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12.2. Pixels défectueux des écrans LCD
Malgré la méthode de fabrication ultramoderne employée, le niveau tech-
nique hautement complexe 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 env.
6,2 millions de transistors de commande. Compte
tenu de ce très grand nombre de transistors et des
processus de fabrication extrêmement complexes qui
y sont associés, il peut survenir par endroits des pertes ou un mauvais adres-
sage 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 perma-
nence
Type d'erreur 3
Sous-pixel défec-
tueux
Allumé Noir
00 000
I1 12
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 tableau décrit le nombre d’erreurs de pixels maximum acceptable sur
l’écran sans quil s’agisse d’un cas de garantie. On est, dans certaines condi-
tions, en présence d’un cas de garantie lorsque le nombre d’erreurs indiqué
ci-dessus est dépassé dans une catégorie.
5 Pixels
Lignes
Sous-pixels
Pixels
bleu
vert
rouge
5 Pixels
150


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