LED display screen production process adopting nanometer soaking technology

Abstract

The invention discloses an LED display screen production process adopting a nanometer soaking technology, and relates to the technical field of LED display screens. Comprising the following steps of nanometer soaking, surface mounting, plug-in, wave soldering, post soldering, testing, semi-finished product aging, module suite assembling and glue filling, finished product module aging, box body aging and packaging and warehousing. The process is simple, the production cost is reduced, the product quality is improved, the lamp surface is neat and consistent, the light-emitting angle is uniform, and the product performance is ensured. The structure surface frame and the mounting box body of the display screen are integrally combined; and during welding, the welding flatness is guaranteed, and installation and maintenance are easy.

Description

Technical Field

[0001] The invention relates to the technical field of LED display screens, and in particular to a production process of LED display screens using nano-immersion technology. Background Art

[0002] The LED display screen is an electronic display screen composed of LED dot matrices. It changes the screen display content format such as text, animation, pictures, and videos in a timely manner by turning on and off red and green light beads. The component display control is carried out through a modular structure. It is mainly divided into display modules, control systems, and power systems.

[0003] The existing LED display production process has process defects, which will lead to problems such as inconsistent lamp surface uniformity and uneven light emission, resulting in reduced product yield.

[0004] In summary, the present invention designs a production process for an LED display screen that can improve product quality. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a production process for an LED display screen using nano-immersion technology, which has a simple process, reduces production costs, improves product quality, makes the lamp surface neat and consistent, and has a uniform light-emitting angle, thereby ensuring product performance.

[0006] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a LED display screen production process using nano-immersion technology, comprising the following steps: nano-immersion → patch → plug-in → wave soldering → post-soldering → testing → semi-finished product aging → module kit assembly and glue filling → finished product module aging → box aging → packaging and warehousing.

[0007] Preferably, the nano-immersion refers to immersing various circuit boards (PCBA, FPC, etc.) or electronic components of LEDs in a perfluoropolymer resin solution to achieve waterproofing, moisture-proofing and rust-proofing.

[0008] Preferably, the patch: after the steel mesh is pressed into contact with the PCB, it is printed by a printer, and then the electronic components are attached to the PCB by a patch machine, and finally the components attached to the PCB board are fixed on the board by a reflow soldering machine.

[0009] Preferably, the plug-in unit: inserts the LED into the PCB according to the PCB packaging polarity.

[0010] Preferably, the wave soldering comprises: fixing the PCB on the product fixture so that the fixture is consistent with the product hole position to ensure the verticality of the lamp, spraying the flux evenly on the pads attached with the components, and soldering the components on the PCB board using a wave soldering machine.

[0011] Preferably, the post-welding: large components such as power sockets, input and output interface pin headers, electrolytic capacitors, etc. are welded manually, and the operating staff wear anti-static rings.

[0012] Preferably, the test is as follows: the board after post-soldering can be lit up through the system, and the test device must be used to detect whether there are dead lights or dark lights on the board; whether the electronic components are broken; whether there are cold solder joints or false solder joints on the components; and whether the signal timing is correct.

[0013] Preferably, the semi-finished product aging is as follows: the tested products are centrally lit up to judge the quality of the entire screen.

[0014] As a preferred method, the module kit assembly and glue pouring: the tested module is assembled on the bottom shell and the mask. For outdoor products, glue pouring is required for waterproofing, so the bottom shell of the module should be assembled first, and then the glue pouring group is turned to pour glue, and after the glue is dry, the module mask is installed. Then the electronic potting glue is used to pour the glue on the surface of the module.

[0015] Preferably, the finished product module aging is performed by gathering the modules that have been glued and assembled into a kit together and lighting them up for testing.

[0016] As a preferred method, the cabinet aging is as follows: splicing the cabinets; connecting the power lines; connecting the signal lines between the cabinets; connecting the system lines; testing before powering on (whether there is a short circuit between the power supply and the module); powering on, and debugging the system to deal with problems.

[0017] Beneficial effects of the invention: The invention has a simple process, reduces production costs, improves product quality, and has a uniform light surface and a uniform light-emitting angle, thereby ensuring product performance. The structural surface frame and the installation box of the display screen are completely combined; during welding, the flatness of the welding is ensured, and installation and maintenance are easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments;

[0019] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] Reference Figure 1 , this specific implementation adopts the following technical solution: A LED display screen production process using nano-immersion technology, including the following steps:

[0022] 1. Nano-immersion: refers to the immersion of various circuit boards (PCBA, FPC, etc.) or electronic components of LED in perfluoropolymer resin solution to achieve waterproof, moisture-proof and rust-proof.

