A high-precision touch testing system for curved screens

Abstract

This utility model discloses a high-precision touch testing system for curved screens, comprising a worktable. An adaptive curved screen leveling and clamping device is mounted on the top of the worktable. The worktable also includes an X-axis linear drive device, a Y-axis linear drive device, a Z-axis vertical drive mechanism, and a multi-functional stylus switching device. A copper head device that contacts the screen is mounted on the Z-axis vertical drive mechanism. A seven-degree-of-freedom collaborative robotic arm is mounted on one side of the adaptive curved screen leveling and clamping device, and an intelligent end effector is mounted at the end of the seven-degree-of-freedom collaborative robotic arm. Above the worktable are a machine vision positioning device for coarse positioning of the product under test and a visual calibration device for spatial mapping calibration of touch point positions. This utility model achieves automated leveling, curvature modeling, and quantitative testing of edge touch performance for curved screens, effectively solving the problems of poor compatibility and insufficient edge touch accuracy.

Description

Technical Field

[0001] This utility model relates to the field of electronic device screen testing technology, and in particular to a high-precision touch testing system for curved screens. Background Technology

[0002] As smart terminal devices evolve towards higher interactivity and immersive experiences, curved touchscreens, due to their superior visual performance and user-friendly operation, have been widely adopted in numerous fields such as high-end smartphones, automotive displays, and wearable devices. The rise of curved screens has significantly improved the visual effects and user experience of products in these fields, making smart devices more attractive and competitive in the market. For example, in high-end smartphones, the immersive visual experience provided by curved screens makes users feel as if they are in a wider field of view, enhancing entertainment experiences such as watching movies and playing games; in automotive displays, curved screens can better fit the interior space layout, providing drivers and passengers with clear and comfortable display information; in the field of wearable devices, curved screens can better conform to the curves of the human body, improving wearing comfort and aesthetics.

[0003] Before the advent of curved screens, testing methods for flat touchscreens were relatively mature. Traditional flat touchscreen testing primarily relied on static coordinate detection and the ring electrode method. Static coordinate detection typically involves applying touch actions at fixed coordinate positions to assess screen responsiveness. This method records screen feedback information by performing clicks or swipes at preset coordinate points, thus evaluating touch accuracy. It is intuitive, easy to understand and implement, and widely used in flat screen testing. The ring electrode method uses ring electrodes arranged around the screen to sense changes in touch signals. When a touch occurs, the ring electrodes detect corresponding electrical signal fluctuations. By analyzing and processing these signals, the location of the touch point is determined. This method utilizes the principle of electric field distribution and can accurately detect touch actions. Furthermore, using a microcontroller for simple logic testing is also a common approach. A microcontroller can issue instructions according to a pre-programmed sequence to control the execution of touch actions and data acquisition. It analyzes the screen's response to determine if the screen is functioning correctly, making it suitable for applications with relatively low accuracy requirements. Meanwhile, the traditional press test method is also frequently used, where operators manually press specific parts of the screen and observe the screen's reaction and feedback to make a preliminary judgment on the screen's touch performance.

[0004] However, due to the non-planar nature of curved screens, the traditional testing methods for planar touchscreens have significant limitations when dealing with curved screens. Traditional planar touchscreen testing methods cannot effectively adapt to the curvature variations of curved screens, leading to systematic biases in touch point coordinate detection and severely impacting test accuracy. Furthermore, the edges of curved screens are prone to touch signal attenuation or false triggering due to curvature variations, and existing testing solutions struggle to accurately quantify edge touch performance and effectively address issues such as touch signal drift and false edge touch detection caused by screen curvature changes. Utility Model Content

[0005] This application provides a high-precision touch testing system for curved screens, which realizes automated leveling, curvature modeling and quantitative testing of edge touch performance of curved screens, effectively solving the problems of poor compatibility and insufficient edge touch accuracy.

[0006] This application provides a high-precision touch testing system for curved screens, which adopts the following technical solution:

[0007] A high-precision touch testing system for curved screens includes a worktable. An adaptive curved screen leveling and clamping device is mounted on the top of the worktable. The worktable also includes an X-axis linear drive device, a Y-axis linear drive device, a Z-axis vertical drive mechanism, and a multi-functional stylus switching device. A copper head device that contacts the screen is mounted on the Z-axis vertical drive mechanism. A seven-degree-of-freedom collaborative robotic arm is mounted on one side of the adaptive curved screen leveling and clamping device. An intelligent end effector is mounted at the end of the seven-degree-of-freedom collaborative robotic arm. Above the worktable are a machine vision positioning device for coarsely positioning the product under test and a visual calibration device for spatial mapping calibration of touch point positions.

