|
|
This topic comprises 2 pages: 1 2
|
|
Author
|
Topic: RealD's Ultimate Screen
|
Frank Angel
Film God
Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
|
posted 10-25-2016 06:44 PM
Evidently RealD has produced a matte screen that is 2D/3D-compatible with very little of the hated hotspotting that plague standard silver screens but which still retain polarization BETTER than silver screens and with MUCH higher gain 2.8; they claim 85% more light than silver....yah, you heard right 85%!!, and with a much wider effective viewing angle to boot.
They have laser-cut, micro-micro perfs (150 micros) and claim it eliminates moire problems which seems to imply that the perfs are randomly made and not patterned. It also has a surface that can be WASHED!!
While this seems like manna from heaven for quality 3D -- the extra brightness alone would be a boon, if their claim about very substantial reduction in hotspotting if true, then 2D presentation would certainly benefit on this screen which till now has been significantly compromised by silver screens.
They also claim that because the surface is so much smoother than silver screens, it actually produces a sharper image in both 2D and 3D.
I mean, if you were selling your soul to the devil so you could have anything you wanted in a screen, what else could you possibly ask for? Well ok, I'd want it to be able to allow viewing 3D without glasses to silence those who find wearing glasses that are lighter than sunglasses to be akin to sitting on broken glass for two hours, and yah, I'd want it cheaper than silver screens, but you know even the devil can't do that!
Here is where you can hear the RealD rep explain the Ultimate Screen. Interesting is his take on screen vibrators that they use to get rid of speckle, evidently a problem with laser light engines. Any of you guy ever use a vibrator....on your screens?
RealD rep explaining their new Ultimate Screen
| IP: Logged
|
|
|
|
|
|
|
|
|
|
Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
|
posted 10-30-2016 07:35 AM
Point of fact, Real-D (as well as Master Image) rely on retaining polarization. Silver screens are the traditional way of doing that. However, there are now some special "white" screens that will retain polarization. They are called the "High White" and available in 1.4 as well as 2.0 gains.
http://strongmdi.com/products/highwhite/
I don't know how much stock I put in their charts on fall-off (they claim 40-degrees and 30-degrees for 1/2-gain). That seems to be in the realm of believable. Though their curve on the 1.4 seems "artist conception" based on my past experience with gain screens.
As for lamp life and percentage of power. No theatre uses lamp power to lower the light output to save lamp life. That is, they may size the lamp such that at minimum power they hit the proper light level and then as the lamp ages, increase lamp power to maintain that life. What the low-light theatres do is just undersize the lamp altogether.
What is worse, you are going to really see undersized lamps with laser. Lasers sound great but one has to take into account their decay over time. With xenon, yes they decay but you are constantly changing them so if sized right, you can maintain the proper light level over their life and even if you are cheap and undersized, at each lamp change you are back up to your maximum level. With lasers, they are rated based on 1/2 their lumen output. So if you size your laser right for when the projector is new, by definition, at 20,000-30,000 hours, you are at 1/2 brightness (7-fL or a "bright" 3D level and your 3D levels will be in the 2.5fL range). Since the minimum spec for cinemas is 11fL, you will be out of spec closer to 15,000 hours and perhaps as low as 10-12K hours. And, unlike xenon, it isn't a cheap proposition to change that laser (at this time) so that laser system is going to stay in until failure or until complaints reach a loud point. You are stuck with low-light for the last half of its "useful life." The key to lasers are to buy 1-size higher.
A key to lasers that one does not have with xenon is the ability to run the laser at a lower levels. So run the laser at 30% when it is new and as it decays gradually bring it up. You'll push that 20,000-30,000 mark to 50,000 to 80,000 hours or likely have the laser last the life of the projector and possibly the cinema. However, your costs are all up-front.
| IP: Logged
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
All times are Central (GMT -6:00)
|
This topic comprises 2 pages: 1 2
|
Powered by Infopop Corporation
UBB.classicTM
6.3.1.2
The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion
and agrees to release the authors from any and all liability.
|
Home
![[Smile]](smile.gif)
Printer-friendly view of this topic