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11.1. Pixelfouten bij tft-beeldschermen
Ondanks het gebruik van de modernste pro-
ductiemethoden kunnen er vanwege de zeer
complexe techniek in zeldzame gevallen een
of meer pixels uitvallen.
Bij actieve matrix-tft-schermen met een reso-
lutie van 1920 x 1080 pixels, die elk uit drie
subpixels (rood, groen en blauw) bestaan,
zijn er in totaal ca. 6,2 miljoen elementen
die moeten worden aangestuurd. Vanwe-
ge dit zeer hoge aantal transistors en het
daaraan gerelateerde uiterst complexe pro-
ductieproces is het mogelijk dat er af en toe
pixels of afzonderlijke subpixels uitvallen of
verkeerd worden aangestuurd.
Pixelfout-
klasse
Fouttype 1
continu
oplichtende
pixel
Fouttype 2
continu
zwarte pixel
Fouttype 3
defecte subpixel
oplichtend zwart
00000
I11
2
1
0
1
3
5
II 2 2
5
5-n*
0
2 x n*
10
III 5 15
50
50-n*
0
0
2 x n*
100
IV 50 150
500
500-n*
0
0
2 x n*
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 het beeldscherm
worden omgerekend.
Het toestel voldoet aan de Europese norm ISO 9241-307 klasse II (pixelfoutklasse).
Pixelfouten tot het aangegeven maximumaantal vallen niet onder de garantie.
5 Pixels
Regels
Subpixel
Pixel
blauw
groen
rood
5 Pixels
24


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