[0008] By adopting the above technical solutions, this utility model designs a high-precision touch testing system for curved screens. During use, the adaptive curved screen leveling clamping device on the top of the worktable enables rapid positioning and dynamic leveling of the curved screen, ensuring the flatness of the test reference plane. The X-axis linear drive device and the Y-axis linear drive device form a planar orthogonal motion system, achieving precise linear displacement in the horizontal direction. The Z-axis vertical drive mechanism achieves precise lifting and lowering motion in the vertical direction. The copper head device, while enabling screen click / draw functions, avoids mechanical damage to the touchscreen surface through a buffer structure. The seven-degree-of-freedom collaborative robotic arm device, in conjunction with an intelligent end effector, can meet the full-posture testing needs of complex curved screens, achieving intelligent switching between planar / curved touch modes and automatic replacement of testing tools. The machine vision positioning device enables rapid coarse positioning of the tested product. The visual calibration device enables spatial mapping calibration of touch point positions. This method is effectively applicable to high-precision touch accuracy testing of curved screens, solving problems such as the incompatibility of traditional planar screen testing methods with curved screen curvature changes, difficulty in detecting edge mis-touches, inconsistent testing standards, and insufficient compatibility. It improves testing accuracy, precision, and efficiency, and enhances compatibility.

[0009] Preferably, the adaptive curved screen leveling clamping device includes mutually orthogonal θX-axis rotation adjustment mechanism, θY-axis rotation adjustment mechanism and θZ-axis horizontal rotation adjustment mechanism, and the θX-axis and θY-axis adjustment mechanisms are both driven by servo motors.

[0010] By adopting the above technical solution, the adaptive curved screen leveling clamping device uses a three-axis rotation adjustment mechanism with mutually orthogonal θX, θY, and θZ axes. The θX and θY axis adjustment mechanisms are driven by servo motors, which can realize flexible adjustment of the working plane of the curved screen at multiple angles, so that the curved screen can be more accurately positioned in a suitable test position. It realizes high-precision and automated leveling operation, ensuring the test reference flatness of the curved screen, thereby improving the accuracy of touch precision testing of curved screens, solving the testing problems caused by changes in screen curvature, and adapting to curved screens of different curvatures and sizes to complete high-precision testing.

[0011] Preferably, the adaptive curved screen leveling clamping device further includes a product clamping device for fixing the product to be tested and a side button clicking device.

[0012] By adopting the above technical solutions, the product clamping device can fix the product under test during use, which helps to improve test stability, ensure that the test process is not affected by external factors, and thus improve test accuracy; the side button clicking device can support the travel test of side buttons such as power button and volume button, making the test range more comprehensive.

[0013] Preferably, the Z-axis vertical drive mechanism includes a Z-axis moving module and a first pressure sensor.

[0014] By adopting the above technical solution, during use, the Z-axis moving module can make the copper head device move vertically along the Z-axis direction. The first pressure sensor can monitor the pressure when the copper head device contacts the screen in real time and convert the force signal into a standard electrical signal output, which helps to accurately control the contact pressure of the copper head device on the screen, thereby improving the accuracy and effectiveness of curved screen touch accuracy testing.

[0015] Preferably, the multi-functional stylus switching device can automatically identify and switch the contact points of different test modes. The multi-functional stylus switching device includes a flexible buffer mechanism in the X-axis direction and a flexible buffer mechanism in the Y-axis direction. The flexible buffer mechanism in the X-axis direction and the flexible buffer mechanism in the Y-axis direction are respectively used to provide flexible displacement compensation in the X-axis direction and to realize passive displacement compensation along the Y-axis direction.

[0016] By adopting the above technical solution, the multi-functional stylus switching device can automatically identify and switch the contacts of different test modes during use, improving the convenience of testing. At the same time, the flexible buffer mechanism in the X-axis direction provides flexible displacement compensation in the X-axis direction, and the flexible buffer mechanism in the Y-axis direction realizes passive displacement compensation along the Y-axis direction, which can cope with possible displacement deviations and ensure the stability and accuracy of the test process.

