Liquid crystal display screen defect detection device and method

Abstract

This invention relates to the field of screen defect detection equipment technology, and provides a liquid crystal display screen defect detection device and method, including a conveying unit and a dynamic-static combined platform above it, as well as a three-dimensional motion unit and a defect detection camera; a fixed seat is fixed above the dynamic-static combined platform; the three-dimensional motion unit includes a horizontal arm, and the defect detection camera is located at the end of the horizontal arm; the dynamic-static combined platform includes a dynamic load module and a static load module, the dynamic load module is slidably mounted on top of the elastic seat in the left-right direction, and a reset mechanism is provided between the right end of the static load module and the right end of the dynamic load module. A stopping unit intercepts the dynamic load module to form macroscopic positioning, and a light-shielding unit drives a positioning rod to insert into a positioning cylinder to form microscopic positioning while simultaneously sealing the elastic seat. Utilizing the integrated light source array within the multi-light source integrated unit, it can simultaneously achieve continuous dark-box multi-defect type detection and precise display screen positioning to prevent tilting.

Description

Technical Field

[0001] This invention relates to the field of screen defect detection equipment technology, and more specifically, to a liquid crystal display screen defect detection device and method. Background Technology

[0002] With the rapid development of liquid crystal display technology, liquid crystal displays (LCDs) have been widely used in televisions, computer monitors, smartphones, tablets, and various smart terminal devices. Consumers have increasingly higher requirements for the quality of displays, especially in terms of visual experience; even the slightest surface defect can affect the user's perception and user experience.

[0003] After the LCD screen is manufactured, it undergoes inspection, primarily using optical inspection equipment to detect defects. There are two main methods for defect detection:

[0004] Defect detection mode 1, Stop-Shoot-Go mode: The display screen is transported to the detection station by the conveyor, the conveyor belt stops, the camera takes a picture (millisecond level), the image data is transmitted to the processor for analysis, the conveyor is started to send the current screen away, and the next screen enters.

[0005] Defect detection mode two, continuous shooting mode, the display screen moves at a constant speed on the conveyor without stopping, and the line scan camera scans the moving display screen line by line like a scanner, and finally "stitches" it into a complete image for analysis.

[0006] Currently, Mode 1 requires frequent start-stop operations, which not only takes up time but also easily leads to accelerated equipment damage. Although Mode 2 does not require frequent start-stop operations, its technical complexity and investment costs are extremely high, and the accuracy of mobile scanning detection is insufficient for detecting minute defects.

[0007] To address the aforementioned problems, this application proposes a device and method for detecting defects in liquid crystal display screens. Summary of the Invention

[0008] The purpose of this invention is to provide a device and method for detecting defects in liquid crystal display screens, which solves the problems of high failure rate and high cost of continuous testing caused by frequent start-stop of existing display screen defect detection equipment.

[0009] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0010] A liquid crystal display screen defect detection device includes a conveying unit and a dynamic and static combined platform above it, and also includes a three-dimensional motion unit and a defect detection camera.

[0011] A fixed base is fixedly provided above the dynamic and static combined platform;

[0012] The three-dimensional motion unit includes a horizontal arm, and the defect detection camera is located at the end of the horizontal arm;

[0013] The combined dynamic and static platform includes a dynamic load module and a static load module. The dynamic load module is slidably mounted on top of the elastic seat in the left and right directions. A reset mechanism is provided between the right end of the static load module and the right end of the dynamic load module.

[0014] The transmission unit is provided with a stopping unit above it, which includes a baffle that moves back and forth in the front and back directions;

[0015] The defect detection camera includes a lens module, and multiple interchangeable filters are provided below the lens module;

[0016] The defect detection camera has a multi-light source integrated unit detachably mounted below it, and the lens module is located inside the upper end of the multi-light source integrated unit.

[0017] Below the multi-light source integrated unit is a light-shielding unit that moves up and down, and a positioning mechanism is provided between the outer side of the light-shielding unit and the dynamic load module.

[0018] A method for detecting defects in a liquid crystal display screen includes the following steps:

[0019] S1. A baffle that moves back and forth in the front and rear directions abuts against one of the dynamic load modules to form a primary positioning, causing the dynamic load module to stop while the static load module below it continues to move.

