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).

  • METHOD OF MAKING ELECTROPHORETIC DISPERSION
    Publication number: 20160333185
    Abstract: The present invention is directed to methods of making an electrophoretic dispersion comprising pigment particles dispersed in a solvent or solvent mixture, wherein said pigment particles comprises at least one polymer chain comprising a terminal thiocarbonylthio group, attached to the particle surface. The invention also relates to pigment particles suitable for use in an electrophoretic dispersion and methods for their preparation through a RAFT polymerization technique.
    Type: Application
    Filed: August 1, 2016
    Publication date: November 17, 2016
    Applicant: E Ink California, LLC
    Inventors: Yu Li, Hui Du, Yayong Liu, Haiyan Gu, HongMei Zang
  • DRIVING METHODS AND CIRCUIT FOR BI-STABLE DISPLAYS
    Publication number: 20160335956
    Abstract: The disclosure is directed toward driving methods and a driving circuit which are particularly suitable for bi-stable displays. In certain embodiments, methods provide the fastest and most pleasing appearance to the desired image while maintaining the optimal image quality over the life expectancy of an electrophoretic display device.
    Type: Application
    Filed: May 6, 2016
    Publication date: November 17, 2016
    Inventors: Robert A. SPRAGUE, Andrew HO, Yajuan CHEN, HongMei ZANG, Jialock WONG, Chein WANG
  • MICROCUP COMPOSITIONS
    Publication number: 20160279072
    Abstract: The present invention is directed to a composition for preparing the microcups and the toughness of the display panel formed from such a composition may be significantly improved. In some cases, the panel may have an elongation at break of more than 10% and it can be completely peeled off from the substrate layer on which it is formed, without causing any damage to the panel.
    Type: Application
    Filed: June 8, 2016
    Publication date: September 29, 2016
    Inventors: Yu LI, HongMei ZANG
  • ELECTROPHORETIC FLUID
    Publication number: 20160266463
    Abstract: The present invention is directed to a display fluid comprising charged composite pigment particles dispersed in a solvent. The composite pigment particles have a density which matches to the density of the solvent in which they are dispersed. A display fluid comprising the composite pigment particles provides improved display performance.
    Type: Application
    Filed: May 25, 2016
    Publication date: September 15, 2016
    Inventors: Hui Du, Yu Li, Wei-Ho Ting, HongMei Zang, Ming Wang
  • Electrophoretic display film for anti-counterfeit application
    Patent number: 9436058
    Abstract: The present invention is directed to an electrophoretic display film which can be controlled to malfunction permanently within a period of time. It provides an elegant method to utilize an electrophoretic film for anti-counterfeit purposes. The concept involves the removal of strong barrier layer(s) from the film to allow the solvent in the electrophoretic fluid within the film to evaporate through weak barrier layer(s), and within a period of time, the performance of the display film will be significantly degraded and the film cannot be re-used.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: September 6, 2016
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Yu Li, HongMei Zang
  • Electrophoretic dispersion
    Patent number: 9428649
    Abstract: The present invention is directed to an electrophoretic dispersion comprising pigment particles dispersed in a solvent or solvent mixture, wherein said pigment particles comprises at least one polymer chain comprising a terminal thiocarbonylthio group, attached to the particle surface. The invention also relates to pigment particles suitable for use in an electrophoretic dispersion and methods for their preparation through a RAFT polymerization technique.
    Type: Grant
    Filed: November 2, 2011
    Date of Patent: August 30, 2016
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Yu Li, Hui Du, Yayong Liu, Haiyan Gu, HongMei Zang
  • Microcup compositions
    Patent number: 9388307
    Abstract: The present invention is directed to a composition for preparing the microcups and the toughness of the display panel formed from such a composition may be significantly improved. In some cases, the panel may have an elongation at break of more than 10% and it can be completely peeled off from the substrate layer on which it is formed, without causing any damage to the panel.
