E Ink

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Scheme of the E Ink technology.
Legend Item
1 Upper layer
2 Transparent electrode layer
3 Transparent micro-capsules
4 Positively charged white pigments
5 Negatively charged black pigments
6 Transparent oil
7 Electrode pixel layer
8 Bottom supporting layer
9 Light
10 White
11 Black

E Ink ("electronic ink") is a popular type of electronic paper (e-paper) display technology, characterized by a wide viewing angle and low power requirements. The technology has been commercialized by the E Ink Corporation, which was co-founded in 1997 by MIT undergraduates J.D. Albert & Barrett Comiskey, MIT Media Lab professor Joseph Jacobson, Jerome Rubin and Russ Wilcox.[1]

It is currently available commercially in grayscale and color[2] and is commonly used in mobile devices such as e-readers, and, to a lesser extent, digital signage, smartwatches, mobile phones, electronic shelf labels and architecture panels.[3]


Origins at MIT[edit]

The notion of a low-power paper-like display had existed since the 1970s, originally conceived by researchers at Xerox PARC, but had never been realized.[4] While a post-doctoral student at Stanford University, physicist Joseph Jacobson envisioned a multi-page book with content that could be changed at the push of a button and required little power to use.[5]

Neil Gershenfeld brought in Jacobson to the MIT Media Lab in 1995 after hearing his ideas for an electronic book.[4] Jacobson, in turn, recruited MIT undergrads Barrett Comiskey, a math major, and J.D. Albert, a mechanical engineering major, to create the display technology required to realize his vision.[1]

The initial approach was to create tiny spheres which were half white and half black, and which, depending on the electric charge, would rotate such that the white side or the black side would be visible on the display. Albert and Comiskey were told this approach was impossible by most experienced chemists and materials scientists and they had trouble creating these perfectly half-white, half-black spheres, and during his experiments, Albert accidentally created some all-white spheres.[1]

Comiskey experimented with charging and encapsulating those all-white particles in microcapsules mixed in with a dark dye; the result was a system of microcapsules which could be applied to a surface and then could be charged independently to create black and white images.[1] A first patent was filed for this microencapsulated electrophoretic display by MIT in October 1996.[6]

The scientific paper was featured on the cover of peer-reviewed journal Nature, unusual for work done by undergraduate students; the advantage of the microencapsulated electrophoretic display, and its potential for satisfying the practical requirements of electronic paper are summarized in the abstract of the Nature paper:

It has for many years been an ambition of researchers in display media to create a flexible low-cost system that is the electronic analogue of paper. In this context, microparticle-based displays have long intrigued researchers. Switchable contrast in such displays is achieved by the electromigration of highly scattering or absorbing microparticles (in the size range 0.1–5 μm), quite distinct from the molecular-scale properties that govern the behaviour of the more familiar liquid-crystal displays. Micro-particle-based displays possess intrinsic bistability, exhibit extremely low power d.c. field addressing and have demonstrated high contrast and reflectivity. These features, combined with a near-lambertian viewing characteristic, result in an "ink on paper" look, but such displays have to date suffered from short lifetimes and difficulty in manufacture. Here we report the synthesis of an electrophoretic ink based on the microencapsulation of an electrophoretic dispersion; the use of a microencapsulated electrophoretic medium solves the lifetime issues and permits the fabrication of a bistable electronic display solely by means of printing. This system may satisfy the practical requirements of electronic paper.[7]

A second patent was filed on the microencapsulated electrophoretic display by MIT in March 1997.[8]

Subsequently, Albert, Comiskey and Jacobson along with Russ Wilcox and Jerome Rubin founded E Ink Corporation in 1997, two months prior to Albert and Comiskey's graduation from MIT.[1]

At the E Ink Corporation, Comiskey led the development effort of E Ink's first generation of electronic ink,[9] while Albert developed the manufacturing methods used to make electronic ink displays in high volumes.[10] Wilcox played a variety of business roles and served as CEO from 2004-2009.[11]


On June 1, 2009, E Ink Corp. announced an agreement to be purchased by one of its primary business partners, Prime View Int'l Co. Ltd, for US$215 million.[12] However, from June to December 2009, the purchase price was re-negotiated and E Ink was finally officially acquired on Dec. 24, 2009 for $450 million. The purchase by this Taiwanese company has put the production of the E Ink e-paper display on a larger scale than before, as Prime View also owns BOE Hydis Technology Co. Ltd and maintains a strategic partner relationship with Chi Mei Optoelectronics Corp., which is now Chimei InnoLux Corporation, part of the Hon Hai-Foxconn Group. Foxconn is the sole ODM partner for Prime View's Netronix Inc., the supplier of E Ink panel e-readers for rebranding - the end-user products may appear with any of several brands, e.g., Bookeen, COOL-ER, PocketBook, etc.

