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In addition:
A cluster of type 3 (= 2 or more defective sub-pixels in an array of 5 x 5 pixel). A cluster is an
array of 5 x 5 pixel (15 x 5 sub-pixel).
Classes of Pixel Failures:
Failure class
Type 1 Type 2 Type 3 Cluster v. Type 3
I
0
0
0
-
0
II
2 2 5 - 2
III
5
15
50
5
IV
50
150
500
50
The acceptable number of defects of the above mentioned types in each failure class refers to one million pixels
and has to be calculated according the physical resolution of the display.
This leads to a maximum
allowed
number in
class II type failure:
Resolution
Mn Pixel
Sub-Pixel
(Type s. above)
1024 x 768 (15")
0.786432
2.359296
2 2 4 - 2
1280 x 1024 (17,18, 19")
1.310720
3.932160
3 3 7 - 3
1600 x 1200 (19“)
1.920000
5.760000
4 4 10 - 4
1440 x 900 (19“ wide)
1.296000
3.888000
3 3 7 - 3
1680 x 1050 (20“ wide, 22“ wide)
1.764000
5.292000
4 4 10 - 4
Class I type failure only applies to special applications, e.g. medical applications, and results in corresponding
price increases. Class II type failure is the established standard for quality conscious manufacturers with high
quality displays.
Example 1:
A 15” XGA display consists of 1024 horizontal and 768 vertical picture dots (pixel), which amounts to a total of
786,432 pixels. Related to one million pixels this translates into a factor of about 0.8.
Class II type failure consequently allows for two defects each of type 1 and type 2 and 4 defects of type 3 and 2
clusters of type 3.
Example 2:
A 17” SXGA display consists of 1280 horizontal and 1024 vertical picture dots (pixel), which amounts to a total
of 1.31 million pixels. Based on one million pixels this translates into a factor of about 1.31.
Class II type failure consequently allows for three defects each of type 1 and type 2 and 7 defects of type 3 and
3 cluster of type 3.
These cases are normally not covered by warranty.
If the number of failures exceeds the figures of any category mentioned above then this may be covered by the
warranty.
