Patents Assigned to E Ink Corporation
  • Patent number: 12276894
    Abstract: The present invention is directed to a sealing layer that comprises a poly(vinyl alcohol) homopolymer or a poly(vinyl alcohol-co-ethylene) copolymer, a polyurethane, and a conductive filler. The sealing layer shows good barrier properties to a non-polar fluid. The sealing layer can be used to seal microcells of electro-optic devices, contributing to improved good electro-optic performance of the device, especially at low temperatures.
    Type: Grant
    Filed: February 2, 2022
    Date of Patent: April 15, 2025
    Assignee: E Ink Corporation
    Inventors: Ali Sarvi, Abraham Berhane, Mary E. Parent, Kenneth R. Crounse, Stephen J. Telfer
  • Patent number: 12272324
    Abstract: Waveforms for driving an electrophoretic display including a color filter between a viewer and the electrophoretic medium. Because the waveform results in each image update visiting the white state before the final state, the overall gamut is larger in aggregate and more predictable than simply driving the electrophoretic display including a color filter with the waveforms that are used for black and white grayscale displays.
    Type: Grant
    Filed: February 26, 2024
    Date of Patent: April 8, 2025
    Assignee: E Ink Corporation
    Inventor: Sarah Paydavosi
  • Patent number: 12259629
    Abstract: An electrophoretic display includes an electrophoretic medium having a non-polar fluid and two sets of charged pigment particles dispersed in the non-polar fluid and movable through the non-polar fluid under influence of an electric field. The two sets of charged pigment particles have different optical characteristics from each other. The display also includes a light-transmissive electrode on one side of the electrophoretic medium, a rear electrode on an opposite side of the electrophoretic medium, and a dielectric layer having a dielectric constant greater than 5 between the electrophoretic medium and the light-transmissive electrode or between the electrophoretic medium and the rear electrode configured to reduce electrode electrochemical degradation and buildup of remnant voltages in the display.
    Type: Grant
    Filed: April 27, 2023
    Date of Patent: March 25, 2025
    Assignee: E Ink Corporation
    Inventors: Cristina Visani, Stephen J. Telfer, Kosta Ladavac, Kenneth R. Crounse, Timothy J. O'Malley, Teck Ping Sim
  • Patent number: 12253784
    Abstract: A driving method for driving a display comprising an electrophoretic material having at least one type of colored pigment particle, the method includes applying at least one pulse pair to reset the at least one type of colored pigment particle, applying a separation pulse, and applying a second pulse pair to reset the at least one type of colored pigment particle.
    Type: Grant
    Filed: September 12, 2023
    Date of Patent: March 18, 2025
    Assignee: E Ink Corporation
    Inventor: Craig Lin
  • Patent number: 12250892
    Abstract: Provided herein is a phase change material for use in a display device. Also provided is a display device comprising a phase change material; the use of a phase change material as an optical absorber in a display device; a method of fabricating a pixel; and a method of fabricating a display device. The phase change material is as described in more detail herein.
    Type: Grant
    Filed: May 30, 2024
    Date of Patent: March 11, 2025
    Assignee: E Ink Corporation
    Inventors: Peiman Hosseini, Clement Talagrand, Graham Triggs, Christopher Wright, Noboru Yamada
  • Patent number: 12248226
    Abstract: A variable light transmission device has at least one layer of electrophoretic medium comprising charged particles. Application of a an electric field having a waveform formed by a superposition of a carrier and a modulator waveform enables the switching of the device from a closed state to an open state, wherein the open state has higher light transmission than the closed state. As a result, the device enables the selection of the desired optical state by the user.
    Type: Grant
    Filed: January 17, 2023
    Date of Patent: March 11, 2025
    Assignee: E Ink Corporation
    Inventors: Kosta Ladavac, Richard J. Paolini, Jr., Stephen J. Telfer, Lee Yezek, Sunil Krishna Sainis, Peter Carsten Bailey Widger
  • Patent number: 12249291
    Abstract: Methods for driving color electrophoretic displays including a plurality of display pixels capable of producing a set of primary colors. The method comprises defining a separation cumulate threshold array and using the separation cumulate threshold array to identify areas of the electrophoretic display that are better suited for dithering and not dithering the areas of the electrophoretic display that exceed the separation cumulate threshold.
    Type: Grant
    Filed: November 27, 2023
    Date of Patent: March 11, 2025
    Assignee: E Ink Corporation
    Inventor: Kenneth R. Crounse
  • Patent number: 12249262
    Abstract: A method for driving electro-optic displays including electro-optic material disposed between a common electrode and a backplane. The backplane includes an array of pixel electrodes, each coupled to a transistor. A display controller applies waveforms to the pixel electrodes. The method includes applying first measurement waveforms to a first portion of the pixel electrodes. During each frame of the first measurement waveforms, the same time-dependent voltages are applied to each pixel electrode of the first portion of pixel electrodes. The method includes determining the impedance of the electro-optic material in proximity to the first portion of pixel electrodes based on a measurement of the current flowing through a current measurement circuit and the time-dependent voltages applied to each pixel electrode during the first measurement waveforms, and selecting driving waveforms based on the impedance of the electro-optic material in proximity to the first portion of pixel electrodes.
