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N-LINE OWNERS MANUAL
13
Pixel policy (ISO 13406-2 Scan Guidelines )
TFT monitors are precise units made up of a set number of pixels. Unfortunately this can be seen as a weakness.
Pixels are made up the three sub-pixels being red, green and blue each consisting of their own transistors that
controls whether or not it lights up. Due to the way in which panels are made, defects can unfortunately appear
resulting in ‘dead pixels’ which cannot be repaired neither can it be predicted when the failure may occur.
The monitor can be working at 100% however can consist of pixels or sub-pixels which are either:
a) Permanently dark or light which is not always evident OR
b) A constant flash which is more noticeable.
Fortunately there is an ISO 13406-2 (Class II) standard which covers the maximum number pixels on any given panel.
There are 4 classes.
Class I monitors are guaranteed products which do not have any defects at all .
Class II specification consists of the following faults permissible: 2 x Type 1, 2 x Type 2, 5 x Type 3 and 2 x Type 4.
Class III and IV are not being explained, for they have more defect pixels and are used in office environments.
The pixel faults are defined in the following way:
Type 1) constant bright pixel
Type 2) constant dark pixel
Type 3) defect pixel, either constantly bright (red, green, blue or constantly dark)
