Liquid crystal display screen backlight module quality detection device and detection method

Abstract

The invention relates to the technical field of backlight module detection, in particular to a liquid crystal display screen backlight module quality detection device and method, and the liquid crystal display screen backlight module quality detection method comprises the following steps: S1, backlight assembly feeding and clamping, S2, integrated plugging detection, S3, vibration beating, S4, regional pressing and S5, sorting and storage. The detection device used in the backlight module detection method comprises the top plate, the middle of the top of the top plate is fixedly connected with the detection table, plugs of a plurality of backlight modules are plugged at the same time through the arrangement of the positioning plugging mechanism, simultaneous positioning clamping of the backlight modules is achieved through the positioning clamping mechanism, and the detection efficiency is improved. The mode that side edge clamping is matched with top pressing connection is adopted for fixing, the clamping stability is good, beating vibration is conducted on the bottom of the detection table through the beating vibration mechanism, multi-point pressing is conducted on the backlight module through the multi-point pressing mechanism, and the backlight module can be conveniently detected under different working conditions.

Description

Technical Field

[0001] The present invention belongs to the technical field of backlight module detection, and particularly relates to a quality detection device and a detection method for a backlight module of a liquid crystal display screen. Background Art

[0002] The backlight module of a liquid crystal display screen is an important component for providing light sources so that the liquid crystal screen can display images in an environment with insufficient light. Since the liquid crystal panel itself does not emit light, a backlight module is required to illuminate the screen. The backlight module of a liquid crystal display screen includes a light source, a light guide plate, a reflector, a diffusion plate, a brightness enhancement film, a frame, and a control circuit board. As Figure 9 shown, when the backlight module leaves the factory, quality inspection is required. The quality inspection includes items such as optical performance inspection, reliability inspection, safety inspection, and appearance inspection. During the inspection, a CCD image sensor is used to take pictures of the backlight component for inspection, and the taken pictures are compared with the backlight components that are normally used in the database to check for scratches, foreign objects, white spots, light leakage, etc. The following problems exist when performing quality inspection on the backlight module of a liquid crystal display screen: 1. When performing optical performance inspection on the backlight module, usually the power plug is inserted into the socket on the circuit board of the backlight module to power on the backlight module, and a CCD image sensor is used to take pictures of the backlight component for inspection to check whether it is used normally and whether the brightness is normal. However, in the existing equipment during the inspection process, only a single backlight module can be inspected each time, and in order to test reliability and durability, manual plugging and unplugging tests are required multiple times, with high operation difficulty and low work efficiency; 2. When the backlight component is inspected, in addition to whether the optical performance is normal, during daily use of the backlight component, there may be situations of collision and vibration. When the solder joints of the backlight component are welded, there may be a situation of false soldering. During vibration, the false soldered solder joints may become loose, and when colliding and being pressed, the backlight component may be damaged. Therefore, it is necessary to test whether the equipment can ensure normal use under vibration and pressure conditions, and screen out and remove the backlight components with false soldering through vibration testing. However, the existing equipment usually can only perform single-item tests and it is difficult to test the usage conditions of the backlight component under vibration and pressure states, and different equipment needs to be replaced for testing, which is time-consuming and laborious.

[0003] 3. The sizes of the backlight components in different-sized display screens are different. Before testing, the backlight components need to be clamped and fixed. Usually, the methods of vacuum adsorption and customized fixture clamping are used for fixing. Different fixtures need to be customized for different-sized backlight components, with high costs, and the fixing stability of the vacuum adsorption method is relatively poor. Summary of the Invention

[0004] The object of the present invention is to provide a quality detection device and detection method for a backlight module of a liquid crystal display screen with a simple structure and reasonable design to solve the above problems.

[0005] The present invention achieves the above object through the following technical solutions: A quality detection device for a backlight module of a liquid crystal display screen, including a top plate. In the middle of the top of the top plate, a detection table is fixedly connected. A flapping and vibrating mechanism is arranged below the top plate. A positioning and clamping mechanism is arranged on the detection table. And a multi-point pressing mechanism is jointly arranged on the top plate and the detection table. A positioning and plugging mechanism is arranged at the rear side of the top of the top plate. A fixing frame is arranged in the middle of the rear side of the top plate. A CCD image sensor is arranged at the front side of the top of the fixing frame. A data connection is established between the CCD image sensor and the background processor; Two pads for supporting the backlight module are symmetrically and fixedly arranged at the front and rear of the top of the detection table. The positioning and plugging mechanism includes a mounting seat fixedly connected to the rear side of the top of the top plate. A plurality of limit grooves for installing the plugs of the backlight module are evenly opened on the top of the mounting seat. And a cover plate for pressing and fixing the plugs is snap-connected on the mounting seat. Two electric slide rails are symmetrically and fixedly installed on the left and right sides of the rear side of the top of the top plate. Electric sliders are slidably connected to both of the two electric slide rails. A movable seat is fixedly connected to the tops of the two electric sliders. Sockets corresponding to the positions of the plugs one by one are fixedly connected to the movable seat.

