h a l f b a k e r yWe got your practicality ... right here.
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Who hasn't seen Persistence Of Vision (POV) displays?
One problem with them is that each of the LEDs is a fixed
distance from the center of rotation, and, in between each
LED and the next is a dark region, which appears as a dark
circle when the POV display is in operation.
What if the center
of the spinning disk (or spinning stick)
was making an additional orbital motion, similar to the
movement of a random orbital sander?
This would result in each LED continuously changing its
distance from the actual center, and ensure that every part
of the display got illuminated, with no dark regions.
[link]
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How about two counter-rotating wotsits of LEDs, synchronised Chinook-fashion so as not to bump into each other, mounted at both ends of a shorter wotsit which is itself rotated around its central point? |
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Just stagger the LEDs so there's overlap, and trigger the trailing ones behind the leading ones. No gaps. |
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I was wondering about something. |
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If you strip down a flat-screen LCD display, you should end up with a more-or-less transparent display, with no backlighting. |
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Now mount this on a motor so that the whole thing spins around its long axis. Either feed the signal in through a commutator, or have the electronics spinning with the screen and comminicate Bluetoothwise. |
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You should now have a cylindrical display volume of very high resolution, as long as you can sync the signal to the rotation. |
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[edit] OK, a quick Google tells me that this is baked. Sigh. |
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Something tells me that a POV-type display would have to be
brighter than a typical LCD screen pixel. |
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Oooh - chaotic double pendulum POV display? That'd be a really interesting technical challenge to build. |
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High resolution optical resolvers in the pivots, feeding back
position info to the light controller. Just have a grid map of the
desired image in memory and continuously map the pendulum
positions onto it, then illuminate LEDs accordingly. |
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Undergraduate project stuff. An 8-bit micocontroller could do it. |
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//3 LED columns and 1 cheese grater// |
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Why not add some spark gaps for more precisely programmable pain? |
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