On 12 Mar 2012 at 20:43, Tony Duell wrote:
  What about the Panaplex 7-segemnt gas discharge
displays?
 Or the gas discharge dot-matrix displays that include their own 'sift
 register)? You know how you can step a discharge round a dekatron tub,
 well at least one mnufacturer made a dot matrix display on that
 principle. You applied the next column of dots to the electrodes at
 one end, then sequenced the 2 control electrodes, and all the dots
 moved along one cloumn.  
I liked the mechanical project-type display, where a stepping
arrangement moved a strip of film.  Probably a bit large for an Elf,
though.
Nimo tubes, anyone?
--Chuck