Projector Screens, Projector Screen Reviews
Uniformly white or grey screens are used almost exclusively as to avoid any discoloration to the image, while the most desired brightness of the screen depends on a number of variables, such as the ambient light level and the luminous power of the image source.Flat or curved screens may be used depending on the optics used to project the image and the desired geometrical accuracy of the image production, flat screens being the more common of the two. Screens can be further designed for front or back projection, the more common front projection systems having the image source situated on the same side of the screen as the audience.
Different markets exist for screens targeted for use with digital projectors, movie projectors, overhead projectors and slide projectors, although the basic idea for each of them is very much the same: front projection screens work on diffusely reflecting the light projected on to them, whereas back projection screens work by diffusely transmitting the light through them.
Certain screens are designed to selectively reflect the narrow wavelengths of projector light while absorbing other wavelengths in the optical spectrum. One screen made by Sony, which appears grey when viewed in normal room light, is designed to reduce the effect of ambient light.
This works by preferentially absorbing ambient light of colors not used by the projector, while preferentially reflecting the colors of red, green and blue light the projector uses. A contrast-enhancing screen has been introduced by Dai Nippon Printing (DNP) and Screen Innovations which is based on thin layers of black louvers rather than wavelength-selective reflection properties.
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