Patents by Inventor Matsueda Yojiro

Matsueda Yojiro 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).

  • Photo sensor and flat panel display device using thereof
    Patent number: 8749537
    Abstract: A photo sensor that is capable of generating a photo sensing signal corresponding only to ambient light by comprehending changes in electrical current depending on the change of temperature and compensating for the electrical current according the change of temperature and a flat panel display device using the photo sensor, and the photo sensor including a photo sensing unit generating a first current corresponding to an ambient light and a second current corresponding to an ambient temperature; a temperature compensating unit including a dark diode generating a third current having a same magnitude as the second current, corresponding to the ambient temperature due to block of light to be incident; and a buffer unit outputting a light sensing signal corresponding to current having the same magnitude as the first current by subtracting the third current generated in the temperature compensating unit from the second current generated in the photo sensing unit.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: June 10, 2014
    Assignee: Samsung Display Co., Ltd.
    Inventors: Do-Youb Kim, Matsueda Yojiro, Keum-Nam Kim
  • Photo sensor and flat panel display device using thereof
    Publication number: 20090201228
    Abstract: A photo sensor that is capable of generating a photo sensing signal corresponding only to ambient light by comprehending changes in electrical current depending on the change of temperature and compensating for the electrical current according the change of temperature and a flat panel display device using the photo sensor, and the photo sensor including a photo sensing unit generating a first current corresponding to an ambient light and a second current corresponding to an ambient temperature; a temperature compensating unit including a dark diode generating a third current having a same magnitude as the second current, corresponding to the ambient temperature due to block of light to be incident; and a buffer unit outputting a light sensing signal corresponding to current having the same magnitude as the first current by subtracting the third current generated in the temperature compensating unit from the second current generated in the photo sensing unit.
    Type: Application
    Filed: February 13, 2009
    Publication date: August 13, 2009
    Inventors: Do-Youb Kim, Matsueda Yojiro, Keum-Nam Kim