Christie J Series User Manual page 25

Front Screen Installations
In front screen installations, the projector and audience are positioned in front of the screen, which can be flat
or curved.
Flat screens offer a gain of about 1.0 with a viewing angle just less than 180°. This type of screen reflects
incident light equally in all directions so the audience can see the display from various angles.
Curved screens have a gain greater than 1.0 with a viewing angle much less than 180°. This type of screen does
not reflect incident light equally in all directions; instead it is concentrated in a viewing cone. The audience
sitting within the viewing cone area will see a brighter image than those sitting just outside the area.
Rear Screen Installations
There are two basic types of rear screens: diffused and optical.
A diffused screen has a surface which spreads the light striking it. Purely diffused screens have a gain of less
than 1.0. The advantage of the diffused screen is its wide viewing angle, similar to that of a flat screen for front
screen projection. This type of screen is suitable when a wide viewing angle is required but there is low
ambient room light.
Optical screens take light from the projector and redirect it to increase the light intensity at the front of the
screen. This reduces it in other areas. A viewing cone, similar to that of a curved front screen installation is
created. This type of screen is better suited for brightly lit rooms where the audience is situated within the
viewing cone.
J Series 1000W and 1200W User Manual
020-100706-02 Rev. 1 (03-2014)
F 2-8 F S
IGURE LAT CREEN
F 2-9 C S
IGURE URVED CREEN
Section 2: Installation and Setup
2-9