LCM display screen black corner repairing device

Abstract

The application relates to the technical field of display screen repairing, in particular to an LCM display screen black corner repairing device. The LCM display screen black corner repairing device comprises a rack, further comprises a detection support which is movably arranged on the rack in three axes, a rotary frame is rotatably arranged on the detection support and is fixedly connected with a rotary motor, the output shaft end of the rotary motor is fixedly connected with the rotary frame, a light supplementing lamp, a hot air blower, a pressing touch rod, a CCD camera, a rotary motor and a laser ranging probe are fixedly and sequentially arranged on the outer circumferential edge of the rotary frame, the end of the pressing touch rod is provided with a pressing head, a pressure sensor is arranged between the pressing head and the pressing touch rod, a rotary frame is fixedly arranged on the output shaft of the rotary motor, two first supporting pincers with adjustable spacing are arranged on the rotary frame, and LED light supplementing side columns are arranged on the side surfaces of the two first supporting pincers. The application has the beneficial effect that a stress releasing, optical light supplementing and electrical performance stabilizing three-in-one cooperative treatment framework is constructed.

Description

Technical Field

[0001] This invention relates to the field of display screen repair technology, specifically to a device for repairing black corners of an LCM display screen. Background Technology

[0002] As a core display component in electronic devices such as smartphones, tablets, and laptops, the quality of LCM (Liquid Crystal Display Module) directly affects the user experience of the terminal device. During the manufacturing, assembly, and long-term use of LCMs, blackening in the four corners of the display screen (i.e., murky corners) is one of the most common and difficult-to-eradicate defects. This defect not only leads to uneven brightness and degraded visual quality, but in severe cases, it can even render the entire display screen unusable, causing significant economic losses to manufacturers and repair service providers. The causes of murky corner defects are complex, mainly including the following three aspects: Firstly, the display bezel is subjected to compressive stress during assembly or use, causing uneven changes in the thickness of the liquid crystal cell at the corners, which in turn leads to a decrease in the optical transmittance of that area. Secondly, the light efficiency naturally decreases at the edges of the backlight module, resulting in lower brightness at the corners compared to the center. Third, moisture seeps into the display module through the gaps in the frame, causing electrical drift and further exacerbating brightness decay in the corner areas. These factors often overlap and work together, making it difficult to attribute the black corner defect to a single factor, thus increasing the difficulty of repair. Currently, the industry mainly uses the following methods to deal with black corner defects in LCM displays: the first is manual repair, the second is replacement of the entire unit or backlight module, and the third is to use conventional single-function repair equipment. Currently, there are some detection or repair devices for display screen defects on the market. For example, Automated Optical Inspection (AOI) equipment can be used to detect Mura defects, laser repair equipment can be used to repair electrical defects, and DeMura compensation devices can compensate for uneven brightness through algorithms. However, these devices have relatively limited functions. The detection equipment can only complete defect identification and classification, but cannot perform repair. Laser repair is mainly for electrical defects such as short circuits / open circuits, and it is powerless against uneven cell thickness caused by mechanical stress. DeMura compensation is a software-level brightness correction and cannot fundamentally eliminate physical causes such as frame compression stress and moisture intrusion. The structural improvement scheme for the backlight module is only applicable to the new product design stage and cannot repair displays that have already been manufactured or are in use. In summary, the existing equipment has failed to integrate the three repair methods of stress relief, optical supplementation, and electrical performance stabilization into one, and cannot coordinate the multiple causes of black corner defects. Based on this, the present invention provides an LCM display screen black corner repair device to solve the problems mentioned in the background art. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing an LCM display screen black corner repair device. This solves the problem that existing devices fail to integrate stress relief, optical supplementation, and electrical performance stabilization into one repair method, and are unable to address the multiple causes of black corner defects in a coordinated manner.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: An LCM display screen black corner repair device, including a frame, and further comprising: The testing bracket is movable on the frame in three axes. A rotary frame is rotatably mounted on the testing bracket and a rotary motor is fixedly mounted on it. The output shaft of the rotary motor is fixedly connected to the rotary frame. A supplementary light, a hot air blower, a pressure rod, a CCD camera, a rotary motor and a laser rangefinder are fixedly mounted in sequence along the outer periphery of the rotary frame. The end of the pressure rod is provided with a pressure head, and a pressure sensor is provided between the pressure head and the pressure rod. A rotating frame is fixedly mounted on the output shaft of the rotary motor. The rotating frame is provided with two adjustable first support clamps. LED supplementary light side arrays are installed on the sides of the two first support clamps. A conveyor rail frame is fixedly mounted on the machine frame. A first linear transmission module is fixedly mounted on the conveyor rail frame and a traveling frame is slidably mounted on it. An axial vibrating frame is slidably connected to the conveyor rail frame, and a longitudinal vibrating frame is slidably connected to the axial vibrating frame. A carrier frame is fixedly mounted on the longitudinal vibrating frame. Each of the four corners of the carrier frame is provided with a clamping unit. The clamping unit includes a clamping platform slidably mounted on the carrier frame. A clamping push rod is installed between the clamping platform and the carrier frame. A clamp is slidably mounted on the carrier frame, and two tension sensors are installed between the clamp and the carrier frame. A second support clamp is slidably mounted on the clamp and an adjusting screw is rotatably mounted on it. The adjusting screw is drivenly connected to the second support clamp. A bidirectional drive mechanism is used to synchronously drive the axial vibrating frame to reciprocate in the vertical direction and drive the longitudinal vibrating frame to reciprocate in the horizontal direction, and to synchronously adjust the reciprocating stroke of the axial and longitudinal vibrating frames.

