Screens
Introduction
Purpose
General care
Rear projection
screens
The success of a presentation is greatly dependent on your use of the correct
screen in a serviceable condition. In extreme circumstances, however, a light
color wall may have to suffice.
A screen enlarges the image of a slide or transparency projected on it so that
it is legible to an audience. The two types of projection screens are the rear
projection, and the front projection screens. Rear projection screens are
translucent: therefore, the projector is invisible to the audience as it projects
an image through the screen. Front projection screens are reflective and
reflect the light image off the screen to the audience.
Keep a screen clean and free of tears. Protect a screen from abuse and stray
chalk or pencil marks. Unless it is permanently freed, roll the screen up and
store it properly between use.
Screens used in rear projection are found most often in permanent theater
setups. Many flag staffs have such facilities. Rear screen projection allows
the production personnel behind the scenes mobility. It also decreases
audience distraction created by the whirling of a projector motor. Most rear
projection screens have a matte surface. The image is projected directly on
the screen or reflected from large mirrors located behind and at a 45-degree
angle to the screen.
Front
projection
screens
Most front projection screens are the reflective type. The four types of
screens used for front projection are the lenticular screen, the high gain
aluminum screen, the beaded screen, and the matte screen. Select the type of
screen most appropriate to the room dimensions and desired angle of
projection. They may be portable units that roll or fold up for storage or
permanently freed to a ceiling or wall.
Lenticular
screens
Lenticular screens reflect light evenly including all room light and glare.
They appear to have a striped, ribbed, rectangular, or diamond pattern, and
they have a coating that gives them an enameled, pearlescent, granular, or
smooth surface. Lenticular screens have a 70-degree width by 20-degree
height angle of projection and are brighter than beaded and matte screens.
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