When someone is looking at your LED sign from a distance, the viewing angle should be good enough so that he/she can see it from the side. For example, in the case of a television, we know for sure that from a straight angle, it can be seen at any distance. But when you move to a side (away from the centre) the television screen will not be as clear. The maximum angle viewing configuration is defined by the viewing angle and is determined by measuring 50% light intensity at the horizontal and vertical points seen directly opposite the sign.
The viewing angle is an important aspect because that is what ensures the maximum amount of time that passersby are able to view your sign. A better viewing angle will give people more time to read the information on the sign. In addition to that, make sure your sign is placed at an appropriate location because that will considerably affect the viewing distance.