Post on 08-Apr-2018
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What is an OLED?
OLED - Organic Light Emitting Diode.
An OLED is any light emitting diode (LED) whichemissive electroluminescent layer is composed of afilm of organic compounds.
An OLED is an electronic device made by placing aseries of organic thin films between two conductors.
When electrical current is applied, a bright light isemitted.
A device that is 100 to 500 nanometers thick orabout 200 times smaller than a human hair.
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The OLED Structure
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History of OLEDs First developed in the early 1950s in
France
1960s - AC-driven
electroluminescent cells usingdoped anthracene was developed
In a 1977 paper, Shirakawa et al.Reported high conductivity in
similarly oxidized and iodine-dopedpolyacetylene.
In 1990 electroluminescence inpolymers was discovered.
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How OLEDs Emit Light ??
The battery or power supply of the device
containing the OLED applies a voltageacross the OLED.
An electrical current flows from the cathode
to the anode through the organic layers.
(an electrical current is a flow of electrons)
At the boundary between the emissive and
the conductive layers, electrons find electron
holes.
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TYPES OF OLEDs
} PASSIVE OLED
}ACTIVE OLED
} FLEXIBLE OLED
} TRANSPARENT OLED
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PASSIVE OLED
The organic layer is between strips of cathode and anode thatrun perpendicular.
The intersections form the pixels
Easy to make
Use more power
Best for small screens
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ACTIVE OLED
Full layers of cathode and anode
Anode over lays a thin film transistor (TFT)
Requires less power
Higher refresh rates
Suitable for large screens
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Flexible OLED
A flexible organic light emitting diode (FOLED) is a typeof organic light-emitting diode (OLED) incorporating a
flexible plastic substrate on which the
electroluminescent organic semiconductor is deposited.This enables the device to be bent or rolled while still
operating.
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Transparent OLED
Transparent OLEDs use transparent or semi-transparent contacts on
both sides of the device to create displays that can be made to be both
top and bottom emitting (transparent). TOLEDs can greatly improve
contrast, making it much easier to view displays in bright sunlight
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Current Research for OLEDs
Manufacturers focusing on finding acheap way to produceo "Roll-to-Roll" Manufacturing
Increasing efficiency of blueluminance
Boosting overall lifespan
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Applications of OLEDs TVs Cell Phone screens Computer Screens Keyboards (Optimus Maximus) Lights
Portable Divice displays
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OLEDs as a Light Source
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OLED Televisions
Sony
Released XEL-1 in February 2009. First OLED TV sold in stores. 11'' screen, 3mm thin $2,500 MSRP Weighs approximately 1.9 kg
Wide 178 degree viewing angle 1,000,000:1 Contrast ratio
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Optimus Maximus Keyboard
Small OLED screen on every key
113 OLED screens total
Each key can be programmed to preform a
series of functions Keys can be linked to applications
Display notes, numerals, special symbols,HTML codes, etc...
SD card slot for storing settings
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Advantages of OLEDs
} Thinner, lighter and more flexible
} Easier to produce and make into larger sizes
} Much faster response time
}
Consume significantly less energy
}Able to display "True Black" picture
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Continues
}Wider viewing angles
} Thinner display
} Better contrast ratio
} Safer for the environment
}Has potential to be mass produced inexpensively
}OLEDs refresh almost 1,000 times faster then LCDs
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Disadvantages of OLEDs
Cost to manufacture is high.
Overall luminance degradation.
Constraints with lifespan .
Easily damaged by water.
Limited market availability.
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Current OLEDs
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Future Uses for OLED
Lighting Flexible / bendable lighting Wallpaper lighting defining new ways to light a space Transparent lighting doubles as a window
Cell Phones Nokia 888
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Continues
Transparent Car Navigation System on Windshield Using Samsungs' transparent OLED technology Heads up display GPS system
Scroll Laptop Nokia concept OLED Laptop
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Continues
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THANKXX!!
By:
ANKUSH AGARWAL
R K 200 1 B 1 1