WELCOME

OLEDORGANIC LIGHT EMITTING DIODE

AKHIL KS2 MCA

Sree Narayana Institute of Technology

KOLLAM

INTRODUCTION

Definition

An organic light emitting diode (OLED) is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compounds that emits light when an electric current passes through it.

ARCHITECTURE OF OLEDS• 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. • Organic layer:

Conducting layer - This layer is made of organic plastic molecules that transport "holes" from the anode. One conducting polymer used in OLEDs is polyaniline.

Emissive layer - This layer is made of organic plastic molecules (different ones from the conducting layer) that transport electrons from the cathode; this is where light is made. One polymer used in the emissive layer is polyfluorene.

 

• Cathode (may or may not be transparent depending on the type of OLED) - The cathode injects electrons when a current flows through the device.

TYPES OF OLED[A] Classification according to Transparency

1. Bottom or top emissive OLEDs:

• One of the electrode is kept transparent

TYPES OF OLED[A] Classification according to Transparency

2. Transparent OLEDs:

• Both electrodes are kept transparent

TYPES OF OLED[B] FOLDABLE OLED

• Flexible substrate is used

• It is prepared by roll-to-roll patterning method

TYPES OF OLED[C] CLASSIFICATION ACCORDING TO PIXEL FORMATION

USED

1. Active Matrix OLEDs (AM-OLEDs):

• Display is a set of pixel

• Pixel is a single oled

• Individual Cathode and Anode

• Requires less power

• Suitable for large screens

TYPES OF OLED[C] CLASSIFICATION ACCORDING TO PIXEL FORMATION

USED

2. Passive Matrix OLEDs (PM-OLEDs):

• Cathode and Anode are kept common for each rows/columns

• Pixel formed at the intersection

• Use more power

• Easy to make

APPLICATIONS OF OLEDS

• TVs• Cell Phone screens • Computer Screens• Keyboards (Optimus Maximus)• Lights• Portable Divice displays

APPLICATIONS OF OLEDS

• OLEDs as a Light Source

APPLICATIONS OF OLEDS

• OLED Televisions

• 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

APPLICATIONS OF OLEDS

• 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

ADVANTAGES OF OLEDS

OLED Displays Vs. LCD and Plasma

• Very thin panel of approximately 1mm• Low power consumption• High brightness• Wide viewing angle of 170• No environmental drawbacks• Foldable display panel• Much faster response time • Better contrast ratio

ADVANTAGES OF OLEDS

• Cheaper way to create flexible lighting• Requires less power • Better quality of light (ie. no "Cold Light")• New design concepts for interior lighting

OLED Lighting Vs. Incandescent and Fluorescent

DISADVANTAGES OF OLEDS

• Cost to manufacture is high• Easily damaged by water• Limited market availability

OLED Displays Vs. LCD and Plasma

OLED Lighting Vs. Incandescent and Fluorescent 

• Not as easy as changing a light bulb 

FUTURE USES FOR OLED

Lighting• Flexible / bendable lighting• Wallpaper lighting defining new ways to light a

space• Transparent lighting doubles as a window

FUTURE USES FOR OLED

Scroll Laptop

• Nokia concept OLED Laptop

CONCLUSION

OLED is a display device that sandwiches carbon based films between the two electrodes and when voltage is applied creates light

SMOLED’s & LEP’s are its technology branches

Chemical modifications to the structure can tune the emission over the entire visible region.

Multilayer devices and dopants also play a role in tuning emission

Thank you!