A look into dead pixels- 2007 (page 14: Nec)

Nec

Nec Display Solutions quickly answered our questionnaire. In short, for them it’s the ISO 13406-2 and then they could not respond to the following questions. This is unfortunate, especially from a company that targets for excellence and image professionals, a group that doesn’t tolerate defects too well.

If we surf their site a little, we find something different than what they told us. There we read in the FAQs (translated from the French website) :

What do dead pixels mean in liquid crystal displays?

In manufacturing, millions of transistors are mounted into each liquid crystal screen. Certain manufacturing restrictions sometimes result in dead pixels. A "dead pixel" can be in the form of a contrasted or black dot. A contrasted point is visible when the displayed image is entirely gray. A black dot is visible when the displayed image is entirely red, green, or blue.

According to our manufacturing norms, up to 10 dead pixels are permitted. However, when they are grouped, we judge this on a case by case basis depending on the missing colors and the distance between pixels.

Below adds to their official response :