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12.2. Pixelfouten bij LCD-TVs
Ondanks het gebruik van de modernste productiemethoden kunnen,
vanwege de zeer complexe techniek, in zeld-
zame gevallen enkele of meerdere lichtpunt-
jes uitvallen. Bij actieve-matrix TFT-schermen
met een resolutie van 1920 x 1080 pixel, die
zijn samengesteld uit elk drie subpixels (rood,
groen, blauw), worden in totaal ca. 6,2 mil-
joen aansturingselementen gebruikt. Door dit
zeer grote aantal transistoren en het daarmee
gepaard gaande, uiterst complexe productie-
proces kan er sporadisch sprake zijn van uitvallende of verkeerd aange-
stuurde pixels of afzonderlijke subpixels.
Pixel-
fout-
klasse
Fouttype 1
permanent
brandende pixel
Fouttype 2
permanent
zwarte pixel
Fouttype 3
defecte subpixel
verlicht zwart
00 000
I1 12
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
In de tabel wordt het maximaal toegestane aantal pixelfouten op het beeldscherm vermeld
zonder dat sprake is van een garantiegeval. Van een garantiegeval kan sprake zijn als het
hierboven aangegeven aantal fouten in een categorie wordt overschreden.
Dit toestel voldoet aan de Europese norm ISO 9241-307 Klasse II (pixelfouten).
5 Pixels
Regels
Subpixel
Pixel
blauw
groen
rood
5 Pixels
68


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