Patents by Inventor Xing-Jie Yu

Xing-Jie Yu 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).

  • Retardation films having single retardation value with variation
    Patent number: 7969543
    Abstract: This invention pertains to the design and construction of retardation films (or plates) with any targeted dispersive property, including those with no wavelength dependence for the entire visible range. In particular, this invention deals with specific design of films with broadband (achromatic) quarterwave and halfwave retardation.
    Type: Grant
    Filed: January 11, 2007
    Date of Patent: June 28, 2011
    Assignee: The Hong Kong University of Science and Technology
    Inventors: Hoi-Sing Kwok, Xing-Jie Yu
  • Bistable liquid crystal device
    Patent number: 7557884
    Abstract: This invention provides a bistable liquid crystal device. The bistable liquid crystal device includes a first substrate having thereon a first conductive layer and a first alignment layer; a second substrate having thereon a second conductive layer and a second alignment layer; and a liquid crystal layer sandwiched between the first and second alignment layers. The first alignment layer induces a first pretilt angle ?1 in the range of 20°-65° between the liquid crystal layer in contact with the first alignment layer. The second alignment layer induces a second pretilt angle ?2 in the range of 20°-65° between the liquid crystal layer in contact with the second alignment layer. The liquid crystal layer is capable of maintaining a stable bend state or a stable splay state at zero bias voltage and is switchable between the stable bend state and the stable splay state when a switching energy is applied in operation to the liquid crystal layer.
    Type: Grant
    Filed: October 18, 2004
    Date of Patent: July 7, 2009
    Assignee: Hong Kong University of Science and Technology
    Inventors: Hoi-Sing Kwok, Xing Jie Yu
  • Retardation films
    Publication number: 20070159582
    Abstract: This invention pertains to the design and construction of retardation films (or plates) with any targeted dispersive property, including those with no wavelength dependence for the entire visible range. In particular, this invention deals with specific design of films with broadband (achromatic) quarterwave and halfwave retardation.
    Type: Application
    Filed: January 11, 2007
    Publication date: July 12, 2007
    Inventors: Hoi-Sing Kwok, Xing-Jie Yu
  • Color twisted nematic liquid crystal displays
    Patent number: 7236219
    Abstract: The present invention relates to color liquid crystal displays without the use of color filters. By carefully choosing the design parameters of a liquid crystal display, it is possible to obtain vivid colors from the display as a function of the operating voltage.
    Type: Grant
    Filed: November 28, 2003
    Date of Patent: June 26, 2007
    Assignee: The Hong Kong University of Science and Technology
    Inventors: Hoi-Sing Kwok, Xing-Jie Yu
  • Color vertically aligned liquid crystal displays
    Patent number: 6919947
    Abstract: The present invention relates to color liquid crystal displays without the use of color filters. By using vertically aligned liquid crystal display cells, it is possible to obtain vivid colors from the display as a function of the operating voltage, with a bright background that can be gray or colored.
    Type: Grant
    Filed: November 28, 2003
    Date of Patent: July 19, 2005
    Assignee: The Hong Kong University of Science and Technology
    Inventors: Hoi-Sing Kwok, Xing-Jie Yu
  • COLOR VERTICALLY ALIGNED LIQUID CRYSTAL DISPLAYS
    Publication number: 20050117101
    Abstract: The present invention relates to color liquid crystal displays without the use of color filters. By using vertically aligned liquid crystal display cells, it is possible to obtain vivid colors from the display as a function of the operating voltage, with a bright background that can be gray or colored.
    Type: Application
    Filed: November 28, 2003
    Publication date: June 2, 2005
    Applicant: The Hong Kong University of Science and Technology
    Inventors: Hoi-Sing Kwok, Xing-Jie Yu
  • Color twisted nematic liquid crystal displays
    Publication number: 20050117091
    Abstract: The present invention relates to color liquid crystal displays without the use of color filters. By carefully choosing the design parameters of a liquid crystal display, it is possible to obtain vivid colors from the display as a function of the operating voltage.
    Type: Application
    Filed: November 28, 2003
    Publication date: June 2, 2005
    Applicant: The Hong Kong University of Science and Technology
    Inventors: Hoi-Sing Kwok, Xing-Jie Yu