An LCD TV, or liquid-crystal display television, is a flat-panel television that uses liquid crystals to produce images. LCD TVs are thin and light, making them a popular choice for consumers. They are used in a wide range of applications, including television sets, computer monitors, instrument panels, aircraft cockpit displays, and indoor and outdoor signage. LCD screens have replaced heavy, bulky, and less energy-efficient cathode-ray tube (CRT) displays in nearly all applications.

LCD displays use either a passive matrix or an active matrix display grid. The active matrix LCD is also known as a thin-film transistor (TFT) display. The passive matrix LCD has a grid of conductors with pixels located at each intersection in the grid. An active matrix has a transistor located at each pixel intersection, requiring less current to control the luminance of a pixel. For this reason, the current in an active matrix display can be switched on and off more frequently, which improves the refresh rate.

LED TVs are a type of LCD TV that uses LEDs to backlight the display, rather than the cold cathode fluorescent lights (CCFLs) used in most LCD TVs. All LCD TVs now use LED lights and are colloquially considered LED TVs.

In summary, an LCD TV is a flat-panel television that uses liquid crystals to produce images. They are thin, light, and used in a wide range of applications. LCD displays use either a passive matrix or an active matrix display grid, and LED TVs are a type of LCD TV that uses LEDs to backlight the display.