Comment Re: I won't notice (Score 1) 332
I can't recall a time in which it refered to anything else. Here's another example from 1985: the original Atari at service manual. http://www.atarimania.com/docu...
So it has been in use for at least 30 years. Not exactly "new". If you can find another reference before that in which it talks about resolution being described in pixel density (which would be hard I imagine as screens didn't have pixels back then). You might be able to find a reference to a tv (which isn't the same field) describing resolution in terms of lines, but again, lines isn't density either.