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21. Standard europeo EN 9241-307 classe II
Per gli LCD a matrice attiva (TFT) con una risoluzione di 1920 x 1080 pixel,
dei quali ognuno è formato da tre sotto-pixel (rosso, verde, blu), si utilizzano
complessivamente ca. 6,2 milioni di transistor di comando. A causa di questo
elevato numero di transistor e del processo produttivo estremamente complesso,
talvolta può capitare che qualche pixel o sotto-pixel non si attivi o funzioni
scorrettamente.
In passato, è stato tentato in diversi modi di definire il numero massimo di pixel
difettosi consentiti. Tuttavia, queste soluzioni erano molto complesse e totalmente
diverse da produttore a produttore. Per questo motivo MEDION applica alla
garanzia di tutti i prodotti con monitor TFT le severe e trasparenti disposizioni dello
standard EN 9241-307, classe II, riassunte brevemente di seguito.
Lo standard EN 9241-307 definisce, fra le altre cose, le disposizioni generali relative
ai pixel difettosi. I difetti dei pixel vengono classificati in quattro categorie e in tre
tipi di difetto. Ogni singolo pixel è formato da tre sotto-pixel, ognuno dei quali è di
un colore primario (rosso, verde, blu).
Struttura dei pixel
5 Pixel
Linee
Sub-pixel
Pixel
blu
verde
rosso
5 Pixel
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