Since I had the iPhone 4 CAD drawing that Apple gives out to case makers, I put 3.5, 3.7, 3.8, 3.9 and 4.0" overlays on it so show exactly what will and what won't fit in the same iPhone housing. As you can see, 4.0 is not even possible. 3.9 will go edge to edge and I'm not even sure that's possible. It looks like 3.7 or 3.8 is the only option...
The current 3.5" "retina" screen is 326ppi (pixels per inch).
Variations according to size:
3.7" = 308.39ppi
3.8" = 300.24ppi
3.9" = 292.42ppi
4.0" = 285.25ppi
Technically, the human eye cannot descern anything above 300ppi, so Apple could do 3.8" and still call it "retina".
Anyway, this is good for reference if nothing else...
The current 3.5" "retina" screen is 326ppi (pixels per inch).
Variations according to size:
3.7" = 308.39ppi
3.8" = 300.24ppi
3.9" = 292.42ppi
4.0" = 285.25ppi
Technically, the human eye cannot descern anything above 300ppi, so Apple could do 3.8" and still call it "retina".
Anyway, this is good for reference if nothing else...
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