Patents by Inventor Kouichi Koga

Kouichi Koga 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).

  • Driving method and driving circuit for color liquid crystal display
    Patent number: 7671829
    Abstract: A driving method for a color liquid crystal display which drives the color liquid crystal display based on a video red signal, a video green signal and a video blue signal by independently applying a gamma compensation to a clamped video red signal, a clamped video green signal and a clamped video blue signal in gamma compensating circuits in order to make suitable to a red transmittance characteristic, a green transmittance characteristic and a blue transmittance characteristic. With this operation, it is possible to carry out an optimal gamma compensation suitable to a characteristic of the color liquid crystal display and to remove a gradation batter occurring in a specific color.
    Type: Grant
    Filed: October 5, 2005
    Date of Patent: March 2, 2010
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Noriaki Sugawara, Kouichi Koga
  • Driving method and driving circuit for color liquid crystal display
    Publication number: 20060071894
    Abstract: A driving method for a color liquid crystal display which drives the color liquid crystal display based on a video red signal, a video green signal and a video blue signal by independently applying a gamma compensation to a clamped video red signal, a clamped video green signal and a clamped video blue signal in gamma compensating circuits in order to make suitable to a red transmittance characteristic, a green transmittance characteristic and a blue transmittance characteristic. With this operation, it is possible to carry out an optimal gamma compensation suitable to a characteristic of the color liquid crystal display and to remove a gradation batter occurring in a specific color.
    Type: Application
    Filed: October 5, 2005
    Publication date: April 6, 2006
    Inventors: Noriaki Sugawara, Kouichi Koga
  • Gamma compensation method and circuit for color liquid crystal display
    Patent number: 7006065
    Abstract: A driving method for a color liquid crystal display which drives the color liquid crystal display based on a video red signal, a video green signal and a video blue signal by independently applying a gamma compensation to a clamped video red signal, a clamped video green signal and a clamped video blue signal in gamma compensating circuits in order to make suitable to a red transmittance characteristic, a green transmittance characteristic and a blue transmittance characteristic. With this operation, it is possible to carry out an optimal gamma compensation suitable to a characteristic of the color liquid crystal display and to remove a gradation batter occurring in a specific color.
    Type: Grant
    Filed: November 7, 2000
    Date of Patent: February 28, 2006
    Assignee: NEC LCD Technologies, Ltd.
    Inventors: Noriaki Sugawara, Kouichi Koga