(Dots Per Inch) The measurement of the resolution of display and printing systems. A typical CRT screen provides 96 dpi, which provides 9,216 dots per square inch (96x96). Flat panel LCD displays from 110 to 200 dpi have also been developed, and in the summer of 2010, Apple introduced its Retina Display screen on the iPhone 4 with an impressive 326 dpi.
Double the DPI, Quadruple the Dots
As the dpi rate doubles, the number of dots within a square inch is quadrupled, because dpi deals with two dimensions. Thus, while 100 dpi produces 10,000 actual dots per square inch, 200 dpi produces 40,000 (see below). We have a long way to go to make the resolution on a screen as dense as a printer. A 1200 dpi printer produces 157 times as many dots of resolution as a typical 96 dpi screen. See dot pitch, resolution and E Ink.
Dots Per
DPI Square Inch
96 9,216
100 10,000
200 40,000
300 90,000
600 360,000
1200 1,440,000
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