Outdoor big led display screens exists everywhere in the bustling commercial streets in nowadays.Because of its high brightness and large area properties, it may bring a certain degree of visual pollution to the cities. For example, the Coca-Cola’s advertising display are using bright red color as the uniform background application standard to catch eyes from public in China. However, its outdoor advertisements in Tokyo Japan is using white color as the background color to avoid bothering civil daily life.

 Similarly, the McDonald shop signs in Paris, France are using low-pitched gray color as the background color but not the bright red color as we do in China.

 All the harmonious phenomenons in foreign countries are mandatory by law to protect urban color.

         From the urban planning point of view, too many inappropriate outdoor large led display screens will destroy the city landscape in a certain degree. As we all know, the urban architectures are the name card of the city, it needs to concern the molding and functions of the buildings themselves and has to think about the architectural and urban style, the surrounding environment as well as the relationship with the outdoor large led display screens. Only  when these indicators are in harmonious and supplemented coexistence,  it is a perfect presentation.