>I wonder for the viewfinder application specifically.
> Rather than trying to make a teensy screen (although if you make LED's
> on a silicon wafer that shouldn't be so bad).
> do a scanned optical setup with lasers/LED's
> you can get little crystals that vary their refractive index with audio
> frequency or perhaps a piezo electric mirror system might work.
> That should let you get pretty much whatever resolution you need.
> Stack several systems if the scan rate is too low.

Cost is a major driver. Bear in mind that the eye has an immense effective 
resolution due to the ability to move the highly detailed centre area. A 
display could do this too - especially a projection one,  using eye 
tracking, but nobody does it yet.

BUT resolution is not the only thing that optical does better. The dynamic 
range of the eye is far far better than most displays. And there are various 
other things that get down to the equivalent of 'a smidgen of mains hum from 
the filaments' - but still needing to be accounted for.


   Russell

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