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13. Pixels défectueux avec les écrans 5 Pixels
Lignes
Sous-pixels
Pixels
bleu
vert
rouge
5 Pixels
Les écrans TFT à matrice active d'une résolution de 1920 x 1080 pixels, se com-
posant 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.
La norme ISO 9241-307 propose entre autres une définition des caractéris-
tiques relatives aux erreurs de pixels. Les erreurs de pixels sont répertoriées en
quatre classes et trois types d'erreur. Chaque pixel se décompose à son tour
en trois sous-pixels correspondant aux couleurs de base (rouge, vert, bleu).
Classe d'erreurs de
pixels
Erreur de type 1
Pixel allumé en permanence
Erreur de type 2
Pixel noir en perma-
nence
Type d'erreur 3
Sous-pixel défectueux
Allumé Noir
00 0 00
I1 1
2
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 qu'il s'agisse d'un cas de garantie.
On est, dans certaines conditions, en présence d'un cas de garantie lorsque le nombre de défauts indiqué ci-dessus est
dépassé dans une catégorie.
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