Due to the small spacing of conventional SMD small pitch displays, the display unit cannot be glued or installed with a mask, exposing the LED on the outside, making the display waterproof, dustproof, and collision resistant obstacles for dust free crossing. Even during transportation, the light beads will be knocked off. The COB integrated packaging technology has completely overcome the difficulties that SMD cannot overcome with small spacing, truly achieving waterproofing, dust prevention, and impact resistance.