scott wrote:
>> Looks nice, but the product information I have doesn't seem to 
>> indicate the presence of a VGA input...
> 
> Oh it definitely has one of those!

OK. Wouldn't be the first time Insight's product descriptions were vague 
and/or incorrect...

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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Invisible wrote:
> PS. Why do all the "DLP" projectors have 10x the contrast ratios of 
> "LCD" projectors??

In an LCD projector, there's a light bulb that shines through the LCD, 
which subtracts out the colors you don't want on the wall at that point.

In a DLP projector, there's a light bulb that bounces off microscopic 
movable mirrors that reflect the light onto the wall or not, depending 
on whether you want that color there.

So in a DLP, there's basically no filter in front of the light, and the 
"moving parts" don't absorb the light so they don't get hot as easily. 
(Not that they stay cool, but it's not their design goal to turn light 
into heat.)

-- 
Darren New / San Diego, CA, USA (PST)
  Helpful housekeeping hints:
   Check your feather pillows for holes
    before putting them in the washing machine.

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scott wrote:
> 
> Makes the image look square on the wall/screen, even if the optical axis 
> of the projector is not exactly perpendicular to it (good if the 
> projector is portable, not much use if it is going to be fixed).
> 

For fixed position lens shift rocks 100-0 over keystone. Only reasonable 
keystone is auto-keystone for portable projects. If keystone is manual, 
lens shift rocks over it, even on portable projector.

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Eero "Aero" Ahonen
    http://www.zbxt.net
       aer### [at] removethiszbxtnetinvalid

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> So in a DLP, there's basically no filter in front of the light, and the 
> "moving parts" don't absorb the light so they don't get hot as easily. 
> (Not that they stay cool, but it's not their design goal to turn light 
> into heat.)

So where does all the light go in a DLP projector when you display a black 
image?

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On Tue, 24 Jun 2008 09:16:04 +0200, "scott" <sco### [at] scottcom> wrote:

>> So in a DLP, there's basically no filter in front of the light, and the 
>> "moving parts" don't absorb the light so they don't get hot as easily. 
>> (Not that they stay cool, but it's not their design goal to turn light 
>> into heat.)
>
>So where does all the light go in a DLP projector when you display a black 
>image?
> 

LOL :)
-- 

Regards
     Stephen

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scott wrote:
> So where does all the light go in a DLP projector when you display a 
> black image?

It gets reflected the other direction, into blackness inside the 
projector. The trick is, the tiny moving bits where it's focused aren't 
absorbing it, but rather the big heat-sink with the cooling system (for 
movie projectors) or fan (for little projectors).

It's the difference between using a rescue mirror or a smoke signal. :-)

-- 
Darren New / San Diego, CA, USA (PST)
  Helpful housekeeping hints:
   Check your feather pillows for holes
    before putting them in the washing machine.

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>> So where does all the light go in a DLP projector when you display a 
>> black image?
>
> It gets reflected the other direction, into blackness inside the 
> projector. The trick is, the tiny moving bits where it's focused aren't 
> absorbing it, but rather the big heat-sink with the cooling system (for 
> movie projectors) or fan (for little projectors).

I guess in movie projectors it's more of a problem, but in office projectors 
I doubt enough heat is generated to affect the cooling design when there's a 
huge inefficient light source pumping out heat a few cm away.

Anyway, I guess you can always mount the absorbing imager onto a heat sink 
with some air flow if you really need to.

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