| Screen Size
The aspect ratio of the image from a data projector is 4:3 (width x height).
Unless otherwise stated, the size of a screen is often stated as the length
of the diagonal. For example a 5' screen would be 4' wide and 3' high.
Choose your screen size with care. A large screen may need a more powerful
projector and subdued light. Don't put a large screen in a small room.
Screen Surface Technology
The clarity of the picture is a function of both brightness and contrast
of the projector, the amount of ambient light and the reflection value
of the projection screen. Matt white fabric has a reflection value of
1.0; a high gain fabric can be as high as 2.8. more