Definition Of Pixel Defects - Philips 150P4CG Service Manual

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14 150P4 LCD
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0. General
This section explains the different types of pixel defects and
defines acceptable defect levels of 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.
1. Definition of Pixels and Subpixels
A pixel, or picture element , is composed of three subpixels in the
primary colors of red, green and blue. Many pixels together from
an image. When all subpixels of a pixel are lit, the three colored
subpixels together appear as a single white pixel. When all are
dark, the three colored subpixels together appear as a single black
pixel. Other combinations of lit and dark subpixels appear as
single pixels of other colors.
Subpixel
Subpixel
Subpixel
2. Types of Pixel Defects
Pixel and subpixel defects appear on the screen in different ways.
Bright dot defects
Bright dot defects appear as pixels or subpixels that are always lit
or "on" . These are the types of bright dot defects:.
One lit red, green or blue subpixel
Two adjacent lit subpixels:
- Red + Blue = Purple
- Red + Green = Yellow
- Green + Blue = Cyan (Light Blue)
Three adjacent lit subpixels
(One white pixel)
Black dot defects
Black dot defects appear as pixels or subpixels that are always
dark or "off" TThese are the types of black dot defects:
One dark subpixel
Two or three adjacent dark subpixels
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Definition of Pixel Defects

3. 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 subpixel defects exceeding the
tolerances listed in the following tables.
BRIGHT DOT
DEFECTS
MODEL
1 lit subpixel
2 adjacent lit subpixels
3 adjacent lit subpixels
(one white pixel)
Distance between two
bright dot defects*
Bright dot defects within
20 mm circle
Total bright dot defects
of all types
Pixel
BLACK DOT DEFECTS
MODEL
1 dark subpixel
2 adjacent dark
subpixels
3 adjacent dark
subpixels
Distance between two
black dot defects*
Black dot defects within
20 mm circle*
Total black dot defects of
all types
TOTAL DOT DEFECTS
MODEL
Total bright or black dot
defects of all types
Note: 1 or 2 adjacent subpixel defects = 1 dot defect
ACCEPTABLE LEVEL
150P4 150B4
None None 8 or fewer
None None 3 or fewer
None None 1 or fewer
None None 15 mm or more
None None 3 or fewer
None None 8 or fewer
ACCEPTABLE LEVEL
150P4 150B4
4 or fewer 4 or fewer 8 or fewer
1 or fewer 1 or fewer 3 or fewer
None None 1 or fewer
15 mm or
15 mm or more 15 mm or more
more
3 or fewer 3 or fewer 3 or fewer
4 or fewer 4 or fewer 8 or fewer
ACCEPTABLE LEVEL
150P4 150B4
4 or fewer 4 or fewer 10 or fewer
150S4
150S4
150S4