We get a lot of questions about how to properly calculate the minimum viewing distance for LED video walls of specific sizes. Here's an easy calculator.
Take the video wall pixel pitch in millimeters, multiply by 3 and add 10%.
For example, we'll use a very common 3.91mm pixel pitch wall panel. 3.91 x 3 = 11.73 + 10% is 12.9'.
If you view the wall at any closer than about 13', the picture will appear to be very grainy. The reason for this is that LED wall panels have relative low native resolution (a half-meter panel with 3.91 pixel pitch uses just 128x128 pixels), and it takes several individual panels to create a presentation display like you'd see in an auditorium or church. A 4x7 grid of these panels will create an 80x139" display (about the same size as a 12' projection screen). That display will have a native resolution of 896x512 pixels.
I hope that helps you understand a bit more about minimum viewing distance. If you have questions about LED video walls and whether they're a good fit for your application, please call us at 800-747-7301.