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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 malfunzionamento di
uno o più pixel.
Per i TFT a matrice attiva e con una
risoluzione di 1366 x 768 pixel, dei
quali ognuno è formato da tre sot-
to-pixel (rosso, verde, blu), si utiliz-
zano complessivamente circa 3,1
milioni di elementi di comando. A
causa di questo elevato numero di
transistor e del processo produttivo
estremamente complesso, talvolta può capitare che qualche pixel o sottopixel non
si attivi o funzioni scorrettamente.
Classe di erro-
re dei pixel
Tipo di errore 1
pixel sempre il-
luminato
Tipo di errore 2
pixel sempre
nero
Tipo di errore 3
sottopixel difettoso
illuminato nero
00 0 00
I1 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
Per ogni classe e per ogni tipo, il numero di errori ammessi fa riferimento a un milio-
ne 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 pi-
xel difettosi).
5 Pixel
Linee
Sub-pixel
Pixel
blu
verde
rosso
5 Pixel
219


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