In December 2012, E Ink acquired SiPix,[13][14] a rival electrophoretic display company.


iLiad e-book reader equipped with an e-paper display visible in the sunlight

E Ink is processed into a film for integration into electronic displays and has enabled novel applications in phones, watches, magazines, wearables and e-readers, etc.[15][16][17][18][19][20][21]

The Motorola F3 was the first mobile phone to employ E Ink technology into its display, taking advantage of the material's ultra-low power consumption. In addition, the Samsung Alias 2 uses this technology on the keypad, to allow orientation to change;[22] the October 2008 limited edition North American issue of Esquire was the first magazine cover to integrate E Ink and featured flashing text. The cover was manufactured in Shanghai, China, was shipped refrigerated to the United States for binding and was powered by a nominal 90-day integrated battery supply.[19][23]

In July 2015, the New South Wales Road and Maritime Services installed road traffic signs using E Ink in Sydney, Australia; the installed e-paper traffic signs represent the first use of E Ink in traffic signage.[24][25] Transport for London trialed E Ink displays at bus stops which offered timetables, route maps and real-time travel information to better update travel information.[26] Select Whole Foods 365 stores have employed E Ink-powered electronic shelf labels, which can be adjusted and updated remotely and can include additional information such as whether a product is gluten-free.[27] E Ink Prism was announced in January 2015 at International CES and is the internal name for E Ink’s bistable ink technology in a film that can dynamically change colors, patterns and designs with architectural products.[28]

Commercial display products[edit]

Each version/model of E Ink is marketed under different brand names, as detailed below.

E Ink Vizplex[edit]

E Ink Vizplex is the retroactive name used to refer to the first generation of the E Ink displays. Vizplex was the internal name of E Ink's display technologies, which was announced in May 2007.[29] E Ink originally used the term "Vizplex" as an umbrella term that included multiple generations of E Ink display technologies. For example, E Ink Pearl and E Ink Triton used the text "E Ink Vizplex" at the bottom of startup screens for those displays. However, as more generations were released, "Vizplex" became more often used to refer to specifically the first generation of the E Ink product line, in order to have a designation for the first generation to distinguish it from future generations.

E Ink Pearl[edit]

Macro photograph of a Kindle screen, focused just below the surface; microcapsules are clearly visible at full size

E Ink Pearl, announced in July 2010, is the second generation of E Ink Vizplex displays, a higher-contrast screen built with E Ink Pearl imaging film.[30] The updated Amazon Kindle DX was the first device announced to use the screen, and the Kindle Keyboard, Kindle 4, and Kindle Touch also incorporate the Pearl display.[20][31] Amazon still uses this display technology in the Kindle (all generations, minus the Paperwhite, Voyage, and Oasis series). Sony has also included this technology into its latest release of the Sony Reader Touch edition;[32] this display is also used in the Nook Simple Touch,[33] Kobo eReader Touch,[34] Kobo Glo, Onyx Boox M90,[35] X61S[36] and Pocketbook Touch.[37]

E Ink Mobius[edit]

E Ink Mobius (also known as E Ink Flex) is a modification of E Ink Pearl. It does not have one of the main disadvantages of the first two models of E Ink displays: a substrate made of very thin glass. E Ink Vizplex and E Ink Pearl have fragile screens which can be broken easily; the substrate of E Ink Mobius is made of flexible plastic, so it can resist small impacts and some flexing.[38] Nearly A4-sized E ink Mobius devices make up the most expensive e-readers;[39] these include Sony Digital Paper DPT-S1,[40] Pocketbook CAD Reader Flex[39] and Onyx Boox MAX.

