OLEDs were first developed in the 1950s in France by applying high voltages to organic materials like acridine orange. In the 1980s, Chin Tang and Van Slyke introduced the first OLEDs made of thin organic layers. There are two main types of OLEDs - passive OLEDs which are easier to make but use more power, and active OLEDs which require less power and are suitable for large screens. OLEDs offer advantages over LCDs such as producing color without filters, using less power as they don't require backlights, and reacting faster. OLEDs are now used in televisions, phone screens, computer monitors, and other portable device displays.

2. OLED ( Organic Light – Emitting Diode )

3. • First developed in the early 1950s in France
• They applied high alternating voltages in air to materials such as
acridine orange, either deposited on or dissolved in cellulose or
cellophane thin films.
• 1960s AC-driven electroluminescent cells using doped anthracene
was developed.
• In 1987 Chin Tang and Van Slyke introduced the first light emitting
diodes from thin organic layers.
• In 1990 electroluminescence in polymers was discovered.

4. Types of OLEDs
1. Passive OLEDs : The organic layer is between strips of cathode
and anode that run perpendicular. The intersections form the
pixels. Easy to make. Use more power and are best for small
screens.
2. Active OLEDs : Full layers of cathode and anode. Anode
overlays a thin film transistor (TFT). Requires less power.
Higher refresh rates and are suitable for large screens.

5. • In some ways, OLEDs are better for display devices than LCDs. There are
also ways LCDs are better.
• OLEDs can make more different colors at different levels of brightness than
LEDs. Unlike LCDs their colors do not change when viewed at an angle.
• They are also much cheaper to make.
• Most LCDs have to have an LED used as a backlight to be visible. LCDs also
need to use filters to work properly. Because of backlighting and filtering,
OLEDs use far less power than LCDs for the amount of light made.
• OLEDs also react faster to changes in electricity. They turn on and off much
faster than LCDs.

6. .

7. • TVs
• Cell Phone screens
• Computer Screens
• Keyboards (Optimus Maximus)
• Lights
• Portable Device displays