Probably a major reason Apple had to invent the "retina" marketing term, was because the more common phrase "print quality" (300 dpi at 12") had already been used.
Back when the first iPhone went on sale in mid 2007, the Toshiba Portégé G900 WM6 Professional touchscreen phone had a 3 inch WVGA display with 313 ppi.. and was advertised as the "first smartphone with a print quality" screen.
The Sony Ericsson Xperia X1 followed up with the same a year later, and then came other phones.
There was no way Jobs would let the much later iPhone 4 be known as "not the first smartphone with a print quality" screen. So they made up a new term. Brilliant marketing
Back when the first iPhone went on sale in mid 2007, the Toshiba Portégé G900 WM6 Professional touchscreen phone had a 3 inch WVGA display with 313 ppi.. and was advertised as the "first smartphone with a print quality" screen.
The Sony Ericsson Xperia X1 followed up with the same a year later, and then came other phones.
There was no way Jobs would let the much later iPhone 4 be known as "not the first smartphone with a print quality" screen. So they made up a new term. Brilliant marketing