[0006] Preferably, the positioning and clamping mechanism includes a limit groove opened in the middle of the top of the detection table. A bidirectional lead screw is rotatably connected inside the limit groove. A first servo motor is fixedly connected to the middle of the front side of the detection table. The output end of the first servo motor is fixedly connected to the front end of the bidirectional lead screw. Two second movable blocks are symmetrically thread-connected to the bidirectional lead screw through ball nuts. The second movable blocks are slidably connected inside the limit groove. Support plates are fixedly connected to the tops of the two second movable blocks. A plurality of fixing boxes are evenly arranged on the support plates. A top pressing component and a side clamping component are arranged on the fixing boxes. A delay contact switch is fixedly installed on the top of the fixing box located at the right rear side.

[0007] Preferably, the top pressing component includes a first rack movably penetrating through the top and bottom of the fixing box. A fixing rod is fixedly connected to the top of the first rack. A movable sleeve is slidably sleeved on the fixing rod. A connecting rod is fixedly connected to one side of the movable sleeve close to the detection table. The end of the connecting rod far from the fixing rod is fixedly connected to a top pressing block. A top buffer rubber block is fixedly installed at the bottom of the top pressing block. A locking screw is thread-connected to one side of the movable sleeve far from the detection table.

[0008] Preferably, the side clamping assembly includes two second mounting plates symmetrically and fixedly connected to the inside of the fixed box on the left and right. A fixed shaft is rotatably penetrated between the two second mounting plates. A second gear is fixedly sleeved in the middle of the fixed shaft. One end of the fixed shaft is fixedly sleeved with a first gear meshing with the first rack. A side clamping block is fixedly installed on one side of the fixed box close to the detection table. A side buffer rubber block is fixedly installed on the side clamping block. A second rack meshing with the second gear is movably penetrated through the lower part of the fixed box. The first rack and the second rack are vertically distributed at 90 degrees.

[0009] Preferably, a movable pin is fixedly installed at one end of the second rack close to the detection table. The movable pin slidably penetrates the centers of the side clamping block and the side buffer rubber block. A fixed block is fixedly installed on one side of the bottom of the second rack close to the movable pin. A second spring is fixedly installed between the fixed block and the inner wall of the fixed box.

[0010] Preferably, the flapping and vibrating mechanism includes two ear plates symmetrically and fixedly connected to the bottom of the top plate on the left and right. A transmission rod is rotatably connected between the two ear plates. Two fixed sleeves are symmetrically and fixedly installed on the transmission rod on the left and right. A plurality of rubber flapping plates are fixedly installed on the outer circumference of the fixed sleeves at equal intervals. A second servo motor is fixedly connected to the left ear plate. The output end of the second servo motor is fixedly connected to the left end of the transmission rod.

[0011] Preferably, the multi-point pressing mechanism includes a transverse movement assembly, a rubber pressing head, a first telescopic rod, a first mounting plate and a third servo motor. The transverse movement assembly is arranged on the detection table. Support legs are respectively and fixedly connected to the four corners of the bottom of the detection table.

[0012] Preferably, the transverse movement assembly includes four side plates fixedly connected to the four corners of the top of the detection table. The four side plates are divided into two groups in pairs and are symmetrically distributed on the left and right. A one-way lead screw is rotatably connected between the two side plates in the same group. The rear ends of the two one-way lead screws are connected by a belt drive. A first movable block is threadedly connected to the middle of the one-way lead screw through a ball nut. A first mounting plate is fixedly connected to the bottoms of the two first movable blocks. A plurality of first telescopic rods are evenly installed on the bottom of the first mounting plate. The bottom end of the output end of the first telescopic rod is fixedly installed with a rubber pressing head. A third servo motor is fixedly connected to the right side plate. The output end of the third servo motor is fixedly connected to the front end of the one-way lead screw on the right side.

[0013] Preferably, two limit blocks are symmetrically and fixedly installed on the left and right of each of the two first movable blocks. A guide rod slidably penetrates through the middle of the two limit blocks. Ear blocks are fixedly installed at both ends of the guide rod. The ear blocks are fixedly installed on the side plates.

[0014] A method for detecting the quality of a liquid crystal display backlight module, based on the above-mentioned liquid crystal display backlight module quality detection device, the method for detecting the quality of the liquid crystal display backlight module includes the following steps: S1. Loading and clamping of the backlight module: Place multiple backlight modules to be detected on the top of the backing plate in sequence, and then use the positioning and clamping mechanism to perform side clamping and top crimping to stably position and clamp the backlight modules.

[0015] S2. Integrated plugging and unplugging detection: Use the positioning plugging and unplugging mechanism to synchronously power on and off the plugs of multiple backlight modules. After power on, use a CCD image sensor to take pictures and compare them with the normal backlight modules stored in the database to check for scratches, foreign objects, white spots, light leakage, etc. If no differences are found, it indicates that the backlight module is qualified; if any of the above phenomena exist, it indicates that it is unqualified.

