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29
7. Customer care and warranty
7. Customer care and
warranty
7.1 Philips’ Flat Panel Displays Pixel
Defect 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 the TFT
Display panels used in at panel Displays are
sometimes unavoidable. No manufacturer can
guarantee that all panels will be free from pixel
defects, but Philips guarantees that any Display
with an unacceptable number of defects will
be repaired or replaced under warranty. This
notice explains the different types of pixel
defects and denes acceptable defect levels
for each type. In order to qualify for repair
or replacement under warranty, the number
of pixel defects on a TFT Display panel must
exceed these acceptable levels. For example,
no more than 0.0004% of the sub pixels on a
Display 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.
subpixel
pixel
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.
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 Display displays a dark pattern. There are
the 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)
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