In rainy and foggy weather, water droplets and fog are easily attached to the surface of LED display screens, forming a "hazy filter" that causes the screen to be gray. The nano-hydrophobic coating uses molecular-level protection technology to create an "invisible shield" for the display screen that is water-resistant and fog-resistant. The coating uses silica nanoparticles as the core material. After construction, a rough microstructure with a diameter of only 50-100nm is formed on the surface of the screen, like countless microscopic "lotus leaf protrusions". The surface tension is used to make water droplets gather into a sphere and roll down, while reducing the area of fog adhesion, solving the problem of screen graying from a physical level.

Before construction, three basic preparations need to be completed: wipe the surface of the LED display screen with a dust-free cloth dipped in a special cleaner to remove oil and dust; ensure that the construction environment temperature is 15-30℃ and the humidity is less than 60% to avoid affecting the curing of the coating; dilute the nano-hydrophobic coating in a ratio of 1:5 and pour it into a high-pressure atomizing spray gun. During the formal construction, the spray gun needs to be kept at a distance of 15-20cm and move at a constant speed, spraying in a "M"-shaped trajectory to ensure that the coating thickness is evenly controlled at 3-5μm. Too thick will easily affect the transmittance, and too thin will result in insufficient protection. After spraying, it needs to be left to solidify for 24 hours, and avoid touching the screen during this period. The final transparent coating has a transmittance of more than 98%, but can make the water drop contact angle greater than 110°, achieving the protective effect of "water droplets rolling down without leaving marks".

Construction details need to be adjusted for different types of LED display screens: outdoor full-color screens can use the "twice thin spray" process to enhance the durability of protection due to the large pixel spacing; transparent screens need to reduce the coating concentration to 1:8 to avoid affecting the sense of transparency; curved screens need to cooperate with rotating brackets during construction to ensure uniform spraying at all angles of the curved surface. According to actual tests, the amount of water droplets on the LED display screen sprayed with nano-hydrophobic coating is reduced by more than 85% in moderate rain, the contrast ratio is increased by 40% in foggy weather, and the graying phenomenon of the screen is significantly improved. From large-scale city landmark screens to traffic guidance screens, standardized nano-hydrophobic coating construction is becoming a standard protection solution for LED displays in rainy and foggy weather, allowing the screen to always maintain a clear display in a humid environment.