oled full ppt
TRANSCRIPT
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OLEDSemester IVElectronics &Communication Engineering
Prepared By- Dishank (13BEC021) Kevin (13BEC074)
Guided By- Prof. Usha Mehta
ORGANIC
LIGHT
EMMITING
DIODE
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ContentWhat is an OLED?How is it made?How do OLEDs emit light? Types of OLEDsAdvantages and DisadvantageFuture Of OLEDsConclusion
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INTRODUCTION
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These all devices may be possible in the near future with the help of a technology called Organic Light-Emitting Diodes.
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What is an OLED?
An OLED is any light emitting diode in which organic layers are responsible for light emission.
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The Basic Principal
Electroluminescence is a process in which a material emits light in response to electrical fieldapplied across it.
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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.
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How do OLEDs Emit Light?
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How it works?
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Types of OLEDsPassive-matrix OLEDActive-matrix OLEDTransparent OLEDTop-emitting OLEDFoldable OLEDWhite OLED
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Passive Matrix
The organic layers are between strips of cathode and anode.
The intersections form the pixels.
Easy to make
Uses more power
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Active-matrix OLED
Full layers of cathode and anode.
Anode overlays a thin film transistor (TFT).
Requires less power
Higher refresh rates
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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.
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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.
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White OLED
White OLEDs emit white light that is brighter, more uniform and more energy efficient.
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Why it’s so great? Less power consumption Lower cost in the future Flexible Display Thin display Safer for environment
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Better contrast ratio
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Wider Viewing Angle
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Major Drawbacks
LifespanEasily damageableOutdoor performanceComplex fabrication methods
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OLED VS OTHERS
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Future Aspects Finding a cheap way to produce “Roll-To-Roll” Manufacturing Increasing efficiency of blue OLED Increasing Lifespan of OLED
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Corporation in OLED’s
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Conclusion
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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
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Thank You