After so many years of development, the LED display screen has undergone many changes, from the earliest monochrome plain text display to the current gray scale of 16,777,216 colors. From the beginning, the large-pitch P50 LED display screen can only be hung on the outer wall of the hotel. The curtain wall has developed to the current high-definition display of small-pitch LED display P0.8, which can be compared with TV. From the very beginning, it can only be displayed on a flat surface to various shapes of LED displays, such as spherical, cylindrical, tunnel-shaped, outer arc and inner arc, etc., as well as glass LED displays, interactive screens, etc., which are very popular recently. All reflect the ever-changing changes.