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A LED TV backlight is a form of illumination used in liquid crystal displays (LCDs). As LCDs do not produce light by themselves—unlike, for example, cathode ray tube (CRT), plasma (PDP) or OLED displays—they need illumination (ambient light or a special light source) to produce a visible image. Backlights illuminate the LCD from the side or back of the display panel, unlike frontlights, which are placed in front of the LCD.

A LED TV backlight for Lg is a liquid-crystal display that uses LEDs for backlighting instead of traditional cold cathode fluorescent (CCFL) backlighting. LED-backlit displays use the same TFT LCD (thin-film-transistor liquid-crystal display) technologies as CCFL-backlit LCDs, but offer a variety of advantages over them. While not an LED display, a television using such a combination of an LED backlight with an LCD panel is advertised as an LED TV by some manufacturers and suppliers.

LED TV backlight for Samsung features igh brightness up to 700 nits. What's more, the backlight has long operating life, typically lasting over 100,000 hours. It is more energy saving with wide scope of application. And also, it's more environmentally friendly and easy to install.

When compared with earlier CCFL backlights, using LED TV backlight for Sony offers wider color gamut (with RGB-LED or QDEF) and dimming range and greater contrast ratio. What's more, the backlight is very slim (some screens are less than 0.5 inches (13 mm) thin in edge-lit panels). And also, it's significantly lighter and cooler, as much as half the total chassis and system weight of a comparable CCFL. Typically, it features 20–30% lower power consumption and longer lifespan, which means that the backlight is more reliable.