[simpits-tech] Ideas for out-the-window visuals?

Sat, 7 Dec 2002 08:09:05 -0500

Here are some links on building your own LCD projector. I haven't tried any
of this, since I am no where near this stage. At one point there was a very
long and involved thread in a forum dedicated to this. I can't find that
anymore. The goal was to build one for well under 1000 $US. Folks were using
Halide bulbs, florescent bulbs. the origin was a fellow trying to using many
bright white LEDs. It didn't throw enough light. Never did get to finish
reading the full thread.

http://www.hommie.net/index.htm
http://fender410.tripod.com/
http://www.dreamlash.com/DIY/
http://www.greenspun.com/bboard/q-and-a-fetch-msg.tcl?msg_id=006hui
http://www.geocities.com/vincetronic/videoprojectorinfo.html

Chris Crowley

-----Original Message-----
From: simpits-tech-admin@simpits.org
[mailto:simpits-tech-admin@simpits.org]On Behalf Of Joseph Fagner
Sent: Saturday, December 07, 2002 12:13 AM
To: simpits-tech@simpits.org
Subject: RE: [simpits-tech] Ideas for out-the-window visuals?

>From what I remember reading in my Home Theater magazines, Big screens
are pretty much CRT projectors that throw the image to the back of the
screen.  As with front throw models, both need a well controlled area of
light (or really the ability to control ambient light) to produce a
sharp, bright image and both have to be certain distances from the
screen to produce a certain sized image.  In a front throw CRT
projector, you have to control the room's lighting.  In a big screen,
the lighting is controlled by the big box enclosure.  In a CRT front
throw, the image size (for the most part) is controlled by how far away
you place the projector from the screen.  In a big screen, you have to
make up that distance in a very narrow enclosure and this is done by
bouncing the image off of several mirrors, thus making up the cumulative
distance of several reflections.

Most good big screens use first surface mirrors (i.e. the mirrored
coating is put on the front of the glass instead of the back (like your
bathroom mirror).  This prevents the ghost image that is produced when
you use a second surface mirror.  The front of the glass will reflect a
small amount of the light being projected to it and this creates a
second (ghost) image.  Because of the glass thickness, the image will be
displaced somewhat on the screen.

If any or all of this is incorrect, please someone jump in.  I am having
to dust off many cobwebs from the physics optics I took in college many
years ago.

Jay

-----Original Message-----
From: simpits-tech-admin@simpits.org
[mailto:simpits-tech-admin@simpits.org] On Behalf Of Sean Galbraith
Sent: Friday, December 06, 2002 2:30 AM
To: simpits-tech@simpits.org
Subject: RE: [simpits-tech] Ideas for out-the-window visuals?

At 02:01 AM 12/6/02 -0600, you wrote:
>How about going to TV repair shops and chewing the fat with the guys
>there to see if you can get inside some busted big screens and
snatching
>the mirrors out of those guys.  Most of the newer TV's use first
surface
>mirrors and since the TV's are not repairable (for whatever reason), no
>one going to use those mirrors for much, might get them pretty cheap.
>
>Jay

<Bigscreen_novice>

So how exactly do big screen's work?  I dunno nothing about them....sad
really since my wife sells the things!

Sean.

>-----Original Message-----
>From: simpits-tech-admin@simpits.org
>[mailto:simpits-tech-admin@simpits.org] On Behalf Of Rob Hommel
>Sent: Friday, December 06, 2002 1:54 AM
>To: simpits-tech@simpits.org
>Subject: Re: [simpits-tech] Ideas for out-the-window visuals?
>
>Sean
>
>As a matter of fact yes I have tried this and done that got the T-shirt
>etc.
>The reason no mention of it is that the amount of light produced by a
>monitor is insufficient to cast a bright image. In a very dark room
was
>able to cast an image of insufficient illumination to matter.
>
>I am very glad to see you folks thinking sideways about some of the
>problems
>involved in imaging for the Sims. I would really like to see a little
>experimentation. I have not done it all, tried it all I have done what
>my
>little pea sized brain could do on a very limited budget.
>
>I look forward to seeing someone try magnifiers and mirrors to bring a
>monitor image to the forward view. Has anyone got a good source for
>front
>mirrored glass? A regular mirror will introduce a ghost image. A good
>alternative is if anyone can come up with a good way to cheaply mirror
>glass. Any telescope makers out there?
>
>Keep 'em Flying
>Rob Hommel
>----- Original Message -----
>From: "Sean Galbraith" <sean.g@paradise.net.nz>
>To: <simpits-tech@simpits.org>
>Sent: Thursday, December 05, 2002 11:15 PM
>Subject: Re: [simpits-tech] Ideas for out-the-window visuals?
>
>
> > At 01:54 AM 12/6/02 -0500, you wrote:
> > >Ever considered an LCD panel and overhead projectors? That seems
like
>it
> > >would be a good alternative to the $$$ LCD projectors. Also I
wonder
>if
>you
> > >could stick a monitor under an overhead projector (remove light
> > >etc)...................
> >
> > Problem with the LCD panel is...they are just not that common here
in
>NZ
>:(
> > On the monitor in a ohp idea, I don't think that a  monitor would
>produce
> > enough light to work very well, but then, I'm only guessing....
anyone
>done
> > this?
> >
> > S.
> >
> > _______________________________________________
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