A test bending mechanism for OLED screen
By using a reference plate calibration and synchronous clamping device, the initial state calibration problem of the OLED screen bending test mechanism was solved, achieving high-precision dynamic bending monitoring and automated operation, ensuring the accuracy and stability of the test results.
Patent Information
- Application Number
- CN202522496762.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-11-25
AI Technical Summary
The existing OLED screen bending test mechanism has insufficient initial calibration accuracy, and the clamping positions at the bottom and top of the screen are prone to misalignment, which affects the accuracy of the test results.
The reference plate of the reference mechanism is used to calibrate the initial position of the moving platform. Combined with four synchronously started push rod motors to drive the clamping blocks and symmetrical cylinders to drive the moving clamping plates, and with the help of angle sensors and lead screw transmission, the screen bottom and top are clamped on the same vertical plane and the dynamic bending angle is monitored in real time.
It eliminates initial bending errors, improves the consistency of test benchmarks, ensures stable clamping of the screen during testing, and achieves high-precision dynamic bending angle monitoring and fully automated operation.
Smart Images
Figure CN224945795U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of screen bending testing, in particular to a testing bending mechanism for OLED screens. Background Art
[0002] With the rapid development of flexible display technology, OLED screens are widely used in products such as foldable mobile phones and rollable displays due to their bendable, lightweight and thin characteristics. To ensure the reliability of OLED screens in long-term use, bending tests are required to evaluate key indicators such as fatigue resistance and display stability, thus putting strict requirements on the precision, stability and automation level of the testing bending mechanism; Existing OLED screen bending testing mechanisms have deficiencies, with insufficient calibration precision in the initial state, and non-coplanar deviation is prone to occur at the clamping positions of the bottom end and top end of the screen, resulting in initial bending angle errors and affecting the accuracy of test results; Therefore, there is an urgent need for an OLED screen testing bending mechanism that can realize precise initial state calibration, high-precision angle measurement and a high degree of automation, so as to meet the research and development and mass production testing demands of flexible display products. Contents of the Utility Model
[0003] The purpose of the utility model is to at least solve one of the technical problems existing in the prior art, and to provide a testing bending mechanism for OLED screens that can solve the above problems.
[0004] To achieve the above purpose, the utility model provides the following technical solution: a testing bending mechanism for OLED screens, comprising a base, wherein a sliding guide rail is fixedly connected to the base; A motor is fixedly mounted on the base, the output end of the motor is fixedly connected with a lead screw, the lead screw is located inside the sliding guide rail, and the lead screw is rotatably connected with the sliding guide rail; A sliding block is slidably connected in the sliding guide rail, the sliding block is rotatably connected with the lead screw, a moving platform is fixedly connected to the sliding block, and a fixing plate is fixedly connected to the moving platform; A bracket is fixedly connected to the base, and the bracket comprises a vertical column and a cross beam; A reference mechanism is arranged on the inner side of the vertical column of the bracket, the reference mechanism comprises a fixing frame, a damping rotating shaft and a reference plate, the fixing frame is fixed on the inner side of the vertical column, the inner side of the fixing frame is rotatably connected with the damping rotating shaft, and the reference plate is sleeved on the damping rotating shaft.
[0005] Preferably, the sliding guide rail is of a hollow square shape, and the fixing plate is of a hollow square shape.
[0006] Preferably, the fixed plate has round holes on both sides, and a push rod motor is fixedly installed on the moving platform. The round holes are slidably connected to the push rod of the push rod motor. A clamping block is fixedly connected to one end of the push rod motor located inside the fixed plate. There are four push rod motors in total, which start synchronously.
[0007] Preferably, the support has four columns, and a crossbeam is fixedly connected to each column. The four crossbeams form a U-shape.
[0008] Preferably, the inner sides of the two crossbeams in the bracket are provided with sliding grooves, the sliding grooves are symmetrically arranged, and the inner sides of the other two crossbeams are respectively fixedly connected with cylinders. The output end of the cylinder is fixedly connected with a movable clamping plate. A robotic arm is fixedly connected to the crossbeam in the bracket, and a pneumatic gripper is fixedly installed at the tail end of the robotic arm.
[0009] Preferably, the clamping surfaces of the movable clamps are fixedly bonded with a pre-tightening device, and the two movable clamps are arranged symmetrically.
[0010] Preferably, when the reference plate is flat, one side contacts the moving platform. After the reference plate is flat, its working surface forms a horizontal positioning surface. When the moving platform is attached to this surface, the inner clamping reference surface of the fixed plate of the moving platform will be forcibly aligned to the vertical reference surface. The clamping surface of the movable clamping plate has been pre-calibrated to the same vertical reference surface, thereby determining that the initial position of the moving platform and the movable clamping plate are on the same vertical plane when clamping the top of the screen.
