Positioning jig and preparation method of display module

Abstract

According to the positioning jig and the manufacturing method of the display module, the positioning jig is used for manufacturing the display module, the inner peripheral side wall of the positioning jig can be in close fit with the outer peripheral side wall of a lamp bead, the outer peripheral side wall of the positioning jig can be in close fit with the side wall of a mask hole of a mask, the position of the mask is corrected, and the positioning accuracy of the display module is improved. The positioning error of the lamp panel and the mask is controlled within an extremely small range, so that the relative positions of the lamp beads and the cap peak structure of the mask are accurately locked, the difference that the cap peak shields light rays is prevented, the amount of direct light received by the surfaces of all the lamp beads is consistent, the visual difference that a multi-light-receiving area is brighter and a less-light-receiving area is darker is fundamentally eliminated, and the visual effect is improved. The mosaic effect is effectively avoided, and the display quality requirement of the display module under outdoor strong light is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display device, in particular to a positioning jig and a preparation method of display module. BACKGROUND

[0002] LED display screens are widely used in the display field due to their high brightness, low energy consumption, wide color gamut, unlimited splicing, and no splicing black line. The module of an outdoor LED display screen is usually composed of a bottom shell, a lamp panel, and a mask, and a complete display screen is formed by splicing multiple modules.

[0003] In an outdoor environment, the light is bright, and the outdoor LED display screen is required to have sufficient brightness to ensure clear and visible images and high contrast to accurately convey information. At the same time, the display surface of the display screen needs to be well protected in a harsh outdoor environment, and the ultraviolet rays in sunlight will have a strong attenuation effect on the lamp beads. To meet the above requirements, a high hat brim is usually designed on the mask to reduce the direct sunlight on the LED lamp beads, the surface of the mask is sprayed black to form a strong contrast with the light emitted by the LED lamp beads, and a diffuse reflection pattern is used to reduce the reflection of environmental light, thereby achieving the effects of protecting the LED lamp beads, avoiding direct sunlight, and improving the contrast.

[0004] However, the design of the mask brings new technical problems: if the relative position of the mask and the LED lamp beads is inconsistent, in the case of strong environmental light, black pictures or low-brightness pictures will appear with uneven blackness in units of masks, which is commonly known as the "mosaic" effect. The essence of this phenomenon is the positional offset of the LED lamp beads relative to the hat brim of the mask. Since the hat brim of the mask has a shielding effect on light, the offset will cause differences in the amount of direct light received by the surfaces of LED lamp beads at different positions; and the surface of the LED lamp bead is white or matte, which reflects light strongly, so the areas receiving more light appear brighter, and the areas receiving less light appear darker, ultimately forming a "mosaic" visual effect. Therefore, how to ensure the relative positional accuracy of the LED lamp beads and the hat brim of the mask and reduce the offset deviation becomes the core of solving this problem.

[0005] To solve the above position positioning problem, three main schemes are proposed in related technologies: 1. A positioning hole is provided on the bottom shell and penetrates the lamp panel, and a positioning column is provided on the mask, and assembly positioning is achieved by cooperation of the positioning column and the positioning hole. However, in this scheme, a certain assembly gap needs to be reserved between the PCBA and the bottom shell, and between the mask positioning column and the bottom shell positioning hole to ensure smooth assembly. These gaps will form a random cumulative tolerance band, causing the position of the LED lamp beads in the mask hole to be randomly offset, and the "mosaic" phenomenon cannot be effectively solved. 2. Set a positioning column on the lamp plate and a positioning hole on the mask to realize positioning through cooperation. This scheme avoids the assembly gap between the bottom shell and the PCBA, but the positioning column is usually welded on the PCB by copper column, which is easy to deviate during the SMT process, causing positioning deviation. In addition, the copper column welding thrust is usually below 10kg, and the thermal expansion and contraction of the mask in outdoor long-term use will cause the copper column to peel off from the PCB, causing water leakage and corrosion risk; 3. A convex point with elasticity is arranged on the opening of the mask, and positioning is realized by the contact of the convex point and the LED lamp bead. However, the mask and the LED lamp bead will be in direct contact after assembly, and the thermal expansion and contraction of the plastic material in the outdoor environment will easily form repeated thrust on the LED lamp bead, which is easy to cause the LED lamp bead to peel off from the solder pad, forming a product failure point.

