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Medion MD 30759 - LIFE P18043 Manual

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10.2. Errori di pixel sui televisori LCD
Nonostante vengano utilizzati i più recenti me-
todi di produzione, a causa dell'elevata com-
plessità delle tecnologie, in alcuni rari casi può
verificarsi il malfunzionamento di uno o più
pixel.
Per i TFT a matrice attiva e con una risoluzio-
ne di 1920 x 1080 pixel, dei quali ognuno è
formato da tre sotto-pixel (rosso, verde, blu), si
utilizzano complessivamente circa 6,2 milio-
ni di elementi. A causa di questo elevato nume-
ro di transistor e del processo produttivo estremamente complesso, talvolta può
capitare che qualche pixel o sottopixel non si attivi o funzioni scorrettamente.
Classe di er-
rore dei pixel
Tipo di erro-
re 1
pixel sempre
illuminato
Tipo di erro-
re 2
pixel sempre
nero
Tipo di errore 3
sottopixel difettoso
illuminato 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
… 266 …


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