Pretty 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
