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Planar PD7170 Installation/Operation Manual 17
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Ambient LightIn general, minimize or eliminate light sources directed at the screen. Contrast
ratio in your images will be noticeably reduced if light directly strikes the screen,
such as when a shaft of light from a window or floodlight falls on the image.
Images may then appear washed out and less vibrant.
Throw DistanceThrow distance is the distance measured from the front of the projector to the
screen. This is an important calculation in any projector installation as it
determines whether or not you have enough room to install your projector with
a desired screen size and if your image will be the right size for your screen.
You can quickly estimate the throw distance by taking the width of the screen
and multiplying it by the lens throw ratio; see
Figure 3-2. The result of this
calculation tells you roughly how far back the projector should be positioned
from the screen in order to project a focused image large enough to fill the
screen.
Figure 3-2. Estimating Throw Distance
Estimating Throw Distance
Throw Distance (TD) =
Screen Width (w) x Lens Throw Ratio
TD
Screen width (w)