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11.2. Errori di pixel sui televisori LCD
Nonostante vengano utilizzati i più recenti metodi
di produzione, a causa dell’elevata complessità del-
le tecnologie, in alcuni rari casi può verificarsi il mal-
funzionamento di uno o più pixel. Per i TFT a matri-
ce attiva e con una risoluzione di 1366 x 768 pixel,
dei quali ognuno è formato da tre sotto-pixel (ros-
so, verde, blu), si utilizzano complessivamente ca.
3,1 milioni di elementi di comando. A causa di que-
sto elevato numero di transistor e del processo produttivo estremamente
complesso, talvolta può capitare che qualche pixel o sottopixel non si at-
tivi o funzioni scorrettamente.
Classe di
errore dei
pixel
Tipo di er-
rore 1
pixel sem-
pre illumi-
nato
Tipo di er-
rore 2
pixel sem-
pre nero
Tipo di errore 3
sottopixel difettoso
illumi-
nato
nero
00000
I112
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
La tabella indica il numero massimo di errori di pixel che possono verifi-
carsi sullo schermo senza essere coperti da garanzia. Se il numero di pixel
difettosi è superiore a quello indicato per una categoria, il difetto è coper-
to da garanzia.
5 Pixel
Linee
Sub-pixel
Pixel
blu
verde
rosso
5 Pixel
279


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