Explanatory information abo ut stan
dard ISO 9241-307
Explanatory information abou
t
standard ISO 9241-307
Permanently unlit or lit p ixels
Today’s production techniques cannot guarantee an absolute ly fault-fre e screen display. Depending
on the total number of pixels (resolution), there may be a few constantly lit or unlit pixe ls 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 smallest element that can be generated by complete fun ctionality of
the display.
Subpixel
A subpixel is a separately addressable internal structure within a pixel tha t
enhances the pixel function.
Pixel fault All 3 subpixels are lit/unlit. The result is a b righter or darker pixel.
Subpixel fault Only one subpixel is lit/unlit. The result is a pixel with missing colours.
The maximum permitted number of f aulty pixels is stipulated in the international stan dard
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 occur.
Examples:
A flat-screen monitor with a resolution of 1280 x 1024 has 1280 x 1 024 = 1,310,720 pixels. Each
pixel consists of three subpixels (red, gree n and blue), making a total of abou t 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 corresponding combination, may be faulty (1 lit subpixel counts as two unlit subpixels).
A flat-screen display with a resolution of 1920 x 1200 has 1920 x 1200 = 23040 00 pixels. Each
pixel consists of three subpixels (red, gree n and blue), making a total of abou t 6,9 million subpixels.
According to ISO 9241-3 (Class I), a maximum of 2 lit and 2 unlit pixels plus 5 lit or 11 unlit subpixels,
or a corresponding combination, may be faulty (1 lit subpixel counts as two unlit subpixels). Because
Fujitsu supplies displays that are free of pixel faults, only subpixel faults enter into the evaluation.
56 Fujitsu
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