Flexible display

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The unnamed concept Windows Phone 8 device from Samsung which employs a fully flexible AMOLED display.

A 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.

History[edit]

Flexible electronic paper based displays[edit]

A prototype flexible electronic paper display

Flexible electronic paper (e-paper) based displays were the first flexible displays conceptualized and prototyped. Though this form of flexible displays has a long history and were attempted by many companies, it is only recently that this technology began to see commercial implementations slated for mass production to be used in consumer electronic devices.

Xerox PARC[edit]

The concept of developing a flexible display was first put forth by Xerox PARC (Palo Alto Research Company). In 1974, Nicholas K. Sheridon, a PARC employee, made a major breakthrough in flexible display technology and produced the first flexible e-paper display. Dubbed Gyricon, this new display technology was designed to mimic the properties of paper, but married with the capacity to display dynamic digital images. Sheridon envisioned the advent of paperless offices and sought commercial applications for Gyricon.[1] In 2003 Gyricon LLC was formed as a direct subsidiary of Xerox to commercialize the electronic paper technology developed at Xerox PARC.[2] Gyricon LLC's operations were short lived and in December 2005 Xerox closed the subsidiary company in a move to focus on licensing the technology instead.[3]

HP and ASU[edit]

In 2005, Arizona State University opened a 250,000 square foot facility dedicated to flexible display research named the ASU Flexible Display Center (FDC). ASU received $43.7 million from the Army Research Lab towards the development of this research facility.[4] A planned prototype device was slated for public demonstration later that year.[5] However, the project met a series of delays. In December 2008, ASU in partnership with Hewlett Packard finally demonstrated a prototype flexible e-paper from the Flexible Display Center at the university.[6] HP continued on with the research, and in 2010, showcased another demonstration.[7] However, due to limitations in technology, HP stated “[our company] doesn't actually see these panels being used in truly flexible or rollable displays, but instead sees them being used to simply make displays thinner and lighter.”[7]

Plastic Logic[edit]

This company develops and manufactures colour and monochrome plastic flexible displays in various sizes based on its proprietary organic thin film transistor (OTFT) technology.[8][9] The displays are manufactured in the company's purpose-built factory in Dresden, Germany, which was the first factory of its kind to be built - dedicated to the high volume manufacture of organic electronics.[10] These flexible displays are cited as being "unbreakable", because they are made completely of plastic and do not contain glass. They are also lighter and thinner than glass-based displays and low-power. Applications of this flexible display technology include signage,[11][12] wristwatches and wearable devices[13] as well as automotive and mobile devices.[14]

Organic User Interfaces and the Human Media Lab[edit]

In 2004, a team lead by Prof. Roel Vertegaal at Queen's University's Human Media Lab in Canada developed PaperWindows,[15] the first prototype bendable paper computer and first Organic User Interface. Since full-colour, US Letter-sized displays were not available at the time, PaperWindows deployed a form of active projection mapping of computer windows on real paper documents that worked together as one computer through 3D tracking. At a lecture to the Gyricon and Human-Computer Interaction teams at Xerox PARC on May 4, 2007, Prof. Vertegaal publicly introduced the term Organic User Interface (OUI) as a means of describing the implications of non-flat display technologies on user interfaces of the future: paper computers, flexible form factors for computing devices, but also encompassing rigid display objects of any shape, with wrap-around, skin-like displays. The lecture was published a year later as part of a special issue on Organic User Interfaces[16] in the Communications of the ACM. In May 2010, the Human Media Lab partnered with ASU's Flexible Display Center to produce PaperPhone,[17] the first flexible smartphone with a flexible electrophoretic display. PaperPhone used bend gestures for navigating contents. Since then, the Human Media Lab has partnered with Plastic Logic and Intel to introduce the first flexible tablet PC and multi-display e-paper computer, PaperTab,[18] at CES 2013, debuting the world's first actuated flexible smartphone prototype, MorePhone[19] in April 2013.

Others[edit]

Since 2010 Sony Electronics, AU Optronics and LG Electronics have all expressed interest in developing flexible e-paper displays.[20][21] However, only LG have formally announced plans for mass production of flexible e-paper displays.[22]

Flexible OLED-based displays[edit]

Research and development into flexible e-paper-based displays largely began in late 2000s with the main intentions of implementing this technology in mobile devices. However, this technology has recently made an appearance, to a moderate extent, in consumer television displays as well.

