oled full ppt
TRANSCRIPT
OLEDSemester IVElectronics &Communication Engineering
Prepared By- Dishank (13BEC021) Kevin (13BEC074)
Guided By- Prof. Usha Mehta
ORGANIC
LIGHT
EMMITING
DIODE
ContentWhat is an OLED?How is it made?How do OLEDs emit light? Types of OLEDsAdvantages and DisadvantageFuture Of OLEDsConclusion
INTRODUCTION
These all devices may be possible in the near future with the help of a technology called Organic Light-Emitting Diodes.
What is an OLED?
An OLED is any light emitting diode in which organic layers are responsible for light emission.
The Basic Principal
Electroluminescence is a process in which a material emits light in response to electrical fieldapplied across it.
Cathode - The cathode injects electrons into emissive layer.
Emissive layer - This layer is made of polyfluorene that transport electrons from the cathode. This is where light is made.
Conducting layer - This layer is made of polyaniline that transport "holes" from the anode.
Anode – It is kept transparent.Usually made up of Indium tin oxide (ITO) that removes electrons.
Substrate - The substrate supports the OLED.
How do OLEDs Emit Light?
How it works?
Types of OLEDsPassive-matrix OLEDActive-matrix OLEDTransparent OLEDTop-emitting OLEDFoldable OLEDWhite OLED
Passive Matrix
The organic layers are between strips of cathode and anode.
The intersections form the pixels.
Easy to make
Uses more power
Active-matrix OLED
Full layers of cathode and anode.
Anode overlays a thin film transistor (TFT).
Requires less power
Higher refresh rates
Transparent OLEDs
Transparent OLEDs have only transparent components (substrate, cathode and anode)
When turned off, are up to 85 percent as transparent as their substrate.
Top emitting OLEDs
Top-emitting OLEDs have a substrate that is reflective.
Foldable OLED
Foldable OLEDs have substrates made of very flexible metallic foils or plastics.
White OLED
White OLEDs emit white light that is brighter, more uniform and more energy efficient.
Why it’s so great? Less power consumption Lower cost in the future Flexible Display Thin display Safer for environment
Better contrast ratio
Wider Viewing Angle
Major Drawbacks
LifespanEasily damageableOutdoor performanceComplex fabrication methods
OLED VS OTHERS
Future Aspects Finding a cheap way to produce “Roll-To-Roll” Manufacturing Increasing efficiency of blue OLED Increasing Lifespan of OLED
Corporation in OLED’s
Conclusion
REFERENCES
1. http://electronics.howstuffworks.com/oled.html 2. http://www.tridonic.com/ae/img/OLEDmodule_LUREON_REP.jpg3. http://
cdn1.bigcommerce.com/server4300/905b4/product_images/uploaded_images/how-do-leds-work.jpg
4. http://s.hswstatic.com/gif/oled-top-emitting.gif5. http://
www.homeinfo.hu/images/stories/kivitelezes/villamossag/OLED_5.jpg6. http://www.maximumpc.com/files/u90693/anatomy-full.jpg
Thank You