Patents by Inventor David SERNELIUS

David SERNELIUS 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).

  • TIR-based optical touch systems of projection-type
    Patent number: 10365768
    Abstract: A touch-sensitive apparatus operates by light frustration (FTIR) and comprises a light transmissive panel (1) that defines a front surface (5) and a rear surface (6), light emitters optically connected to the panel (1) so as to generate light that propagates by total internal reflection inside the panel, and light detectors (3) optically connected to the panel (1) so as to define a grid of propagation paths inside the panel (1) between pairs of light emitters and light detectors (3). Each light detector (3) is optically connected to the panel (1) via an angular filter (20). The filter (20) is applied to an outcoupling region on at least one of the front and rear surfaces (5, 6) and is configured to transmit light only within a confined range of angles with respect to the normal of the outcoupling region. The confined range extends from a lower angle limit ?min to an upper angle limit ?max.
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: July 30, 2019
    Assignee: FlatFrog Laboratories AB
    Inventors: Thomas Craven-Bartle, Håkan Bergström, Ivan Karlsson, Ola Wassvik, David Sernelius
  • IMPROVEMENTS IN TIR-BASED OPTICAL TOUCH SYSTEMS OF PROJECTION-TYPE
    Publication number: 20150331546
    Abstract: A touch-sensitive apparatus operates by light frustration (FTIR) and comprises a light transmissive panel (1) that defines a front surface (5) and a rear surface (6), light emitters optically connected to the panel (1) so as to generate light that propagates by total internal reflection inside the panel, and light detectors (3) optically connected to the panel (1) so as to define a grid of propagation paths inside the panel (1) between pairs of light emitters and light detectors (3). Each light detector (3) is optically connected to the panel (1) via an angular filter (20). The filter (20) is applied to an outcoupling region on at least one of the front and rear surfaces (5, 6) and is configured to transmit light only within a confined range of angles with respect to the normal of the outcoupling region. The confined range extends from a lower angle limit ?min to an upper angle limit ?max.
    Type: Application
    Filed: December 17, 2013
    Publication date: November 19, 2015
    Inventors: Thomas CRAVEN-BARTLE, Håkan BERGSTRÖM, Ivan KARLSSON, Ola WASSVIK, David SERNELIUS