How to strengthen the protection level of LED display

　　For ordinary indoor LED displays, the products are delivered with zero failure. However, after a period of use, the lights will be broken and lit, and the lights will be lost due to accidental collision; In the field environment of installation, sometimes unpredictable or undesirable scenarios may occur. For example, the impact of temperature difference caused by direct blowing of air conditioner vents in a short distance may cause large area of bad points, or the field environment is too humid, which may cause the bad point rate of the screen to rise day by day.

　　Bad short circuit and column lighting of LED display screen

　　For the indoor small space industry that passes the semi annual patrol inspection, how to solve the display screen problems caused by factors such as moisture, dust, bump, and bad light rate, and how to improve product quality and reduce the burden and cost of after-sales service are the problems that LED manufacturers want to solve at present.

　　Therefore, in order to effectively solve the problems mentioned, the so-called surface coating solution is generated.

　　Process Diagram of Surface Coating

　　This solution is based on the current indoor surface mounted LED display screen, and the equipment can be directly combined with the existing SMT surface mounted production line.

　　The process is to cover the surface of the lamp plate made by surface mounting (SMT) process after 72 hours of aging to form a so-called protective layer, which can wrap the conductive pins and insulate them from moisture and moisture.

　　For LED display products with a general protection level of IP40 (IPXX, front X dust-proof, rear X waterproof), it has the advantages of effectively improving the protection level of the LED light surface, providing anti-collision effect, avoiding the occurrence of light loss, and reducing the overall screen failure rate (PPM). At present, such solutions have met the market demand, are mature in production, and will not unduly increase the overall cost burden.

　　In addition, the protection process on the back of the printed circuit board (PCB) can improve the protection level of the back of the circuit board by maintaining the three proofing paint protection process used in the past (as shown in Figure 4), generally by spraying the process, and coating the surface of the integrated circuit (IC) to form a protective layer to avoid the failure of the integrated circuit components of the drive circuit.

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