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LED TECHNOLOGY

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Information about LED TECHNOLOGY
Science-Technology

Published on April 29, 2011

Author: aSGuest96519

Source: authorstream.com

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Slide 1: NAME: OSAMA MEHMOOD ALI ID NO: 13139 GROUP: BS TELECOM SUBJECT: ELECTRONIC WORKSHOP DATE: 30-APRAIL-2011 ASSIGNED BY:MANSOOR IBRAHEM 1 OSAMA MEHMOOD ALI Slide 2: LED stand for Light Emitted Diode(electronic components that let electricity pass in only one direction) that emit visible light when electricity is applied, much like a light bulb. When many LEDs are side-by-side, they can create pictures, such as the scrolling red LED signs found everywhere. 2 OSAMA MEHMOOD ALI INTRODUCTION A relatively low-energy means of emitting light, light emitting diode (LED) technology is used in many electronic devices used frequently in the average home. LED is different from the standard light bulb seen in most homes because it uses an electrified semi conductive material to produce light instead of an electrified filament. A nearly omnipresent form of lighting, LED technology is used in computers, televisions, remote controls, and flashlights, as well as in signs, traffic lights, and architectural and stage lighting. What is LED Technology? Slide 3: Advantages Of LED Technology Reduce power consumption by up to80%. Power direct of light not heat. No light pollution-direct coherent light source with a high contrast at lower levels and zero light overspill. Significant reduced carbon emissions. Long lifespan-15 years-low maintenance cost on bulb replacement and disposals. Enhanced comfort level OSAMA MEHMOOD ALI 3 Slide 4: Working Of LED Technology LED can be placed in abusive environments. LED can be “AC” and “DC” powered depending on the model. LED do not produce “RF” to interface with radio equipment. LED last about 100,000 hours of continuous use. White LED can be made completely waterproof for use in many marine applications. OSAMA MEHMOOD ALI 4 Slide 5: Forward voltage drop (VF) and forward current (IF) curve, the curve indicated that, when the forward voltage exceeds a certain threshold value (about 2V), known as the turn-on voltage, the can be approximated that, IF and VF is proportional. The current maximum IF Ultra Bright LED up to 1A, while the VF is usually 2 ~ 4V. As the LED’s optical properties are usually described as a function of current, rather than a function of voltage, luminous flux ( φV ) and the relationship between the IF curve, therefore, constant current source driver can better control the brightness. In addition, LED’s forward voltage drop larger range (up to 1V above), but the picture above the VF-IF curve indicated, VF will cause small changes in the larger, IF change, causing more brightness big change. Therefore, using constant voltage LED light source driver can not guarantee the consistency and affect LED reliability, lifetime and lumen maintenance. Therefore, the super-bright LED is usually driven by constant current source. Principle Of LED Technology OSAMA MEHMOOD ALI 5 Slide 6: Future Prospect The light is of high quality and tamper proof. The model is patented and no one can duplicate it and cheat community. We can provide brighter and brighter lights year after year. Even better of urban market will available for regular scale and service. OSAMA MEHMOOD ALI 6 Slide 7: LED technology is increasingly used in ever more diverse applications, offering dynamic colored lighting as well as subtle effect and display lighting through many forms of stand alone and integrated luminaries. The demand for LED-based lighting looks set for rapid growth as LED efficacy levels steadily rise and as building operators become increasingly aware of the potential savings in time, money and energy, provided by correctly driven and thermally managed LED solutions. Conclusion OSAMA MEHMOOD ALI 7

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