Display module defect detection device based on aoi

Abstract

The utility model relates to display module defect detection equipment technical field provides a kind of display module defect detection device based on AOI, comprising: dark box;Three-way transmission mechanism is located in the dark box interior, including installation in the input transmission belt and output transmission belt of dark box both ends, still include installation in the dark box side surface substandard product transmission belt;Conveying positioning mechanism, including rotating upright and multiple positioning table, the positioning table is equipped with the clamping plate that can be moved oppositely;Image acquisition detection unit includes image acquisition part and bar light source, the image acquisition part is located in the other side of dark box, the bar light source is installed on the side wall of dark box, oblique oppositely on display module. Through the butt joint of three-way transmission mechanism and positioning conveying mechanism, combine the camera of AOI system and the light source of characteristic angle installation, the continuity defect detection operation of display module is realized, can clearly capture the light leakage of photosensitive hole, and form automatic sorting.

Description

Technical Field

[0001] This utility model relates to the technical field of display module defect detection equipment, and more specifically, to an AOI-based display module defect detection device. Background Technology

[0002] A display module is a display component of a monitor. Its cover plate usually has a light-sensing hole, which is mainly used to sense the intensity of ambient light in order to realize automatic adjustment of screen brightness. In order to avoid the light emitted by the backlight and the display glass from interfering with the normal operation of the light-sensing hole sensor, the current practice is to attach a black light-shielding paper to the top of the backlight to block the light shining from below onto the light-sensing hole.

[0003] To prevent products with light leakage from reaching customers, it is now generally required that light leakage testing be performed on this area before the product leaves the factory.

[0004] Current testing methods mainly rely on manual handheld modules to visually inspect the top for light leakage under specific lighting conditions. This manual operation method is not only labor-intensive and inefficient, but also susceptible to factors such as human fatigue and subjective judgment differences, which can easily lead to missed detections or misjudgments, becoming a bottleneck restricting production efficiency and quality stability. Utility Model Content

[0005] The purpose of this invention is to provide an AOI-based display module defect detection device to solve the problem of low efficiency of manual inspection in the prior art.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] An AOI-based display module defect detection device includes: a dark box;

[0008] The three-way transmission mechanism located inside the dark box includes an input transmission belt and an output transmission belt installed at both ends of the dark box, and also includes a defective transmission belt installed on the side of the dark box.

[0009] The conveying and positioning mechanism includes a rotating column and multiple positioning platforms, wherein the positioning platforms are provided with clamps that can move in opposite directions.

[0010] The image acquisition and detection unit includes an image acquisition unit and a bar light source. The image acquisition unit is located on the other side of the dark box, and the bar light source is installed on the side wall of the dark box and tilted towards the display module.

[0011] Preferably, a fixed frame is fixedly connected between the positioning platform and the rotating column of the conveying positioning mechanism, and the conveying positioning mechanism rotates intermittently at fixed intervals.

[0012] Preferably, one end of the positioning platform is fixed with an upwardly extending vertical plate at the connection point with the fixing frame, which is used to position the display module.

[0013] Preferably, the positioning platform has a sliding track inside, forming a through-type structure.

[0014] Preferably, the clamping plate is equipped with a slide rail via a connecting plate at its lower end, and the connecting plate is slidably installed inside the slide rail.

[0015] Preferably, one end of the positioning platform is provided with a ball screw structure for driving adjacent carriages to move in opposite directions.

[0016] Preferably, the other end of the positioning platform is an arc-shaped groove that fits the arc-shaped surface of the input transmission belt, output transmission belt, or defective transmission belt.

[0017] The beneficial effects of this utility model are:

[0018] 1. By integrating the dark box with the conveying and positioning mechanism and the image acquisition mechanism arranged at a specific angle, and by utilizing the arrangement of light sources at a specific angle, the effect of quickly detecting light leakage from the photosensitive hole of the display module is achieved. At the same time, it avoids glare caused by the light source shining directly into the lens, which helps to clearly capture the light leaking from the photosensitive hole and improves the quality of the detection operation.

[0019] 2. By using the rotary multi-station index structure of the conveyor positioning mechanism, the four processes of loading, inspection, unloading and sorting are integrated into a continuous rotation cycle for parallel operation, achieving near-seamless continuous operation and helping to improve overall work efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model 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.

