http://asia.cnet.com/why-4k-tvs-are-stupid-62213238.htm

Brace yourself for some math
The human eye, for all its amazingness, has a finite resolution. This is why you can read your computer screen from where you're sitting, but not if you're on the other side of the room. Everyone is different, but the average person with 20/20 vision can resolve 1 arcminute. One arcminute is 1/60th a degree. If you assume your field of vision is 180 degrees (it's not, but go with me here), and you take 1 degree of that, you're able to resolve a 1/60th sliver of that degree.

Close up this means you can see hairs on your arm, wrinkles on your thumb, and so on. At distance, these fine details disappear. If a friend waves at you from across a field, you can probably see the person's thumbs, but not any wrinkles or hair. Far enough away, you probably won't even be able to see thumbs, unless those are some really, really big thumbs.

One arcminute of resolution is a best-case scenario. On a black on white vision chart, this holds true. Reduce the contrast of the object with the background, add color, and many other factors limit your ability to resolve resolution.

This math, or just looking at your TV, tells you that you can't see individual pixels.


http://asia.cnet.com/why-4k-tvs-are...ll-62218620.htm