Hh

1. CO-ORDINATOR
NOOR FATHIMA
Ast.prof. Dept of ECE
GOVERNMENT ENGINEERING COLLEGE
RAMANAGARA
OLED DISPLAY
PRESENTED BY:-
THRIVENI M
(1GG19EC040)
Submitted for the partial fulfillment
of
BACHELOR OF ENGINEERING
IN
ELECTRONICS AND COMMUNICATION ENGINEERING
DEPT OF ECE, GEC Ramanagara
TECHNICAL SEMINAR

2. CONTENTS
INTRODUCTION
HISTORY
OLED VS LED
STRUCTURE OF OLED
TYPES OF OLED
ADVANTAGE AND DISADVANTAGE
CONCLUSION

3.  ORGANIC LIGHT EMITTING DIODE
 An OLED is a solid state device consisting of thin carbon beased semiconductor layer that emits light
 They are made of carbon and hydrogen
 These molecules are 100 to 500 nano meters thick
 Image is produced by the combination of basic color RGB

4. HISTORY
 OLED Was first developed in 1950 in France
 In 1960 AC driven electroluminescent cells using dopeing was developed
 In 1990 electroluminescent polymers was discovered
 In 2001 sony developed worlds largest fullcolour OLED

5. OLED VS LED

6. LED OLED
As we can see the TV at left is more vibrant and the blacks are more
dard compared to the TV at right

7. • When the video is zoomed we can observe that the video is combination of pixels
• The variation of pixel colors make a video

8. • Each pixel is 0.3 mm
• By changing the pixel density the color will change and this used a LED light in the
background

9. • Back light
• Diffuser
• LCD sheet
• Color Filter
• Glass
A perfect black color is not
achieved due to the use of back
light to overall display

11. OLED In oled each pixel is
individually powered so
while representing black
color we can get a
perfect black
Any color can be produced
by RGB

12. OLED

13. In OLED each pixels has a separate light source

14. As shown when each pixel is
powered they produce a
different color by combining
basic color RGB
• Each pixel has its own position and colour
data
• While reconstruction of image the data is
converted into electrical signal to produce
color

15. STRUCTURE OF OLED

16. An OLED consists of the following parts:
Substrate (clear plastic, glass, foil) - The substrate supports the OLED.
Anode (transparent) - The anode removes electrons (adds electron "holes") when a current flows
through the device.
Organic layers - These layers are made of organic molecules or polymers.
Conducting layer - This layer is made of organic plastic molecules that transport "holes" from the anode.
Emissive layer - This layer is made of organic plastic molecules (different ones from the conducting
layer) that transport electrons from the cathode
Cathode (may or may not be transparent depending on the type of OLED) - The cathode injects electrons
when a current flows through the device.

17. TYPES OF OLED
Passive-matrix OLED (PMOLED)
• Used in cell phones
• They are easy to make
• They produce image where light is active
Active-matrix OLED (AMOLED)
• This consumes less power than PMOLED
• This have faster refresh rate
• Used in larger screens higher end mobiles
PASSIVE – ACTIVE matrix OLED

18. Transparent OLED
Transparent OLEDs have only transparent components
(substrate, cathode and anode) and, when turned off, are up to
85 percent as transparent as their substrate.
Used in heads-up displays in Car
Foldable OLED
Foldable OLEDs have substrates made of very
flexible metallic foils or plastics. Foldable OLEDs
are very lightweight and durable.

19. ADVANTAGES OF OLED
• Thinner, lighter and more flexible than the
crystalline layers in an LED or LCD.
• OLEDs are brighter than LEDs
• OLEDs are easier to produce and can be made to
larger sizes.
• OLEDs have large fields of view, about 170
degrees
• Higher Resolution

20. DISADVANTAGES OF OLED
• Life span
• Expensive
• Water damage

21. CONCLUSION
• OLEDS have many applications such as OLED TV mobile phones with OLED
screen
• They are evolving as the next generation displays
• These OLEDS can overcome limitations of LED
• OLEDS can be used in future cars

22. THANK YOU