Enclosure is made of PVC material and network light guide fiber combination, commonly known as the treasure cloth, with good flexibility, uniform light transmission, easy to segment, splicing, shipping, outdoor installation is simple, especially suitable for color printing. According to the requirements of outdoor use, Polaris cloth can achieve waterproof, mildew resistance, flame retardant, cold and heat resistance, UV resistance and other effects. Due to the strong resistance to typhoons. Therefore, it is particularly suitable for the production of large outdoor advertising signs. At present, 95% of the large color printing enclosure screen in the Chinese market are selected as the base material of treasure cloth.