No, you cannot connect any current Apple LCD to the iBooks (adapters exist, but are extremely costly).
I suggest you look at a Samsung display instead. They are top quality (Apple uses Samsung displays, among others), and are reasonably priced.
Remember that on an iBook G4, you can only do video mirroring out of the box. To remove Apple's silly block on the screen spanning feature, use
Screen Spanning Doctor.
tooki