LCD screens, or Liquid Crystal Displays, are flat-panel displays commonly used in televisions, computer monitors, and smartphones. They work by using liquid crystals that change alignment when an electric current is applied, allowing light to pass through and create images. This technology is known for its energy efficiency and ability to produce sharp, vibrant colors. One of the key components of an LCD screen is the backlight, which illuminates the liquid crystals from behind. Unlike older display technologies, such as CRT (Cathode Ray Tube), LCD screens are thinner and lighter, making them easier to transport and install in various devices.