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avwerks
Joined: 14 Oct 2006
Posts: 16
Location: OC ,Calif.
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| Posted: Mon Mar 21, 2011 8:26 pm Post subject: RGB digital convergence processor for dila,dlp? |
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Been considering a JVC for sometime now and reading all the issues that people complain about there are solutions for various things(color, gamma, noise, etc.) but the one that hasn't a final solution is perfect single pixel grid alignment for the 3 panel machines. Just global bare bones alignment
Will we ever see a transparent seperate box to tackle this issue or is this to much to ask from digital video chips at present?
Lumagen? DVDO?
Regards
David
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Mon Mar 21, 2011 8:54 pm Post subject: |
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I will be surprised if you ever see that. The reason being, you are dealing with 3 essentially identical panels. The grid *should* be off uniformly. If it is not, adjustable by a global panel movment, then the panel is mounted incorrectly or the optics are mounted incorrectly.
To do what you said would require on of two things:
1 - it being done in the optics and even if doable would be VERY complex.
2 - PJ to have a larger number of pixels than they intend to display.
To do it in a Lumagen or DVDO on a per pixel basis would be live digital keystone. The only way you can "borrow" the pixel next to the one that need to be moved over is to throw out some of the image to create room. Consider this hypothetical 4 x 4 panel. X is the pixel you want to "move":
0 0 0 0
0 0 X 0
0 0 0 0
0 0 0 0
If the image is 4 x 4 and the panel is 4x4, you can't move "X" anywhere without getting rid of an "0". So, for a Lumagen or DVDO to do it, it would involve downscaling. I don't see this happening.
Secondly, just having a few extra pixels (say a 2100 x 1120 panel for a 1080p image) would not give you enough pixels for per pixel adjustment of fringing. You'd not really be much better off than the whole panel alignment that exists today.
_________________
Dave
A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station....
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avwerks
Joined: 14 Oct 2006
Posts: 16
Location: OC ,Calif.
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| Posted: Mon Mar 21, 2011 9:22 pm Post subject: |
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Your explanation makes sense. You just have to live with the best possible QC hoping it wasn,t assembled on a monday or friday! Having gone down to the JVC service dept close to me, he explained to me they replace the whole optical block assembly when out of spec. Theirs no mechanical adjustment according to them, but there should be, and somebody will probably accomplish this in time.
Unfortunately their out of spec is a compromise you can see clearly and easily fixed in the analog CRT world.
Regards
David
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Mon Mar 21, 2011 9:47 pm Post subject: |
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| avwerks wrote: | Unfortunately their out of spec is a compromise you can see clearly and easily fixed in the analog CRT world.
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Yes, my CRT experience made me a bit of a "convergence" nut. Mine were always perfect, I checked it like every 4 movies!!!! I was terrified of 3 chip designs as they won't fix or replace a half pixel misalignment which I can see from my preferred image seat. So, despite seeing some rainbows I went with a single chip DLP with very good optics (they can only have color fringing from the optics).
Interestingly enough, I found several things since doing this (about single chip DLPs):
1) I don't see rainbows hardly at all on newer (greater than 4x color wheel) DLPs than I did the older.
2) I ended up seeing many less rainbows within 6 months of getting the DLP than when I first got it.
3) I see fewer rainbows when watching at a multiple of 24 (48 or 72) than I do watching at 60. At 48, I literally have to try to see them as I almost never see them normally.
4) I have come to really love high ANSI CR on bright scenes (after railing against its importance relative to high on/off CR for years).
I have to come clean though as I lightened up a bit on the color fringing. When I looked at anamorphic lenses, it was either spend a little and live with almost 1/2 pixel of blue fringing only at the very edges, or spend over $3000 to get no fringing. Well, I'm too cheap for the $3000 lens, so I lieve with just under 1/2 pixel of blue at the very edges (which no one really notices).
YMMV.
_________________
Dave
A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station....
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avwerks
Joined: 14 Oct 2006
Posts: 16
Location: OC ,Calif.
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| Posted: Sun Apr 24, 2011 2:00 pm Post subject: |
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Looks like this is possible outside full mechanical panel alignment only. In the new widescreen review of the vw90 Sony it mentions solid single pixel alignment within the video signal and seperate of color.
So this is possible to have a black box to take care of this issue for the 3 chippers
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