Superimposing LCD image on CRT - AVS Forum
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post #1 of 9 Old 09-05-2004, 07:11 AM - Thread Starter
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I did this accident - I'm trying out a video grade CRT (Sony VPH-1001) and I've already got an LCD (Panasonic PT AE500).

I've got bot hooked up - LCD with line doubler and CRT with S-Video.

(The CRT won't accept progressive scanned signals, but the LCD has decent specs).

Anyway, as I was switching between projectors for comaprison, they were both on a a while and it seemed like an idea to try superimposing. Took a bit of doing (mainly with moving the LCD, of course) - but the results, I must say were pretty amazing.

I'm going to play this a bit - I think what may be happening is that the LCD pixel gaps are being "filled in" by the CRT and there is phenomenal sharpness and detail. Tonight I shall be looking closely at what's happening to the colors.

Has anyone tried this? Or can someone give the technicals on this?

thanks
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post #2 of 9 Old 09-05-2004, 08:50 AM
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Hi ahmedhaff,
Funny you started this thread - I was looking at this kind of thing yesterday.
Here is an interesting link that is relatively relevant to this topic:
http://www.cs.ubc.ca/~heidrich/Projects/HDRDisplay/
Vic
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post #3 of 9 Old 09-05-2004, 09:37 AM - Thread Starter
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Thanks for the link, mcpherv - very interesting.

I've been tweaking for the past few hours - this is incredible stuff! I am sure someone has to have tried it before.

I've had the LCD for over a year now and just recently started looking at getting a CRT - idea always was to retain the LCD as well (from the same sources) for plug and play use, as well as watching TV (these days every channel has a perpetual logo, ready to burn in!).

Will keep you posted after more playing around!
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post #4 of 9 Old 09-05-2004, 10:41 AM
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Excellent, let us know your results. The one problem I can see, though, is that remember that you will lose the deep blacks the crt affords you when superimposing the lcd. However, I can imagine it looks a lot better on the lighter scenes.
Vic
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post #5 of 9 Old 09-05-2004, 10:48 AM - Thread Starter
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There is a bit of a compromise on the blacks (judging by the horizontal bars, courtesy 1:2.35), but not as much as you would expect. Sort of like a CRT image with a bit of ambient light in the room.
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post #6 of 9 Old 09-05-2004, 05:15 PM
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Figure out how to get the smoothness and black levels of a CRT, combined with the punchiness and sharpness of a digital and you will be a wealthy man...

There's no place I can be, since I found Serenity. You can't take the sky from me.
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post #7 of 9 Old 09-05-2004, 09:02 PM
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after running a HS10 and a sony 1251 and now a hs10 and a nec PG9, I cant see the benefit of shooting over the top of each other, theres just no comparison?

I basically use the LCD for data and the boos to watch australian idol, and my CRT for everything else.

I must admit it takes half an hour to think the image is bright on the crt after watching the lcd for a while, but its in my view gaining nothing putting the two over the top?

It crushes the image to do this, simply in my view magnifying the weakness's of the LCD unit. its just like watching the CRT and then turning the brightness to full and the contrast to minimum.
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post #8 of 9 Old 09-05-2004, 09:24 PM
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Still, the idea of a digital/crt stack is an interesting one, especially on a digital that has a dimmer 'cinema' mode.

DON'T feed the troll.
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post #9 of 9 Old 09-05-2004, 09:50 PM
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I guess maybe if you imposed over a DLP image which allready has fairly good black level. Maybe it would cancel out the rainbow effect.
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