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FOLDABLE
ELECTRONIC DISPLAYS
Presentation by-
MOHD TAHIR
FLEXIBLE OLEDS: INTRODUCTION AND
MARKET STATUS
 OLED is an emerging display technology that enables beautiful and
efficient displays and lighting panels. OLEDs are already being used in
many mobile devices and TVs, and the next generation of these
panels will be flexible and bendable.
DIFFERENT KINDS OF FLEXIBILITY
 When we talk about flexible OLEDs, it's important to understand what that means
exactly. A flexible OLED is based on a flexible substrate which can be either plastic, metal
or flexible glass. The plastic and metal panels will be light, thin and very durable - in fact
they will be virtually shatter-proof.
 The first range of devices that use flexible OLED displays are not really flexible from the
user perspective. The device maker bends the displays, or curves it - but the final user is
not able to actually bend the device. Besides the beautiful designs, a flexible OLED has
several advantages especially in mobile devices - the displays are lighter, thinner and
more durable compared to glass based displays.
 Second generation flexible OLED devices may indeed be flexible to the final user. Finally,
when the technology is ready, we may see OLED panels that you can fold, bend or
stretch. This may create all sorts of exciting designs that will enable large displays to be
placed in a mobile device and only be opened when required.

FLEXIBLE OLED PRODUCTS
 In October 2013, following many years of development and prototype
demonstrations, both Samsung and LG Display finally started
producing flexible AMOLED displays on plastic (polyimide) substrates.
Both Korean companies are now mass producing such displays, which
are being used in mobile phones and wearable devices - such as
the Galaxy S7 Edge (shown below), the LG G Flex 2 and Apple's Watch.
BENDABLE DOES NOT MEAN CURVED
 Although curved screens are impressive, these are not the same as the ones that are bent.
Traditionally, liquid-crystal displays (LCDs) are sandwiches with materials that include backlight,
polariser, thin-film transistor, liquid crystals and filter glass. LCDs are usually flat, but several
companies like Samsung have managed to produce curved LCDs.
 The recently released organic LED ecosystem (OLED) has gained popularity, thanks to its simplified
design, better image quality and flexibility. OLED displays do not require backlighting, so these can be
thinned and moulded into specific shapes such as the curved display on Samsung Galaxy S7. Flexibility,
thinness and excellent image quality make OLED a better choice for curved screens, and it is clear that
the OLED will overthrow LCD TVs in the future. However, OLEDs are currently too expensive to
produce for large screens such as televisions and computer monitors, but their prices will eventually
fall.
 Although LCDs contain more layers than OLEDs, these screens may still be bent. Apple Japan Display is
developing a 14cm (5.5-inch), full HD LCD. The display will use plastic for the substrate, which has
traditionally been made of non-removable glass. This will enable it to flex and bend.
 However, engineers need to come up with a way to create materials that will not break down under
repeated bending stress, keeping a consistent image on the screen. This is a huge challenge.
DURABILITY IS A HUGE PLUS POINT IN
FLEXIBLE DISPLAYS
 The biggest advantage of flexible displays is durability. Because the
screen can be bent and manipulated, it can also absorb impact better
than solid glass structures we currently have. So broken screens can be
a thing of the past. However, it will take some time before we reach
that point. It is assumed today that bendable screens will use plastic
instead of glass, but the plastic itself can still crack under extreme
stress.
 Manufacturers like Corning are currently working on a flexible glass
called Willow, which is planned to be put into everything from
telephones to televisions to carry devices. Willow is as thin as a piece of
paper and can be bent too. But it will still break if it gets too much
rounded up.
SAMSUNG, LG AND APPLE JOIN THE MOVE
 The three largest mobile manufacturers are reportedly experimenting
with flexible displays. According to Samsung, the most important
feature of Galaxy X is that its display can be folded outside, allowing
users to convert their phones into 12.7cm (7-inch) tablets. LG is also
said to have come out with a smartphone that folds outside to form a
tablet. Patent drawings represent a conceptual LG phone that has a
foldable display which can be used even after bending. Apple is
considering the use of bendable displays on the iPhone in 2018.
POTENTIAL APPLICATIONS
 flexible displays could be used as clothing that changes colour or pattern instantly
as per the environment, making these particularly useful for soldiers.
 Phones can also take a new format, similar to the Lenovo Cplus prototype, which
starts as a thin handset but folds into a wristband. Samsung experimented with the
introduction of curved displays on its original Galaxy Gear S smartphone, but moved
to a more traditional flat, rounded Galaxy Gear S3. With curved displays, intelligent
observers can theoretically have massive screens that surround their wrist to display
even more information at once.
Cars could also use curved screens as more and more dashboards are going digital.
For example, Mercedes E-Class displays infotainment indicators and infotainment
data on a 31cm (12.3-inch) HD display that extends on the dashboard. Tesla and X
models have a huge 43cm (17-inch) central display, but you can use a curved screen
to make the outline look natural on the car’s dashboard.
THE BIGGEST CHALLENGES
 The concept of bent displays is not new, because gadget manufacturers
appear to be displaying them on large shows like CES (Consumers
Electronics Show in Las Vegas, USA) and MWC (Mobile World Congress
in Barcelona, Spain) annually, but no one has brought a flexible display
to the market yet. Why?