[0011] Preferably, an angle sensor is fixedly connected to the bottom of the mobile platform.
[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This test bending mechanism for OLED screens calibrates the initial position of the moving platform through the reference plate of the reference mechanism, ensuring that the bottom and top clamping areas of the screen are on the same vertical plane, eliminating initial bending errors from the source and improving the consistency of the test reference.
[0013] 2. The bending test mechanism for OLED screens uses four synchronously started push rod motors to drive the clamping blocks, so as to achieve uniform force on the bottom of the screen. Symmetrical cylinders drive the movable clamping plates in conjunction with the pre-tightening device to ensure stable clamping force at the top and avoid screen displacement or deformation caused by uneven clamping.
[0014] 3. This OLED screen testing bending mechanism combines non-contact measurement by an angle sensor with the positional correspondence of a lead screw drive to achieve real-time and accurate monitoring of the angle during dynamic bending, balancing response speed and measurement reliability. The U-shaped sliding guide provides a stable trajectory for the moving platform, ensuring consistent bending paths. It can be adapted to different OLED screen sizes by adjusting the stroke of the push rod motor and cylinder, offering good versatility. Attached Figure Description
[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of a testing bending mechanism for an OLED screen according to the present invention; Figure 2 This is a schematic diagram of a testing bending mechanism for an OLED screen according to the present invention; Figure 3 This is a cross-sectional schematic diagram of a testing bending mechanism for OLED screens according to the present invention. Figure 4 This is a cross-sectional schematic diagram of a testing bending mechanism for OLED screens according to the present invention. Figure 5 for Figure 1 Enlarged view of a portion of point A in the middle.
[0016] Reference numerals: 1. Base; 2. Sliding guide rail; 3. Motor; 4. Lead screw; 5. Slider; 6. Moving platform; 7. Fixed plate; 8. Circular hole; 9. Push rod motor; 10. Clamping block; 11. Bracket; 12. Reference structure; 1201. Fixed frame; 1202. Damping shaft; 1203. Reference plate; 13. Slide groove; 14. Cylinder; 15. Movable clamping plate; 16. Pre-tightening device; 17. Angle sensor; 18. Robotic arm; 19. Pneumatic gripper. Detailed Implementation
[0017] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.
[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0019] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.
[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0021] Please see Figure 1-5 This utility model provides a technical solution: a test bending mechanism for OLED screens, including a base 1, a sliding guide rail 2 fixedly connected to the base 1, the sliding guide rail 2 being U-shaped, a motor 3 fixedly installed on the base 1, a lead screw 4 fixedly connected to the output end of the motor 3 via a coupling, the lead screw 4 being located inside the sliding guide rail 2 and rotatably connected to the sliding guide rail 2, a slider 5 slidably connected inside the sliding guide rail 2, the slider 5 being helically connected to the lead screw 4 via an internal thread, and a moving platform 6 fixedly connected to the slider 5; A fixed plate 7 is fixedly connected to the mobile platform 6. The fixed plate 7 is in the shape of a U-shape. Circular holes 8 are opened on both sides of the fixed plate 7. A push rod motor 9 is fixedly installed on the mobile platform 6. The push rod motor 9 is a model of Tuoda TD-808. The push rod of the push rod motor 9 is slidably connected to the circular hole 8. A clamping block 10 is fixedly connected to one end of the push rod of the push rod motor 9 located inside the fixed plate 7. The clamping block 10 is used to clamp the bottom of the screen. There are four push rod motors 9 in total. They are controlled to start synchronously through the control panel. The control panel is a model of Weintek MT8102iE. A bracket 11 is fixedly connected to the base 1. The bracket 11 includes columns and crossbeams. There are four columns, and four crossbeams are fixedly connected to the columns, forming a U-shape. Slide grooves 13 are opened on the inner side of two crossbeams, and the slide grooves 13 are symmetrically arranged. Cylinders 14 are fixedly connected to the inner side of the other two crossbeams. The cylinders 14 are of the Airtac SC63-50 model. Movable clamps 15 are fixedly connected to the output end of the cylinders 14. The two movable clamps 15 are symmetrically arranged. Through the cylinders 14 The screen is clamped by moving towards each other. The clamping surface of the movable clamping plate 15 is fixedly connected to a pre-tightening device 16. The pre-tightening device 16 includes a pre-tightening plate and a spring. One end of the spring is connected to the movable clamping plate 15, and the other end is connected to the pre-tightening plate. The pre-tightening plate of the pre-tightening device 16 contacts the screen first. The movable clamping plate 15 is pre-tightened by the spring pre-tightening plate before clamping the screen. The cylinder 14 is controlled by the control panel to move towards each other synchronously to ensure that the screen is not bent at the