    Type: Grant
    Filed: June 30, 2023
    Date of Patent: March 11, 2025
    Assignee: E Ink Corporation
    Inventors: Karl Raymond Amundson, Teck Ping Sim, Michael D. McCreary, Yi Lu
  • Patent number: 12249290
    Abstract: There are provided display controllers and driving methods related to those described in US Published Patent Application No. 2013/0194250.
    Type: Grant
    Filed: November 27, 2023
    Date of Patent: March 11, 2025
    Assignee: E Ink Corporation
    Inventors: Pierre-Yves Emelie, Kenneth R. Crounse, Karl Raymond Amundson
  • Patent number: 12243498
    Abstract: An electrophoretic display comprising a fluid including a first species of particles and a charge control agent disposed between first and second electrodes. When a first addressing impulse have an electrical polarity is applied to the medium, the first species of particles move in one direction relative to the electric field, but when a second addressing impulse, larger than the first addressing impulse but having the same electrical polarity, is applied to the medium, the first species of particles move in the opposed direction relative to the electric field.
    Type: Grant
    Filed: March 25, 2021
    Date of Patent: March 4, 2025
    Assignee: E Ink Corporation
    Inventors: Stephen J. Telfer, Stephen Bull, Alain Bouchard, Craig A. Herb, Kosta Ladavac, Ana L. Lattes, Jennifer M. Morrison, Richard J. Paolini, Jr., Michael Thomas Regan, Luke M. Slominski, Lee Yezek, Kenneth R. Crounse, J. Ryan Kruse, Christopher L. Hoogeboom, Jason D. Feick, David D. Miller
  • Patent number: 12195586
    Abstract: Mixtures are disclosed containing a plurality of charged pigment particles and a one or more charge control agents. At least one of the charge control agents has a chemical structure that includes a cationic head group, such as an ammonium cation or an iminium compound, and a non-ionic, polar functional group, other than an acyclic secondary amide group. The mixtures are useful as dispersions for forming electrophoretic media that may be incorporated into electrophoretic displays. Alternatively, the dispersions may be useful for forming electrophotographic toners and dispersions for other printing applications.
    Type: Grant
    Filed: May 1, 2020
    Date of Patent: January 14, 2025
    Assignee: E Ink Corporation
    Inventors: Eugene Bzowej, John L Marshall, Stephen J. Telfer, Brandon Macdonald
  • Patent number: 12197099
    Abstract: A system for simplified driving of electrophoretic media using a positive and a negative voltage source, where the voltage sources have different magnitudes, and a controller that cycles the top electrode between the two voltage sources and ground while coordinating driving at least two drive electrodes opposed to the top electrode. The resulting system can achieve roughly the same color states as compared to supplying each drive electrode with six independent drive levels and ground. Thus, the system simplifies the required electronics with only marginal loss in color gamut. The system is particularly useful for addressing an electrophoretic medium including four sets of different particles, e.g., wherein three of the particles are colored and subtractive and one of the particles is light-scattering.
    Type: Grant
    Filed: October 31, 2023
    Date of Patent: January 14, 2025
    Assignee: E Ink Corporation
    Inventors: Stephen J. Telfer, Crystal Nguyen, Amit Deliwala, Kosta Ladavac, Christopher L. Hoogeboom
  • Patent number: 12189260
    Abstract: A multi-laver device and its method of manufacture are disclosed. The multi-layer device comprises a first electrode layer, a first repair layer, a functional layer, and a second electrode layer. The first repair layer comprises a conductive hydrogel film or conductive hydrogel beads, the conductive hydrogel film or the conductive hydrogel beads comprising conductive filler particles dispersed in a cross-linked polymer. The repair layer protects the multi-layer device from electrical short circuits. A multilayer device is also disclosed including a light-transmissive electrode layer comprising a porous mesh or porous spheres.
    Type: Grant
    Filed: November 29, 2022
    Date of Patent: January 7, 2025
    Assignee: E Ink Corporation
    Inventor: Nishit Murari
  • Patent number: 12186514
    Abstract: An active molecule delivery system whereby active molecules can be released on demand and/or a variety of different active molecules can be delivered from the same system and/or different concentrations of active molecules can be delivered from the same system. The invention is well-suited for delivering pharmaceuticals to patients transdermally. In some embodiments, the system includes two separate reservoirs and a mixing area thereby allowing precursors to be mixed immediately before transdermal delivery.