[0016] S3. Vibration and patting: While ensuring power on, use the patting and vibrating mechanism to pat the bottom of the test bench. During the vibration and patting process, use a CCD image sensor to take pictures and compare them with the normal backlight modules stored in the database to detect whether the backlight module works properly under vibration conditions.

[0017] S4. Multi - point pressing by region: While vibrating and patting, use the multi - point pressing mechanism to perform multi - point pressing on the top of the backlight module. After pressing, use a CCD image sensor to take pictures and compare them with the normal backlight modules stored in the database to detect whether the backlight module works properly under the pressed condition.

[0018] S5. Sorting and storage: After the detection, sort and mark the qualified products and unqualified products. The qualified products enter the next process, and the unqualified products are sent back for repair.

[0019] The beneficial effects of the present invention are as follows: 1. Through the setting of the positioning plugging and unplugging mechanism, the present invention simultaneously plugs and unpluggs the plugs of multiple backlight modules, realizing the rapid power on and off of the backlight modules. When testing the durability, there is no need to manually plug and unplug one by one, improving the work efficiency.

[0020] 2. Through the positioning and clamping mechanism, the present invention realizes the simultaneous positioning and clamping of multiple backlight modules. During the clamping process, the side clamping is combined with the top crimping for fixation, with good clamping stability, avoiding slippage during testing, and being applicable to backlight modules of different sizes without the need to design special fixtures specifically, reducing the cost. 3. While keeping the power on, the present invention uses the patting and vibrating mechanism to pat and vibrate the bottom of the test bench, facilitating the testing of whether the solder joints will fall off and stroboscopic phenomena will occur in the backlight module under vibration conditions, thereby screening out the backlight modules that may have the above problems and ensuring the reliable quality of the backlight modules at the time of leaving the factory. By using the multi - point pressing mechanism to perform multi - point pressing on the top of the backlight module, it is convenient to test the usage of the backlight module under the pressed state, which is conducive to completing the testing of the backlight module under different working conditions on one device. Brief Description of the Drawings

[0021] Figure 1 is a three-dimensional view of the overall structure of the present invention; Figure 2 is a three-dimensional view of the top plate, positioning plug-in mechanism and positioning plug-in mechanism of the present invention; Figure 3 is a three-dimensional view of the top plate, positioning clamping mechanism and detection table of the present invention; Figure 4 is a three-dimensional view of the positioning clamping mechanism, detection table and delay contact switch of the present invention; Figure 5 is of the present invention Figure 4 enlarged schematic view of area A in; Figure 6 is a three-dimensional bottom view of the top plate and the flapping vibration mechanism of the present invention; Figure 7 is a front view of the top plate, flapping vibration mechanism and multi-point pressing mechanism of the present invention; Figure 8 is a three-dimensional view of the top plate, flapping vibration mechanism and multi-point pressing mechanism of the present invention; Figure 9 is a schematic view of the backlight assembly of the present invention; Figure 10 is a flowchart of the method of the present invention.

[0022] In the figure: 1. Top plate; 2. Support leg; 3. Multi-point pressing mechanism; 31. Transverse movement assembly; 311. Side plate; 312. Guide rod; 313. Limit block; 314. First movable block; 315. One-way lead screw; 316. Ear block; 32. Rubber pressing head; 33. First telescopic rod; 34. First mounting plate; 35. Third servo motor; 4. Positioning plug-in mechanism; 41. Cover plate; 42. Mounting seat; 43. Electric slider; 44. Socket; 45. Movable seat; 46. Electric slide rail; 5. Positioning clamping mechanism; 51. First servo motor; 52. Bidirectional lead screw; 53. Support plate; 54. Limit groove; 55. Second movable block; 56. Top pressing assembly; 561. Top buffer rubber block; 562. Top pressing block; 563. Connecting rod; 564. Fixed rod; 565. Locking screw; 566. Movable sleeve; 567. First rack; 568. First gear; 57. Fixed box; 58. Side clamping assembly; 581. Second rack; 582. Second gear; 583. Fixed shaft; 584. Second spring; 585. Side clamping block; 586. Side buffer rubber block; 587. Movable pin; 588. Second mounting plate; 6. Base plate; 7. Flapping vibration mechanism; 71. Ear plate; 72. Second servo motor; 73. Transmission rod; 74. Rubber flapping plate; 8. Detection table; 9. Fixed frame; 10. CCD image sensor; 11. Delay contact switch. Detailed implementation mode

[0023] The following further describes the present application in conjunction with the attached drawings. It is necessary to point out here that the following specific implementation modes are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0024] Example: Please refer to Figure 1 , a quality detection device for a liquid crystal display backlight module, including a top plate 1. A detection table 8 is fixedly connected to the middle of the top of the top plate 1. A slapping and vibrating mechanism 7 is arranged below the top plate 1. A positioning and clamping mechanism 5 for limiting, clamping and fixing the backlight module is arranged on the detection table 8. A multi-point pressing mechanism 3 for pressing and detecting the top of the backlight module is jointly arranged on the top plate 1 and the detection table 8. A positioning and plugging mechanism 4 is arranged at the rear side of the top of the top plate 1. A fixing frame 9 is arranged in the middle of the rear side of the top plate 1. A CCD image sensor 10 for photographing and collecting the backlight module is arranged at the front side of the top of the fixing frame 9. A data connection is established between the CCD image sensor 10 and the background processor. Two pads 6 for supporting the backlight module are symmetrically fixed at the front and rear of the top of the detection table 8.

