Explanatory informatio n about stan
dard I SO 9241-307
Explanatory information abou
t
standard ISO 9241-307
Permanently unlit or lit p ixels
Today’s production techniques cannot guarantee an absolutely fault-free screen displa y. Depending
on the total number of pixels (resolution), there may be a few constantly lit or unlit pixels 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 mplete fun ctionality of
the display.
Subpixel
A subpixel is a separately addressable internal structure within a pixel that
enhances the pixel function.
The maximum permitted number o f faulty pixels is stipulated in the international standard
ISO 9241-307. In a ccord ance with standard ISO 9241-3, LCD monitors by Fujitsu comply with Class
II for low resolutions and Class I for resolutions of 1600 x 900 (1440000 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 (re d, green and blue), so there are almost 3,9 million
subpixels in total. According to ISO 9241-3 (Class II), a maximum of 2 lit and 2 unlit
pixels and in addition 6 lit and 1 u nlit subpixels 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 1600 x 900 has 1600 x 900 = 1440000 pixels.
Each pixel consists of three subpixels (re d, green and blue), so there are almost 4,3 million
subpixels in total. According to ISO 9241-3 (Class I), a maximum of 1 lit and 1 unlit pixel and
in addition 3 lit and 1 unlit subpixels or a maximum of 7 unlit subpixels or a corresponding
combination may be faulty (1 lit subpixel counts as two unlit subpixels).
32 Fujitsu Technology Solutions
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