Medion P57581, User Manual

Page: 23 / 31

Pixel defects on screens
23
Pixel defects on screens
5 Pixel
Rows
Sub-Pixel
Pixel
blue
green
red
5 P
ix
e
l
For active matrix TFTs with a resolution of
1,920 x 1,080 pixels, which are each made up of
three sub-pixels (red, green, blue), there are a to-
tal of approximately 6.2 million control transistors
in use. Due to this very high number of transistors
and the associated extremely complex manufac-
turing processes used, occasionally one or more
pixels can fail or become incorrectly controlled.
The ISO standard ISO 9241-307 defi nes, amongst
other things, the generally applicable guidelines
relating to pixel defects. Pixel defects are catego-
rised 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
Pixel constantly lit
Defect type 2
Pixel constantly
black
Defect type 3
Defective 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 permitted number of defects for every type named above in each class of pixel
defect refers to one million pixels and must be converted accordingly to match the
physical resolution of the display.
Your device complies with the European ISO 9241-307 Class II standard (pixel defect
class). Pixel defects up to the specifi ed maximum number are not covered by the
warranty.