[0006] It can be seen that the related technologies cannot simultaneously consider positioning accuracy, use safety and simple processing, and it is difficult to completely solve the "mosaic" phenomenon of outdoor LED display screens, and there are different degrees of safety hazards, so a new technical scheme is needed to solve the related problems. SUMMARY

[0007] The purpose of the present application is to solve the technical problems in the related art that the display screen preparation cannot simultaneously consider positioning accuracy, use safety and simple processing, and it is difficult to completely solve the "mosaic" phenomenon of outdoor LED display screens, and there are different degrees of safety hazards.

[0008] To solve the above technical problems, the present application provides a positioning jig for the preparation of a display module, the display module comprising a lamp plate and a mask fixed on the lamp plate, a plurality of lamp beads being arranged at intervals on the lamp plate, the mask being provided with a cover hole corresponding to the position of the lamp bead, and the lamp bead being arranged in the cover hole; The positioning jig is a groove structure with a jig opening on one side, the positioning jig is used to cover the outside of the lamp bead, one side end face of the positioning jig provided with the jig opening is used to abut on the surface of the lamp plate provided with the lamp bead, and the cover hole of the mask can be arranged outside the positioning jig; the inner peripheral side wall of the positioning jig corresponding to the jig opening can be tightly matched with the outer peripheral side wall of the lamp bead, and the inner peripheral side wall of the mask corresponding to the cover hole can be tightly matched with the outer peripheral side wall of the positioning jig.

[0009] In some embodiments of the present application, the positioning jig comprises a top plate and a positioning plate connected to the periphery of the top plate, four positioning plates are provided, one end of the positioning plate is connected to the side of the top plate, and the other end of the positioning plate is used to abut on the surface of the lamp plate, and the four positioning plates are arranged in central symmetry about the center of the top plate; When the positioning jig cover is arranged outside the lamp bead, the inner surface of the positioning plate is used to tightly fit with the outer sidewall of the lamp bead.

[0010] In some embodiments of the present application, the positioning jig further comprises a connecting plate arranged at the side edge of the top plate, four positioning plates are arranged at the circumferential side of the top plate, the connecting plate is arranged between two adjacent positioning plates, and the connecting plate is in an arc shape curved towards the central axis of the positioning jig; one end of the connecting plate is connected to the side edge of the top plate, and the other end of the connecting plate is enclosed with the end of the positioning plate away from the top plate to form the jig opening.

[0011] In some embodiments of the present application, the height of the connecting plate is less than the height of the positioning plate, and the end of the positioning plate corresponding to the jig opening protrudes outward beyond the end of the connecting plate corresponding to the jig opening.

[0012] In some embodiments of the present application, the top plate is provided with a taking and placing hole.

[0013] In some embodiments of the present application, the length and width of the lamp bead are A and B respectively, and the length and width of the cover hole are a and b respectively. The positioning plate comprises a first positioning plate symmetrically arranged on both sides of the length direction of the lamp bead and a second positioning plate symmetrically arranged on both sides of the width direction of the lamp bead, the thickness t1 of the first positioning plate is (1 / 2)(b-B)-2M, and the thickness t2 of the second positioning plate is (1 / 2)(a-A)-2M, wherein the size range of M is 0.005mm~0.02mm.

[0014] In some embodiments of the present application, the lamp pin part of the lamp bead is covered with glue, the glue forms a glue filling layer on the lamp plate, the height of the glue filling layer is D, the height of the lamp bead is C, and the height h of the positioning jig is not less than the difference between C and D.

[0015] The present application also provides a preparation method of a display module, comprising the following steps: providing the above positioning jig, the lamp plate provided with lamp beads, and the face cover provided with cover holes; selecting any one lamp bead on the lamp plate as a reference lamp bead, placing the positioning jig on the lamp plate and covering the outside of the reference lamp bead; placing the face cover on the surface of the lamp plate provided with lamp beads through the positioning jig, so that the inner wall of one cover hole abuts against the outer circumferential sidewall of the positioning jig, and the other remaining cover holes cover the outside of the corresponding lamp beads; fixing the face cover on the lamp plate and taking down the positioning jig.

[0016] In some embodiments of the present application, before the positioning jig is placed on the lamp panel, the preparation method further comprises the step of: providing a bottom shell, and placing the lamp panel provided with the lamp beads on the bottom shell.