[0023] 2. Patch: After the steel mesh is pressed against the PCB, it is printed by a printer, and then the electronic components are attached to the PCB by a patch machine. Finally, the components attached to the PCB are fixed on the board by a reflow soldering machine;

[0024] 3. Plug-in: Insert the LED into the PCB according to the PCB package polarity;

[0025] 4. Wave soldering: Fix the PCB on the product fixture so that the fixture is consistent with the product hole position to ensure the verticality of the lamp, spray the flux evenly on the pads where the components are attached, and use the wave soldering machine to solder the components on the PCB board;

[0026] 5. Post-welding: Large components such as power sockets, input and output interface pins, electrolytic capacitors, etc. are welded manually, and the operators wear anti-static rings;

[0027] 6. Test: After the post-welding board passes through the system, it can be lit. The test device must be used to detect whether there are dead lights or dark lights on the board; whether the electronic components are broken; whether there are cold soldering or false soldering on the components; whether the signal timing is correct;

[0028] 7. Aging of semi-finished products: Light up the tested products together to judge the quality of the entire screen.

[0029] 8. Module kit assembly and glue pouring: Install the tested module on the bottom shell and mask. For outdoor products, glue pouring is required for waterproofing, so the bottom shell of the module must be installed first, and then the glue pouring group is used for glue pouring. After the glue is dry, the module mask is installed. Then use electronic potting glue to pour the glue on the surface of the module.

[0030] 9. Finished module aging: Gather the modules that have been filled with glue and assembled into the kit together and light them up for testing;

[0031] 10. Cabinet aging: Splice the cabinets; connect the power cord; connect the signal lines between cabinets; connect the system lines; check before powering on (whether there is a short circuit between the power supply and the module); power on and debug the system to deal with problems;

[0032] 11. Packing and storage.

[0033] In this specific implementation method, when patching, the steel mesh is made according to the driving surface of the product to be produced, and its purpose is to fix the driving component to the PCB. There are two types of steel meshes: red glue and solder paste. The red glue steel mesh is used to fix the component on the board and solder the component to the PCB through wave soldering. The solder paste steel mesh is used to solder the component attached to the board to the PCB through a reflow soldering machine. The PCB printed by the red glue steel mesh must be wave soldered, while the PCB printed by the solder paste steel mesh does not need to be wave soldered. The thickness of the steel mesh is generally: 0.18MM for red glue and 0.15MM for solder paste. Printing machine: evenly apply red glue or solder paste on the PCB, and press the steel mesh and PCB in good contact; ensure uniform thickness of the printed surface. SMT machine: attach electronic components to the PCB, and the pins of the components must be aligned with the pad package pins; reflow soldering machine: fix the components attached to the PCB on the board. Both red glue and solder paste are semi-solid when printed. Through reflow soldering, the red glue solidifies and the components are glued to the PCB; while the solder paste can be melted through reflow soldering, thereby soldering the components to the PCB.

[0034] The wave soldering of this specific implementation method must ensure the verticality of the lamp, because the light of the lamp is generated by the surface chip, and the deviation of the lamp will cause the deviation of the light intensity and angle. As a result, the light of the display screen is uneven, causing the deviation of the color at each angle, and the effect and quality of the displayed image are reduced. Therefore, the verticality of the lamp must be ensured during wave soldering.

[0035] The aging of semi-finished products in this specific implementation is very important for mass production. When semi-finished products are aging, the entire production can be evaluated, quality problems in the production process can be discovered, and solved in a timely manner, thereby improving production quality, ensuring product reliability, and reducing risks.

[0036] When assembling the module of this specific implementation, it is necessary to ensure the verticality of the lamp to avoid the lamp deviating due to human factors. At the same time, when assembling, pay attention to the strength of the electric screwdriver to avoid damaging the bottom shell and mask of the module due to excessive force.

[0037] When producing outdoor waterproof products, it is necessary to pour glue on the surface of the module to achieve waterproof effect. Generally, electronic potting glue is used, which has A\B types. Mix them in a ratio of 10:1 and pour the glue on the surface of the module manually or automatically by machine. The A\B glue should be mixed evenly, and the amount of glue poured should be moderate, not too little or too much. Too little will not be waterproof well, and too much will affect the light-emitting angle of the lamp and the assembly of the mask.

[0038] The aging of finished modules mainly involves an overall evaluation of the screen, such as the life and attenuation of the lamp, the color difference of the screen, the white balance effect, the display angle, the quality of the displayed images, etc.

[0039] The box assembly process of this specific implementation method is as follows:

[0040] 1. Install the module on the box;

[0041] 2. Connect the signal cables between modules;

[0042] 3. Connect the module 5V power line;

[0043] 4. Install the power supply and connect the 5V power cable on the module to the power supply;

[0044] 5. Connect the 220V power cord in the power room. If there are fans and aviation sockets, connect them together.