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  • 2. FLEXIBLE OLEDS: INTRODUCTION AND MARKET STATUS  OLED is an emerging display technology that enables beautiful and efficient displays and lighting panels. OLEDs are already being used in many mobile devices and TVs, and the next generation of these panels will be flexible and bendable.
  • 3. DIFFERENT KINDS OF FLEXIBILITY  When we talk about flexible OLEDs, it's important to understand what that means exactly. A flexible OLED is based on a flexible substrate which can be either plastic, metal or flexible glass. The plastic and metal panels will be light, thin and very durable - in fact they will be virtually shatter-proof.  The first range of devices that use flexible OLED displays are not really flexible from the user perspective. The device maker bends the displays, or curves it - but the final user is not able to actually bend the device. Besides the beautiful designs, a flexible OLED has several advantages especially in mobile devices - the displays are lighter, thinner and more durable compared to glass based displays.  Second generation flexible OLED devices may indeed be flexible to the final user. Finally, when the technology is ready, we may see OLED panels that you can fold, bend or stretch. This may create all sorts of exciting designs that will enable large displays to be placed in a mobile device and only be opened when required. 
  • 4. FLEXIBLE OLED PRODUCTS  In October 2013, following many years of development and prototype demonstrations, both Samsung and LG Display finally started producing flexible AMOLED displays on plastic (polyimide) substrates. Both Korean companies are now mass producing such displays, which are being used in mobile phones and wearable devices - such as the Galaxy S7 Edge (shown below), the LG G Flex 2 and Apple's Watch.
  • 5. BENDABLE DOES NOT MEAN CURVED  Although curved screens are impressive, these are not the same as the ones that are bent. Traditionally, liquid-crystal displays (LCDs) are sandwiches with materials that include backlight, polariser, thin-film transistor, liquid crystals and filter glass. LCDs are usually flat, but several companies like Samsung have managed to produce curved LCDs.  The recently released organic LED ecosystem (OLED) has gained popularity, thanks to its simplified design, better image quality and flexibility. OLED displays do not require backlighting, so these can be thinned and moulded into specific shapes such as the curved display on Samsung Galaxy S7. Flexibility, thinness and excellent image quality make OLED a better choice for curved screens, and it is clear that the OLED will overthrow LCD TVs in the future. However, OLEDs are currently too expensive to produce for large screens such as televisions and computer monitors, but their prices will eventually fall.  Although LCDs contain more layers than OLEDs, these screens may still be bent. Apple Japan Display is developing a 14cm (5.5-inch), full HD LCD. The display will use plastic for the substrate, which has traditionally been made of non-removable glass. This will enable it to flex and bend.  However, engineers need to come up with a way to create materials that will not break down under repeated bending stress, keeping a consistent image on the screen. This is a huge challenge.
  • 6. DURABILITY IS A HUGE PLUS POINT IN FLEXIBLE DISPLAYS  The biggest advantage of flexible displays is durability. Because the screen can be bent and manipulated, it can also absorb impact better than solid glass structures we currently have. So broken screens can be a thing of the past. However, it will take some time before we reach that point. It is assumed today that bendable screens will use plastic instead of glass, but the plastic itself can still crack under extreme stress.  Manufacturers like Corning are currently working on a flexible glass called Willow, which is planned to be put into everything from telephones to televisions to carry devices. Willow is as thin as a piece of paper and can be bent too. But it will still break if it gets too much rounded up.
  • 7. SAMSUNG, LG AND APPLE JOIN THE MOVE  The three largest mobile manufacturers are reportedly experimenting with flexible displays. According to Samsung, the most important feature of Galaxy X is that its display can be folded outside, allowing users to convert their phones into 12.7cm (7-inch) tablets. LG is also said to have come out with a smartphone that folds outside to form a tablet. Patent drawings represent a conceptual LG phone that has a foldable display which can be used even after bending. Apple is considering the use of bendable displays on the iPhone in 2018.
  • 8. POTENTIAL APPLICATIONS  flexible displays could be used as clothing that changes colour or pattern instantly as per the environment, making these particularly useful for soldiers.  Phones can also take a new format, similar to the Lenovo Cplus prototype, which starts as a thin handset but folds into a wristband. Samsung experimented with the introduction of curved displays on its original Galaxy Gear S smartphone, but moved to a more traditional flat, rounded Galaxy Gear S3. With curved displays, intelligent observers can theoretically have massive screens that surround their wrist to display even more information at once. Cars could also use curved screens as more and more dashboards are going digital. For example, Mercedes E-Class displays infotainment indicators and infotainment data on a 31cm (12.3-inch) HD display that extends on the dashboard. Tesla and X models have a huge 43cm (17-inch) central display, but you can use a curved screen to make the outline look natural on the car’s dashboard.
  • 9. THE BIGGEST CHALLENGES  The concept of bent displays is not new, because gadget manufacturers appear to be displaying them on large shows like CES (Consumers Electronics Show in Las Vegas, USA) and MWC (Mobile World Congress in Barcelona, Spain) annually, but no one has brought a flexible display to the market yet. Why?