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OLED DISPLAY TECHNOLOGY
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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!