[0005] Based on the above technical solution, the present invention can be further improved as follows.

[0006] Optionally, a three-axis drive platform and a central control unit are fixedly installed on the frame. The three-axis drive platform is connected to the detection bracket. An audible and visual alarm is fixedly installed on the detection bracket. A three-axis accelerometer is fixedly installed on the longitudinal vibration frame. The data terminals of the three-axis accelerometer, pressure sensor, tension sensor, and audible and visual alarm are all communicatively connected to the central control unit.

[0007] Optionally, a dual-head motor is fixedly mounted on the rotating frame, and a transmission screw is fixedly installed on each of the two output shaft ends of the dual-head motor. The two transmission screws are respectively connected to two first support clamps, and the two first support clamps are slidably connected to the rotating frame. The axis of the transmission screw is perpendicular to the rotation axis of the rotating frame.

[0008] Optionally, the bidirectional drive mechanism includes a servo motor fixed on the walking frame, a second linear transmission module, and two horizontal shafts rotatably mounted on the walking frame. A first synchronous belt is drivenly connected to the output shaft of the servo motor, and both horizontal shafts are drivenly connected to the first synchronous belt. An adjusting bracket is drivenly mounted on the second linear transmission module, and two long-stroke cams are rotatably mounted on the adjusting bracket. The two long-stroke cams are slidably connected to the two horizontal shafts respectively. Two rollers are rotatably mounted on the axial vibrating frame, and the outer wheel surfaces of the two rollers abut against the outer peripheral surfaces of the two long-stroke cams respectively. A synchronization unit is installed between the axial vibrating frame and the longitudinal vibrating frame, and an axial spring is installed between the axial vibrating frame and the walking frame.

[0009] Optionally, the long-stroke cam has a through hole at its axial position that is slidably connected to the flat shaft. The cross-section of the through hole and the flat shaft are both regular hexagonal. The axial length of the long-stroke cam is 5 times the axial width of the roller. The long-stroke cam includes interconnected circular segments and a cam lift segment fixed on the circular segments. The radial protrusion height of the cam lift segment increases linearly along the axial direction.

[0010] Optionally, the synchronization unit includes a drive shaft rotatably mounted on a traveling frame, a drive gear mounted on the drive shaft, a drive gear plate fixedly mounted on the axial vibrating frame, the drive gear plate meshing with the drive gear, a driven shaft rotatably mounted on the axial vibrating frame, a second synchronous belt being driven between the drive shaft and the driven shaft, a tensioning unit for tensioning the second synchronous belt rotatably mounted on the axial vibrating frame, a driven gear fixedly mounted on the driven shaft, a driven gear plate rotatably mounted on the longitudinal vibrating frame, the driven gear meshing with the driven gear plate, and a longitudinal spring installed between the longitudinal vibrating frame and the axial vibrating frame.

[0011] Optionally, the tensioning unit includes a tensioning slide that is slidably mounted on an axial vibrating frame, a tensioning spring that is mounted on the side of the tensioning slide, a tensioning guide wheel that is rotatably mounted on the tensioning slide, and the tensioning guide wheel that is connected to a second synchronous belt drive.

[0012] Optionally, a support platform is fixedly mounted at the center of the frame, and a display module is detachably mounted on the support platform. A constant current power supply module is fixedly mounted on the frame, and the constant current power supply module is provided with a power supply socket for connecting to the display module.

[0013] Optionally, the pressure head is made of silicone, and the end of the pressure head has a hemispherical structure.

[0014] The beneficial effects of this invention are: 1. This invention constructs a three-in-one collaborative processing architecture integrating stress relief, optical supplementation, and electrical performance stabilization. By integrating multifunctional components such as supplementary lighting, hot air blower, pressure rod, CCD camera, and adjustable support clamps into the same rotating frame, and using a three-axis drive platform to achieve precise workstation switching, the device can sequentially complete defect detection, hot air dehumidification, frame support stress relief, and local pressure correction operations in a single clamping process. This avoids the accuracy loss caused by repeated positioning and transfer between multiple devices, significantly improving the continuity and consistency of the repair process. The bidirectional drive mechanism synchronously drives the axial and longitudinal vibration frames through a single servo motor, generating composite vibrations in the vertical and horizontal directions, fully exposing the mechanical stress state of the corner areas. This, combined with the CCD camera, enables dynamic capture of hidden breaks and intermittent black corners, compensating for the shortcomings of static detection which is prone to missed detections, and providing more comprehensive data support for subsequent differentiated repair strategies.

