What about 'burn-in'
with plasmas?

Burn-in can be a problem but not as much as it has
been in the past. When the picture becomes still (no movement) the possibility does exist but there have
been many technological improvements. One of them includes from the TV manufacture a feature called "wobble" When Plasmas first were available, the
burn-in was a problem, however, with the amount
of changes in technology this has become less
of a problem.