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Pixel defects on screens
For active matrix TFTs with a resolution of
1920 x 1080 pixels
, each of which consist of three sub-
pixels (red, green, blue), there are a total of
approx. 6.2
million
control transistors in use. Due to
this very high number of transistors and the associated extremely complex manufacturing processes
used, occasionally one or more pixels can fail or become incorrectly controlled.
In the past, there were a number of approaches for defining the permitted number of pixel defects.
However, these approaches were mostly very complicated and varied from one manufacturer to the
next. When handling warranty issues for all of its display products, MEDION therefore adheres to the
strict and transparent requirements of the standard
ISO 9241-307, Class II;
which has been briefly
summarised below.
5 Pixel
Zeilen
Sub-Pixel
Pixel
blau
grün
rot
5 P
ix
el
The ISO standard ISO 9241-307 defines, amongst other things,
the generally applicable guidelines relating to pixel defects. Pixel
defects are categorised into four fault classes and three defect
types. Every individual pixel consists of three sub-pixels, each of
which is assigned a basic colour (red, green, blue).
Pixel fault class
Defect type 1
Continuously lit pixel
Defect type 2
Continuously
black pixel
Defect type 3
Defect sub-pixel
lit
black
0
0
0
0
0
I
1
1
2
1
0
1
3
5
II
2
2
5
5-n*
0
0
2xn*
10
III
5
15
50
50-n*
0
0
2xn*
100
IV
50
150
500
500-n*
0
0
2xn*
1000
n* = 1,5
The table describes the maximum number of pixel failures allowed on the screen, before a warran-
ty claim arises. A warranty claim may be applicable if the above number of defects in a category is ex-
ceeded.