[0025] During use, the slapping and vibrating mechanism 7 is used to slap and vibrate the bottom of the detection table 8. The positioning and clamping mechanism 5 is used to synchronously position, clamp and fix multiple backlight modules. The multi-point pressing mechanism 3 is used to perform equally spaced multi-point pressing tests on the top of the backlight component. The positioning and plugging mechanism 4 is used to perform plug and unplug tests on the plugs of multiple backlight components. The CCD image sensor 10 is used to photograph the state of the backlight module after testing and compare it with the normal backlight module in the database. If it is the same as the normal backlight module, it indicates qualified, otherwise it indicates unqualified. The comparison items include whether it emits light normally, whether there is light leakage, scratches, black dots, white dots and foreign objects.

[0026] Please refer to Figure 3 , the positioning and clamping mechanism 5 includes a limiting groove 54 opened in the middle of the top of the detection table 8. A bidirectional lead screw 52 is rotatably connected inside the limiting groove 54. The thread directions at both ends of the bidirectional lead screw 52 are opposite. A first servo motor 51 is fixedly connected to the middle of the front side of the detection table 8. The output end of the first servo motor 51 is fixedly connected to the front end of the bidirectional lead screw 52. Two second movable blocks 55 are symmetrically connected to the bidirectional lead screw 52 through ball nuts. The second movable blocks 55 are slidably connected inside the limiting groove 54. A supporting plate 53 is fixedly connected to the top of each of the two second movable blocks 55. A plurality of fixing boxes 57 are evenly arranged on the supporting plate 53. A top pressing component 56 and a side clamping component 58 are arranged on the fixing box 57. A delay contact switch 11 is fixedly installed on the top of the fixing box 57 located at the right rear side.

[0027] Please refer to Figure 3 、 Figure 4 and Figure 5 , the top crimping component 56 includes a first rack 567 that movably penetrates the top and bottom of the fixed box 57. A fixed rod 564 is fixedly connected to the top of the first rack 567. A movable sleeve 566 is slidably sleeved on the fixed rod 564. A connecting rod 563 is fixedly connected to one side of the movable sleeve 566 close to the detection table 8. One end of the connecting rod 563 away from the fixed rod 564 is fixedly connected to a top crimping block 562. A top buffer rubber block 561 is fixedly installed at the bottom of the top crimping block 562. A locking screw 565 is threadedly connected to the side of the movable sleeve 566 away from the detection table 8. One end of the locking screw 565 is pressed against the outside of the fixed rod 564, and the other end of the locking screw 565 is fixedly installed with a handle.

[0028] Please refer to Figure 3 、 Figure 4 and Figure 5 , the side clamping component 58 includes two second mounting plates 588 fixedly connected symmetrically left and right inside the fixed box 57. A fixed shaft 583 rotatably penetrates between the two second mounting plates 588. A second gear 582 is fixedly sleeved in the middle of the fixed shaft 583. One end of the fixed shaft 583 is fixedly sleeved with a first gear 568 that meshes with the first rack 567. A side clamping block 585 is fixedly installed on the side of the fixed box 57 close to the detection table 8. A side buffer rubber block 586 is fixedly installed on the side clamping block 585. A second rack 581 that meshes with the second gear 582 movably penetrates the lower part of the fixed box 57. The first rack 567 and the second rack 581 are vertically distributed at 90 degrees. One end of the second rack 581 close to the detection table 8 is fixedly installed with a movable pin 587. The movable pin 587 slidably penetrates the centers of the side clamping block 585 and the side buffer rubber block 586. A fixed block is fixedly installed on the side of the second rack 581 close to the movable pin 587 at the bottom. A second spring 584 is fixedly installed between the fixed block and the inner wall of the fixed box 57.

