Outdoor blinds are not very common. In fact most homes prefer to go with curtains rather than blinds. Only commercial or industrial settings prefer blinds simply because they are easier maintenance.
Yet outdoor blinds have their uses. For example, if you have a covered patio, but want more privacy or you want to ensure that rain does not come in during the rainy season, an outdoor blind is a very simple, yet effective solution for your problem.
Other times you may want to install special outdoor blinds that come with UV protective coverings, if you live in areas where the sun is really hot. You install them on the outside of your windows and can lower them during the day and raise them up during the night.
You may have a pool outside your home, and may not want to spend the money on installing a fence all round your home. A simple outdoor blind will solve the problem. You can install them all round the pool, and when you don’t want to use them you can raise them up so that it does not reduce the sense of spaciousness that you get with a pool.
You can have reflective blinds that reflect light as it falls on it. This also works like a one way mirror where you can look outside, but no one on the outside can see inside.
These outdoor blinds can also be powered in the sense that you can raise and lower them with just the flick of a switch, or can be done manually. In fact there is a system of pulleys that you can install for these blinds so that pulling on a rope will roll them up, while loosening the rope will let them down. Furling them and tying them up by hand may not always be a practical thing all the time, and if your patio is a high one, this option may not be open to you at all.
Of course these outdoor blinds are a little more expensive than a normal one, because they should be hardy enough to stand the highs and lows of the environment. But if you really need some privacy out of doors, this is one of the cheapest options open to you. However expensive the blinds are they are definitely not as expensive as building walls.