With a manual screen, you can create large images cost effectively. The housing of the manual screen is mounted to the ceiling or wall. When pulling the screen down, a built-in spring will stop the screen at the desired position. If the screen is no longer required, a short jerk is sufficient for the fabric to roll back into the housing until it is needed again.
Visible surface: The usable surface of a screen is the coated part of the cloth on which the image is projected. The frame and box width are always a few centimetres wider than the usable surface of the screen.
Viewable Area - Height
Visible surface: The usable surface of a screen is the coated part of the cloth on which the image is projected. The frame and box width are always a few centimetres wider than the usable surface of the screen.
Leader: The leader or offset is the part above the screen. This allows the upper vertical area of the fabric of a roller screen to be limited and freely determined within certain limits. The leading edge prevents the visible area of the screen from being set too high when a screen is positioned in rooms with high ceilings.
Aspect Ratio
Format: The projected image is output in a format (aspect ratio) specified by the projector. The format is also determined by the resolution of the projector (see also the entry "Resolution"). The screen format is usually selected on the basis of the format of the beamer image. The most common formats are 4:3, 16:9 and 16:10.
