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13.2. Smart TV pixel faults
Despite the state-of-the-art production 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 resolution of
3,840 x 2,160
pixels , which are each made up of three sub-pixels (red,
green, blue), there are a total of approx. 24.9 million
control elements in use. Occasionally pixels or individu-
al sub-pixels can fail or become incorrectly controlled be-
cause of this very high number of transistors and the ex-
tremely complex manufacturing process used in this
context.
Pixel defect 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 dis-
play.
Your device complies with the European ISO 9241-307 Class II standard (pixel defect class).
5 Pixel
Rows
Sub-Pixel
Pixel
blue
green
red
5 P
ix
e
l