Fully Closing Draperies
If you want to combine the traditional look of sheer draperies and the functionality of vertical blinds choose sheer verticals. The under structure is a vertical blind but the sheer fabric that covers the vertical vanes brings this treatment to a new level. By simply rotating the vanes you can go from light filtering to complete privacy.
Sliding Shoji Screens
This is an unusual solution for a patio door but it is a functional one. A shoji screen has a wooden gridded frame with translucent paper inserted between the grids. Check out Shoji Design Inc. for beautiful designs.
Bi-fold plantation shutters are hinged together and fold against each other, similar to a closet door. You can choose between panels that are free hanging or ones used with a track to guide and support them. Bi-fold panels can be configured to open to one side or to both sides of the window.