Patents by Inventor Hongmei Zang

Hongmei Zang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11892740
    Abstract: Provided herein is an electro-optic display having a layer of electrophoretic material, a first conductive layer, and a piezoelectric material positioned between the layer of electrophoretic material and the first conductive layer, the piezoelectric material overlaps with a portion of the layer of electrophoretic material, and a portion of the first conductive layer overlaps with the rest of the electrophoretic material.
    Type: Grant
    Filed: October 20, 2021
    Date of Patent: February 6, 2024
    Assignee: E Ink Corporation
    Inventors: Haiyan Gu, Hongmei Zang, Craig Lin, Abraham Berhane
  • Publication number: 20230273495
    Abstract: Low-profile piezo-electrophoretic films and display films including low profile piezo-electrophoretic films. In some embodiments, the piezoelectric material of the piezo-electrophoretic films can be patterned with high-voltage electric fields after fabrication of the piezo-electrophoretic films. Such films are useful as security markers, authentication films, or sensors. The films are generally flexible. Some films are less than 100 ?m in thickness. Displays formed from the films do not require an external power source.
    Type: Application
    Filed: February 21, 2023
    Publication date: August 31, 2023
    Inventors: Haiyan GU, Yuriy Borisovich MATUS, Bryan Hans CHAN, HongMei ZANG, Donald A. SCHULTZ, Craig LIN
  • Patent number: 11719953
    Abstract: A method for collimating light using a film including elongated chambers of bistable electrophoretic fluids. The light-collimating films are suitable to control the amount and/or direction of light incident to a transmissive substrate. Such films may be integrated into devices, such as LCD displays, to provide a zone of privacy for a user viewing the LCD display. Because the light-collimating film is switchable, it allows a user to alter the collimation of the emitted light on demand. Because the films are bistable, they do not require additional power after they have been switched to a display state.
    Type: Grant
    Filed: March 23, 2022
    Date of Patent: August 8, 2023
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Xiaolong Zheng, Pubudu Thilanka Galwaduge, Craig Lin, Yih-Ming Kang, HongMei Zang, Hui Du
  • Patent number: 11656526
    Abstract: A switchable light-collimating film can be used as a privacy filter for computer monitors or other display devices. The film comprises a plurality of elongated chambers having pigment particles, the position of which can be controlled by the applied electric field. Distribution of the pigment particles throughout the elongated chambers, as opposed to their concentration on one side of the chambers, narrows the viewing angle to the light passing through the film and provides privacy of the viewing images to the user.
    Type: Grant
    Filed: June 17, 2022
    Date of Patent: May 23, 2023
    Assignee: E Ink California, LLC
    Inventors: Craig Lin, Xiaolong Zheng, Yih-Ming Kang, HongMei Zang
  • Publication number: 20230080781
    Abstract: A light-collimating film including elongated chambers of bistable electrophoretic fluids. The light-collimating films are suitable to control the amount and/or direction of light incident to a transmissive substrate. Such films may be integrated into devices, such as LCD displays, to provide a zone of privacy for a user viewing the LCD display. Because the light-collimating film is switchable, it allows a user to alter the collimation of the emitted light on demand. Because the films are bistable, they do not require additional power after they have been switched to a display state.
    Type: Application
    Filed: September 12, 2022
    Publication date: March 16, 2023
    Inventors: Xiaolong ZHENG, HongMei ZANG, Yih-Ming KANG, Stephen J. TELFER
  • Publication number: 20230014009
    Abstract: A benefit agent delivery system can deliver benefit agents on demand. The benefit agent delivery system comprises a first electrode layer, a microcell layer comprising a plurality of microcells, and a porous second electrode layer. Each of the plurality of microcells are filled with a liquid mixture comprising reverse micelles in a hydrophobic liquid that are formed from a polar liquid, a surfactant or stabilizing particles, and a benefit agent. Application of an electric field across a microcell layer causes an increase in the rate of release of the benefit agent of the microcell through the porous second electrode layer.
