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.

The billboard is a signal tool in the pull system to start the next production process, or to carry the WIP to the downstream process. This term means "signal" or "signal board" in Japanese.

Refers to all outdoor media that transmit advertising information. The media size depends on the actual environment.