🚀 go-pugleaf

>>improvement that I kept thinking about but never built would be to
>>have only a one-dimensional row of LED's and somehow move them in
>>space to produce the 2-D field.

I once used an Infrared Scope with a viewer that used a vertical
column of stationary L.E.D.'s for a screen.  When one looked through
the eyepiece one was looking at a rotating cylinder with 5 or 6
flat mirrors mounted on it.  As the cylinder rotated the observer
saw the vertical L.E.D. column scan horozontally.  Obviously the
intensity of each L.E.D. was kept in sync with the horoz scan rate
due to cyliner rotation.

This provided a very adequate image.  Simple controls allowed one
to correct for small errors in synchronization.