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15.2. Errori di pixel sui Smart-TV
Nonostante vengano utilizzati i più recenti metodi di produzione, a causa
dell‘elevata complessità delle tecnologie, in alcuni rari casi può verificarsi il mal-
funzionamento di uno o più pixel.
Per i TFT a matrice attiva e con una risoluzione di 3840 x 2160 pixel, dei qua-
li ognuno è formato da tre sotto-pixel (rosso, verde, blu), si utilizzano complessi-
vamente circa 24,9 milioni di elementi di comando. A causa di questo elevato
numero di transistor e del processo produttivo estremamente complesso, talvol-
ta può capitare che qualche pixel o sottopixel non si attivi o funzioni scorretta-
mente.
Classe di errore dei
pixel
Tipo di errore 1
pixel
sempre illuminato
Tipo di errore 2
pixel
sempre nero
Tipo di errore 3
sottopixel difettoso
luminoso 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
Per ogni classe e per ogni tipo, il numero di errori ammessi fa riferimento a un milione di pixel e deve essere convertito
in base alla risoluzione fisica dello schermo.
L’apparecchio è conforme allo standard europeo ISO 9241-307 classe II (classe di pixel difettosi).
5 Pixel
Linee
Sub-pixel
Pixel
blu
verde
rosso
5 Pixel
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