Vintage seven segment digits make up the display. These digits work the same ... On these digits, there are three connections on the coils. The middle one is power and the other two are used ...

The seven-segment LED display is ubiquitous ... It’s a rotating drum with the right contacts on the bottom side to make connections and turn on the right lights at the other end.

seven-segment display (Image courtesy of LXD, Inc.) In their natural state, liquid crystals line up with the orientation "rubbed" into the front and rear glass panels. The rubbings are microscopic ...