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» Film-Tech Forum   » Operations   » Ground Level   » Screen bulging out?

   
Author Topic: Screen bulging out?
Thomas Pitt
Master Film Handler

Posts: 265
From: Leeds, West Yorkshire, UK
Registered: May 2007


 - posted 05-15-2010 01:37 AM      Profile for Thomas Pitt   Email Thomas Pitt   Send New Private Message       Edit/Delete Post 
I just went to see the remake of Nightmare on Elm Street, and noticed a patch of distortion on the screen; assumed it was a dent. After the movie, I took a closer look at the screen. It wasn't a dent, but a BULGE. The screen was actually bulging out (towards the seats) at that point!

I can understand the screen denting or tearing if people throw stuff at it, but what would cause the screen to bulge outwards like that?

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Michael Voiland
Expert Film Handler

Posts: 219
From: Naperville, IL US
Registered: Aug 2009


 - posted 05-15-2010 01:48 AM      Profile for Michael Voiland   Email Michael Voiland   Send New Private Message       Edit/Delete Post 
Did you take a peek behind the screen. Your speaker might have started to tip forward and well come off the stage behind the screen.

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Cameron Glendinning
Jedi Master Film Handler

Posts: 844
From: West Ryde, Sydney, NSW Australia
Registered: Dec 2005


 - posted 05-15-2010 02:01 AM      Profile for Cameron Glendinning   Email Cameron Glendinning   Send New Private Message       Edit/Delete Post 
I have seen speakers do this. I have also worked in a big IMAX that has a "belly" simply due to its huge size!

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Christopher Crouch
Expert Film Handler

Posts: 128
From: Holywood, ca, usa
Registered: May 2006


 - posted 05-15-2010 06:08 AM      Profile for Christopher Crouch   Email Christopher Crouch       Edit/Delete Post 
I would guess either a speaker or some item that they are storing fell forward into the screen. I've seen too many theatres that utilize the back screen area like a storeroom (ladders, left over construction materials, broken equipment, etc.).

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Ken McFall
Jedi Master Film Handler

Posts: 615
From: Haringey, London.
Registered: Apr 2001


 - posted 05-15-2010 06:11 AM      Profile for Ken McFall   Email Ken McFall   Send New Private Message       Edit/Delete Post 
Is it a curved screen frame?

If so it could be over tensioned and pulling the horizontal out of it's curve...

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Chris Slycord
Film God

Posts: 2986
From: 퍼항시, 경상푹도, South Korea
Registered: Mar 2007


 - posted 05-15-2010 11:26 AM      Profile for Chris Slycord   Email Chris Slycord   Send New Private Message       Edit/Delete Post 
This can especially happen bad on the dreaded Torus screens if the vacuum behind the screen stops working. You'll get pretty big sags.

Thankfully, I haven't dealt with those in quite a while.

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