Explanatory information about stan
dard ISO 9241-307
Explanatory information abou
t
standard ISO 9241-307
Permanently unlit or lit pixels
Today’s production techniques cannot guarantee an absolutely fault-free screen display. D epending
on the total numb er o f pixels (resolution), there may be a few constantly lit or unlit pixels or subpixels.
Pixel
A pixel consists of 3 subpixels, normally red, green an d blue. A pixel is
the smallest elemen t that can be gene rated by complete functionality of
the display.
Subpixel
A subpixel is a separately addressable internal structure within a pixel that
enhances the p ixel function.
The maximum pe rmitted number of faulty pixels is stipulated in the intern ational standard ISO
9241-307. In accordance with standard ISO 9241-3, LCD mo nitors by Fujitsu comply with Class II
for low resolutions and C lass I for resolutions of 1680 x 1050 (1764000 pixel) and higher.
Examples:
A flat-screen monitor with a resolution of 1280 x 1024 has 1280 x 1024 = 1310720 pixels. Each pixe l
consists of three subpixels (red, green and blue), so there are almost 3.9 million subpixels in total.
According to ISO 9241-3 (Class II), a maximum of 3 lit and 3 unlit pixels plus 7 lit o r 13 unlit subpixels,
or a c orresponding combination, may be faulty (1 lit subpixel counts as two unlit subpixels).
A flat-screen monitor with a resolution of 2560 x 1440 has 2560 x 1440 = 3686400 pixels. Each pixe l
consists of three subpixels (red, green and blue), so there are almost 11.1 million subpixels in total.
According to ISO 924 1-3 (Class I), a maximum o f 2 lit and 2 unlit pixels plus 9 lit or 18 unlit subpixels,
or a c orresponding combination, may be faulty (1 lit subpixel counts as two unlit subpixels).
Fujitsu Technology Solutions 31
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