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Tiny volumetric display

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Re: Tiny volumetric display

#171

Post by orbital-decay »

late2part wrote: post #107
orbital-decay wrote: post #100

Make an acrylic cube or a sphere, put inside a projection surface that's able to rotate around one axis. Pump the air out for it to be silent and to be able to use a really thin sheet. Spin it with an external magnetic field. Project the distortion-corrected and spin-synchronized image to it with 2-3 projectors under different angles. Bang, you have your own Star Wars display that's entirely doable by a hobbyist.

Cool! Can you do this and write up the steps like the article?

Not me, but someone did that.

https://www.youtube.com/watch?v=VTe0p5BMEBM

https://www.youtube.com/watch?v=9dWt7pVx9i8

Re: Tiny volumetric display

#173

Post by pyinstallwoes »

krenzo wrote: post #149
pyinstallwoes wrote: post #140

Earlier quoted context omitted.

You seem to know a lot about this. Have you worked on similar things?

I work on VR/AR headsets where there's a drive for higher refresh rate displays to do things like multiple focal planes with the extra frames.

What do you think is on the horizon of cool or interesting within your work?

Re: Tiny volumetric display

#174

Post by fennecbutt »

Toorkit wrote: post #170
intrasight wrote: post #164

Earlier quoted context omitted.

I assume you mean business partner and not romantic partner. My romantic partner gives me great energy but would be like "Why are you playing with that soldering iron and not with me?" But yes, a good business partner (or two) is, for me anyway, a requirement to move something from idea to reality.

Then play with your romantic partner first, 2 minutes later you can work on the project together :^)

Gottem

Re: Tiny volumetric display

#175

Post by intrasight »

Toorkit wrote: post #170
intrasight wrote: post #164

Earlier quoted context omitted.

I assume you mean business partner and not romantic partner. My romantic partner gives me great energy but would be like "Why are you playing with that soldering iron and not with me?" But yes, a good business partner (or two) is, for me anyway, a requirement to move something from idea to reality.

Then play with your romantic partner first, 2 minutes later you can work on the project together :^)

One hour on average - sometimes two ;)

Re: Tiny volumetric display

#176

Post by krenzo »

pyinstallwoes wrote: post #173
krenzo wrote: post #149

Earlier quoted context omitted.

I work on VR/AR headsets where there's a drive for higher refresh rate displays to do things like multiple focal planes with the extra frames.

What do you think is on the horizon of cool or interesting within your work?

The big push is currently towards microLED displays because of the high brightness and fast modulation speed. Yield is not yet good, and there's difficulty in growing all colors on the same substrate. Picking and placing different color LEDs onto the same panel is not cost effective. Red microLEDs are also not yet as bright as blue and green.

There was a push towards micro liquid crystal panels with laser illumination to create holographic images with depth. There are several startups still pursuing that, but the image quality isn't very good at the moment.

The latest advancement has been in the optics with moving to pancake lenses to reduce the length of the optical path from the display to the eye. The Meta Quest 3 has a smaller form factor than previous generations because of this.

Re: Tiny volumetric display

#178

Post by butlike »

noduerme wrote: post #83
crazygringo wrote: post #20

Earlier quoted context omitted.

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…

The killer app is clearly sending messages via R2-D2.

"You have an incoming message request from: SALES TEAM" "Help me, dev team, you're my only hope."

Re: Tiny volumetric display

#179

Post by HeyLaughingBoy »

weinzierl wrote: post #145

"Small circuit boards from China are essentially free[..]" A little later: "Some time ago, I got access to a pick and place machine (a Charmhigh CHM-T36VA). I have it on semi-permanent loan." Why is it, that it still makes sense to assemble boards yourself while outsourcing PCBs is a no-brainer? It doesn't have to be "essentially free" , but isn't there an assembly service that is suitable for hobby projects like thi…

Making PCBs can be "essentially free" because the manufacturer can group multiple orders on the same panel so they reduce manual workload and increase throughput.

The PCB manufacturers typically also offer assembly services, but individual assembly orders require individual sets of components. So you either need parts feeders with a huge variety of components (read: expensive) or you need to intelligently group the orders that use the same set of parts. And for minimum cost, you'd need to group the orders that used similar parts onto the same panel so they could all go through the P&P at the same time.

I suspect that it's feasible, but there's not enough cost pressure on assembling PCBs for the manufacturers to bother going down that road.

Re: Tiny volumetric display

#180

Post by K0balt »

throwawayben wrote: post #102
buildbot wrote: post #36

Earlier quoted context omitted.

Don’t oled displays support pretty high refresh rates? And also have way lower GtG latency?

with this kind of spinning display you'd need to multiply the frame rate you want by the angular resolution you want. So if you're happy with only 20 different angular views and only a 20fps refresh rate of the 3d display then that's 400fps required of the flat display

Oof. I think that might tax the typical driver ASICS that are used on those.
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