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13.2. Pixelfouten bij smart-tvs
Ondanks het gebruik van de modernste productiemetho-
den kunnen er vanwege de zeer complexe techniek in zeld-
zame gevallen een of meer pixels uitvallen.
Bij actieve matrix-tft-monitors met een resolutie van 3.840
x 2.160 pixels, die elk uit drie subpixels (rood, groen en
blauw) bestaan, zijn er in totaal ca. 24,9 miljoen elemen-
ten die moeten worden aangestuurd. Vanwege dit zeer
grote aantal transistors en het daaraan gerelateerde uiterst
complexe productieproces is het mogelijk dat er af en toe
pixels of afzonderlijke subpixels uitvallen of verkeerd wor-
den aangestuurd.
Pixelfoutklasse
Fouttype 1
continu oplichtende
pixel
Fouttype 2
continu zwarte
pixel
Fouttype 3 defecte subpixel
oplichtend zwart
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
Het toegestane aantal fouten van de bovenstaande typen in iedere foutklasse geldt per miljoen
pixels en moet afhankelijk van de fysieke resolutie van de monitor worden omgerekend.
Het toestel voldoet aan de Europese norm ISO 9241-307 klasse II (pixelfoutklasse).
5 Pixels
Regels
Subpixel
Pixel
blauw
groen
rood
5 Pixels
54


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