes: High detection accuracy and reduced false negative rate: The needle mold fixture is precisely aligned and combined with high-precision resistance value acquisition, which can identify problems that are easily missed in traditional testing, such as BTB half-cut, terminal micro deformation, and hidden poor contact. During the process, the continuity and short circuit of the BTB circuit can be dynamically monitored and combined with the actual lighting conditions to ensure effective interception of defective products.

[0018] 3. Equipment integration reduces production costs: By integrating the lighting machine with BTB detection functions, the space occupied by a single device is reduced, saving the purchase and maintenance costs of two sets of equipment, while also reducing the number of operators, thus achieving cost reduction and efficiency improvement.

[0019] 4. Data is traceable, facilitating quality control: The main control module stores the test data in real time, and can trace the BTB resistance value and screen test results of each module, which facilitates quality analysis and process optimization and improves the overall production yield. Attached Figure Description

[0020] The present invention will now be further described with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the hardware circuit of the detection device of the present invention; Figure 2 This is an equivalent circuit diagram of the BTB detection loop of the detection device of the present invention; Figure 3 Table showing the correspondence between master / slave BTB pins and sampling resistors; Figure 4 This is a schematic flowchart of the detection method of the present invention. Detailed Implementation

[0022] like Figures 1 to 3 As shown, an integrated testing device for module screen inspection and BTB function inspection includes: A needle mold fixture is used to accommodate and position the display module under test. The needle mold fixture is provided with detection probes that make corresponding contact with each pin of the BTB connector of the display module under test. A detection circuit is set inside the needle mold fixture. The detection circuit includes sampling resistors (with a resistance of 2kΩ) connected in series to the relevant terminals of the BTB line. The first end of the entire detection circuit is grounded and the last end is connected to the resistance monitoring module. A resistance monitoring module is installed inside the testing machine and is electrically connected to the detection circuit through the resistance detection interface to obtain the resistance value information of the detection circuit. The main control module is communicatively connected to both the resistance monitoring module and the screen detection module of the test machine, and is used to control the screen detection process based on the resistance value information.

[0023] The resistance monitoring module includes a constant current source unit and a voltage detection unit. The constant current source unit outputs a preset constant current to the detection circuit, and the voltage detection unit collects the voltage value across the detection circuit. The main control module determines whether the circuit resistance is normal based on a comparison of the voltage value with a preset voltage threshold.

[0024] The main control module includes a resistance value determination unit, which performs an initial resistance value detection before the display module under test is powered on. When the initial resistance value exceeds a preset standard resistance value range, it determines that the BTB connector has a short circuit or open circuit defect, and the main control module locks the screen output and triggers an alarm. It also includes a dynamic monitoring unit, which continuously collects the loop resistance value during the display of each test screen. When the loop resistance value fluctuation exceeds a preset fluctuation threshold, it determines that there is a dynamic contact failure, and the main control module locks the current screen and triggers an alarm. Furthermore, it includes an identification generation unit, which controls the testing machine to overlay and print a "BTB OK" identification mark on the last test screen when all test screens pass the test and the loop resistance value is normal throughout. Finally, it includes a data storage unit, used to store the loop resistance value detection data and screen detection results of each display module under test in real time, forming a traceable test record.

[0025] The preset standard resistance range is set based on the nominal resistance of the sampling resistor and the allowable contact impedance range, and the preset fluctuation threshold is determined based on the nominal resistance of the sampling resistor and the preset fluctuation percentage.

[0026] In the display module pin mold fixture, select the relevant line terminals of the BTB connector and connect a 2kΩ precision resistor in series. The first end of the series line is connected to GND (ground terminal), and the second end is connected to the input terminal of the resistance monitoring module of the test machine.