[0017] Preferably, the multi-functional stylus switching device further includes a detection device and a copper head placement plate. The detection device detects the presence of the contact head in real time and outputs a switching signal. The copper head placement plate enables the replacement of the copper head.

[0018] By adopting the above technical solution, the detection device in the multi-functional stylus switching device can monitor the presence of the contact head in real time during use, avoiding the impact of abnormal contact head on the test. The copper head placement plate facilitates copper head replacement and improves test efficiency.

[0019] Preferably, the intelligent end effector integrates a precision positioning vision system and a voice coil motor drive device. The voice coil motor drive device consists of a voice coil motor, a linear guide mechanism, and an elastic reset component. It is linked with the stylus module to achieve high-frequency, precise dot-mapping tests. A second pressure sensor is installed above the voice coil motor.

[0020] By adopting the above technical solutions, the intelligent end effector integrates a precision positioning vision system to perform pixel-level image acquisition and coordinate positioning of the touch screen display interface during use, thereby improving positioning accuracy. The voice coil motor drive device consists of a voice coil motor, a linear guide mechanism, and an elastic reset component, and is linked with the stylus module to achieve high-frequency precise dot-mapping tests. A second pressure sensor is installed above the voice coil motor to detect the dynamic pressure value when the copper head and the shaped finger contact the touch screen in real time.

[0021] Preferably, the visual calibration device includes a bottom shell, a camera fixing block inside the bottom shell, and a miniature camera inside the camera fixing block. The bottom shell is also provided with a force calibration column for linear calibration of the end effector pressure sensor, a copper head calibration column for establishing coordinate association between different robotic arm copper heads, and a third pressure sensor.

[0022] By adopting the above technical solution, the visual calibration device can achieve dynamic calibration of touch pressure value and spatial mapping calibration of touch point position during use. The force calibration column can be used to perform linear calibration of the end effector pressure sensor, and the copper head calibration column can be used to establish coordinate association between copper heads of different robotic arms.

[0023] In summary, this application has the following beneficial effects:

[0024] 1. This utility model designs a high-precision touch testing system for curved screens, which realizes rapid positioning and dynamic leveling of the curved screen under test through an adaptive curved screen leveling clamping device. It can adapt to curved screens of different curvatures and sizes, and solve the problem of multi-product line testing and adaptation in the industry.

[0025] 2. This utility model designs a high-precision touch testing system for curved screens, which adopts pressure sensing and machine vision technology, such as a machine vision positioning device for rapid coarse positioning of the product under test, and a visual calibration device for spatial mapping and calibration of touch point positions. Combined with an intelligent end effector, it realizes intelligent switching between planar / curved touch modes and automatic replacement of testing tools, as well as a multi-functional stylus switching device to realize automatic identification and switching of touches for different testing modes. It effectively solves the problem of touch signal drift, reduces the systematic deviation of touch point coordinate detection, and accurately quantifies edge touch performance.

[0026] 3. This utility model designs a high-precision touch testing system for curved screens, which uses automated mechanical devices such as X-axis linear drive devices, Y-axis linear drive devices, Z-axis vertical drive mechanisms, and seven-degree-of-freedom collaborative robotic arm devices to replace manual visual inspection, forming a standardized testing process and avoiding differences in test results caused by different operators. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0028] Figure 2 This is a schematic diagram of the adaptive curved screen leveling clamping device shown in the embodiment;

[0029] Figure 3 This is a schematic diagram showing the structure of the Z-axis vertical drive mechanism in the embodiment;

[0030] Figure 4 This is a schematic diagram showing the structure of the multi-functional stylus switching device in the embodiment;

[0031] Figure 5 This is a schematic diagram showing the structure of the intelligent end effector in the embodiment;

[0032] Figure 6 This is a cross-sectional view showing the visual acuity calibration device in the embodiment;

