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Pixelfejl-typer:
Type 1: pixelen lyser vedvarende (lyst, hvidt punkt), selv om den ikke er valgt. En hvid pixel opstår når
samtlige tre subpixels lyser.
Type 2: pixelen lyser ikke (mørkt, sort punkt), selv om den er valgt.
Type 3: unormale eller defekte subpixels i farverne rød, grøn eller blå (f.eks. vedvarende lys med halv
lysstyrke, manglende lys i én farve, blinker eller blusser, men ikke af type 1 eller 2).
Tillæg: Cluster af type 3 ( = svigt af to eller flere subpixels i en blok på 5 x 5 pixels. Et cluster er et felt på 5 x 5
pixels (15 x 5 subpixels).
Pixelfejl-klasser:
Fejlklasse Type 1 Type 2 Type 3 Cluster af type 3
I 0 0 0 - 0
II 225 - 2
III 5 15 50 5
IV 50 150 500 50
Det tilladte antal fejl af de ovennævnte typer i hver fejlklasse refererer til en million pixels og skal omregnes
svarende til displayets fysiske opløsning.
Af dette følger et max. tilladt antal i fejlklasse II:
For en opløsning på Mio. Pixel Subpixels Type (s.o.)
1024 x 768 (38 cm) 0.786432 2.359296 2 2 4 - 2
1280 x 1024 (43, 46, 48 cm) 1.310720 3.932160 3 3 7 - 3
1600 x 1200 (48 cm) 1.920000 5.760000 4 4 10 - 4
1440 x 900 (48 cm wide) 1.296000 3.888000 3 3 7 - 3
1600 x 900 (51 cm wide) 1.440000 4.320000 3 3 7 - 3
1680 x 1050 (51 cm wide, 56 cm wide) 1.764000 5.292000 4 4 10 - 4
1920 x 1080 (60 cm wide) 2.073600 6.220800 4 4 10 - 4
1920 x 1200 (65 cm wide) 2.304000 6.912000 4 4 10 - 4
Fejlklasse I bruges kun til specialanvendelser, f.eks. på medicinområdet, og er forbundet med tilsvarende højere
omkostninger. Fejlklasse II har etableret sig som standard for kvalitetsbevidste producenter med meget gode
displays.
Eksempel:
Et 51 cm - display består af 1600 horisontale og 900 vertikale billedpunkter (pixels), i alt 1.440.000 pixels. I forhold
til en million pixels giver dette en faktor af ca. 1,4.
Fejlklasse II tillader dermed hhv. 3 fejl af type 1 og type 2 og 7 fejl af type 3 og 3 cluster af type 3.
Kopiering af denne håndbog
Dette dokument indeholder retligt beskyttede informationer. Alle rettigheder forbeholdes. Kopiering i mekanisk,
elektronisk og enhver anden form er uden forudgående skriftlig tilladelse fra fabrikantens side ikke tilladt.
117


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