View Full Version : Can LCoS do 3D with polorized filters?
rabident 04-10-07, 11:38 AM With 120hz SXRD panels on the way, there's still hope for shutter glasses, but I like the always on feel of polarized glasses. Plus they're just glasses - not clunky electronics worn on your face.
Anyway, with prices coming down I was wondering if a 2 x LCoS stack was an option for 1920 x 1080 3D display.
tstites 04-10-07, 11:51 AM Yes it is and we'll be showing an HD 3D system using two RS1's at our NAB booth. Either polarization or the Infitec system can be used with the RS1's
Cheers,
AnthonyP 04-10-07, 09:27 PM Cool, Tom.
I think the next thing is to get media that supoports it.
Just yesterday we were discussing it in the HD forum.
I was wondering if the "PiP"( second decoder) in the HD media disks could be used for this. (obviously with a new dual output player).
The nice thing with using PiP on HD media is that a person without the player or display that can support this will still watch a perfect 2d version of the movie.
So is JVC working on a dual output BD player to go with that display idea?
I guess I can dream :)
If you've seen JVC's 3D video game demo you got a treat. Maddon Football looks like you are standing on the field. Amazing
Catdaddy67 04-10-07, 09:46 PM Damn, what else do I need, aside from 2 RS1s a PS3 and an X360, for 3d gaming? 8)
Huckster 04-11-07, 08:13 AM Why do you need 2 projectors? How does DLP do this with one? Can't LCOS do the same?
AnthonyP 04-11-07, 06:56 PM depends what you want to do. polarization needs two. Crappy blue/red glasses can be done with one.
Huckster 04-12-07, 10:05 AM In the the 3D DLP theaters, they use cheap polarized glasses (not the crappy red/blue glasses) and one projector.
So why does LCOS require 2 projectors to do this?
tstites 04-12-07, 10:41 AM Huck,
Refresh on LCOS devices is currently not fast enough to do 120Hz rate (60Hz each eye). We can do lower refresh, but that's not generally acceptable for theatrical applications.
The systems used in cinemas use a ferro LCD shutter system that changes polarization at 120Hz, alternating polarization states for each eye. The system causes a huge hit in light output.
Huckster 04-14-07, 11:56 AM Thanks, Tom. I thought it might have something to do with needing polarized light for the LCOS to work at all and not being able to reverse the polarization for each eye.
A 120hz projector with shutters would only need one display unit. As the OP pointed out, you would need to wear glasses with shutters, but I've seen shutter glasses that are not that cumbersome. This would be much better than red / blue type systems, which I agree are not realistically usable for extended periods of time.
Maybe the DLP 3d systems used shutters? DLPs are capable of 120hz.
Mojo_LA 04-20-07, 10:32 PM And unless things have changed you also need a SILVER screen to do polarized 3D...
A 120hz projector with shutters would only need one display unit. As the OP pointed out, you would need to wear glasses with shutters, but I've seen shutter glasses that are not that cumbersome. This would be much better than red / blue type systems, which I agree are not realistically usable for extended periods of time.
Maybe the DLP 3d systems used shutters? DLPs are capable of 120hz.
Samsung is planning on giving its second-gen LED-based RPTV DLPs a 3D upgrade. The current line up is 3D-ready and come September, Samsung will sell a $100 package that'll include two 3D glasses and a 3D emitter that'll hook up to your DLP and display 3D content.
lovingdvd 04-28-07, 02:31 PM How far away are we from the day when select movies and sports events will be viewable in our HT in 3D. In-your-face type of 3D would be over the top for some things such as sports. However I could see some use of 3D to create a great "you are there" type of effect. Are we are few years away, or are we talking 10+ years for this?
JonStatt 04-30-07, 04:06 PM I would be happy to play some of my old 60Hz shutter glasses movies such as those shown in IMAX cinemas which I still have. However, the only sets I can watch this stuff on is my very old CRT TVs, of which I only have a 15" one left. Modern displays de-interlace when you dont want them to resulting in the two interlaced frames becoming one, or the forced double refreshing etc. I know there is a lot of noticeable flicker at these refresh rates, and poor resolution..but its still fun nonetheless.