[0033] Explanation of reference numerals in the attached drawings: 1. Worktable; 2. Adaptive curved screen leveling and clamping device; 21. θX-axis rotation adjustment mechanism; 22. θY-axis rotation adjustment mechanism; 23. θZ-axis horizontal rotation adjustment mechanism; 24. Product clamping device; 25. Side button clicking device; 3. X-axis linear drive device; 4. Y-axis linear drive device; 5. Z-axis vertical drive mechanism; 51. Z-axis moving module; 52. First pressure sensor; 6. Multifunctional stylus switching device; 61. X-axis flexible buffer mechanism; 62. Y... 63. Axial flexible buffer mechanism; 64. Presence / absence device; 7. Copper head placement plate; 8. Copper head device; 9. Seven-DOF collaborative robotic arm device; 10. Intelligent end effector; 11. Precision positioning vision system; 12. Voice coil motor drive device; 13. Second pressure sensor; 14. Machine vision positioning device; 15. Visual acuity calibration device; 16. Bottom shell; 17. Camera mounting block; 18. Miniature camera; 19. Force calibration post; 10. Copper head calibration post; 111. Third pressure sensor. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," "lower," "bottom," and "top" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0035] This utility model discloses a high-precision touch testing system for curved screens, such as... Figures 1 to 6As shown, the system includes a worktable 1, an adaptive curved screen leveling and clamping device 2, an X-axis linear drive device 3, a Y-axis linear drive device 4, a Z-axis vertical drive mechanism 5, a multi-functional stylus switching device 6, a seven-degree-of-freedom collaborative robotic arm device 8, an intelligent end effector 9, a machine vision positioning device 10, and a visual calibration device 11. The adaptive curved screen leveling and clamping device 2 is located on top of the worktable 1. The X-axis linear drive device 3, the Y-axis drive device 4, the Z-axis vertical drive mechanism 5, and the multi-functional stylus switching device 6 are located on the worktable 1. The copper head device 7 is located on the Z-axis vertical drive mechanism 5 and contacts the screen. The seven-degree-of-freedom collaborative robotic arm device 8 is located on one side of the adaptive curved screen leveling and clamping device 2. The intelligent end effector 9 is located at the end of the seven-degree-of-freedom collaborative robotic arm device 8. The machine vision positioning device 10 and the visual calibration device 11 are located above the worktable 1. This layout and component coordination enable the entire testing system to operate efficiently and orderly, achieving high-precision testing of the touch accuracy of the curved screen.

[0036] Specifically, the adaptive curved screen leveling clamping device 2 includes mutually orthogonal θX-axis rotation adjustment mechanism 21, θY-axis rotation adjustment mechanism 22, and θZ-axis horizontal rotation adjustment mechanism 23. Both the θX-axis and θY-axis adjustment mechanisms are driven by servo motors. The θX-axis rotation adjustment mechanism 21 can be considered a servo motor-driven rotation structure, as servo motors have excellent speed regulation and positioning performance. When the servo motor is working, it drives the rotation mechanism to rotate through transmission components, thereby adjusting the angle of the curved screen under test around the X-axis. The θY-axis rotation adjustment mechanism 22 is similar to the θX-axis rotation adjustment mechanism 21, also driven by a servo motor, and its function is to adjust the angle of the curved screen under test around the Y-axis. Its structure and principle are the same as the θX-axis rotation adjustment mechanism 21, only the rotation direction is different. The θZ-axis horizontal rotation adjustment mechanism 23 enables the curved screen under test to perform continuous rotational motion around the Z-axis. Its outer shell is usually made of metal to ensure sufficient strength and stability. Specifically, the control system calculates the required rotation angle and speed of each rotating mechanism based on the initial position and target posture of the curved screen. Then, it controls servo motors and other power components to drive the rotating mechanism to rotate. The mechanism stops when it reaches the specified angle, thus completing the leveling operation.

[0037] The adaptive curved screen leveling clamping device 2 also includes a product clamping device 24 for fixing the product under test and a side button clicking device 25. The product clamping device 24 primarily serves to fix the curved screen under test; it consists of a ball screw with forward and reverse threads and a linear guide rail. The ingenious design of the forward and reverse threaded ball screw allows the sliders on both sides to move synchronously in opposite directions when the screw rotates. Combined with the linear guide rail, the guide rail provides stable guidance and support for the slider movement, enabling the curved screen to automatically center and position itself in the XY plane. When the curved screen needs to be replaced or its position adjusted, simply reverse the screw rotation, causing the sliders to move in the opposite direction, thus releasing or re-fixing the curved screen. The side button clicking device 25 is a multi-directional side button triggering mechanism that integrates a micro servo motor and a two-degree-of-freedom hinge adjustment device. The two-degree-of-freedom hinge adjustment device allows the side button clicking device 25 to be flexibly adjusted in two directions, much like a human joint that can bend and rotate. This flexible adjustment capability allows it to adapt to side buttons in various positions and angles on curved screens, such as the power button and volume buttons on the side of a mobile phone or tablet. During testing, the micro servo motor starts, driving the hinge adjustment device to activate the side buttons, thereby testing the functionality and performance of the side buttons. Through the close cooperation and division of labor between the two, the product clamping device 24 ensures that the curved screen is stably centered, and the side button clicking device 25 can accurately test the side buttons. Their mutual cooperation ensures comprehensive and accurate testing of the curved screen.