[0029] During use, first place multiple backlight modules to be tested on the top of the backing plate 6. At this time, start the first servo motor 51. The output end of the first servo motor 51 drives the bidirectional lead screw 52 to rotate, driving the two second movable blocks 55 and the supporting plate 53 thereon to move towards the center of the detection table 8. At the same time, it drives the fixed box 57 and the side clamping assembly 58 thereon to move towards the center of the detection table 8, driving the side clamping block 585 and the side buffer rubber block 586 thereon to move towards the center of the detection table 8. When the movable pin 587 contacts the backlight module, the continuous movement of the fixed box 57 drives the second rack 581 to move away from the backlight module, while compressing the second spring 584, synchronously driving the second gear 582 and the fixed shaft 583 thereon to rotate, and at the same time driving the first gear 568 to rotate, then synchronously driving the first rack 567 and the fixed rod 564 thereon to move downward, then synchronously driving the movable sleeve 566 and the connecting rod 563 thereon to move downward, and at the same time driving the top pressing block 562 and the top buffer rubber block 561 thereon to move downward. Until the side buffer rubber block 586 stably clamps the side of the backlight assembly, at the same time the top buffer rubber block 561 presses the top of the backlight assembly from top to bottom, realizing side clamping and top pressing fixation, with strong clamping stability, and the linkage between the top pressing assembly 56 and the side clamping assembly 58 realizes the synchronous clamping and synchronous loosening of the top pressing assembly 56 and the side clamping assembly 58, without the need for separate operation. When it is necessary to clamp backlight assemblies of different thicknesses, turn the handle on the locking screw 565 to loosen the locking of the locking screw 565 on the fixed rod 564, slide the movable sleeve 566 up and down along the direction of the fixed rod 564, indirectly driving the top buffer rubber block 561 to slide up and down along the direction of the fixed rod 564 until it moves to the appropriate position, and then reverse-tighten the locking screw 565 to lock it, which is convenient for clamping backlight assemblies of different sizes. The side buffer rubber block 586 and the top buffer rubber block 561 are used for buffering to avoid damaging the backlight assembly.

[0030] Please refer to Figure 1 and Figure 2 , the positioning and plugging mechanism 4 includes a mounting seat 42 fixedly connected to the rear side of the top plate 1. A number of limiting grooves for mounting the plugs of the backlight module are evenly opened on the top of the mounting seat 42, and a cover plate 41 for pressing and fixing the plugs is snap-connected to the mounting seat 42. Two electric slide rails 46 are symmetrically and fixedly installed on the left and right sides of the rear side of the top plate 1. Electric sliders 43 are slidably connected to both of the two electric slide rails 46. A movable seat 45 is fixedly connected to the tops of the two electric sliders 43. A socket 44 corresponding to the position of the plug one by one is fixedly connected to the movable seat 45, and the socket 44 is connected to the power supply.

[0031] After the backlight assembly is stably clamped, the plug on the backlight assembly is then placed into the limiting groove at the top of the mounting base 42, and then the cover plate 41 is used to press and fix the plug in a snap-fastening manner. At this time, the electric slide rail 46 is started, driving the electric slide rail 46 and the electric slider 43 thereon to move towards the mounting base 42, synchronously driving the socket 44 to move towards the mounting base 42, realizing the automatic alignment and insertion of multiple sockets 44 and plugs, without the need for manual operation one by one, saving time and effort. In the test work that requires multiple pluggings and unpluggings, the test efficiency is greatly improved. During the plugging and unplugging test, the CCD image sensor 10 takes pictures of the backlight assembly in the powered-on state and compares and analyzes them with the normal backlight assembly pictures in the database. If it is unqualified, the unqualified product is directly removed. If it is qualified, the test continues.

[0032] Please refer to Figure 1 、 Figure 6 and Figure 7 , the flapping and vibrating mechanism 7 includes two symmetrically arranged ear plates 71 fixedly connected to the bottom of the top plate 1. A transmission rod 73 is rotatably connected between the two ear plates 71. Two fixed sleeves are symmetrically and fixedly installed on the transmission rod 73. A number of rubber flapping plates 74 are evenly fixedly installed on the outer circumference of the fixed sleeves. A second servo motor 72 is fixedly connected to the left ear plate 71. The output end of the second servo motor 72 is fixedly connected to the left end of the transmission rod 73.

[0033] After the plugging and unplugging test is qualified and the backlight assembly remains in the powered-on state, the second servo motor 72 is started at this time, driving the transmission rod 73 and the rubber flapping plates 74 thereon to rotate. The rubber flapping plates 74 rotate and flap the bottom of the test bench 8. The vibration of the flapping is transmitted to the backlight assembly through the test bench 8 and the backing plate 6. After the flapping is over, the CCD image sensor 10 takes pictures of the backlight assembly in the powered-on state and compares and analyzes them with the normal backlight assembly pictures in the database. If it is unqualified, the unqualified product is directly removed. If it is qualified, the test continues. The test of the backlight assembly in the vibration and flapping state facilitates the screening and elimination of the backlight assemblies that may have virtual soldering and stroboscopic phenomena, ensuring the quality reliability of the backlight assemblies leaving the factory.

