Honda. Tesla Someday
There is no magical 300 ppi limit as you claim. Retina display is a completely made up marketing term. It has no clear definition, and will be used by Apple to market any device they release in the future that they feel has a high enough resolution.
Apple is about to release an iPad 2 with a resolution of 2048 x 1536 which calculates to a ppi of 260, and they have every intention of marketing the device as having a Retina display.
If a display with a ppi of 260 can be considered Retina just because the device has a larger screen, why can't a device with a ppi of 285 be called Retina since the device will likewise have a larger screen?
The iPad won't be the last time you see the term either. I fully expect to see Macbook Pros, iMacs, and Cinema Displays with substantially higher resolutions in the future, and these devices will also likewise be marketed with a term Retina display, even though most of them will not have a ppi above 300 either, despite the substantial upgrade in resolution.
The vast majority of laptops, monitors, hdtvs have a dpi of around a 130 or so. If the screen looks sufficiently high res and the pixels sufficiently difficult to see, it doesn't actually matter the precise ppi number.
Retina display is a completely made up marketing term. It has no clear definition, and it can be used to mean whatever Apple wants it to mean.
Fair point. The way I saw it was that 'Retina' display meant 'can't see the pixels'. But if what you are saying is true (I guess it is), then fair enough.