[citation][nom]watcha[/nom]Essentially, retina display is not a 'marketing ploy' - it's basic scientific knowledge. Your Nokia N900 isn't a retina display - it has a PPI of 267.As Steve Jobs said, the scientifically accepted PPI required for a smartphone is 300 ppi. Your N900 doesn't match this criteria.What you need to understand is that these PPI distances take into account the average distance that the users eyes are from their device.If you're 10,000 miles away, 1 ppi would be good enough.If you're 1 metre away, it wouldn't. Thus, the necessary PPI required for a device to constitute a 'retina' device depends on the distance a typical user holds the device.It is widely accepted, both scientifically and logically, that tablets are held further away (on average) than smartphones are. Thus, the necessary PPI to achieve a retina display is reduced. When Steve Jobs stated the 300 ppi he specifically referred to smartphones and the distance users hold them from their eyes. The PPI required for a tablet is lower than this, hence the iPad 3 also qualifies as 'Retina'.Nobody changed any definition - you just didn't understand what retina meant.Here is an article which may enlighten you:http://www.tuaw.com/2012/03/01/ret [...] -the-math/[/citation]
Except that it is a marketing ploy. There are plenty of phones with "Retina" display (above 300 ppi). For example, the Samsung Galaxy Nexus has a 4.65" OLED screen with 316 ppi, however it is not advertised as "Retina" display, because that is a marketing gimick which Apple has a copyright for. OLED beats LCD hands down by the way.