[0038] The X-axis linear drive device 3 includes a transmission system consisting of a servo motor, a precision ball screw, and a linear guide. The precision ball screw is the core component of the transmission system; its thread machining precision is very high, allowing the balls to roll smoothly within the raceway, reducing frictional resistance and improving transmission efficiency. Furthermore, the ball screw converts the motor's rotational motion into linear motion, enabling connected components to move along the X-axis. The Y-axis linear drive device 4 uses a servo motor-screw-guide transmission system identical to the X-axis system, with a working principle basically the same as the X-axis linear drive device 3. However, it drives components to achieve independent linear displacement along the horizontal Y-axis. The Z-axis vertical drive mechanism 5 is equipped with a copper head device 7 that contacts the screen. The Z-axis vertical drive mechanism 5 includes a Z-axis movement module 51 and a first pressure sensor 52. The Z-axis movement module 51 achieves vertical displacement along the Z-axis through the coordinated transmission of the servo motor, the precision ball screw, and the linear guide. The servo motor generates power, the precision ball screw converts rotational motion into linear motion, and the linear guide ensures smooth and precise movement. The first pressure sensor 52 is typically positioned between the copper head device 7 and the Z-axis movement module 51. It operates using principles such as strain gauges. When the copper head device 7 contacts the screen and generates pressure, the sensor detects the pressure change and converts it into an electrical signal, which is then transmitted to the control system. These three drive mechanisms cooperate to move corresponding components in different directions, much like drawing trajectories in three-dimensional space. This coordinated action of the three mechanisms can meet the precise testing requirements in various scenarios.

[0039] The multi-functional stylus switching device 6 enables automatic identification and switching of contacts for different testing modes. It includes a flexible buffer device in the X-axis direction and a flexible buffer device in the Y-axis direction. The flexible buffer device in the X-axis direction is an X-axis elastic compensation mechanism consisting of a linear guide rail and a pre-compression spring. The linear guide rail provides a track for the buffer device, ensuring linear movement of the device in the X-axis direction. The pre-compression spring stores and releases elastic potential energy; when an external force is applied to the device, the spring is compressed to absorb energy and act as a buffer. For example, when the copper head device 7 encounters resistance while moving in the X-axis direction, the spring is compressed, reducing the impact force on the device and the curved screen. An alternative structure is to use a rubber buffer pad to replace the spring to achieve the buffering function. The flexible buffer device in the Y-axis direction is a Y-axis elastic compensation mechanism, consisting of a buffer system composed of a linear guide rail and a pre-compression spring. The linear guide rail ensures smooth movement of the components along the Y-axis direction, and the pre-compression spring expands and contracts when subjected to external force, acting as a buffer. The multi-functional stylus switching device 6 also includes a detection device 63 and a copper head placement plate 64. The presence / absence detection device 63 is a copper head in-position detection system, employing a Hall effect sensor as the sensing element. The Hall effect sensor works by detecting the presence or absence of an object based on changes in the magnetic field. When the copper head approaches the sensor, the magnetic field changes, and the sensor outputs a switching signal indicating that the copper head is in place. If there is no copper head, the sensor outputs a signal indicating its absence. The copper head placement plate 64 is equipped with guide grooves and a placement positioning interface, guiding the copper head to be accurately placed in the corresponding position. The placement positioning interface ensures that the angle and position of the copper head are accurate, enabling rapid replacement and precise positioning of the copper head. These components work closely together to achieve automatic identification and switching of contacts for different testing modes.

