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GLOSSARY

Pixel error classes

Pixel errors are a side effect that is due to the specific technology and the way it is manufactured. For example, a 15 inch display with a native resolution of 1024 x 768 pixels is comprised of 2.4 million cells. At such a gigantic number, it is nearly impossible to ensure that each and every cell will function absolutely perfect. There is by all means a certain risk that an individual cell might have a malfunction and is permanently switched on or off. The result is a constantly lit or black pixel.


The norm ISO 13406-2 provided transparency in this regard as it stated clearly defined - and thereby comparable - pixel error classes that can be used in order to tell if a warranty claim can be submitted or not. By assigning a product to a pixel error class, monitor manufacturers oblige themselves that this product that they are mass producing complies with this class.

ISO 9241-307 is a newly made pixel error class directive, which replaces the previous standard ISO 13406-2.

When assigning to pixel error classes, the number of pixel errors as well as their quality (meaning the type of error) is considered.

The chart below should give an overview about the various pixel error classes and types (new ISO 9241-307). The amount of pixel errors is defined per one million pixels, in this respect.



The following chart should give an overview about the various pixel error classes and types (dated ISO 13406-2). The amount of pixel errors is defined per one million pixels, in this respect.



It's a fact that a permanently lit pixel (error type 1) annoys the user more than a permanently black pixel (error type 2) does. If it glows in one of the three colours red, green or blue, or when it's black, it is called a sub-pixel error; these are considered the least annoying type (error type 3). Due to these differences the respective pixel error tolerance of the three types, i.e. in class II, varies as well. While error types 1 and 2 are each to allowed to occur twice only, an amount of five defective sub-pixels (error type 3) is allowed.

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