[0017] In some embodiments of the present application, in the step of fixing the mask on the lamp panel, the mask is fixed on the lamp panel by a screw.

[0018] From the above technical solutions, the beneficial effects of the present application are: for the positioning jig and the preparation method of the display module of the present application, the positioning jig can be tightly matched with the outer peripheral side wall of the lamp bead through its inner peripheral side wall, and can be tightly matched with the side wall of the cover hole of the mask through its outer peripheral side wall, so as to correct the position of the mask, control the positioning error of the lamp panel and the mask within a very small range, accurately lock the relative position of the lamp bead and the brim structure of the mask, prevent the difference of the brim shielding light, make the amount of direct light received by the surface of all lamp beads consistent, eliminate the visual difference of the more light-receiving area and the less light-receiving area from the root, effectively avoid the "mosaic" effect, and meet the display quality requirement of the display module under outdoor strong light. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of an embodiment of the positioning jig of the present application.

[0020] Figure 2 is a sectional view of an embodiment of the positioning jig of the present application.

[0021] Figure 3 is a schematic diagram of the use state of an embodiment of the positioning jig of the present application.

[0022] Figure 4 is a structural schematic diagram of a lamp bead.

[0023] Figure 5 is a structural schematic diagram of another view direction of a lamp bead.

[0024] Figure 6 is a step flowchart of the preparation method of the display module of the present application.

[0025] Figure 7 is a schematic diagram of the operation flow of the preparation method of the display module of the present application.

[0026] The reference signs are explained as follows: 100, display module; 10, lamp panel; 20, mask; 21, cover hole; 30, lamp bead; 40, glue filling layer; 50, bottom shell; 60, screw; 200, positioning jig; 2001, jig opening; 201, top plate; 202, positioning plate; 2021, first positioning plate; 2022, second positioning plate; 203, connecting plate. DETAILED DESCRIPTION

[0027] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0028] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] See Figures 1 to 3 One embodiment of this application provides a positioning fixture 200 for the preparation of a display module 100. The display module 100 includes a lamp plate 10 and a mask 20 fixed on the lamp plate 10. A plurality of lamp beads 30 are spaced apart on the lamp plate 10. The mask 20 has a cover hole 21 at the position corresponding to the lamp beads 30, and the lamp beads 30 pass through the cover hole 21.

[0031] The positioning fixture 200 is a groove structure with a fixture opening 2001 on one side, and is used to cover the outside of the lamp bead 30. The end face of the positioning fixture 200 with the fixture opening 2001 is used to abut against the surface of the lamp plate 10 where the lamp bead 30 is located, and the cover hole 21 of the mask 20 can surround the outside of the positioning fixture 200. The inner peripheral sidewall of the positioning fixture 200 corresponding to the fixture opening 2001 can be tightly fitted with the outer peripheral sidewall of the lamp bead 30, and the inner peripheral sidewall of the mask 20 corresponding to the cover hole 21 can be tightly fitted with the outer peripheral sidewall of the positioning fixture 200.

[0032] The positioning fixture 200 of this application can be tightly fitted with the outer peripheral sidewall of the lamp bead 30 through its inner peripheral sidewall, and can also be tightly fitted with the sidewall of the cover hole 21 of the mask 20 to correct the position of the mask 20. This will control the positioning error between the lamp board 10 and the mask 20 to a very small range, thereby accurately locking the relative position of the lamp bead 30 and the cap structure of the mask 20. This will prevent the cap from blocking light differences and ensure that the amount of direct light received by the surface of all lamp beads 30 is consistent. This will eliminate the visual difference of brighter areas with more light and darker areas with less light from the root, effectively avoid the "mosaic" effect, and meet the display quality requirements of the display module 100 under strong outdoor light.

[0033] Furthermore, the positioning fixture 200 of this application achieves the positioning of the faceplate 20 and the light panel 10 without the need to drill holes in the bottom shell or set positioning posts on the faceplate 20, avoiding assembly gaps in the prepared display module 100 and preventing the LED beads 30 from shifting, thus fundamentally solving the "mosaic" effect. At the same time, the positioning fixture 200 of this application does not require welding any additional structures to the light panel 10 or the faceplate 20. After positioning is completed, the positioning fixture 200 can be directly removed, and the final product structure only retains the original assembly relationship of the light panel 10, the faceplate 20, and the bottom shell, effectively avoiding the risk of welded structure peeling, ensuring the sealing and protection performance of the outdoor module, and guaranteeing the reliability of the product.

