In some countries and regions around the world, most of the temperature is below -30℃ throughout the year and the temperature in some area is even lower, such as some countries like Russia, the historical minimum temperature is -71℃; The extreme minimum temperature in North America is -63℃; In northern of China, Harbin, Changchun, and Hohhot are the TOP3 coldest cities in China, and the weather station recorded an extreme low temperature of -58℃. LED displays in low temperature areas face great challenges.
Regarding the outdoor LED displays that are installed in low temperature environment, its materials have different coefficient of thermal expansion and inconsistent changes in physical dimensions such as masks, PCB, module kits, cabinet frames, etc. The problems which are easy to appear as below:
1. There would be a gap between module and module, cabinet and cabinet.
2. The shrinkage and fracture of the kit caused by the inconsistent shrinkage of the module kit and the cabinet frame.
3. The inconsistent shrinkage between led lamp and the mask, causing the led lamp to loosen and display failure;
4. The hidden dangers of water ingress caused by the shrinkage of the waterproof rubber ring of the cabinet in low temperature.
5. The electronic device cannot start and work normally.
Furthermore, in the low temperature environment, the protective layer attached to the surface of the cable is easily broken, which will lead to serious problems such as short circuits or even fire; Outdoor LED displays may also have some electronic components that cannot work properly, making the entire screen unable to run properly.
In response to the above problems, outdoor fixed LED displays can deal with the low-temperature environments by applying the following solutions.
Objects tend to become brittle under low temperatures, which is also a risk for LED display. Adopting low-temperature resistant raw materials and devices, such as cold-resistant masks and bottom shell kits, low-temperature resistant waterproof glue, low-temperature power supply (can be started in an environment of -40℃; -25℃); Adopting low-temperature resistant cabinets, low-temperature resistant electronic devices and connectors.
Since outdoor fixed LED display work in an outdoor environment for a long time, the PCB, power supply, solder joints, etc. have high requirements for high and low temperature resistance, water resistance, and corrosion resistance ability. It is recommended to carry out the coating and cold-proof treatment for PCB, components and parts, solder joints, etc., Protecting the circuits from damage under the environments that contains chemical substances (such as: fuel, coolant, etc.), vibration, humidity, salt spray, humidity and high temperature, low temperature conditions , thereby prolonging their lifespan.
Make a closed channel inside the large screen, and install a hot air axial flow at the rear, and its working state will be realized by the temperature control system. When the temperature is lower than the minimum ambient temperature for starting the power supply, the air curtain will heat up, and the screen can be turned on normally after the temperature of the screen rises. When the temperature reaches the setting temperature, the temperature control system will cut off the power supply.
After years of research and development, YES TECH has launched the outdoor fixed installation product: ES series and Msign series, selecting brand raw materials to ensure the product’s superior environmental adaptability and protection capabilities. YESTECH has a CNAS nationally accredited laboratory. All cabinets are tested repeatedly before leaving the factory. Test the reliability of the product in low-temperature operation and storage, as well as the reliability in alternate cold and hot environments, to meet the normal use of the screen in a low-temperature environment.
In terms of maintenance in low temperature environments, outdoor screens must take precautions to prevent ice condensation. When performing maintenance, pay special attention to safety hazards such as internal wiring or panel damp and moisture, check whether the wiring is loose or falling off, whether the internal component are dusty, and whether the mounting screws are loose and other safety hazards.