Explanatory inform ation about stan
dard ISO 9241-307
Explanatory information abou
t
standard ISO 9241-307
Permanently un lit or lit pixels
Today’s prod uction techniques cannot guarantee an absolutely fault-fre e screen display. Depending
on the total number of pixels (resolution), there may be a fe w constantly lit or unlit pixe ls or subpixels.
Pixel
A pixel consists of 3 subpixels, normally red, green and blue. A pixel is
the smallest element that can be generated by co mple te fun ctionality of
the display.
Subpixel
A subpixel is a separately addressable internal structu re within a pixel that
enhances th e pixel function.
The maximum permitted number of faulty pixels is stipulated in t he international standard
ISO 9241-307. In a ccord ance with standard ISO 9241-3, LCD monitors by Fujitsu comply with C lass
II for low resolutions and Class 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 pixel
consists of three subpixels (red, green and b lue), so there are almost 3.9 m illion subpixels in total.
According to ISO 9241-3 ( Class II), a maximum of 3 lit and 3 unlit pixels plus 7 lit or 13 unlit subpixels,
or a correspon ding combination, may b e faulty (1 lit subpixel counts as two unlit subpixels).
A flat-screen monitor with a resolution of 1920 x 1080 has 1920 x 1080 = 2073600 pixels. Each pixel
consists of three subpixels (red, green and b lue), so there are almost 6.2 m illion subpixels in total.
According to ISO 9241-3 (Class I), a maximum of 2 lit and 2 unlit pixels plus 5 lit or 10 unlit subpixels,
or a correspon ding combination, may b e faulty (1 lit subpixel counts as two unlit subpixels).
34 Fujitsu
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