The correct placement, the position of the projection plane, in relation to viewers, is conceptually based on several of the following recommendations:
Basic distribution of projection screens:
It is also possible to classify projection screens according to the design: with a roller shutter (operated manually or electrically), with the frame-to-wall, with mobile frame, with tripod and with the cinema screen.
The format of the screen is specified by two dimensions - width and height (W × H). Taking these two dimensions into consideration, the projection surfaces can be divided into:
Why is the widescreen format now preferred?
There are two reasons. The first one is that the maximum screen size is often limited by the height of the room, the second one is that at the same height of the screen as compared to the conventional screen more information is displayed.
Each screen has its own specific surface, which we choose with regard to the type of projection: