The main structure of the external light billboard is iron frame plus spray painting, and some are covered with metal edges, plus spotlights. For example, the production of large billboards, such as billboards on the roof and column advertisements, is the heart of the billboards. It is unsafe to have a solid steel structure as support.

It is mainly divided into monochrome and full-color display screens. The monochrome price is low. It is applicable to places that only need to display text and are constantly updated, such as hospitals, banks, passenger stations, tax authorities, docks, wholesale markets, hotels, etc. The full-color LED display is actually equivalent to a display or an advertising player. The cost investment of large full-color billboards in the early stage is quite large, which is mainly applicable to advertising, central urban areas with very large traffic, sports venues, etc.