For my new home theater I built a curved and acoustical transparent screen (Center Stage XD). I want to present my solution which worked very well.
The problem with a curved screen is the tensioning. When tensioned horizontally the fabric comes out of the frame which gives a ugly bulge. So I searched for a solution which tensions only vertically with an equally distributed force.
I stumbled over piping profiles used for the stands at exhibitions. Furtenately I live in Hannover which is home of the CeBIT so there are many companies around which produce such piping profiles.
I ordered two 4 m long profiles which were bended with a radius of 7 m. Then I let another company stew a strap on the long sides of the fabric. Inside this strap a flexible plastic pipe was inserted. So the whole straps could be inserted into the piping profiles. Which gives a equally distributed force for the vertical tension.
The profiles are connected directly to floor and ceiling. I used tightener to adjust the tension.
I was concerned that vertical waves still remain inside the fabric, because of the lack of horizontal tensioning. But this was not the case. I don't see any irregularities from my seat.
At the moment there is only a cheap DLP projector. But a good one with 4k will follow.
The depth of focus is great enough for the corners. The loss of focus is negligible. And usually the eye looks in the middle of the screen. Even with a windows dektop I hardly notice it. The mighty Sony G90 was worse in its corners than that ( I owned one).
The biggest problem with digital projectors and curved screens is the geometry distortion. This must
be corrected otherwise it looks horrible. CRT's were much more flexible in this regard.
Anyway, I use a Geobox G-202 to correct geometry. It is a small warping box which supports passive 3D, too.
Without geometry correction:
With geometry correction:
Of course there are scaling artifacts visible in test patterns
, but absolutely not in the movie picture. And I don't see any loss of sharpness although my seat is only 3.7 m away from the screen. It works very well!
A curved screen with that size and absolutely no visible speakers, subwoofers etc. around is an absolutely stunning experience. It feels like real theater and not like home
PS: the baffle wall build can found here