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Author Topic: Recommended Screen surfaces for Laser Danial Simmonds Expert Film Handler Posts: 107 From: Kota Damansara, Selangor, Malaysia Registered: Jan 2008 posted 07-19-2019 01:06 PM                        Hi Everyone, I would like to find out from anyone with experience on laser installs being laser phosphor or RGB, what type of screen surfaces has been used for 2D and 3D applications. How acceptable is the speckle with a silver 2.4 gain if using it for dual 2D/3D? Or does clarux performs better with laser or do you really need screen shacker? Is the Hi-White type of screens good enough for 2D with laser without screen shacker? What type of screen gains to limit in laser applications ?  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 07-19-2019 03:08 PM                     Most phosphor laser machines don't really have a lot of speckle and don't need any screen shakers at all. I'm afraid that a 2.4 gain silver screen with RGB laser will yield some terrible speckle. Usually, the projector manufacturer can give you some lists of screens they tested and what countermeasures are necessary for RGB laser setups. Barco, for example, claims that their 6P machines don't need screen shakers at all for most screen types. I've not yet seen them in production, but they claim the same for their new series 4 3P machines.  |  IP: Logged Andrew Carr Film Handler Posts: 26 From: Toronto, ON Canada Registered: Jan 2016 posted 07-23-2019 12:13 PM                        Strong MDI has a new high gain surface for laser projection: https://strongmdi.com/blog/introducing-premium-hga-1-7-screens-the-new-standard-for-laser-projection/ I've been told it will work for passive 3D applications depending on the application and media.  |  IP: Logged Muhamad Taufiq Film Handler Posts: 23 From: Bandung, Indonesia Registered: May 2015 posted 07-23-2019 01:00 PM                    I'm not a technician, so please take my post with a grain of salt. I have seen Barco 60L in 2 different cinemas, one with white screen and another with silver screen. The one with white screen, I can definitely see some speckle but most of the time there's no problem ignoring it. While the silver screen one definitely has a lot more speckle and it's kinda hard to ignore. For Christie CP4325-RGB, so far I've seen it in 5 different cinemas, all with white screen. There's some variation between cinemas, but generally speckle is a bit less than 60L with white screen, almost not noticeable. I'm pretty sure this projector won't be installed in any cinemas around here with silver screen, so I can't comment how it will perform with silver. As for Barco SP4K... well I'm still waiting for one to be installed. P.S. I don't know whether any of those cinemas use screen shaker or not  |  IP: Logged Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 07-23-2019 05:40 PM                        quote: Muhamad Taufiq The one with white screen, I can definitely see some speckle but most of the time there's no problem ignoring it. That was exactly my experience working in a venue with a 30L, too. It had to be a white screen, because film as well as digital projection had to be supported. The laser speckle was basically like changeover cues: if it's pointed out to you, you can't "undo" noticing it thereafter. But if it's not, most viewers notice the higher contrast range first and foremost, and aren't bothered by the slight speckle.  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 07-24-2019 12:23 AM                     quote: Muhamad Taufiq P.S. I don't know whether any of those cinemas use screen shaker or not It's indeed pretty impossible to tell without being able to look behind the screen or without being told. But afaik, Christie generally advises to install screen shakers with their RGB laser projectors. There are a few venues where it was seemingly omitted as the shaker setup seemingly doesn't work well with all screen configurations, especially uncommon geometry like deeply curved screens. Those in charge of marketing those projectors are seemingly not so fond of the need of screen shakers for some configurations, that's probably why they try to keep a lot of information regarding their use under wraps.  |  IP: Logged

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