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LCD Monitor Quality and Pixel Policy
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LCD Monitor Quality and Pixel Policy
HP uses selected high quality panels for the manufacture of its LCD
monitors. Nevertheless, the display may have cosmetic imperfections
that appear as small bright or dark spots. This is not specific to HP
but linked to the current state of the art of LCD manufacturing.
In fact, an LCD screen is made of millions of small “sub-pixels” that
are each turned on or off by a transistor and it is extremely difficult to
manufacture millions of perfect transistors on a large surface.
Therefore, no manufacturer can currently guarantee 100% defect-
free panels at a reasonable price.
How visible a defect is depends on its nature an location.
Each pixel is made up of one red, one green and one blue sub-pixel.
• A defect in a sub-pixel is not very visible, and can often only be
perceived against specific backgrounds.
• Adjacent sub-pixel defects are more visible than “geographically
dispersed” defects.
• A full-pixel defect (all three R/G/B sub-pixels always on or always
off) is quite visible.
HP does not accept any full-pixel defects upon shipment. The vast
majority of monitors do not have visible imperfections. On the other
hand, HP is obliged - for the reasons outlined before - to accept the
possibility of a few sub-pixel defects.
HP has established clear standards for the maximum number of
imperfections per panel that can be tolerated. Your display has been
checked to comply with these standards.
If you are interested in the technicalities you can find the details of
HP’s pixel policy below.
Details of HP’s Pixel Policy
To identify defective pixels, the monitor should be viewed under
normal operating conditions, preferably in its native resolution, and
from a normal viewing distance of at least 50 cm (16 in.).