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13. D-LED LCD TV pixel faults
Despite the most modern production methods, the highly complex technology involved
in producing this type of device means there may be individual or multiple pixel drop-outs
(dead pixels). This is rare, however.
For active matrix TFTs with a resolution of
1920 x 1080
pixels, which are each made up of
three sub-pixels (red, green, blue), there are a total of approx.
6.2
Mio. control elements in
use. Occasionally one or more pixels can fail or become incorrectly controlled because 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
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 permitted number of faults of the above-mentioned types in every fault class is based on a number of one million pixels
and must be recalculated in accordance with the actual physical resolution of the display.
5 Pixel
Rows
Sub-Pixel
Pixel
blue
green
red
5 P
ix
e
l
