The presentation introduces light-emitting diodes (LEDs) and discusses their advantages and disadvantages. LEDs convert electrical energy to light and have benefits including high efficiency, dimming ability, slim design, long lifespan, and lower power consumption compared to other lighting technologies. However, LEDs can be more expensive initially and their color may shift with age and temperature. The presentation provides examples of LED applications in sensors, signs, signals, and mobile devices and concludes they are a very low energy light source that can last over 50,000 hours.

1. Welcome to our presentation
Group members:
Md. Imran Hossain
Id:
xxxx
Id:
yyy
Id:

2. Topics: LED
(Light-emitting diode )
Introduction of LED
Figure
Application
Advantages
Disadvantages
Remarkes/Comment

3. Light-emitting diode (LED)
• A light emitting diode (LED) is essentially a PN
junction op to -semiconductor that emits a
monochromatic light when operated in a forward
biased direction. LEDs convert electrical energy into
light energy.

4. Figures:

5. Advantages:
• Efficiency
• Dimming
• Slim Design
• Brighter Images
• Better Color
• Flicker-Free Images
• Better Picture Quality
• Longer lifespan and less environmental impact
• Lower Power Consumption

6. Disadvantages:
• LEDs are more expensive than
conventional lighting technologies
• LEDs can shift color due to age and
temperature
• LED is alot thinner than the LCD or
Plasma.
• Contrast ratios not consistent
• Much higher price[

7. Remarks:
A very low energy consumption level. Lasts much
longer than traditional lighting. It has been known
to last up to 50,000 hours. There is no infrared
lighting from LED lights. And there is no UV (Ultra
Violet) radiation, which is better for you and the
environment.

8. Application:
1. Sensor Applications (Medical Instrumentation, Bar Code Readers, Encoders )
2. Sign Applications (Mobile Phone, Digital Cameras, Lap Tops)
3. LED Signals (Traffic, Rail, Tower Lights, Runway Lights)
4. Mobile Applications (Mobile Phone, PDAs, Digital Cameras, General Backlighting)

9. References:
https://en.wikipedia.org/wiki/Light-emitting_diode
https://www.slideshare.net/aonalijafferry/copy-of-ledmodified1
https://www.google.com/search?q=led+hd+monitor&rlz=1C1CHB
F_enBD809BD809&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi
rs72NrLbeAhUDqY8KHSFxA7IQ_AUIDygC&biw=1267&bih=608#im
grc=FEOFXutte2MAEM:
https://ieeexplore.ieee.org/document/6006944