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Medion MD 30657 - LIFE P15080 Manual

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11.2. Pixels défectueux avec les téléviseurs LCD (Full
HD)
Malgré la méthode de fabrication ultramoderne
employée, le niveau technique hautement com-
plexe peut, dans de rares cas, générer un ou
plusieurs points lumineux.
Les écrans TFT à matrice active d'une résolution
de 1920 x 1080 pixels, se composant chacun
de trois sous-pixels (rouge, vert, bleu), utilisent
au total près de 6,2 millions de transistors
de commande. Compte tenu de ce très grand
nombre de transistors et des processus de fabri-
cation extrêmement complexes qui y sont associés, il peut survenir par endroits
des pertes ou un mauvais adressage de pixels ou de sous-pixels individuels.
Classe d'er-
reurs de
pixels
Type d'er-
reur 1
Pixel allumé
en perma-
nence
Type d'er-
reur 2
Pixel noir en
permanence
Type d'erreur 3
Sous-pixel défectueux
Allumé Noir
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
Le nombre d'erreurs autorisé pour les types susmentionnés de chaque classe
d'erreurs se réfère à un million de pixels et doit être converti en fonction de la ré-
solution physique de l'écran.
5 Pixels
Lignes
Sous-pixels
Pixels
bleu
vert
rouge
5 Pixels
… 113 …


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