[0040] The seven-DOF collaborative robotic arm device 8 employs a high-precision six-axis articulated robotic arm in conjunction with an end effector. Each joint is driven by a motor, and the rotation angle and speed of each joint can be flexibly controlled through a precise control system. During operation, according to a pre-set program or real-time commands, the joints rotate in coordination, driving the end effector to the designated position and posture. For example, when drawing a complex pattern on a curved surface, the six-axis articulated robotic arm can continuously adjust its posture, allowing the end effector to move along the trajectory of the pattern. The end effector is the intelligent end effector 9, which integrates a precision positioning vision system 91 and a voice coil motor drive device 92. The precision positioning vision system 91 includes a high-resolution industrial camera, a telecentric optical lens, and a camera mounting frame. The high-resolution industrial camera acts like a pair of keen eyes, capable of capturing clear images of tiny objects. The telecentric optical lens provides excellent image quality, reducing distortion and ensuring that the captured images are realistic and accurate. The camera mounting frame firmly fixes the camera in the appropriate position. Through image processing algorithms, the system can perform pixel-level image acquisition and coordinate positioning of the touchscreen display interface. The voice coil motor drive unit 92 consists of a voice coil motor, a linear guide mechanism, and an elastic reset component. The voice coil motor includes a mover and a stator; when energized, the mover will generate linear motion under the influence of a magnetic field. A second pressure sensor 93 is installed above the voice coil motor. Similar in working principle to the first pressure sensor 52 on the Z-axis vertical drive mechanism 5, it detects the dynamic pressure value when the copper tip and the shaped finger contact the touchscreen in real time. This device, in conjunction with the stylus module, enables high-frequency, precise dot-mapping tests. When a test command is received, the precision positioning vision system 91 first locates the target position, and the voice coil motor drive unit 92 drives the stylus or copper tip to quickly and accurately strike the target position, completing the dot-mapping test task.

[0041] The machine vision positioning device 10, combined with image processing algorithms, enables rapid coarse positioning of the product under test. It typically consists of an industrial camera, a matching image acquisition card, and image processing software. The industrial camera is mounted at a suitable position above the workbench 1, capturing an overall image of the workbench 1 and the curved screen under test. The image acquisition card converts the image signals captured by the industrial camera into digital signals and transmits them to the image processing software on the computer. The image processing software uses algorithms such as color recognition and edge detection to find the approximate outline and position of the curved screen under test, compares and matches it with a preset template, and then determines the approximate position of the curved screen on the workbench 1, providing initial position information for subsequent precise testing. For example, when the curved screen is initially placed, the machine vision positioning device 10 can quickly tell the control system approximately where the curved screen is located. The vision calibration device 11 includes a base shell 111, a camera fixing block 112 within the base shell 111, and a miniature camera 113 within the camera fixing block 112. It is equipped with a positioning reference surface and a fastening interface. The positioning reference surface ensures the positional accuracy of each functional component, while the fastening interface is used to firmly fix each component inside the base shell 111. The camera fixing block 112 is used to fix and adjust the spatial position of the miniature camera 113.

[0042] The visual calibration device 11 also includes a force calibration post 114, a copper head calibration post 115, and a third pressure sensor 116 within its base housing 111. The force calibration post 114 is a standard force transmission component, typically cylindrical in shape and made of a high-strength metal with stable elastic modulus. Its function is to perform linear calibration of the end effector pressure sensor. When the force calibration post 114 is subjected to a known force, it transmits the force to the pressure sensor. By comparing the value displayed by the sensor with the known force value, the sensor can be calibrated. The copper head calibration post 115 is a coordinate transformation reference component, primarily used to establish the coordinate relationship between the copper heads of different robotic arms. Different robotic arms may have different positions and orientations of their copper heads during operation; the copper head calibration post 115 acts as a reference coordinate origin, helping to unify the coordinate system of the copper heads of various robotic arms. The third pressure sensor 116 operates on the same principle as the second pressure sensor 93, forming a closed-loop calibration system with the force calibration post 114. The force value information fed back by the third pressure sensor 116 is compared and adjusted with the standard force value applied by the force calibration column 114, thereby realizing the measurement accuracy verification.

