Dead pixel
Updated: 08/03/2018 by Computer Hope
Alternatively known as a defective pixel, a dead pixel describes pixels that no longer light up. This issue can occur with any LCD (liquid-crystal display), 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 doesn't change color. For example, a pixel may have changed to yellow and remains yellow when it should have turned to another color.
Tip
Stuck pixels are easiest to detect against a black or dark background.