Projection Screen for Fabric Projector Screen

By Outdoor Projector on September 15, 2009 in Outdoor Projector

Projection Screen for Fabric Projector Screen

Outdoor Projector I want to introduct something about VA1121 easel. VA1121 easel SIZE:45X66X122CM PACKING:1PC/CTN CARTON SIZE:120X10X7.5CM VA1121 eas Home theater projection screen (119 in., wall-mounted). A Projection screen is an installation consisting of a surface and a support structure used for displaying a projected image for the view of an audience. Projection screens may be permanently installed as in a movie theater, painted on the wall , semi-permanent or mobile, as in a conference room or other non-dedicated viewing space. 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. Home theater projection screen displaying a high-definition television image. 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. Contents 1 Screens by installation type 2 Screen gain 3 Screen geometry and optics 4 Image brightness and contrast 5 Grey screens 6 Selectively reflective screens 7 Screens as an optical element 8 See also 9 References 10 External links // Screens by installation type In commercial movie theaters, the screen is a reflective surface which may be either aluminized (for high contrast in moderate ambient light) or a white surface with small glass beads (for high brilliance under dark conditions). The screen also has hundreds of small, evenly spaced holes in order to allow the passage of air to and from the speakers and subwoofer which often are directly behind it. Rigid wall-mounted screens maintain their geometry perfectly just like the big movie screens, which makes them suitable for applications that demand exact reproduction of image geometry. Such screens are often used in home theaters, along with the pull-down screens. Pull-down screens (also known as Manual Wall Screens) are often used in spaces where a permanently installed screen would require too much space. These commonly use painted fabric that is rolled in the screen case when not used, making them less obtrusive when the screen is not in use. Electric screens can be wall mounted, ceiling mounted or ceiling recessed. These are often larger screens, though electric screens are available for home theater use as well. Electric screens are similar to pull-down screens, but instead of the screen being pulled down manually, an electric motor raises and lowers the screen. Electric screens are usually raised or lowered using either a remote control or wall-mounted switch, although some projectors are equipped with an interface that connects to the screen and automatically lowers the screen when the projector is switched on and raises it when the projector is switched off. Inflatable outdoor movie screen Mobile screens usually use either a pull-down screen on a free stand, or pull up from a weighted base. These can be used when it is impossible or impractical to mount the screen to a wall or a ceiling. Both mobile and permanently installed pull-down screens may be of tensioned or not tensioned variety. Tensioned models attempt to keep the fabric flat and immobile, whereas the not tensioned models have the fabric of the screen hanging freely from their support structures. In the latter screens the fabric can rarely stay immobile if there are currents of air in the room, giving imperfections to the projected image. Specialty screens may not fall into any of these categories. These include non-solid screens, inflatable screens and others. See the respective articles for more information. Screen gain One of the most often quoted properties in a home theater screen is the gain. This is a measure of reflectivity of light compared to a screen coated with magnesium carbonate or titanium dioxide, when the measurement is taken for light targeted and reflected perpendicular to the screen. Titanium dioxide is a bright white colour, but greater gains can be accomplished with materials that reflect more of the light parallel to projection axis and less off-axis. Frequently quoted gain levels of various materials range from 0.8 of light grey matte screens to 2.5 of the more highly reflective glass bead…(and so on) To get More information , you can visit some products about a frame hoist, label rolls, chrome plastic plating, electric towel heaters, women cocktail dress, touch screen add on, metal to metal glue, akoya pearls, steel interior, plastic roof tile, . The VA1121 easel products should be show more here!