Rollable display

Last updated

A rollable display based on organic field-effect transistor. Flexible display.jpg
A rollable display based on organic field-effect transistor.
Demonstration of a 4.1" prototype flexible display from Sony Ecran oled flexible.jpg
Demonstration of a 4.1" prototype flexible display from Sony

A rollable display, also known as a flexible display , is a type of screen that can be rolled up like a scroll without the image or text being distorted. [1] Technologies involved in building a rollable display include electronic ink, Gyricon, Organic LCD, and OLED.

Flexible display

A flexible display is an electronic visual display which is flexible in nature; as opposed to the more prevalent traditional flat screen displays used in most electronics devices. In 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.

Scroll roll of papyrus, parchment, or paper containing writing

A scroll, also known as a roll, is a roll of papyrus, parchment, or paper containing writing.

Gyricon is a type of electronic paper developed at the Xerox PARC. It has many of the same properties as paper: it is flexible, contains an image, and is viewable from a wide angle, but it can be erased and written thousands of times.


Electronic paper displays which can be rolled up have been developed by E Ink. At the CES 2006, Philips showed a rollable display prototype, with a screen capable of retaining an image for several months without electricity. As of 2007 Philips Polymer Vision expected to launch a 5-inch, 320 x 240-pixel rollable display based on E Ink’s electrophoretic technology.

Electronic paper and e-paper, also sometimes electronic ink or e-ink, are display devices that mimic the appearance of ordinary ink on paper. Unlike conventional backlit flat panel displays that emit light, electronic paper displays reflect light like paper. This may make them more comfortable to read, and provide a wider viewing angle than most light-emitting displays. The contrast ratio in electronic displays available as of 2008 approaches newspaper, and newly (2008) developed displays are slightly better. An ideal e-paper display can be read in direct sunlight without the image appearing to fade.

E Ink Corporation manufacturer of electrophoretic displays

E Ink Corporation is a subsidiary of E Ink Holdings (EIH), a Taiwanese Holding Company (8069.TWO) manufacturer of electrophoretic displays (EPDs), a kind of electronic paper. E Ink is located in Billerica, Massachusetts, and was co-founded in 1997 by undergraduates J.D. Albert & Barrett Comiskey, Joseph Jacobson, Jerome Rubin and Russ Wilcox. Two years later, E Ink partnered with Philips to develop and market the technology. Jacobson and Comiskey are listed as inventors on the original patent filed in 1996. Albert, Comiskey and Jacobsen were inducted into the National Inventors Hall of Fame in May 2016. In 2005, Philips sold the electronic paper business as well as its related patents to Prime View International (PVI).

Consumer Electronics Show electronics and technology trade show

CES is an annual trade show organized by the Consumer Technology Association (CTA). Held in January at the Las Vegas Convention Center in Las Vegas, Nevada, United States, the event typically hosts presentations of new products and technologies in the consumer electronics industry.

Some flexible organic light-emitting diode displays have been demonstrated. The first commercially sold flexible display was an electronic paper wristwatch.

Flexible organic light-emitting diode

A flexible organic light-emitting diode (FOLED) is a type of organic light-emitting diode (OLED) incorporating a flexible plastic substrate on which the electroluminescent organic semiconductor is deposited. This enables the device to be bent or rolled while still operating. Currently the focus of research in industrial and academic groups, flexible OLEDs form one method of fabricating a rollable display.

A rollable display is an important part of the development of the roll-away computer.

A roll-away computer is an idea introduced as part of a series by Toshiba in 2000, which aimed to predict the trends in personal computing five years into the future. Since its announcement, the roll-away computer has remained a theoretical device.


