> Yeah, but, I thought it contains stuff like a half-wave plate (which is 
> nanometers thick) and stuff.

Actually the half-wave plate (or quarter-wave plate) is part of the 
polariser sheet (which contains lots of other layers), these are typically 
0.2-0.4mm thick and can easily be seen attached to both sides of the glass. 
We expect most candidates to at least have a very basic idea how an LCD 
works (we tell them this before the interview).

Other optical sheets in the backlight, like the diffuser and prism array 
sheets are thinner, but still easily visible and handle-able as they are all 
the same size as the display itself.  In fact you can run your finger nail 
along the sheet to see if has any prism structure on it, you could probably 
work out the spacing of the prisms from the pitch of the sound somehow 
without the need for any microscope.  Also there is another sheet in there 
that just looks like a mirror, but obviously it doesn't reflect all the 
light or the display wouldn't work.  THat's another good one to ask them 
about.

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