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14.2. Pixelfehler bei LCD-TVs
Trotz modernster Fertigung kann
es auf Grund der hochkomplexen
Technik in seltenen Fällen zu Aus-
fällen von einzelnen oder mehreren
Leuchtpunkten kommen.
Bei Aktiv Matrix TFTs mit einer Auf-
lösung von 1920 x 1080 (MD
31284 / 31285) / 1366 x 768 (MD
31282 / 31283) Pixel, welche sich
aus je drei Sub-Pixel (Rot, Grün,
Blau) zusammensetzen, kommen
insgesamt ca. 6,2 (MD 31284 /
31285) / 3,1 (MD 31282 / 31283)
Mio. Ansteuerelemente zum Ein-
satz. Aufgrund dieser sehr hohen Anzahl von Transistoren und des damit verbun-
denen äußerst komplexen Fertigungsprozesses kann es vereinzelt zu einem Ausfall
oder zur fälschlichen Ansteuerung von Pixel bzw. einzelnen Sub-Pixel kommen.
Pixelfehler-
klasse
Fehlertyp 1
ständig leucht-
ender Pixel
Fehlertyp 2
ständig schwar-
zer Pixel
Fehlertyp 3
defekter Subpixel
leuchtend schwarz
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
Die erlaubte Anzahl von Fehlern der o. g. Typen in jeder Fehlerklasse bezieht sich
auf eine Million Pixel und muss entsprechend der physikalischen Auflösung der Dis-
plays umgerechnet werden.
Ihr Gerät entspricht der europäischen Norm ISO 9241-307 Klasse II (Pixelfehlerklas-
se).
5 Pixel
Zeilen
Sub-Pixel
Pixel
blau
grün
rot
5 Pixel
73


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