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ElTopo
Joined: 07 Nov 2006
Posts: 1640
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| Posted: Sat May 03, 2014 5:10 pm Post subject: Curved screen for CRT |
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Saw a curved flatscreen tv today in 4K and it looked awesome.
Imagine a screen in a batcave with a high end crt 
Are the HFQ904 really needed for a curved screen like the stewart cine-w or could it be done with the HFQ900 ?
http://stewartfilmscreen.com/commercial/products/fixed_screens/cine_w/main_image.jpg
cheers
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jbmeyer13
Joined: 03 Dec 2010
Posts: 1135
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| Posted: Sun May 04, 2014 3:24 am Post subject: Re: Curved screen for CRT |
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The idea of a torus screen is very intriguing. If i didn't have a automated masking screen this is what i would do. You could probably build it > 120" diagonal and be fine with light output. I wonder just how big you could go with a sole projector. They are not easy to build or maintain but offer insane gain without hotspotting.
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tschaeikaei
Joined: 08 Apr 2013
Posts: 490
Location: Germany/Saarland
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| Posted: Sun May 04, 2014 1:20 pm Post subject: |
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I'm about to choose between torus and curved, too.
The torus may have even better uniformity than the curved and you could use even higher reflecting screen fabric.
But its more difficult to build and you need something like a fan to suck the air out of it while you are watching.
The fan idea kind of does not please me. Is there any other solution to this, e.g. a coating that stiffs the cloth after building?
Anyone did torus and blend together? May be two complicated things combined, i am not sure if it is possible to build
with a low budged like mine.
For the lens question: I think it depends on how deep the curve is. May work with a not too deep curved screen,
but why not simply try it?
Just mount some spacers in the corners of your existent and set up screen and try if you can focus them with the outer focus of the HFQ900.
Regards, Julian
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Spanky Ham
Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central
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| Posted: Sun May 04, 2014 3:31 pm Post subject: |
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Torus will give you the best uniformity. There have been several people who have built them and say it isn't that hard. If I were going to ceiling mount my pj, then I would have considered a Torus. Since, I am floor mounting I will probably get a high power.
If you want to build a Torus, then look for a thread by Iceman over at AVS.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sun May 04, 2014 5:19 pm Post subject: |
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Hmmm
Torus or curved will sacrifice prime seating possibilities for light output. Blending gives obscene light output, making torus/curved screen unnecessary 
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tschaeikaei
Joined: 08 Apr 2013
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Location: Germany/Saarland
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| Posted: Sun May 04, 2014 9:01 pm Post subject: |
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Hi Tim, i should mention that i want to use shutter 3D on that setup. So every amount of light is welcome.
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Nashou66
Joined: 12 Jan 2007
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ElTopo
Joined: 07 Nov 2006
Posts: 1640
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| Posted: Mon May 05, 2014 4:09 pm Post subject: |
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The question is how big you can go with one single projector ?
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Spanky Ham
Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central
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| Posted: Tue May 06, 2014 3:32 pm Post subject: |
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As big as you want
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tschaeikaei
Joined: 08 Apr 2013
Posts: 490
Location: Germany/Saarland
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| Posted: Tue May 06, 2014 4:16 pm Post subject: |
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My desired setup is a blend of 2 Marquee 8500 AC Ultra using HD8 Rev.B or (if i get them) two sets of HD144.
The screen would be 3,1m (10.2 ft) wide and 16/9.
Yes, this will be plenty of light, BUT: the main thing is that i want to go 3D.
If it's good, the viewers eyes will catch about 35-40% of the light.
So i want as much light as possible.
The curvature is limited to a maximum of 22cm (8.7").
I tried this with the HD8 and bad set up astig (have to get 4 or 6 pole magnets...)
and the depth of those 22cm from edge to center works, meaning the lenses focus.
Regards, Julian
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Spanky Ham
Joined: 22 Mar 2006
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Location: Comedy Central
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| Posted: Wed May 07, 2014 2:28 am Post subject: |
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All I will say is good luck. I don't think even Craig would try to tackle something like a Torus blend. 