[0020] S2. The light-shielding unit, which moves up and down, is lowered and placed on the outside of the dynamic load module. The positioning mechanism between the outside of the light-shielding unit and the dynamic load module is used to perform secondary positioning of the dynamic load module, so that the display screen is fixed in the predetermined position for defect detection.

[0021] S3. By switching between filters below the lens module, when one of the filters is positioned below the lens module, the corresponding white LED array, red LED array, infrared LED array, or ultraviolet LED array is illuminated, and multiple photos of the display screen are continuously taken by the defect detection camera.

[0022] S4. Through the lifting and lowering movement of the light-shielding unit and the reciprocating movement of the baffle, the limit on the dynamic load module is released simultaneously. Using the reset mechanism between the right end of the static load module and the right end of the dynamic load module, the dynamic load module is reset to the initial position and enters the next process.

[0023] The beneficial effects of this invention are:

[0024] 1. By installing a stationary display screen platform above the conveyor unit, the platform entering the defect detection station can be stopped during defect detection operations and reset after the defect detection operations. During this period, the conveyor unit maintains normal movement. It has both the detection accuracy of stop, move, and shoot modes and the continuity of flying shoot mode. Moreover, the structure is simple and can quickly establish a production line, avoiding the risk of failure from frequent start-stop.

[0025] 2. By combining the defect detection camera with the multi-light source integrated unit, and utilizing the rotating filter and the white LED array, red LED array, infrared LED array and ultraviolet LED array integrated inside the multi-light source integrated unit, the detection rate of various defects such as mura, fine scratches, particles and internal impurities can be significantly improved during defect detection operations by the spectral sensitivity of different defects, effectively avoiding the situation of some defects being missed.

[0026] 3. By installing a lifting light-shielding unit above the defect detection station and connecting it to the cam plate through the light-shielding cloth, a seal can be formed by pressing the lower edge of the light-shielding unit with the elastic seat, thereby realizing the dark box defect detection operation, effectively avoiding mutual interference between the detection equipment and the outside world, and ensuring the accuracy of the defect detection operation.

[0027] 4. Macro positioning is achieved by stopping the display screen platform through the reciprocating motion of the baffle. Then, the lifting motion of the light-shielding unit drives the positioning rod to insert into the positioning cylinder to achieve micro positioning. This ensures the sealing between the light-shielding unit and the platform, and also ensures that the display screen is stopped in the predetermined position, which facilitates defect detection and helps to improve the overall work efficiency and stability. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the three-dimensional motion unit structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the defect detection camera part of the present invention;

[0032] Figure 4 This is a schematic diagram of the transmission unit structure of the present invention;

[0033] Figure 5This is a schematic diagram of the structure of the stopping unit and the combined dynamic and static platform with the conveying unit of the present invention;

[0034] Figure 6 This is a schematic diagram of the dynamic and static combined platform and its internal structure according to the present invention;

[0035] Figure 7 This is a schematic diagram of the lower part of the dynamic and static combined platform of the present invention;

[0036] Figure 8 This is a schematic diagram of the side planar structure of the dynamic and static combined platform of the present invention;

[0037] Figure 9 This is a schematic diagram of the defect detection camera, multi-light source integration unit, and light-shielding unit of the present invention.

[0038] Figure 10 This is a schematic diagram of the internal structure of the multi-light source integrated unit of the present invention;

[0039] Figure 11 This is a schematic diagram of the internal structure of the light-shielding unit of the present invention;

[0040] Figure 12 This is a schematic diagram of the cross-sectional structure of the display screen micro-positioning structure of the present invention;

[0041] The attached diagram lists the components represented by each number as follows:

[0042] In the picture:

[0043] 1. Conveying unit; 101. Defect detection station;

[0044] 2. Three-dimensional motion unit;

[0045] 21. Cross arm; 211. Rotating module;

[0046] 3. Dynamic and static combined platform;

[0047] 31. Dynamic load module; 301. Fixing base; 311. Sliding sleeve; 312. Fixing plate;

[0048] 32. Flexible seat;

[0049] 33. Static load module; 331. Support base; 3311. Slide rail; 332. Reset buffer mechanism; 3321. Telescopic link; 3322. Elastic reset mechanism;

[0050] 34. Positioning module; 341. Positioning cylinder;

[0051] 4. Defect detection camera;

