Philips Pixel Defect Policy - Philips 190CW8FW/93 Service Manual

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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 LCD 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 LCD panel
must exceed these acceptable levels. For example, no more than
0.0004% of the sub pixels on a 19"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
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
Black Dot Defects Black dot defects appear as pixels or sub
pixels that are always dark or 'off'. That is, 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:

Philips Pixel Defect Policy

BRIGHT DOT DEFECTS
MODEL
1 lit subpixel
2 adjacent lit subpixels
3 adjacent lit subpixels (one
white pixel)
Distance between two bright
dot defects*
Total bright dot defects of all
types
BLACK DOT DEFECTS
MODEL
1 dark subpixel
2 adjacent dark subpixels
3 adjacent dark subpixels
Distance between two black
dot defects*
Bright dot
Total black dot defects of all
types
BLACK DOT DEFECTS
MODEL
Total bright or black dot
defects of all types
Note:
* 1 or 2 adjacent sub pixel defects = 1 dot defect
All Philips monitors are ISO13406-2 Compliant
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
In order to qualify for repair or replacement due to pixel defects
during the warranty period, a TFT LCD panel in a Philips flat
panel monitor must have pixel or sub pixel defects exceeding the
tolerances listed in the following tables.
ACCEPTABLE LEVEL
190SW8
3 or fewer
1 or fewer
0
15 mm or more
3 or fewer
ACCEPTABLE LEVEL
190SW8
5 or fewer
2 or fewer
0
15 mm or more
5 or fewer
ACCEPTABLE LEVEL
190SW8
5 or fewer
190CW8
3 or fewer
1 or fewer
0
15 mm or more
3 or fewer
190CW8
5 or fewer
2 or fewer
0
15 mm or more
5 or fewer
190CW8
5 or fewer