Originally Posted by jmatt
Thanks. I am still in the planning stages, about a month away from doing the finishing work. I ordered my spandex for the screen today as well as some led lights to see if I like a zero edge backlit spandex screen. Like the way it looks in the demo rooms, so i am anxious to see how it looks at home.
I want to maximize the screen in the space that I have. I'll post pictures as I go through the process.
I gotta clarify a few things.
First off, the amount of stretch available to the 80-20 Spandex is considerable, and easily enough to accommodate the 72"s required without it being overstretched. You would want to stretch it evenly though.
Secondly, you absolutely need to minimize your throw distance. For a 150" diagonal screen that is 1.0 gain, the minimum distance is 14' - 9" which grants you 18 foot lamberts. Move out 9" to 15' - 6" and you only drop to 16 fls....a good place to be for almost any normal content. But 3D? Better close off the room into total darkness 'cause your off-the-screen reflectivity will drop to 7-8 fls And all the above is based on a 1.0 gain surface. The Spandex combo will equate to being at most 0.85 gain.
(...there is a simple answer to that...
It's a cool idea in any design, Zero Edge-ing w/ Back lighting. But when using a porous material like Spandex...or really any perforated / Weave material, you have to be 100% assured you won't have rear light leakage,
You will need a totally "Light Blocking" material behind the Spandex. For the size screen you have, and the job that needs doing, you should acquire your "Black Out Cloth" here:
Use the Pull Down menus to select the 110" wide material. You will only need 3 yards if you settle on 72" x 128" (147") otherwise spend the $9.00 more and go out to 150" (74" x 131"} because the Spandex will take those 2 extra inches in stride.
I suspect you might want to build your Frame from selected 2x4. or in the least 1x4 Poplar rigidly braced.
But in all this lurks the inevitable question? Is Spandex the best choice here? Well chosen White Blackout cloth will perform as well as...even better than White Milliskin Spandex as far as Gain, and would only require "ONE" layer to do so. That same layer would have no potential of lighting up from the rear mounted LCD / LED Rope Lighting.
Nope...if your gonna back-light, and you gonna go big, I don't think a dual layer Spandex / BOC backing screen makes much sense.
Go with a good material of close to 1.0 gain to achieve the minimum results stated above. BOC comes close.....,
..................but you could take it much further, and do so much better if you painted onto the BOC surface. You do need the gain boost, and should it also come with improved Black levels......what's not to love at 150"?
BOC + RS-MaxxMudd LL
................it's where 150" needs to be.
I see you already ordered your Spandex. I'll trade you some RS-MaxxMudd for it. Game?