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Author Topic: Laser Projectors Jarod Reddig Jedi Master Film Handler Posts: 513 From: Hays, Ks Registered: Jun 2011 posted 03-26-2019 01:41 PM                     Being that we see everything with our eye our retina is probably the biggest to blame, especially since DLP inherently has it and it must be brought down to a level not detectible. Just like 24fps.  |  IP: Logged Andrew Carr Film Handler Posts: 26 From: Toronto, ON Canada Registered: Jan 2016 posted 03-29-2019 11:17 AM                        Does anyone have links to speckle reduction systems? I've seen a couple of different screen shaker systems, some more elaborate($) than others. Also, I've read about vibrating/rotating/polarizing lenses that mount in front of projectors but can't find pricing or availability. We build theaters and most of our upcoming project will require RGB lasers. Our standard is passive, dual head 3D so I'm also concerned as to how these systems will affect our 3D polarization.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 03-29-2019 01:10 PM                     Silver screens and RGB Lasers? Google 'speckle reduction projection' and you will find loads of papers on the topic. http://www.siliconlight.com/wp-content/themes/siliconlight/pdf/speckle-spie.pdf I don't think you can just buy 3rd party options to aid in speckle reduction. The largest part of speckle reduction lies in the projector, then i'd say screen surface. - Carsten  |  IP: Logged Andrew Carr Film Handler Posts: 26 From: Toronto, ON Canada Registered: Jan 2016 posted 03-29-2019 01:19 PM                        Yep, I've been reading a lot about it but am having a hard time finding actual products, screen shakers specifically. We use Christie mostly and see that they are starting to use wavelength diversity to combat the issue. Our screen manufacturer is able to provide frames and brackets for shakers but not shakers themselves. Just trying to figure out who manufactures shakers, general cost, etc.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 03-31-2019 03:54 PM                     Maybe there are some offers at Cinemacon. You should probably also contact Christie, Barco and NEC, as they should be familiar with methods and suppliers. As far as I know, screen shaking for speckle reduction is or was under a RealD patent. - Carsten  |  IP: Logged Pete Naples Phenomenal Film Handler Posts: 1565 From: Dunfermline, Scotland Registered: Feb 2001 posted 03-31-2019 04:12 PM                     Christie showed me shakers when I was their UK facility recently.  |  IP: Logged Kevin Fairchild Expert Film Handler Posts: 125 From: Kennewick, WA, USA Registered: Oct 2008 posted 03-31-2019 04:27 PM                     Dolby uses the screen vibration system from Christie. Here’s the links to Dolby’s training videos. https://vimeo.com/253704573 https://vimeo.com/253706997  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 03-31-2019 06:32 PM                     good grief... - Carsten  |  IP: Logged Andrew Carr Film Handler Posts: 26 From: Toronto, ON Canada Registered: Jan 2016 posted 04-01-2019 12:50 PM                        Thanks for those videos. I'm wondering how long until projector technology eliminates the need for screen vibration? Also, I sure hope those things are quiet! I can't imagine people in the future saying: "I remember movie theaters when I was a kid. The smell of popcorn, the hum and rattle from the screen vibration system... ah, those were the days."  |  IP: Logged Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 04-01-2019 03:38 PM                        That's interesting because Barco doesnt use screen shakers and I did not seen speckle on the 17BLP I installed or the two big lasers we used last year at cinemacon?  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 04-01-2019 03:47 PM                     Every manufacturer has his own secrets or patents to reduce speckle. Maybe Barco has a better in-projector scheme than Christie. - Carsten  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 04-01-2019 03:59 PM                     quote: Sean McKinnon That's interesting because Barco doesnt use screen shakers and I did not seen speckle on the 17BLP I installed or the two big lasers we used last year at cinemacon? The DP4K-17BLP is an LP machine, not a 3/6P system. Like explained in this topic already, those laser-phosphor based machines usually don't show a lot of speckle. quote: Also, I sure hope those things are quiet! The ones I've encountered up until now are pretty much inaudible.  |  IP: Logged Alan Gouger Jedi Master Film Handler Posts: 501 From: Bradenton, FL, USA Registered: Jul 2000 posted 04-01-2019 06:23 PM                        Here is an alternative despeckle system. Very inexpensive in comparison to the shakers. I have installed one of their system's, works great. http://www.audiwave.com/page118?product_id=119  |  IP: Logged Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 04-02-2019 12:34 AM                        I think they do Carsten. I was responding to Tom who seemed to indicate that shaking the screen was the only way. Clearly Barco has found another way. The RGB's I have seen/used from Barco looked just as good or better than Christies with a screen shaker.  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 04-02-2019 12:40 PM                     quote: Alan Gouger Here is an alternative despeckle system. Very inexpensive in comparison to the shakers. I have installed one of their system's, works great. Well, that's an ultra-sound screen shaking system, much like what IMAX uses. In the end, it still shakes the screen, the means of actuation is sound instead of physical contact. This particular solution seems to be a Chinese solution, complete with Chinglish marketing. quote: Sean McKinnon I think they do Carsten. I was responding to Tom who seemed to indicate that shaking the screen was the only way. Clearly Barco has found another way. The RGB's I have seen/used from Barco looked just as good or better than Christies with a screen shaker. Tom works for Barco, so you may expect he knows what he is talking about. But I think you misunderstood him. Tom mentioned that shaking anything other than the screen will not get rid of speckle. There are certainly different methods to reduce speckle inside the light source and light engine and that's what multiple manufacturers are doing, all using their own set of solutions, but they do not necessarily involve a lot of shaking.  |  IP: Logged

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