Screen Requirements - ViewSonic Office Theater PJ820 User Manual

Screen requirements

The ViewSonic PJ820 projects images onto flat screens. However, the brightness and viewable range varies
with each type of screen. Selecting a screen with characteristics that are suitable for the intended use is
important.
Screen Type
Polarized screen
White screen
Silver screen
Beaded screen
Maximum
brightness
Flexible
translucent screen
Rigid-type
translucent screen
Getting Started
6
Because the surface of the screen has been treated to make it
polarized, it will only reflect light from a single direction.
Consequently, if you use such a screen with an LCD projector, a
clear image can be obtained even in bright rooms because the
screen hardly reflects any extraneous light.
This type of screen can be seen from anywhere, so there are no
limits on the viewing position. However, the surrounding walls
should be darkened as in a movie theater, otherwise a clear picture
cannot be obtained.
This type of screen is recommended when the projector is
suspended from the ceiling. This type of screen gives a picture 2-4
Ceiling
times brighter than a white screen. A variety of types are available
from different manufacturers, and each type has different
brightness characteristics. Some also have restrictions on the
possible range of viewing positions.
Maximum
Care should be taken with screens that have a high gain, as these
brightness
types of screen can cause color distortion at the left and right
edges.
This type of screen is recommended when the projector is placed
on the floor. This type of screen is similar to the silver screen,
Reduced
except that no color distortion occurs at the left and right edges.
brightness
Moreover, most of the light is reflected at the same angle as the
angle of incidence.
Floor
This type of screen is made of PVC (polyvinyl chloride). It has the
same characteristics as silver screens, but sometimes has hot spots.
This type of screen is made of acrylic plastic. It is extremely
durable and has excellent optical characteristics. It performs the
same as silver screens.
Screen Characteristics
ViewSonic PJ820