Pagina 11 - Projecta Catalogue 2014 EN

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The importance of the
projection surface
The projection screen is an indispensable part of
any presentation or home entertainment
installation. Because, regardless of how good the
projector itself may be, the image always needs to
be projected onto a surface that allows multiple
viewers to see the graphics and comfortably read
Diffusion
A diffusion projection screen surface spreads
the light evenly and has a wide viewing angle.
Rather than reflecting the light as a beam,
the diffusion projection screen surface
disperses the light evenly and always
achieves a gain of close to the norm value of
1.0. The projector may be ceiling mounted or
placed on a table.
Reflective
A reflective projection screen surface reflects
the projected light from a ceiling-mounted
projector in a beam in the direction of the
viewer. The angle of incidence is the same as
the angle of reflection. Because of the beam
effect, the viewing angle reduces but the gain
increases.
Retro-Reflective
A retro-reflective projection screen surface
reflects the projected light from a table
supported projector in a beam in the direction
of the viewer. The light is reflected back in the
direction from which it originates. Because of
the beam effect, the viewing angle reduces
but the gain increases.
Diffusion Transmissive (rear projection)
In the case of a transmissive projection
screen surface, the image is projected from
behind the surface and is transmitted by
diffusion to the audience side. The projector
may be either mounted from the ceiling or
placed on a table.
Types of projection surfaces
Three factors play an important role in the choice of a projection screen surface: ambient light levels,
projector performance (output) and the placement of the projector. These variables need to be tuned
to each other in order to create an optimum display.
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the text. While the technical engineering of a good
projection screen partly focuses on operation and
installation, the projection screen surface is by far
the most important element. The choice of screen
surface type determines the screen’s ability to
handle the projected images.