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.
| 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 |
As of 2007, most manufacturers specify their products as Pixel Fault Class II.
Read more about this topic: ISO 13406-2
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