Patents by Inventor Philip S. DiPiazza

Philip S. DiPiazza 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).

  • Adaptive thresholding scheme for optically-based touch screens
    Patent number: 4707689
    Abstract: The sensitivity of an optically-based touch screen is substantially impro by adaptively establishing the detection threshold based on the peak trapped light measured over a number of frames on the screen being painted. In accordance with one feature of the invention, the peak trapped light from a target area painted on the screen is compared with a priorly established threshold as a way of determining that a target area is being touched by the user. In accordance with another feature of the invention, the threshold is modified in a way that compensates for possible erroneous touch indications due, for example, to bright spots on the screen.
    Type: Grant
    Filed: March 25, 1985
    Date of Patent: November 17, 1987
    Assignee: AT&T Information Systems Inc. American Telephone & Telegraph Company
    Inventors: Philip S. DiPiazza, Dale E. Lynn, Donald J. Weber