[0027] Specific testing methods, such as Figure 4 As shown, it includes the following steps: Step 1: Assemble the display module to be tested into the pin mold fixture, so that the test probes make corresponding contact with each pin of the BTB connector; Step 2: The resistance monitoring module obtains the initial resistance value of the BTB line through the detection circuit and compares it with the preset standard resistance value range; the resistance monitoring module obtains the circuit resistance information by outputting a preset constant current to the detection circuit and collecting the voltage value at both ends of the circuit. Step 3: If the initial resistance value exceeds the preset standard resistance value range, it is determined that the BTB connector has a short circuit or open circuit defect. The main control module locks the screen detection process and triggers an alarm. Step 4: If the initial resistance value is within the preset standard resistance value range, the main control module starts the screen detection program and outputs multiple test screens in sequence; Step 5: During the display of each test screen, the resistance monitoring module continuously monitors the circuit resistance value. When the circuit resistance value fluctuates beyond the preset fluctuation threshold, it is determined that there is a dynamic contact failure. The main control module locks the current screen and triggers an alarm. Step 6: When all test screens pass the test and the circuit resistance is normal throughout, the main control module controls the test machine to print the "BTB OK" mark on the last test screen to complete the test.

[0028] The software control logic is as follows: Step S1: After the module is assembled and clamped, the tester first collects the initial resistance value R0 of the BTB circuit through the resistance monitoring module; Step S2: Compare R0 with the preset standard resistance range [Rmin, Rmax]. If R0 exceeds the range, it is determined that the BTB connector has a short circuit or open circuit defect. The tester locks the screen output and issues an audible and visual alarm. Step S3: If R0 is within the standard range, the tester starts the screen detection program and outputs multiple test screens in sequence; Step S4: During each test screen display, the tester continuously monitors the circuit resistance value Rt. If Rt fluctuates beyond the preset range, it is determined that there is a dynamic contact failure (such as half-tightening or slight deformation of the terminal), and the current screen is immediately locked and an alarm is triggered. Step S5: If all test screens pass the test and the resistance values ​​are normal throughout, the tester will overlay a "BTB OK" mark on the last test screen, record the test data, and release the good product.

[0029] Resistance value control threshold setting: The preset standard resistance range is determined based on the nominal resistance value of the series resistor and the allowable contact impedance range. For example... Figure 3 As shown, taking a 2kΩ resistor in series as an example, the total circuit resistance is 8kΩ. The standard resistance range can be set to be ±5%, i.e., 8kΩ ± 5% (i.e., 7.6kΩ to 8.4kΩ). When the detected circuit resistance is lower than 7.6kΩ, a short circuit is determined to exist; when the resistance is higher than 8.4kΩ or is in an open circuit state, an open circuit or poor contact is determined to exist.

[0030] During dynamic testing, the resistance fluctuation threshold can be set to ±10%. If the fluctuation exceeds this range, it is determined that there is a risk of dynamic contact failure.

[0031] The specific operational procedures are as follows: The display module to be tested is assembled into the needle mold fixture, and the BTB connector contacts the test probe of the needle mold fixture; The detection program is started, and the resistance monitoring module performs initial resistance value detection; If the initial resistance value is NG, the system will alarm and lock, and the module will be judged as a defective product. If the initial resistance value is OK, the system executes the screen detection program, switching the test screens sequentially while continuously monitoring the resistance value. If an abnormal resistance value is detected during any screen detection, the system will immediately lock the screen and issue an alarm. If all screens pass the test and the resistance values ​​are normal throughout, the system will print "BTB OK" on the last frame, indicating that the test is complete.

[0032] This invention can be widely applied to the quality inspection process in the display module manufacturing industry. Actual production line verification showed that before the improvement, BTB (Browser Tolerance) inspection and module screen inspection were two separate stations, resulting in high fixture and labor costs, low efficiency, and customer complaints due to missing BTB pin functions. After the improvement, the two stations were successfully reduced to one, saving manpower and resources, significantly increasing production efficiency and yield, and eliminating customer complaints caused by missing BTB functions.