E Ink Triton[edit]

E Ink Triton, announced in November 2010, is the third generation of E Ink Vizplex displays: a color display that is easy to read in high light. The Triton is able to display 16 shades of gray, and 4,096 colors.[41] E Ink Triton is used in commercially available products such as the Hanvon color e-reader,[42] JetBook Color made by ectaco and PocketBook Color Lux made by PocketBook.

E Ink Triton 2 is the last generation of E Ink Triton color displays. The e-readers featuring it appeared in 2013, they include Ectaco Jetbook Color 2 and Pocketbook Color Lux.[43][44]

E Ink Carta[edit]

E Ink Carta, announced in January 2013 at International CES, is the fourth generation of E Ink displays and features 768 by 1024 resolution on 6-inch displays, with 212 ppi pixel density.[45] Named Carta, it is used in the Kindle Paperwhite 1st (2012) and 2nd (2013) generations and the Pocketbook Touch Lux 3 (2015).[46]

E Ink Carta HD[edit]

E Ink Carta HD features a 1080 by 1440 resolution on a 6" screen with 300 ppi. It is used in many eReaders including the Kindle Voyage (2014), Tolino Vision (2014), Kobo Aura H2O (2014), Kindle Paperwhite 3rd and 4th generation (2015 and 2018), Kobo Glo HD (2015)[47], Nook Glowlight Plus[48] (2015), Cybook Muse Frontlight, Kindle Oasis (2016), PocketBook Touch HD[49](2016), PocketBook Touch HD 2 (2017), and the Kobo Clara HD[50] (2018).

E Ink Carta and Carta HD displays support Regal waveform technology, which reduces the need for page refreshes.[51]

E Ink Spectra[edit]

E ink Spectra is a three pigment display. The display uses microcups, each of which contains three pigments,[52] it is available for retail and electronic shelf tag labels. It is currently produced with black, white and red or black, white and yellow pigments.[53]

Advanced Color ePaper[edit]

Advanced Color ePaper (ACeP) was announced at SID Display Week in May 2016. The display contains four pigments in each microcapsule or microcup thereby eliminating the need for a color filter overlay; the pigments used are cyan, magenta, yellow and white, enabling display of a full color gamut and up to 32,000 colors.[52][53] It will be initially targeted at the in-store signage market, with 20-inch displays with a resolution of 1600 by 2500 pixels at 150 ppi.[54] An ACeP display will have a 2-second refresh rate. E Ink expects commercial production within two years of 2016.[55]

Comparison of E Ink displays[edit]

A comparison of a selection of E Ink displays as of June 2017.[56]

Name ET011TT2 ET013TT1 ET014TT1 ED035OC1 ED043WC3 ET047TC1 ED052TC2 ED060KC1 ED068TG1 ED078KC1 ES103TC1 ES133TT3 ED312TT2 ED420TT1
Size(inch) 1.1 1.3 1.43 3.5 4.3 4.7 5.2 6 6.8 7.8 10.3 13.3 31.2 42
Resolution(HxV) 240 x 240 256 x 256 296 x 128 600 x 360 800 x 480 960 x 540 960 x 540 1448 x 1072 1440 x 1080 1872 x 1404 1872 x 1404 2200 x 1650 2560 x 1440 2880 × 2160
Aspect Ratio Round 1:1 2:1 5:3 5:3 16:9 16:9 4:3 4:3 4:3 4:3 4:3 16:9 4:3
Active Area(mm) 27.96 x 27.96 23.30 x 23.30 14.46 x 33.45 45.54 x 75.90 56.16 x 93.60 58.32 x 103.68 64.53 x 114.24 90.60 x 122.40 103.68 x 138.24 118.64 x 158.18 157.25 x 209.66 270.60 x 202.95 691.20 x 388.80 642.6 x 856.8
Outline Dimensions(mm) 34.60 x 31.80 27.10 x 28.40 18.30 x 42.70 51.54 x 86.50 62.40 x 106.40 62.1 x 115.2 69.23 x 124.59 101.80 x 138.40 119.70 x 158.50 127.60 x 173.80 165.80 x 227.70 287.00 x 215.50 697.20 x 402.80 650.0 × 872.5
Dpi 218 279 225 200 216 234 213 300 260 300 226 206 94 85
E Ink Film Carta 1.2 Thin Pearl Pearl Pearl Pearl Carta 1.2 Carta 1.2 Carta 1.2 Carta 1.2 Carta 1.2 Carta 1.2 Carta 1.2 Pearl Pearl
Refresh Time 800ms 3.2 sec 800ms 450ms 450ms 480ms 480ms 450ms 450ms 450ms 450ms 450ms 980ms -
Backplane Flexible Flexible Flexible Glass Glass Flexible Glass Glass Glass Glass Flexible Flexible Glass Glass
Total Thickness 0.53mm 0.4mm 0.607mm 1.18mm 0.912mm 0.682mm 0.68mm 1.01mm 1.84mm 0.78mm 0.65mm 0.65mm 0.805mm -
Total Weight 0.72g 0.4g 0.87g 10g 12.8g 6.6g 12.3g 30g 54g 37g 32g 68g 494g 1100g
Grey Level 4 2 4 16 16 16 16 16 16 16 16 16 16 16
Front Light N N N N N N N N Y N N N N N
Surface Treatment Hard Coat Hard Coat Hard Coat Hard Coat Hard Coat Hard Coat Hard Coat Anti-glare Treatment Anti-glare Treatment Hard Coat Anti-glare Treatment Anti-glare Treatment Hard Coat Hard Coat

