Screens reflect the image being projected from a light source, such as a projector, making it visible. One of the most important properties of a screen is its reflectivity, which is determined by the gain factor. A gain factor of 1 ensures an even image across the full width of the room. This diffuses the light evenly in all directions, allowing the audience throughout the room to enjoy a clear image.
The size of the screen should always suit the room. For an assembly hall or lecture theater, you will need a large screen, while for presentations in your conference room, you will need a correspondingly smaller screen.
The distance to the first row of seats should be approximately 1.5 times the screen width, and in a home theater setting, approximately twice the screen width.
The bottom edge of the screen should be at least 1.25 m above the floor, while in a home theater setting, the distance from the floor to the screen should be 60–90 cm.
The ceiling height accordingly limits the screen height. The maximum distance to the last row should not exceed six times the screen width.
