LEDwalk 跑马灯 它的基本结构是一块电致发光的半导体材料，四周用环氧树脂密封，起到保护内部芯线的作用，所以 LED 的抗震性能好。 -LEDwalk Marquee and its basic structure is a electroluminescent light-emitting semiconductor material, sealed with epoxy resin around, play a role in the protection of the intern