[0052] 41. Camera mount; 411. Lens module;

[0053] 42. Filter module; 421. Filter; 422. Rotating frame;

[0054] 5. Multi-light source integrated unit; 501. White LED array; 502. Red LED array; 503. Infrared LED array; 504. Ultraviolet LED array;

[0055] 51. Adapter sleeve; 52. Convex plate;

[0056] 6. Light-shielding unit;

[0057] 61. Boss; 611. Side wing; 6111. Positioning rod; 61111. Ball bearing;

[0058] 62. Blackout fabric;

[0059] 7. Interception unit;

[0060] 71. Baffle; 72. Adapter plate; 73. Guide rod; 74. Telescopic mechanism;

[0061] 81. Fixed platform; 811. Lifting mechanism. Detailed Implementation

[0062] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0063] A liquid crystal display screen defect detection device and method are designed to improve the efficiency and accuracy of display screen defect detection and reduce investment costs. The device utilizes a movable moving module 31 in the upper region of a dynamic-static combined platform 3, which can be intercepted and stopped by a stopping unit 7 to achieve macroscopic positioning. Then, the lifting and lowering movement of a light-shielding unit 6 causes a positioning rod 6111 to insert into a positioning cylinder 341 to achieve microscopic positioning. Simultaneously, the light-shielding unit 6 abuts against an elastic seat 32 to form a seal, placing the display screen in a dark box area. Finally, the integrated white LED array 501, red LED array 502, infrared LED array 503, and ultraviolet LED array 504 within a multi-light source integrated unit 5, combined with the rotational switching of a filter 421, enables continuous dark box-type multi-defect detection and precise display screen positioning to prevent skew, thus improving the efficiency and accuracy of display screen defect detection operations.

[0064] In some embodiments, the specific structure of the liquid crystal display screen defect detection device is as follows: Figure 1-12As shown, it includes a transmission unit 1 and a three-dimensional motion unit 2, and multiple dynamic and static combined platforms 3 for carrying display screens are arranged above the transmission unit 1.

[0065] The conveying structure of the conveying unit 1 is a ring-shaped conveyor belt. One section of the conveyor belt is set as a defect detection station 101. Similarly, other sections can be set as flipping stations and loading / unloading stations, which are conventional technical means in this field and will not be described in detail here.

[0066] The three-dimensional motion unit 2 includes a column and a horizontal arm 21. The horizontal arm 21 is rotatably mounted with a defect detection camera 4 at its end, which is used to swing the defect detection camera 4 back and forth to the required tilt angle.

[0067] It should be noted that in this specification, the direction in which the three-dimensional motion unit 2 faces the defect detection camera 4 is considered the front. Based on this, the direction in which the three-dimensional motion unit 2 moves away from the defect detection camera 4 is considered the rear, and so on for other directions.

[0068] It should also be noted that the horizontal arm 21 and the three-dimensional motion unit 2 are used to realize the sliding motion of the defect detection camera 4 in the front-back, left-right, and up-down directions. This is a conventional technical means in this field and will not be described in detail here.

[0069] Please see Figure 4-8 The dynamic and static combined platform 3 includes a dynamic load module 31 and a static load module 33, with the dynamic load module 31 located above the static load module 33;

[0070] It should be noted that a mounting base 301 is installed on the top of the dynamic load module 31. This base is a vacuum adsorption stage used to fix the display screen. This is a conventional technical means in this field and will not be described in detail here.

[0071] Among them, the main body of the static load module 33 is the support base 331, and the front and rear sides near the upper region are provided with slide rails 3311. The support base 331 is fixedly installed in the left region below the dynamic load module 31, and the support bases 331 are distributed on the front and rear sides of the support base 331 and are slidably connected to the slide rails 3311.

[0072] It is understandable that the sliding connection between the sliding sleeve 311 and the slide rail 3311 enables the dynamic load module 31 to slide in the left and right directions relative to the support base 331.

[0073] Among them, a fixing plate 312 is fixedly installed on the lower right end of the dynamic load module 31, the left end of the support base 331 is located at the left-right center of the dynamic load module 31, and a reset buffer mechanism 332 is installed between the end face of the support base 331 and the fixing plate 312.

[0074] Furthermore, an elastic reset mechanism 3322 is slidably installed inside the reset buffer mechanism 332, and one end of the elastic reset mechanism 3322 is fixedly connected to the fixed plate 312.