[0021] Figure 1 This is a schematic diagram of the overall appearance structure of this utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of the internal structure of the dark box in the image;

[0023] Figure 3 for Figure 1 A schematic diagram of the transmission and positioning mechanism in the diagram;

[0024] Figure 4 for Figure 1 A schematic diagram of the bottom structure of the positioning platform in the diagram;

[0025] The attached diagram lists the components represented by each number as follows:

[0026] In the diagram: 1. Dark box; 21. Input transmission belt; 22. Output transmission belt; 23. Defective product transmission belt; 3. Image acquisition and detection unit; 31. Image acquisition unit; 32. Strip light source; 4. Conveying and positioning mechanism; 41. Fixing frame; 42. Positioning platform; 421. Slide rail; 422. Arc groove; 43. Clamping plate; 431. Carriage. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "opening", "top and bottom", "thickness", "top", "middle", "length", "inner" and "around" indicate the orientation or positional relationship only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] To overcome the limitations of manual inspection, automated optical inspection (AOI) technology has been introduced into the field of industrial inspection. Existing AOI equipment typically uses high-resolution industrial cameras to capture product images and uses image processing algorithms to automatically identify and locate defects (such as scratches, dirt, discoloration, etc.).

[0030] An AOI-based display module defect detection device is designed for rapid detection of light leakage defects in the photosensitive holes of display modules. Through the four-station rotation index of the transmission positioning mechanism, the display modules can be continuously loaded, unloaded, inspected and sorted at different stations. At the same time, by using a light source at a specific angle in combination with a camera, the camera of the AOI system can clearly capture the light leakage photosensitive holes, thus achieving efficient operation of light leakage detection of the photosensitive holes of display modules.

[0031] In some embodiments, the specific structure of the AOI-based display module defect detection device is as follows: Figure 1-4 As shown, it includes a dark box 1, a three-way transmission mechanism, and a transmission and positioning mechanism 4, as well as an image acquisition and detection unit 3;

[0032] Dark Box 1 is a sealed box whose inner walls are coated with black light-absorbing material to block out all external ambient light.

[0033] The three-way transmission mechanism includes an input drive belt 21, an output drive belt 22, and a defective drive belt 23;

[0034] The input drive belt 21 and the output drive belt 22 are located at the entrance and exit of the dark box 1, and the defective drive belt 23 is located on the side of the dark box 1.

[0035] The conveying and positioning mechanism 4 is located between the input drive belt 21 and the output drive belt 22, and has a rotating column with a central intermittent rotational motion;

[0036] Among them, four positioning platforms 42 are installed on the outside of the conveying and positioning mechanism 4, corresponding to the input transmission belt 21, the output transmission belt 22 and the defective transmission belt 23, as well as the image acquisition and detection unit 3 installed on the side of the dark box 1.

[0037] Furthermore, the image acquisition and detection unit 3 is located on the side of the dark box 1 away from the defective product conveyor belt 23, and includes a raised image acquisition unit 31 and an obliquely mounted strip light source 32;

[0038] Among them, the bar light source 32 emits oblique light to cover the display module on the positioning platform 42, in order to prevent glare from direct light shining on the image acquisition unit 31;

[0039] It should be noted that the image acquisition unit 31 is connected to an image processing unit (not shown in the figure); during detection, the image acquisition unit 31 acquires an image of the photosensitive hole area of ​​the display module and transmits it to the image processing unit. The image processing unit analyzes the brightness information of the area to determine whether its brightness value exceeds a preset threshold; if it exceeds the threshold, it is determined to be a light leakage defect and a defective product signal is sent to the control system.

[0040] Understandably, when a display module is marked as defective, the positioning table 42 will move the display module to the defective conveyor belt 23 before unloading it.

[0041] like Figure 3 and Figure 4 As shown, the positioning platform 42 is fixedly connected to the rotating column at the center of the conveying positioning mechanism 4 via a fixed frame 41 on one side;

[0042] Among them, sliding clamping plates 43 are installed on the top of the positioning platform 42, and are distributed in pairs on both sides of the positioning platform 42 for clamping the display module.

[0043] Furthermore, the positioning platform 42 has a slide rail 421 inside, and the lower end of the clamping plate 43 has a slide frame 431. The connecting plate between the clamping plate 43 and the slide frame 431 is slidably installed inside the slide rail 421.

[0044] It should be noted that a swivel sleeve is fixedly installed at one end of the slide 431, and a ball screw driven by a small rotary motor (the small rotary motor is installed inside the bearing seat at the bottom of the positioning table 42) is installed at the bottom of one end of the positioning table 42. The ball screw is connected to the swivel sleeve, and the two ends of the ball screw rotate in opposite directions to drive the adjacent clamping plate 43 to move in the opposite direction at the same time.

[0045] like Figure 2 and Figure 4 As shown, the input drive belt 21, the output drive belt 22, and the defective drive belt 23 are located at one end inside the dark box 1, and the frames on both sides are tapered structures with semi-circular structures at the tapered corners.

[0046] It is understandable that the input drive belt 21, the output drive belt 22, and the defective drive belt 23 are located inside the dark box 1, and their upper ends are unobstructed.

[0047] One end of the positioning table 42 is machined with an arc-shaped groove 422, which is used to fit the arc-shaped surfaces of the input transmission belt 21, the output transmission belt 22 and the defective transmission belt 23, and the positioning table 42 is flush with the upper surfaces of the input transmission belt 21, the output transmission belt 22 and the defective transmission belt 23.

