INSTALLATION & SETUP
Screen Type
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Screen type is a very important factor when designing a projection system.
Inexperienced users or installers should always consult their dealer when deciding on
screen type. The following guidelines may be helpful to understand the differences
between screen types.
Front Screen Installations
There are two basic screen types: flat and curved. The choice between a flat screen versus
a curved screen is dependant on audience viewing angle and screen gain. There is always
a trade-off between viewing angle and gain. Viewing angles for both screen types are
illustrated in Figures 2-1 and 2-2.
Flat screens offer a gain of about 1 with a viewing angle just less than 1800. Incident
light reflects equally in all directions so the audience can see the display from various
angles. Because of the lower gain, flat screens are more effective when ambient lighting
is reduced.
Curved screens have gains larger than 1 and viewing ogles much less than 1800. Most
curved screens have different horizontal and vertical viewing angles. Incident light does
not reflect equally in all directions. The reflected light concentrates in a conical volume
or ''viewing cone''. Audiences within the viewing cone see a brighter image than that
from an equal area on a flat screen. Audiences outside the viewing cone see a dimmer
image.
2-3
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