The LCD will be heated by the lamp.  LCDs are known for being heat
sensitive.  If it is an incandescent lamp a lot of its output is in the
infra red.  Some projectors use tiny arc lamps which produce less IR but
still a lot.  If you use a "cold mirror" type IR filter you can separate
most of the IR before it gets to the LCD.  Also look at "hot mirrors".

Sherpa Doug

> -----Original Message-----
> From: Colin Constant [mailto:Colin_Constant-NR@RAYTHEON.COM]
> Sent: Thursday, April 11, 2002 1:34 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Build you own LCD projector?
>
>
> Does the LCD need cooling in itself, or is it the heat of the
> lamp that causes
> the problems?  I don't get the part about the Infra Red
> filters  at all.  No,
> wait :-)  Are you saying that you need to filter the IR from
> the lamp before it
> gets to the LCD?
>
> Thanks,
> Colin
>
>
>
>
> I think the hardest part will the the LCD itself.  It will have to be
> fan cooled, probably using Infra Red filters too.  I see it
> as a thermal
> management project.
>
> Sherpa Doug
>
> > -----Original Message-----
> > From: Colin Constant [mailto:Colin_Constant-NR@RAYTHEON.COM]
> > Sent: Thursday, April 11, 2002 12:58 PM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: [EE]: Build you own LCD projector?
> >
> >
> > I would really like a smallish LCD projector.  Since LCD
> > projectors cost
> > thousands of dollars I thought it might be worthwile to build one.
> >
> > At first glance this might seem like a rehash of the "Build
> > your own PC" thread
> > but I think it might be a rather different situation.  I'm
> > thinking that the
> > price of projectors is partly dictated by low volumes.  Maybe
> > there's a lot of
> > labour involved.
> >
> > On the other hand the parts are probably expensive.  IIRC
> > even replacement
> > lamps can run to hundreds.  And, of course, the optics.
> >
> > Any thoughts?
> >
> > Colin
> >
> > --
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