[0015] 2. This invention effectively integrates multi-source sensor information at the dynamic detection and closed-loop control level. Pressure sensors, tension sensors, and triaxial accelerometers provide real-time feedback of force signals and vibration parameters. The central control unit independently matches the clamping and expansion stroke and hot air duration according to the defect level of each corner, forming a differentiated stress release scheme for different corners. This effectively avoids the risk of secondary fluctuations in box thickness caused by uniform force application in traditional equipment. The constant current power supply module ensures stable brightness of the display module throughout the detection process. The visual re-inspection mechanism quantifies and compares the repair results. The audible and visual alarms promptly alert corners that do not meet the standards to trigger secondary intervention, forming a closed-loop workflow of detection, repair, and verification. This design deeply integrates mechanical stress control, hot air dehumidification, and visual inspection, achieving multi-factor collaborative handling capabilities within a single device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an LCM display screen black corner repair device according to the present invention; Figure 2 This is a schematic diagram of the structure of the detection bracket and the audible and visual alarm of the present invention; Figure 3 This is a schematic diagram of the hot air blower and supplementary lighting of the present invention; Figure 4 This is a schematic diagram of the structure of the first support clamp of the present invention; Figure 5 This is a schematic diagram of the adjusting screw and the traveling frame of the present invention; Figure 6 This is a schematic diagram of the structure of the support platform and the frame of the present invention; Figure 7 This is a schematic diagram of the longitudinal and axial vibrating frames of the present invention; Figure 8 This is a schematic diagram of the tension spring of the present invention; Figure 9 This is a schematic diagram of the driven shaft and tensioning guide wheel of the present invention; Figure 10 This is a schematic diagram of the driven toothed plate and tensioning guide wheel of the present invention.

[0017] The attached diagram lists the components represented by each number as follows: 1. Frame; 2. Detection bracket; 3. Conveyor rail; 101. Three-axis drive platform; 102. Central control unit; 201. Rotary frame; 202. Rotary motor; 203. Supplementary light; 204. Hot air blower; 205. Pressure rod; 206. CCD camera; 207. Rotary motor; 208. Laser rangefinder; 209. Pressure head; 210. Pressure sensor; 211. Rotating frame; 212. First support clamp; 213. LED supplementary light side row; 214. Audible and visual alarm; 215. Dual-head motor; 216. Transmission screw; 301. First linear transmission module; 302. Walking frame; 303. Axial vibration frame; 304. Longitudinal vibration frame; 305. Carrier frame; 3 06. Clamping platform; 307. Clamping push rod; 308. Clamping clamp; 309. Tension sensor; 310. Second support clamp; 311. Adjusting lead screw; 312. Three-axis accelerometer; 313. Servo motor; 314. Second linear transmission module; 315. Flat shaft; 316. Adjusting bracket; 317. Long stroke cam; 318. Roller; 319. Axial spring; 320. Drive shaft; 321. Drive gear; 322. Drive gear plate; 323. Driven shaft; 324. Driven gear; 325. Driven gear plate; 326. Longitudinal spring; 327. Tensioning slide; 328. Tensioning spring; 329. Tensioning guide wheel; 330. Support platform; 331. Constant current power supply module. Detailed Implementation

