Android 1080p Smartphones

Its seems that this year will be be the year of the 1080p smartphone. With Sony launching the Experia Z and the rumoured Galaxy S4 and the HTC M7 all having 1080p screens. These Smart phones will have a ppi (pixels per inch ) of over 450 of more. The human eye sruggles to see individual pixels above 300 ppi ,so sounds like these screens are pointless. No doubt though I will I still sell my S3 when The S4 comes out hopefully in April.