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TOPIC: Screen Type

Screen Type 02 Dec 2003 13:10 #21906

  • RealButter
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Hi,

I run a single screen, non-profit art house and I'm trying to figure out what kind of screen we have.

The only distinguishing characteristic is that it has small holes in it.

I'd like to find out what it is so we can clean it appropriately.

Thanks.
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Re: Screen Type 02 Dec 2003 13:34 #21907

  • John Pytlak
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Screens for motion-picture theatres are perforated, so the speakers can be located behind the screen for proper "placement" of the sound.

Is anything written anywhere on the back of the screen, especially around the perimeter?

A quick way to evaluate the "gain" of an installed screen is to project "open gate" white light on the screen, and hold up a sheet of matte white copy paper with a "Brightness" rating of 90 to 100. If you have a screen luminance meter, measure the reflected light of the screen, and of the paper "straight-on" along the primary audience site line. The ratio is approximately the "gain" of the screen. For example, if the screen measures 16 footlamberts, and the paper measures 12 footlamberts, the gain is 16/12 = 1.3, which would be typical of a pearlescent type gain screen. If you don't have a meter, just compare the brightness of the screen vs. the paper. A matte surface screen will be similar to the paper, regardless of the viewing angle. A gain screen will look brighter "head on", and less bright when viewed from an angle.

The reflective surface of a gain screen is quite delicate, and it is very difficult to clean it without seeing a difference in the area cleaned.

If the screen is notably colored (e.g, yellow) compared to the white paper, it should be replaced.

John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Cell: +1 585-781-4036 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
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Re: Screen Type 02 Jun 2004 12:47 #21908

  • RealButter
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Getting back to this...

We can't get behind our screen to check for a name. We do know it's not pearlescent and appears to be matte.

It's not yellow, just dusty. Is it ok to dust a screen?

Thanks for the guidance.

Sandra
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Re: Screen Type 02 Jun 2004 13:34 #21909

  • outaframe
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Sure, you can dust off the surface... Regular screen brushes are made, but you can also use a NEW clean soft push broom, just as well... One thing to be careful about is to not have any moisture on the screen surface, or the broom as that will cause a smear... Starting at the top, brush downward in complete passes to the bottom, IF possible... You can also carefully vacuum the screen with a wide CLEAN vacuum cleaner attachment... Vacuuming will also clean out the sound perforations (holes) you mentioned, which is a good idea...
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Re: Screen Type 02 Jun 2004 13:35 #21910

  • John Pytlak
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Yes, it is okay to "dust" a screen surface with a soft feather or fluff duster. Just be sure not to scuff it, especially if it has a "gain" surface. It's also a good idea to vacuum out any dirt from the sound perforations (from the backside of the screen of course). Using vacuum cleaner brush on the front can be very effective, but does risk scuffing.

John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Cell: +1 585-781-4036 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
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Re: Screen Type 02 Jun 2004 20:57 #21911

  • RealButter
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Great, thank you both for the information.

best,
Sandra
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