Electronic Devices
and Circuits
2019

• OLED (Organic Light Emitting Diodes) is a flat
light emitting technology, made by placing a
series of organic thin films between two
conductors. When electrical current is applied, a
bright light is emitted. OLEDs are emissive
display that do not require a backlight and so
are thinner and more efficient than LCD
displays (which do require a white backlight).
• OLED displays are not just thin and efficient -
they provide the best image quality ever and
they can also be made transparent , flexible,
foldable and even roll able and stretchable in
the future. OLEDs represent the future of
display technology!
• OLEDs are organic because they are made from
carbon and hydrogen. There's no connection to
organic food or farming 2

• OLED panels are made from organic
materials that emit light when electricity is
applied through them. Since OLEDs do not
require a backlight and filters (like LCD
displays do), they are more efficient, simpler
to make, and much thinner - and in fact can
be made flexible and even roll able.
• The main component in an OLED display is
the OLED emitter - an organic (carbon-
based) material that emits light when
electricity is applied. The basic structure of
an OLED is an emissive layer sandwiched
between a cathode (which injects electrons)
and an anode (which removes electrons). 3

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• These terms relate to the driving method of
the OLED display. A PMOLED (Passive-
Matrix OLED) is limited in size and resolution
(usually maximum resolution is around
128x128), but is cheaper and easier to make
compared to an AMOLED (which uses an
Active-Matrix). An AMOLED uses an active-
matrix TFT array and storage capacitors.
While these displays are more efficient and
can be made large, they are also more
complicated to make.
• PMOLED displays are used in small devices or
secondary displays while AMOLEDs are used
in smartphones, tablets and TVs. Here's more
information about the difference between
PMOLED and AMOLED.

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• The leading AMOLED producer today is
Samsung, who's making over 400 million
displays a year, mostly smartphone-sized
AMOLEDs (flexible and rigid). LG Display is the
world's leading (and only) OLED TV panel
maker, and LG is also starting now to produce
small-sized flexible OLEDs.
• OLED Opens Up the possibility to create
- Foldable Displays
- Rollable Displays
- Stretchable Displays
- Transparent OLEDs embedded in windows etc.
- And many more we cannot even imagine
today…

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