Patents by Inventor James Steven Edgar

James Steven Edgar 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).

  • PIXEL CAPACITANCE MEASUREMENT
    Publication number: 20170084233
    Abstract: This disclosure provides systems, methods and apparatus for a capacitance measurement circuit. In one aspect, a circuit can inject charge onto an electrode of a display unit of a display. The circuit can also transfer charge from the electrode to a capacitor to generate a voltage corresponding to a capacitance between the electrode and another electrode of the display unit.
    Type: Application
    Filed: September 22, 2015
    Publication date: March 23, 2017
    Inventors: Edward Keat Leem Chan, Bing Wen, James Steven Edgar, Robert Steven Kawamoto, Robert Anderson Beckman
  • Closed loop dynamic capacitance measurement
    Patent number: 9360511
    Abstract: This disclosure provides systems, methods and apparatus for measuring capacitance of a display unit, such as an interferometric modulator (IMOD). In one example, a circuit may include an operational amplifier (op-amp), a voltage controlled current source, and feedback from an output of the op-amp as an input to the voltage controlled current source. An output of the voltage controlled current source may be provided to a display unit as well as an input of the op-amp. A second input of the op-amp may be provided a ramping reference voltage.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: June 7, 2016
    Assignee: QUALCOMM MEMS Technologies, Inc.
    Inventors: Wilhelmus Johannes Robertus Van Lier, Robert Steven Kawamoto, James Steven Edgar, Pramod Kumar Varma
  • CLOSED LOOP DYNAMIC CAPACITANCE MEASUREMENT
    Publication number: 20150108986
    Abstract: This disclosure provides systems, methods and apparatus for measuring capacitance of a display unit, such as an interferometric modulator (IMOD). In one example, a circuit may include an operational amplifier (op-amp), a voltage controlled current source, and feedback from an output of the op-amp as an input to the voltage controlled current source. An output of the voltage controlled current source may be provided to a display unit as well as an input of the op-amp. A second input of the op-amp may be provided a ramping reference voltage.
    Type: Application
    Filed: April 4, 2014
    Publication date: April 23, 2015
    Applicant: QUALCOMM MEMS Technologies, Inc.
    Inventors: Wilhelmus Johannes Robertus Van Lier, Robert Steven Kawamoto, James Steven Edgar, Pramod Kumar Varma