INSTALLATION & SETUP

Screen Size and ➤Screen size and throw distance are interrelated. (See Appendices F and G.)
Throw DistanceAs screen size increases, the distance between the projector and the screen

 

also increases. During projection room design, make sure that the room

 

can accommodate the required position of the projector for the screen size

 

you need.

 

Screen Size

 

Screen sizes vary according to model and lens type. (See Appendices F

 

and G.) Choose a screen size which is appropriate for your application. If

 

the projector will be used to display text information it is important that

 

the image size allows the audience to clearly resolve all text. The eye usually

 

sees a letter clearly if eye-to-text distance is less than 150 times the height of

 

the letter. Small text, located too far from the eye, may not be legible at a

 

distance even though it is projected sharply and clearly on the screen.

 

To fill a screen with an image, the aspect ratio of the screen must be equal

 

to the aspect ratio of the image. The aspect ratio of an image is the ratio of

 

its width to its height. Standard video from a VCR has a 4:3 or 1.33:1

 

aspect ratio. For example, to display a VCR output with a 4:3 aspect ratio

 

onto a 10 foot (3m) high screen, the width of the screen must be at least

 

13.3 feet (4m).

 

Note: Screen size is often specified as diagonal size. Screens specified by diagonal

 

size have aspect ratios of 4:3. Screens with other aspect ratios are not typically

 

specified by diagonal size.

 

Throw Distance

 

The throw distance (projector-to-screen distance) must be determined for

 

every new installation. Throw distance, the distance between the projector’s

 

center lens and the center of the screen, is based on screen size. As screen

 

size increases, the distance between the projector and the screen increases.

 

Make sure that the room can accommodate the required position of the

 

projector for the chosen screen size.

 

Once your screen size is known you can determine the required throw dis-

 

tance for your projector model and lens by using the formulas in Appendix

 

G and tables in Appendix F.

 

Notes: 1) Calculated values are for reference only. It is good practice to simulate

 

the setup to determine the necessary throw distance. 2) Display size is affected by

 

input signal characteristics. Once the projector is set, use the Size function to fine

 

tune display size.

 

Throw distance and projection angle: Keep in mind that the ability to

 

properly focus all areas of the image is limited if a significantly tilted

 

projector is too close to the screen.

2.5