[0048] It is understandable that the upper surfaces are flush with each other and the arc-shaped surface and the arc-shaped groove 422 are connected to reduce the obstruction when the display module enters the positioning stage 42.

[0049] In addition, a section of the body of the positioning platform 42 near one end of the arc groove 422 is made of elastically deformable silicone rubber, which can shrink and deform inward when it contacts the input transmission belt 21, output transmission belt 22 and defective transmission belt 23 during rotation, thus preventing jamming.

[0050] In this embodiment, a control system (not shown in the figure) is provided outside or inside the dark box 1. The control system can be a PLC or an industrial computer.

[0051] The control system is electrically connected to the drive motors of the input transmission belt 21, the output transmission belt 22, the defective product transmission belt 23, the rotary motor of the transmission and positioning mechanism 4, the small rotary motor of the positioning table 42, and the image acquisition and detection unit 3.

[0052] The control system is used for:

[0053] Control the transmission and positioning mechanism 4 to perform intermittent fixed-distance rotation;

[0054] Receive the defect judgment signal sent by the image acquisition and detection unit 3;

[0055] Based on the judgment signal, control the corresponding positioning table 42 to rotate above the output transmission belt 22 or the defective product transmission belt 23 for unloading;

[0056] The positioning platform 42 may be equipped with a position sensor (not shown in the figure) to detect whether the display module is in position and to feed the signal back to the control system.

[0057] In some publicly available publications, the specific usage methods of AOI-based display module defect detection devices are as follows:

[0058] S1, the display module is placed on the upper part of the input transmission belt 21 and transported into the dark box 1. The display module is blocked by the upright plate extending upward from one end of the positioning table 42.

[0059] S2. Drive a small rotary motor, and use the two sections of the ball screw with opposite rotation directions to drive the adjacent clamping plates 43 to move closer together through the slide 431, thereby clamping the display module and fixing it.

[0060] S3. The rotating motor inside the drive transmission and positioning mechanism 4 drives the positioning stage 42 to rotate via the fixed frame 41, so that the display module to be tested moves to the direct below the image acquisition and detection unit 3.

[0061] S4. The bar light source 32 emits tilted light to cover the display module, and the image acquisition unit 31 of the AOI system performs defect detection and marks the unqualified products.

[0062] S5. Drive the transmission and positioning mechanism 4 to rotate the positioning table 42, so that the detected display module moves to the top of one end of the output transmission belt 22, release the clamping and fixing of the clamping plate 43, and under the frictional force, the output transmission belt 22 drives the display module to move out.

[0063] S6. When the display module is marked as a defective product, the corresponding clamp 43 is released from the top of one end of the defective conveyor belt 23, and the display module is removed from the defective conveyor belt 23 to form a sorting process.

[0064] 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 present 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.

[0065] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model 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 this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An AOI-based display module defect detection device, characterized in that, include: The black box (1); The three-way transmission mechanism located inside the dark box (1) includes an input transmission belt (21) and an output transmission belt (22) installed at both ends of the dark box (1), and also includes a defective transmission belt (23) installed on the side of the dark box (1). The conveying positioning mechanism (4) includes a rotating column and multiple positioning platforms (42), and the positioning platforms (42) are provided with clamps (43) that can move in opposite directions. The image acquisition and detection unit (3) includes an image acquisition unit (31) and a bar light source (32). The image acquisition unit (31) is located on the other side of the dark box (1), and the bar light source (32) is installed on the side wall of the dark box (1) and tilted towards the display module.

2. The AOI-based display module defect detection device according to claim 1, characterized in that: A fixed frame (41) is fixedly connected between the positioning platform (42) and the rotating column of the conveying positioning mechanism (4), and the conveying positioning mechanism (4) rotates intermittently at a fixed distance.

3. The AOI-based display module defect detection device according to claim 2, characterized in that: The positioning platform (42) has a vertical plate at one end, the inner side is used for limiting the display module, and the outer side is connected to the fixing frame (41).

4. The AOI-based display module defect detection device according to claim 1, characterized in that: The positioning platform (42) has a slide (421) inside, which is a through structure.

5. The AOI-based display module defect detection device according to claim 4, characterized in that: The clamp (43) is fitted with a slide (431) via a connecting plate at its lower end, and the connecting plate is slidably installed inside the slide rail (421).

6. The AOI-based display module defect detection device according to claim 5, characterized in that: One end of the positioning platform (42) is provided with a ball screw structure, which is used to drive the adjacent slide (431) to move in opposite directions.

7. The AOI-based display module defect detection device according to claim 1, characterized in that: The other end of the positioning platform (42) is an arc groove (422) that fits into the arc surface of the input transmission belt (21), output transmission belt (22), or defective transmission belt (23).

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