Patents by Inventor Pramod K. Varma

Pramod K. Varma 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).

  • Charge pump for producing display driver output
    Patent number: 8884940
    Abstract: A system for driving an array of display elements includes a supply line, at least one capacitor, a plurality of drive lines and overdrive lines, a plurality of switches and a controller configured to activate and deactivate subsets of the switches in order to selectively couple the at least one capacitor to the drive lines and to the overdrive lines. A method for generating an overdrive voltage includes activating and deactivating a plurality of switches to couple a drive voltage line and/or an overdrive voltage line to at least one capacitor.
    Type: Grant
    Filed: January 6, 2010
    Date of Patent: November 11, 2014
    Assignee: QUALCOMM MEMS Technologies, Inc.
    Inventors: Wilhelmus Johannes Robertus Van Lier, Pramod K. Varma
  • System and method of updating drive scheme voltages
    Patent number: 8780104
    Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for calibrating display arrays. In one aspect, a method of calibrating a display array includes determining a particular drive response characteristic and updating a particular drive scheme voltage between updates of image data on the display array.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: July 15, 2014
    Assignee: Qualcomm MEMS Technologies, Inc.
    Inventors: Nao S. Chuei, Koorosh Aflatooni, Wilhelmus Johannes Robertus Van Lier, Pramod K. Varma, Ramesh K. Goel, Sameer Venugopal
  • SYSTEM AND METHOD OF SENSING ACTUATION AND RELEASE VOLTAGES OF INTERFEROMETRIC MODULATORS
    Publication number: 20130321380
    Abstract: This disclosure provides methods and apparatus for calibrating display arrays. In one aspect, a method of calibrating a display array includes determining a particular drive response characteristic and updating a particular drive scheme voltage between updates of image data on the display array. The drive response characteristic may be determined by applying a ramped voltage to a line of the array and detecting a current pulse due to a capacitance change on the line. The drive response characteristic can be determined based on data representing a width of a current pulse in the waveform or a weighted or unweighted area of a current pulse in the waveform.
    Type: Application
    Filed: March 7, 2013
    Publication date: December 5, 2013
    Applicant: QUALCOMM MEMS Technologies, Inc.
    Inventors: Nao S. Chuei, Wilhelmus Van Lier, Pramod K. Varma, Koorosh Aflatooni, William J. Cummings
  • SYSTEM AND METHOD OF SENSING ACTUATION AND RELEASE VOLTAGES OF INTERFEROMETRIC MODULATORS
    Publication number: 20130321379
    Abstract: This disclosure provides methods and apparatus for calibrating display arrays. In one aspect, a method of calibrating a display array includes determining a particular drive response characteristic and updating a particular drive scheme voltage between updates of image data on the display array. The drive response characteristic may be determined by applying a ramp voltage to a line of the array and detecting a current pulse due to a capacitance change on the line. The ramp voltage generator can include a capacitor and a digitally controlled current source.
    Type: Application
    Filed: February 1, 2013
    Publication date: December 5, 2013
    Applicant: QUALCOMM MEMS Technologies, Inc.
    Inventors: Wilhelmus Van Lier, Pramod K. Varma, Nao S. Chuei, Vladimir Radomirovic, Ramesh K. Goel
  • SYSTEM AND METHOD OF UPDATING DRIVE SCHEME VOLTAGES
    Publication number: 20120235985
    Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for calibrating display arrays. In one aspect, a method of calibrating a display array includes determining a particular drive response characteristic and updating a particular drive scheme voltage between updates of image data on the display array.
    Type: Application
    Filed: October 21, 2011
    Publication date: September 20, 2012
    Applicant: QUALCOMM MEMS Technologies, Inc.
    Inventors: Nao S. Chuei, Koorosh Aflatooni, Wilhelmus Johannes Robertus Van Lier, Pramod K. Varma, Ramesh K. Goel, Sameer Venugopal
  • CHARGE PUMP FOR PRODUCING DISPLAY DRIVER OUTPUT
    Publication number: 20110164009
    Abstract: A system for driving an array of display elements includes a supply line, at least one capacitor, a plurality of drive lines and overdrive lines, a plurality of switches and a controller configured to activate and deactivate subsets of the switches in order to selectively couple the at least one capacitor to the drive lines and to the overdrive lines. A method for generating an overdrive voltage includes activating and deactivating a plurality of switches to couple a drive voltage line and/or an overdrive voltage line to at least one capacitor.
    Type: Application
    Filed: January 6, 2010
    Publication date: July 7, 2011
    Applicant: QUALCOMM MEMS Technologies, Inc.
    Inventors: Wilhelmus Johannes Robertus Van Lier, Pramod K. Varma