Here are several ideas you might want to consider.
**Roller shades that are sheer so it is hard to see in during the day.
http://www.blindsgalore.com/category...oogle%A0%A0%A0
Maybe large sheer drapes Ikea carry large sizes that could work on a patio. Or use sunbrella fabric to block portions of views then mix it up with plantings to get a nice mix of things to block views.
http://www.sunbrella.com/
GolfNut - I bet that also helps you with the afternoon sun good move really like what you did.
The cheapest place I've found for yards of sunbrella fabric is e-bay.
Hope this helps and gives you several ideas.