    Type: Application
    Filed: June 28, 2022
    Publication date: January 19, 2023
    Inventors: Madhuvanthi Agaram KANDADAI, HongMei ZANG
  • Publication number: 20230001188
    Abstract: A benefit agent delivery system can deliver benefit agents on demand. The benefit agent delivery system comprises a first electrode layer, a microcell layer comprising a plurality of microcells, and a porous second electrode layer. Each microcell of the plurality of microcells are filled with a liquid mixture comprising reverse micelles in a hydrophobic liquid that are formed from a polar liquid, an ionic surfactant, and a benefit agent. Application of an electric field on the microcell layer affects the rate of release of the benefit agent through the porous second electrode layer.
    Type: Application
    Filed: June 29, 2022
    Publication date: January 5, 2023
    Inventors: Madhuvanthi Agaram KANDADAI, HongMei ZANG
  • Patent number: 11543725
    Abstract: The present invention is directed to a flexible controlled release film for delivering a medicinal or cosmetic agent, e.g., through the skin of a subject, which delivery system comprises (a) a microembossed flexible film including microcells; (b) a liquid composition filled in the microcells wherein said liquid composition comprises the medicinal or cosmetic agent; and (c) a flexible sealing layer to enclose the liquid composition within the microcells.
    Type: Grant
    Filed: May 24, 2019
    Date of Patent: January 3, 2023
    Assignee: E INK CALIFORNIA, LLC
    Inventor: HongMei Zang
  • Patent number: 11493821
    Abstract: A writing apparatus including a first electrode, a layer of piezoelectric material; and a layer of electrophoretic material positioned between the first electrode and the layer of piezoelectric material, wherein stress on the layer of piezoelectric material results in optical changes in the layer of electrophoretic material.
    Type: Grant
    Filed: August 13, 2019
    Date of Patent: November 8, 2022
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Haiyan Gu, Hanan Liu, HongMei Zang
  • Publication number: 20220317541
    Abstract: A switchable light-collimating film can be used as a privacy filter for computer monitors or other display devices. The film comprises a plurality of elongated chambers having pigment particles, the position of which can be controlled by the applied electric field. Distribution of the pigment particles throughout the elongated chambers, as opposed to their concentration on one side of the chambers, narrows the viewing angle to the light passing through the film and provides privacy of the viewing images to the user.
    Type: Application
    Filed: June 17, 2022
    Publication date: October 6, 2022
    Inventors: Craig LIN, Xiaolong ZHENG, Yih-Ming KANG, HongMei ZANG
  • Patent number: 11397366
    Abstract: A switchable light-collimating film can be used as a privacy filter for computer monitors or other display devices. The film comprises a plurality of elongated chambers having pigment particles, the position of which can be controlled by the applied electric field. Distribution of the pigment particles throughout the elongated chambers, as opposed to their concentration on one side of the chambers, narrows the viewing angle to the light passing through the film and provides privacy of the viewing images to the user.
    Type: Grant
    Filed: July 26, 2019
    Date of Patent: July 26, 2022
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Craig Lin, Xiaolong Zheng, Yih-Ming Kang, HongMei Zang
  • Publication number: 20220221731
    Abstract: A method for collimating light using a film including elongated chambers of bistable electrophoretic fluids. The light-collimating films are suitable to control the amount and/or direction of light incident to a transmissive substrate. Such films may be integrated into devices, such as LCD displays, to provide a zone of privacy for a user viewing the LCD display. Because the light-collimating film is switchable, it allows a user to alter the collimation of the emitted light on demand. Because the films are bistable, they do not require additional power after they have been switched to a display state.
    Type: Application
    Filed: March 23, 2022
    Publication date: July 14, 2022
    Inventors: Xiaolong ZHENG, Pubudu Thilanka Galwaduge, Craig Lin, Yih-Ming Kang, HongMei Zang, Hui Du
  • Patent number: 11372305
    Abstract: The present invention is directed to an electrophoretic display device comprising microcells filled with an electrophoretic fluid and a dielectric layer, which comprises a first type of magnetic filler material, a second type of nonmagnetic filler material, and a polymeric material. The first and second types of filler material physically interact with each other and they are fixed and aligned in the dielectric adhesive layer in a direction perpendicular to a plane of the dielectric layer. The dielectric layer exhibits anisotropic conductivity having higher conductivity in the z direction compared to the other two orthogonal directions.
