"where colors are produced by flashing red,
   green and blue in a high speed sequence,
   it can give people headaches."

How does this compare with the frame rates from,
say, a standard 'movie projector' - or how about
a TV or computer CRT monitors with their varying
scan rates?

I never recall getting a headache from watching/viewing
movies from a projector (and I once dissassembled a Bell
and Howell 16 mm projector and removed one blade from
the optical 'chopper' that doubles the 'blink' rate to
make a slightly better film chain for a small institutional
studio operation) -

- nor do I recall any problems from that (almost) bygone
era.


Jim




----- Original Message -----
From: "Jeff DeMaagd" <jeffdm@ISERV.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, April 12, 2002 8:07 AM
Subject: Re: [EE]: Build you own LCD projector?


> DLP systems have their own problems due to the inherent design of
> single-chip systems where colors are produced by flashing red, green and
> blue in a high speed sequence, it can give people headaches.
>
> Older DLPs were worse than equivalent LCDs from the time.  Only starting
> last year did have get better color, mostly from a darker black or better
> contrast ratio.  Right now, the one chip design also currently wastes
> considerably more light energy and have a shorter bulb life, often 1000
> hours for DLP vs 2000 or more for a lot of LCDs.
>
> Either way, I suggest leaving this up to pros to design and build, to do
> better than them would cost more.
>
> You can get relatively newer used SVGA units for $1000.  You can also get
a
> new Panasonic AE-100 - a 850x480 resolution widescreen projector from
Japan
> for about $1500 from pricejapan.com.  Its bulb is rated for 5000 hours in
> economode.  Read the projector forums at AVScience.com for more details.
>
> Jeff
>

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