70
12.2. LCD TV pixel faults
Despite the most modern produc-
tion methods, in rare cases there
may be individual or multiple pixel
drop-outs (dead pixels) due to the
highly complex technology.
For active matrix TFTs with a re-
solution of
1920 x 1080 pixels
,
which are each made up of three
sub-pixels (red, green, blue), the-
re are a total of
approx. 6.2 milli-
on
control elements in use. Occasi-
onally one or more pixels can fail or
become incorrectly controlled be-
cause of this very high number of
transistors and the associated extremely complex manufacturing processes used.
Pixel fault
class
Defect type 1
Continuously
lit pixel
Defect type 2
Continuously
black pixel
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 (class of pi-
xel defect).
5 Pixel
Zeilen
Sub-Pixel
Pixel
blau
grün
rot
5 P
ix
e
l
