This is tight. Presently working on a list of uses. Need one the size of a 5gal bucket. As it is, I'd stick one on my gimcrack cabinet.
https://youtu.be/CCuybyAO8fs?si=xBLYy5zKEEcloqeA
It's so smooth!
Tiny volumetric display
61–70 of 180 posts
Re: Tiny volumetric display
#62Creative. I probably have the persistence and interest to pull something like this off, but I lack the fantasy to come up with such cool projects. Luckily there's the internet to see what impressive stuff people come up with.
Creativity can be trained just like any other skills! :) I second taking note of stuff; like most things, genuinely practicing means you will get better. Something that's also overlooked often is (1) Technical knowledge, (2) Methodical invention (3) Motivation!. Technical knowledge helps you know which projects are possible (or just economically feasible), and map the roadblocks on the way; impossible inventions are…
I forgot to add: it's unlikely anything you come up with (while trying to develop your creativity) is going to be legitimately useful or even fun. It's like expecting to play a violin like Hillary Hahn (or ) after you've just picked it up. But the time to play an instrument so that at least you can tolerate your own sounds and have fun is much shorter -- and frankly, necessary I think not to give up before you can play really well (if that matters at all).
Re: Tiny volumetric display
#63One of those brilliant ideas that seems obvious in retrospect. Given that the results are so compelling even when pulled together by hand out of relatively primitive discrete components, I’m wondering why we shouldn’t expect to see full color, high resolution versions from every random 7-letter drop shipper on Amazon next Christmas?
It's not a new idea -- they're called swept-volume volumetric displays, and they've been around for a long time [1]. But they're mostly kind of just toys. When you're limited to transparent glowing surfaces and you can't even touch them, there's really not a whole ton you can do. You can see a much larger non-spinning version made of LEDs suspended on cables [2] and it's very cool, but the novelty kind of wears off a…
For [2] it does not look swept. Appears static.
Re: Tiny volumetric display
#64Creative. I probably have the persistence and interest to pull something like this off, but I lack the fantasy to come up with such cool projects. Luckily there's the internet to see what impressive stuff people come up with.
Tom 7 mentioned a thing in one of his videos, which is to keep a list, and write down every idea when you think of it, regardless of how stupid it is. Winnowing is for later. That way, when you have the energy to work on a project, you don’t have to waste it on coming up with an idea. It really makes a huge difference in what you can get done with side projects. You probably have more interesting ideas than you think…
But when you write it down - please include more than two or three words - because it's hillarious to come back to a list when a lot of time has past to see an idea written simply as 'The pope of physics' <- from my own list. I have no idea what I was thinking...
Re: Tiny volumetric display
#65Earlier quoted context omitted.
There's gotta be some way to replace the rack-of-leds-spinner with something lighter. Mirrors? Acrylic light pipe matrix?
I wonder if it would be simpler to just spin two phone screens glued back-to-back. You get higher resolution in about the same weight. Bandwidth would be a problem though.
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Re: Tiny volumetric display
#66Ok I just went down the rabbit hole of this guys projects over the last decade and I am now thoroughly impressed and utterly depressed that I'll never have as much free time as he does.
Free time is an excuse for most people - I'm not calling you out because I don't know you but most people spend a lot of time on YouTube - Hn - Watching TV etc and they could be working on a cool project instead.
Re: Tiny volumetric display
#67Earlier quoted context omitted.
Yeah, well, that's not going to work. Interesting problem all the same. For a 1 meter diameter and height cylinder at 60Hz voxel refresh and say 1mm resolution at the edge one would need the plane rotating at obviously 3600 rpm, and edge pixels switching at about 380KHz. Since rgb is nice to have that's 10 gigabit for a somewhat coarse display. Nothing impossible, but not a DIY territory yet. I think one'd want the L…
Note that in your hypothetical 1m 60Hz display, the edge of the cylinder is moving at 422 miles per hour. I'm going to recommend an evacuated transparent bell jar for safety, at a minimum...
Of course it has to be evacuated and maybe filled with helium or something less viscous than air at low pressure; this has to be calculated wrt the heat rejection from the leds. Also centrifugal force shearing and tearing off components, imagine the fun.
All in all, this is what makes it interesting, no? 1x1 meter holo tank, not those tiny Voxon shakers.
Re: Tiny volumetric display
#68Ok I just went down the rabbit hole of this guys projects over the last decade and I am now thoroughly impressed and utterly depressed that I'll never have as much free time as he does.
Free time is an excuse for most people - I'm not calling you out because I don't know you but most people spend a lot of time on YouTube - Hn - Watching TV etc and they could be working on a cool project instead.
Watching TV? YouTube? Sounds like your peer group is biasing you. How about struggling to work from home for 8 hours a day with two kids with zero familial support, an endless array of bills, and every possible life obstacle coming your way 24/7?
Re: Tiny volumetric display
#69Earlier quoted context omitted.
https://youtu.be/CCuybyAO8fs?si=xBLYy5zKEEcloqeA
Wow this one is cool. First time I've seen it. Reciprocating screen? How the hell do they get it to move that quickly? That is very high energy. Edit found another video showing it starting up https://www.youtube.com/watch?v=SMz4bJA47Js Now that I think about it, I suppose if you match the resonate frequency of the display component and its carrier it should be fairly efficient. Really cool stuff.
Other videos say that the bubble is just to protect the screen because (unsurprisingly, I would) people try to touch it - so it's not evacuated; doesn't that mean it's going to be a fairly loud 30hz speaker, effectively? (or is it just not well coupled because "speakers need to actually be designed" and it's not that bad in practice?)
Re: Tiny volumetric display
#70Earlier quoted context omitted.
The fundamental problem is refresh rate. If you have two phones that refresh at 240Hz (the fastest I know of), and you want your frame rate to be 12 Hz, you’ll still only be getting 20 refreshes per 180 degree rotation. So your angular resolution will only be 9 degrees. Assuming you use portrait mode, that will make your outermost voxels ~5 mm arcs. And even there, 12 Hz is probably pushing it in terms of flicker.
Yeah, well, that's not going to work. Interesting problem all the same. For a 1 meter diameter and height cylinder at 60Hz voxel refresh and say 1mm resolution at the edge one would need the plane rotating at obviously 3600 rpm, and edge pixels switching at about 380KHz. Since rgb is nice to have that's 10 gigabit for a somewhat coarse display. Nothing impossible, but not a DIY territory yet. I think one'd want the L…
I wonder if anyone has built multi-speed “layered” swept volumetric displays. For the center part, you would still just have one screen, but as you go further out, you’d have “spokes”, so that each screen only has to sweep a small angle (and roughly constant distance) during a frame, so that it rotates at lower RPM, and has to update fewer times.
You would still need a bare minimum of 1-2 kHz, and a lot of screens, and balancing every layer would be super difficult, but I don’t think anything about it is fundamentally impossible with current technology.