They go all the way back to TOS. Best guess is some kind of correlative staus indicator for the sensors and main viewer. That is, showing roughly what part of the image has been most recently refreshed with the latest sensor data.
Sadly, we Treknologists have had to spend way too much mental run time figuring out possible and at least somewhat reasonable functions for set pieces and display artifacts that were originally just put in because It Looks Cool (TM).
--Jonah
Sadly, we Treknologists have had to spend way too much mental run time figuring out possible and at least somewhat reasonable functions for set pieces and display artifacts that were originally just put in because It Looks Cool (TM).
--Jonah