A bright pixel (also called a hot pixel) occurs when a liquid crystal subpixel or OLED emitter is permanently stuck in the on state, emitting light against dark and black backgrounds.
Fill the screen with solid colors to easily spot stuck or dead pixels on your monitor.
Attempt to revive stuck subpixels by rapidly cycling high-contrast colors in the affected area.
Fill your screen with pure primary, secondary, black, and white fields to inspect overall panel cleanliness.