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Q What is LED (Light Emitting Diode)?A LED (Light Emitting Diode) is the most commonly used backlight for Cellular phones. The LED backlight offers some benefits over the EL backlight. To start, the LED backlight does not consume an inverter, just a DC source of +3VDC+5VDC. Secondly, depending on the backlight configuration, the brightness can very bright, and thirdly, the life of the LED exceeds 50K hours.http//www.microtipsusa.com/content/Products_FAQS.asp17Abbreviation of light emitting diode, an electronic device that lights up when galvanizingity is passed through it. LEDs atomic number 18 usually red. They argon good for displaying images because they can be relatively small, and they do not burn out.http//www.webopedia.com/ confines/L/LED.htmlhttp//www.edgesystem.net/LED_light_therapy.htmA small indicator light most often used to show the power is on or the device is being used. LEDs are found on your computer case, monitor, printer, modem, CD-ROM drive, and hard drive.Wha t is Inside an LED?LEDs are special diodes that emit light when connected in a circuit. They are frequently used as "pilot" lights in electronic appliances to indicate whether the circuit is closed or not. A a clear (or often colored) epoxy case enclosed the heart of an LED, the semi-conductor eccentric. LED leadsside lead on flatside of bulb = electronegative      The two wires extending be number one the LED epoxy enclosure, or the "bulb" indicate how the LED should be connected into a circuit. The negative side of an LED lead is indicated in two ways 1) by the flat side of the bulb, and 2) by the shorter of the two wires extending from the LED. The negative lead should be connected to the negative terminal of a battery. LEDs operate at relative low voltages between about 1 and 4 volts, and draw up-to-the-minutes between about 10 and 40 milliamperes. Voltages and currents substantially above these values can melt a LED chip. The most importa nt part of a light emitting diode (LED) is the semi-conductor chip located in the center of the bulb as shown at the right. The chip has two regions separated by a junction. The p region is dominated by positive electric charges, and the n region is dominated by negative electric charges. The junction acts as a barrier to the flow of electrons between the p and the n regions. Only when sufficient voltage is applied to the semi-conductor chip, can the current flow, and the electrons cross the junction into the p region. In the absence of a large enough electric potential difference (voltage) across the LED leads, the junction presents an electric potential barrier to the flow of electrons.