[0034] In some embodiments of this application, the positioning fixture 200 may include a top plate 201 and positioning plates 202 connected to the periphery of the top plate 201. There are four positioning plates 202. One end of the positioning plate 202 is connected to the side of the top plate 201, and the other end of the positioning plate 202 is used to abut against the surface of the lamp panel 10. The four positioning plates 202 are arranged in a centrally symmetrical manner about the center of the top plate 201.

[0035] When the positioning fixture 200 is placed over the outside of the lamp bead 30, the inner surface of the positioning plate 202 is used to fit tightly against the outer wall of the lamp bead 30.

[0036] The four positioning plates 202 are arranged symmetrically in the center, which can form a uniform clamping force from four directions around the outer periphery of the lamp bead 30, avoiding the displacement of the lamp bead 30 caused by unilateral force, making the fit gap between the lamp bead 30 and the positioning plate 202 completely consistent, further reducing the deviation of the relative position, thereby ensuring the consistency of the relative angle and radial position of the lamp bead 30 and the brim of the mask 20, avoiding the difference in light received, and further consolidating the eradication effect of the "mosaic" effect.

[0037] In some examples, the ends of the positioning plates 202 can form abutment ends. The abutment ends of the four positioning plates 202 can simultaneously abut against the lamp board 10, forming a stable four-point support surface, ensuring that the positioning fixture 200 is perpendicularly attached to the surface of the lamp board 10, and avoiding positioning deviation caused by the tilt of the positioning fixture 200; at the same time, the four-point contact area is small and dispersed, and will not compress the circuits, pads and other components on the lamp board 10, ensuring the structural integrity of the lamp board 10.

[0038] like Figure 2 As shown in some embodiments of this application, the positioning fixture 200 further includes a connecting plate 203 disposed on the side of the top plate 201. Four positioning plates 202 are arranged at intervals around the periphery of the top plate 201, and a connecting plate 203 is provided between two adjacent positioning plates 202. The connecting plate 203 is arc-shaped and bends toward the central axis of the positioning fixture 200. One end of the connecting plate 203 is connected to the side of the top plate 201, and the other end of the connecting plate 203 and the end of the positioning plate 202 away from the top plate 201 enclose each other to form a fixture opening 2001.

[0039] The arc-shaped transition of the connecting plate 203 not only facilitates the processing of the positioning fixture 200, but also evenly transmits the clamping force during positioning along the outer periphery of the LED bead 30, avoiding stress concentration at the connection point of adjacent positioning plates 202 and reducing the risk of damage to the LED bead 30. Furthermore, the arc-shaped connecting plate 203 provides a certain amount of elastic buffer space, allowing for slight deformation during assembly to accommodate minor dimensional differences on the outer periphery of the LED bead 30. This ensures a tight fit with the positioning fixture 200 while preventing rigid compression from pulling on the solder pads of the LED bead 30, further reducing the risk of LED bead 30 peeling and meeting the reliability requirements for long-term outdoor use.

[0040] In some examples, the height of the connecting plate 203 is less than the height of the positioning plate 202, and the end of the positioning plate 202 corresponding to the fixture opening 2001 extends outward beyond the end of the connecting plate 203 corresponding to the fixture opening 2001.

[0041] Compared to the connecting plate 203, the end of the positioning plate 202 extends outward. This configuration allows the end of the positioning plate 202 to form a guide structure at the jig opening 2001, so that during assembly, the extending end of the positioning plate 202 can quickly guide the positioning jig 200 to be fitted onto the lamp bead 30 without special alignment, allowing the positioning jig 200 to be accurately positioned and covered on the outside of the lamp bead 30.

[0042] When the positioning fixture 200 is removed, the portion of the positioning plate 202 that extends beyond the end can form a guide, reducing the frictional resistance between the connecting plate 203 and the LED bead 30, making the positioning fixture 200 detach more smoothly, reducing the risk of accidental frictional damage to the surface of the LED bead 30 during the positioning process, and ensuring the reliability of the LED bead 30.

