Transcript Organic Light Emitting Diodes (OLED)

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?