LED BRIL­LIANCE

LED TVS ARE SLOWLY BUT SURELY PUSH­ING ITS PRE­DE­CES­SOR, THE LCD, INTO THE OBLIV­ION. BUT HOW DO THEY MAN­AGE TO BE SLIM­MER, BRIGHTER AND BET­TER?

Gadgets and Gizmos (India) - - KNOW TECH - TEXT AND GRAPH­ICS BY SAN­TOSH KUSH­WAHA

Light emit­ting diodes, or LEDs, are re­plac­ing the cold cath­ode flu­o­res­cent lamps (CCFL) used in con­ven­tional LCD dis­plays. LEDs are tiny light bulbs that fit eas­ily into an elec­tri­cal cir­cuit and are ca­pa­ble of cre­at­ing light. They have no fil­a­ments and hence don’t gen­er­ate much heat. An LED TV is ac­tu­ally an LCD panel that has been il­lu­mi­nated by th­ese light-emit­ting diodes.

LEDs con­sist of small semi­con­duc­tors, which glow dur­ing ex­po­sure to elec­tric cur­rent. This cur­rent flows be­tween LED an­odes, which are pos­i­tively charged elec­trodes, and LED cath­odes, which are neg­a­tively charged elec­trodes. As the elec­trons stream across the semi­con­duc­tor, they cre­ate elec­tro­mag­netic ra­di­a­tion. Some forms of this elec­tro­mag­netic ra­di­a­tion can take the form of vis­i­ble light.The light that is cre­ated an LED can be of any colour and can even be ul­tra­vi­o­let or in­frared. This colour de­pends on the ma­te­rial used to make the semi­con­duc­tor and the cur­rent run through it. Tiny LEDs are al­ready re­plac­ing the tubes that light up LCD HDTVs to make dra­mat­i­cally thin­ner televisions.

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