LED Advertisment System in the Tunnel is a digital imaging system, which integrated with microcomputer technique, electronic display technology, communication technique and computer image engineering.

By the theory of the film/TV and persistence of vision, people on the subway, which moves very fast, can see a serial of pictures through the led displays installed on the wall of the tunnel. It can be widely used in the subway(underground).

This system is developed by Beijing Jinri Group, which is the parent company of GW LEDs. There are only two countries who have developed the advertisement system in the world.