Patents by Inventor Tarou Kimura

Tarou Kimura 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).

  • Constant-current drive circuit
    Patent number: 8008870
    Abstract: A voltage supplied from a power supply is boosted by a boosting circuit unit to generate a direct-current voltage, and the pulse-shape direct-current voltage is applied to LED while a constant-voltage control unit controls the direct-current voltage. The operation of LED is controlled by a control unit and a PWM unit. When the current is passed through LED, the constant-voltage control unit obtains information on the current passed through LED from a potential difference between both ends of a resistor, and on-and-off control of the voltage applied to LED from the boosting circuit unit is performed at a high frequency based on the information. Therefore, the voltage applied to LED can be controlled to keep the current passed through LED constant.
    Type: Grant
    Filed: February 15, 2007
    Date of Patent: August 30, 2011
    Assignee: NEC Display Solutions, Ltd.
    Inventor: Tarou Kimura
  • Constant-current drive circuit
    Publication number: 20080198884
    Abstract: A voltage supplied from a power supply is boosted by a boosting circuit unit to generate a direct-current voltage, and the pulse-shape direct-current voltage is applied to LED while a constant-voltage control unit controls the direct-current voltage. The operation of LED is controlled by a control unit and a PWM unit. When the current is passed through LED, the constant-voltage control unit obtains information on the current passed through LED from a potential difference between both ends of a resistor, and on-and-off control of the voltage applied to LED from the boosting circuit unit is performed at a high frequency based on the information. Therefore, the voltage applied to LED can be controlled to keep the current passed through LED constant.
    Type: Application
    Filed: February 15, 2007
    Publication date: August 21, 2008
    Applicant: NEC Display Solutions, Ltd.
    Inventor: Tarou Kimura