Infocomm recently published a standard on display size and viewing angles. It’s not new to most of us but a good reference for including in your design standards. I was a great fan of the ‘6H rule’ for screen sizing, but am now even fonder of the 150H rule.
The 6H rule means the most distant viewer can be no more than 6 times the image height (6H) from the screen to be able to read the content. Example: if the rear row of seats in a theatre is 12m from the screen, the image must be at least 2m high. Width is determined by aspect ratio, but height is the governing dimension.
However with the advent of higher resolutions, there is a tendency to use smaller text and graphics, so viewability suffers. The 150H rule addresses this by saying the most distant viewer must be no more than 150 times the height of text on the screen. So for the same person 12m from the screen, the text must be no smaller than 80mm high (12,000 divided by 150).
The difference between the relevance of the 6H and 150H rules will be the intended recipient. An architect will understand the 6H rule and be able to size display wall space accordingly, but not the 150H rule because he/she won’t know the text size. The 150H rule is more applicable to academics preparing display content. AV staff can use it to deter academics from using stupid-by-stupid resolutions from their latest 4K laptop. If it’s printed in an international standard, it must be right hey?
Read the full article here.