[0034] Please refer to Figure 1 、 Figure 7 and Figure 8, the multi-point pressing mechanism 3 includes a transverse movement component 31, a rubber pressing head 32, a first telescopic rod 33, a first mounting plate 34, and a third servo motor 35. The transverse movement component 31 is arranged on the detection table 8. Four support legs 2 are respectively and fixedly connected to the four corners of the bottom of the detection table 8. The transverse movement component 31 includes four side plates 311 fixedly connected to the four corners of the top of the detection table 8. The four side plates 311 are divided into two groups in pairs and are symmetrically distributed left and right. A one-way lead screw 315 is rotatably connected between the two side plates 311 in the same group. The rear ends of the two one-way lead screws 315 are connected by a belt drive. A first moving block 314 is threadedly connected to the middle of the one-way lead screw 315 through a ball nut. A first mounting plate 34 is fixedly connected to the bottom of the two first moving blocks 314. A number of first telescopic rods 33 are evenly installed at the bottom of the first mounting plate 34. The bottom end of the output end of the first telescopic rod 33 is fixedly installed with a rubber pressing head 32. Two limiting blocks 313 are fixedly installed on the two first moving blocks 314 symmetrically left and right. A guide rod 312 slidably penetrates through the middle of the two limiting blocks 313. Ear blocks 316 are fixedly installed at both ends of the guide rod 312. The ear blocks 316 are fixedly installed on the side plates 311. A third servo motor 35 is fixedly connected to the side plate 311 on the right. The output end of the third servo motor 35 is fixedly connected to the front end of the one-way lead screw 315 on the right.

[0035] In the initial state, the first mounting plate 34, the first telescopic rod 33, and the rubber pressing head 32 are located at the frontmost side. At this time, the third servo motor 35 is started. The output end of the third servo motor 35 drives the one-way lead screw 315 on the left to rotate. Through the belt drive, the one-way lead screw 315 on the right is driven to rotate synchronously, realizing the synchronous rotation of the two one-way lead screws 315. At this time, the first moving block 314 and the first mounting plate 34 thereon are driven to move backward, and then the first telescopic rod 33 and the rubber pressing head 32 are synchronously driven to move backward. Each time the third servo motor 35 rotates the same number of turns, the first telescopic rod 33 and the rubber pressing head 32 are driven to move backward at equal intervals. After moving to the specified position, the output end of the first telescopic rod 33 extends, driving the rubber pressing head 32 to press the backlight assembly downward, realizing the equal-interval pressing test of the backlight assembly, achieving uniform pressing of each position of the backlight assembly, ensuring that the pressing positions of the backlight assemblies in different batches are the same, reducing the detection error, and improving the detection accuracy. Until the first mounting plate 34 moves to contact the delay contact switch 11, at this time, the third servo motor 35 reverses to drive the one-way lead screw 315 to reverse synchronously, and then the first telescopic rod 33 and the rubber pressing head 32 are quickly reset forward, facilitating subsequent tests and improving the test efficiency. That is, after the first telescopic rod 33 and the rubber pressing head 32 are reset, when the pressing test is completed, at this time, the CCD image sensor 10 takes a photo of the backlight assembly in the powered-on state and compares and analyzes it with the normal backlight assembly photo in the database. If it is unqualified, the unqualified product is directly removed. If it is qualified, the test continues.

[0036] It should be noted that, when using the device and method for quality inspection of the backlight module of a liquid crystal display screen, first place the backlight assembly to be tested on the top of the pad 6, and use the positioning and clamping mechanism 5 to clamp the backlight assembly on the side and crimp it on the top, with good clamping stability. After the clamping is stable, the plug on the backlight assembly is placed into the limiting groove on the top of the mounting seat 42, and then the cover plate 41 is used to crimp and fix the plug in the form of a buckle. At this time, the electric slide rail 46 is started to drive the electric slide rail 46 and the electric slider 43 thereon to move toward the mounting seat 42, and simultaneously drive the socket 44 to move toward the mounting seat 42, thereby realizing automatic alignment and plugging of multiple sockets 44 with plugs, without the need for manual operation one by one, saving time and effort, and greatly improving the test efficiency in test work that requires multiple plugging and unplugging, and the plug-in test is simple and reliable. During the process, the CCD image sensor 10 takes a photo of the backlight assembly in the power-on state, and compares and analyzes it with the photos of normal backlight assemblies in the database. If it is unqualified, the unqualified product will be directly removed, and if it is qualified, the test will continue. Then, the backlight assembly is kept in the power-on state, and the bottom of the detection table 8 is rotated and tapped by the tapping vibration mechanism 7. The tapping vibration is transmitted to the backlight assembly through the detection table 8 and the pad 6. After the tapping, the CCD image sensor 10 takes a photo, and the above operation is repeated for comparative analysis, which is conducive to removing the backlight assembly with cold solder joints and ensuring the stability of the factory quality. Then, the multi-point pressing mechanism 3 is used to press the backlight assembly at multiple points with equal spacing. After the pressing is completed, the photos are repeatedly taken to detect whether the backlight assembly is normal, which is convenient for testing the backlight assembly under different working conditions by a single device.

[0037] See also Figure 10 A method for detecting the quality of a liquid crystal display backlight module is provided, the method comprising the following steps: S1. Backlight assembly loading and clamping: multiple backlight assemblies to be inspected are placed on the top of the pad 6 in sequence, and then the positioning and clamping mechanism 5 is used to clamp the sides and press the top to stably position and clamp the backlight assemblies.

