Explanatory inform ation about stan
dard ISO 9241-307
Explanatory information abou
t
standard ISO 9241-307
Permanently un lit or lit p ixels
Today’s prod uction techniques cannot guaran tee an absolutely fault-free screen display. Dep ending
on the total number of pixels (resolution), there m ay 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 complete functionality of
the display.
Subpixel
A subpixel is a separately addressable internal s tructure within a pixel that
enhances the pixel function.
The maximum permitted number of faulty pixels is stipulated in the inte rnational standard
ISO 9241-3 07. In accordance with standard ISO 9241-3, LCD monitors by Fujitsu comply with Class
II for low resolutions and Class I for resolutions of 1680 x 105 0 (1764000 pixel) and higher.
Examples:
A flat-screen monitor with a resolution of 1280 x 1024 has 1280 x 1024 = 1310 720 pixels. Each pixel
consists o f th ree s ubpixels (red, green and blue), so there are a lmost 3.9 m illion subpixels in total.
According to ISO 9241-3 (Class II), a m aximum of 3 lit an d 3 unlit pixels plus 7 lit or 13 unlit subpixels,
or a corresponding combination, may be faulty (1 lit subpixel coun ts as two unlit subpixels).
A flat-screen monitor with a resolution of 1920 x 1200 has 1920 x 1200 = 2304 000 pixels. Each pixel
consists o f th ree s ubpixels (red, green and blue), so there are a lmost 6.9 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 11 u nlit subpixels,
or a corresponding combination, may be faulty (1 lit subpixel coun ts as two unlit subpixels).
30 Fujitsu Technology Solutions
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