Patents by Inventor Hongxi Zhou

Hongxi Zhou 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).

  • Multistable cholesteric liquid crystal devices driven by width-dependent voltage pulse
    Patent number: 5889566
    Abstract: A light modulating apparatus containing cholesteric liquid crystals capable of indefinite zero field retention of optical images, including full color and complete gray scale capability, is described. This invention is predicated on establishment of zero field multistable liquid crystal domains representing a continuous distribution of states ranging from the highly reflective planar to the light-scattering focal-conic structures. The zero field multistable domain structure stability is achieved by controlling solid surface-liquid crystal boundary interactions to provide essential equalization of the total system energy of each of the domain structures. This is the first time this equalization, and thus zero field multistability, has been achieved without the use of a polymer gel addition to create rigid polydomains in the liquid crystal mix.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: March 30, 1999
    Assignee: Advanced Display Systems, Inc.
    Inventors: Bao-Gang Wu, Jianmi Gao, Hongxi Zhou, Yao-Dong Ma
  • Ultra fast response, multistable reflective cholesteric liquid crystal displays
    Patent number: 5661533
    Abstract: Surfactant-containing multistable cholesteric liquid crystal displays exhibit ultra fast response times with both video speed and gray scale capability.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: August 26, 1997
    Assignee: Advanced Display Systems, Inc.
    Inventors: Bao-Gang Wu, Hongxi Zhou, Yao-Dong Ma
  • Zero field multistable cholesteric liquid crystal displays
    Patent number: 5625477
    Abstract: A light modulating apparatus containing cholesteric liquid crystals capable of indefinite zero field retention of optical images, including full color and complete gray scale capability, is described. This invention is predicated on establishment of zero field multistable liquid crystal domains representing a continuous distribution of states ranging from the highly reflective planar to the light-scattering focal-conic structures. The zero field multistable domain structure stability is achieved by controlling solid surface-liquid crystal boundary interactions to provide essential equalization of the total system energy of each of the domain structures. This is the first time this equalization, and thus zero field multistability, has been achieved without the use of a polymer gel addition to create rigid polydomains in the liquid crystal mix.
    Type: Grant
    Filed: April 11, 1994
    Date of Patent: April 29, 1997
    Assignee: Advanced Display Systems, Inc.
    Inventors: Bao-Gang Wu, Jianmi Gao, Hongxi Zhou, Yao-Dong Ma