initial clamping state. A reference structure 12 is provided on the inner side of the two columns of the support 11. The reference structure 12 includes a fixing frame 1201, a damping shaft 1202, and a reference plate 1203. The fixing frame 1201 is fixed to the inner side of the columns of the support 11. The damping shaft 1202 is rotatably connected to the inner side of the fixing frame 1201. The reference plate 1203 is sleeved on the damping shaft 1202. Before the device is used, the reference plate 1203 is laid flat, with one side of the reference plate 1203 in contact with the moving platform 6. After the reference plate 1203 is laid flat, its... The working surface forms a horizontal positioning surface. When the moving platform 6 is attached to this surface, the inner clamping reference surface of the fixed plate 7 of the moving platform 6 will be forcibly aligned with the vertical reference surface. The clamping surface of the movable clamping plate 15 has been pre-calibrated to the same vertical reference surface, thereby determining that the initial position of the moving platform 6 and the movable clamping plate 15 are on the same vertical plane when clamping the top of the screen, ensuring that the initial screen has no bending angle. After determining the initial position, the reference plate 1203 is rotated to a vertical state without affecting the movement of the moving platform 6. An angle sensor 17 is fixedly connected to the bottom of the mobile platform 6. The angle sensor 17 adopts the Keyence LR-ZB250CP high-precision angle sensor 17. The angle sensor 17 adopts the laser triangulation principle. It can calculate the bending angle by measuring the relative displacement difference between two points at the bending point of the screen and combining the geometric relationship. The measurement accuracy is ±0.01°. It has a fast response speed and non-contact measurement to avoid damage to the screen. It is suitable for real-time monitoring of dynamic bending process. According to the transmission principle of lead screw 4 and nut, there is a precise correspondence between the rotation angle of lead screw 4 and the linear movement distance of moving platform 6. Therefore, the movement position of moving platform 6 relative to base 1 can be indirectly measured by measuring the rotation angle of lead screw 4, and thus the bending angle of OLED screen can be obtained. A robotic arm 18, model ELFIN3, is fixedly installed on the crossbeam. A pneumatic gripper 19, model MHZ2-16D, is fixedly installed at the tail end of the robotic arm 18.
[0022] Working principle: When performing a bending test on an OLED screen, first, the reference plate 1203 of the reference structure 12 is laid flat, the motor 3 is started, and one side of the moving platform 6 is brought into contact with the reference plate 1203 to determine that the initial position of the moving platform 6 and the top of the screen held by the movable clamping plate 15 are on the same vertical plane, ensuring that the screen has no bending angle initially. After determining the initial position, the reference plate 1203 is rotated to a vertical state. Then, the robotic arm 18 and pneumatic gripper 19 are activated to place the screen inside the fixed plate 7 of the mobile platform 6, ensuring that the edge of the screen is aligned with the clamping area of the fixed plate 7. Through the synchronous activation of the push rod motor 9, the four clamping blocks 10 move synchronously toward the screen, thereby clamping the bottom of the screen. Next, the cylinder 14 is activated. The output ends of the two symmetrically arranged cylinders 14 push the movable clamping plate 15 to move towards each other along the slide groove 13 of the crossbeam. The pre-tightening device 16 on the clamping surface of the movable clamping plate 15 clamps the top of the screen to ensure that the screen remains stable during the test. Then, motor 3 is turned on, which drives lead screw 4 to rotate. Since lead screw 4 is rotatably connected to sliding guide rail 2, and slider 5 is helically connected to lead screw 4 and slides in sliding guide rail 2, the rotation of lead screw 4 drives slider 5 to move along a specific trajectory in sliding guide rail 2, thereby driving the moving platform 6 fixed on slider 5 to move. During the movement of moving platform 6, the bottom of OLED screen moves with moving platform 6, while the top is fixed, and the screen gradually bends. The angle sensor 17 at the bottom of the mobile platform 6 works in real time. Combined with the correspondence between the rotation angle of the lead screw 4 and the linear movement distance of the mobile platform 6, the movement position of the mobile platform 6 relative to the base 1 is indirectly determined, and the bending angle of the OLED screen is obtained. The staff can keep track of the test progress and the bending status of the screen in real time. After the test is completed, the movable clamping plate 15 driven by the push rod motor 9 and the cylinder 14 is released first. Then, the robotic arm 18 drives the pneumatic gripper 19 to grab the screen after the test. If the screen is qualified, the robotic arm 18 transfers it to the qualified product sorting table. If the screen is unqualified, it is transferred to the unqualified product storage box, realizing the fully automated connection of the process without human intervention. The initial position of the moving platform 6 