Much easier to do this, I would think:
http://www.youtube.com/watch?v=fi4P-Bwc6g8http://www.das-labor.org/wiki/LaserExposer --- In Homebrew_PCBs@yahoogroups.com, kabowers@... wrote:
>
> On Sat, 30 Jun 2012 12:41:50 -0600, you wrote:
>
> >I was thinking a single row of LEDs with the board being carried through by
> >push wheels. Not quite as snazzy as one LED/pixel, though more feasible
> >perhaps. Though, I don't really know how feasible it is to have a row of
> >2000+ Individually addressable LEDs anyways.
> >
> >Although, this does remind me of the 3D printers that harden layer by
> >layer of plastic using a projector. Though, it would mean we'd need a
> >photoresist sensitive to visible light.
> >
> >Sent from my iPad
> >
> >
>
> What says you can't space the LEDs farther apart across the narrow dimension and
> place the board in a carrier? Then make multiple passes with the carrier along
> the long dimension stepping the LED assembly sideways a small increment each
> pass. This would require good tolerance/repeatability on the long dimension (which
> wouldn't be difficult as it would only move back and forth). You get the same
> result as a high density line of LEDs, just slower.
>
> Writing the driver software would be interesting too 8=)
>
> If you are into machining think of the way an automatic surface grinder works.
> Keith Bowers WB4LSJ- Thomasville, NC
>