I like the "opacity map", 'image_map' in the case of using POV-Ray, with a
'bump_map' idea the last person had said.
That way you'd just be using a texture by using one premade image put into the
image map and bump map to create the effect.  Real simple.  Something like a
woven cloth pattern perhaps where the spacing is one color for the 'transmit' of
it's index number.  The opaque "threads" being from near black to white for the
bump mapping, giving the screen more 3D depth.  I think the trouble in doing
such a thing (from experience) is the need for plenty of see-through space
otherwise you get only the screening showing.  A fix to that can be to apply
more of a gradient transparency to the "solid" parts of the image map for a
better overall semi-transparency instead of clear and not clear regions.

Bob

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