Nokia Morph and Kinetic concepts[edit]

Nokia first conceptualized the application of flexible OLED displays in mobile phone with the Nokia Morph concept mobile phone. Released to the press in February 2008, the Morph concept was project Nokia had co-developed with the University of Cambridge.[23] WIth the Morph, Nokia intended to demonstrated their vision of future mobile devices to incorporate flexible and polymorphic designs; allowing the device to seamlessly change and match a variety of needs by the user within various environments.[24] Though the focus of the Morph was to demonstrate the potential of nanotechnology, it pioneered the concept of utilizing a flexible video display in a consumer electronics device.[24] Nokia renewed their interest in flexible mobile devices again in 2011 with the Nokia Kinetic concept.[25] Nokia unveiled the Kinetic flexible phone prototype at Nokia World 2011 in London, alongside Nokia’s new range of Windows Phone 7 devices.[26] The Kinetic proved to be a large departure from the Morph physically, but it still incorporated Nokia's vision of polymorphism in mobile devices.[25]

Sony[edit]

Demonstration of a 4.1" prototype flexible display from Sony

Sony Electronics expressed interest for research and development towards a flexible display video display since 2005.[27] In partnership with RIKEN (the Institute of Physical and Chemical Research), Sony promised to commercialize this technology in TVs and cellphones sometime around 2010.[27] In May 2010 Sony showcased a rollable TFT-driven OLED display.[28]

Samsung[edit]

In late 2010, Samsung Electronics announced the development of a prototype 4.5 inch flexible AMOLED display.[29] The prototype device was then showcased at Consumer Electronics Show 2011.[30] During the 2011 Q3 quarterly earnings call, Samung’s vice president of investor relations, Robert Yi, confirmed the company’s intentions of applying the technology in handsets and added “… we are looking to introduce [the flexible displays] sometime in 2012, hopefully the earlier part."[31] In January 2012 Samsung acquired Liquavista, a company with expertise in manufacturing flexible displays, and announced plans to begin mass production by Q2 2012.[32][33] During Samsung's CES 2013 keynote presentation, two prototype mobile devices that incorporated the flexible AMOLED display technology were shown to the public.[34]

On 8 October 2013, the Samsung Galaxy Round was unveiled as the world's first mobile phone with flexible display.[35] Featuring a 5.7" touchscreen display made of flexible material, the phone (and the screen) were curved in shape but the phone itself was solid, thus not allowing its body or the screen to be bendable. The Samsung Galaxy Round was 7.9mm thick and weighed 154 grams.[36] The smartphone ran on Android 4.3 Jelly Bean operating system and was sold for $1000 upon release.

ASU[edit]

The Flexible Display Center (FDC) at Arizona State University announced a continued effort in forwarding flexible displays in 2012.[37] On May 30, in partnership with Army Research Lab scientists, ASU announced that it has successfully manufactured the world's largest flexible OLED display using thin-film transistor (TFTs) technology.[38] ASU intends the display to be used in "thin, lightweight, bendable and highly rugged devices."[38]

Technical details[edit]

Electronic paper[edit]

Flexible displays using electronic paper technology commonly use Electrophoretic or Electrowetting technologies. However, each type of flexible electronic paper vary in specification due to different implementation techniques by different companies.

Arizona State University and HP's flexible display demonstrated in 2008 at the university's Flexible Display Center

HP and ASU e-paper[edit]

The flexible electronic paper display technology co-developed by Arizona State University and HP employs a manufacturing process developed by HP Labs called Self-Aligned Imprint Lithography (SAIL).[39] The screens are made by layering stacks of semi-conductor materials and metals between pliable plastic sheets. The stacks need to be perfectly aligned and stay that way. Alignment proves difficult during manufacturing when heat during manufacturing can deform the materials and when the resulting screen also needs to remain flexible. The SAIL process gets around this by ‘printing’ the semiconductor pattern on a fully composed substrate, so that the layers always remain in perfect alignment. The limitation of the material the screen is based on allows only a finite amount of full rolls, hence limiting its commercial application as a flexible display.[7] Specifications provided regarding the prototype display are as follows:

  • flexible and rollable up to "about half a dozen times"[7]
  • "unbreakable"[6]

AUO e-paper[edit]

The flexible electronic paper display announced by AUO is unique as it is the only solar powered variant. A separate rechargeable battery is also attached when solar charging is unavailable.[40] Specifications[20]

  • 6-inch diagonal display size
  • radius of curvature can reach 100mm
  • 9:1 high contrast ratio
  • reflectance of 33%
  • 16 gray levels
  • solar powered
  • "unbreakable"

LG e-paper[edit]

Specifications:[41]

  • 6-inch diagonal display size
  • 1024x768 (XGA) resolution
  • 4:3 aspect ratio
  • TFT based electronic display
  • "allows bending at a range of 40 degrees from the center of the screen"
  • 0.7mm thickness from the side
  • 14g weight
  • can drop from 1.5m above ground with no resultant damage
  • "unbreakable" (from tests with a small urethane hammer)

