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Medion MD99400 - Akoya E1234T Manual

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European EN 9241-307 Class II Standard
18. European EN 9241-307 Class II Standard
For active matrix LCDs (TFT) with a resolution of 1920 x 1200 pixels, each of which
consist of three sub-pixels (red, green, blue), there are a total of approx. 2.3 million
control transistors in use. Due to this very high number of transistors and the asso-
ciated extremely complex manufacturing processes used, occasionally one or more
pixels can fail or become incorrectly controlled.
In the past, there were a number of approaches for defining the permitted number
of pixel defects. However, these approaches were mostly very complicated and var-
ied from one manufacturer to the next. When handling warranty issues for all of its
display products, MEDION therefore adheres to the strict and transparent require-
ments of the standard ISO 9241-307, Class II; which has been briefly summarised
below.
The EN 9241-307 standard defines, amongst other things, the generally applicable
guidelines relating to pixel defects. Pixel defects are categorised into four fault class-
es and three defect types. Every individual pixel consists of three sub-pixels, each of
which is assigned a basic colour (red, green, blue).
Pixel structure
5 Pixel
Rows
Sub-Pixel
Pixel
blue
green
red
5 Pixel
Pixel defect types:
• Type 1:
permanently illuminated pixel (bright, white dot) even when not activated. A
white pixel occurs due to the illumination of all three sub-pixels.
• Type 2:
non-illuminated pixel (dark, black dot) even when activated.
• Type 3:
abnormal or faulty red, green or blue sub-pixel (e.g. permanently illuminated at
half brightness, one colour not illuminated, flashing or flickering but not type 1
or 2)
Supplement: Type 3 cluster (= failure of two or more sub-pixels within a 5 x 5 pixel
block). A cluster is a field of 5 x 5 pixels (15 x 5 sub-pixels).
… 48 …


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