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Types of pixel error:
Type 1:
Pixels shining for a long time (bright, white point), although
not
activated.
A white pixel arises because of the illumination of all three sub-pixels.
Type 2:
Pixels not shining (dark, black point), although activated
Type 3:
Abnormal or defective sub-pixels coloured red, green or blue (e.g. shining for a long time with half
brightness, not lighting one colour, flashing or flickering, but not Type 1 or 2)
Addition: Cluster of Type 3 (= failure of two or more sub-pixels in a block of 5 x 5 pixels. A cluster is a field of 5 x 5
pixels (15 x 5 sub-pixels).
Classes of pixel error:
Error Class
Type 1
Type 2
Type 3
Cluster of Type 3
I
0
0
0
-
0
II
2
2
5
-
2
III
5
15
50
5
IV
50
150
500
50
The permitted number of errors of the types specified above in each class of error relates to a million pixels and
must be converted in accordance with the physical resolution of the display.
A maximum
permitted
number in
Error Class II
follows from this:
For a resolution of
M. pixel
Sub-pixels
(Type, see 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
1600 x 900 (20“ wide)
1.440000
4.320000
3 3 7 - 3
1680 x 1050 (20“ wide, 22“ wide)
1.764000
5.292000
4 4 10 - 4
1920 x 1080 (23" wide)
2.073600
6.220800
4 4 10 - 4
1920 x 1200 (25" wide)
2.304000
6.912000
4 4 10 - 4
Error Class I is only used in the case of special applications, e.g. in the medical sector, and is associated with
corresponding supplementary costs. Error Class II has become established as the standard for manufacturers
conscious of quality and with very good display units.
Example:
A 20” display unit consists of 1600 horizontal and 900 vertical scanning elements (pixels), that is 1,440,000 pixels
in total. This gives a factor of about 1.4 in relation to one million pixels.
Error Class II therefore allows 3 errors of both Type 1 and Type 2, 7 Type 3 errors and 3 Type 3 clusters.
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