Planar PD7170 User Manual

PREL

IMINA

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In 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 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.

Estimating Throw Distance
Throw Distance (TD)  = 
Screen Width (w)  x  Lens Throw Ratio

TD

Scr

een width (w)