Pixel Policy - Philips 191TV4L User Manual

9 Pixel policy

Philips strives to deliver the highest quality
products. We use some of the industry's most
advanced manufacturing processes and practice
stringent quality control. However, pixel or
sub pixel defects on a flat monitor panel are
sometimes unavoidable. No manufacturer can
guarantee that all panels will be free from pixel
defects, but Philips guarantees that any monitor
with an unacceptable number of defects will be
repaired or replaced under warranty. This notice
explains the different types of pixel defects and
defines acceptable defect levels for each type.
In order to qualify for repair or replacement
under warranty, the number of pixel defects on
a monitor panel must exceed these acceptable
levels. For example, no more than 0.0004% of
the sub pixels on a monitor may be defective.
Furthermore, Philips sets even higher quality
standards for certain types or combinations
of pixel defects that are more noticeable than
others. This policy is valid worldwide.
Pixels and Sub pixels
A pixel, or picture element, is composed of
three sub pixels in the primary colors of red,
green and blue. Many pixels together form an
image. When all sub pixels of a pixel are lit, the
three colored sub pixels together appear as a
single white pixel. When all are dark, the three
colored sub pixels together appear as a single
black pixel. Other combinations of lit and dark
sub pixels appear as single pixels of other colors.
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Types of Pixel Defects
Pixel and sub pixel defects appear on the screen
in different ways. There are two categories of
pixel defects and several types of sub pixel
defects within each category.
Bright Dot Defects: bright dot defects appear
as pixels or sub pixels that are always lit or 'on'.
That is, a bright dot is a sub-pixel that stands out
on the screen when the monitor displays a dark
pattern.
These are some types of bright dot defects:
One lit red, green or blue sub pixel
Two adjacent lit sub pixels:
- Red + Blue = Purple
- Red + Green = Yellow
- Green + Blue = Cyan (Light Blue)
Three adjacent lit sub pixels (one white pixel)