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Explanatory information about st an
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 to tal number of pixels (resolution), there may be a fe w 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 complete functionality of
the display.
Subpixel
A s ubpixel is a separately addressable internal structure 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 by Fujitsu comply with Class II
for low resolutions and Class I for resolutions of 168 0 x 1050 (1764000 pixel) and higher.
Examples:
A at-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 tota l.
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 co rrespon ding combination, may be fau lty (1 lit subpixel counts as two unlit subpixels).
A at-screen monitor with a resolution of 1920 x 1080 has 1920 x 1080 = 2073600 pixels. Each pixel
consists of three subpixels (red, green and blue), so t here are a lmost 6.2 million subpixels in tota l.
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 co rrespon ding combination, may be fau lty (1 lit subpixel counts as two unlit subpixels).
32 Fujitsu Tech nolo gy Solutions
36


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