The first point: the excellent quality of the cable:
There are many connecting lines inside the outdoor large screen, such as the power line between the power supplies, the power line from the system card to the power supply, the power line from the module to the power supply, and the network cables and cables for signal transmission. The more electricity is used, the more wires inside. There are also higher requirements for the electrical stability of the wire. In many wire products, the use of wires that meet the requirements of the national standard can ensure their safety and stability. There are three requirements: the wire core is a copper wire conductive carrier, the cross-sectional area tolerance of the wire core is within the standard size value, and the insulation of the rubber wrapping the wire core. And the flame retardancy reaches the standard, compared with the general copper-clad aluminum wire core, the wire core has a small cross-sectional area, and the insulating rubber grade is not enough, the power-on performance is more stable, and it is not easy to cause a short circuit;
The second point: the switching power supply should be of high quality and should not be overloaded during use. The switching power supply is AC 220V to DC 5V to supply power to the screen. Under normal conditions, the use should not exceed 80% of the power supply. For risky work, under the condition of hot external environment temperature, it is more necessary to keep the power supply running in a stable state; in some projects, in order to reduce the cost of outdoor LED flexible transparent screen, the use of power supply is reduced, which makes the power supply overloaded. In fact, this is a very risky job.
The third point: In terms of the material of the external protective structure of the outdoor display screen, most of the display screen products with high fire rating on the market are made of fire-resistant aluminum-plastic panels, which have excellent fire resistance, fire resistance and flame retardancy, and special materials for core materials. Oxygen aging performance is also very strong, melting point temperature 135 ℃, decomposition temperature ≥ 300 ℃, environmental protection performance, low smoke and halogen free, in line with SGS flame retardant B-S1, d0, t0, refer to the application specification UL94, GB/8624-2006. The aluminum-plastic panels of general outdoor display products age faster with high temperature, rain and cold and thermal shocks, so that in relatively humid climates, rain and dew easily enter the interior of the screen, resulting in short-circuiting of electronic components and causing fires;
Fourth point: Another important part of the fireproof material of the display screen is the plastic kit. The plastic kit is mainly the application data of the unit module mask bottom shell. The main material used is PC+glass fiber material with flame retardant function, which not only has flame retardant function, but also can not deform, become brittle and crack under high and low temperature and long-term use, and is used in combination with glue with better sealing performance. , which can effectively prevent the rainwater from the external environment from penetrating into the interior and cause a short circuit to cause a fire.
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