[0075] Furthermore, an elastic reset mechanism 3322 is installed between one end of the reset buffer mechanism 332 and the fixed plate 312;

[0076] It should be noted that the combination of the reset buffer mechanism 332 and the telescopic link 3321 is preferably a damping telescopic link, which is used to reduce the speed of the dynamic load module 31 when it slides to the left.

[0077] The elastic reset mechanism 3322 is preferably a strong spring, which is used to drive the dynamic load module 31 to slide continuously to the left, so that the sliding sleeve 311 is reset to the leftmost region.

[0078] It is understandable that when the sliding sleeve 311 slides from the right end region to the left end region of the slide rail 3311, it is the reset movement of the dynamic load module 31. The driving force is applied by the elastic reset mechanism 3322, which works in conjunction with the reset buffer mechanism 332 to slow down the movement, so as to achieve a smooth sliding movement when the dynamic load module 31 is reset.

[0079] Among them, a stop unit 7 is installed in the defect detection station 101 area, including a baffle 71, a transition plate 72, a guide rod 73, and a telescopic mechanism 74;

[0080] Furthermore, the baffle 71 is located above the conveyor belt and has an L-shaped plate structure. The lower edge of the baffle 71 is located above the static load module 33 and is at the same height as the lower edge of the dynamic load module 31.

[0081] The adapter plate 72 is located on the side of the frame of the conveyor unit 1 away from the conveyor belt, and the guide rod 73 passes through the frame of the conveyor unit 1 and is fixedly connected to the short plate of the baffle 71 and the adapter plate 72. At this time, the baffle 71 can slide in the front and back directions.

[0082] Furthermore, a telescopic mechanism 74 is installed between the frame of the transmission unit 1 and the adapter plate 72;

[0083] It should be noted that the telescopic mechanism 74 is preferably an electric telescopic push rod, which is a conventional technical means in this field and will not be described in detail here;

[0084] In addition, the stopping units 7 are symmetrically distributed in the front and rear areas of the conveyor belt;

[0085] It is understandable that the telescopic mechanism 74 can drive the baffle 71 to enter and exit the transport area of ​​the dynamic and static combined platform 3 via the adapter plate 72 and the guide rod 73, thereby blocking the dynamic load module 31 to achieve the interception effect. At this time, the static load module 33 continues to move to the left under the drive of the conveyor belt.

[0086] It is also understandable that the stopping of the dynamic load module 31 can be detected by the defect detection camera 4. After a short inspection operation, the telescopic mechanism 74 drives the baffle 71 to release the obstruction of the dynamic load module 31. At this time, the dynamic load module 31 is stably reset under the action of the elastic reset mechanism 3322 and the reset buffer mechanism 332.

[0087] Please see Figure 1-3 and Figure 9-10 The defect detection station 101 area is equipped with a multi-light source integrated unit 5, located below the defect detection camera 4, and the two are detachably connected.

[0088] It should be noted that a camera support 41 is fixedly installed at the lower end of the defect detection camera 4, and the lens part of the defect detection camera 4, namely the lens module 411, is located below the camera support 41.

[0089] Among them, the multi-light source integration unit 5 is a hemispherical cover structure with the opening facing downwards;

[0090] Furthermore, a longitudinal circular structure, which is an adapter sleeve 51, is fixedly installed on the upper end of the multi-light source integrated unit 5 near the central area. It is fixedly connected to the outer wall of the camera support 41 by bolts.

[0091] Understandably, the multi-light source integrated unit 5 is detachably mounted below the defect detection camera 4 by bolts, and the two are combined into one unit, moving synchronously under the control of the three-dimensional motion unit 2;

[0092] Among them, the multi-light source integrated unit 5 integrates a white LED array 501, a red LED array 502, an infrared LED array 503, and an ultraviolet LED array 504, all of which are ring arrays, distributed sequentially from the inner circle to the outer circle.

[0093] Furthermore, the high-angle parallel white LED array 501 is used to assist the defect detection camera 4 in detecting scratches and dents on the display screen surface;

[0094] A low-angle dark-field red LED array 502 is used to enhance edge scattering of tiny scratches and particles;

[0095] Infrared LED array 503 is used to detect bubbles or delamination inside the screen, and assists defect detection camera 4 in detecting defects inside the display screen.