    Type: Grant
    Filed: February 28, 2020
    Date of Patent: June 28, 2022
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Craig Lin, Yu Li, Peter B. Laxton, Lei Liu, Hui Du, HongMei Zang
  • Patent number: 11314098
    Abstract: A light-collimating film including elongated chambers of bistable electrophoretic fluids. The light-collimating films are suitable to control the amount and/or direction of light incident to a transmissive substrate. Such films may be integrated into devices, such as LCD displays, to provide a zone of privacy for a user viewing the LCD display. Because the light-collimating film is switchable, it allows a user to alter the collimation of the emitted light on demand. Because the films are bistable, they do not require additional power after they have been switched to a display state.
    Type: Grant
    Filed: August 9, 2019
    Date of Patent: April 26, 2022
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Xiaolong Zheng, Pubudu Thilanka Galwaduge, Craig Lin, Yih-Ming Kang, HongMei Zang, Hui Du
  • Publication number: 20220035219
    Abstract: Provided herein is an electro-optic display having a layer of electrophoretic material, a first conductive layer, and a piezoelectric material positioned between the layer of electrophoretic material and the first conductive layer, the piezoelectric material overlaps with a portion of the layer of electrophoretic material, and a portion of the first conductive layer overlaps with the rest of the electrophoretic material.
    Type: Application
    Filed: October 20, 2021
    Publication date: February 3, 2022
    Inventors: Haiyan GU, HongMei ZANG, Craig LIN, Abraham BERHANE
  • Patent number: 11217145
    Abstract: The present invention is directed to driving methods for a color display device which can display high quality color states. The display device utilizes an electrophoretic fluid which comprises three types of pigment particles having different optical characteristics, and provides for displaying at a viewing surface not only the colors of the three types of particles but also the colors of binary mixtures thereof.
    Type: Grant
    Filed: June 19, 2020
    Date of Patent: January 4, 2022
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Craig Lin, Jo-Cheng Huang, Heng-Che Chen, Peter B. Laxton, Ming Wang, Ping-Yueh Cheng, HongMei Zang
  • Patent number: 11181799
    Abstract: Provided herein is an electro-optic display having a layer of electrophoretic material, a first conductive layer, and a piezoelectric material positioned between the layer of electrophoretic material and the first conductive layer, the piezoelectric material overlaps with a portion of the layer of electrophoretic material, and a portion of the first conductive layer overlaps with the rest of the electrophoretic material.
    Type: Grant
    Filed: May 17, 2019
    Date of Patent: November 23, 2021
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Haiyan Gu, HongMei Zang, Craig Lin, Abraham Berhane
  • Patent number: 11004409
    Abstract: The present invention is directed to driving methods for a color display device which can display high quality color states. The display device utilizes an electrophoretic fluid which comprises three types of pigment particles having different optical characteristics.
    Type: Grant
    Filed: May 17, 2019
    Date of Patent: May 11, 2021
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Craig Lin, Jo-Cheng Huang, Heng-Che Chen, Peter B. Laxton, Ming Wang, Ping-Yueh Cheng, HongMei Zang
  • Publication number: 20200320921
    Abstract: The present invention is directed to driving methods for a color display device which can display high quality color states. The display device utilizes an electrophoretic fluid which comprises three types of pigment particles having different optical characteristics, and provides for displaying at a viewing surface not only the colors of the three types of particles but also the colors of binary mixtures thereof.
    Type: Application
    Filed: June 19, 2020
    Publication date: October 8, 2020
    Inventors: Craig Lin, Jo-Cheng Huang, Heng-Che Chen, Peter B. Laxton, Ming Wang, Ping-Yueh Cheng, HongMei Zang
  • Patent number: 10762857
    Abstract: An electrophoretic display including a passive matrix formed of row and column electrodes with an electrophoretic medium including two types of differently-colored charged particles disposed between the row and column electrodes. When the device is driven to a first color state by providing a voltage differential of 15V, the color state is stable for voltage differentials between 15V and ?5V. The display switches to the second color state when a voltage differential of ?15V is provided.
    Type: Grant
    Filed: November 18, 2019
    Date of Patent: September 1, 2020
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Ming Wang, Craig Lin, Hui Du, HongMei Zang, XiaoJia Zhang