How can I enforce the use of CRT monitors?

I am thinking of a story where travel between worlds exists, but people have to "start over" on each world. So they can't just take their current computers to a new world. The monitors would be used to display some kind of wave or energy that is related to the travel.

My question is, are CRT monitors actually more simple to create or could we make an LCD or Plasma display quicker and easier if we were to start over? Or is it a situation where if you can make a CRT you can make a more flat monitor with just as much effort? Or is there some other factor that only a CRT can provide?

Note: the science-based tag is referring to the differences between CRT monitors and other forms of monitors, the inter-dimensional transport is obviously less hard.

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How can I enforce the use of CRT monitors?

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