Resources » FAQ
  • What is "screen gain" ?
    Screen gain is the degree of brightness of the image projected on the screen. A high screen gain indicates a bright screen while low screen gain indicates a dark screen. Gain is a measure of reflectivity. Screen gain can varies from 0.5 to 12.

  • What is "viewing angle" ?
    The viewing angle is the maximum angle at which the image on the screen can be recognized when a person is viewing the screen from the side. The viewing angle is expressed in terms of both the vertical (up or down) and horizontal (left or right) angle of the screen.

  • Flatness of the Projection Screen is very important if you plan to project computer text, since 
    most projectors have a very narrow plane of focus and will not provide a consistently sharp image on 
    a rippled screen. Obviously, this will not be a problem with a rigid rear screen or even with fast- fold, 
    but it is a big factor in a wall screen. Tensioning systems physically pull a flexible material straight 
    to greatly improve the image focus.

  • How to choose screen fabrics surface?
    You'll need to choose a surface with your projection source and lighting conditions in mind. It will determine the sharpness and brightness of your projected image. In front projection, matte white surfaces (by far the most popular) offer excellent definition for finely-detailed images, such as computer text, while providing very good image. Silver or high gain provide particularly bright images best foe video or computer projection. In rear projection situations, there are a variety of coatings and screen materials designed for specific situations. Most standard surfaces are best for rooms with a relatively narrow seating cone and good lighting control, with specialty surfaces available when viewing angles will be wide or lighting high.

  • Comparison between Front and Rear screen
    For most purposes, a front projection screen is the obvious choice, simply because it can fit into any room without the need to build a projection booth. Still, a rear screen has advantages. It will permit the use of visuals in near normal room lighting, allowing your audience to take notes and your speaker to maintain eye contact with audience members. No matter what your lighting levels, the effects of ambient light will be reduced, producing images of better contrast. Speakers may walk in front of a rear screen without casting shadows. Finally, the noise and distraction of equipment is eliminated by moving it to a separate room.

  • Screen Gain and Directivity
    Higher screen gain contributes to higher brightness. However as the screen became higher the scale of reflected light directivity becomes narrow. In other words, the viewing angle became smaller. Therefore for deciding which screen to use the correlation between the screen gain and directivity should be considered in addition to the room conditions and the application.

  • What is "resolution" ?
    The resolution of an image is the degree to which small details are reproduced. This is usually expressed in the form of W x H, where W and H respectively refer to the number of horizontal and vertical dots that make up an image. (these dots are also called picture elements or pixels). The higher the resolution, the sharper the image.

  • What is "contrast ratio" ?
    Contrast ratio is ration between the brightness and darkness sections of an image. A higher contrast ratio means a clearer picture. Rear projectors that are not affected by room lighting or sunlight have the highest contrast ratio, so their images are the clearest and easiest to see.

  • What is "keystone correction" ?
    Keystone correction on a tripod or wall screen tilts the top of the screen forward to minimize rectangular distortion caused by the projector being positioned lower than the center of the screen. Tilting the screen will not always be necessary, as many video projectors have their own correction built in. It's important, however, with slide, overhead and many LCD projectors.

  • Why need "black borders" ?
    Blacks borders can be very helpful. They provided a crisp edge for any picture, eliminating any wash onto the wall behind your screen and masking any unevenness due to out-of-level projectors. By their contrast with the projected image, they also fool the eye into perceiving the image as brighter and more colorful than it would otherwise be.

  • How does the type of screen affect brightness ?
    You should choose the type of screen based on the location where it will be used. In general, the larger the screen the darker the image. However, you can boost the brightness somewhat by choosing a screen with a higher gain. Such screens are especially useful for long and narrow room. If you have a wide room, then you should choose a screen with a wide viewing angle.

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