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PICList Thread
'[EE]:LCD Shutter'
2000\08\23@103453 by Jim Stoll

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I'm looking for an LCD that can be used as an optical shutter - I envision
something about 10mm square that alternates between opaque and transparent
as the appropriate signal is applied.  It would need to be able to
oscillate at up to about 50Hz, but no faster than that.

Is anyone aware of something like this or something that could be adapted?

Thanks!!

Jim

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2000\08\23@110157 by John Pfaff

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I remember back in the early 80's the Sega Master System had 3D glasses that
used this technology.  It would flash the image on the screen as it
alternated between left and right eyes, giving each eye a different image
and causing the 3D effect.  Believe it or not, I still have them and they
still work.  As far as a supplier, I have no idea, I just thought I would
share this little tidbit.


{Original Message removed}

2000\08\23@111442 by Craig Lee

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www.princessauto.com used to have an lcd shutter.  It's screen was about the
size of a 14" monitor.  Check their surplus selection.

> {Original Message removed}

2000\08\23@121434 by Jean-Michel Howland

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>I'm looking for an LCD that can be used as an optical shutter - I envision
>something about 10mm square that alternates between opaque and transparent
>as the appropriate signal is applied.  It would need to be able to
>oscillate at up to about 50Hz, but no faster than that.
>
>Is anyone aware of something like this or something that could be adapted?

My Asus video card came with a set of glasses that as far as I know use
LCD's on each eye.

Looking at the Asus site now
(http://www.asus.com.tw/products/accessories.html) shows they have the
following for sale as an accessory:

90-C1VR01-0X    VR-100G         3D Glasses for ASUS AGP-V3800 TVR

The glasses (http://www.asus.com.tw/products/Addon/Vga/Agpv3800/index.html)
should be more than adequate in size.

Regards
Jean-Michel.

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2000\08\23@121641 by Lawrence Glaister

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I have a pair of 3d glasses I bought a few years ago known as
Simuleyes model de-vr with an fcc id of h2m0050001 with patent
number 5,117,302 listed on the label. These glasses have two shutters
approx 25x35mm and run at the rates you mention. A net search may find
the supplier, the fcc id can be used to locate some info from the fcc site
and the patent may help with design ideas for your project.
Hope this helps
=======================================================
Lawrence Glaister VE7IT             email: spam_OUTlgTakeThisOuTspamjfm.bc.ca
1462 Madrona Drive                  http://jfm.bc.ca
Nanoose Bay BC Canada
V9P 9C9
=======================================================
----- Original Message -----
From: John Pfaff <.....jpfaffKILLspamspam@spam@WABTEC.COM>
To: <PICLISTspamKILLspamMITVMA.MIT.EDU>
Sent: Wednesday, August 23, 2000 7:50 AM
Subject: Re: [EE]:LCD Shutter


> I remember back in the early 80's the Sega Master System had 3D glasses
that
> used this technology.  It would flash the image on the screen as it
> alternated between left and right eyes, giving each eye a different image
> and causing the 3D effect.  Believe it or not, I still have them and they
> still work.  As far as a supplier, I have no idea, I just thought I would
> share this little tidbit.
>
>
> {Original Message removed}

2000\08\23@123315 by Stephen B Webb

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> I'm looking for an LCD that can be used as an optical shutter - I envision
> something about 10mm square that alternates between opaque and transparent
> as the appropriate signal is applied.  It would need to be able to
> oscillate at up to about 50Hz, but no faster than that.
>
> Is anyone aware of something like this or something that could be adapted?

I think nVidia had some promotion for 3-D stereo shutter goggles which
were pretty cheap (if you bought it with the card...).  I would guess they
were larger tahn 10mm square, but they might just work for you.  (They are
capable of 60 Hz or better, I think)

-Steve

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2000\08\23@162442 by Lance Allen

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On 23 Aug 2000, at 10:25, Jim Stoll wrote:

> I'm looking for an LCD that can be used as an optical shutter - I envision
> something about 10mm square that alternates between opaque and transparent
> as the appropriate signal is applied.  It would need to be able to
> oscillate at up to about 50Hz, but no faster than that.
>
> Is anyone aware of something like this or something that could be adapted?
>
A company called Aoptic (http://www.aoptic.com) make an extensive
range of LCD shutters.
The common(most popular) 1 inch square unit is good for 100uS full
light to dark transition.
BUT BUT BUT... I could not get them to respond to my requests for
a price despite numerous attempts.. so good luck.
_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand

http://www.psych.auckland.ac.nz

_____________________________

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2000\08\23@163734 by Bob Ammerman

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This is what's in those glasses that let you see full-color 3D on a single
monitor. The LCD shutters are synced to the monitor refresh so the left and
right eyes are shown alternate frames from the monitor.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

{Original Message removed}

2000\08\23@210437 by 772-3129

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> I'm looking for an LCD that can be used as an optical shutter - I
envision
> something about 10mm square that alternates between opaque and
transparent
> as the appropriate signal is applied.  It would need to be able to
> oscillate at up to about 50Hz, but no faster than that.
>
> Is anyone aware of something like this or something that could be
adapted?

I don't know where to run out and buy it, but this is exactly what is used
in some sterio viewing systems.  Special glasses with liquid crystal
shutters allow only one eye at a time to see the screen, which is
synchronized with special display hardware or software that displays the
views for each eye on alternate video frames.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, .....olinKILLspamspam.....cognivis.com, http://www.cognivis.com

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2000\08\23@210624 by 772-3129

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> > I'm looking for an LCD that can be used as an optical shutter - I
envision
> > something about 10mm square that alternates between opaque and
transparent
> > as the appropriate signal is applied.  It would need to be able to
> > oscillate at up to about 50Hz, but no faster than that.
>
> http://www.princessauto.com used to have an lcd shutter.  It's screen was about
the
> size of a 14" monitor.  Check their surplus selection.

You need to be careful here.  Many of the screen sized shutters do not
switch between transparent and opaque, but rather between left and right
handed polarization.  These types of shutter screens are used in stereo
viewing systems where you wear passive glasses.  One eye has a right
handed polarizing filter, the other a left handed.

If you're curious, you can check out these kinds of products from the
StereoGraphics web site, http://www.stereographics.com if I recall correctly.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, EraseMEolinspam_OUTspamTakeThisOuTcognivis.com, http://www.cognivis.com

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2000\08\24@164129 by Peter L. Peres

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I just saw a PC equipped with a special graphics card and such glasses
(and played with it - the 3D effect is great and not at all tiring!). The
card and glasses are made by ELSA.

Peter

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