A dead pixel is a bad pixel

Now that everybody has, or plans on having, an LCD monitor it's important to know where manufacturers position themselves when it comes to answer the dreaded question: can I exchage my brand new screen for another one with no dead pixels?

I have no personal experience on this, but I have seen it a lot from the other side and customers get rather angry when they find their money hasn't been well spent. It's an unpleasant policy from some computer shops: not telling the buyer what's the deal with dead pixels and not letting them see the monitor before purchasing. The problem is, once they find out what it is... they already have them (dead pixels usually come in groups and ready to party).

A cople of years ago, Behardware did a piece on this subject, and they are updating it now. There,  you will find everything you need to know about which manufacturers to trust and which ones not to. They answer some simple questions like "what is a dead pixel?", "what percentage of screens are affected?" or "should you take an optional dead pixel policy?". They also detail what the ISO 13406-2 norm is about and point out that "if a screen is ISO 13406 certified, but the manufacturer doesn’t indicate the class, it’s automatically a Class I(*), or in other words, is guaranteed for zero dead pixels".

(*) The ISO 13406-2 norm defines 4 classes of screens. “Class 1”, allows no defects. “Class 4” authorizes an incredible amount of dead pixels. An example of a "Class 1" screen can be found in some series from Phillips. This is not to say you should buy a Phillips monitor, it varies from one screen to another, from one series to the next. At the other side of the spectrum, you will find BenQ T series, pertaining to “Class 3” of the ISO norm. Those are the worst monitors you can actually buy, and they allow as many dead pixels as you can see below.

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Man, you'll finish earlier if you count alive pixels!


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