Rollable displays have many advantages over glass: better durability, lighter weight, thinner dimensions, and can be perfectly curved and used in many devices. [2] Moreover, the major difference between glass and rollable display is that the display area of a rollable display can be bigger than the device itself; If a flexible device measuring, for example, 5 inches in diagonal and a roll of 7.5mm, it can be stored in a device smaller than the screen itself and close to 15mm in thickness. [3]

Glass amorphous solid that exhibits a glass transition when heated towards the liquid state

Glass is a non-crystalline, amorphous solid that is often transparent and has widespread practical, technological, and decorative uses in, for example, window panes, tableware, and optoelectronics. The most familiar, and historically the oldest, types of manufactured glass are "silicate glasses" based on the chemical compound silica (silicon dioxide, or quartz), the primary constituent of sand. The term glass, in popular usage, is often used to refer only to this type of material, which is familiar from use as window glass and in glass bottles. Of the many silica-based glasses that exist, ordinary glazing and container glass is formed from a specific type called soda-lime glass, composed of approximately 75% silicon dioxide (SiO2), sodium oxide (Na2O) from sodium carbonate (Na2CO3), calcium oxide (CaO), also called lime, and several minor additives.

Display device Output device for presentation of information in visual form

A display device is an output device for presentation of information in visual or tactile form. When the input information that is supplied has an electrical signal the display is called an electronic display.

Gadget small tool such as a machine that has a function, but is often thought of as a novelty

A gadget is a small tool such as a machine that has a particular function, but is often thought of as a novelty. Gadgets are sometimes referred to as gizmos.


With the flat panel display having already been widely used more than 40 years, there have been many desired changes in the display technology, focusing on developing a lighter, thinner product that was easier to carry and store. Through the development of rollable displays in recent years, scientists and engineers agree that flexible flat panel display technology has huge market potential in the future. [4]

Rollable displays can be used in many places:

1. Mobile devices.

2. Laptops and PDAs.

3. A permanently conformed display that securely fits around the wrists. [4]

4. A child's mask for Halloween and other uses. [4]

5. An odd-shaped display integrated in a steering wheel or automobile. [4]

These are some of the many uses for flexible displays.

Samsung Youm

In January 2013, Samsung exposed its brand new, unnamed product during the company's keynote address at CES in Las Vegas. Brian Berkeley, the senior vice president of Samsung's display lab in San Jose, California had announced the development of flexible displays. He said "the technology will let the company's partners make bendable, rollable, and foldable displays," and he demonstrated how the new phone can be rollable and flexible during his speech. [5] Samsung officially released its first flexible mobile phone called "Youm". "Youm" has curved display screen, the use of OLED screen giving this phone deeper blacks and a higher overall contrast ratio with better power efficiency than traditional LCD displays. [6] Also this phone has the advantages of a rollable display; it is lighter, thinner, and more durable than LCD displays.

Samsung did not give a specific date to launch "Youm" in the market. However, Samsung stated that "Youm" panels will be seen in the market in a short time and production will commence in 2013. [7]

See also

Related Research Articles

Liquid-crystal display display that uses the light-modulating properties of liquid crystals

A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals. Liquid crystals do not emit light directly, instead using a backlight or reflector to produce images in color or monochrome. LCDs are available to display arbitrary images or fixed images with low information content, which can be displayed or hidden, such as preset words, digits, and seven-segment displays, as in a digital clock. They use the same basic technology, except that arbitrary images are made up of a large number of small pixels, while other displays have larger elements. LCDs can either be normally on (positive) or off (negative), depending on the polarizer arrangement. For example, a character positive LCD with a backlight will have black lettering on a background that is the color of the backlight, and a character negative LCD will have a black background with the letters being of the same color as the backlight. Optical filters are added to white on blue LCDs to give them their characteristic appearance.

A plasma display panel (PDP) is a type of flat panel display that uses small cells containing plasma; ionized gas that responds to electric fields.

OLED Diode which emits light from an organic compound

An organic light-emitting diode (OLED), also known as an organic EL diode, is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound that emits light in response to an electric current. This organic layer is situated between two electrodes; typically, at least one of these electrodes is transparent. OLEDs are used to create digital displays in devices such as television screens, computer monitors, portable systems such as smartphones, handheld game consoles and PDAs. A major area of research is the development of white OLED devices for use in solid-state lighting applications.

