Post on 14-Feb-2017
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Dept: Electronics And Telecommunication
3rd Year
Gramin Polytechnic Vishnupuri Nanded
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Paper Presentation On
Technological Advancements In TV
Submitted By: Hashmi Mehrose
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History of OLEDs
• First developed in the early 1950s in France• Early technology would emmite a short burst of light when a
voltage was applied• This early form applied high-voltage alternating current field to
crystalline thin films of acridine orange and quinacrine. • In 1987 Chin Tang and Van Slyke
introduced the first light emitting diodes from thin organic layers.
• In 1990 electroluminescence in polymers was discovered.
History
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Architecture of OLEDs
-The substrate supports the OLED.-Organic layers-made of organic molecules-Organic layers are sandwiched between cathode and anode layer.
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Types of OLEDs:
1. Pmoled2. Amoled3. Top-
emitting4. Foldable5. White6. Transparent
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PMOLED
• Cathode and anode strips• Perpendicular• Intersections make pixel• Process controll by external cktry.• Easy to make• Consumed more power than other oled technology
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2. Active-Matrix OLED (AMOLED)
Full layers of cathode, anode, organic molecules
Thin Film Transistor matrix (TFT) on top of anode Internal circuitry to
determine which pixels to turn on/off
Less power consumed then PMOLED Used for larger displays
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3. Transparent OLEDTOLED
Transparent substrate, cathode and anode
Bi-direction light emission
Passive or Active Matrix OLED
Useful for heads-up display Transparent projector
screen glasses
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4. Top-emitting OLEDTEOLED
Non-transparent or reflective substrate
Transparent Cathode Used with Active
Matrix Device Smart card displays
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5. Foldable OLED Flexable metalic
foil or plastic substrate
Lightweight and durable
Reduce display breaking
Clothing OLED
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6. White OLED Emits bright white
light Replace
fluorescent lights Reduce energy
cost for lighting True Color Qualities