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Norme européenne EN 9241-307 classe II
Les écrans LCD à matrice active (TFT) d'une résolution de 1024 x 600 pixels, composés
respectivement de trois sous-pixels (rouge, vert et bleu), font appel à un total d'environ
1,8 millions de transistors. Compte tenu de ce très grand nombre de transistors et des
processus de fabrication extrêmement complexes qui y sont associés, il peut se produire
par endroits des pertes ou un mauvais adressage de pixels ou de sous-pixels individuels.
Par le passé, il existait de nombreuses méthodes permettant de définir le nombre d'erreurs
de pixels tolérées. Mais elles étaient généralement très compliquées et variaient fortement
d'un fabricant à l'autre. C'est la raison pour laquelle MEDION, en matière de garantie, se
conforme aux exigences strictes et transparentes de la norme EN 9241-307, classe II pour
tous les écrans TFT. Ces exigences se résument comme suit :
La norme EN 9241-307 propose entre autres une définition des caractéristiques relatives
aux erreurs de pixels.
Les erreurs de pixels sont répertoriées en quatre classes et trois types d'erreurs. Chaque
pixel se décompose à son tour en trois sous-pixels correspondant aux couleurs de base
(rouge, vert, bleu).
Composition des pixels :
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