"on a phone" SMPTE suggest that 4k for viewing is only worthwhile for people with 20/20 vision once the viewing angle increases beyond 30 degrees. I'm current

"on a phone" SMPTE suggest that 4k for viewing is only worthwhile for people with 20/20 vision once the viewing angle increases beyond 30 degrees. I'm currently looking at a 40cm wide screen, I'm 80cm away from it, which is about 30 degrees. For my phone to fill that amount of space it would have to be about 10cm in front of my eyes due to binocular vision (if I just use one eye it's a bit further When I watch something on my phone it's typically 50cm away, about 15-20 degrees viewing. 720p is more than enough at that size, 1080p if you have particularly good eyesight.