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RaWsHaRk
Joined: 01 May 2009
Posts: 131
Location: Finland
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| Posted: Fri May 09, 2014 12:34 pm Post subject: |
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| tschaeikaei wrote: | My desired setup is a blend of 2 Marquee 8500 AC Ultra using HD8 Rev.B or (if i get them) two sets of HD144.
The screen would be 3,1m (10.2 ft) wide and 16/9.
Yes, this will be plenty of light, BUT: the main thing is that i want to go 3D.
If it's good, the viewers eyes will catch about 35-40% of the light.
So i want as much light as possible.
The curvature is limited to a maximum of 22cm (8.7").
I tried this with the HD8 and bad set up astig (have to get 4 or 6 pole magnets...)
and the depth of those 22cm from edge to center works, meaning the lenses focus.
Regards, Julian |
I dont think you can do that (3d torus blend) but good luck with the project and keep us updated
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Tim in Phoenix
Joined: 21 Oct 2006
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Location: Phoenix
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| Posted: Fri May 09, 2014 1:45 pm Post subject: |
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Guys
You will want a flat screen for blending, so the two projectors do not need to occupy the same space
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Fri May 09, 2014 4:01 pm Post subject: |
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What was the 4K Curved TV You saw? Last curved display I ever saw was made by Ostendo (the CRV43). It wasn't anywhere near 4K but it was 29" and curved, 3 of them made a 180 degree half circle.
Sorry for the OT post
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
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Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Fri May 09, 2014 4:35 pm Post subject: |
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| Tim in Phoenix wrote: | Guys
You will want a flat screen for blending, so the two projectors do not need to occupy the same space |
I don't see how the subtle curve of a torus or cylindrical screen would force the projectors that much closer together. We're probably talking a foot or so closer when they're usually what, 3-4 feet apart?
Now, whether it will help getting geometry or blend zone better or make matters worse… That's a discussion.
SC
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ElTopo
Joined: 07 Nov 2006
Posts: 1640
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| Posted: Fri May 09, 2014 7:08 pm Post subject: |
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4K curved was a LG and Samsung.
4K on a flat Sonly looked also stunning. 3D effect is superb without using 3D glasses.
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the big E
Joined: 20 Apr 2013
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Location: speedwell Tn.
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| Posted: Mon May 19, 2014 5:39 am Post subject: |
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I have also noticed the curved Sammy tvs they do look nice but the viewing angle would be kinda limited
Really don't have a need to upgrade my tv anyway plus most digital tvs are a downgrade when you play games due to input lag
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hansilili
Joined: 09 Mar 2007
Posts: 302
Location: Köln, Germany
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| Posted: Thu May 22, 2014 7:40 am Post subject: |
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| tschaeikaei wrote: | My desired setup is a blend of 2 Marquee 8500 AC Ultra using HD8 Rev.B or (if i get them) two sets of HD144.
The screen would be 3,1m (10.2 ft) wide and 16/9.
Yes, this will be plenty of light, BUT: the main thing is that i want to go 3D.
If it's good, the viewers eyes will catch about 35-40% of the light.
So i want as much light as possible.
The curvature is limited to a maximum of 22cm (8.7").
I tried this with the HD8 and bad set up astig (have to get 4 or 6 pole magnets...)
and the depth of those 22cm from edge to center works, meaning the lenses focus.
Regards, Julian |
With a curved or torus screen setup you sacrifice uniforn optical focus. With a single projector this can be minimised below visibility in film viewing. On a pure grey picture you wil see minor colour variations due to uneven focus and chromatic abbreation and computer desktops won't be razor sharp on the edges. Both is neglectable in film viewing, at least I personally can accept this.
In a blend or stack setup this gets worse. You still can live with the optical focus issue in regard of detail resolution. But the colour will be even less uniform.
So, if you want more light then build a stack. I did and was amazed by the punch of the picture. Still ist was not practical for daily use, the space, the noise, reduced resolution due to poor convergence...(forget about electrical power). I rather live with the dim picture of a single 10PG and have a spare machine sitting in the corner.
If I were you I'd get a single 9 inch projector and forget 3d. I you want to try 3D then get a budget digital for that.
Cheers
from an ex Dillinger
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