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. Depending
on the total numb er of pixels (resolution), there may be a few constantly lit or unlit pixels or subpixels.
Pixel
A pixel co nsists of 3 subpixe ls, normally red, green and blue. A pixel is
the smallest element 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 pixel function.
The maximum permitted number of fa ulty pixels is stipulated in the intern ational standard ISO
9241-307. In a ccordance with standard ISO 9241-3, LCD monitors 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 w ith a resolution of 1280 x 102 4 has 1280 x 1024 = 1310720 pixels. Each pixel
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 or 13 unlit subpixels,
or a corresp onding combination, may be faulty (1 lit subpixel counts as two unlit subpixels).
A flat-screen monitor w ith a resolution of 1920 x 108 0 has 1920 x 1080 = 2073600 pixels. Each pixel
consists of three subpixels (red, green and blue), so there are almost 6.2 million subpixels in total.
According to ISO 924 1-3 (Class I), a maximum of 2 lit and 2 unlit pixels plus 5 lit or 10 unlit subpixels,
or a corresp onding combination, may be faulty (1 lit subpixel counts as two unlit subpixels).
Fujitsu 31
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