An LED TV uses less power, provides a brighter display with better contrast, a thinner panel, and lesser heat dissipation than a conventional LCD TV. This is because an LED TV uses light-emitting diodes for backlighting versus CCFLs used by conventional LCD TVs. The display of an LED TV is not an LED display, so a more technically correct name for it would be "LED-backlit LCD television".
There are 3 types of LED TVs based on their backlighting methods:
- Edge-LEDs (the most common) are positioned around the rim of the screen and use a special diffusion panel to spread the light evenly behind the screen.
- Dynamic RGB LEDs: This backlighting technique allows specific areas on the screen to be dimmed.
- Full-array LEDs where LEDs are arranged behind the screen but are incapable of dimming or brightening individually.
edit Differences between traditional LCD and LED TVs
edit Dynamic contrast
RGB Dynamic LEDs show truer blacks and whites and thus get higher dynamic contrast ratio (which is desirable in a TV), at the cost of less detail in small bright objects on a dark background (such as star fields)
edit Slim frame
Edge-LED backlighting technique allows an LCD TV to be extremely thin. LED televisions that are only 1 inch thick are also available.
An LED TV offers more colors, especially ones that use RGB-LED backlighting.
On average, LED TVs are priced higher than traditional LCD TVs that use CCFLs for backlighting.
edit Power Consumption
LED TVs use energy-efficient light emitting diodes (LED) for backlighting. These consume less power than cold cathode fluorescent lamps (CCFL) used in traditional LCD televisions. Power savings are typically 20-30%.
edit Videos explaining the differences
This video explains the basic difference in backlighting techniques in traditional LCD and LED TVs.
This video talks about the technology differences between LCD and LED televisions.