Philips 224CL2SB-00 - Manual (Page 24)

22
3.5 Philips' Flat Panel Monitors 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 Monitor panels
used in flat panel monitors 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 TFT Monitor panel must exceed these
acceptable levels. For example, no more than
0.0004% of the sub pixels on a 21.5" XGA
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.
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. 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)
Three adjacent lit sub pixels (one white pixel)