shashank OLED

8/2/2019 shashank OLED

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OLED - Organic Light Emitting DiodeAn OLED is any light emitting diode (LED) which emissiveelectroluminescent layer is composed of a film of organic compounds.


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First developed in the early 1950s in France Early technology would emmite a short burst of light when a

voltage was applied . In 1987 the first light emitting diodes from thin organic

layers. In 1990 electroluminescence in polymers was discovered.


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Substrate (clear plastic, glass, foil) - The substrate supports the OLED. Anode (transparent) - The anode removes electrons (adds electron

"holes") when a current flows through the device.


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Organic layer:o Conducting layer - This layer is

made of organic plastic molecules thattransport "holes" from the anode. Oneconducting polymer used in OLEDs ispolyaniline.

o Emissive layer - This layer is made of

organic plastic molecules (differentones from the conducting layer) thattransport electrons from the cathode;this is where light is made. One

polymer used in the emissive layer ispolyfluorene.

Cathode (may or may not be transparent depending onthe type of OLED) - The cathode injects electrons when

a current flows through the device.


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Passive OLEDs The organic layer is between

strips of cathode and anodethat run perpendicular

The intersections form the

pixels Easy to make Use more power Best for small screens


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Active OLEDs

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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Manufacturers focusing on finding a

cheap way to produceo "Roll-to-Roll" Manufacturing

Increasing efficiency of blue luminance

Boosting overall lifespan


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TVs Cell Phone screens Computer Screens Keyboards (Optimus Maximus) Lights

Portable Divice displays


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Released XEL-1 in February2009.

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

Sony


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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, specialsymbols, HTML codes, etc... SD card slot for storing settings


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Much faster response time Consume significantly less energy Able to display "True Black" picture 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

OLED Displays Vs. LCD and Plasma


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Cheaper way to create flexiblelighting

Requires less power

Better quality of light

New design concepts for interiorlighting


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OLED Displays Vs. LCD and Plasma

Cost to manufacture is high

Overall luminance degradation Constraints with lifespan Easily damaged by water Limited market availability

OLED Lighting Vs. Incandescent and Fluorescent Not as easy as changing a light bulb


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Lighting

Flexible Wallpaper lighting defining new ways to light a space Transparent lighting doubles as a window

Cell Phones Nokia 888


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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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shashank OLED