At DOMO, we try to qualify under the ISO 13406-2 guidelines.
Pixel Fault Classes
The standard lists four classes of devices, where a device of a specified class may contain a certain maximum number of defective pixels. Three distinct types of defective pixels are described:
- type 1 = a hot pixel (always on, being colour white)
- type 2 = a dead pixel (always off, meaning black)
- type 3 = a stuck pixel (one or more sub-pixels (red, blue or green) are always on or always off)
The table below shows the maximum number of allowed defects (per type) per 1 million pixels.
|
Definition of Pixel Fault Classes – Maximum number of faults per million pixels |
|||||
|
Class |
Type 1 |
Type 2 |
Type 3 |
Cluster with more than one type 1 or type 2 faults |
Cluster of type 3 faults |
|
I |
0 | 0 | 0 | 0 | 0 |
|
II |
2 | 2 | 5 | 0 | 2 |
|
III |
5 | 15 | 50 | 0 | 5 |
|
IV |
50 | 150 | 500 | 5 | 50 |
Under ISO 13406-2, the general guideline has been laid that a total of 7 faulty pixels per 1,000,000 are assumed to be okay on an LCD. At DOMO we qualify under Class 2 and assume that the LCD of your device is okay even if there are 7 faulty pixels per 1,000,000.
