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Charlieplexing as a basis function
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==== Problems with charlieplexing video ==== Ideally, we'd just turn on all the LEDs for a given frame of video at once, then turn them off. Sadly, we can't do that. Typical charlieplexing goes through the matrix LED by LED, turning them on, then turning them off, and moving on. If you do this fast enough, it sort of burns into the eye, a trick called "Persistence of Vision" or POV. However, POV only works well within certain parameters: if you take too long to strobe a frame, the video stops being video. If you go too fast, the lights are really dim. On the heart, for instance, if you want to turn on all the LEDs with POV, each LED can only be 1/27th its maximum possible brightness. In addition to these two problems, the display also tends to display "flicker" due to the time it takes to strobe across all the LEDs.
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