How far away are we from the day when select movies and sports events will be viewable in our HT in 3D. In-your-face type of 3D would be over the top for some things such as sports. However I could see some use of 3D to create a great "you are there" type of effect. Are we are few years away, or are we talking 10+ years for this?
Well as you can see, the display technology is already here, the question is when will there be content? Current broadcast standards wouldn't really handle a proper 60fps 3d display stream, although a 720p stream for a movie has enough bandwidth in it (24fps native stream being displayed at 60fps) to display a 3d version without a quality hit. Blu-Ray and HD-DVD could also support 3d 1080p movies or 3d 1080p@30fps wrapped in a 1080p@60fps stream. If Samsung is really going to release a 3d LED DLP model, they probably have some ideas for the content.
mrehrer 04-30-07, 07:29 PM And unless things have changed you also need a SILVER screen to do polarized 3D...
What necessitates the silver screen? Does it have to do with keeping things correctly polarized or...?
Kevin McCarthy 04-30-07, 09:01 PM Yes. I do personal 3D slide shows with a pair of slide projectors, each with an internal polarizer (the two polarizers are at right angles). The screen is from Da-Lite, and has their silver fabric. It is required to preserve polarization; traditional screen fabrics would scramble the polarization and prevent the 3D effect from working.
Check out this article:
http://movies.ign.com/articles/784/784033p1.html
It gives a pretty nice outline of what is going on with 3D, and how Hollywood has big plans for it over the next several years. I have often wondered why SOMEONE couldn't come up with an "easy to implement" 3D solution for us Home Theater guys.
I have PERSONALLY seen 3D images on a 120HZ LCD monitor display -WITHOUT the need for glasses! The monitor had been modified for the 120HZ refresh rate, as it was not a standard refresh that your typical "off the shelf" production computer LCD would support at the time. It was a tech demo for a 3D tech company based out of Birminham Alabama a number of years ago. This must have been around 1998-1999 time frame. I don't know if they are even in business anymore. Their demonstration was neat and all, but I kind of got the feeling that they didn't really know what to do (or where to go to capitalize) on their "technology"...
Lee
Yes. I do personal 3D slide shows with a pair of slide projectors, each with an internal polarizer (the two polarizers are at right angles). The screen is from Da-Lite, and has their silver fabric. It is required to preserve polarization; traditional screen fabrics would scramble the polarization and prevent the 3D effect from working.
I've seen white screens for polarized 3d, so in itself, the silver color is not required. It just requires a surface that has a high retention of light polarization. There are paints out there with this characteristic. Now, anybody know of an off the shelf paint that would work? I'm not talking about those specialised $500 a gallon paint... but something you could find at home depot or lowes.
Mark Petersen 09-26-08, 04:47 PM If you've seen JVC's 3D video game demo you got a treat. Maddon Football looks like you are standing on the field. Amazing
Is this the only source material available? The technology itself sounds great but if there isn't source material available...
rabident 09-26-08, 06:34 PM Is this the only source material available? The technology itself sounds great but if there isn't source material available...
Nvidia has stereoscopic drivers for most of their cards. There's a forum dedicated to playing PC games in 3D here: http://mtbs3d.com/phpBB/index.php
Mark Petersen 09-26-08, 07:43 PM Nvidia has stereoscopic drivers for most of their cards. There's a forum dedicated to playing PC games in 3D here: http://mtbs3d.com/phpBB/index.php
Thanks for the link. Given that there will soon be a lot of used RS1's for sale soon this could be a good application for them. Maybe I'll pick up a second one and dedicate them to 3d gaming. :)
Mark Petersen 09-28-08, 06:46 PM Yes it is and we'll be showing an HD 3D system using two RS1's at our NAB booth. Either polarization or the Infitec system can be used with the RS1's
Cheers,
Tom, can you provide some more info about these systems? Once the RS10s and RS20s are out, RS1s will be a dime a dozen so it would be interesting to pick up a 2nd RS1 and play around with this stuff. If one has 2 RS1s what else do they need and where do they get it?
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