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FR
DE
IT
NL
EN
14.2. Pixelfouten bij lcd-tv's
Ondanks het gebruik van de mo-
dernste productiemethoden kun-
nen vanwege de zeer complexe
techniek in zeldzame gevallen en-
kele of meerdere pixels uitvallen.
Bij actieve-matrix TFT-schermen
met een resolutie van 1920 x 1080
(MD 31462 / 31463) / 1366 x 768
(MD 21514 / 21515 / 31460 / 31461)
pixels, die zijn samengesteld uit elk
drie subpixels (rood, groen, blauw),
worden in totaal ca. 6,2 (MD 31462
/ 31463) / 3,1 (MD 21514 / 21515
/ 31460 / 31461) miljoen aanstu-
ringselementen gebruikt. Door dit zeer grote aantal transistoren en het daarmee
gepaard gaande, uiterst complexe productieproces kan er sporadisch sprake zijn
van uitvallende of verkeerd aangestuurde pixels of afzonderlijke subpixels.
Pixelfoutklas-
se
Fouttype 1
continu verlich-
te pixel
Fouttype 2
continu zwarte
pixel
Fouttype 3
defecte subpixel
verlicht 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 het voornoemde type wordt in iedere foutklasse
uitgedrukt per miljoen pixel en moet dan worden omgerekend naar de toepasselij-
ke fysieke schermresolutie.
Dit toestel voldoet aan de Europese norm ISO 9241-307 Klasse II (pixelfoutklasse).
5 Pixels
Regels
Subpixel
Pixel
blauw
groen
rood
5 Pixels
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