iPhone 4's "Retina Display" Claims Challenged

[wraggster]

Of the many things that buyers might need to know about the new iPhone; Raymond Soneira — president of DisplayMate Technolgies — added one more to the list. Raymond Soneira challenged Apple's claims that Apple's new iPhone contains a so-called 'retina display.' According to Soneira the the resolution of the retina is in angular measure, 50 cycles per degree, whereas a cycle is a line pair which is two pixels, so the angular resolution of the eye is 0.6 arc minutes per pixel. So, if you hold an iPhone at the typical 12 inches from your eyes that works out to 477 pixels per inch and at 8 inches it's 716 ppi. You have to hold iPhone 4 out about 18 inches before it falls to 318 ppi. So the iPhone has significantly lower resolution than the retina.

http://apple.slashdot.org/story/10/06/09/2130232/iPhone-4s-Retina-Display-Claims-Challenged