[0033] The above embodiments and figures are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A detection device integrating module screen inspection and BTB function inspection, characterized in that, include: A needle mold fixture is used to accommodate and position the display module under test. The needle mold fixture is provided with detection probes that make corresponding contact with each pin of the BTB connector of the display module under test. The detection circuit is set inside the needle mold fixture. The detection circuit includes sampling resistors that are connected in series to the relevant terminals of the BTB line. The first end of the entire detection circuit is grounded and the last end is connected to the resistance monitoring module. A resistance monitoring module is installed inside the testing machine and is electrically connected to the detection circuit through the resistance detection interface to obtain the resistance value information of the detection circuit. The main control module is communicatively connected to both the resistance monitoring module and the screen detection module of the test machine, and is used to control the screen detection process based on the resistance value information.

2. The integrated detection device for module screen inspection and BTB function inspection as described in claim 1, characterized in that, The resistance monitoring module includes a constant current source unit and a voltage detection unit. The constant current source unit outputs a preset constant current to the detection circuit, and the voltage detection unit collects the voltage value across the detection circuit. The main control module determines whether the circuit resistance is normal based on a comparison of the voltage value with a preset voltage threshold.

3. The integrated detection device for module screen inspection and BTB function inspection as described in claim 1 or 2, characterized in that, The main control module includes a resistance value determination unit. The resistance value determination unit performs an initial resistance value detection before the display module under test is powered on. When the initial resistance value exceeds the preset standard resistance value range, it determines that the BTB connector has a short circuit or open circuit defect. The main control module then locks the screen output and triggers an alarm.

4. The integrated testing device for module screen inspection and BTB function inspection as described in claim 3, characterized in that, The main control module also includes a dynamic monitoring unit, which continuously collects the loop resistance value during the display of each test screen during the screen detection process. When the loop resistance value fluctuates beyond the preset fluctuation threshold, it is determined that there is a dynamic contact failure. The main control module then locks the current screen and triggers an alarm.

5. The integrated detection device for module screen inspection and BTB function inspection as described in claim 4, characterized in that, The preset standard resistance range is set based on the nominal resistance of the sampling resistor and the allowable contact impedance range, and the preset fluctuation threshold is determined based on the nominal resistance of the sampling resistor and the preset fluctuation percentage.

6. The integrated testing device for module screen inspection and BTB function inspection as described in claim 1, characterized in that, The main control module also includes an identifier generation unit. When all test screens pass the test and the circuit resistance is normal throughout, the identifier generation unit controls the test machine to overlay and print the "BTB OK" identifier on the last test screen.

7. The integrated testing device for module screen inspection and BTB function inspection as described in claim 1, characterized in that, The main control module also includes a data storage unit, which is used to store the loop resistance detection data and screen detection results of each display module under test in real time, forming a traceable detection record.

8. A method for integrating module screen inspection and BTB function inspection, applied to the inspection device as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: Assemble the display module to be tested into the pin mold fixture, so that the test probes make corresponding contact with each pin of the BTB connector; Step 2: The resistance monitoring module obtains the initial resistance value of the BTB line through the detection circuit and compares it with the preset standard resistance value range; Step 3: If the initial resistance value exceeds the preset standard resistance value range, it is determined that the BTB connector has a short circuit or open circuit defect. The main control module locks the screen detection process and triggers an alarm. Step 4: If the initial resistance value is within the preset standard resistance value range, the main control module starts the screen detection program and outputs multiple test screens in sequence; Step 5: During the display of each test screen, the resistance monitoring module continuously monitors the circuit resistance value. When the circuit resistance value fluctuates beyond the preset fluctuation threshold, it is determined that there is a dynamic contact failure. The main control module locks the current screen and triggers an alarm. Step 6: When all test screens pass the test and the circuit resistance is normal throughout, the main control module controls the test machine to print the "BTB OK" mark on the last test screen to complete the test.

9. The integrated detection method for module screen inspection and BTB function inspection as described in claim 8, characterized in that, In step two, the resistance monitoring module obtains the circuit resistance information by outputting a preset constant current to the detection circuit and collecting the voltage values ​​at both ends of the circuit.

Images