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 cann ot guarantee an absolutely fault-fre e screen display. D ep ending
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 complete functionality of
the display.
Subpixel
A subpixel is a separately addressable i nternal structu re within a pixel that
enhances the pixel function.
The maximum permitted number of faulty pixels is stipulated in the international standard ISO
9241-307. In accordance with standard ISO 9241-3, LCD monitors b y Fujitsu c omply with Class 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 blue), so t here are a lmost 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 or 13 unlit subpixels,
or a corresponding 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 pixel
consists of three subpixels (red, green and blue), so there are almost 11.1 million subpixels in total.
According to ISO 9241-3 (Class I), a maximum of 2 lit and 2 unlit pixels plus 9 lit or 18 unlit subpixels,
or a corresponding combination, may be faulty (1 lit subpixel counts as two unlit subpixels).
30 Fujitsu
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