Dead Pixels: black, white or colorful?
When talking about Dead Pixels, we do not mean the mildly popular British sitcom about three friends fixated on a fictitious online role-playing game, but pixels on an LCD that aren’t working properly: failing to reproduce the correct light levels.
Starting with the basics, on a standard TFT display, a pixel consists of three sub-pixels: red, green and blue. When for some reason one of those sub-pixels is stuck in the wrong position blocking the light from passing through that layer, a small dark dot appears on the screen – that’s the bad dead pixel. When, however, the entire pixel is stuck in the wrong position opposing to the one above, this allows all light to pass through that layer and creates a white pixel which we can call a bright or lit bad pixel. There is another version of that lit bad pixel, and that is a little dot that is either red, green or blue depending on which sub-pixel happens to be stuck permanently letting the light through. While there are more scenarios where a pixel can be faulty, these three summarise the most common situations pretty well.