[0018] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0019] The present invention provides the following preferred embodiments. like Figure 1-10 As shown, an LCM display screen black corner repair device includes a frame 1, and further includes: The testing bracket 2 is movable on the frame 1 in three axes; Specifically, a three-axis drive platform 101 and a central control unit 102 are fixedly installed on the frame 1, and the three-axis drive platform 101 is connected to the detection bracket 2 in a transmission manner. A rotating frame 201 is rotatably mounted on the detection bracket 2 via bearings, and a rotating motor 202 is fixedly mounted thereon. The output shaft end of the rotating motor 202 is fixedly connected to the rotating frame 201. A supplementary light 203, a hot air blower 204, a pressure rod 205, a CCD camera 206, a rotary motor 207, and a laser rangefinder 208 are sequentially fixedly mounted on the outer periphery of the rotating frame 201. A pressure head 209 is provided at the end of the pressure rod 205, and a pressure sensor 210 is provided between the pressure head 209 and the pressure rod 205. The pressure head 209 is made of silicone, and the end of the pressure head 209 has a hemispherical structure. The axial distance between the supplementary light 203, hot air blower 204, pressure rod 205, CCD camera 206, rotary motor 207 and laser rangefinder 208 is perpendicular to the rotation axis of the rotating frame 201, and the air outlet port of the hot air blower 204 is fixedly connected to the air outlet nozzle. A rotating frame 211 is fixedly mounted on the output shaft of the rotary motor 207. The rotating frame 211 is provided with two first support clamps 212 with adjustable spacing. LED supplementary light side row 213 is installed on the side of each of the two first support clamps 212. In this embodiment, a dual-head motor 215 is fixedly mounted on the rotating frame 211. A transmission screw 216 is fixedly mounted on each of the two output shaft ends of the dual-head motor 215. The two transmission screws 216 are respectively connected to the two first support clamps 212. The two first support clamps 212 are slidably connected to the rotating frame 211. The axis of the transmission screw 216 is perpendicular to the rotation axis of the rotating frame 201. During the repair operation, the three-axis drive platform 101 drives the inspection bracket 2 to move to the upper edge of the black corner of the display screen, and the rotary motor 202 drives the rotary frame 201 to rotate and switch the work position, aligning the first support clamp 212 with the target edge. The dual-head motor 215 drives the two first support clamps 212 to adjust to the appropriate spacing through the transmission screw 216, and then extends into the inside of the display screen frame and expands slightly outward to apply a controllable support force to the frame to release the compressive stress. The rotary motor 207 can drive the rotating frame 211 to deflect, adjust the working angle of the support clamp, and adapt to the contour shape of different corners. When switching to the pressure contact process, the rotating frame 201 rotates the pressure contact rod 205 to the working position, and the pressure sensor 210 collects the contact pressure of the pressure head 209 in real time. When switching to the hot air process, the hot air blower 204 can output hot air to perform constant temperature heating and dehumidification treatment on the local area. The CCD camera 206 and the laser rangefinder 208 perform imaging detection and distance calibration, respectively. The above structure integrates multiple sets of detection and repair functional components on the outer periphery of the rotary frame 201. The station conversion of different processes can be completed by rotary switching, which simplifies the configuration of the multi-axis displacement mechanism. The first support clamp 212, together with the dual-head motor 215, can achieve precise adjustment of the spacing, adapting to the inner frame support operation of display modules of different sizes. Combined with the angle adjustment of the rotary motor 207, stress can be released at different positions of the corners, improving the problem of uneven box thickness caused by frame compression. The pressure sensor 210 can provide real-time feedback on the pressure applied, reducing the risk of damage to the display module due to pressure. The multi-station integrated design helps improve the efficiency of single-corner repair work. A conveyor rail frame 3 is fixedly mounted on the frame 1. A first linear transmission module 301 is fixedly mounted on the conveyor rail frame 3 and a traveling frame 302 is slidably mounted on it. An axial vibrating frame 303 is slidably connected to the conveyor rail frame 3. A longitudinal vibrating frame 304 is slidably connected to the axial vibrating frame 303. A carrier frame 305 is fixedly mounted on the longitudinal vibrating frame 304. A support platform 330 is fixedly mounted at the center of the carrier frame 305. A display screen module is detachably mounted on the support platform 330. A constant current power supply module 331 is fixedly mounted on the carrier frame 305. The constant current power supply module 331 is provided with a power supply socket for connecting to the display screen module. The four corners of the frame 305 are provided with clamping units; The clamping unit includes a clamping platform 306 slidably mounted on a carrier frame 305, a clamping push rod 307 installed between the clamping platform 306 and the carrier frame 305, a clamp 308 slidably mounted on the carrier frame 305, and two tension sensors 309 installed between the clamp 308 and the carrier frame 305. A second support clamp 310 is slidably mounted on the clamp 308 and an adjusting screw 311 is rotatably mounted on it. The adjusting screw 311 is connected to the second support clamp 310 in a transmission connection. Both the first clamp 212 and the second clamp 310 have an L-shaped structure; During the feeding stage, the first linear transmission module 301 drives the walking frame 302 to move along the conveyor rail frame 3 to the feeding station, and the operator places the display module on the support platform 330 to complete the initial positioning. The four corner clamping push rods 307 push the clamping platform 306 to move towards the display module. The clamp 308 feeds synchronously with the clamping platform 306. By rotating the adjusting screw 311, the extension length of the second support clamp 310 is adjusted so that the second support clamp 310 is inserted into the inner side of the display module frame, and works with the clamping platform 306 to complete the clamping and fixing of the corners. Two tension sensors 309 collect clamping force data in real time and feed it back to the central control unit 102 to regulate the feed amount of the clamping push rod 307; The constant current power supply module 331 is connected to the display module through the power supply socket, and continuously provides a stable power supply to keep the display module lit. The traveling frame 302 then moves the carrier frame 305 to the inspection and repair station to carry out subsequent operations; The four independent corner clamping units can respectively position and constrain the four corners of the display module. The clamping force is monitored in a closed loop by the tension sensor 309, which can control the clamping force within a reasonable range and reduce the impact of clamping deformation on the display effect of the display module. The telescopic adjustable design of the second support clamp 310 can adapt to display modules with different bezel widths and thicknesses, improving the size compatibility of the device. Constant current power supply can ensure stable brightness of the display module during the inspection and repair process, making it easier for the vision system to accurately identify the state of black corner defects. The linear conveying mode of the conveyor rail 3 can realize the orderly flow of the loading station and the operation station. An audible and visual alarm 214 is fixedly installed on the detection bracket 2, and a triaxial acceleration sensor 312 is fixedly installed on the longitudinal vibration frame 304. The data terminals of the triaxial acceleration sensor 312, pressure sensor 210, tension sensor 309 and audible and visual alarm 214 are all connected to the central control unit 102. During testing, the display module is kept under constant power. The CCD camera 206 first performs CCD visual inspection on the display module to detect the black corner position. After the initial black corner position detection, the axial vibrating frame 303 and the longitudinal vibrating frame 304 move back and forth synchronously to form bidirectional vibration frequency and amplitude and fully expose the black corner defect and disconnection phenomenon. The vibration frequency and amplitude of the axial vibrating frame 303 and the longitudinal vibrating frame 304 increase linearly. When the axial vibrating frame 303 and the longitudinal vibrating frame 304 move, the CCD camera 206 performs imaging inspection on the display module. After the black corner repair process is completed, the axial vibrating frame 303 and the longitudinal vibrating frame 304 move again and repeat the inspection. After the display module is positioned, the CCD camera 206 first performs static imaging detection on the illuminated display module to identify the position of the black corners. Meanwhile, the central control unit 102 calculates the difference between the gray value of the black corner area and the gray value of the standard white field based on the image data collected by the CCD camera 206, and classifies the defect level into three levels: mild, moderate and severe according to the size of the difference. Subsequently, the bidirectional drive mechanism drives the axial vibrating frame 303 and the longitudinal vibrating frame 304 to perform bidirectional reciprocating vibration, causing the display module to generate a composite vibration of axial and longitudinal directions. The triaxial accelerometer 312 collects vibration acceleration, frequency and amplitude data in real time and transmits them to the central control unit 102. During the vibration process, the vibration frequency and amplitude gradually increase linearly. The CCD camera 206 simultaneously performs continuous imaging acquisition on the display module to capture the changing characteristics of the black corner and the hidden contact defects under the vibration state. After the repair process is completed, the vibration frame is reset and the vibration stops. The CCD camera 206 performs a re-inspection. If the defect improvement does not meet the preset standard, the audible and visual alarm 214 will issue a prompt, which can trigger a secondary repair process. By simulating the working conditions of the display module under external force through bidirectional composite vibration, potential hidden defects such as poor contact and intermittent black corners can be fully revealed, reducing the probability of missed detection in static testing. The linear increasing pattern of vibration frequency and amplitude can be used to classify and analyze the defect performance under different vibration intensities, thereby improving the comprehensiveness of defect judgment. The triaxial accelerometer 312 enables closed-loop feedback of vibration parameters, ensuring the controllability of vibration conditions. The linkage process of vibration detection and visual re-inspection can quantitatively verify the repair effect, and the audible and visual alarms can promptly alert non-conforming products and abnormal working conditions, making it easier for operators to intervene and handle them. A bidirectional drive mechanism is used to synchronously drive the axial vibrating frame 303 to reciprocate in the vertical direction and drive the longitudinal vibrating frame 304 to reciprocate in the horizontal direction, and to synchronously adjust the reciprocating stroke of the axial vibrating frame 303 and the longitudinal vibrating frame 304.

