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Download Organic Light Emitting Diodes (OLED)
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ORGANIC LIGHT EMITTING DIODES (OLED) By Paul Naud EE230 Fall 2011 Instructor: Claire Gu WHAT IS AN OLED? An OLED is a LED that uses the electroluminescence of organic material to emit light instead of physical characteristics of compounds like GaAs. This allows for flexibility and high resolutions BASIC DESIGN Cathode Anode BASIC DESIGN Cathode Emissive Layer Conductive Layer Anode BASIC DESIGN Cathode Emissive Layer Conductive Layer Anode Substrate TYPES OF OLED PASSIVE MATRIX OLED (PMOLED) Controls each individual row of a display sequentially Pixels remain off for most of the time Higher voltage required for operation ACTIVE MATRIX OLED (AMOLED) Controls each individual row of a display sequentially Uses a Thin-Film Transistors (TFT) array for pre-charging and constant voltage. THIN FILM TRANSISTORS Special Field Effect Transistor (FET) that is developed on glass Used in display technologies TRANSPARENT OLED All components are transparent 85% as transparent as the substrate Uses either Passive or Active Matrix OLEDs ADVANTAGES TO OLED Lightweight Flexibility Wider Viewing Angles Power Efficiency Future Manufacturing DISADVANTAGES TO OLED Lifespan Current Manufacturing Color Degradation Outdoor Performance White Light Water damages organic materials Approximately 3x more power used then LCDs Screen Burn-In Permanent discoloration of areas caused by nonuniform use of pixels INTERESTING DEVELOPMENTS IN OLED TECHNOLOGIES EDAG Light Car Smart Windshield Heads-up Displays Military Applications QUESTIONS?
