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daves123
Joined: 16 Jan 2009
Posts: 126
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| Posted: Thu Aug 06, 2009 10:49 pm Post subject: More red on the right side & blue on the left side of sc |
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I see more red on the right of my screen and blue on the left. Is this normal with crt projectors because of the placement of the tubes?
Last edited by daves123 on Fri Aug 07, 2009 9:35 am; edited 1 time in total
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Thu Aug 06, 2009 11:22 pm Post subject: |
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I don't think this is normal, even if it does happen due to tube placement I doubt it would be obvious. On my G70 I can correct for this in the uniformity menu.
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Thu Aug 06, 2009 11:26 pm Post subject: |
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On higher gain screens it'll be more noticeable. Think of it like this: a 1.0 gain screen is completely matte, and you'll see no hotspotting. A mirror is very, very high gain, with very very bad hotspotting! And the hotspot for each tube is in a slightly different place - obviously; you're looking at the reflection of the PJ.
Well, you're ALWAYS looking at the 'reflection' of the light the PJ is throwing. The degree and 'spot tightness' of hotspotting is determined by the gain and shine of the screen, and the hotspot for each tube is obviously in a different position. So, it all manifests as color shift. Color shift and hotspotting are two sides of the same coin.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Aug 07, 2009 1:19 am Post subject: |
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Throw a white cotton cloth over the screen surface. If the problem goes away, you have a high gain/wrong screen material installed.
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greg_mitch
Joined: 03 May 2006
Posts: 5320
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| Posted: Fri Aug 07, 2009 2:12 am Post subject: |
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If ronholm had this problem his head would explode!
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Fri Aug 07, 2009 2:21 am Post subject: |
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| greg_mitch wrote: | | If ronholm had this problem his head would explode! |
 
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bbfarmht
Joined: 27 May 2006
Posts: 1273
Location: Where the Mississippi runs east to west!!
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| Posted: Fri Aug 07, 2009 2:26 am Post subject: |
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_________________
Adam
"Any society that would give up a little liberty to gain a little security will deserve neither and lose both"
Benjamin Franklin
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Fri Aug 07, 2009 3:51 am Post subject: |
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this is not normal, your using the wrong screen.
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Fri Aug 07, 2009 8:15 am Post subject: |
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If by chance its not the screen then I could be real. Contrast modulation is designed to deal with just this phenomenon. Is the image your looking at also brighter in the middle??
Its probably the screen though.
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daves123
Joined: 16 Jan 2009
Posts: 126
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| Posted: Fri Aug 07, 2009 9:39 am Post subject: |
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It was apparent on my clarion shadowbox m1300 screen. I've since switched screens to 1.0 gain screen and I still see it. I'll try the sheet thing tonight, and see what I see. The image isn't really brighter in the middle, just not as red, or blue.
What is this contrast modulation?
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TheVerge
Joined: 19 Jul 2009
Posts: 928
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| Posted: Fri Aug 07, 2009 3:28 pm Post subject: |
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| daves123 wrote: | It was apparent on my clarion shadowbox m1300 screen. I've since switched screens to 1.0 gain screen and I still see it. I'll try the sheet thing tonight, and see what I see. The image isn't really brighter in the middle, just not as red, or blue.
What is this contrast modulation? |
Don't feel bad, i have the same problem, and it's definitely not from too high of gain on the screen. Been to busy to mess around and try to fix it.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Fri Aug 07, 2009 3:47 pm Post subject: |
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| daves123 wrote: | It was apparent on my clarion shadowbox m1300 screen. I've since switched screens to 1.0 gain screen and I still see it. I'll try the sheet thing tonight, and see what I see. The image isn't really brighter in the middle, just not as red, or blue.
What is this contrast modulation? |
Contrast modulation allows you to actually adjust contrast (light output) in different zones on the tubes. It's standard on a MArquee and a few other models, but optional or just not available on most sets especially the 7 inch ES focus I think? What projector are you running?
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daves123
Joined: 16 Jan 2009
Posts: 126
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| Posted: Fri Aug 07, 2009 4:54 pm Post subject: |
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Yeah, this is just a bedroom 7" es ecp. I can live with it, just thought maybe there was something I hadn't done right when I set it up.
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