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140" Monitor Demonstration At Purdue

Posted by timothy on from the living-room-or-war-room dept.

michaelpapet.com writes "Edward J. Delp, a researcher at Purdue University is working with Philips to make a monster 140" monitor using 4 projectors on a single screen. Article claims it would be good for National Security... I dunno, I see this being the only way to satisfy 'big screen envy.'"

4 of 238 comments (clear)

  1. DPI by Apage43 · · Score: 5, Interesting

    Okay, it's a BIG projection screen, but, what kinda DPI does it get?
    I've seen these things that 'Make a big-screen dvd player', that are simply a lens you put over a portable dvd player's LCD screen, which doesn't have high enough DPI to account for such a big screen. is it extra blocky or is it at like 1200000x102400000 resolution? (And if so how many FPS can it get on... say, anything?

  2. Reverse engineering for dummies by LostCluster · · Score: 4, Interesting

    This particular display also includes a computer, which runs an algorithm that gets rid of overlapping regions between adjacent projections, eliminating the seams in the process.

    There you go. Take four projectors and let them overlap a little. Then, you pixel-row by row eliminate the overlaps by not moving the projectors, but simply feeding the projector black lines in the places where you don't want it to do any work. When you've assured that there's no point on the screen being served by two projectors, you've also lowered the seam area to less than the width of a pixel on the screen.

  3. Attention Slashdot Editors: by Anonymous Coward · · Score: 5, Interesting

    We, the loyal readers of Slashdot, know that there is a problem with Slashdot. Lately, we have been receiving tons of 503 and 500 errors (and "Nothing to see here", as well). Slashdot has also been extremely slow during this time on many occasions. We demand to know what is going on. What is wrong? What is being done to fix it? Or are you just going to bitchslap this thread and try to hide the problem (security through obscurity)? We aren't unreasonable; we just want to know the truth. I think we deserve it.

    Thank you.

  4. But does it self-align? by Animats · · Score: 4, Interesting
    The question is whether this self-aligns all the projectors. If it does, it's a step forward. If it doesn't, it's Yet Another Mosaic Display With Alignment Headaches.

    Self-alignment is quite feasible today, because you can get multi-megapixel cameras. Or you could aim a cheap webcam at each join point. Somehow you've got to get high-resolution images of the join points. Then alignment is a straightforward process, if you get to project test patterns.

    For a production product, it would make sense to put a cheap camera in each projector, looking at the screen. Doesn't even have to be color. Some CRT-based projectors have this now, for auto-convergence. Then you could just aim a few projectors at the screen, get them roughly aligned, and let the software do the setup. This could even work for LAN parties.