[0038] S2. Integrated plug-in and pull-out detection: The positioning plug-in mechanism 4 is used to realize the synchronous power-on and power-off of the plugs of multiple backlight components. After power-on, the CCD image sensor 10 is used to take pictures and compare them with the normal backlight components stored in the database to compare whether there are scratches, foreign matter, white spots, light leakage and other phenomena. If there is a difference in the comparison, it means that the backlight component is qualified. If the above phenomena exist, it means that it is unqualified.

[0039] S3. Vibration and Patting: With power supply on, use the patting and vibrating mechanism 7 to pat the bottom of the inspection table 8. During the vibration and patting process, use the CCD image sensor 10 to take pictures and compare them with the normal backlight modules stored in the database to detect whether the backlight module works properly under the vibration condition.

[0040] S4. Multi - point Pressing in Zones: While vibrating and patting, use the multi - point pressing mechanism 3 to perform multi - point pressing on the top of the backlight module. After the pressing is completed, use the CCD image sensor 10 to take pictures and compare them with the normal backlight modules stored in the database to detect whether the backlight module works properly under the pressing condition.

[0041] S5. Sorting and Storage: After the detection, sort and mark the qualified products and unqualified products. The qualified products enter the next process, and the unqualified products are sent back for repair.

[0042] The above - described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A liquid crystal display backlight module quality inspection device, comprising a top plate (1), characterized in that: The top middle of the top plate (1) is fixedly connected to a detection platform (8), a beating vibration mechanism (7) is arranged below the top plate (1), a positioning clamping mechanism (5) is arranged on the detection platform (8), and a multi-point pressing mechanism (3) is arranged on the top plate (1) and the detection platform (8), a positioning plugging mechanism (4) is arranged on the rear side of the top of the top plate (1), a fixing frame (9) is arranged in the middle of the rear side of the top plate (1), a CCD image sensor (10) is arranged on the front side of the top of the fixing frame (9), and a data connection is established between the CCD image sensor (10) and the background processor; Two pads (6) for supporting the backlight module are fixed symmetrically on the top of the detection table (8), and the positioning plug-in mechanism (4) includes a mounting seat (42) fixedly connected to the rear side of the top of the top plate (1), and a plurality of limiting grooves for mounting the plug of the backlight module are evenly opened on the top of the mounting seat (42), and a cover plate (41) for crimping and fixing the plug is clamped on the mounting seat (42) by a buckle, and two electric slide rails (46) are fixedly installed symmetrically on the rear side of the top of the top plate (1), and the two electric slide rails (46) are slidably connected to the electric slider (43), and the tops of the two electric sliders (43) are fixedly connected to a movable seat (45), and the movable seat (45) is fixedly connected to a socket (44) corresponding to the position of the plug.

2. The device for detecting quality of a liquid crystal display backlight module according to claim 1, characterized in that: The positioning and clamping mechanism (5) comprises a limiting groove (54) provided in the middle of the top of the detection platform (8), a bidirectional screw rod (52) being rotatably connected inside the limiting groove (54), a No. 1 servo motor (51) being fixedly connected to the middle of the front side of the detection platform (8), an output end of the No. 1 servo motor (51) being fixedly connected to the front end of the bidirectional screw rod (52), two No. 2 movable blocks (55) being symmetrically connected to the bidirectional screw rod (52) by ball nut threads, the No. 2 movable blocks (55) being slidably connected inside the limiting groove (54), the tops of the two No. 2 movable blocks (55) being fixedly connected to a supporting plate (53), a plurality of fixing boxes (57) being evenly arranged on the supporting plate (53), the fixing boxes (57) being provided with a top crimping assembly (56) and a side clamping assembly (58), and a time-delay contact switch (11) being fixedly installed on the top of the fixing box (57) located on the right rear side.

3. The device for detecting quality of a liquid crystal display backlight module according to claim 2, characterized in that: The top crimping assembly (56) comprises a No. 1 rack (567) movably penetrating the top and bottom of the fixed box (57); the top of the No. 1 rack (567) is fixedly connected to a fixed rod (564); a movable sleeve (566) is slidably sleeved on the fixed rod (564); a connecting rod (563) is fixedly connected to the outer side of the movable sleeve (566) close to the detection table (8); an end of the connecting rod (563) away from the fixed rod (564) is fixedly connected to a top crimping block (562); a top buffer rubber block (561) is fixedly installed at the bottom of the top crimping block (562); and a locking screw (565) is threadedly connected to the outer side of the movable sleeve (566) away from the detection table (8).

4. The device for detecting quality of a liquid crystal display backlight module according to claim 3, characterized in that: The side clamping assembly (58) comprises two No. 2 mounting plates (588) fixedly connected to the inside of the fixing box (57) in a symmetrical manner, a fixed shaft (583) running through the two No. 2 mounting plates (588) for common rotation, a No. 2 gear (582) fixedly sleeved in the middle of the fixing shaft (583), a No. 1 gear (568) meshing with a No. 1 rack (567) fixedly sleeved at one end of the fixing shaft (583), a side clamping block (585) fixedly mounted on one side of the fixing box (57) close to the detection table (8), a side buffer rubber block (586) fixedly mounted on the side clamping block (585), a No. 2 rack (581) meshing with the No. 2 gear (582) movably running through the lower part of the fixing box (57), the No. 1 rack (567) and the No. 2 rack (581) being vertically distributed at 90 degrees.

