It gives you better privacy.
Blinds up or down for privacy.
The convex side faces the window creating less space through which to view.
When the blinds are turned up the rounded side faces outward.
The view and the light will be toward the direction of the ceiling.
Blinds turned in this direction offer more privacy and light control since the convex side faces the window blocking light or views from the outside.
By turning the blinds up you have the option of a little bit more control for a darker room if desired.
For the best light coverage add hanging pleats at the top of your window.
By turning the blinds up you limit the amount of visibility space directed towards the room.
Limiting visibility also means limiting lighting.
However having the rounded side facing out may not be as aesthetically pleasing as when the rounded side of the slats faces in.
When the blinds are lowered from the top small cords can be seen holding it in place which can slightly obstruct your view.
With the blinds tilted up passers by can t see in.
The most popular top down bottom up shade style is the honeycomb cellular which offers the best light control and privacy.
When the blinds are tilted down they could look pretty aesthetically but they provide less privacy as it creates larger gaps between the slats.
If the window is higher than street level then tilting the blinds up will give you more privacy.
It depends on where the window is in relation to the view from outside.
If the window is lower than the street level then tilting the blinds down will give you more privacy.
People won t be able to see inside when passing by.