Explanatory information about standard ISO 9241-3
Explanatory information about standard
ISO 9241-3
Lit or unlit pixels
Today's production techniques cannot guarantee an absolutely fault-free screen display. Depending
on the total number of pixels (resolution), there may 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 structure in a pixel which
extends the pixel function.
The maximum permitted number of faulty pixels is stipulated in the international standard
ISO 9241-3.
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 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 and 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 corresponding 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 and 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 unlit pixels plus 5 lit or 10 unlit
subpixels, or a corresponding combination, may be faulty (1 lit subpixel counts as two unlit
subpixels).
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