Flat-panel displays are electronic viewing technologies used to enable people to see content in a range of entertainment, consumer electronics, personal computer, and mobile devices, and many types of medical, transportation and industrial equipment. They are far lighter and thinner than traditional cathode ray tube (CRT) television sets and video displays and are usually less than 10 centimetres (3.9 in) thick. Flat-panel displays can be divided into two display device categories: volatile and static. Volatile displays require that pixels be periodically electronically refreshed to retain their state. A volatile display only shows an image when it has battery or AC mains power. Static flat-panel displays rely on materials whose color states are bistable, and as such, flat-panel displays retain the text or images on the screen even when the power is off. As of 2016, flat-panel displays have almost completely replaced old CRT displays. In many 2010-era applications, specifically small portable devices such as laptops, mobile phones, smartphones, digital cameras, camcorders, point-and-shoot cameras, and pocket video cameras, any display disadvantages of flat-panels are made up for by portability advantages.

Television set Device for viewing television broadcasts

A television set or television receiver, more commonly called a television, TV, TV set, or telly, is a device that combines a tuner, display, and loudspeakers for the purpose of viewing broadcast shows or viewing a computer's screen. Introduced in the late 1920s in mechanical form, television sets became a popular consumer product after World War II in electronic form, using cathode ray tubes. The addition of color to broadcast television after 1953 further increased the popularity of television sets in the 1960s, and an outdoor antenna became a common feature of suburban homes. The ubiquitous television set became the display device for the first recorded media in the 1970s, such as Betamax, VHS and later DVD. It has been used as a display device since the first generation of home computers and dedicated video game consoles in the 1980s. In the 2010s flat panel television incorporating liquid-crystal displays, especially LED-backlit LCDs, largely replaced cathode ray tubes and other displays. Modern flat panel TVs are typically capable of high-definition display and can also play content from a USB device.

LCD television television sets that use liquid-crystal displays to produce images

Liquid-crystal-display televisions are television sets that use liquid-crystal displays to produce images. They are, by far, the most widely produced and sold television display type. LCD TVs are thin and light, but have some disadvantages compared to other display types such as high power consumption, poorer contrast ratio, and inferior color gamut.

AMOLED display technology for use in mobile devices and televisions

AMOLED is a display device technology used in smartwatches, mobile devices, laptops, and televisions. OLED describes a specific type of thin-film-display technology in which organic compounds form the electroluminescent material, and active matrix refers to the technology behind the addressing of pixels.

Digital newspaper technology is the technology used to create or distribute a digital newspaper.

LED-backlit LCD Display technology implementation

A LED-backlit LCD is a flat panel display that uses LED backlighting instead of the cold cathode fluorescent (CCFL) backlighting. LED-backlit displays use the same TFT LCD technologies as CCFL-backlit displays, but offer reduced energy consumption, better contrast and brightness, greater color range, more rapid response to changes in scene, and photorefractive effects.

Quantum dot display display device that uses quantum dots (QD), semiconductor nanocrystals which can produce pure monochromatic red, green, and blue light.

A quantum dot display is a display device that uses quantum dots (QD), semiconductor nanocrystals which can produce pure monochromatic red, green, and blue light.

PenTile matrix is a family of patented subpixel matrix schemes used in electronic device displays. PenTile is a trademark of Samsung. PenTile matrices are used in AMOLED and LCD displays.

Time multiplexed optical shutter (TMOS) is a flat panel display technology developed, patented and commercialized by Uni-Pixel Displays, Inc. TMOS is based on the principles of total internal reflection (TIR), frustration of TIR (FTIR) and field sequential colour generation (FSC). This combination of features make it suitable for applications such as mobile phones, televisions and signalling systems.

