Philips Understanding Dark Dot Defects in Monitors

User Manual BDL3215E / BDL4225E

Dark Dot Defects

Black dot defects appear as pixels or sub-pixels that are always dark or “off”. These are the examples of black dot defects:

One dark dot

Two adjacent dark dots= 1 pair of dark dots

Two dark dots, specifica- tions defines the minimum distance between dark dots

Proximity of Pixel Defects

Because pixel and sub-pixels defects of the same type that are nearby one another may be more noticeable, Philips also specifies tolerances for the proximity of pixel defects. In the table below you can find specifications about:

v Allowed amount of adjacent dark dots = (adjacent dark dots =1 pair of dark dots) v Minimum distance between dark dots

v Total no. of all defective dots

Pixel Defect Tolerances

In order to qualify for repair due to pixel defects during the warranty period, a PDP / TFT panel in a Philips Plasma / LCD- display must have pixel or sub-pixel defects exceeding the tolerances listed in the following table.

BRIGHT DOT EFFECT	ACCEPTABLE LEVEL
MODEL	BDL3215E	BDL4225E
1 lit sub pixel	3	1
2 adjacent lit sub pixels	1	1
3 adjacent lit sub pixels (one white pixel)	0	0
50% ~ Less Dot (Weak Dot)	7	7
Distance between two bright dot defects*	5mm	5mm
Total bright dot defects of all types	7	7
BLACK DOT EFFECT	ACCEPTABLE LEVEL
1 dark sub pixel	9	8
2 adjacent dark sub pixels	3	3
3 adjacent dark sub pixels	1	1
Distance between two black dot defects*	NA	NA
Total black dot defects of all types	9	8
TOTAL DOT DEFECTS OF ALL TYPES	10	9

NOTE:

* 1 or 2 adjacent sub pixel defects = 1 dot defect.

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