is calibrated by the reference plate 1203 of the reference structure 12 to ensure that the bottom and top clamping areas of the screen are on the same vertical plane, thereby eliminating the initial bending error from the source and improving the consistency of the test reference. Four synchronously started push rod motors 9 drive clamping blocks 10 to achieve uniform force on the bottom of the screen. Symmetrical cylinders 14 drive movable clamping plates 15 in conjunction with pre-tightening devices to ensure stable clamping force at the top and avoid screen offset or deformation caused by uneven clamping. By combining the non-contact measurement of angle sensor 17 with the positional correspondence of lead screw 4, real-time and accurate monitoring of angles during dynamic bending can be achieved, taking into account both response speed and measurement reliability. The robotic arm 18 and the pneumatic gripper 19 work together to complete the loading, unloading and sorting of screens. The entire process requires no human intervention, improving testing efficiency and reducing human error. The U-shaped sliding guide rail provides a stable trajectory for the moving platform 6, ensuring the consistency of the bending path. It can be adapted to different sizes of OLED screens by adjusting the stroke of the push rod motor 9 and the cylinder 14, and has good versatility. It should be noted that the control of motor 3, push rod motor 9, cylinder 14, angle sensor 17, robotic arm 18, pneumatic gripper 19, etc. in this application can all be achieved by using the program set in the control panel and inputting relevant parameters according to requirements for automated integrated control to achieve orderly operation. The setting of this control method can be achieved by existing technology, such as PLC. Two bellows protective covers can be fitted on the lead screw 4 for dust and moisture protection. The two ends of each bellows protective cover are fixedly connected to one side of the slider 5 and the inner wall of the guide rail 2.
[0023] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. A test bending mechanism for OLED screens, comprising a base (1), characterized in that: A sliding guide rail (2) is fixedly connected to the base (1); A motor (3) is fixedly mounted on the base (1), the output end of the motor (3) is fixedly connected with a lead screw (4), the lead screw (4) is located inside the sliding guide rail (2), and the lead screw (4) is rotatably connected with the sliding guide rail (2); A sliding block (5) is slidably connected in the sliding guide rail (2), the sliding block (5) is rotatably connected with the lead screw (4), a moving platform (6) is fixedly connected to the sliding block (5), and a fixing plate (7) is fixedly connected to the moving platform (6); A bracket (11) is fixedly connected to the base (1), and the bracket (11) comprises a vertical column and a cross beam; A reference mechanism (12) is arranged on the inner side of the vertical column of the bracket (11), the reference mechanism (12) comprises a fixing frame (1201), a damping rotating shaft (1202) and a reference plate (1203), the fixing frame (1201) is fixed on the inner side of the vertical column, the inner side of the fixing frame (1201) is rotatably connected with the damping rotating shaft (1202), and the reference plate (1203) is sleeved on the damping rotating shaft (1202).
2. The testing bending mechanism for an OLED screen according to claim 1, characterized in that: The sliding guide rail (2) is in a hollow square shape, and the fixing plate (7) is in a hollow square shape.
3. The testing bending mechanism for an OLED screen according to claim 1, characterized in that: Round holes (8) are formed on both sides of the fixing plate (7), a push rod motor (9) is fixedly mounted on the moving platform (6), the round holes (8) are in sliding connection with the push rod of the push rod motor (9), one end of the push rod motor (9) located inside the fixing plate (7) is fixedly connected with a clamping block (10), and four push rod motors (9) are provided in total and are started synchronously.
4. The testing bending mechanism for an OLED screen according to claim 1, characterized in that: Four vertical columns are arranged on the bracket (11), cross beams are fixedly connected to the vertical columns, and four cross beams are arranged to form a hollow square shape.
5. The testing bending mechanism for an OLED screen according to claim 1, characterized in that: Chutes (13) are formed on the inner sides of two cross beams in the bracket (11), the chutes (13) are arranged symmetrically, air cylinders (14) are respectively and fixedly connected to the inner sides of the other two cross beams, the output end of each air cylinder (14) is fixedly connected with a movable clamping plate (15), a mechanical arm (18) is fixedly connected to the cross beam in the bracket (11), and a pneumatic clamping jaw (19) is fixedly mounted at the tail end of the mechanical arm (18).
6. The testing bending mechanism for an OLED screen according to claim 5, characterized in that: A pre-tightening device (16) is fixedly bonded to the clamping surface of each movable clamping plate (15), and the two movable clamping plates (15) are arranged symmetrically.
7. The testing bending mechanism for an OLED screen according to claim 1, characterized in that: An angle sensor (17) is fixedly connected to the bottom of the moving platform (6).