See also[edit]


  1. ^ a b c d e Journal, Alec Klein Staff Reporter of The Wall Street. "A New Printing Technology Sets Off a High-Stakes Race". Wall Street Journal. ISSN 0099-9660. Retrieved 2015-11-27.
  2. ^ Carmody, Tim (November 9, 2010). "How E Ink's Triton Color Displays Work, In E-Readers and Beyond". Wired.com.
  3. ^ Mobile phones
  4. ^ a b "Digital Ink by Charles Platt". archive.wired.com. Retrieved 2015-11-27.
  5. ^ "Joseph Jacobson Spotlight | National Inventors Hall of Fame". invent.org. Archived from the original on 2015-12-05. Retrieved 2015-11-27.
  6. ^ Joseph Jacobson, Barrett ComiskeyUnited States Patent: 5930026 - Nonemissive displays and piezoelectric power supplies therefor, retrieved 2015-12-01 Filed: October 25, 1996
  7. ^ Comiskey, Barrett; Albert, J. D.; Yoshizawa, Hidekazu; Jacobson, Joseph (1998-07-16). "An electrophoretic ink for all-printed reflective electronic displays". Nature. 394 (6690): 253–255. doi:10.1038/28349. ISSN 0028-0836.
  8. ^ Joseph Jacobson, Barrett Comiskey, Jonathan Albert United States Patent: 5961804 - Microencapsulated electrophoretic display, retrieved 2015-11-27 Filed: March 18, 1997
  9. ^ "The World Economic Forum Designates Technology Pioneers for 2002: Barrett Comiskey, Co-Founder of E Ink Corporation, Selected. - Free Online Library". www.thefreelibrary.com. Retrieved 2015-11-27.
  10. ^ "J.D. Albert Spotlight | National Inventors Hall of Fame". invent.org. Retrieved 2015-11-27.
  11. ^ "Russ Wilcox Steps Down at E Ink---Smart Energy Venture Next? | Xconomy". Xconomy. Retrieved 2015-11-27.
  12. ^ "E-Ink's Sale Clears Path for Color Kindle in 2010". Fast Company.
  13. ^ "E Ink Holdings - About Us". Einkgroup.com. Archived from the original on 2016-12-16. Retrieved 2013-11-08.
  14. ^ "EIH to acquire SiPix Technology". Digitimes.com. 2012-08-06. Retrieved 2013-11-08.
  15. ^ "Watches E Ink: Customer Showcase". www.eink.com. Retrieved 2015-11-27.
  16. ^ "Cell Phones E Ink". www.eink.com. Retrieved 2015-11-27.
  17. ^ "Sony Global - Press Release - First-Generation Electronic Paper Display from Philips, Sony and E Ink to Be Used in New Electronic Reading Device". www.sony.net. Retrieved 2015-11-27.
  18. ^ "Barnes & Noble Introduces nook its Wireless eBook Reader" (PDF). Press Release.
  19. ^ a b Esquire's E-Ink Cover, Esquire.com website, September 8, 2008. Retrieved 2009-08-23.
  20. ^ a b "Kindle Wireless Reading Device, Wi-Fi, Graphite, 6" Display with New E Ink Pearl Technology".
  21. ^ "Amazon Kindle Initial Press Releases". phx.corporate-ir.net. Retrieved 2015-12-01.
  22. ^ "Motofone Makes Its Global Debut Introducing Stylish Connectivity For Everyone". E Ink Corporation (Press release). Archived from the original on 12 October 2007.
  23. ^ "Esquire Becomes First Magazine To Merge Digital Technology With Printed Pages | Ford Motor Company Newsroom". Media.ford.com. 2008-07-21. Retrieved 2012-10-10.
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  26. ^ London bus stops embrace e-paper, 2015-12-22, retrieved 2017-01-05
