Patents by Inventor John Van Den Homberg

John Van Den Homberg 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).

  • Active matrix display devices and methods of driving the same
    Patent number: 8780142
    Abstract: An active matrix display device has a column driver circuit for providing pixel drive signals to columns of pixels, and comprising current source circuits. Each current source circuit has a supply switch (78) for controlling the time during which the current source supplies current to or drains current from the column. A mapping means (74) derives from a pixel drive level a digital value which represents a time period for the control of the supply switch (78) of each current source circuit. The mapping means (74) implements a single mapping function for use in providing the digital values for all current source circuits. Having a current source circuit for each column facilitates the application of inversion patterns. The conversion of pixel drive levels to values representing time is carried out in a shared manner, so that the required area is kept to a minimum.
    Type: Grant
    Filed: February 27, 2006
    Date of Patent: July 15, 2014
    Assignee: Innolux Corporation
    Inventors: John Van Den Homberg, Hendrik J. Bergveld, Frans Schoofs
  • Active Matrix Display Devices and Methods of Driving the Same
    Publication number: 20080316163
    Abstract: An active matrix display device has a column driver circuit for providing pixel drive signals to columns of pixels, and comprising current source circuits. Each current source circuit has a supply switch (78) for controlling the time during which the current source supplies current to or drains current from the column. A mapping means (74) derives from a pixel drive level a digital value which represents a time period for the control of the supply switch (78) of each current source circuit. The mapping means (74) implements a single mapping function for use in providing the digital values for all current source circuits. Having a current source circuit for each column facilitates the application of inversion patterns. The conversion of pixel drive levels to values representing time is carried out in a shared manner, so that the required area is kept to a minimum.
    Type: Application
    Filed: February 27, 2006
    Publication date: December 25, 2008
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: John Van Den Homberg, Hendrik J. Bergveld, Frans Schoofs