> Well, if they're going to do things like guarantee no dead pixels, that
> probably reduces panel yield.

Also things like the general uniformity of the display - display a black 
image on your PC monitor and turn out all the lights, it's probably not 
very even.  Also that nothing will go wrong in use.  A dark or bright 
smudge on the front polariser is annoying for a PC monitor (you might 
take it back and get it replaced if you noticed it), but on a device 
used for medical diagnosis that absolutely cannot happen.  The only way 
to guarantee that is very extensive testing and much tighter quality 
control during production and throughout the whole supply chain.

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