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 call 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 new norm ISO 13406-2 provides transparency in this regard and states 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.
When assigning to pixel error classes, the number of pixel errors as well as their quality (meaning the type of error) is considered.
The following chart should give an overview about the various pixel error classes and types. The amount of pixel errors is defined
per one million pixels, in this respect.
A permanently lit pixel (error type 1) annoy the user more than a permanently black pixel (error type 2). When it illuminates in one of the three colors 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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