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Résolution de problèmes
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Pixels défectueux des écrans LCD
Malgré la méthode de fabrication ultramoderne
employée, le niveau technique 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 se
produire 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
permanence
Type d'erreur 2
Pixel noir en
permanence
Type d'erreur 3
Sous-pixel défectueux
allumé noir
0 0 0 0 0
I 1 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 nombre d'erreurs autorisé dans les types précités dans chaque classe d'erreur fait référence à un million
de pixels et doit être converti en fonction de la résolution physique de l'écran.
70


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