It is necessary first of all to determine the place where the large outdoor digital screen will be located and then to decide what will be the linear sizes (proceeding from the location characteristics of the outdoor screen) because they determine the amount of people who will see the information on the advertising screen.
When we come to an oculist, we look at small 1-5 cm letters from a distance of 3 m. The majority of people can see 5 cm letters without any difficulty. And if we want people to see the information (minimum 3 text lines) from a distance of about 100-150 m, the size of your digital advertising screen or sign should be no less than 4 m, and it should be more than 4 m above the ground. If the100-150 m area is not limited with the trees and buildings at its perimeter and continues as far as 300-600 m with a central highway or a street, the vertical size of the outdoor digital screen should be about 9 meters, and it should be more than 5-6 m above the ground.