[0096] The ultraviolet LED array 504 is used to excite the fluorescence of certain specific contaminants or coating defects, and the auxiliary defect detection camera 4 expands the range of types of defects that can be detected in the display screen.

[0097] Furthermore, a filter module 42, including a drive section and a switching section, is installed on one side of the camera mount 41;

[0098] The drive unit is located above the camera support 41 and is a miniature rotary motor used to drive the switching group to rotate.

[0099] The switching assembly includes a filter 421 and a rotating frame 422. The rotating frame 422 consists of a central fixed plate and four circular frames that are equally spaced around its outer circumference, and the filter 421 is installed inside the circular frames.

[0100] It should be noted that when the rotating frame 422 is static, one of the circular frame bodies and its internal filter 421 are located directly below the lens module 411.

[0101] It should also be noted that the four narrowband filters 421 correspond to the white LED array 501, the red LED array 502, the infrared LED array 503, and the ultraviolet LED array 504.

[0102] In addition, when a certain filter 421 is located below the lens module 411, for example, when the ultraviolet filter 421 is located below the lens module 411, only its corresponding ultraviolet LED array 504 is lit.

[0103] Understandably, the defect detection camera 4 rapidly and continuously captures multiple images of the display screen at different exposure times under each lighting mode, and then combines them into a high-quality image without overexposure or underexposure. By using image sequences under different spectra and angles, the luminescent characteristics of the display screen are separated from the surface reflection or scattering characteristics, allowing defects that are invisible under the light source to appear in different modes. This achieves the effect of detecting multiple types of defects in the display screen, fully detecting different types of defects to ensure the quality of the finished display screen.

[0104] Please see Figure 1 , 5 -6, 9 and 11, a light-shielding unit 6 is provided below the multi-light source integrated unit 5, the upper part of which is a circular structure and the lower part of which is a square structure;

[0105] Among them, the multi-light source integrated unit 5 has a light-shielding cloth 62 fixedly installed between the upper end of the light-shielding unit 6 and the light-shielding cloth 62 via the lower convex plate 52, and a section of the light-shielding cloth 62 is folded and scattered on the upper outer side of the light-shielding unit 6.

[0106] It is understandable that the folded portion of the light-blocking cloth 62 can maintain the light-blocking sealed connection between the light-blocking unit 6 and the convex plate 52 when the light-blocking unit 6 moves up and down.

[0107] Among them, an elastic seat 32 is fixedly installed above the outer ring area of ​​the dynamic load module 31, and its upper end is inclined towards the inner ring area to increase the area;

[0108] It is understandable that the lifting and lowering movement of the light-shielding unit 6 can form a light-shielding seal by resisting the elastic seat 32 through the square frame structure;

[0109] Among them, the two sides of the conveying unit 1 are far apart from each other and are fixedly installed with a fixed platform 81. The upper end of the fixed platform 81 is fixedly installed with a lifting mechanism 811.

[0110] Furthermore, a boss 61 is fixedly installed on the outer side of the lower region of the light-shielding unit 6, and side wings 611 are fixedly installed on the front and rear regions of the boss 61 respectively, and the movable end of the lifting mechanism 811 is fixedly connected to the lower part of the side wings 611.

[0111] It should be noted that the lifting mechanism 811 is preferably a servo electric cylinder, which is used to drive the side wing 611 to perform rapid and precise lifting movements. The servo electric cylinder is a conventional technology in this field and will not be described in detail here.

[0112] Understandably, the light-shielding unit 6 can be lowered and raised before and after the defect detection operation, so that the defect detection operation is carried out in the dark box area, forming a dark box-style defect detection, which can avoid the defect detection operation from interfering with the external environment.

[0113] Please see Figure 5-6 and Figure 11-12 Positioning modules 34 are fixedly installed at the center of both the front and rear sides of the dynamic load module 31. One end of the positioning module 34 is a semi-circular plate structure, and a positioning cylinder 341 is fixedly installed above the axis.

[0114] The positioning module 34 has through holes at the top and bottom, and the upper end of the positioning cylinder 341 is inclined to the outer ring area, forming an inclined slope structure on the inner side.

