Re: ghosting with lenticular screens

[P3D Gregory J. Wageman <gjw@xxxxxxxxxx>]

Peter Abrahams asks:

>I would like to join the chorus & ask if anyone knows a reason that a
>lenticular screen would depolarize.   There are two possible reasons that
>come to mind.   Reflection at a steep angle, off the sides of the
>'lenticles', could reduce polarization.  Second, aluminum paint has many
>tiny particles, and if they 'show' in the texture of the dried paint, that
>would definitely depolarize by scattering.  It is possible that the
>'lenticles' make it harder for the aluminum particles to lay flat.

Certainly if there's any diffusion going on, you're going to get
depolarization.

Perhaps the increased ghosting is due to the brighter image from the
lenticular screen?  We had a debate long ago about how increasing the
contrast ratio would increase ghosting because of incomplete extinction
by the polarizers.  The suggestion was made to bring the room lights
up very slightly to reduce contrast somewhat.

	-Greg W.


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