Datasheet

36
installation
PROJECTION SCREENS
Subject to technical alterations, as well as to changes of the design and the colour
electrical – installed
The proper guideline for large-screen projection
How to choose the proper type of screen
Which screen is to be preferred fi rst of all depends on the application. For frequent shows in the same location a wall or ceiling screen –
manually or electrically operated, with or without frame – should be considered.
For shows in different locations a tripod screen resp. a portabe screen is the better solution.
How to choose the proper height of the screen (4:3)
 Height of the screen
= one sixth of its distance to the last row of seats
 Distance between the screen and the fi rst row of seats
= height of the screen x 1.5
 Minimum distance between the screen bottom and the fl oor
= 0.60 – 0.90 m for home cinema use
> 1.25 m if the audience is sitting
> 1.60 m if the audience is standing
How to choose the proper picture format
1:1
4:3
16:9
The light intensity refl ected by the projection screen is measured in
lux. For an optimal picture quality the ratio between the lux value of
the projected image and that of the room light should be at least 5:1,
or even better >10:1.
As a thumb rule the normal room light in conference rooms is
80 – 100 lux.
The light intensity refl ected by the screen should then be >500 lux.
How to choose the proper light output of the
projector
manual – installed framed screen tripod – mobile
Standard format
for overhead or
slide projection
Video format
for video presentations
or TV
Home cinema format
for DVD or HDTV
200 cm
height of the screen
125 cm
minimum distance
to the floor
800 cm
400 cm
Lumens (ANSI) projector
Lux = ———————————————— x refl ection value
wall surface in sqm
Lux = 100 slightly lit room
Lux = 400 normally lit room