Ok 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.
Tiny volumetric display
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Re: Tiny volumetric display
#42This would look better with the LEDs on a transparent PCB, right?
I bet you could to it with those little fiber-optic wires. Not the fancy telecommunications ones, the cheap stuff they use to make decorations. I wonder how they respond to being dunked in epoxy.
LEDs connected directly by rigid wires (no PCB at all), then encased in resin might be worth considering too.
Re: Tiny volumetric display
#43This is a neat project. With such a low resolution, am I wrong in thinking that the flame simulation could be done in real time on-chip using a cellular automata algorithm? It would still be nice to support pre-rendered video for other purposes, of course.
Re: Tiny volumetric display
#44I’d prefer this kind of spatial computing, I like it more than AR/VR – especially that this relies more on human sensory input, as opposed to working against it. E.g. no need to simulate head tracking.
Re: Tiny volumetric display
#45Pretty cool, but the bigger the display, the more that refresh rate becomes an issue. Say you can refresh the outer pixels on the horizonal axis at 100 fps. Then if you want to have 50 pixels on the outer half circle, then you can change them at 2fps.
conventional leds can be driven at several megahertz pretty easily. the white type uses a yellow phosphor that fades slowly but they can still do kilohertz
Re: Tiny volumetric display
#46Creative. 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…
100%. And the "weird" (not weird -- useful!) thing that happens with time is that once you start writing down ideas (and you should definitely note pretty much all of them - regardless of how good/bad they seem), your mind gets into "having more ideas" mode... You sort of get a second wind - or more accurately, you start developing your "what if" muscle. And the stronger it gets, the more "what if"s you'll have. And some of those will 100% be really really good (whatever good means to you).
It's also ok to have really """bad""" ideas. They're always funny to read back (a month/year) later. They're fun to share with friends and strangers. And sometimes they lead to good ones as you think about what made you think the bad ones were bad in the first place.
Re: Tiny volumetric display
#47geohot built one of these in high school
https://www.forbes.com/forbes/2007/0723/060.html?sh=3c183bcb...
Re: Tiny volumetric display
#48geohot built one of these in high school https://www.forbes.com/forbes/2007/0723/060.html?sh=3c183bcb...
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Re: Tiny volumetric display
#49Earlier 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…
> 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
The edge of such a display would also be moving at several hundred miles per hour, which creates it own whole set of problems.
Re: Tiny volumetric display
#50This is so awesome.