Explanatory informatio n about stan
dard I SO 9241-307
Explanatory information abou
t
standard ISO 9241-307
Permanently un lit or lit p ixels
Today’s production techniques cann ot guarantee an absolutely fault-fre e screen display. Depending
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 co mplete functionality of
the dis play.
Subpixel
A subpixel is a separately addressable internal s tructure w ithin a pixel that
enhances the pixel function.
The maximum permitted n umber of faulty p ixels is stipulated in the international standard ISO
9241-307. In accordance w ith standard ISO 9241-3, LC D monitors b y Fujitsu comply 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 an d 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 co rrespon ding combination, may be faulty ( 1 lit subpixel counts as two unlit subpixels).
A flat-screen monitor with a resolution of 1920 x 1080 has 1920 x 1080 = 2073600 pixels. Each pixel
consists of three subpixels (red, green an d blue), so there are almost 6.2 million subpixels in total.
According to ISO 9241-3 (Class I), a maximum of 2 lit and 2 u nlit pixels plus 5 lit or 10 unlit subpixels,
or a co rrespon ding combination, may be faulty ( 1 lit subpixel counts as two unlit subpixels).
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