Philips 8000 41.5" 4K HDR 138 Hz Gaming Monitor (White) - Manual (Page 35)

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Three adjacent lit sub pixels (one white
pixel).
Note
A red or bright blue dot must be
more than 50 percent brighter than
neighboring dots, while a bright
green dot is 30 percent brighter than
neighboring dots.
Black Dot Defects
Black dot defects appear as pixels or
sub-pixels that are always dark or 'off'.
Meaning, a dark dot is a sub-pixel that
stands out on the screen when the
monitor displays a light pattern. These
are the types of black dot defects.
Proximity of Pixel Defects
Because pixel and sub pixels defects
of the same type that are near to one
another may be more noticeable,
Philips also specifies tolerances for the
proximity of pixel defects.
Pixel Defect Tolerances
To qualify for repair or replacement due
to pixel defects during the warranty
period, a TFT Monitor panel in a Philips
flat panel monitor must have pixel
or sub-pixel defects exceeding the
tolerances listed in the following tables.