The viewing distance is the distance that a viewer should be from a display, an info screen or a video wall. It depends on the size of the screen and the screen resolution. The distance must be greater for larger screens, while it can be smaller for smaller screens. Generally, one assumes 4 to 5 times the height of the screen. For higher screen resolutions, such as HDTV
with higher line density, a viewing distance of 2 to 2.5 times the screen height is sufficient. For electronic billboards and LED walls, the pixel distance is decisive for the viewing distance.
The viewing distance can be expressed as the pixel pitch in millimetres in metres. For example, if the pixel pitch is 15 mm, then the minimum viewing distance should be 15 m.