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Anonymoose

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Posted on Monday, February 27, 2006 - 3:58 pm:   Edit PostDelete PostView Post/Check IPPrint Post

For those of you who have tried 3D glasses on LCD monitors...How does cross talk (ghosting) compare to CRT monitors?

I have heard that even the fastest LCD monitors still have visible "trailing" in fast moving (2D) images due to incomplete pixel changes between fields/frames. This is somewhat analagous to phosphor persistance on CRTs and would tend to result in crosstalk due to incomplete changeover from one image to the next in 3D page flipping modes.

Has anyone taken a good look at this or measured it?
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qsdfg

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Posted on Monday, February 27, 2006 - 8:50 pm:   Edit PostDelete PostView Post/Check IPPrint Post

3D glasses on LCD ,does not work
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Scott Warren

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Posted on Monday, February 27, 2006 - 9:15 pm:   Edit PostDelete PostView Post/Check IPPrint Post

What kind of 3d glasses are you talking about gsdfq?

1. Anaglyph (Red/Blue, Red/Cyan, ColorCode-Blue/Yellow) glasses will work fine.

2. Linear Polarized glasses won't work on standard LCD screens, although there are a few experimental models that can work with polarized glasses. Don't know about Circular Polarized...

3. LC shutter glasses WILL work, but the type of LCD screen you have may determine how much motion-trailing and ghosting you get. You want an LCD screen that has fast enough refresh.

4. Barrier/Anamorphic/Mirror glasses might work OK, as long as you keep your head exactly centered and perfectly still!

Scott
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David Kendrick

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Posted on Tuesday, February 28, 2006 - 6:03 am:   Edit PostDelete PostView Post/Check IPPrint Post

Scott, I believe you are mistaken. Anaglyph will work, but that's the only method available that's compatible with LCD. Shutterglasses don't work because LCD monitors convert incoming video signals to their own internal refresh rate. Shutterglasses can't sync to this refresh rate causing the user to see both images with both eyes. Polarized glasses work, but only with specially constructed LCD monitors that are designed to work with them.
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Scott Warren

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Posted on Tuesday, February 28, 2006 - 9:17 pm:   Edit PostDelete PostView Post/Check IPPrint Post

Tell that to E-Dimensional.
They have a specific driver for use with LCD monitors.
http://www.edimensional.com/download/GlassesManualv4.25.pdf
They do have a caveat included in the article, about low "refresh" rates of LCD's and the perception of flicker.

Now, granted LCD's are --currently-- a bad choice for shutterglasses, but they aren't inherently incapable of high "refresh" rates. The LC's that are in the monitors aren't that different from the LC's in the shutterglasses themselves, and THEY can work at high enough frequencies.
and, LCD monitor "refresh" values and response times in general are improving all the time.

Otherwise, you pretty much agreed with me (re: anaglyph & polarized). I don't believe the original poster actually said anything about incoming video signals; this could be in reference to 3d modeling, or medical imaging, or stills.

Scott
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david6768

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Posted on Wednesday, March 01, 2006 - 7:33 pm:   Edit PostDelete PostView Post/Check IPPrint Post

I can tell you from experience that the Hitachi CP-S225 projector does not work with shutterglasses, even when using Edimensional's drivers. It is an LCD projector. Nor does my Sony LCD monitor. I would say that it is all just a marketing ploy to state that they work with LCD displays . The drivers may work with one LCD display in the world so they just claim they are compatable. Just my two cents.
David
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Hornet

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Posted on Wednesday, March 01, 2006 - 8:08 pm:   Edit PostDelete PostView Post/Check IPPrint Post

Hi,
after my tests with LCD projector (Panasonic )with shutterglasses I think: the refresh freq on PC must by adjusted in control panel on max refresh of projector. The eventually refresh rate lock on projector mus by in off position (some projectors have this function).
The main problem is the rel.lower refresh of this projectors (60-62hz) and heavy flicker in bright pictures. The 3D stereo with e-dim shutterglasses is great also with projectors, only more better with the DLP projectors.
Testing, and the initial troubles with 3D stereo are more and more back paying after succes.
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ajay501

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Posted on Thursday, March 02, 2006 - 2:43 am:   Edit PostDelete PostView Post/Check IPPrint Post

Hornet, I agree! The Optoma EP745, a DLP projector works well with 3D shutter glasses in my setup. No flicker, no ghosting. Nice and bright. Only problem is that it inverts the left/right parallax if you have nVidia stereo drivers. But there is a hardware fix - now it works very well.
There is more discription of the setup at my web site http//www.3dflightsim.com
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Anonymoose

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Posted on Friday, March 03, 2006 - 9:40 pm:   Edit PostDelete PostView Post/Check IPPrint Post

Sorry for not getting back to this thread sooner.

My original question was related to using LCD shutter glasses to view desktop LCD monitors. I had seen edimensional's advertisements about their shutter glasses being compatible with LCDs, and I had seen posts by people who successfully tried glasses with LCD monitors, but I have not found any mention of ghosting levels.

So my original question still stands in clarified form: is there anyone out there who has tried shutter glasses with LCD monitors and who can tell me how the ghosting levels compare to CRT monitors?

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