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Pixelfejl i LCD-skærme
I aktiv matrix TFT-skærme (TFT) med en opløsning på 1920 x 1080 pixel, som hver er sammensat
af tre subpixels (rød, grøn, blå), anvendes i alt ca. 6,2 mio. måltransistorer. På grund af det meget
høje antal transistorer og den yderst komplicerede fremstillingsproces som dette medfører, kan der i
enkelte tilfælde forekomme svigt eller et forkert valg af hhv. pixels eller enkelte subpixels.
5 Pixel
Linjer
Subpixel
Pixel
blå
grøn
rød
5 Pixel
Man har mange gange tidligere forsøgt med de mest forskellige
metoder at definere antallet af tilladte pixelfejl. Men de var for
det meste yderst komplicerede og helt forskellige fra mærke til
mærke. Man følger derfor ved garantibehandling af alle TFT-dis-
playprodukter de strenge og transparente krav i ISO 9241-307,
klasse II standarden. Her følger et kort sammendrag:
ISO-standarden ISO 9241-307 giver bl.a. almengyldige definitio-
ner af pixelfejl. Pixelfejlene kategoriseres i fire fejlklasser og tre fe-
jltyper. Hver enkelt pixel er igen sammensat af tre subpixels med
hver sin grundfarve (rød, grøn, blå).
Pixelfejlklasse Fejltype 1
konstant
lysende pixel
Fejltype 2
konstant
sort pixel
Fejltype 3
defekt subpixel
lysende sort
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
Det tilladte antal fejl af ovennævnte typer i hver fejlklasse skal ses i forhold til en million pixel og skal
omregnes svarende til displayets fysiske opløsning.
150


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