[0020] The bidirectional drive mechanism includes a servo motor 313 fixed on the walking frame 302, a second linear transmission module 314, and two flat shafts 315 rotatably mounted on the walking frame 302. A first synchronous belt is driven to the output shaft of the servo motor 313, and both flat shafts 315 are driven to the first synchronous belt. An adjusting bracket 316 is driven to the second linear transmission module 314. Two long-stroke cams 317 are rotatably mounted on the adjusting bracket 316. The two long-stroke cams 317 are slidably connected to the two flat shafts 315 respectively. Two rollers 318 are rotatably mounted on the axial vibrating frame 303. The outer wheel surfaces of the two rollers 318 abut against the outer peripheral surfaces of the two long-stroke cams 317 respectively. A synchronization unit is installed between the axial vibrating frame 303 and the longitudinal vibrating frame 304. An axial spring 319 is installed between the axial vibrating frame 303 and the walking frame 302.

[0021] The long-stroke cam 317 has a through hole at its axial position that is slidably connected to the flat shaft 315. The cross-section of the through hole and the flat shaft 315 are both regular hexagonal. The axial length of the long-stroke cam 317 is 5 times the axial width of the roller 318. The long-stroke cam 317 includes interconnected circular segments and a cam lift segment fixed on the circular segments. The radial convex height of the cam lift segment increases linearly along the axial direction.

[0022] The synchronization unit includes a drive shaft 320 rotatably mounted on the traveling frame 302, a drive gear 321 mounted on the drive shaft 320, a drive gear plate 322 fixedly mounted on the axial vibrating frame 303, the drive gear plate 322 meshing with the drive gear 321, a driven shaft 323 rotatably mounted on the axial vibrating frame 303, a second synchronous belt being driven between the drive shaft 320 and the driven shaft 323, a tensioning unit for tensioning the second synchronous belt being rotatably mounted on the axial vibrating frame 303, a driven gear 324 fixedly mounted on the driven shaft 323, a driven gear plate 325 rotatably mounted on the longitudinal vibrating frame 304, the driven gear 324 meshing with the driven gear plate 325, and a longitudinal spring 326 being installed between the longitudinal vibrating frame 304 and the axial vibrating frame 303.

