What is the principle of subway tunnel video? Which company does the subway video belong to?

This is an advertising company called Tunnel Cool Media.

If you often take the subway, you will often see tunnel advertisements.

The advertising video looks like a long screen, but it is actually an LED light column. It is similar to the principle of movies, but just the other way around, the movie is that the audience sits still and the movie pictures move one by one; Tunnel cool media is just the opposite. The audience was moved by the subway, but the LED beam did not move. Their advertising equipment is about 600 LED beams, about 300 meters. As soon as the subway starts, the images presented on these beams form a dynamic video.

Using the principle of "visual persistence".

Many international and domestic brands advertise in Tunnel Cool Media.