    Type: Grant
    Filed: November 27, 2012
    Date of Patent: July 12, 2016
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Yu Li, HongMei Zang
  • Driving methods and circuit for bi-stable displays
    Patent number: 9373289
    Abstract: The disclosure is directed toward driving methods and a driving circuit which are particularly suitable for bi-stable displays. In certain embodiments, methods provide the fastest and most pleasing appearance to the desired image while maintaining the optimal image quality over the life expectancy of an electrophoretic display device.
    Type: Grant
    Filed: August 28, 2012
    Date of Patent: June 21, 2016
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Robert Sprague, Andrew Ho, Yajuan Chen, Hongmei Zang, Jialock Wong, Chein Wang
  • Electrophoretic fluid
    Patent number: 9372380
    Abstract: The present invention is directed to a display fluid comprising charged composite pigment particles dispersed in a solvent. The composite pigment particles have a density which matches to the density of the solvent in which they are dispersed. A display fluid comprising the composite pigment particles provides improved display performance.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: June 21, 2016
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Hui Du, Yu Li, Wei-Ho Ting, HongMei Zang, Ming Wang
  • COLOR TUNING FOR ELECTROPHORETIC DISPLAY DEVICE
    Publication number: 20160170106
    Abstract: The present invention is directed to color tuning methods for electrophoretic display devices. For example, a color tuning agent may be added to a composition for forming a display cell structure or a primer layer. Alternatively, a separate color tuning layer may be added to a display device. Further, a color tuning agent may be added to an electrophoretic display fluid. The color tuning methods are useful for adjusting the color temperature of a display device.
    Type: Application
    Filed: February 10, 2016
    Publication date: June 16, 2016
    Inventors: Ming Wang, Hui Du, Craig Lin, Bryan Hans Chan, HongMei Zang
  • Electrophoretic fluid
    Patent number: 9366935
    Abstract: The present invention is directed to a display fluid comprising charged composite pigment particles dispersed in a solvent. The composite pigment particles have a density which matches to the density of the solvent in which they are dispersed. A display fluid comprising the composite pigment particles provides improved display performance.
    Type: Grant
    Filed: February 1, 2012
    Date of Patent: June 14, 2016
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Hui Du, Yu Li, Wei-Ho Ting, HongMei Zang
  • ADDITIVE PARTICLES FOR IMPROVING OPTICAL PERFORMANCE OF AN ELECTROPHORETIC DISPLAY
    Publication number: 20160139483
    Abstract: The present invention is directed to an electrophoretic fluid which comprises additive particles. The concentration of the additive particles in the electrophoretic fluid is 2.5% to 25% by weight and the additive particles are not seen at the viewing side during operation of the display. The resulting fluid can improve optical performance of a display device, such as image stability and contrast ratio. The present invention is also directed to an electrophoretic display comprising the electrophoretic fluid.
    Type: Application
    Filed: January 21, 2016
    Publication date: May 19, 2016
    Inventors: Ming Wang, Yu Li, Hui Du, Xiaojia Zhang, Haiyan Gu, Roman Ivanov, Robert A. Sprague, HongMei Zang
  • COLOR DISPLAY DEVICE
    Publication number: 20160116818
    Abstract: The present invention provides a realistic solution for a highlight or multicolor display device which can display high quality color states. More specifically, an electrophoretic fluid is provided which comprises four types of particles, having different levels of size, threshold voltage or charge intensity.
    Type: Application
    Filed: January 6, 2016
    Publication date: April 28, 2016
    Inventors: Hui DU, HongMei ZANG
  • Color display device
    Patent number: 9285649
    Abstract: The present invention provides a realistic solution for a highlight or multicolor display device which can display high quality color states. More specifically, an electrophoretic fluid is provided which comprises four types of particles, having different levels of size, threshold voltage or charge intensity.
