The projection
screen - an indispensable element in the presentation chain
by
Otto Tromm
Product Marketing Manager
Projecta
www.projecta.nl
Diffusion screen fabrics
Optical properties: Diffusion screens distribute the projected
light evenly over a wide horizontal and vertical viewing area. The reflection
value (gain) is 1.
Applications: Diffusion screens are appreciated for their versatility. It is a perfect choice for any application which requires a wide viewing angle or where ambient light conditions are controllable.
Reflective screen fabrics
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Optical properties: Higher gain is achieved by using a special coating that reflects light over a smaller viewing area. Light rays projected on the screen will be reflected like in a mirror. Thus light arriving at a certain angle from the left will bounce off the screen at an equal and opposite angle to the right.
Applications: Reflective screen fabrics have been developed for projection applications which require both a wide viewing angle and enhanced gain. Higher gain is welcome if there is a great deal of ambient light or if low output projectors are used. Because of the reflective property, this screen fabric is especially suitable for applications in which the projector is mounted to the ceiling.
Retro-reflective
screen fabrics
Optical properties: Retro-reflective screen fabrics are characterised
by minuscule glass beads which are impregnated in the projection surface.
The result is unequaled brightness with a moderate viewing angle. A
retro-reflective screen reflects most of the projected light back to
the projector. The angle of incidence is the same as the angle of reflection.
Applications: Retro-reflective screen fabrics are perfectly suited for applications with a limited viewing angle and a great deal of ambient light. Moreover the best result is achieved when the projector is on the same level as the audience, since light rays are bounced back along the exact path they came in on.
Conclusion
The projection screen
is an indispensable element in the presentation chain. If you follow
these 4 steps, it is easy to determine which screen is right for your
situation:
1. Choose your screen type
2. Select the right screen size
3. Determine the format of the screen
4. Choose a screen fabric
If you still have additional issues, you can ask your supplier or go
to www.screenselector.com
Otto Tromm is product marketing manager at Projecta, www.projecta.nl.
You can write to him at tromm@projecta.nl.
For comments and questions on this and other articles, be sure to visit
our user forum.
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