Patents by Inventor Stephane Vivien

Stephane Vivien 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).

  • Ambient light detection
    Patent number: 8878830
    Abstract: Ambient light is detected by a photodiode circuit by measuring the time taken for a digital output of the photodiode circuit to change state in response to exposure of a photodiode of the photodiode circuit to that ambient light. A nominal time for state change is calculated based on photodiode circuit characteristics. Furthermore, an effective time for the photodiode circuit digital output to change state is determined in a calibration mode where the photodiode has been disconnected and a reference current is applied to the circuit. An illumination value of the detected ambient light is then calculated as a function of: the measured time, the effective time and the nominal time.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: November 4, 2014
    Assignees: STMicroelectronics (Research & Development) Limited, STMicroelectronics SAS (Moroc), STMicroelectronics (Grenoble 2) SAS
    Inventors: Jeffrey Raynor, Abdelouahid Zakriti, Stephane Vivien, Pascal Mellot
  • AMBIENT LIGHT DETECTION
    Publication number: 20110141078
    Abstract: Ambient light is detected by a photodiode circuit by measuring the time taken for a digital output of the photodiode circuit to change state in response to exposure of a photodiode of the photodiode circuit to that ambient light. A nominal time for state change is calculated based on photodiode circuit characteristics. Furthermore, an effective time for the photodiode circuit digital output to change state is determined in a calibration mode where the photodiode has been disconnected and a reference current is applied to the circuit. An illumination value of the detected ambient light is then calculated as a function of: the measured time, the effective time and the nominal time.
    Type: Application
    Filed: September 17, 2010
    Publication date: June 16, 2011
    Applicants: STMicroelectronics (Research & Development) Limite, STMicroelectronics SAS (Moroc), STMicroelectronics (Grenoble 2) SAS
    Inventors: Jeffrey Raynor, Abdelouahid Zakriti, Stephane Vivien, Pascal Mellot