[0023] When the drive is running, the servo motor 313 drives the two flat shafts 315 to rotate synchronously through the first synchronous belt. The flat shafts 315 drive the long stroke cam 317 to rotate synchronously. The outer circumferential surface of the long stroke cam 317 pushes against the roller 318. With the rebound effect of the axial spring 319, the axial vibrating frame 303 is driven to reciprocate in the vertical direction. During the lifting and lowering of the axial vibrating frame 303, the transmission tooth plate 322 drives the transmission gear 321 and the transmission shaft 320 to rotate. The power is transmitted to the driven shaft 323 and the driven gear 324 via the second synchronous belt. The driven gear 324 meshes and drives the driven tooth plate 325, which drives the longitudinal vibrating frame 304 to reciprocate in the horizontal direction. When the vibration stroke needs to be adjusted, the second linear transmission module 314 drives the adjustment bracket 316 to move axially along the flat shaft 315, which in turn drives the long stroke cam 317 to slide along the flat shaft 315, so that the roller 318 corresponds to different axial positions of the long stroke cam 317. As the radial convex height of the cam lift section changes linearly, the axial and longitudinal reciprocating strokes are changed synchronously. The above structure uses a single servo motor 313 as a power source. Through the linkage transmission between the long stroke cam 317 and the synchronization unit, it can synchronously output reciprocating vibrations in both vertical and horizontal directions. The axial sliding adjustment method of the long stroke cam 317 can linearly adjust the vibration stroke in two directions to adapt to different vibration detection and repair needs; The hexagonal flat shaft 315, in conjunction with the through hole, ensures stable torque transmission while the long-stroke cam 317 slides axially. The axial spring 319 and the longitudinal spring 326 maintain the contact between the roller 318 and the cam surface, buffering the rigid impact during vibration and improving the smoothness of vibration operation. The tensioning unit includes a tensioning slide 327 slidably mounted on an axial vibrating frame 303, a tensioning spring 328 mounted on the side of the tensioning slide 327, and a tensioning guide wheel 329 rotatably mounted on the tensioning slide 327. The tensioning guide wheel 329 is connected to a second synchronous belt drive.

[0024] When the axial vibrating frame 303 reciprocates in the vertical direction, the center distance between the drive shaft 320 and the driven shaft 323 changes with the position of the vibrating frame, causing fluctuations in the slack side length of the second synchronous belt. The tension spring 328 continuously applies a thrust to the tension slide 327, causing the tension slide 327 to slide along the guide rail of the axial vibrating frame 303, which in turn drives the tension guide wheel 329 to always press against the slack side of the second synchronous belt, automatically compensating for the slack of the second synchronous belt and maintaining the tension of the second synchronous belt.