5. The device for detecting quality of a liquid crystal display backlight module according to claim 4, characterized in that: A movable pin (587) is fixedly mounted on one end of the No. 2 rack (581) close to the detection table (8), and the movable pin (587) slides through the center of the side clamping block (585) and the side buffer rubber block (586). A fixed block is fixedly mounted on one side of the bottom of the No. 2 rack (581) close to the movable pin (587), and a No. 2 spring (584) is fixedly mounted between the fixed block and the inner wall of the fixed box (57).

6. The device for detecting quality of a liquid crystal display backlight module according to claim 1, characterized in that: The flapping vibration mechanism (7) comprises two ear plates (71) fixedly connected to the bottom of the top plate (1) in a symmetrical manner, a transmission rod (73) being rotatably connected between the two ear plates (71), two fixed sleeves being fixedly installed on the transmission rod (73) in a symmetrical manner, a plurality of rubber flapping plates (74) being fixedly installed uniformly on the outer circumference of the fixed sleeve, a second servo motor (72) being fixedly connected to the ear plate (71) on the left, and an output end of the second servo motor (72) being fixedly connected to the left end of the transmission rod (73).

7. The device for detecting quality of a liquid crystal display backlight module according to claim 1, characterized in that: The multi-point pressing mechanism (3) comprises a transverse movement component (31), a rubber pressing head (32), a first telescopic rod (33), a first mounting plate (34) and a third servo motor (35). The transverse movement component (31) is arranged on a testing platform (8), and the four corners of the bottom of the testing platform (8) are respectively fixedly connected to support legs (2).

8. The device for detecting quality of a liquid crystal display backlight module according to claim 7, characterized in that: The transverse movement assembly (31) comprises four side panels (311) fixedly connected to the four corners of the top of the detection platform (8), the four side panels (311) are arranged in groups of two and are symmetrically distributed on the left and right, a one-way screw rod (315) is rotatably connected between the two side panels (311) in the same group, the rear ends of the two one-way screw rods (315) are connected by a belt drive, the middle of the one-way screw rod (315) is threadedly connected to a No. 1 movable block (314) through a ball nut, the bottoms of the two No. 1 movable blocks (314) are fixedly connected to a No. 1 mounting plate (34), a plurality of No. 1 telescopic rods (33) are evenly installed on the bottom of the No. 1 mounting plate (34), the bottom of the output end of the No. 1 telescopic rod (33) is fixedly installed with a rubber pressing head (32), a No. 3 servo motor (35) is fixedly connected to the side panel (311) located on the right side, and the output end of the No. 3 servo motor (35) is fixedly connected to the front end of the one-way screw rod (315) located on the right side.

9. The device for detecting quality of a liquid crystal display backlight module according to claim 8, characterized in that: Two limit blocks (313) are fixedly installed on the two first movable blocks (314) in a bilaterally symmetrical manner, a guide rod (312) is slidably penetrated through the middle of the two limit blocks (313), ear blocks (316) are fixedly installed on both ends of the guide rod (312), and the ear blocks (316) are fixedly installed on the side plate (311).

10. A method for detecting the quality of a liquid crystal display backlight module, based on the liquid crystal display backlight module quality detection device according to any one of claims 1 to 9, characterized in that: The method for detecting the quality of a liquid crystal display backlight module comprises the following steps: S1, backlight assembly loading and clamping: multiple backlight assemblies to be inspected are placed on the top of the pad (6) in sequence, and then the positioning and clamping mechanism (5) is used to clamp the sides and press the top to stably position and clamp the backlight assemblies; S2, integrated plug-in and pull-out detection: using the positioning plug-in mechanism (4) to achieve synchronous power-on and power-off of the plugs of multiple backlight components, after power-on, using the CCD image sensor (10) to take pictures, and compare with the normal backlight components stored in the database to compare whether there are scratches, foreign matter, white spots and light leakage. If there is a difference in the comparison, it means that the backlight component is qualified, and if the above phenomena exist, it means that it is unqualified; S3, vibration tapping: while ensuring that the power is on, tapping the bottom of the test platform (8) using the tapping vibration mechanism (7), during the vibration tapping process, taking pictures using the CCD image sensor (10), and comparing the pictures with the normal backlight components stored in the database to detect whether the backlight components are working normally under the vibration condition; S4, pressing by area: while vibrating and tapping, use the multi-point pressing mechanism (3) to press the top of the backlight assembly at multiple points. After the pressing is completed, use the CCD image sensor (10) to take a picture and compare it with the normal backlight assembly stored in the database to detect whether the backlight assembly is working normally under the pressure condition; S5. Sorting and storage: After the inspection is completed, qualified products and unqualified products are sorted and marked. Qualified products enter the next process, and unqualified products are returned for inspection.

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