LED Televisions

An LED (Light Emitting Diode) display is a flat panel display that uses LED backlighting instead of the cold cathode flourescent (CCFL) backlighting used in most other LCDs. The use of LED backlighting allows for a thinner panel, lower power consumption, better heat dissipation, a brighter display, and better contrast levels. LED backlit LCD TVs use the same TFT LCD technologies as CCFL backlit LCD TVs. Picture quality is primarily based on TFT LCD technology independent of backlight type. While not an LED display, a television using this display is called an “LED TV” by some manufacturers and suppliers. In the UK, the Advertising Standards Authority has made it clear in correspondence that it does not object to the use of the term “LED TV,” but does require it to be clarified in any advertising.

Three forms of LED may be used:
White edge-LEDs around the rim of the screen, using a special diffusion panel to spread the light evenly behind the screen (the most usual form)
An array of LEDs arranged behind the screen whose brightness are not controlled individually
A dynamic “local dimming” array of LEDs that are controlled individually or in clusters to achieve a modulated backlight light pattern