DEPARTMENT OF ELECTRONICS & COMMUNICATION
PRESENTATION ON OLED TECHNOLOGY
UNDER THE GUIDANCE OF
Dr. K. ANUSUDHA,
Dept. Of Electronics Engineering
M.Tech (ECE) – Ist Yr
WHAT IS AN OLED?
STRUCTURE OF OLED(Figure)
TYPES OF OLED
• Uses Organic Light Emitting Diode(OLED).
• Emerging Technology for displays in devices.
• Main principle behind OLED technology is electroluminescence.
• Offers brighter, thinner, high contrast, flexible displays.
WHAT IS AN OLED?
• OLEDs are solid state devices composed of thin films of
organic molecules that is 100 to 500 nanometres thick.
• They emits light with the application of electricity.
• They doesn’t require any backlight i.e., they are self emitting.
• They are made from carbon and hydrogen.
• The first OLED devices was developed by Eastman Kodak in
• In 1996, pioneer produces the world’s first commercial
• In 2000, many companies like Motorola, LG etc developed
• In 2001, sony developed world’s largest fullcolor OLED.
• In 2002, approximately 3.5 million passive matrix OLED sub-
displays were sold, and over 10 million were sold in 2003.
• In 2010 and 2011, many companies announced AMOLED
• Many developments had take place in the year 2012.
• Emissive Technology.
• Light weight and thin.
• Low power consumption.
• High contrast, brighter and perfect display from all angles.
• Substrate preparation.
• Device deposition
Deposit and pattern anode.
Pattern organic layers.
Vacuum deposit and pattern cathode.
• Also involves making backplane.
• Organic layers can be applied to the substrate using the
- Evaporation and shadow masking.
- Inkjet printing.
- Organic vapor phase deposition.
• Different approaches for fabricating red, green and blue
- Red, green and blue individual pixels.
- White emitter and color filters.
- Blue emitter and color converters.
- Stacked OLED
• A voltage is applied across the anode and cathode.
• Current flows from cathode to anode through the organic
• Electrons are removed from conductive layer leaving holes.
• Holes jump into emissive layer.
• Electron and hole combine and light emitted.
TYPES OF OLED
Six types of OLEDs
1. Passive matrix OLED (PMOLED).
2. Active matrix OLED (AMOLED).
3. Transparent OLED (TOLED).
4. Top emitting OLED.
5. Flexible OLED (FOLED).
6. White OLED (WOLED).
• Thinner, lighter and more flexible.
• Do not require backlighting like LCDs.
• Can be made to larger sizes.
• Large fields of view, about 170 degrees.
• Faster response time.
• High resolution, <5𝜇𝑚 𝑝𝑖𝑥𝑒𝑙 𝑠𝑖𝑧𝑒.
• Low Lifespan.
• Water damage.
• Color balance issues.
Major applications of OLED technology are
Mobile phones with OLED screens.
• Organic Light Emitting Diodes are evolving as the next
• As OLED display technology matures, it will be better able to
improve upon certain existing limitations of LCD including
High power consumption.
Limited viewing angles.
Poor contrast ratios.
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