Dead Pixels: They are Defective Pixels on a Liquid Crystal Display (LCD) that are not performing as expected.
Variations of Dead Pixels: Dark Dot, Bright Dot, Partial Sub-Pixel Defects and Low Light Pixel.
Below you may see examples of Dead-Pixels:
Clean the screen gently with a Clean and Soft Cloth or a Nano Fibre Cloth and click “Start test”.
Press “F11” Key If Your Browser Window Doesn't Switch To Full Screen Automatically.
Press “Esc” Key Twice to End the Test and Return To This Page.
Click Left Mouse Button or Press “Space” to Change Test-Screen.
Pixels are Small, so you need to look carefully at all test screens. Keep Screen on Full Brightness to Detect Non-Function Pixel Easily.