Universal Display Corporation is a developer and manufacturer of organic light emitting diodes (OLED) technologies and materials as well as provider of services to the display and lighting industries. It is also an OLED research company. Founded in 1994, the company currently owns or has exclusive, co-exclusive or sole license rights with respect to more than 3,000 issued and pending patents worldwide for the commercialization of phosphorescent based OLEDs and also flexible, transparent and stacked OLEDs - for both display and lighting applications. Its phosphorescent OLED technologies and materials are licensed and supplied to companies such as Samsung, LG, AU Optronics CMEL, Pioneer, Panasonic Idemitsu OLED lighting and Konica Minolta.

A see-through display is an electronic display that allows the user to see what is shown on the glass screen while still being able to see through it. It is a technology that has been around for a decade or two, but only as of 2019 was it being incorporated by companies such as LG and taptl into consumer products like handheld devices, televisions, and other technology as well as building materials such as glass. All companies use OLED technology except for LG, Prodisplay, and taptl, which uses conventional LCD technology. Samsung and Planar Systems used to make transparent OLED displays but discontinued them in 2016. LG and Prodisplay are the only current manufacturers of transparent displays, Prodisplay used both OLED and LCD technology, but no longer makes transparent OLED displays. These screens can be used for augmented reality, a way of enhancing your view of the world with digital images overlaid onto real ones, and other applications such as shopping displays and more sophisticated computer screens.

Samsung Galaxy Note Edge Android phablet

The Samsung Galaxy Note Edge is an Android phablet produced by Samsung Electronics. Unveiled during a Samsung press conference at IFA Berlin on September 3, 2014 alongside its sister, the Galaxy Note 4, it is distinguished by a display that curves across the right side of the device, which can be used as a sidebar to display application shortcuts, notifications, and other information.

A foldable smartphone is a form factor of smartphone, which allows access to a larger, tablet-like display when needed by unfolding the device, whilst maintaining a similar footprint and functionality to a standard smartphone when folded. The screen may either wrap around to the back of the device when folded, or use a booklet-like design where the larger, folded screen is located on the interior, and a screen on its "cover" allows the user to interact with the device without opening it.


  1. "These flexible displays show us the future of folding tech". Gearbrain. 2018-08-31. Retrieved 2018-08-31.
  2. Drzaic, P.; Comiskey, B.; Albert, J. D.; Zhang, L.; Loxley, A.; Feeney, R.; Jacobson, J. (1 January 1998). "44.3L: A Printed and Rollable Bistable Electronic Display". SID Symposium Digest of Technical Papers. 29 (1): 1131. doi:10.1889/1.1833686.
  3. McGoldrick, Karl (2006). Solid-State Circuits Conference, 2006. ESSCIRC 2006. Proceedings of the 32nd European (PDF). Eindhoven, the Netherlands. p. 2. ISBN   1-4244-0303-0.
  4. 1 2 3 4 Crawford, edited by Gregory P. (2005). Flexible flat panel displays (Reprinted with corrections. ed.). Chichester, West Sussex, England: John Wiley & Sons. p. 2. ISBN   978-0470870488.CS1 maint: Extra text: authors list (link)
  5. Skillings, Jonathan. "Samsung shows off Youm Flexible display". CNET. Retrieved 4 April 2013.
  6. Sasaoka, Tatsuya; Sekiya, Mitsunobu; Yumoto, Akira; Yamada, Jiro; Hirano, Takashi; Iwase, Yuichi; Yamada, Takao; Ishibashi, Tadashi; Mori, Takao; Asano, Mitsuru; Tamura, Shinichiro; Urabe, Tetsuo (1 January 2001). "24.4L: Late-News Paper: A 13.0-inch AM-OLED Display with Top Emitting Structure and Adaptive Current Mode Programmed Pixel Circuit (TAC)". SID Symposium Digest of Technical Papers. 32 (1): 384. doi:10.1889/1.1831876.
  7. Lowe, Alistair. "Samsung flexible-OLED now officially trademarked as 'YOUM'". HEXUS. Retrieved 4 April 2013.