Dual DLA-SX21 setup? - AVS Forum
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post #1 of 7 Old 09-29-2002, 05:20 PM - Thread Starter
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Theoretically we can get 2100x1400 when we have two DLA-SX21 flipped sideways. The results can be similar to this one:
http://brighton.ncsa.uiuc.edu/~prajl...l/8x5pics.html

Did anyone try to put 2 or more projectors side by side? We certainly need some keystone correction that can join the splitted pictures together. Thanks.

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post #2 of 7 Old 10-01-2002, 02:13 AM
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'lo :) Nice idea - there's been some discussions this year - especially in the CRT projectors forum, about both "stacking" two projectors to get one brighter image the same size, as well as two side-by-side projectors to generate a wider image - Typically with the projectors the "Normal" was around, not on their sides.

There are tricks for certain high-end CRT projectors to help get the edges of each picture to blend together seamlessly, and with the same colour balance/white point etc etc... These could be harder to recreate on "Mainstream" digital projectors where "White" depends on lamp life etc.... However a digital projector wouldn't suffer from convergence drift which is the main headache in the CRT solution.

I've just returned from Photokina in Cologne - a high end camera & display show - where JVC were demonstrating 3 of their ILA projectors (model 4000s I think) producing a perfectly crisp and bright ultra-wide image... Each projector had a special attachment over the lens which must have been assisting the blending - but the result was an excellent image free of "joints"

....They also had their QX1 top-end projector shining onto a 6m wide screen, proving without a doubt that money CAN buy a *perfect* image if you have enough of it - and from only one projector....

.....saving for my upgrade to Hidef Digital in Christmas 2002
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post #3 of 7 Old 10-02-2002, 07:03 PM
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Hi bbq - I think that the price would still be shy of the $20K cut-off for this forum :D.

I don't see why this couldn't work. In fact, I believe that this projector could do accurate "blending", as you could fade out the pixels along the over-lapping edge so that they merge together nicely.

Any idea how you would feed a source, though? I think that would be the difficult part...

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post #4 of 7 Old 10-03-2002, 06:02 AM
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I'm considering tackling the image generation part -- at least for HDTV. I believe I can mod a PC-based HDTV card to produce two half-images with a programmable blend at the edge...

-Jon
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post #5 of 7 Old 10-03-2002, 06:08 AM - Thread Starter
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You may consider four SX5500W because VMR-9 can support up to four displays:

http://www.avsforum.com/avs-vb/showt...15#post1290415

http://www.avsforum.com/avs-vb/showt...68#post1333468

Just take a look at my "evil" post and you should know how to go beyond $20K:

http://www.avsforum.com/avs-vb/showthread.php?postid=1315666#post1315666

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post #6 of 7 Old 10-06-2002, 11:05 AM
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bbq - Wow...that IS an evil post...I don't even think I've ever noticed the post IDs before...

:D

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post #7 of 7 Old 10-06-2002, 11:30 AM
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The biggest problem could be the overlapping light spill at the joint, making a light vertical band of haze in the middle.

I don't see why keystone correction would be necessary, unless you wanted the projectors right next to each other in the center.

For that matter, how about 3 NEC HT1000's on their sides for 2304x1024, and that way there's no joint in the middle.

Noah
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