Today there are three tendencies that can describe development of large screen technology in city environment:
1) Individual installation of outdoor LED screens with no regard for urban landscape, architectural peculiarities of nearby territory, effect on citizens. There are plenty of examples in Europe, USA and Russia.
2) Substitution of existing advertising outdoor structures for sophisticated LED screens. The best examples can be seen in Shanghai (China), a network of Clear Channel in New York (USA), and Moscow (Russia).
Both tendencies are mostly related with advertising application of outdoor LED screens.
Third tendency is to use large outdoor LED screens not only for outdoor advertising but as a large scale public address system in case of various massive events: terrorist threats, floods and other emergencies, as informational support systems in public campaigns, or festivities. It is the third tendency that will be essential in future. Because it allows to reasonably combining commercial interests of advertisers and interests of a civic society, as represented by federal and municipal authorities.