know that in order to determine screen size for a
projected image, the distance the farthest members of
the audience will be sitting from the screen should be
the determining factor. After all, if the screen is
bigger, people can see it from further away.
We read that for auditoriums and conference rooms the
width of the screen should be at least 1/6 the distance
of the farthest spectator in the audience. For example
if the back row of an auditorium is 48 ft. away then the
width of the screen should be at least 8 ft. wide. This
rule of thumb is for minimum screen size. It is OK to go
larger. The important thing is to get a screen that is
large enough for the audience in the back row to view
Personally, we feel
that there are other determining factors, most notably
the fineness of the image on the screen. If people are
expected to see tiny figures, graphs, etc., it will be
more difficult, and the screen needs to be larger.
So as a rule of
thumb, we'd recommend 1/4 the size if possible. So if
the convention services person at the hotel wants to put
you into a room shaped like a bowling alley, you'd best
look for another room, because your people in the rear
of the audience will be way too far back.