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Comment by guerrilla | Hacker News Reader

Hmmm, it's tiny... but what about a bigger matrix of LEDs that can be moved around just a little bit. The idea I guess is time-multiplexing lights in space... So if you have a big board with a grid of LEDs and shake it around a bit, you can do the same thing but with less movement and more lights... You get more pixels for the same number of lights.

(Hopefully someone can visualize what I mean.)

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Better yet, move the matrix in the normal axis to put your pixels in 3D space.

https://www.google.com/search?q=swept+volume+display

For something less cutting edge, you can spin a bar with individual LEDs instead of a disk full of holes. Also makes for a good DIY project now that we have the microcontrollers to do it without specialized slip rings. But contrary to popular use, neither of these is a 'holographic display' as they don't use holography!

There are little toy fans with 8 or so leds on the blades that do this...show a word while the fan spins.

There used to be cheap LED wand displays you could wave in the air to display messages. Once popular with ravers.[1]

[1] http://www.houseofrave.com/skyliner_message_writer.html

Ans SUPER expensive ones that appear to make a 3D hologram in the air.

However, wouldnt it make sense to change the shape from a square to a wedge/arc that more accurately follows the arc of its orbit and resulting in a tighter pitch between scan line?

I worked for a company (2009-10) that made big spinny ones for outdoor advertising (they got a few deployed in the UK) and were working on a 8'x5' billboard-style one which had 8 huge rotors, each with 4 arms, coated in (of the time huge) LEDs.

When it span up, it sounded like a steam-powered 747 trying to take off.

Thankfully (because the potential for catastrophic disintegration was huge) the company went bust before any of these got deployed anywhere near the public.

check out the suspected new displays in the next oculus headset https://www.androidcentral.com/gaming/virtual-reality/quest-...

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