    Type: Grant
    Filed: October 26, 2022
    Date of Patent: January 7, 2025
    Assignee: E Ink Corporation
    Inventors: Richard J. Paolini, Jr., Stephen J. Telfer, Timothy J. O'Malley, Brian D. Bean
  • Patent number: 12190730
    Abstract: A parking space management system includes a bistable reflective display, such as an electrophoretic display, which is sunlight-readable and only requires power when the information on the display is updated. One or more detectors are configured to determine the presence of an object within a bounded space, such as a parking space, and communicate that status to the bistable reflective display, thereby causing the bistable reflective display to show the presence of an object within the bounded space to an observer. Such a system is easy to implement and will save drivers' time because they don't have to hunt for a parking spot. Such a system also reduces tailpipe emissions because it is not necessary to drive up and down multiple aisles of cars looking for an open parking spot.
    Type: Grant
    Filed: February 24, 2023
    Date of Patent: January 7, 2025
    Assignee: E Ink Corporation
    Inventors: Zhen Bao, George G. Harris, Brian D. Bean
  • Patent number: 12189259
    Abstract: An electrophoretic medium comprises a plurality of core-shell particles and a non-polar fluid. The core-shell particles comprise an organic pigment particles core and a shell comprising a metal oxide layer and a silane layer. The metal oxide layer may have a thickness of 0.4 to 2 nm. It may be formed using a fluidized bed reactor by inserting the organic pigment into the reactor as a powder bed, contacting the powder bed with a gaseous stream comprising a metal oxide precursor and an inert gas, and contacting the powder bed with a gaseous stream of a reagent and an inert gas. The silane layer is formed from a silane compound comprising a first functional group, wherein the first functional group reacts with the metal oxide.
    Type: Grant
    Filed: March 25, 2024
    Date of Patent: January 7, 2025
    Assignee: E Ink Corporation
    Inventors: Jay William Anseth, Brandon MacDonald, Craig Alan Breen
  • Patent number: 12190836
    Abstract: An electro-optic display including a first subpixel electrode and a second subpixel electrode associated with a display pixel, and an electrophoretic display medium disposed between a common electrode and the first and second subpixel electrodes. The electro-optic display also includes a display controller circuit in electrical communication with the common electrode and a first transistor associated with the display pixel. The display controller circuit is capable of applying waveforms to the display pixel by applying one or more time-dependent voltages between the common electrode and the first subpixel electrode via the first transistor, where the one or more time-dependent voltages are applied to the first subpixel electrode. The electro-optic display also includes a second transistor in electrical communication with the first subpixel electrode and the second subpixel electrode.
    Type: Grant
    Filed: January 23, 2024
    Date of Patent: January 7, 2025
    Assignee: E Ink Corporation
    Inventors: Timothy J. O'Malley, Karl Raymond Amundson, Chih-Hsiang Ho, Jonathan L. Zalesky, Yi Lu, Ian French
  • Patent number: 12181767
    Abstract: A color electrophoretic display with improved black optical state includes an electrophoretic medium having five types of charged electrophoretic pigment particles in a non-polar fluid: a first particle having a first optical property and first charge polarity; a second particle having a second optical property and second opposite charge polarity with a first charge magnitude; a third particle having a third optical property and second charge polarity with a second charge magnitude smaller than the first charge; a fourth particle having a fourth optical property and second charge polarity with a third charge magnitude smaller than the second charge; and a fifth particle having a fifth optical property and second charge polarity with a fourth charge magnitude greater than the first charge. The first and fifth particles are white and black, respectively, and the second, third, and fourth particles are each a different one of cyan, magenta, and yellow.
    Type: Grant
    Filed: June 17, 2024
    Date of Patent: December 31, 2024
    Assignee: E Ink Corporation
    Inventors: Stephen J. Telfer, Ziyan Wu, Sherry Hsin-Yi Tsai, Alex Cheng, Zhe Gong
  • Patent number: 12181766
    Abstract: The present invention provides for a method of rendering an image on a reflective display wherein each pixel is capable of rendering a limited number of colors, each of which is rendered by predetermined set of waveforms stored in a waveform lookup table. Furthermore, the present invention provides for a method for rendering an image using such colors, having been chosen for optimal color rendition. This invention further provides for rendering a color image formed from a plurality of pixels on a reflective display wherein each pixel has a color selected from the group consisting of at least: red, green, blue, cyan, magenta, yellow, black and white.
    Type: Grant
    Filed: October 31, 2023
    Date of Patent: December 31, 2024
    Assignee: E Ink Corporation
    Inventors: Alain Bouchard, Stephen J. Telfer
  • Patent number: 12181768
    Abstract: Light-transmissive conductors including oriented conductors disposed in a light-transmissive polymer having a volume resistivity between 1×1010 ohm-cm and 1×104 ohm-cm. The oriented conductors typically have very high conductivity along their length. Light-transmissive conductors described herein are well-suited for front electrodes for electro-optic displays, especially elongated displays in the shape of ribbons, stripes, or rulers.
    Type: Grant
    Filed: September 25, 2020
    Date of Patent: December 31, 2024
    Assignee: E Ink Corporation
    Inventors: Richard J. Paolini, Jr., Jay William Anseth