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15.2. Pixels défectueux avec les téléviseurs 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 to-
tal 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 adressage de pixels ou de sous-pixels individuels.
Classe d'erreurs de
pixels
Type d'erreur 1
Pixel allumé en per-
manence
Type d'erreur 2
Pixel noir en perma-
nence
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 résolution physique de lécran.
Votre appareil est conforme à la norme européenne ISO 9241-307, classe II (classe d’erreurs de pixels).
5 Pixels
Lignes
Sous-pixels
Pixels
bleu
vert
rouge
5 Pixels
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