    Type: Grant
    Filed: April 18, 2014
    Date of Patent: March 15, 2016
    Assignee: E INK CALIFORNIA, LLC
    Inventors: Hui Du, HongMei Zang
  • ELECTROPHORETIC DISPLAY FILM FOR ANTI-COUNTERFEIT APPLICATION
    Publication number: 20160004136
    Abstract: The present invention is directed to an electrophoretic display film which can be controlled to malfunction permanently within a period of time. It provides an elegant method to utilize an electrophoretic film for anti-counterfeit purposes. The concept involves the removal of strong barrier layer(s) from the film to allow the solvent in the electrophoretic fluid within the film to evaporate through weak barrier layer(s), and within a period of time, the performance of the display film will be significantly degraded and the film cannot be re-used.
    Type: Application
    Filed: September 11, 2015
    Publication date: January 7, 2016
    Inventors: Yu Li, HongMei Zang
  • ANISOTROPIC CONDUCTIVE DIELECTRIC LAYER FOR ELECTROPHORETIC DISPLAY
    Publication number: 20150378235
    Abstract: The present invention is directed to an electrophoretic display device comprising (a) microcells filled with an electrophoretic fluid, and (b) at least one dielectric layer which comprises at least two types of filler. Among the types of filler, at least one type is sensitive to a magnetic field.
    Type: Application
    Filed: June 24, 2015
    Publication date: December 31, 2015
    Inventors: Craig LIN, Yu Li, Peter B. Laxton, Lei Liu, Hui Du, HongMei Zang
  • ELECTROPHORETIC DISPLAY DEVICE
    Publication number: 20150378236
    Abstract: The present invention is directed to an electrophoretic display device which is suitable for passive matrix driving. The electrophoretic fluid may comprise two types of charged pigment particles wherein the two types of charged pigment particles carry opposite charge polarities, have contrasting colors and have different levels of charge intensity. Alternatively, there may be a third type of particles added to the fluid.
    Type: Application
    Filed: September 9, 2015
    Publication date: December 31, 2015
    Inventors: Ming Wang, Craig Lin, Hui Du, HongMei Zang, Xiaojia Zhang
  • Display
    Patent number: 9223164
    Abstract: A display includes a display medium layer and a dielectric layer disposed at a side of the display medium layer. The composition of the dielectric layer includes at least a humectant for decreasing the electric resistivity of the dielectric layer and stabilizing the electric performance of the display.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: December 29, 2015
    Assignee: SiPix Technology, Inc.
    Inventors: Cheng-Yuan Lai, Hui Chen, Jung-An Cheng, Wei-Ho Ting, Yu Li, Hongmei Zang, Ming Wang, Zoran Topalovic, Tyau-Jeen Lin
  • Electrophoretic display film for anti-counterfeit application
    Patent number: 9188829
    Abstract: The present invention is directed to an electrophoretic display film which can be controlled to malfunction permanently within a period of time. It provides an elegant method to utilize an electrophoretic film for anti-counterfeit purposes. The concept involves the removal of strong barrier layer(s) from the film to allow the solvent in the electrophoretic fluid within the film to evaporate through weak barrier layer(s), and within a period of time, the performance of the display film will be significantly degraded and the film cannot be re-used.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: November 17, 2015
    Assignee: E Ink California, LLC
    Inventors: Yu Li, HongMei Zang
  • Driving bistable displays
    Patent number: 9171508
    Abstract: The invention relates to waveforms, circuits and methods for driving bistable displays. The invention is directed to a method, comprising in combination: applying, across a bistable display device, a shaking signal comprising a plurality of positive and negative pulses each driven for a first time to disperse partially packed particles; applying, across the device, one or more first driving signals to first pixels of the device for second times that are sufficient to drive the first pixels to one or more reference states; and concurrently with the first driving signals, applying, across the device, one or more second driving signals to second pixels of the device for third times that are shorter than necessary to drive the second pixels to any of the one or more reference states.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: October 27, 2015
    Assignee: E Ink California, LLC
    Inventors: Robert A. Sprague, Wanheng Wang, Yajuan Chen, Andrew Ho, Bryan Hans Chan, Jialock Wong, HongMei Zang