Why would they use these?
Keep young children from opening it.
Looks like there are already people out there hacking this display:
Are you serious? It would take a very special young child
That's the description on Wikipedia.The recommended floor for that toy is six years. All the children six (and older) I have met are capable of working a screwdriver.
It looks like a POV device (Persistence Of Vision)
I would think it works like old crt pens did.The pen senses the positinn fromknowing the time from the start of the scan.In old days hardware did the rest.These days software
Maybe you can repair it.