SILVER SCREENS FOR 3D

Ever heard of movies being up on the big silver screen? Movie screens were originally silver to compensate for the relatively dim projection systems of the time. A silver screen is more reflective, therefore brighter than a white screen. However, a silver screen will lose a lot of it's light as you view from the sides, but a white screen will be about the same brightness from all angles. Almost all movie screens these days are white, unless polarized 3D movies are being projected!

Movie screens are permanent installations, but many people would like to project 3D images at home or other locations. For this, one needs a portable silver screen (for passive polarized 3D). Unfortunately, this is one of the most difficult aspects of stereo presentation, as silver screens are difficult to produce, transport, erect and store!

NOTE: for REAR PROJECTION 
Da-Lite now has an RP screen called 3D Virtual Black. Looked good on a small demo, good extinction but flat gain. Have heard large sizes can exhibit "hot spotting", but have yet to see sample.

Check out these images for installation of an IMAX silver screen 22 x 27m (72 x 88ft)!

Da-Lite TRIPOD screen frame
Da-Lite FAST-FOLD screen frame
Da-Lite FAST-FOLD screen frame
with drapery
FRAMES

The easiest way to travel with a movie screen is with a TRIPOD screen. The only silver tripod screen we know of is made by Da-Lite and utilizes their Silver-Lite surface. This is a decent silver screen for the money, but for 50 people at the most on their largest Picture King screen (84x84"),

Da-Lite also offers a larger silver screen which attaches to a FAST-FOLD frame. Only their 3D Virtual Grey surface can be used on this frame, which we've found to be a bit dark and ghosty. The Fast-Fold frame folds down to fit in a relatively small case and is somewhat easy to set up and tear down. The Deluxe version is quite sturdy. The components are: frame, legs and crank screws (attaches legs to frame). An option that is available is for DRAPERY. Velvet drapes (top/valence, sides/wings, and bottom/skirt) surrounding the screen gives a very professional, theatrical look in any venue. The top is hung on valence hardware, sides on wing arms and the bottom on a special skirt bar or on "reverse" snaps along the bottom of the screen. Drapery comes in black or blue.

In order for screens to be stretched to the Fast-Fold frame, fabrics must be hemmed and snaps riveted in so they perfectly match the snaps on the frame. This is much easier and more accurate than the "lace and grommet" style of stretching that most other screen frames employ. It's advisable to get reverse snaps put in at the bottom of the screen to facilitate adding a skirt if needed.

Fast-Fold
frame
setup


MDI-STRONG also offers excellent quality silver screens.

They offer limited frame options for their 3D screens... for their "portable" Domino frame option the screen edge is grommted.

FRONT PROJECTION SCREEN FABRIC
(rear projection here)
Silver screens have two components: the base, and the coating. Important qualities are brightness, off-axis viewing, depolarization and transportability. All silver screens need to be rolled for transportation instead of folded, which makes for more difficult shipping. Fedex will take a rolled screen in a shipping tube (for screen rolled on short side) no more than maximum 118". There are several manufacturers of silver screen materials. STUDIO 3D has used most of these, and offers the following information based on actual tests.

NOTE!
Many older screens were ribbed vertically and were called LENTICULAR... this was to help distribute reflected light more evenly. These are NOT suitable for digital projection, as they lead to MOIRE patterns.
We know of no modern silver screens with lenticular surfaces.

MDI-STRONG
Excellent 3D screen surface but limited options for transportable frames If you want permanent frame, they've got the Monarch.

DA-LITE
Da-Lite offers two silver screen surfaces: SILVER LITE and VIRTUAL GRAY. Silver Lite is better, but only availble on tripod screens. Their "Virtual Grey" is not actually a silver screen, but it does preserve polarization... unfortunately our tests showed it to be quite dark, possibly 2 or more stops darker than most silver screens. I have a hard time believing their 1.85 gain claim! We also found it to be somewhat grainy.

STEWART
The STEWART SILVER 3D material is generally accepted as the Rolls Royce of 3D screens, with a price to match. Even if you were to fork over the huge money for the material, they will no longer sell material alone (to our knowledge). The frame they supply is their SNAPPER, which looks real nice, but does NOT FOLD or break down (four sides are solid). They also sell the Stewart 150 for rear projection.

HARKNESS SCREENS
Based in England, they now have a factory in the US (Virginia). Theirs is an excellent 3D screen material: good brightness, good extinction, and looks to be good portability, however- they used to have a frame called "Easi-Rect", like the Fast-Fold by Da-Lite, but seems to be no longer available.

HURLEY
Looks like they've gone out of business! 
We used Hurley screens for years. It is a seamed vinyl, called "SILVERGLO", but the seams are well hidden. The biggest problem is that the vinyl is very susceptible to "puckering" and permanent marks from improper rolling or storage. Once they are set in, they never want to stretch back out! Harkness and Steward vinyl is more stretchy, more forgiving. And the stiff Hurley vinyl if very sensitive to temperature- if it gets cold, the vinyl shrinks and it's that much tougher to get those snaps on. They have their own frame system, called the "H-Pad", which is built-up from small frame pieces that are fitted together (not as easy as Fast-Fold) with heavy plastic velcro instead of snaps. The problem is that there is a lot of play where the velcro attaches, so it takes a lot of extra time to get the screen nice and flat. Better to snap it to a Fast-Fold frame.
NEWS: Hurley has come out with a new silver material called "Digital Dimension". We've tested a small swatch and found extinction excellent, but compared to "SilverGlo", it's a bit darker and grainier.

SILVERFABRIC
This looks like a great screen material! The problem is, there is no US distributor for this German material. Importing something like this tends to get very ugly (and costly). As we have had some real nightmares importing screens, we have been reluctant to purchase a large sheet of the material for snapping to a Fast-Fold frame. The sample we have is a canvas based material which seems to be non-vinyl material available. It doesn't stretch, but it does tend to lay flat

TRIVISION3D
Vinyl-based material from France. We did try a 7.5 x 10' screen from them, but it was very directional and the paint was somewhat uneven. Since then they claim to be using a robot arm for silver application. Their prices are reasonable, but again, no US distributor. All about 3D, but very difficult to get information (website is French only, but in English it would be very hard to understand).

SILVER LINING
This was a fabric developed by Studio 3D- unfortunately the company that manufactured it won't make any more. They are used to making many, many yards of material for upholstery and clothing... and this material is not easy to make! It was a silver liquid goo coated onto a stretchy lycra material. The 3D characteristics were quite good, and it was SO easy to put up, due to the elasticity of the material! Tended to resist marks as well. Perhaps someone will again find a company that will do this fabric "coating" on a relatively short run. (The other downside was a maximum 5' height~)

CARL'S SILVERSCREEN
Incredibly cheap, but we've not seen it! No reviews yet... we are awaiting a sample.


An alternate possibility is to PAINT a silver surface. We've tried KRYLON silver paint on a small piece of masonite which worked well, but may be hard to do evenly on a larger surface. A professional sprayer and Silver 3D Screen Goo may be a good option, but we've not seen it yet (have had one negative report). Not cheap at $250 a quart plus basecoat (plus hiring a sprayer!) Found another paint that's cheaper, 3D HD Silver ($189 quart) from Paint On Screen. Checked out a sample and it is REALLY bright! Great extinction, too.

PLEASE let us know if you have other sources for silver screens!

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