Alternatively referred to as a defective pixel, a dead pixel is a term used to describe pixels that no longer light up. This issue can occur with any LCD, such as those used with desktop computers, televisions, mobile devices, and laptop screens. Dead pixels are often easiest to detect against a white background.
A stuck pixel is where the pixel illuminates, but will not change to a different color. For example, a pixel may have changed to yellow, and then remains yellow when it should have turned the color green. Usually, stuck pixels are easiest to detect against a black or dark background.