Pixel Defects On Screens - Medion AKOYA P55015 Bedienungsanleitung

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
Sub-Pixel rot
Pixel fault class
0
I
II
III
IV
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.
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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
Pixel
types. Every individual pixel consists of three sub-pixels, each of
which is assigned a basic colour (red, green, blue).
blau
grün
Defect type 1
Continuously lit pixel
0
1
2
5
50
Defect type 2 Defect type 3
Continuously Defect sub-pixel
black pixel
lit
0
1
2
15
150
black
0 0
2 1
1 3
0 5
5 0
5-n* 2xn*
0 10
50 0
50-n* 2xn*
0 100
500 0
500-n* 2xn*
0 1000
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