ORGANIC LED (OLEDs) LIGHTS CONSUME LESS ENERGY

 An organic light emitting diode (OLED), also light emitting polymer (LEP) and organic electro luminescence (OEL), is a light-emitting diode (LED) whose emissive electroluminescent layer is composed of a film of organic compounds. The layer usually contains a polymer substance that allows suitable organic compounds to be deposited. They are deposited in rows and columns onto a flat carrier by a simple "printing" process. The resulting matrix of pixels can emit light of different colors.

 Such systems can be used in television screens, computer monitors, small, portable system screens such as cell phones and PDAs, watches, advertising, information and indication. OLEDs can also be used in light sources for general space illumination, and large-area light-emitting elements. OLEDs typically emit less light per area than inorganic solid-state based LEDs which are usually designed for use as point-light sources.

 In the context of displays, OLEDs have a significant advantage over traditional liquid crystal displays (LCDs). OLEDs do not require a backlight to function. Thus, they can display deep black levels, draw far less power, and can be much thinner and lighter than an LCD panel. OLED displays also naturally achieve much higher contrast ratio than LCD screens using cold cathode fluorescent lamp (CCFL) and newer LED backlights.

Is it not possible to generate electricity from wind in a train which is moving at its average speed for a long duration?

It is possible to generate electricity from a wind mill located atop a moving train. Although as plausible and tempting as this may sound, a closer analysis would reveal that such a venture would eventually defeat its very purpose.

A train cruising at its average speed would pierce the air around at speeds sufficient to drive a windmill. The energy generated from this apparatus could be considerable since the train runs for a long duration as the case in point. But the placement of this apparatus atop or beside the train’s compartment would generate a drag force opposing the direction of the train’s movement.

This overhead would reduce the train’s speed and thereby necessitate the engine to spend much more energy to retain its speed. The extra energy which the engine requires to keep up its speed would be much more than the energy generated from the windmill. Added to this is the inevitable problem of friction which causes energy loses while converting energy in one mechanical to another mechanical form.This question recalls the zeal behind perpetual motion which prevailed in the early 17th century. None of such ventures could succeed because no mechanical apparatus is devoid of friction.