[0043] Working Principle: The high-precision touch testing system for curved screens of this invention boasts advantages such as high precision, automation, and strong compatibility. The adaptive curved screen leveling clamping device 2 levels and positions the curved screen under test, solving the problem of difficulty in accurately locating the test posture due to the non-planar nature of curved screens. Multiple precisely adjustable rotation mechanisms and accurate positioning fixtures can adapt to curved screens of different sizes and curvatures, greatly improving the applicability of the test. The X-axis linear drive device 3, Y-axis linear drive device 4, and Z-axis vertical drive mechanism 5 work together to allow test components such as the copper head device 7 to move to any desired position in three-dimensional space, accurately testing various areas of the curved screen and overcoming the problem that traditional planar screen testing methods cannot adapt to changes in the curvature of curved screens. The multi-functional stylus switching device 6 can automatically identify and switch between different test mode styluses to cope with various complex test scenarios. The machine vision positioning device 10 achieves rapid coarse positioning, while the visual calibration device 11 performs fine coordinate transformation and accuracy verification, ensuring the accuracy of test positioning and the reliability of measurement results. The seven-DOF collaborative robotic arm device 8 and the intelligent end effector 9 work together ingeniously. They can flexibly handle the full-pose testing requirements of complex curved screens, enabling intelligent switching between planar and curved touch modes and automatic replacement of testing tools. Especially when testing the edge areas of curved screens, they solve the edge touch testing problem through precise positioning and pressure control, accurately quantifying edge touch performance.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-precision touch testing system for curved screens, characterized in that: The device includes a workbench (1), on the top of which is an adaptive curved screen leveling clamping device (2). The workbench (1) is also equipped with an X-axis linear drive device (3), a Y-axis linear drive device (4), a Z-axis vertical drive mechanism (5), and a multi-functional stylus switching device (6). The Z-axis vertical drive mechanism (5) is equipped with a copper head device (7) that contacts the screen. A seven-degree-of-freedom collaborative robotic arm device (8) is provided on one side of the adaptive curved screen leveling clamping device (2). An intelligent end effector (9) is provided at the end of the seven-degree-of-freedom collaborative robotic arm device (8). A machine vision positioning device (10) for coarse positioning of the product under test and a visual calibration device (11) for spatial mapping calibration of the touch point position are provided above the workbench (1).

2. The high-precision touch testing system for curved screens according to claim 1, characterized in that: The adaptive curved screen leveling clamping device (2) includes mutually orthogonal θX-axis rotation adjustment mechanism (21), θY-axis rotation adjustment mechanism (22) and θZ-axis horizontal rotation adjustment mechanism (23). The θX-axis and θY-axis adjustment mechanisms are both driven by servo motors.

3. The high-precision touch testing system for curved screens according to claim 1, characterized in that: The adaptive curved screen leveling clamping device (2) also includes a product clamping device (24) for fixing the product to be tested and a side button clicking device (25).

4. The high-precision touch testing system for curved screens according to claim 1, characterized in that: The Z-axis vertical drive mechanism (5) includes a Z-axis moving module (51) and a first pressure sensor (52).

5. The high-precision touch testing system for curved screens according to claim 1, characterized in that: The multi-functional stylus switching device (6) can realize the automatic identification and switching of different test mode contacts. The multi-functional stylus switching device (6) includes an X-axis flexible buffer mechanism (61) and a Y-axis flexible buffer mechanism (62). The X-axis flexible buffer mechanism (61) and the Y-axis flexible buffer mechanism (62) are respectively used to provide flexible displacement compensation in the X-axis direction and realize passive displacement compensation along the Y-axis direction.

6. The high-precision touch testing system for curved screens according to claim 1, characterized in that: The multi-functional stylus switching device (6) also includes a detection device (63) and a copper head placement plate (64). The detection device (63) detects the presence of the contact head in real time and outputs a switching signal. The copper head placement plate (64) can realize the replacement of the copper head.

7. The high-precision touch testing system for curved screens according to claim 1, characterized in that: The intelligent end effector (9) integrates a precision positioning vision system (91) and a voice coil motor drive device (92). The voice coil motor drive device (92) consists of a voice coil motor, a linear guide mechanism, and an elastic reset component. It is linked with the stylus module to achieve high-frequency precise dot testing. A second pressure sensor (93) is set above the voice coil motor.

8. The high-precision touch testing system for curved screens according to claim 1, characterized in that: The visual calibration device (11) includes a bottom shell (111), a camera fixing block (112) inside the bottom shell (111), and a miniature camera (113) inside the camera fixing block (112). The bottom shell (111) is also provided with a force calibration column (114) for linear calibration of the end effector pressure sensor, a copper head calibration column (115) for establishing coordinate association between different robotic arm copper heads, and a third pressure sensor (116).

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