_ take a screen where you see the difference between 2 pixels (say a diagonal line without AA)
_ note down the resolution say 800x600 (SDTV)
_ then step back until you can no longer differenciate the pixels and see only a diagonal line (no more step effect)... there you go you have your limit of sight for 2 pixels
_ Now just take the size of the screen from where you are and plug it into your range of sight (how many times could ou see similar TVs next to each other).
_ For example you could see 5 TVs in width and 4 in height. Then at this distance your resolution of sight for which you can no longer distinguish 2 pixels will be
5x800 _ 4x600 or 4000x2400
This is an example and will change for everyone... and it's not accurate at all, but will give you a rough idea.
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