[0115] Furthermore, a positioning rod 6111 is fixedly installed at the lower end of the side wing 611, corresponding to the positioning cylinder 341, and the outer edge of the lower end of the positioning rod 6111 is machined to form a tapered slope structure.

[0116] Furthermore, ball bearings 61111 are embedded in the bottom of the side wing 611 and inside the conical slope structure, which can form a guide when the positioning cylinder 341 is pressed against the inner inclined slope structure, causing the dynamic load module 31 to move to the state where the positioning cylinder 341 and the side wing 611 are aligned.

[0117] Understandably, the downward movement of the light-shielding unit 6 can move the dynamic load module 31 to a predetermined position, forming a micro-position. This can prevent the stop failure and avoid the display screen from being tilted, thus helping to improve the accuracy of defect detection operations.

[0118] In some publicly available publications, the specific application methods of liquid crystal display screen defect detection devices are as follows:

[0119] S1, The conveyor belt in front of the conveyor unit 1 is transported from right to left.

[0120] S2. When the dynamic load module 31 moves to the predetermined position, it is blocked by the pre-extended baffle 71. At this time, the support seat 331 continues to move to the left under the drive of the conveyor belt, while the dynamic load module 31 is stuck. At this time, the telescopic link 3321 is pulled out of the interior of the reset buffer mechanism 332.

[0121] S3. When the dynamic load module 31 is stopped, the lifting mechanism 811 lowers the light-shielding unit 6 through the side wing 611, so that the positioning rod 6111 is inserted into the interior of the positioning cylinder 341 and guides the dynamic load module 31 to move to the predetermined position to form micro-positioning. At the same time, it drives the lower edge of the light-shielding unit 6 to abut against the elastic seat 32 to form a seal.

[0122] S4. The defect detection camera 4 starts to capture images of the display screen. During the capture operation, the four filters 421 rotate in and out of the area directly below the lens module 411 in sequence. When the filter 421 corresponds to the lens module 411, the corresponding white LED array 501 or red LED array 502, infrared LED array 503 and ultraviolet LED array 504 are lit. At this time, the defect detection camera 4 continuously captures multiple images with different exposure times, and then combines them into a high-quality image without overexposure or underexposure, and then sends it to the processor for analysis.

[0123] It should be noted that sending images to a processor for analysis and subsequent manual review are standard technical methods in this field, and will not be described in detail here.

[0124] S5. After the defect detection camera 4 finishes shooting, the lifting mechanism 811 raises the side wing 611, causing the light-shielding unit 6 to rise, releasing the connection between the positioning rod 6111 and the positioning cylinder 341. At the same time, the telescopic mechanism 74 drives the baffle 71 to move out and release the obstruction to the dynamic load module 31.

[0125] S6. The elastic reset mechanism 3322 drives the dynamic load module 31 to reset, causing it to slide to the left. At the same time, the reset buffer mechanism 332 slows down the reset speed of the telescopic link 3321, so that the dynamic load module 31 remains in a stable state and resets to enter the subsequent process.

[0126] S7, the telescopic mechanism 74 controls the baffle 71 to enter the conveying area of ​​the dynamic load module 31, waiting to stop the next dynamic load module 31, thus forming a cycle.

[0127] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0128] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A defect detection device for liquid crystal display screens, characterized in that: It includes a conveying unit (1) and a dynamic and static combined platform (3) above it, as well as a three-dimensional motion unit (2) and a defect detection camera (4). A fixed seat (301) is fixed above the dynamic and static combined platform (3); The three-dimensional motion unit (2) includes a horizontal arm (21), and the defect detection camera (4) is located at the end of the horizontal arm (21); The dynamic and static combined platform (3) includes a dynamic load module (31) and a static load module (33). The dynamic load module (31) is slidably mounted on top of the elastic seat (32) in the left and right directions. A reset mechanism is provided between the right end of the static load module (33) and the right end of the dynamic load module (31). The above the transmission unit (1) is provided with a stop unit (7), which includes a baffle (71) that moves back and forth in the front and back directions. The defect detection camera (4) includes a lens module (411), and a plurality of interchangeable filters (421) are provided below the lens module (411). The defect detection camera (4) is detachably mounted with a multi-light source integrated unit (5) below it, and the lens module (411) is located inside the upper end of the multi-light source integrated unit (5). Below the multi-light source integrated unit (5) is a lifting and lowering light-shielding unit (6), and a positioning mechanism is provided between the outer side of the light-shielding unit (6) and the dynamic load module (31). The static load module (33) includes a support base (331). A sliding sleeve (311) is fixedly provided at the lower left end of the dynamic load module (31) and is slidably connected to the slide rails (3311) on the front and rear sides of the support base (331). The reset mechanism is installed between the support base (331) and the fixed plate (312) at the lower right end of the dynamic load module (31). The reset mechanism includes a reset buffer mechanism (332) and a telescopic connecting rod (3321) that is slidably installed inside it. An elastic reset mechanism (3322) is fixed between the end face of the reset buffer mechanism (332) and the fixed plate (312).