[0043] In some embodiments of this application, a pick-and-place hole can be provided on the top plate 201 of the positioning fixture 200. The pick-and-place hole can be the location where external force is applied to the positioning fixture 200, avoiding slippage and force deviation caused by directly gripping the positioning plate 202 or connecting plate 203 during pick-and-place operations, ensuring that the positioning fixture 200 is stably and accurately fixed on the lamp plate 10. During manual operation, the positioning fixture 200 can be easily fitted and removed by inserting fingers or tools, such as tweezers or a suction cup, into the hole, reducing the preparation time of the display module 100 and improving processing efficiency.

[0044] Furthermore, when the positioning fixture 200 is used to install the LED bead 30, the LED bead 30 and the interior of the positioning fixture 200 form a closed space. The inability of air to escape quickly will create resistance, resulting in uneven fixture fit or positioning misalignment. The pick-and-place hole can serve as an exhaust channel to quickly expel internal air, allowing the fixture to fit more tightly with the LED bead 30 and the lamp board 10, thus avoiding positioning errors caused by residual air.

[0045] In some examples, the positioning fixture 200 can be identified by the image recognition module, and then the positioning fixture 200 can be grasped and placed by the robotic gripper, so as to realize the automatic feeding, positioning and unloading of the positioning fixture 200 without the need for additional design of the adaptation structure, thereby improving the automation rate of the production line and achieving the efficiency requirements of mass production of display modules 100.

[0046] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the positioning plates 202 of the positioning fixture 200 can be symmetrically arranged on both sides of the length direction of the lamp bead 30 (first positioning plate 2021) and symmetrically arranged on both sides of the width direction of the lamp bead 30 (second positioning plate 2022). In this application, the length and width of the lamp bead 30 are A and B, respectively, and the length and width of the cover hole 21 are a and b, respectively.

[0047] For the positioning fixture 200 of this application, the thickness of the first positioning plate 2021 is t1=(1 / 2)(bB)-2M, and the thickness of the second positioning plate 2022 is t2=(1 / 2)(aA)-2M, wherein the size of M is in the range of 0.005mm~0.02mm.

[0048] In this application, the size of M ranges from 0.005mm to 0.02mm, which allows for reasonable compensation for tight fit. This ensures the tight fit between the positioning fixture 200 and the lamp bead 30 and the cover hole 21 through slight interference or gapless fit, effectively controlling the relative positional deviation between the lamp bead 30 and the brim of the mask 20, and avoiding the "mosaic" effect.

[0049] In this embodiment, the length and width of the positioning fixture 200 are L and W, respectively. Specifically, the length L of the positioning fixture 200 is a - 4M, and the width W is b - 4M.

[0050] This setting allows for the determination of the outer circumferential dimensions of the positioning fixture 200 by setting the size of the cover hole 21 and the compensation amount M, ensuring that the positioning fixture 200 can match the mask 20 of different batches with consistent fitting accuracy, effectively guaranteeing the reliability of the manufacturing and processing of the display module 100, and ensuring the production quality of the display module 100.

[0051] In some examples, such as Figure 5 As shown, the base of the LED bead 30 is covered with glue, and the glue forms a potting layer 40 on the lamp board 10. The height of the potting layer 40 is D, the height of the LED bead 30 is C, and the height h of the positioning fixture 200 is not less than the difference between C and D.

[0052] The potting layer 40 is a protective structure covering the lamp base. The effective positioning height of the lamp bead 30 beyond the potting layer 40 is the difference between C and D. Setting the height h of the positioning fixture 200 to be no less than the difference between C and D ensures that the inner surface of the top plate 201 in the positioning fixture 200 fully adheres to the top surface of the lamp bead 30 beyond the potting layer 40, forming a complete tight fit. This avoids a partially suspended state due to insufficient height of the positioning fixture 200, and also avoids an excessively large overall size due to excessive height of the positioning fixture 200, ensuring that the positioning fixture 200 covers the effective positioning area of ​​the lamp bead 30.

[0053] The height h of the positioning fixture 200 is set to be no less than the difference between C and D. The positioning fixture 200 can effectively cooperate with the lamp bead 30. During positioning assembly, the positioning fixture 200 is not prone to tilting or displacement, ensuring that the positioning fixture 200 is perpendicularly attached to the surface of the lamp board 10, further reducing the positioning deviation caused by the tilt of the positioning fixture 200, and improving the consistency of mass production of the display module 100.

