Planar PD7170 operation manual Ambient Light, Throw Distance

Installation

In general, minimize or eliminate light sources directed at the screen. Contrast	Ambient Light
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 distance is the distance measured from the front of the projector to the	Throw Distance
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.

Estimating Throw Distance

Throw Distance (TD) =

Screen Width (w) x Lens Throw Ratio

Screen	width
		(w)

TD

Figure 3-2. Estimating Throw Distance

Planar PD7170 Installation/Operation Manual 17