Comment Re:4k at viewing distance isn't that special (Score 1) 304
Because it's approximately true. Nominal resolution of the human eye is 1 arc-minute (1/60 of a degree), therefore a 1920 pixel wide display will subtend 32 degrees horizontally at the resolution limit. At 9 feet (108 inches), a 62 inch wide screen will subtend 32 degrees horizontally. Since screen sizes are measured on the diagonal, that equates to a 71 inch diagonal.
If that resolution is correct then you shouldn't be able to tell the difference between a 150dpi display and a 300dpi display at 2 feet but I certainly can. I'm not sure the 0.3-0.4 arc-minute figure I quoted in my other reply is really typical but I think most people's vision is better than 1 arc-minute.