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Pixelfouten bij LCD-TV‘s
Ondanks het gebruik van de allermo-
dernste productiemethoden kunnen,
vanwege de zeer complexe techniek, in
zeldzame gevallen enkele of meerdere
lichtpuntjes uitvallen.
Bij actievematrix TFT‘s met een resolu-
tie van 1920 x 1080 pixels, die zijn sa-
mengesteld uit elk drie subpixels (rood,
groen, blauw), worden in totaal ca. 6,2
miljoen Aansturingselementen gebruikt.
Door dit zeer hoge aantal transistoren en
het daarmee verbonden uiterst complexe
productieproces kan er sporadisch sprake
zijn van uitvallende of verkeerd aangestu-
urde pixels resp. afzonderlijke subpixels.
5 Pixels
Regels
Subpixel
Pixel
blauw
groen
rood
5 Pixels
Pixelfout-
klasse
Fouttype 1
Vaste pixels
Fouttype 2
Zwarte pixels
Fouttype 3
Defecte subpixels
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 de bovenstaande typen per foutklasse
heeft betrekking op een miljoen pixels en moet volgens de fysische resolutie
van het scherm worden omgerekend.
50


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