[0045] 6. Install the system, connect the system output to the module, and connect the 5V power cord to the system;

[0046] Things to pay attention to when assembling the cabinet: the flatness of the module; control of the length of the power cord and signal line, under the premise of meeting the needs, the line should be as short as possible (to reduce the voltage drop and signal attenuation on the line, and save materials at the same time); the polarity of the power cord is distinguished, the power cord has positive and negative poles, and the positive and negative poles cannot be reversed between modules, modules and power supplies, and power supplies; the system output line and the input and sequence of the module signal cannot be reversed.

[0047] The box needs to be tested for vibration and waterproof before aging. The vibration test is mainly to test whether the components are firmly installed, and the waterproof test is mainly to check whether the waterproof rubber ring of the module is well installed and whether there are any screws missing in the module.

[0048] Embodiment 1: A production process of an LED display screen using nano-immersion technology, comprising the following steps:

[0049] 1. Raw material procurement: select quality suppliers and ensure that the products pass strict certification management;

[0050] 2. Material acceptance: Acceptance according to national standards, return unqualified products, and control the unqualified rate;

[0051] 3. Material storage: Classify according to standards and take moisture-proof and other measures to ensure material quality;

[0052] 4. First sample production and inspection: Make the first sample, pass the brightness test, determine the white balance, and product test;

[0053] 5. Mix lamps, plug in lamps, check plug-in, cut pins, weld, post-weld, and post-weld inspection;

[0054] 6. Press the lamp to check tin;

[0055] 7. Board washing, appearance inspection, spraying three waterproof, applying glass glue, installing the bottom shell, assembly, pre-test, aging test, whole lamp, glue filling, mask installation, module post-test;

[0056] 8. Packing, whole screen debugging, whole screen aging;

[0057] 9. Performance inspection;

[0058] 10. Water immersion test;

[0059] 11. Packaging, packaging inspection, warehousing, shipment inspection, and shipment.

[0060] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A production process for LED display screens using nano-immersion technology, characterized in that: The following steps are involved: Nano-immersion → SMD → plug-in → wave soldering → post-soldering → testing → semi-finished product aging → module kit assembly and glue filling → finished product module aging → box aging → packaging and warehousing; the nano-immersion refers to the immersion of various circuit boards or electronic components of LEDs in a perfluoropolymer resin solution.

2. The LED display screen production process using nano-immersion technology according to claim 1 is characterized in that: The patch is: the steel mesh is pressed into contact with the PCB and then printed by a printing machine, and then the electronic components are attached to the PCB by a patch machine, and finally the components attached to the PCB are fixed on the board by a reflow soldering machine.

3. The LED display screen production process using nano-immersion technology according to claim 1 is characterized in that: The plug-in described is to insert the LED into the PCB according to the PCB packaging polarity.

4. The LED display screen production process using nano-immersion technology according to claim 1 is characterized in that: The wave soldering process includes fixing the PCB on the product fixture so that the fixture is consistent with the product hole position to ensure the verticality of the lamp, spraying the flux evenly on the pads with components attached, and soldering the components on the PCB board using a wave soldering machine.

5. The LED display screen production process using nano-immersion technology according to claim 1 is characterized in that: The post-welding: the power socket, input and output interface pins, and large electrolytic capacitor components are welded manually, and the operating staff wears an anti-static ring.

6. The LED display screen production process using nano-immersion technology according to claim 1 is characterized in that: The test described above: the board after post-soldering can be lit up through the system, and the test device must be used to detect whether there are dead lights or dark lights on the board; whether the electronic components are broken; whether there are cold solder joints or false solder joints on the components; and whether the signal timing is correct.

7. The LED display screen production process using nano-immersion technology according to claim 1 is characterized in that: The semi-finished product aging described above: the tested products are lighted up together to judge the quality of the entire screen.

8. The LED display screen production process using nano-immersion technology according to claim 1 is characterized in that: The module kit assembly and glue pouring are as follows: the tested module is assembled onto the bottom shell and the mask; for outdoor products, glue pouring is required for waterproofing, so the bottom shell of the module must be installed first, and then the glue pouring group is turned to glue pouring, and after the glue is dry, the module mask is installed; and then the electronic potting glue is used to pour the glue onto the surface of the module.

9. The LED display screen production process using nano-immersion technology according to claim 1 is characterized in that: Finished product module aging: The modules that have been glued and assembled into the kit are gathered together and lit up for testing.

10. The LED display screen production process using nano-immersion technology according to claim 1, characterized in that: The cabinet aging mentioned above: splice the cabinets; connect the power cord; connect the signal cord between cabinets; connect the system cord; and perform a test before powering on; After powering on, a problem occurred in the system debugging process.

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