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'[EE] And where do you attach the car battery?'
2007\03\27@140710 by David VanHorn

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tech.monstersandcritics.com/news/article_1283503.php/Texas_Instruments_announces_cell_phone_DLP_projector


Frankly, I'm skeptical.  Putting lumens on a wall is one of those basic
physics things, like boiling coffee.
You either have the watt-seconds, or you don't..

2007\03\27@142427 by M. Adam Davis

face picon face
I believe you're right, and at this point it's more a marketing ploy
for their DLP business than anything.  If the market for tiny
projectors takes off, though, they'll have an offering.

Still, it doesn't take _that_ much power to throw some light on the
average (non-sunny) wall.  A 1W luxeon is bright enough for a 4" to
20" display especially with DLP.

The laser bit is interesting though.  I recall reading something about
a 1 pixel DLP with laser projector.

If they modulate the laser with a good switcher/pwm then they can have
fairly decent brightness with low consumption for many types of
images.

-Adam

On 3/27/07, David VanHorn <spam_OUTdvanhornTakeThisOuTspammicrobrix.com> wrote:
> http://tech.monstersandcritics.com/news/article_1283503.php/Texas_Instruments_announces_cell_phone_DLP_projector
>
>
> Frankly, I'm skeptical.  Putting lumens on a wall is one of those basic
> physics things, like boiling coffee.
> You either have the watt-seconds, or you don't..
> -

2007\03\27@172536 by Jinx

face picon face
> And where do you attach the car battery ?

Media-release guy's nuts ?

Dance ad-man, dance



2007\03\28@040434 by Alan B. Pearce

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> http://tech.monstersandcritics.com/news/article_1283503.php/Texas_Instruments_announces_cell_phone_DLP_projector
>
>Frankly, I'm skeptical.  Putting lumens on a wall is one of those basic
>physics things, like boiling coffee.
>You either have the watt-seconds, or you don't..

And in view of Russells recent moan about projector bulb prices, I wonder
what replacement lighting for this would cost - I have difficulty imagining
enough light out of LEDs for it.

2007\03\28@082007 by michael brown

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Alan B. Pearce wrote:
>> tech.monstersandcritics.com/news/article_1283503.php/Texas_Instruments_announces_cell_phone_DLP_projector
>>
>> Frankly, I'm skeptical.  Putting lumens on a wall is one of those
>> basic physics things, like boiling coffee.
>> You either have the watt-seconds, or you don't..
>
> And in view of Russells recent moan about projector bulb prices, I
> wonder what replacement lighting for this would cost - I have
> difficulty imagining enough light out of LEDs for it.


I don't know.  I have a front projector and with 200W it illuminates
>4000 sq. inches very nicely.  :-)  ISTM that 1W should perform just as
well on 20 sq inches.  Aren't LEDs more efficient than that arc lamp
thingy in my projector?

BTW, front projection technology has really come along.  Seems like the
best kept secret in home theater to me.  Bang for the buck is incredible
with DLP, as long as you don't see the rainbows.  ;-)

2007\03\28@104112 by Howard Winter

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On Wed, 28 Mar 2007 09:24:53 +1200, Jinx wrote:

> > And where do you attach the car battery ?

You have to wear the special trousers!  :-)

Cheers,



Howard Winter
St.Albans, England


2007\03\28@112329 by William Couture

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On 3/28/07, Howard Winter <.....HDRWKILLspamspam@spam@h2org.demon.co.uk> wrote:
> On Wed, 28 Mar 2007 09:24:53 +1200, Jinx wrote:
>
> > > And where do you attach the car battery ?
>
> You have to wear the special trousers!  :-)

But what if you are wearing the wrong trousers?  :)

Bill

--
Psst...  Hey, you... Buddy...  Want a kitten?  straycatblues.petfinder.org

2007\03\28@155249 by Brooke Clarke

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face
Hi:

A thought.

The TI DLP technology is based on tipping mirrors.  So it would be
possible to make a projection set that reflected the Sun onto a surface,
not as an image of the Sun but rather as a video image.  This would not
look like a flat mirror but a two port device that takes in light on one
port and an output port where the image squirts out.  Instead of the Sun
a local light source might be used.

Have Fun,

Brooke Clarke - currently playing with High Brightness LEDs.  Note that
the efficiency decreases as the current increases.  A K2 LumiLED driven
at it's max of 1.5 amps is 24 L/W, but at 350 ma is 46 L/W.

--
w/Java http://www.PRC68.com
w/o Java www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com

2007\03\28@162414 by David VanHorn

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On 3/28/07, Brooke Clarke <brookespamKILLspampacific.net> wrote:
>
> Hi:
>
> A thought.
>
> The TI DLP technology is based on tipping mirrors.  So it would be
> possible to make a projection set that reflected the Sun onto a surface,
> not as an image of the Sun but rather as a video image.



Ok, assuming that's right, the sun moves roughly 15 degrees per hour, so
assuming no clouds or other glitches, I'd need to track 30 degrees during a
movie.

I just don't see this happening in anything cell-phone sized.
I'm also dubious about making a picture that I'd call watchable with just
the 1-sun illumination on that small element, spread out to reasonable
viewing size, competing against all the ambient light that would be present.

