Just had occasion to explore this, due to a bright failure in a fairly new unit.
After explaining what the pixelsare and how they fail, it just says:

"The HP display does not have more than:

 *
3 bright dots
 *
5 dark dots
 *
5 total bright and dark dots
 *
No more than two adjacent (less than 2.5 mm edge-to-edge) defective sub-pixels"

Nowhere does it actually say they will/my/might replace if more pixels fail, it just says they wont!!!!
What sort of wording is that?
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c00041393

Regards,

John Pitman

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