[0054] See Figure 6 and Figure 7 An embodiment of this application also provides a method for manufacturing a display module 100, the method comprising the following steps: Step S10: Provide a positioning fixture 200, a lamp plate 10 with lamp beads 30, and a mask 20 with a cover hole 21. Step S20: Select any one of the lamp beads 30 on the lamp board 10 as the reference lamp bead 30, and place the positioning fixture 200 on the lamp board 10 and cover the outside of the reference lamp bead 30. In step S30, the mask 20 is placed on the surface of the lamp plate 10 where the lamp beads 30 are provided by the positioning fixture 200, so that the inner wall of one of the cover holes 21 abuts against the outer peripheral side wall of the positioning fixture 200, and the other remaining cover holes 21 cover the outside of the corresponding lamp beads 30. Step S40: Fix the mask 20 onto the lamp plate 10 and remove the positioning fixture 200.

[0055] The method for preparing the display module 100 of this application uses a positioning fixture 200 to achieve precise positioning of the lamp panel 10 and the mask 20, so as to effectively unify the relative positions of all the lamp beads 30 and the brim of the mask 20, thus avoiding the "mosaic" effect from the processing level.

[0056] With the positioning fixture 200, all the holes 21 of the mask 20 can be aligned with all the lamp beads 30 using the same reference, avoiding the problem of overall offset due to local alignment. This ensures the uniformity of the positioning accuracy of the mask 20 and the lamp board 10 in all mass-produced display modules 100, and ensures that there will be no visual discontinuity between display modules 100 after multiple display modules 100 are spliced ​​together, thus meeting the display requirements after the display screen is spliced.

[0057] Furthermore, the positioning fixture 200 only plays a positioning role before the mask 20 and the lamp board 10 are fixed. After the mask 20 is fixed, it can be removed. There will be no residual assembly stress inside the display module 100, which avoids the risk of long-term failure such as deformation of the mask 20 and peeling of the lamp beads 30 caused by thermal expansion and contraction in outdoor environment, and ensures the service life of the display module 100.

[0058] Furthermore, the positioning fixture 200 can be reused in different display modules 100 and different batches of production, eliminating the need to design a separate manufacturing process for each product, which greatly reduces the process debugging cost of new product development and the investment cost of the positioning fixture 200 in the mass production stage.

[0059] In step S10, the specific structure of the provided positioning fixture 200 has been described above and will not be repeated here.

[0060] In some examples, before step S20, a base shell 50 may be provided, on which the lamp board 10 with the LED beads 30 is placed. The base shell 50 can provide a flat and stable bearing surface for the lamp board 10 to a certain extent, preventing the lamp board 10 from bending or shifting due to its own flexibility or assembly operations, and ensuring that the plane where the LED bead array is located remains horizontal and in a fixed position.

[0061] Furthermore, the bottom shell 50 is one of the components of the display module 100. The lamp plate 10 is placed on the bottom shell 50 in advance, so that subsequent operations such as fixing the mask 20 and removing the positioning fixture 200 are all carried out on the basis of the pre-assembly formed by the bottom shell 50 and the lamp plate 10, avoiding the overall positional shift of the display module 100 caused by fixing the mask 20 first and then installing the bottom shell 50.

[0062] In some embodiments of this application, for step S40, after the mask 20 and the lamp board 10 are positioned, the mask 20 can be fixed to the lamp board 10 by screws 60.

[0063] In step S30, the positioning fixture 200 has precisely calibrated the relative position of the mask 20 and the lamp board 10. The screw 60 can lock this precise position, preventing the mask 20 from shifting slightly due to vibration or external force during the subsequent removal of the positioning fixture 200, handling or use of the display module 100. This ensures that the positional deviation between the lamp bead 30 and the brim of the mask 20 is always within the range calibrated by the positioning fixture 200, thereby effectively avoiding the "mosaic" effect of the display screen.

