Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!usc!apple!uokmax!norlin
From: norlin@uokmax.ecn.uoknor.edu (Norman Lin)
Newsgroups: sci.electronics
Subject: Monitor image projected onto screen/wall?
Summary: Can a monitor image be projected onto a large screen or wall?
Keywords: Monitor, lens, projection
Message-ID: <1990Nov7.060323.4482@uokmax.ecn.uoknor.edu>
Date: 7 Nov 90 06:03:23 GMT
Distribution: sci
Organization: Engineering Computer Network, University of Oklahoma, Norman, OK
Lines: 28

This isn't strictly "electronics" but this newsgroup seems to fit the subject
best...

A while ago in misc.forsale I noticed an ad for a gizmo that would project the
image from an ordinary television screen onto a large screen or a wall, thus
getting a "big screen" TV effect for little cost.  I didn't purchase it, but
the idea has intrigued me.

What I would like to do is somehow project the image from my computer monitor
onto the wall or ceiling; for instance, I have written a 3-d moving starfield
routine for my PC which would look absolutely stunning if projected onto
a huge wall or ceiling.  Also many screen saver programs have quite interesting
visual displays that would be impressive on a large scale.

What's needed to do such screen projection?  I was thinking that a simple
assembly such as that used for overhead projectors might be sufficient; i.e.
simply a lens (or 2 lenses and a mirror to deflect 90 degrees) to refocus and
project the image onto a wall or ceiling.  Would this alone be enough?  Would
the monitor's own brightness provide sufficient light to project a visible
image?  I've no experience with this sort of lens assembly, so any help would
be greatly appreciated.

Thanks in advance.
-- 
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