You Know Those Persistence-Of-Vision Displays?
They’re usually in the form of a wand vibrating back and forth or a thing spinning in a circle with a line of LEDs on the end. I saw one of the spinning ones yesterday, and it gave me an idea.
Instead of having just one vertical line at the end of a spinning arm, make an entire array from the center out to the edge, both sides, plus the top and the outside edge. Using the same persistence of vision/fast-blinking light method, you can draw a 3D image without a lot more effort than the current 2D system.
It would be heavier, and require more power to spin it, but it’s still just a 2D display. No actual new technology would be required. You could do animation and everything. And the intriguing possibility of seeing the outside and inside of the projected object at the same time.
It wouldn’t be freestanding in open space, but still pretty awesome.
The Japanese have probably invented it already.