[0025] The specific steps for using this invention are as follows: After the device starts and completes initialization, the first linear transmission module 301 drives the walking frame 302 to move along the conveyor rail 3 to the loading station. The operator places the display module to be repaired on the support platform 330 in the center of the frame 305 to complete the initial positioning. The constant current power supply module 331 is connected to the display module through the power supply socket to provide a stable constant current power supply so that the display module keeps the white field lit. Subsequently, the four corner clamping push rods 307 are activated simultaneously, pushing the clamping platform 306 to drive the clamps 308 to feed towards the corners of the display module. The second support clamp 310, whose extension length has been pre-adjusted by the adjusting screw 311, is inserted into the inner side of the display module frame. Two tension sensors 309 set between each set of clamps 308 and the carrier frame 305 collect clamping tension data in real time and transmit it to the central control unit 102. When the tension reaches the preset clamping threshold, the clamping push rods 307 stop feeding, completing the four corner positioning and clamping of the display module. After clamping, the first linear transmission module 301 drives the walking frame 302 to move the carrier frame 305 and the display module to the inspection and repair station. The three-axis drive platform 101 drives the inspection bracket 2 to move directly above the display module. After the laser ranging probe 208 completes the working distance calibration, the rotary motor 202 drives the rotary frame 201 to rotate the CCD camera 206 to the working position. The supplementary light 203 and the LED supplementary light side column 213 provide auxiliary lighting. The CCD camera 206 performs static visual acquisition of the entire display module and identifies the location distribution of black corners and the initial defect level. The central control unit 102 matches the corresponding repair parameters based on the detection results; After the static test is completed, the dynamic vibration test begins. The servo motor 313 of the bidirectional drive mechanism starts and drives the two flat shafts 315 to rotate synchronously through the first synchronous belt. The flat shafts 315 drive the long stroke cam 317 to rotate synchronously. The outer circumferential surface of the long stroke cam 317 pushes against the roller 318, and with the rebound effect of the axial spring 319, the axial vibrating frame 303 reciprocates in the vertical direction. At the same time, the transmission toothed plate 322 on the axial vibrating frame 303 meshes with the transmission gear 321 on the traveling frame 302, and the power is transmitted to the driven gear 324 through the transmission shaft 320, the second synchronous belt, and the driven shaft 323. The driven gear 324 meshes and drives the driven toothed plate 325 to drive the longitudinal vibrating frame 304 to reciprocate in the horizontal direction, so that the display module generates a vertical and horizontal bidirectional composite vibration. During the vibration process, the vibration frequency and amplitude increase linearly. The triaxial accelerometer 312 on the longitudinal vibration frame 304 collects vibration acceleration, frequency and amplitude data in real time and forms a closed-loop feedback. The CCD camera 206 simultaneously performs continuous imaging acquisition on the display module to capture the performance characteristics of hidden disconnection and intermittent black corner under vibration, and supplements and improves the defect judgment results. If the vibration stroke needs to be adjusted, the second linear transmission module 314 can drive the adjustment bracket 316 to drive the long stroke cam 317 to slide axially along the flat shaft 315, so that the roller 318 corresponds to different axial positions of the long stroke cam 317. The stroke of the bidirectional vibration is synchronously adjusted by the linear change of the radial convex height of the cam lift section. During the process, the tensioning slide 327 of the tensioning unit drives the tensioning guide wheel 329 to continuously press against the second synchronous belt under the action of the tensioning spring 328, automatically compensating for the slack of the synchronous belt caused by the lifting and lowering of the axial vibration frame 303, and ensuring the transmission synchronization and operation stability. After the defect is determined, the repair stage begins. First, the four corner stress release process is performed. The central control unit 102 matches the corresponding expansion stroke and target support force parameters for the clamping push rods 307 at the four corners according to the black corner defect level of each corner. Four sets of clamping push rods 307 are fed independently, pushing the corresponding clamping platform 306 and the second support clamp 310 to move slightly outward of the frame, applying outward supporting force to the frame to release the internal stress formed by long-term compression. Each set of tension sensors 309 constitutes an independent force control feedback path. After the tension value of a single set reaches the corresponding preset threshold, the corner clamping push rod 307 stops feeding and enters a constant force holding state. Each corner can achieve differentiated stress release control according to the degree of defect. During the pressure holding process, the rotary motor 202 drives the rotary frame 201 to switch the hot air blower 204 station, and the three-axis drive platform 101 drives the detection bracket 2 to move sequentially to the four corners. The hot air blower 204 delivers 45°C constant temperature hot air to the corner area through the air outlet nozzle, which, in conjunction with the stress release process, accelerates the local water vapor evaporation and improves the electrical characteristic drift caused by water vapor intrusion. After a 5-second pressure holding time, the four sets of clamping push rods 307 retract and reset synchronously at a uniform rate to avoid secondary fluctuations caused by sudden changes in the force on the frame. For a single corner with a deep defect, the rotating frame 201 can be switched to the station of the rotary motor 207. The dual-head motor 215 drives the two first support clamps 212 to adjust to the appropriate spacing and then extend into the inside of the frame. The rotary motor 207 drives the rotating frame 211 to deflect and adjust the support angle, so as to provide fine supplementary support for the local area and further release the stress of the corner. Then, the rotating frame 201 switches the pressure bar 205 to the work position, the three-axis drive platform 101 drives the detection bracket 2 to accurately align the black corner area, the silicone hemispherical pressure head 209 performs flexible pressure correction on the local area, and the pressure sensor 210 built into the pressure bar 205 collects the pressure in real time to control the pressure amount within a safe range. After all repair procedures are completed, the device is restarted with bidirectional vibration detection and static visual inspection to compare the brightness and distribution of the black corners before and after repair and verify the repair effect. If the test results meet the qualified standard, the walking frame 302 drives the carrier frame 305 back to the loading station, the clamping push rod 307 retracts to release the clamping, and the qualified product is discharged. If the repair effect of some corners is not as expected, the central control unit 102 will automatically adjust the repair parameters and perform a secondary repair process on the corresponding corners. If the test fails to meet the standard after multiple repairs, the audible and visual alarm 214 on the test bracket 2 will issue a prompt, and the operator will intervene to conduct a manual review.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A black corner repair device for an LCM display screen, comprising a frame, characterized in that, Also includes: The testing bracket is movable on the frame in three axes. A rotary frame is rotatably mounted on the testing bracket and a rotary motor is fixedly mounted on it. The output shaft of the rotary motor is fixedly connected to the rotary frame. A supplementary light, a hot air blower, a pressure rod, a CCD camera, a rotary motor and a laser rangefinder are fixedly mounted in sequence along the outer periphery of the rotary frame. The end of the pressure rod is provided with a pressure head, and a pressure sensor is provided between the pressure head and the pressure rod. A rotating frame is fixedly mounted on the output shaft of the rotary motor. The rotating frame is provided with two adjustable first support clamps. LED supplementary light side arrays are installed on the sides of the two first support clamps. A conveyor rail frame is fixedly mounted on the machine frame. A first linear transmission module is fixedly mounted on the conveyor rail frame and a traveling frame is slidably mounted on it. An axial vibrating frame is slidably connected to the conveyor rail frame, and a longitudinal vibrating frame is slidably connected to the axial vibrating frame. A carrier frame is fixedly mounted on the longitudinal vibrating frame. Each of the four corners of the carrier frame is provided with a clamping unit. The clamping unit includes a clamping platform slidably mounted on the carrier frame. A clamping push rod is installed between the clamping platform and the carrier frame. A clamp is slidably mounted on the carrier frame, and two tension sensors are installed between the clamp and the carrier frame. A second support clamp is slidably mounted on the clamp and an adjusting screw is rotatably mounted on it. The adjusting screw is drivenly connected to the second support clamp. A bidirectional drive mechanism is used to synchronously drive the axial vibrating frame to reciprocate in the vertical direction and drive the longitudinal vibrating frame to reciprocate in the horizontal direction, and to synchronously adjust the reciprocating stroke of the axial and longitudinal vibrating frames.