2007\03\28@165923 by William Chops Westfield

face picon face

On Mar 28, 2007, at 1:24 PM, David VanHorn wrote:

> I'd need to track 30 degrees during a movie.
>

What movie?  All a cell-phone DLP needs to do to be commercial
success is project powerpoint slides...

BillW

2007\03\28@174131 by Gerhard Fiedler

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William ChopsWestfield wrote:

>> I'd need to track 30 degrees during a movie.
>
> What movie?  All a cell-phone DLP needs to do to be commercial success
> is project powerpoint slides...

And MTV clips :)

Gerhard


'[EE] And where do you attach the car battery?'
2007\04\02@140737 by alan smith
picon face
Evans & Sutherland was building a laser projector, both military simulations and commercial movie houses applications.  Not sure what ever came of it since the groups split off and were sold.

"M. Adam Davis" <.....stienmanKILLspamspam.....gmail.com> wrote:  I believe you're right, and at this point it's more a marketing ploy
for their DLP business than anything. If the market for tiny
projectors takes off, though, they'll have an offering.

Still, it doesn't take _that_ much power to throw some light on the
average (non-sunny) wall. A 1W luxeon is bright enough for a 4" to
20" display especially with DLP.

The laser bit is interesting though. I recall reading something about
a 1 pixel DLP with laser projector.

If they modulate the laser with a good switcher/pwm then they can have
fairly decent brightness with low consumption for many types of
images.

-Adam

On 3/27/07, David VanHorn wrote:
> http://tech.monstersandcritics.com/news/article_1283503.php/Texas_Instruments_announces_cell_phone_DLP_projector
>
>
> Frankly, I'm skeptical. Putting lumens on a wall is one of those basic
> physics things, like boiling coffee.
> You either have the watt-seconds, or you don't..
> -

2007\04\05@091723 by Howard Winter

face
flavicon
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Alan,

On Mon, 2 Apr 2007 11:07:31 -0700 (PDT), alan smith wrote:

> Evans & Sutherland was building a laser projector, both military simulations and commercial movie houses
applications.  Not sure what ever came of it since the groups split off and were sold.

Thinking about this:  aren't lasers inherently monochromatic?  If so, they would make really poor colour projectors
unless you use a three-gun approach with each being pure red, green blue.

Cheers,


Howard Winter
St.Albans, England


2007\04\05@132720 by Herbert Graf

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face
On Thu, 2007-04-05 at 14:16 +0100, Howard Winter wrote:
> Alan,
>
> On Mon, 2 Apr 2007 11:07:31 -0700 (PDT), alan smith wrote:
>
> > Evans & Sutherland was building a laser projector, both military simulations and commercial movie houses
> applications.  Not sure what ever came of it since the groups split off and were sold.
>
> Thinking about this:  aren't lasers inherently monochromatic?  If so, they would make really poor colour projectors
> unless you use a three-gun approach with each being pure red, green blue.

That's exactly what they're doing these days. Three lasers pointed at a
DLP chip. Reason for the push is the "rainbow" effect due to the single
light source and colour wheel used in current DLP sets.

It used to be hard to get solid state lasers of colours other then IR
and RED, but thanks to the push from optical media (DVD uses red,
HDDVD/BluRAY use blue, I've seen lots of green lasers but I don't know
of a commercial app that uses them) it's gotten much more common.

TTYL


'[EE] And where do you attach the car battery?'
2007\07\06@192618 by Hector Martin
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face
Herbert Graf wrote:
> It used to be hard to get solid state lasers of colours other then IR
> and RED, but thanks to the push from optical media (DVD uses red,
> HDDVD/BluRAY use blue, I've seen lots of green lasers but I don't know
> of a commercial app that uses them) it's gotten much more common.

Big green lasers are used in the medical industry IIRC. Green is still a
pain for small devices though. While red can be produced by a teensy
(read: sub-mm^3) chip, and blue is similar although very expensive
currently (but that will certainly change), as far as I know green is
not possible using a plain laser diode. You need a very powerful
(relatively) IR laser (or other bright light source really, but most
common is a laser), an Nd:YAG crystal to lase at twice the green
wavelength (deep IR), and a KTP frequency doubler, all lined up in a
cavity, with the appropriate lenses. I don't think that can be produced
in much less than, say, a 12mm by 5mm barrel, plus driving circuitry,
and that's already pushing it (and it would only work at low power
levels, since it is very inefficient). The modules you usually see in
green laser pointers are along the lines of 25mm by 10mm.
--
Hector Martin (EraseMEhectorspam_OUTspamTakeThisOuTmarcansoft.com)
Public Key: http://www.marcansoft.com/marcan.asc

2007\07\06@192741 by Hector Martin

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face
And ladies and gentlemen, this is what happens when you forget you're
reading a three-month-old thread. Duh.

Hector Martin wrote:
{Quote hidden}

--
Hector Martin (hectorspamspam_OUTmarcansoft.com)
Public Key: http://www.marcansoft.com/marcan.asc

2007\07\06@193508 by Dario Greggio

face picon face
Hector Martin wrote:
> And ladies and gentlemen, this is what happens when you forget you're
> reading a three-month-old thread. Duh.

LOL!
interesting anyway :)

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