Nachtwind:
Especially since it is 4Lines compatible
In order to deal with "lines" you have to understand that there are two different components involved, and they define the term "lines" differently. You have obtained a device consisting of a printed circuit board on which is mounted a controller made by one manufacturer and a display, probably made by another manufacturer. The display typically has one, two or four lines of characters. As far as the controller is concerned, however, there are only two choices, one line or two. To make a long story short you should almost always program the controller for two lines. As far as I can tell this choice will also work for true "one line" displays with less than ideal, but still usable, brightness and/or contrast.
That's why designer2k2 said
to get it running for 4 lines just init a 2line...
floresta