IBM THINKPAD 760C/CD (9546) - Manual (Page 325)

1120 LCD Front Cover
Important
The LCD for the notebook computer contains over
921,000 thin-film transistors (TFTs). A small number
of missing, discolored, or constantly lighted dots is
characteristic of TFT LCD technology, but excessive
pixel problems can cause viewing concerns. The LCD
should be replaced if the number of missing,
discolored, or lighted dots in any background is 21 or
more.
ThinkPad 560 (2640) 313