Patents by Inventor Toshiyuki Yana

Toshiyuki Yana 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).

  • Power supply and reference voltage circuit for TFT LCD source driver
    Patent number: 6963323
    Abstract: A liquid crystal power supply is provided which generates a high-precision drive power supply voltage supplied to a driver circuit by using a low-precision reference voltage generating circuit. The power supply circuit includes a DC/DC converter which generates a voltage having a size based on an oscillation signal from a power supply voltage and outputs the generated voltage as a drive power supply voltage; a stabilized power supply circuit which generates a highest-level reference potential for generating a gray-scale voltage in a driver circuit; a comparison unit which outputs a difference voltage according to a difference between the drive power supply voltage and the highest-level reference potential; an internal reference voltage generating unit; an error amplifying unit which amplifies a difference between the reference voltage and the difference voltage; and a PWM conversion unit which outputs an oscillation signal in response to the amplified difference.
    Type: Grant
    Filed: May 24, 2002
    Date of Patent: November 8, 2005
    Assignee: International Business Machines Corporation
    Inventors: Takaaki Sakurai, Yoshiteru Watanabe, Toshiyuki Yana, Satoshi Karube
  • Power supply and reference voltage circuit for TFT LCD source driver
    Publication number: 20020175662
    Abstract: A liquid crystal power supply is provided which generates a high-precision drive power supply voltage supplied to a driver circuit by using a low-precision reference voltage generating circuit. The power supply circuit includes a DC/DC converter which generates a voltage having a size based on an oscillation signal from a power supply voltage and outputs the generated voltage as a drive power supply voltage; a stabilized power supply circuit which generates a highest-level reference potential for generating a gray-scale voltage in a driver circuit; a comparison unit which outputs a difference voltage according to a difference between the drive power supply voltage and the highest-level reference potential; an internal reference voltage generating unit; an error amplifying unit which amplifies a difference between the reference voltage and the difference voltage; and a PWM conversion unit which outputs an oscillation signal in response to the amplified difference.
    Type: Application
    Filed: May 24, 2002
    Publication date: November 28, 2002
    Applicant: International Business Machines Corporation
    Inventors: Takaaki Sakurai, Yoshiteru Watanabe, Toshiyuki Yana, Satoshi Karube