Consider a case that you are rushing to a train station. When you are queuing up, you look up at the scrolling digital signage to search for the train you plan to take. When you get to see it, near it is the platform number that you are unable to see clearly whatever the angle is. As you approach, you finally get to know what causes invisibility——small dark spots appear in a certain regular distribution on the screen.

Why are there small dark spots distributed in a certain pattern on LED walls?

LED walls are modularly designed, consisting of multiple display units. For easy installation and maintenance, modules in most cases are magnetically attached to the LED display units. Metal dust in the air will over time be adhered to the modules to form dark or black spots. As the magnets are distributed at the four corners of the modules, therefore the dark spots come out singly, in pairs or in groups of 3 or 4.

In some indoor or semi-outdoor scenarios like subway platforms and train stations where wheel and track rubs drastically, uncounted metallic dust is easily produced. Another reason is that the train's braking system, such as brake pads and brake discs, also generate friction during braking, leading to metallic dust.

What impacts will metal dust have on LED screens?

These adhered metallic dust not only brings about invisibility, it can even cause LED abnormality as time goes by, including incomplete color display, always-on pixels and dead pixels. What’s worse, metallic dust can even lead to “LED caterpillar” failure, i,e, a line of always-on pixels, significantly impairing visual experience.

Solution to small dark spots with certain regular distribution on an LED video wall

LianTronics’s self-developed “M Dust-shield” Technology employs special materials and unique processing and assembly methods to effectively shield and eliminate the magnetic force on the display surface. By doing so, it inhibits the adsorption of metal dust to the surface of the LED panels, thus avoid dark spot and ensures the clarity and display quality of the screen, enhancing the viewing experience for passengers. Compared with unprocessed LED screens with as high magnetic force as 50Gs, LED screens processed with M Dust-shield are only 1Gs.

LianTronics' "M Dust-shield" Technology addresses the issue of metal dust being attracted to the modules, which leads to the appearance of small dark spots on LED walls.

LianTronics' "M Dust-shield" Technology addresses the issue of high magnetic force that leads to small dark spots on LED walls.

In summary, M Dust-shield provides an effective solution to the problem of metal dust adhering to LED displays in special environments. With its application, LED indoor displays can continue to shine brightly in transportation hubs, retail stores, factories and other critical locations.