Wednesday, 5 January 2011

About LED technology

About LED technology
  • About LED technology
  • Brand : Buytvstore
  • Category : Articles

A light-emitting diode (LED) is a semiconductor light source. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet and infrared wavelengths.

When a light-emitting diode is forward biased (switched on), electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence and the color of the light (corresponding to the energy of the photon) is determined by the energy gap of the semiconductor.

A LED TV is an LCD TV that uses LED backlighting rather than the cold cathode fluorescent lights used in traditional LCD televisions.

The use of LED backlighting has a dramatic impact, resulting in a thinner panel, less power consumption, and a brighter display with better contrast levels. It also generates less heat than an ordinary LCD TV.

This backlight does not change the quality in the image of the monitors or televisions because the panel technology is the same.

The LEDs can come in three forms: dynamic RGB LEDs which are positioned behind the panel, white Edge-LEDs positioned around the rim of the screen which use a special diffusion panel to spread the light evenly behind the screen (the most common) and full-array which are arranged behind the screen but they are incapable of dimming or brightening individually.

Practically, LED TVs differ from conventional LCD TVs because they produce images with greater dynamic contrast. With Edge-LED lighting LED TVs can be extremely slim. Models on the market can be approximately one inch thick, offer a wider color gamut, especially when RGB-LED backlighting is used and generally 20-30% lower power consumption.


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