#11
With the new iPad then they say the battery is twice the capacity yet it still only gets 10hrs battery life. Its fantastic that battery life didn't take a hit between generations but imagine that new battery in the old iPad and getting 20hrs battery.

So I'm wondering if Retina has become such a buzzword and people just say "throw it in" without considering how it affects things. If we were given a choice between double battery or higher resolution then many might prefer more battery life since the Air's primary purpose is for mobility.

#22
Part of the problem with saying "Retina Display" is that it's used somewhat ambiguously. What would "retina" be on an 11" screen? 15" How about a desktop vs laptop?

Wikipedia quotes Apple as using "57 arcseconds per pixel" as the maximum amount of detail the human eye can perceive. So we can use this number as our baseline for what should be considered "Retina".

Note that decreasing arcseconds signify a higher amount of detail.

Now for some calculations. Below we have display, inches away from the eye while in use, PPI and arcseconds in bold:

"Retina" 12" 300ppi **57.26** = (206.265/305)*84.67

4S 12" 326ppi **52.69** = (206.265/305)*77.91

New iPad 15" 264ppi **52.09** = (206.265/381)*96.21

So the 4S and iPad are actually above retina level based on their definition. So taking that same value of 52 and assuming that the MBA will be used at a distance of 20" we can solve for a PPI number, and then we can see what standard resolutions match up.

Retina MBA 20" 198ppi **52.09** = (206.265/508)*128.28

So we get a PPI of 198. Cross checking that with the most likely resolutions we have in laptops, it would appear that 1920x1080 and 1920x1200 are the candidates. Considering the trend of switching to 16:9 aspect ratio, especially since the 11" already uses that aspect ratio, let's plug that into the equation.

1920x1080 in an 11.6" screen gives us 189.91ppi, which is close to the 198 we're looking for.

Retina MBA 20" 190ppi **54.28** = (206.265/508)*133.68

We end up with 54 arcseconds and at least numerically, a likely candidate for a resolution ignoring all other factors.

So with that in mind, are there any 11.6" 1080p panels in existence?