  27. ^ "'Thoughtfully simple'". Oregon Local News. Retrieved 2017-01-05.
  28. ^ "E Ink Launches Prism, the World's First Dynamic Architecture Product Incorporating Color Changing Electronic Ink Technology | Business Wire". www.businesswire.com. Retrieved 2017-01-05.
  29. ^ Miller, Paul (2007-05-10). "E Ink Corp. announces "Vizplex" tech to speed, brighten displays". Retrieved 2012-05-11.
  30. ^ "E Ink: Technology: Display Products: E Ink Pearl Imaging Film".
  31. ^ "E Ink explains the new Pearl display used in the updated Kindle DX".
  32. ^ "Reader Touch Edition™".
  33. ^ "Nook Simple Touch Reader technical specifications".
  34. ^ "Kobo eReader Touch technical specifications".
  35. ^ "Onyx Boox M90 technical specifications".
  36. ^ "Onyx Boox X61S review (in Polish)".
  37. ^ "The PocketBook Touch model is a device for reading which combines all the best and most important characteristics of a modern reader". pocketbook-int.com.
  38. ^ "Types of displays of e-book readers". Archived from the original on 2015-03-03. Retrieved 2014-02-24.
  39. ^ a b "$574 Pocketbook CAD Reader Delayed Until Next Year, Will Have a 13.3" Mobius E-ink Screen".
  40. ^ "Sony's found the perfect use for its $1,100 Digital Paper: HR forms".
  41. ^ Triton (PDF) (press release), E ink.
  42. ^ Taub, Eric A (November 7, 2010). "Color Comes to E Ink Screens". The New York Times.
  43. ^ Kozlowski, Michael (2013), Hands on with E-Ink Triton 2 and Prototype Front Lite Technology, good ereader.
  44. ^ Kozlowski, Michael (2013), Review of the Pocketbook Color Lux eReader, Good ereader.
  45. ^ "E Ink's future foretold at CES: Next-gen will be high-res, support color", PC world (video).
  46. ^ "PocketBook Touch Lux 3 retains all flagship e-reader's traits, and has achieved an important enhancement – the latest E Ink Carta™ display with HD resolution (1024x758 pixels)". Pocketbook.
  47. ^ "Amazon unveils high-res e-ink Kindle Voyage, new Fire tablet for Kids, updated HDX". ExtremeTech. September 18, 2014.
  48. ^ Noble, Barnes &. "NOOK Gowlight vs Kindle Paperwhite". Barnes & Noble. Retrieved 2016-09-30.
  49. ^ "Pocketbook Touch HD Review". goodereader.com. July 31, 2017.
  50. ^ Store, Rakuten Kobo eReader. "Kobo Clara HD". Rakuten Kobo eReader Store. Retrieved 2018-07-15.
  51. ^ Nate Hoffelder (September 4, 2013) E-ink Announces New (4th-Gen) Screen Tech – Carta
  52. ^ a b "Technology, Electronic Ink". E Ink. Retrieved 22 February 2018.
  53. ^ a b "Technology, Color". E Ink. Retrieved 22 February 2018.
  54. ^ Diaz, Jon (2016-05-24). "E Ink Announces Advanced Color ePaper, a Breakthrough Technology for Color EPD Applications". BusinessWire. Retrieved 2016-05-24.
  55. ^ Ulanoff, Lance (2016-05-24). "The future of ultra-low-powered displays is finally in living color". Mashable. Retrieved 2016-05-24.
  56. ^ "E Ink │ Creativity on Display". www.eink.com (in Chinese). Retrieved 2017-06-12.

External links[edit]