Rear Projection Screens
The real purpose of any visual display system is to get as many light rays as possible from the projector into the eyes of the audience. Because of this, rear projection usually gives the best quality in projection. This is because of the simple fact that with rear projection the light goes directly from the projector into the eyes of the viewer without losing much of the light, which makes the projected 
image optically better.
Benefits of rear projection:
• Image quality.
• Less loss of contrast.
• With rear projection there is no projector in sight.
• With rear projection the presenter or teacher can walk in front of the screen without affecting the projection.
Usually rear projection is more space consuming than front projection because the projector has to be positioned behind the projection screen. The distance between the projector and the screen can be drastically reduced by using a mirror system.
