Analysis of Hidden Dangers of Outdoor LED Electronic Display

As a new type of outdoor advertising carrier, outdoor LED electronic display has become a new highlight of urban outdoor advertising with its superior visual sensory characteristics. China's LED display industry has gone through 20 years of wind and rain. Today, the quality of LED displays produced in China has been recognized by the global market.

However, the problem of outdoor LED electronic display security risks, especially the LED display fire safety application technology is the focus. At the same time of the rapid development of this industry, there are still shortcomings in the field of LED display security application technology.

The quality of LED display fire protection technology is mainly related to the display fireproof raw materials and cabinet technology.

The fireproof raw materials mainly include the wire, power supply, external protective structure fireproof material and plastic kit inside the LED display screen:

1. In most display applications, the larger the unit area display of the LED display, the higher the power consumption, and the higher the requirements for the power supply stability of the wire. Among the many wire products, the wire that meets the requirements of the national standard can guarantee its safety and stability. There are three requirements: the wire core is a copper wire conductive carrier, the wire core cross-sectional area tolerance is within the standard range value, and the rubber core of the wrapped wire core is insulated. And the flame retardancy reaches the standard. Compared with the general copper clad aluminum wire core, the wire core cross-sectional area is small, and the insulation rubber grade is not enough, the electric current performance is more stable, and the short circuit condition is not easy to occur.

2. UL-certified power products are also the best choice when choosing the same kind of products. The effective conversion rate can ensure the safety and stability of the power supply load, and it can work normally even under the hot external environment.

3. in the material of the external protective structure of the LED display screen, the display products with higher fireproof rating on the market mostly adopt fireproof aluminum-plastic composite board, which has excellent fire resistance and strong fireproof and flame retardant. Oxygen aging performance is also very strong, melting point temperature 135 ° C, decomposition temperature ≥ 300°C, environmental performance, low smoke and halogen free, in line with SGS, flame retardant B-S1, d0, t0, reference standard UL94, GB/8624-2006 . The aluminum-plastic panel of the general outdoor LED display product is aging faster with high temperature and rain and hot and cold impact, so that in the relatively humid climate season, the rain dew easily penetrates into the screen body and causes short circuit of the electronic component to cause fire.

4. LED display fireproof raw materials also has an important part, that is, the plastic kit. The plastic kit is mainly used for the unit module cover bottom case. The main raw material used is PC fiberglass material with flame retardant function. It is not only flame retardant, but also can be deformed at high and low temperatures and long-term use without cracking and cracking. At the same time, combined with the glue with better sealing performance, it can effectively block the rainwater from the external environment from penetrating into the interior and causing a short circuit to cause fire.

In addition to the internal raw materials that affect fire protection, external configuration and design are also very important. However, the external configuration mainly involves heat dissipation in the fire prevention problem. When the display is working, the exhaust fan and the air conditioner are configured to cool and cool the interior of the screen body. It is recommended to install 1P air conditioner every 8-10 squares to ensure that the temperature inside the screen is kept at a normal temperature. If the air conditioner or exhaust fan is not in place, the heat treatment will be uneven, which may cause safety hazards inside the screen due to temperature increase. At the same time, many LED companies only test the spray waterproofing in the external environment when testing the protection level of the cabinet. The durability and strength of the waterproof effect are yet to be verified, so that after the display product has been used for a while, Water seepage occurs, which is an important reason why outdoor displays are prone to fire or have a short service life. In response to thunderstorms, the screen device arrester is also an essential tool to avoid lightning strikes and burn out the internal components of the screen. It can directly direct lightning into the ground without affecting the screen.

All of the above are internal reasons for LED displays. Of course, we can't ignore the human factors caused by the later maintenance process. For example, in the subsequent maintenance work, the operators did not follow the strict process flow (the module screws are not tightened, If the polarity of the wire is reversed, and conductive objects are left behind after the operation, it is easy to cause a fire.