You haven't said if this screen is going to be a permanent installation or one that you can take down easily.
It would also be nice to know what projector you are using (and if it is ceiling, shelf or table mounted) and how large a screen you intend on making.
Hanging a screen directly from the ceiling has always worried me; unless you can suspend it from the supporting members themselves, there is always the possibility of the connector pulling out of the ceiling - and that is something we certainly don't want.
IMO, the most invisible support system would be an extended
"French cleat". Below is a YouTube video explaining what a French cleat system is. If you don't want to make them yourself (or don't have the tools), metal ones are available at many hardware and home improvement stores; although they may not be called French cleats, but something like "picture hangers", "mirror hangers" or somesuch.
YouTube - French Cleat