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17.2. Pixelfouten bij Smart-tv’s
Ondanks het gebruik van de rmodernste productiemethoden kunnen,
vanwege de zeer complexe techniek, in zeldzame gevallen enkele of
meerdere lichtpuntjes uitvallen.
Bij TFTs met actieve matrix en een resolutie van 3840 x 2160 pixels,
die zijn samengesteld uit elk drie subpixels (rood, groen, blauw), wor-
den in totaal ca. 24,9 miljoen aansturingselementen gebruikt. Door
dit zeer hoge aantal transistoren en het daarmee gepaard gaande, ui-
terst complexe productieproces kan er sporadisch sprake zijn van uit-
vallende of verkeerd aangestuurde pixels of afzonderlijke subpixels.
Pixelfoutklasse Fouttype 1
continu
verlichte pixel
Fouttype 2
continu
zwarte pixel
Fouttype 3
defecte subpixel
verlicht zwart
00000
I112
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 het voornoemde type wordt in iedere foutklasse uitgedrukt per miljoen pixel en moet
dan worden omgerekend naar de toepasselijke fysieke schermresolutie.
Dit toestel voldoet aan de Europese norm ISO 9241-307 Klasse II (pixelfouten).
5 Pixels
Regels
Subpixel
Pixel
blauw
groen
rood
5 Pixels
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