Philips 227E3QPHSU/27 Service Manual page 13

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. There are
two types of black dot defects:
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.
Bright Dot Defects
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
1 dark subpixel
2 adjacent dark subpixels
3 adjacent dark subpixels
Distance between two black dot defects*
Total black dot defects of all types
Total Dot Defects
Total bright or black dot defects of all types
Note:
1. 1 or 2 adjacent sub pixel defects = 1 dot defect.
2. This monitor is ISO9241-307 compliant. (ISO9241-307: Ergonomic requirement, analysis and compliance test
methods for electronic visual displays)
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
Acceptable level
5 or fewer
2 or fewer
5 or fewer
Acceptable level
5 or fewer
Meridian 3
3
1
0
>15mm
3
0
>15mm
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