3D Persistence of Vision Display:

Cathode ray tube (CRT) televisions were mentioned as a 2D POV display in the 2D POV project description.The method of having a fixed light emitting substrate creates a very difficult design problem for 3D display applications. Each layer of substrate blocks the subsequent layers for the observer, or blocks the incident electrons from exciting the proper layer. This is where the moving substrate POV displays shine. If 1D updating elements, line segments of LEDs, are equally spaced, not parallel, and perpendicular to an axis of rotation, then a 3D display resolution will be the number of lines by the number of LEDs per line by the number of updates per rotation. The resolution units are in a mixed coordinate system. The system described will have a plane where the lines of LEDs block each other, so that not all of the display depth can be viewed in that plane. When looking down the rotation axis the situation changes, but the result depends on the placement of the updating elements with respect to each other and with respect to the rotation axis.