[0064] Regarding the positioning fixture and the manufacturing method of the display module in this application, the positioning fixture can achieve the correction of the mask position by tightly fitting its inner peripheral sidewall with the outer peripheral sidewall of the lamp bead, and by tightly fitting its outer peripheral sidewall with the sidewall of the mask hole. This controls the positioning error between the lamp board and the mask to a very small range, thereby accurately locking the relative position of the lamp bead and the mask brim structure. This prevents the brim from blocking light differences, ensuring that the amount of direct light received by all lamp bead surfaces is consistent. This eliminates the visual difference of brighter areas with more light and darker areas with less light from the root, effectively avoiding the "mosaic" effect and meeting the display quality requirements of the display module under strong outdoor light.

[0065] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A positioning fixture for manufacturing a display module, the display module comprising a lamp plate and a cover fixed on the lamp plate, the lamp plate having a plurality of lamp beads spaced apart, the cover having a cover hole at a position corresponding to the position of the lamp beads, the lamp beads passing through the cover hole; Its features are, The positioning fixture is a groove structure with a fixture opening on one side. The positioning fixture is used to cover the outside of the lamp bead. The end face of the positioning fixture with the fixture opening is used to abut against the surface of the lamp board where the lamp bead is located. The cover hole of the mask can surround the outside of the positioning fixture. The inner peripheral sidewall of the positioning fixture corresponding to the fixture opening can be tightly fitted with the outer peripheral sidewall of the lamp bead. The inner peripheral sidewall of the mask corresponding to the cover hole can be tightly fitted with the outer peripheral sidewall of the positioning fixture.

2. The positioning fixture according to claim 1, characterized in that, The positioning fixture includes a top plate and positioning plates connected to the periphery of the top plate. There are four positioning plates. One end of each positioning plate is connected to the side of the top plate, and the other end of each positioning plate is used to abut against the surface of the lamp panel. The four positioning plates are arranged in a centrally symmetrical manner about the center of the top plate. When the positioning fixture is placed over the outside of the lamp bead, the inner surface of the positioning plate is used to fit tightly against the outer wall of the lamp bead.

3. The positioning fixture according to claim 2, characterized in that, The positioning fixture also includes a connecting plate disposed on the side of the top plate. The four positioning plates are arranged at intervals around the periphery of the top plate, and a connecting plate is provided between two adjacent positioning plates. The connecting plate is in an arc shape that bends toward the central axis of the positioning fixture. One end of the connecting plate is connected to the side of the top plate, and the other end of the connecting plate and the end of the positioning plate away from the top plate enclose the fixture opening.

4. The positioning fixture according to claim 3, characterized in that, The height of the connecting plate is less than the height of the positioning plate, and the end of the positioning plate corresponding to the fixture opening extends outward beyond the end of the connecting plate corresponding to the fixture opening.

5. The positioning fixture according to claim 2, characterized in that, The top plate has a pick-up and drop-out hole.

6. The positioning fixture according to claim 2, characterized in that, The length and width of the lamp bead are A and B, respectively, and the length and width of the cover hole are a and b; The positioning plate includes a first positioning plate symmetrically arranged on both sides of the length direction of the lamp bead and a second positioning plate symmetrically arranged on both sides of the width direction of the lamp bead. The thickness of the first positioning plate is t1=(1 / 2)(bB)-2M, and the thickness of the second positioning plate is t2=(1 / 2)(aA)-2M, wherein the size of M ranges from 0.005mm to 0.02mm.

7. The positioning fixture according to claim 1, characterized in that, The base of the LED bead is covered with glue, which forms a potting layer on the LED board. The height of the potting layer is D, the height of the LED bead is C, and the height h of the positioning fixture is not less than the difference between C and D.

8. A method for manufacturing a display module, characterized in that, Includes the following steps: The positioning fixture as described in any one of claims 1-7, the lamp plate with lamp beads, and the face mask with openings are provided. Select any one LED on the LED board as the reference LED, place the positioning fixture on the LED board and cover the outside of the reference LED; The mask is placed on the surface of the lamp board with lamp beads by means of a positioning fixture, so that the inner wall of one of the cover holes abuts against the outer peripheral side wall of the positioning fixture, and the other remaining cover holes cover the corresponding lamp beads. Secure the mask to the light panel and remove the positioning fixture.

9. The preparation method according to claim 8, characterized in that, Before placing the positioning fixture on the lamp plate, the preparation method further includes the step of: providing a base shell and placing the lamp plate with lamp beads on the base shell.

10. The preparation method according to claim 8, characterized in that, In the step of fixing the mask to the light panel, the mask is fixed to the light panel with screws.

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