Some people that have got launch units of the Nintendo Switch have noticed some dead pixels on the screen. According to Nintendo, this is not a defect and nothing to worry about, apparently…
Nintendo talked about this on the official website. The question is “There are black or bright dots on the Nintendo Switch screen that do not go away, or there are dark or light patches on the screen.”
Nintendo’s answer is “Small numbers of stuck or dead pixels are a characteristic of LCD screens. These are normal and should not be considered a defect.”
This is somewhat annoying for Nintendo Switch owners. Not everyone experiences this, but at least it’s nothing too serious. If you are having major issues, please make sure to let Nintendo know of it ASAP. You should still be under warranty.