This project has some unique challenges for circuit design.

  1. The aspect ratio of the PCB is very high, measuring 5mm x 65mm. This produces a bottleneck for signals to traverse the PCB
  2. The PCB must be flexible as it is wrapped around the metal core.
  3. The PCB is double sided, as all of the upper layer must be dedicated to collecting light and for the LED display.
  4. The small surface area necessitates a very high density, which is unusual for a flex PCB.