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 number of pixels (resolution), the re may be a few constantly lit or unlit pixels or subpixels.
RGB RGB RGB
RGB RGB RGB
1 2
1 = Pixel 2 = Subpixel
Pixel
A pixel consists of 3 subpixels, normally red, green and blue. A pixel is
the s mallest element that can be generated by complete functionality of
the display.
Subpixel
A subpixel is a separately addressable internal structure within a pixel that
enhances the pixel function.
Pixel fault All 3 su bpixels are lit/unlit. The result is a brighter or darker pixel.
Subpixel fault Only on e subpixel is lit/unlit. The result is a pixel with missing colours.
The maximum permitted number of faulty pixels is stipulated in the international s tandard
ISO 9241-307. The LCD displays from Fujitsu c omply to at least Class I. Fujitsu guarantees
displays that are free of pixel faults, so that only subpixel faults may o ccur.
Examples:
A flat-screen display with a resolution of 1280 x 1024 has 1280 x 1024 = 1310720 pixels. Each
pixel consists of three s ubpixe ls (red, green and blue), making a total of about 3 .9 million subpixels.
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 display with a resolution of 1920 x 1080 has 1920 x 1080 = 2073600 pixels. Each
pixel consists of three s ubpixe ls (red, green and blue), making a total of about 6 ,2 million subpixels.
According to ISO 9241-3 (Class I), a maximum o f 2 lit and 2 unlit pixels plus 5 lit or 10 unlit subpixels,
or a corresponding combination, may be faulty (1 lit subpixel counts as two unlit subpixels). Because
Fujitsu s upplies displays that are free of pixel faults, on ly subpixel faults enter into the evaluation.
Fujitsu 43
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