Flexible display is a display which is flexible in nature; differentiable from the more prevalent traditional flat screen displays used in most electronics devices. In the recent years there has been a growing interest from numerous consumer electronics manufacturers to apply this display technology in e-readers, mobile phones and other consumer electronics.
Flexible displays are an exciting development because of their physical and performance attributes and their capability to enable new products requiring displays with unique form factors that the current rigid glass substrate based displays cannot support. Flexible displays can be very thin, light weight, have unique form factors and be highly rugged and not prone to breakage on impact unlike rigid and flat glass substrate based displays. The flexible form factors such as having an arbitrary shape, ability to be curved, conformal, bendable, and roll-able can enable a variety of new applications and products.
NEERAJ KUMAR DAS
MCA 4th semester
SILICON INSTITUTE OF TECHNOLOGY
• Structure of OLED
• Working principle of OLED
• Flexible OLED
• Advantages of Flexible displays
• Disadvantages of Flexible displays
• Concept devices
• A flexible display is a display which is flexible in nature.
• Uses organic light emitting diode (OLED).
• Offers brighter, thinner, high contrast, flexible displays.
• Main principle behind OLED technology is electroluminescence.
• They emit 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.
STRUCTURE OF OLED
1. Cathode (-)
2. Emissive layer
3. Emission of Radiation
4. Conductive layer
5. Anode (+)
WORKING PRINCIPLE OF OLED
• A voltage is applied across the OLED such that the anode is positive with
respect to the cathode.
• Current flows from cathode to anode through the organic layers.
• Cathode gives electrons to the emissive layer.
• Anode withdraws electrons from the conductive layer, leaving electron holes.
• Holes move into emissive layer .
• Electron and hole combine and emit light.
A flexible OLED is a type of OLED
incorporating a flexible plastic
substrate on which the
semiconductor is deposited.
ADVANTAGES OF FLEXIBLE DISPLAYS
• Thinner, lighter ,flexible (uses plastic substrate instead of glass).
• Backlight not required hence consume less power.
• Large field of view about 170 degrees
• Low heat generation
• Low Power requirement
• Less prone to breakage when dropped
DISADVANTAGES OF FLEXIBLE DISPLAYS
• Lifetime - Red and green OLED films have longer lifetimes (46,000 to
230,000 hours), blue organics currently have much shorter lifetimes (up
to around 14,000 hours
• Manufacturing - Manufacturing processes are expensive right now.
• Water - Water can easily damage OLEDs. (As plastics are