Patents by Inventor Asami Machida

Asami Machida 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 of light emitting device and electronic apparatus
    Patent number: 7573445
    Abstract: A light emitting element deteriorates with time. Therefore, a method for reducing a lighting time is suggested to obtain a long life light emitting element. However, when the proportion (duty ratio) that a lighting time occupies per one horizontal scan period is reduced, the apparent luminance is also lowered. According to the invention, a light emitting element is controlled so that a light emitting period 205 and a non-light emitting period 206 are switched alternately at least once during a sustain period 203 in synchronism with a control signal. Thus, instantaneous lighting time can be reduced enough to reduce the duty ratio while maintaining the apparent luminance.
    Type: Grant
    Filed: December 10, 2003
    Date of Patent: August 11, 2009
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Asami Machida
  • Driving method of light emiting device and electronic apparatus
    Publication number: 20040246208
    Abstract: A light emitting element deteriorates with time. Therefore, a method for reducing a lighting time is suggested to obtain a long life light emitting element. However, when the proportion (duty ratio) that a lighting time occupies per one horizontal scan period is reduced, the apparent luminance is also lowered. According to the invention, a light emitting element is controlled so that a light emitting period 205 and a non-light emitting period 206 are switched alternately at least once during a sustain period 203 in synchronism with a control signal. Thus, instantaneous lighting time can be reduced enough to reduce the duty ratio while maintaining the apparent luminance.
    Type: Application
    Filed: December 10, 2003
    Publication date: December 9, 2004
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Asami Machida