LCD monitors contain millions of pixels, each one composed of three subpixels: red, blue, and green. When all three are on, a pixel looks white. Other combinations create other colors. A pixel can ...

There may come a time when you feel the need to test whether the LCD display on your computer monitor is working fine. You may believe that the little dot is a dead pixel, so how do you make sure?

Liquid crystal displays (LCD) use a grid of definable points on a screen to display information. Used in many of Apple's products, including Cinema Displays, MacBooks and MacBook Pros, and the iPhone, ...