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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 21512 / 21513) / 1366 x 768
(MD 21510 / 21511) pixels, die
zijn samengesteld uit elk drie sub-
pixels (rood, groen, blauw), wor-
den in totaal ca. 6,2 (MD 21512 /
21513) / 3,1 (MD 21510 / 21511)
miljoen aansturingselementen ge-
bruikt. Door dit zeer grote aantal transistoren en het daarmee gepaard gaande, ui-
terst complexe productieproces kan er sporadisch sprake zijn van uitvallende of ver-
keerd 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
74


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