2. The liquid crystal display screen defect detection device according to claim 1, characterized in that: The stopping unit (7) includes a transition plate (72) and a guide rod (73). The guide rod (73) passes through the inside of the frame of the conveying unit (1) and is fixedly connected to the baffle (71) and the transition plate (72). A telescopic mechanism (74) is fixed between one side of the transition plate (72) and the frame of the conveying unit (1).

3. The liquid crystal display screen defect detection device according to claim 1, characterized in that: The lower end of the defect detection camera (4) is fixed with a camera support (41), and a filter module (42) is provided on one side of the camera support (41), including a rotating frame (422) with rotating motion. The filter (421) is distributed circumferentially at equal intervals on the outside of the rotating frame (422).

4. The liquid crystal display screen defect detection device according to claim 1, characterized in that: The multi-light source integrated unit (5) is a hemispherical cover structure with the opening facing downward. The interior of the multi-light source integrated unit (5) is integrated with white LED array (501), red LED array (502), infrared LED array (503) and ultraviolet LED array (504) in sequence from the inner circle to the outer circle.

5. The liquid crystal display screen defect detection device according to claim 1, characterized in that: The light-shielding unit (6) includes a circular body and a square body. A folded light-shielding cloth (62) is fixed between the upper end of the circular body and the convex disk (52) at the lower end of the multi-light source integration unit (5). The lower end of the square body corresponds to the elastic seat (32) near the outer ring area at the upper end of the dynamic load module (31).

6. The liquid crystal display screen defect detection device according to claim 1, characterized in that: The positioning mechanism includes a side wing (611) and a positioning cylinder (341). The side wing (611) is fixed on the front and rear sides of the boss (61) installed in the lower area of ​​the light-shielding unit (6). The side frame of the conveying unit (1) is fixed with a fixed platform (81). A lifting mechanism (811) is fixed between the fixed platform (81) and the side wing (611). The positioning cylinder (341) is fixed above the positioning module (34) installed on both the front and rear sides of the dynamic load module (31).

7. The liquid crystal display screen defect detection device according to claim 6, characterized in that: The lower end of the side wing (611) is fixed with a positioning rod (6111). The lower end of the positioning rod (6111) and the inner side of the upper end of the positioning cylinder (341) are both provided with a tapered slope structure. The lower end of the positioning rod (6111) is embedded with a ball bearing (61111).

8. A method for detecting defects in a liquid crystal display screen, applied to the liquid crystal display screen defect detection apparatus as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. The baffle (71) that moves back and forth in the front and rear directions abuts against one of the dynamic load modules (31) to form a primary positioning, so that the dynamic load module (31) stops while the static load module (33) below it continues to move. S2. The light-shielding unit (6) descends and covers the outside of the dynamic load module (31) through the lifting and lowering movement. The positioning mechanism between the outside of the light-shielding unit (6) and the dynamic load module (31) is used to perform secondary positioning of the dynamic load module (31), so that the display screen is fixed in the predetermined position for defect detection. S3. When the filter (421) below the lens module (411) switches between each other, the corresponding white LED array (501), red LED array (502), infrared LED array (503), and ultraviolet LED array (504) are lit when one of the filters (421) is below the lens module (411), and multiple photos of the display screen are taken continuously by the defect detection camera (4). S4. Through the lifting and lowering movement of the light-shielding unit (6) and the reciprocating movement of the baffle (71), the limit on the dynamic load module (31) is released at the same time. Using the reset mechanism between the right end of the static load module (33) and the right end of the dynamic load module (31), the dynamic load module (31) is driven to reset to the initial position and enter the next process.

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