Like this? (6" Display)
http://www.ainslie.org.uk/callerid/pics/boxes/bt_cd-2k.gif
The photo does not do it justice, it's a nice large display.
I guess its possible using custom characters on a "normal" 4 line display?
Looks like a 16x2 display or maybe an 80 x 14 (or larger) graphics display.
I'm guessing when you say 6" display you mean the total width is 6 inches, not the height of each character.
Yes, that's the total width of the display, each number is about 20mm high.