2. The LCM display screen black corner repair device according to claim 1, characterized in that, A three-axis drive platform and a central control unit are fixedly installed on the frame. The three-axis drive platform is connected to the detection bracket. An audible and visual alarm is fixedly installed on the detection bracket. A three-axis accelerometer is fixedly installed on the longitudinal vibration frame. The data terminals of the three-axis accelerometer, pressure sensor, tension sensor, and audible and visual alarm are all connected to the central control unit.

3. The LCM display screen black corner repair device according to claim 1, characterized in that, A dual-head motor is fixedly mounted on the rotating frame. A transmission screw is fixedly installed on each of the two output shaft ends of the dual-head motor. The two transmission screws are respectively connected to two first support clamps. The two first support clamps are slidably connected to the rotating frame. The axis of the transmission screw is perpendicular to the rotation axis of the rotating frame.

4. The LCM display screen black corner repair device according to claim 1, characterized in that, The bidirectional drive mechanism includes a servo motor fixed on the walking frame, a second linear transmission module, and two horizontal shafts rotatably mounted on the walking frame. A first synchronous belt is driven to the output shaft of the servo motor, and both horizontal shafts are driven to the first synchronous belt. An adjustment bracket is driven to the second linear transmission module, and two long-stroke cams are rotatably mounted on the adjustment bracket. The two long-stroke cams are slidably connected to the two horizontal shafts respectively. Two rollers are rotatably mounted on the axial vibrating frame, and the outer wheel surfaces of the two rollers abut against the outer peripheral surfaces of the two long-stroke cams respectively. A synchronization unit is installed between the axial vibrating frame and the longitudinal vibrating frame, and an axial spring is installed between the axial vibrating frame and the walking frame.

5. The LCM display screen black corner repair device according to claim 4, characterized in that, The long-stroke cam has a through hole at its axial position that is slidably connected to the flat shaft. The cross-section of the through hole and the flat shaft are both regular hexagonal. The axial length of the long-stroke cam is 5 times the axial width of the roller. The long-stroke cam includes interconnected circular segments and a cam lift segment fixed on the circular segments. The radial convex height of the cam lift segment increases linearly along the axial direction.

6. The LCM display screen black corner repair device according to claim 1, characterized in that, The synchronization unit includes a drive shaft rotatably mounted on a traveling frame, a drive gear mounted on the drive shaft, a drive gear plate fixedly mounted on the axial vibrating frame, the drive gear plate meshing with the drive gear, a driven shaft rotatably mounted on the axial vibrating frame, a second synchronous belt being driven between the drive shaft and the driven shaft, a tensioning unit for tensioning the second synchronous belt rotatably mounted on the axial vibrating frame, a driven gear fixedly mounted on the driven shaft, a driven gear plate rotatably mounted on the longitudinal vibrating frame, the driven gear meshing with the driven gear plate, and a longitudinal spring installed between the longitudinal vibrating frame and the axial vibrating frame.

7. The LCM display screen black corner repair device according to claim 6, characterized in that, The tensioning unit includes a tensioning slide that is slidably mounted on an axial vibrating frame. A tensioning spring is mounted on the side of the tensioning slide, and a tensioning guide wheel is rotatably mounted on the tensioning slide. The tensioning guide wheel is connected to a second synchronous belt drive.

8. The LCM display screen black corner repair device according to claim 1, characterized in that, A support platform is fixedly installed at the center of the frame, and a display module is detachably installed on the support platform. A constant current power supply module is fixedly installed on the frame, and the constant current power supply module is provided with a power supply socket for connecting to the display module.

9. The LCM display screen black corner repair device according to claim 1, characterized in that, The pressure head is made of silicone, and the end of the pressure head has a hemispherical structure.

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