Medion LIFETAB P9514 Mode D'emploi page 161

European Norm EN ISO 13406-2 Class II
There have been several attempts in the past to define the acceptable number of defective
pixels. But this can be difficult and varies widely between different manufacturers.
We, therefore, adhere to the clear and strict requirements of ISO 13406-2, class II, for the
warranty handling of all LCD display products. These requirements are summarised below.
Within ISO-standard 13406-2 the general requirements regarding pixel defects are defined.
Pixel defects are classified into three failure types and four failure classes. Each individual
pixel is made up of three sub-pixels in the primary colours (red, green, blue).
Pixel structure
Types of Pixel Failures:

Type 1:
A constantly lit pixel (a bright, white spot), even though it is not addressed. A white
pixel is caused when all three sub-pixel are lit.

Type 2:
A pixel that does not light up (dark, black spot), although it is addressed

Type 3:
Abnormal or defective red, green or blue sub-pixels.
(E.g. constantly lit with half the brightness, one colour is not shining, blinking or
flickering, but not belonging to Type 1 or 2 Pixel Failures)
In addition: A cluster of type 3 (= 2 or more defective sub-pixels in an array of 5 x 5 pixel).
A cluster is an array of 5 x 5 pixel (15 x 5 sub-pixel).
28