List of displays by their reported curvature[edit]

Model Diagonal (in) Radius of curvature* Curved along its wider / shorter side?
Samsung Round 5.7 7002400000000000000400 millimetres (16 in) shorter
LG G Flex 6 7002700000000000000700 millimetres (28 in) wider
Samsung KN55S9C 54.6 70034500000000000004,500 millimetres (180 in) wider
LG 55EA9800 54.6 70035000000000000005,000 millimetres (200 in) wider

*Lower is sharply curved

OLED[edit]

Many of the e-paper based flexible displays are based on OLED technology and its variants. Though this technology is relatively new in comparison with e-paper based flexible displays, implementation of OLED flexible displays saw considerable growth in the last few years.

ASU[edit]

Specifications:[42]

  • 6-inch diagonal display size
  • 480x360 HVGA resolution
  • 4:3 aspect ratio
  • OLED display technology with a TFT back plane
PaperPhone (2011) by Human Media Lab and ASU was the first flexible smartphone prototype.

Samsung[edit]

The Youm concept device from Samsung Electronics presented at CES 2013
The Samsung Youm, viewed from an angle which exaggerates the device's implementation of the flexible display technology.

Specifications:[33][43]

  • 4.5-inch diagonal display size[30]
  • 800x480 WVGA and 1280x720 WXGA resolutions[44]
  • AMOLED display technology
  • "unbreakable"

Concept devices[edit]

Mobile devices[edit]

In May 2011, Human Media Lab at Queen's University in Canada introduced PaperPhone, the first flexible smartphone, in partnership with the Arizona State University Flexible Display Center.[17] PaperPhone used 5 bend sensors to implement navigation of the user interface through bend gestures of corners and sides of the display. In January 2013, the Human Media Lab introduced the first flexible tablet PC, PaperTab,[18] in collaboration with Plastic Logic and Intel Labs, at CES. PaperTab is a multi-display environment in which each display represents a window, app or computer document. Displays are tracked in 3D to allow multidisplay operations, such as collate to enlarge the display space, or pointing with one display onto another to pull open a document file. In April 2013 in Paris, the Human Media Lab, in collaboration with Plastic Logic, unveiled the world's first actuated flexible smartphone prototype, MorePhone.[19] MorePhone actuates its body to notify users upon receiving a phone call or message.

Nokia introduced the Kinetic concept phone at Nokia World 2011 in London.[25] The flexible OLED display allows users to interact with the phone by twisting, bending, squeezing and folding in different manners across both the vertical and horizontal planes.[45] The technology journalist website Engadget described interactions such as "[when] bend the screen towards yourself, [the device] acts as a selection function, or zooms in on any pictures you're viewing."[46] Nokia envisioned this type of device to be available to consumers in "as little as three years", and claimed to already process "the technology to produce it."[25]

At CES 2013, Samsung showcased the two handsets which incorporates AMOLED flexible display technology during its keynote presentation, the Youm and an unnamed Windows Phone 8 prototype device.[47][48] The Youm possesses a static implementation of flexible AMOLED display technology, as its screen has a set curvature along one of its edges.[44] The benefit of the curvature allows users "to read text messages, stock tickers, and other notifications from the side of the device even if [the user] have a case covering the screen."[44] The screen is described to be a 16:9 aspect ratio at a 720p resolution.[44] The unnamed Windows Phone 8 prototype device is composed of a solid base from which extends a flexible AMOLED display.[48] The AMOLED display itself bends and was described as "virtually unbreakable even when dropped" according to Samsung representatives.[34] Brian Berkeley, the senior vice president of Samsung Display, believes that this flexible form factor "will really begin to change how people interact with their devices, opening up new lifestyle possibilities ... [and] allow our partners to create a whole new ecosystem of devices."[34]

Curved OLED TVs[edit]

LG Electronics and Samsung Electronics both introduced curved OLED televisions with a curved display at CES 2013 hours apart from each other.[49][50] Both companies recognized their respective curved OLED prototype television as a first-of-its-kind due to its flexed OLED display.[51][52] The technology journalist website The Verge noted the subtle curve on 55" Samsung OLED TV allowed it to have a "more panoramic, more immersive viewing experience, and actually improves viewing angles from the side."[49] The experience was also shared viewing the curved 55" LG OLED TV. It should be noted that the LG set is also 3D capable, in addition to the curvature.[50]

Model Diagonal (in) Radius of curvature (mm)*
Samsung KN55S9C 54.6 4,500[53][54][55]
LG 55EA9800 54.6 5,000[53][54][55]

*Lower is sharply curved

See also[edit]

References[edit]

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External links[edit]